csc 326 manual

CSC-326 Numerical Transformer

Protection Equipment Manual

CAUTION

1) This manual applies only to CSC-326.2) Please read the manual carefully and the specification of the installation,

adjustment, testing, operation and maintenance with the device.3) To prevent damage from equipment, don’t plug-hot-plug any unit of the

equipment, touching the chips and components in printed circuit board is inhibited.4) Please use the testing instruments which comply with the relevant standards for

test and detection.5) If any abnormity occurred in the equipment or unusual maintenance needed,

promptly contact with the agents or our service hotline.6) The operation password is: 8888.

WARNING

1) During operation of electrical equipment, certain parts of this equipment are under high voltage. Severe personal injury or significant equipment damage could result from improper behavior.2) Only qualified personnel should work on this equipment or in vicinity of the equipment. These persons must be familiar with warning & service procedure described in this manual, as well as with safety regulations.3) Prerequisites to proper & safety operation of the equipment are proper storage, setup, installation, operation & maintenance of the equipment.4) In particularly cases, the general rules & safety regulations according to relating standards (e.g. IEC, National standards or other International standards) for work with high voltage equipment must be observed.

COPYRIGHT

All rights reserved.

Registered trademark

® are registered trademark of Beijing Sifang Automation Co., Ltd..

CONTENTS

1. Introduction…………………………………………………………………..…………………….1

1.1 Application…………………………………………………………….…………..………………..1

1.2 Features…………………………………………………………………….………………………...2

1.3 Functions……………………………………………………………………………………………….3

2. Design………………………………...………………………………………………………………..4

2.1 Mechanical structure………………………………………………………………………….4

2.2 Dimensions………………………………………………………..…………………………………5

3. Technical data…………………………………………………..………………………………...6

3.1 General data……………………………………………………………………..………………….6

3.2 Function data……………………………………………………………………………………….9

3.2.1 Differential protection unit data………………………………………………………9

3.2.2 Restricted earth fault protection unit data…………..……………………….9

3.2.3 Overflux protection unit data………………………………….………………………10

3.2.4 Definite-time and IDMTL overcurrent protection unit data……..10

3.2.5 Definite-time and IDMTL neutral protection unit data…….……….11

3.2.6 Neutral displacement protection unit data…………………..…………….11

3.2.7 Thermal overload protection unit data………………………..……………...12

3.2.8 Pole discordance protection unit data………………………………………….12

3.2.9 Over-load protection unit data……………….………………….……….………...13

3.2.10 Negative phase sequence imbalance detection protection unit data……………………………………………………………………………13

4. Hardware functions…………………………….…………………………….……………..14

4.1 Hardware arrangements………………………………………….………………………14

4.2 Operations of complete units………………………………….………………………14

4.3 Front panel……………………………………………………………….…………………………15

5. Protection functions…………………………………………………….…………………..16

5.1 Differential protection unit (ANSI-87T)…………………….…………………16

5.2 Restricted earth fault protection unit (ANSI-87TN)…………….……24

5.3 Overflux protection unit (ANSI-24)………………………………………………27

5.4 Definite-time and IDMTL overcurrent protection unit…………..….31

5.5 Definite-time and IDMTL neutral protection unit……………………….35

5.6 Neutral displacement protection unit………………………………….……….39

5.7 Thermal overload protection unit………………………………………………...40

5.8 Pole discordance protection unit……………………………………….………….41

5.9 Other auxiliary protection unit……………….…………………….……………...42

5.10 VT failure……………………………………………………………….……………………………44

6. Operation……………………………………………………..…………………………………….44

6.1 Safety precautions……………………………………………..…………………………….44

6.2 Dialog with the equipment……………………………….…………………………….45

6.2.1 Menu frame…………………………………………………………………………………………45

6.2.2 Display flowing………………………………………………………………………………….48

6.3 Annunciations…………………………………………….……………………………………..49

6.3.1 Event report………………………………………………………..……………………………..49

6.3.2 Alarm report……………………………………………………………………………………….51

6.3.3 Operating report……………………………………………………..…………………………53

6.4 Testing and commissioning…………………………….…………………….………..54

6.5 Putting the equipment into operation…………………….…………….………54

6.6 Configuration of functions……………………………………………………….………54

6.6.1 Configuration of functions…………………………………………….…………………54

6.6.2 Setting-equipment parameters………………………………………………………54

6.6.3 Setting-protection settings……………………………………………………………..55

6.6.4 Setting-Control word setting………………………………..…………………………62

7. Installation and commissioning……………………………….…….………………68

7.1 Unpacking & repacking…………………………………………………………………….68

7.2 Mounting………………………………………………………………..……………………………68

7.3 Check before power on……………………………………….…………………………..68

7.4 Check with power on……………………………..………………………………………..69

8. Maintenance……………………………………………………………………………………….70

8.1 Routine checks………………………………………….……………………………………….70

8.2 Replacing the back-up battery……………………….………………………………70

8.3 Fault tracing…………………………………………….………………………………………..70

8.4 Repairs………………………………………………………………………………………………..70

9. Store……………………………………………….…………………………………………………..71

10. Ordering………………………………………………………………………………………………72

10.1 Ordering data……………………………………………….…………………………………….72

10.2 Ordering data sample……………………………………………………………………….72

11. Appendix………………………………………………………………………………………………73

11.1 Terminal diagrams…………………………………………….……………………………..73

11.2 Connection Examples……………………………………………………………………….74

11.3 Digital input module…….…………………………………………………………………..77

11.4 Digital output module………...…………………………………………………………..77

CSC-326 Numerical Transformer Protection Equipment Manual

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1 Introduction

1.1 Application

CSC-326 numerical transformer protection equipment applies to small, medium and

large power transformers.

Equipments included in the CSC-326 series see table1 and 2.

Table 1: CSC-326 series equipments

Type Application

CSC-326(Model 1) For two-winding transformer

CSC-326(Model 2) For three-winding transformer or auto transformer

Table 2: Main function and arrangement

TypeFunctions and arrangement

CSC-326(Model1) CSC-326(Model2)

Main protection

Instantaneous differential

protection

√ √

Inrush inhibit with 2nd harmonic

Fuzzy recognition of inrushbased on waveform

selective selective

Differential

protection

Over-flux inhibit √ √

Restricted earth fault protection for HV √ √

Over-flux (definite and inverse ) for HV √ √

Restricted earth fault protection for MV Χ √

Over-flux (definite and inverse ) for MV Χ √

Restricted earth fault protection for LV configurable Χ

Backup protection in HV (high voltage)

side

Thermal overload protection √ √

Definite and IDMTL overcurrent protection (withselective direction)

√ √

Definite and IDMTL earth fault protection (withselective direction)

√ √

Phase-to-phase distance protection Configurable configurable

Phase-to-earth distance protection Configurable configurable

Neutral displacement protection Configurable configurable

IDMTL Neutral current protection for HV √ √

Overload protection √ √

Overcurrent blocking voltage regulation

protection

√ √

Backup protection in MV(middle voltage)

side

Only for three-winding transformer

or auto transformer

Definite and IDMTL overcurrent protection(withselective direction)

Χ √

Definite and IDMTL earth fault protection(withselective direction)

Χ √

Phase-to-phase distance protection Χ Configurable


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Phase-to-earth distance protection Χ Configurable

Neutral displacement protection Χ √

IDMTL Neutral current protection for MV Χ √

Overload protection Χ √

Overcurrent blocking voltage regulation

protection

Χ √

Backup protection in LV(low voltage) side

Definite and IDMTL overcurrent protection √ √Definite and IDMTL earth fault protection (withselective direction)

√ √

Neutral displacement protection √ √

Overload protection √ √

Overload for LV winding (inside delta) configurable configurable

Backup protection for Breakers

Pole discordance protection for HV CB1 √ √

Pole discordance protection for HV CB2 √ √

Pole discordance protection for MV CB Χ √

Other auxiliary protection

Negative phase sequence imbalance detection √ √

CB status supervision √ √

Disturbance records √ √

1.2 Features

The equipment has characteristics as follows:

• The microprocessor combined 32 bits DSP with MCU, high performance hardware systemensures the parallel real-time calculation in all components of the equipment.

• Protective functions man-machine interface and also communications functions arecompletely independent in equipment. This improves the reliability and makes debugginginstallation, maintenance easier.

• Internal module is designed in such a way that a comprehensive real-time self-monitoring is performed.

• Dual A/D sampling in analog circuit, performing real time self-testing.

• The equipment provides periodical automatic testing.

• Disturbance recorder with large capacity (memory up to 4M bytes), can record more than24 records. Optional event format or wave format is provided when the records need to beprinted. Fault wave disturbance records can be easily extracted through serial port orethernet port and saved in COMTRADE format.

• 1000 event records which are date and time tagged are stored in none volatile memory


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to ensure the data or not lost when DC supply fails.

• The relay can record protection operating process, logic flow and various calculatedvalues. Our CSPC software can be used for viewing the above and also the recorded faultdata and for analyzing disturbance records via RS 232 serial port on the relay front facia.

• 2-channel high speed reliable electric Ethernet ports (optional optical fiber Ethernetports), 2-channel LonWorks ports, RS-485 port and series printing port are provided; theuser can select any of these according to the requirements. The protocol supportsIEC60870-5-103, IEC61850 or CSC-2000 of Sifang Company, for interface with substationautomatic system and protection management information system.

• Liquid crystal display with backlight is provided to display various messages such ascurrent, voltage, power, frequency, strip state, setting zones etc. The menu is easy tooperate. Four shortcut keys are provided to finish operation with one key for local operator.

1.3 Functions

The following protection functions are available in the relay: Differential protection (Including: Treble slope percent differential protection;

Instantaneous differential protection and Inrush inhibit and over-flux inhibit etc.)

Restricted Earth Fault protection for HV, MV and LV sides

Over-flux protection for HV and MV sides

Definite and IDMTL overcurrent protection for HV, MV and LV sides (with selective

direction)

Definite and IDMTL neutral current protection for HV, MV and LV sides (with selective

direction)

Neutral displacement protection for HV, MV and LV sides

Pole discordance protection for HV and MV circuit breaker

Overload protection for HV, MV and LV sides and LV winding inside delta

Thermal overload protection for HV side

Overcurrent blocking voltage regulation protection for HV and MV sides

Negative phase sequence imbalance detection for HV, MV and LV side

Circuit breaker status supervision for every side

Disturbance records.


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2 Design

2.1 Mechanical structure

The enclosure for equipment is 19 inches in width and 4U in height according to

IEC 60297-3.

The equipment is flush mounting with panel cutout and cabinet mounting.

Connection terminals to other system are on the rear.

The front panel of equipment is aluminum alloy by founding in integer and overturn

downwards. LCD, LED s and setting keys are mounted on the panel. There is a serial

interface on the panel suitable for connecting a PC.

Draw-out modules for serviceability are fixed by lock component.

The modules can be combined through the bus on the rear board. Both the

equipment and the other system can be combined through the rear interfaces.

Fig.1: CSC-326 transformer protection equipment view


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2.2 Dimensions

Dimension drawings for CSC-326 are shown in Fig 2.

Fig. 2: Flush-mounted enclosure of CSC-326 with panel cutout (dimensions in mm)


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3 Technical data

3.1 General data

3.1.1 Analog input and output

Input circuits Rated current IN

Rated voltage UN

Rated frequency fNThermal overload capability

In voltage circuit, continuousIn current circuit, continuous

≤ 1s ≤ 10sPower consumption

In voltage circuit at UN=100VIn current circuit at IN = 1A

at IN = 5A

1 or 5A63.5V (Ph-N) or 110V AC(Ph-Ph)50Hz

1.2×UN AC2×IN

80×IN

10×IN

less than 0.5VAless than 1VAless than 1VA

3.1.2 Power supply

DC voltage supply Rated auxiliary voltage Uaux

Permissible tolerance at ratedauxiliary voltagePower consumption

at energized stateat quiescent state

220V DC; 110V DC-30% to +14%

max. 50Wmax. 30W

3.1.3 Binary inputs and outputs

Binary inputs Binary inputs for 110/220V DCBinary inputs for 24V DCCurrent consumption for eachinput

1292mA~5mA

Binary outputs Potential-free trip/command+signaling contacts (Binaryoutput)Switching capacity make BreakPermissible current ,Continuous 0.5sSwitching voltageIndication contactsSwitching capacity make/breakPermissible currentSwitching voltage

32 Potential-free trip/commandcontacts +16 signaling contacts

1250VA(AC), 150W(DC)5A30A250V DC161250VA(AC), 150W(DC)5A250V DC

3.1.4 Communications interfaces

Communications

interfaces

2 RS485 and 2 Ethernetinterfaces1 serial interface

Rear boardOn the front panel


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3.1.5 Other general data

Other General data of the equipment see table 3.

Table 3: General data of the equipment

No. Item Class/rated According

to standards

Note

1 Environment conditions

1.1 Ambient temperature -10ºC ~+55ºC1.2 Extreme range of ambient

temperature-25ºC ~+70ºC

1.3 Atmospheric pressure 80~110kPa1.4 Operative ranges of

auxiliary energizingquantities

80% ~110% UN

1.5 Relative humidity ≤75%1.6 Storage temperature -10ºC~+40ºC

IEC 60255-6:1988 (GB/T14047-1993, IDT)

2 Rated parameters

2.1 Rated value of voltage 110V or 220V2.2 Rated value of current 1A or 5A2.3 Rated value of frequency 50Hz3 Burden

3.1 rated burden• AC current circuit:≤ 1VA

• AC voltage circuit::≤0.5VA• DC power supply

circuit: ≤50W

DL/T 478-2001

4 Thermal property

4.1 Thermal of short and longtime

• AC current circuit:2IN -continuously:10IN -10s;80IN -1s;

• AC voltage circuit:1.2U -

continuously;1.4UN - 10s

DL/T 478-2001

Specific ratingdefined byManufacturerin IEC 60255-6: 1988

5 Electrical insulation

5.1 Insulation resistance 100MΩ IEC 60255-5:2000(GB/T 14598.3-2006,IDT)

5.2 Insulation resistance in dryheat

1.5MΩ DL/T 478-2001 Not defined inIEC60255-5

5.3 Dielectric voltage AC 2kV (Ui≥63V)/1kV (Ui<63V)

500V isdefined forless then 63Vin IEC 60255-5

5.4 Impulse voltage 5kV (Ui≥63V) /1kV(Ui<63V)

IEC 60255-5:2000(GB/T 14598.3-2006,IDT)

6 Mechanical property

6.1 Vibration 1 class IEC60255-21-1(GB/T 11287-2000,IDT)


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6.2 Shock 1 class

6.3 Bump 1 class

IEC60255-21-2(GB/T 14537-1993,IDT)

7 EMC

7.1 Burst disturbance 3 class:• common mode2.5kV,• differential mode1.0kV

IEC 60255-22-1(GB/T 14598.13-1998,IDT)IEC 61000-4-12

Add 100kHzharsh moreIEC60255-22-1

7.2 ESD disturbance 4 class: contact -8kV IEC 60255-22-2(GB/T 14598.14-1998,IDT)IEC 61000-4-2

Harsh more 3class of IEC60255-22-2

7.3 Radiated electromagneticdisturbance

3 class: 10V/m IEC 62505-22-3(GB/T 14598.9-2002,IDT)IEC 61000-4-3

7.4 Fast burst disturbance 4 class:• communication port --2kV;• others ports--4kV

IEC60255-22-4(GB/T14598.10-1996,IDT)IEC 61000-4-4

Harsh more 3class of IEC60255-22-4

7.5 Surge disturbance 4 class:• communication port

--2kV;• others ports --4kV

IEC 60255-22-5,IEC 61000-4-5

Harsh more 3Class of IEC60255-22 -5

7.6 Conducted disturbance ofRF

3 class: 10V IEC 60255-22-6IEC 61000-4-6

7.7 Power frequency magneticfield disturbance

5 class: 100A/m IEC 61000-4-8 No defined inIEC60255-22

7.8 Pulse frequency magneticfield disturbance

5 class: 1000A/m IEC 61000-4-9 No defined inIEC60255-22

7.9 Damped oscillatorymagnetic disturbance

5 class:100A/m IEC 61000-4-10 Actual up to120A/m,Nodefinedin IEC 60255 -22

7.10 interruptions in auxiliaryenergizing quantities

50ms GB/T 8367-1987(eqv IEC60255-11)IEC 61000-4-11

7.11 Electromagnetic emissionlimits

IEC 60255-25(GB/T14598.16-2002, IDT)

8 safety

8.1 IP rating IP20 IEC 60529,GB 16836-1997

8.2 Insulation cooperation Clearance andcreepage distance

IEC 60255-5:2000GB 16836-1997

8.3 Maximum temperature ofmaterial

According with thestandard

GB 16836-1997

8.4 Flammability of insulationmaterials

V0 class IEC 60950GB 16836-1997

8.5 Protection againstElectric shock

I class IEC 60536GB 16836-1997


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9 Trip relay contact

9.1 Capacity of contact cut out 50W9.2 Current of long time 5A

3.2 Function data

3.2.1 Differential protection unit data

Table 4: Differential protection unit data

Differential protection Setting ranges

High-current stage ID>>

Differential current ID>

Restraint current IR1 Restraint current IR2 Percentage of slope 2 2nd harmonic restraint ratio 5th harmonic restraint ratioTimes

Operating time(At 2 times of set value ID>)

Operating time(At 1.5 times of set value

ID>>) Drop-off timeDrop-off ratio

Tolerances

Pickup characteristic Inrush Restraint Additional Delay TimesOthers

Percentage of slop 1 Percentage of slop 3

settable 0.5A-100A

settable 0.1A-20A

0.2Ie~1.0Ie

2Ie~10Ie

0.2~0.70.05~0.300.10~0.60

less than 30ms

less than 20ms

approx. 40msapprox. 0.7

±5% of set value or ±0.02IN

±5% of set value±1% of set value or 10ms

0.2 fixed0.7 fixed

3.2.2 Restricted earth fault protection unit data

Table 5: Restricted earth fault protection unit data

Restricted earth fault

protection

Setting ranges

Differential current I0D>

Percent restrained K0D>Times

Operating time (At 2 times of set value) Drop-off timeDrop-off ratio

Tolerance

Pickup characteristic Additional time delay

0.3Ie~1.0Ie(Ie: nominal currentof the reference side )0.2~0.7

less than 30ms

approx. 40msapprox. 0.7


less than 30ms


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3.2.3 Overflux protection unit data

Table 6: Overflux protection unit data

Overflux protection

(Definite-time and

inverse-time

Overflux )

Setting Ranges

Reference voltage UN

Ratio( >N

N

ff

UU

/

/):

Time Delay T Pair of Values for Characteristic

of V/fTimes

At 1.2 times of set value Drop-off timeDrop-off ratio

Tolerance

Ratio( >N

N

ff

UU

/

/):

Time delays for definitecharacteristic

Time delays for Inversecharacteristic

40~100V

1.00~1.50

0.1s~9999.0s1.10/1.15/1.20/1.25/1.30/1.35/1.40

less than 40msapprox. 40msNot less than 0.96

±2.5% of the set value or lessthan 40ms

±3.0% of the set value or lessthan 40ms

3.2.4 Definite-time and IDMTL overcurrent protection unit data

Table 7: Definite-time and IDMTL overcurrent protection unit data

Definite-time

overcurrent

protection (with

selective direction)

Setting ranges

Current I>Time delay TThe sensitive angle of directional

elementTimes

Pickup time I> Operating time At 1.2 times ofset value Drop-off time I>Tolerance

Current pickup I> Angle of the directional element Time delaysDrop-off ratio

I>,Directional element:

Voltage thresholdAngle of the directional element

0.1×IN to 20×IN

0.1 to 20s-45°

approx. 20msless than 40ms

approx. 40ms


±3°not more than 40ms

not more than 0.90

1V170°±2°

IDMTL overcurrent

protection (with

selective direction )

Setting ranges

Current I>The sensitive angle of directional

elementTimes

Pickup time I> Operating time At 1.2 times of

0.1×IN to 20×IN

-45°



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set value Drop-off time I> Minimum operating time Maximum operating timeTolerance

Current pickup I> Angle of the directional element Time delaysDirectional element:


approx. 40ms100ms100s


±3°not more than ±5% or 0.3s

1V170°±2°

3.2.5 Definite-time and IDMTL neutral current protection unit data

Table 8: Definite-time and IDMTL neutral current protection unit data

Definite-time neutral

current protection

(with selective

direction)

Setting ranges

Current 3I0>Time delay TTimes

Pickup time 3I0> Operating time At 1.2 times ofset value Drop-off time 3I0>Tolerance

Current pickup 3I0> Angle of the directional element Time delaysDrop-off ratio

3I0>Directional element:

Zero voltage thresholdAngle of the directional element

0.1×IN to 20×IN

0.1 to 20s


approx. 40ms


±3°not more than 40ms

approx. 0.9

0.5V160°±3°

IDMTL neutral current

protection (with

selective direction)

Setting ranges

Current 3I0>Times

Pickup time 3I0> Operating time At 1.2 times ofset value Drop-off time 3I0> Minimum operating time Maximum operating timeTolerance

Current pickup 3I0> Angle of the directional element Time delaysDirectional element:


0.1×IN to 20×IN


approx. 40ms100ms100s


±3°not more than ±5% or 0.3s

1V160°±3°

3.2.6 Neutral displacement protection unit data

Table 9: Neutral displacement protection unit data

Neutral displacement

protection(for HV,MV

and LV side of the

transformer)

Setting ranges

Voltage 3U0>

Time delay TTimes

2 to 300V(HV & MV ),2 to 100V (LV )0.1 to 20s


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Pickup time 3U0> Operating time At 1.2 times ofset value Drop-off time 3U0>Tolerance

Voltage pickup 3U0> Time delaysDrop-off ratio

3U0>


approx. 40ms

±5% of set value or ±0.1Vnot more than 40ms

approx. 0.9

3.2.7 Thermal overload protection unit data

Table 10: Thermal overload protection unit data

Thermal overload

protection

Setting ranges

Current I>Thermal heating/cooling time

const1-H/C hot spot weighting factorTimes

Operating times are calculatedfrom IEC Cold Curve and IEC HotCurve.IEC Cold Curve

IEC Hot Curve

Tolerance

Current pickup I>Thermal trip time

0.1×IN to 10×IN

0.0s~9000.0s

0.0~1.0

−

−−=

22

22 )/1(ln

θ

τII

ICHIt

eq

Peq


not more than ±5% or 0.3s

3.2.8 Pole discordance protection unit data

Table 11: Pole discordance protection unit data

Pole discordance

protection

Setting ranges

Current 3I0>Current I2>Time delay T

Times

Pickup time 3I0> ,I2>Operating time At 1.2 times of

set value Drop-off time 3I0>, I2>Tolerance

Current pickup 3I0>, I2> Time delaysDrop-off ratio

3I0>, I2>

0.1×IN to 20×IN

0.1×IN to 20×IN

0.1 to 20s


approx. 40ms


not more than 40ms

approx. 0.9

−=

22

2

lnθ

τII

It

eq

eq


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3.2.9 Over load protection unit data

Table 12: Over load protection unit data

Overload protection Setting ranges

Operating quantity Setting range Alarm time delay

Reset ratioTolerance

Current I> Time delays

Definite time, one stage.0.1-20A0.1-3600 seconds. Currentoverload is used only for alarm.Not less than 0.96


approx. 40ms

3.2.10 Negative Phase Sequence Imbalance Detection protection unit data

Table 13: Negative phase sequence imbalance detection protection unit data

Negative Phase

Sequence Imbalance

Detection protection

Setting ranges

Current setting (I2>) Time delay

0.1-20A0.1-20s


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4. Hardware functions

4.1 Hardware arrangements

9TE2TE 9TE9TE 4TE 4TE 8TE 4TE4TE 4TE4TE 2TE6TE4TE 4TE

CSC-326 Numer i cal Tr ansf ormer Pr ot ect i on(Model 1)

AI 3

6SF.001.041.2

6SF.001.041.2

6SF.001.041.2

AI 1

1 2

AI 2

6SF.004.071.2

6SF.004.100.1

6SF.004.071.2

3 4 5 6

MASTER

7

DI

12

POWER

6SF.009.030

6SF.004.125.1~3

4TE4TE

6SF.004.041.3

10

DO2

6SF.004.044

9

DO1

11

6SF.004.045

DO3

Fig.3: Arrangement diagram of the CSC-326 system module (Model 2)

9TE2TE 9TE9TE 4TE 4TE 8TE 4TE4TE 4TE4TE 2TE6TE4TE 4TE

CSC-326 Numer i cal Tr ansf ormer Pr ot ect i on(Model 2)

AI 3

6SF.001.041.2

6SF.001.041.2

AI 1

1

6SF.004.071.2

6SF.004.100.1

6SF.004.071.2

2 3 4 5

MASTER

6

DI

10

POWER

6SF.009.030

6SF.004.125.1~3

4TE4TE

6SF.004.041.3

8

DO2

6SF.004.044

7

DO1

9

6SF.004.045

DO3

Fig.4: Arrangement diagram of the CSC-326 system modules (Model 1)

4.2 Operations of complete units

Analog input unit (AI)

There are 3 analog input units, which consists of voltage and current transformers. 36

analog inputs at most are available in the analog input section. The parameters of the

current and voltage transformers are as follows:

Phase current transformer: rated current 5A or 1A.

Phase voltage transformer: rated voltage 63.5V, linearity range 1V~100V.

Open delta voltage transformer: linearity range 3V~300V.

Protection CPU plug-in unit (CPU)

CPU unit is a key element; the same two units are used for redundancy. CPU plug-in


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unit is responsible for all the protection function A/D conversation software and hardware

self monitoring and diagnostics.

Communication master plug-in unit (MASTER)

The function of this unit is device master and communication. The main functions are

as follows:

Receiving and storing the fault report and event report of the CPU unit, output for

printing and communicating with the monitoring system and protection engineering

workstation by Lon network or Ethernet network

Output report to the display screen and operating the device with the keyboard of the

front panel.

The standard RS-232 port in front panel is suitable for connecting a PC. The PC based

software CSPC can be used for convenient and transparent setting, recording disturbance

and evaluation as well as commissioning. 2 RS485 and 2 Ethernet interfaces (or 2 electric

or fiber Ethernet interfaces, selective) are equipped on the rear board. It is convenient to

connect to a substation automation system or to a protection data master unit.

Digital input plug-in unit (DI)

The CPU obtains external information through the digital inputs such as blocking

commands for protective functions or position indications of circuit breakers.

Digital output plug-in unit (DO)

The CPU issues commands to external equipment via the output contacts. These

output commands are generally used to operate circuit breakers or other switching

devices. They can also be connected to other protective devices, annunciators, or external

carrier equipment for use in Pilot-Relaying schemes.4 digital input plug-in units and 39

outputs at most are provided.

Power supply plug-in unit (POW)

The CSC-326 can be supplied with power supply voltage 110V or 220V. The output of

power supply unit is +24V, ±12V, +5V.

4.3 Front panel

SI O

QUI T SET

F1 F3F2 -+F4

RESET

Fig.5: Front panel of CSC 326


-16-

5 Protection functions

5.1 Differential protection unit(ANSI-87T)

5.1.1 Function description

Basic principle

The numerical current differential protection of the CSC-326 is a fast short-circuits

protection for transformers. The protected zone is selectively limited by the CTs at its ends.

When an external fault causes a heavy current to flow through the protected transformer,

differences in the magnetic characteristics of the current transformers CT1 and CT2 under

conditions of saturation may cause a significant current to flow through the differential

element. To prevent the protection from such erroneous operation, a stabilizing current is

brought in.

1Iɺ

2Iɺ

T

The protected object

Fig.6: Basic principle of differential protection for two ends (single phase)

Current restraint

The differential current diffI and the restraining current resI are calculated by the

following formula (5-1):

≠−=

=

∑

∑−

=

••

=

•

1

1

(max)

1

)(2

1N

i

ijres

N

i

idiff

jiIII

II

(5-1)

Where, iIɺ is the current vector of side I,

iIɺ is the vector of current of HV, MV and LV windings;

N- Total current input, suppose it is N sides;

(max)jIɺ - The maximum current vector of the N input, suppose it is side j;

1

1

( )N

i

i

I i j−

=

≠∑ - Sum of the other current input, not including side j.

diffI is derived from the fundamental frequency current and produces the tripping

effect quantity, resI counteracts this effect iIɺ is the current of every side. To clarify the

situation, three important operating conditions with ideal and matched measurement

qualities should be examined.

Transformers are subject to a number of influences that induce differential currents


-17-

even during normal operation, such as automatic ratio compensation, automatic vector

group compensation, instantaneous differential protection, treble slope percentage

differential protection, inrush stabilization, over-flux stabilization, CT saturation recognition

and CT failure supervision etc.

Automatic Ratio compensation

Differences in the matching of CTs to the rated current of the transformer are not

uncommon. These differences result in an error that leads to a differential current.

The characteristic values of the transformer, i.e. rated apparent power, rated voltages

and primary rated CT currents, are entered in the protective device, and the rated current

of the every side of the transformer NI1 is calculated automatically according to the

following formula:

N

NN

U

SI

1

13

=

Where, NS - Rated apparent power of the transformer

1NU -Rated voltage

The secondary rated current is calculated by the following formula, for differential

protection, eI is taken as the reference current.

CTHV

Ne

n

II

1=

Rated current of the High voltage side is taken as the reference current. The digitized

currents are automatic matched the rated current of the high voltage side of the

transformer, and a correction factor KCT for MV or LV side is calculated according to the

following formula:

CTHV

CTMV

NHV

NMV

CTHV

CTMV

NMVN

NHVN

CTMVNMV

CTHVNHV

NMV

NHVCTMV

n

n

U

U

n

n

US

US

nI

nI

I

IK ⋅=⋅===

1

1

1

1

1

1

2

2

3/

3/

/

/

CTHV

CTLV

NHV

NLV

CTHV

CTLV

NLVN

NHVN

CTLVNLV

CTHVNHV

NLV

NHVCTLV

n

n

U

U

n

n

US

US

nI

nI

I

IK ⋅=⋅===

1

1

1

1

1

1

2

2

3/

3/

/

/

Where, CTMVK - Correction factor for middle voltage side

CTLVK - Correction factor for Low voltage side

NI1 - Primary rated current of the transformer ( NHVI1 for high voltage side,

NMVI1 for middle voltage side, NLVI1 for low voltage side)

NI 2 - Secondary rated current of the transformer ( NHVI2 for high voltage side,

NMVI2 for middle voltage side, NLVI2 for low voltage side)

CTn - CT ratio of the transformer ( CTHVn for high voltage side, CTMVn for

middle voltage side, CTLVn for low voltage side)

NU1 - Rated voltage of the transformer ( NHVU1 for high voltage side, NMVU1 for

middle voltage side, NLVU1 for low voltage side)

The primary and secondary rated currents for HV side are automatically calculated by

CPU according to the common parameters of the transformer, KCT for every side is

calculated too. You can look over these settings form the menu ‘Set for Test’. These


-18-

settings are very helpful for engineer to test the differential protection.

Automatic Vector group compensation

Transformers have different vector groups, which cause a shift of the phase angles

between the primary and the secondary side. Without adequate correction, this phase shift

would cause a differential current.

Transformers often have a wye-delta connection, to allow a maximum of versatility in

the use of the CSC326. All imaginable vector group compensations have been integrated in

the software. If the setting “Vector Group Angle (VET GRP ANGLE)” and the settings for

every connection type (wye or delta, 1-delta, 0-wye) are entered to the device, the vector

group compensation is automatically completed.

The following paragraph explains the basic principle of numerical vector group

connection in an exemplary way for an Y(N)d11 transformer.

A

B

C

Side 1

A

B

C

Side 2

AIɺ

BIɺ

CIɺ

BIɺ

CIɺ

AIɺ

AIAI3

⋅

⋅=

′

′

′

C

B

A

C

B

A

I

I

I

I

I

I

ɺ

ɺ

ɺ

ɺ

ɺ

ɺ

1

1-

0

0 1-

1 0

1- 1

3

1

⋅

⋅=

′

′

′

C

B

A

C

B

A

I

I

I

I

I

I

ɺ

ɺ

ɺ

ɺ

ɺ

ɺ

1

0

0

0 0

1 0

0 1

1

Fig.7: Vector Group compensation for a Y(N)d11 Transformer (Isolated Star-point)

Deducting on side 1 the current ( BA II ɺɺ − ) results in the current AI ′ɺ , this has the same

direction as AI ′ɺ on side 2. Multiplying it with 31 matches the absolute value. The matrix

describes the conversion for all three phases. The zero sequence currents are eliminated in

this case.

CSC-326 performs automatic phase angle compensation for the entire common

transformer winding connections. This simplifies application of the relay as all CTs could be

connected in wye.

Some cautions for the setting “Vector Group Angle (VET GRP ANGLE)” are follows:


-19-

Table 14: Instruction for Vector Group Angle setting

Setting name Values

HV WIND CONN/Y-0 D-1 0 0 0 1 1 1 0 1

MV WIND CONN/Y-0 D-1 0 1 0 1 1 0 1 0

LV WIND CONN/Y-0 D-1 1 1 0 1 0 0 0 1

VET GRP ANGLE odd odd even even odd odd -- --

Remarks Y-Y-D-

1/3/5/

7/9/11

Y-D-

D-

1/3/

5/7/

9/11

Y-Y-

Y-

0/2/

4/6/

8/10

/12

D-D-

D-

0/2/4

/6/8/

10/12

D-D-Y-

1/3/5/

7/9/11

D-Y-Y-

1/3/5/

7/9/11

invali

d

invalid

Remark: for two winding transformer, no setting “MV WIND CONN/Y-0 D-1”.

Instantaneous differential characteristics

An instantaneous (unrestrained) differential characteristics entail over-current

protection is provided for fast tripping on heavy internal faults. As soon as the differential

current rises above the threshold >>DI (setting >>DI ), a trip signal is issued regardless of

the magnitude of the restraining current. This is always the case when short-circuit current

is higher than 1/Ud*IN.

This stage can operate even when, for example, a considerable second harmonic is

present in the differential current, which is caused by current transformer saturation by a

DC component in the short-circuit current, and which could be interpreted by the inrush

inhibit function as an inrush current.

This high-current stage evaluates the fundamental component of the differential

current as well as the instantaneous values, Instantaneous value processing ensures fast

tripping even in case the fundamental component of the current is strongly reduced by

current transformer saturation. Fast trip area is shown in the Fig.8.

Treble slope percent differential protection

Percent differential protection uses a treble-slope dual break-point operating

characteristic with magnetizing inrush and over-flux inhibits integrated. Operation

characteristics of the differential protection with fault characteristic see in Fig.8.

Branch 1 represents the sensitivity threshold of the differential protection

(setting >DI ) and considers constant error currents such as magnetizing currents. Branch

2 considers current-proportional errors which may result from transformation errors of the

main CTs or the input CTs of the relay or which may be caused by mismatching or by the

influence of tap changers in transformers with voltage control. In the range of high

currents, which may give rise to CT saturation, branch 3 provides for additional

stabilization.


-20-

IR1

ID>

Idiff

Ires

Restraint current

Differential current

Slope 3

Slope 2

Slope 1

Trip area

block area

ID>>

Fast trip area

IR2

Fig.8: Differential protection characteristics for transformers

The currents diffI and resI are compared by the differential protection with the

operating characteristic according to the following formula (5-2),

<+×+−+−≥

≤<+×+−≥

≤+≥

resRDRRRRresdiff

RresRDRRresdiff

RresDresdiff

IIIISIISIISI

IIIIISIISI

IIIISI

21112223

211112

11

)()(

)( (5-2)

Where, 1S - Slope of the branch 1, is fixed 0.2.

2S - Slope of the branch 2, (setting “DIFF SLOPE”).

3S - Slope of the branch 3, is fixed 0.7.

DI - Setting for the sensitivity threshold of the differential protection, (setting

“DIFF ID>”)

1RI - Setting for the first breakpoint restraint current, (setting “DIFF IR1”)

2RI - Setting for the second breakpoint restraint current, (setting “DIFF IR2”)

If the quantities result into a locus in the trip area, a trip signal is given. This stage

can’t operate when it is the inrush or over-flux stabilization.

Selective inrush stabilization schemes

CSC-326 provides 2 schemes to cope with the magnetizing inrush conditions. One

scheme is 2nd harmonic stabilization; the other scheme is fuzzy recognition of inrush

conditions based on the waveform. The two schemes are convenient for user to select by

the setting“2nd HAR NOT WAVE” (1- 2nd harmonic; 0-fuzzy recognition of inrush based on

waveform)

1) 2nd harmonic stabilization

In particular, high short-time magnetizing currents may be present in transformers

during power-up. Since these currents are seen only on one side of the transformer, they

act like fault current entering from one side.

The inrush currents can amount to a multiple of the rated current and are

characterized by a considerable 2nd harmonic content which is practically absent in the

case of short-circuit. If the second harmonic content exceeds a selective threshold (setting

“DIFF 2nd HAR RATIO”), tripping is blocked.


-21-

The ratio between the 2nd harmonic and the fundamental frequency component is

used for inrush discrimination; it is formula (5-3):

φφ dhard IKI 2.2 > (5-3)

Where, 2φdI - 2nd harmonics magnitude of differential current

2.harK - Setting for 2nd harmonics ratio

φdI - Fundamental frequency component of differential current.

In “modern type” transformers, the 2nd harmonics content may not exceed the

threshold value in all three phases on switch-on. To avoid spurious tripping, the cross block

function is activated. As soon as an inrush current is detected in one phase, the other

phases of the differential protection stage are blocked.

2) Fuzzy recognition of inrush based on the waveform

Assume differential current derivative as ( )I k , sampling number per cycle is 2n, for

sequence of number:

nknkIkInkIkIkX ...2,1),)()(/()()()( =++++= (5-4)

Since the smaller )(kX is, the more fault current information the point contains.

Degree of confidence for fault current is larger for this point. Otherwise, the larger )(kX is,

the more inrush current information the point contains. Degree of confidence for inrush

current is larger for this point. Assume membership function as )]([ kXA , for nk ...2,1= , get

the fuzzy similarity coefficient N with point of one cycle:

∑=

=n

k

nkXAN

1

/)]([

(5-5)

Assume threshold K, if N>K, consider as fault current. Otherwise, consider as inrush

current.

The blocking mode is for each phase, which means that current is considered as inrush

current. Percentage differential current protection of this phase is blocked.

Over-flux stabilization

Unwanted differential currents may also be caused by transformer over-flux due to

excessive voltage.

Steady-state over-flux of the transformer is characterized by odd harmonic content.

The 3rd or 5th harmonic is suitable to provide stabilization. But, as the 3rd harmonic is

often eliminated in power transformers, the use of 5th harmonic is common.

The cross block feature with 5th harmonics works in the same way as with 2nd

harmonics. If the fifth harmonic content exceeds a selective threshold (setting “DIFF 5th

HAR RATIO”), tripping is blocked.

CT Failure supervision and CT saturation recognition

CT failure supervision can be enabled or disabled through setting “CT FAIL DET ON”

(1-on, 0-off), when CT failure, if the differential protection is in trip area, the differential

will trip.

The criteria for CT failure detection are as follows:

1) All three phases are normal, and the differential current is near to zero. When one


-22-

phase current is decreased to less than a threshold (half of the memory current),

maybe CT failure occurs in the mutative phase.

2) Only one phase in one side has no current and all three phases in others sides are

normal and differential current is more than a threshold, maybe CT failure occurs

in the phase without current.

CT saturation recognition is integrated in differential protection. The criteria for CT

saturation are as follows:

1) 2nd and 3rd harmonic current of all phase current, if the result of 2nd and 3rd

harmonic is more than a threshold (fixed in the software), maybe CT saturation occurs.

2) Making use of the sampling differential to judge whether internal fault induce the

CT saturation.

If the CT saturation induced by external fault, the differential protection will be

blocked, whereas the protection will give trip signal.

Tripping Logic of the differential protection is shown in Fig.9.

IDIFF>> Trip

INST DIFF ON

22. dAdAIKI >

22. dBdBIKI >

22. dCdCIKI >

55. dAdAIKI >

55. dBdBIKI >

55. dCdCIKI >

CT Fail

SetdAII >

dBII >

dCII > DIFF Alarm5s

>=1

&INST DIFF A ACT

PER DIFF ON

>=1

ID>

&IDIFF> Trip

>=1

2nd HAR ON

5th HAR ON

>=1 &

&

CT FAIL DET ON

Set

Set

>=1

INST DIFF B ACT

INST DIFF C ACT

CT FAIL &

DIFF ALARM ON

&

Fig.9: Tripping logic of the differential protection

Differential current alarm

When the imbalance differential current is more than a threshold (fixed DI3.0 , DI is


-23-

setting), alarm will be given to remind user to detect the secondary circuit and the setting

“DIFF ALARM ON” (1-on, 0-off) can be used to enable or disable this function.

In order to avoid the incorrect alarm, a step is adopted for the threshold when the

differential current is less than limits. It is shown in following formula. Timer for alarm is

fixed to 5 seconds.

==<

==<

AIAIAI

AIAIAI

nalarmDD

nalarmDD

5 if ,3.0 ,3.03.0

1 if ,1.0 ,1.03.0

.

.

5.1.2 Settings of differential protection

Table 15: Setting of Differential protection

No Setting TitleSetting

options

Default

settingComment

1 DIFF ID>> 0.5…100A 20Instantaneous Differential(ID>>) current setting

2 DIFF ID> 0.1…20A 2Percentage Differential (ID>)current setting

3 DIFF IR1 0.1…5A 2The 1st breakpoint restraintcurrent (IR1)

4 DIFF IR2 0.1…50A 2The 2nd breakpoint restraintcurrent (IR2)

5 DIFF SLOPE 0.2…0.7 0.7 the 2nd slope

6DIFF 2nd HAR

RATIO0.05…0.30 0.15 2nd harmonic(HAR) ratio

7DIFF 5th HAR

RATIO0.10…0.60 0.35 5th harmonic(HAR) ratio

8 IDIFF ON 1/0 0Instantaneous differential(IDIFF)protection ON 1-on; 0-off.

9 PDIFF ON 1/0 0Percentage differential(PDIFF)protection ON 1-on; 0-off.

10 2nd HAR NOT WAVE 1/0 0

2nd harmonic(HAR) inhibit notthe fuzzy recognition based onthe waveform(WAVE)1-2nd harmonic on;0- waveform on

11 5th HAR ON 1/0 0 5th harmonic (HAR) inhibit on1-on; 0-off.

12 DIFF ALARM ON 1/0 0Differential current(DIFF)Alarming on1-on; 0-off.

13 CT FAIL DET ON 1/0 0 CT FAIL Detection(DET) on1-on; 0-off.

Remark: above the double line for settings, below double lines for Control word.

Note: When the equipment is delivered, the differential protection function is switched to 0

(OFF), This is because this protection function must not be used before at least the vector

group angle and common parameters for every side have been correctly set. Without these

settings the equipment may show unpredictable behavior.(e.g. tripping)!


-24-

5.2 Restricted earth fault protection unit(ANSI-87TN)


The restricted earth fault protection detects earth faults in transformers. It is sensitive,

and more sensitive than the classical differential protection. Typical application would be

star-point earthing transformers and auto-transformers.

A precondition is that a CT is installed in the star-point connection, i.e. between the

star-point and earth. The star-point CT and the three phase CTs define the limits of the

protected zone exactly.

Examples are illustrated in the Figures 10 to 11.

A

B

C

Side 1

A

B

C

Side 2

CSC-326 013Iɺ

2.AIɺ

2.BIɺ

2.CIɺ

Fig.10: Restricted earth fault protection on an earthed transformer winding

A

B

C

CSC-326

A

B

C

013Iɺ

2.AIɺ

2.BIɺ

2.CIɺ

3.AIɺ

3.BIɺ

3.CIɺ

Fig.11: Restricted earth fault protection on an auto-transformer

Basic principle

During healthy operation, no neutral current 013Iɺ flows through the neutral lead, the

residual current 2.2.2.023 CBA IIII ɺɺɺɺ ++= is zero (Fig.9). For auto-transformer the residual

current 2.2.2.023 CBA IIII ɺɺɺɺ ++= and 3.3.3.033 CBA IIII ɺɺɺɺ ++= are zero (Fig.11).

When an earth fault occurs in the protected zone, a neutral current 013I will flow;

depending on the neutral point earthing conditions of the power system a further neutral


-25-

current may be recognized in the residual current path of the phase CTs. Since all currents,

which flow into the protected zone, are defined positive, the residual current from the

system will be more or less in phase with the neutral point current.

When an earth fault occurs outside the protected zone, a neutral point current 013I will

flow equally; but the residual current of the phase CTs 023I is now of equal magnitude and

in phase opposition with the neutral point current.

When a fault without earth connection occurs outside the protected zone, a residual

current may occur in the residual current path of the phase CT, which is caused by

different saturation of the phases under strong through-current conditions. This current

could simulate a fault in the protected zone. Wrong tripping must be avoided under such

condition.

The differential current 0diffI and the restraining current 0resI are calculated according

to formula (5-6),

3,3,3max

333

3.02.01.00

3.02.01.00

=

++=

IIII

IIII

res

diff

ɺɺɺ

ɺɺɺ

(5-6)

0diffI and 0resI are compared by the restricted earth fault protection with the operating

characteristic according to the following formula (5-7), Ratio compensation and CT fault

recognition etc are integrated in the protection.

>×≥

≤≥

DDresresDdiff

DDresDdiff

SIIISI

SIIII

000000

00000

/

/ (5-7)

Where, DI 0 - setting for the sensitivity threshold of restricted earth fault protection

DS0 - Slope of the branch

Diff0I

Res0I

0DI

DS0

Trip area

block area

Fig.12: Characteristic of restricted earth fault protection

Percent differential protection uses a dual-slope operating characteristic, Restraint

characteristic of restricted earth fault protection see in Fig.12.

Zero differential Ratio compensation

If 3-phase CT ratio is unequal to REF CT ratio, the difference in currents results anerror that leads to a zero differential current. So the reference side is taken and zerodifferential ratio compensation is calculated by the software.

For normal transformer, zero differential ratios are calculated according to thefollowing formula:


-26-

HV

REFHVREFHV

n

nK = ;

MV

REFMVREFMV

n

nK = ;

LV

REFLVREFLV

n

nK =

Where, REFHVK - ratio compensation for HV NCT;

REFMVK - ratio compensation for MV NCT;

REFLVK - ratio compensation for LV NCT;

For auto-transformer, zero differential ratios are calculated according to the followingformula:

HV

MVMV

n

nK = ,

HV

REFREF

n

nK =

Where, MVK - ratio compensation for MV CT;

REFK - ratio compensation for common winding NCT;

Reference side selection is shown in Table 16.

Table 16: Reference side selection for REF functions

Type function HV REF MV REF LV REF

2 winding HV CT --- LV CT

3 winding HV CT MV CT ---

Auto-transformer HV CT --- ---

Remark: ”---“shows that the function is not configured.

REF zero differential current alarm

When the imbalance zero differential current is more than a threshold (fixed DI 03.0 , DI 0

is setting), alarm will be given to remind user to detect the secondary circuit.

In order to avoid the incorrect alarm, a step is adopted for the threshold when the

zero differentials current is less than limits. It is shown in following formula. Timer for

alarm is fixed to 5 seconds.

==<

==<

AIAIAI

AIAIAI

nalarmDD

nalarmDD

5 if ,3.0 ,3.03.0

1 if ,1.0 ,1.03.0

.

.

REF ON

& REF Trip

REF AlarmIdiff0>0.3I0D

& 5s

Fig.13: Tripping logic of the restricted earth fault protection.

Tripping Logic of the restricted earth fault protection is shown in Fig.13.

5.2.2 Settings of Restricted earth fault protection


-27-

Table 17: Setting of Restricted earth fault protection


options

Default

settingComment

1 HV REF I> 0.1…10A 2 Restricted earth fault setting

2 HV REF SLOPE 0.2…0.7 0.5Slope setting for restricted earth faultprotection

3 HV REF ON 1/0 0HV Restricted earth fault (REF) ON1-on; 0-off.

4 MV REF I> 0.1…10A 2 Restricted earth fault setting

5 MV REF SLOPE 0.2…0.7 0.5Slope setting for restricted earth faultprotection

6 MV REF ON 1/0 0MV Restricted earth fault (REF) ON1-on; 0-off.

7 LV REF I> 0.1…10A 2 Restricted earth fault setting

8 LV REF SLOPE 0.2…0.7 0.5Slope setting for restricted earth faultprotection

9 LV REF ON 1/0 0LV Restricted earth fault (REF) ON1-on; 0-off.

Remarks: 1. Different functions for HV, MV and LV are distinguished by treble lines;

2. In one function, above the double line for settings, below double lines for

Control word.

5.3 Over-flux protection unit (ANSI 24)


The over-flux protection is used to detect impermissible over-flux conditions which can

endanger transformers. The over-flux protection must pick up when the induction

admissible for the protected transformers is exceeded. The transformer is endangered, for

example, if the power station block is disconnected from the system for full-load, and if the

voltage regulator either does not operate or does not operate sufficiently fast to control the

associated voltage rise. Similarly, decrease in frequency, e.g. in island system, can

endanger the transformer because of increased induction.

An increase in induction above the rated values leads very quickly to saturation of the

iron core and to large eddy current losses. The over-flux protection feature servers to

measure the voltage/frequency ratio which is proportional to the B induction and puts it in

relation to the BN nominal induction. In this context, both voltage and frequency are

related to nominal values of the object to be protected transformer. The formula (5-8) is

for calculating the voltage/hertz ratio. The calculation is based on the maximum voltage of

the three phase voltages. The frequency range from 25Hz to 65Hz can be monitored in this

way.

*

*

f

U

fU

fU

B

BN

NNN

=== (5-8)

Where, N - ratio of volt/hertz

U - phase-neutral voltage

The over-flux protection feature includes two staged characteristics and one thermal


-28-

characteristic for an approximate modeling of the heating which the over-flux may cause to

the protected transformers. The inverse characteristic can be set via seven points derived

from the manufacturer data (see Fig.14); In addition, a definite-time alarm stage and a

definite-time trip stage can be used.

u/f

N0

N1

N2

N3

N4

N5

N6

N7

T7 t ( s)T6 T5 T4 T3 T2 T1 T0

Pickup thresh

old u/f

Inverse trip stage

overflux trip stage

Fig.14: Inverse over-flux characteristic

Tripping Logic of the over-flux protection is shown in Fig.15.

AlarmFVf

U AB _/>

AlarmFVf

U BC _/>

AlarmFVf

UCA _/>

>=1

V/F Alarm ON

&

T AlarmDEF V/F Alarm

V/F Voltage

VP-P

AlarmFVf

U A _/>

AlarmFVf

UB _/>

AlarmFVf

UC _/>

>=1

&


-29-

TripFVf

U AB _/>

TripFVf

U BC _/>

TripFVf

UCA _/>

>=1

V/F Trip ON

&

T Trip DEF V/F Trip

V/F Voltage

VP-P

>=1

TripFVf

U A _/>

TripFVf

U B _/>

TripFVf

UC _/>

&

IVR V/F PAB

>=1

INV V/F ON

&

INV V/F Trip

IVR V/F PBC

IVR V/F PCA

V/F Voltage

VP-P

>=1

IVR V/F PA

IVR V/F PB

IVR V/F PC

&

Fig.15: Tripping logic of over-flux protection

5.3.2 Settings of Over-flux protection

Table 18: Setting of over-flux protection


options

Default

settingComment

1 HV Ubase 40…100 57.3 Nominal phase voltage in HV side

2 HV DEF V/F> Alarm 1.0...1.5 1.1 Alarming setting of volt/herz

3 HV T DEF V/F Alarm 0.1…9999s 10Timer setting for volt/herz alarmingstage

4 HV DEF V/F>> Trip 1.0...1.5 1.2Tripping setting of definite volt/herzstage

5 HV T DEF V/F Trip 0.1…9999s 10Timer setting for definite volt/herzstage

6 HV T1 IVR V/F=1.10 0.1…9999s 70 Timer setting for volt/herz=1.10


-30-







13 HV V/F> ALARM ON 1/0 0HV Definite Overflux (V/F) Alarming on1-on; 0-off.

14HV DEF V/F> TRIP

ON1/0 0

HV Definite (DEF)Overflux (V/F) on1-on; 0-off.

15 HV IVR V/F> ON 1/0 0HV Inverse (IVR)Overflux (V/F) on1-on; 0-off.

16 MV Ubase 40...100 57.3 Nominal phase voltage in MV side

17 MV DEF V/F> Alarm 1.0...1.5 1.1 Alarming setting of volt/herz

18 MV T DEF V/F Alarm 0.1…9999s 10Timer setting for volt/herz alarmingstage

19 MV DEF V/F>> Trip 1.0...1.5 1.2Tripping setting of definite volt/herzstage

20 MV T DEF V/F Trip 0.1…9999s 10Timer setting for definite volt/herzstage

21MV T1 IVRV/F=1.10

0.1…9999s 70 Timer setting for volt/herz=1.10

22MV T2 IVRV/F=1.15


23MV T3 IVRV/F=1.20


24MV T4 IVRV/F=1.25


25MV T5 IVRV/F=1.30


26MV T6 IVRV/F=1.35


27MV T7 IVRV/F=1.40


28 MV V/F> ALARM ON 1/0 0MV Definite Overflux (V/F) Alarming on1-on; 0-off.

29MV DEF V/F> TRIP

ON1/0 0

MV Definite (DEF)Over-flux (V/F) on1-on; 0-off.

30 MV IVR V/F> ON 1/0 0MV Inverse (IVR)Over-flux (V/F) on1-on; 0-off.

Remarks: 1. Different functions for HV, MV and LV are distinguished by treble lines;

2. In one function, above the double line for settings, below double lines for

Control word.


-31-

5.4 Definite and IDMTL overcurrent protection unit


This protection function is a backup protection for the transformer and the power

system. The protection comprises 2 stages definite overcurrent I> and 1 stage IDMTL

overcurrent. The integrated directional function can be applied to the overcurrent

protection via binary settings. This function is offered in every side of the transformer.

Definite overcurrent element

If the direction is disabled, the overcurrent element only use the maximum current of

three phase current, the operation criterion is

setcba IIII >),,max( (5-9)

Where, setI - setting for overcurrent protection.

If the direction is enabled, the overcurrent element operate for each phase, the

operation criterion is:

setII >Φ ( cba ,,=Φ ) (5-10)

IDMTL overcurrent element

IDMTL overcurrent element using the IEC or ANSI curves is provided. Both IEC curves

and ANSI curves can be expressed by one formula as follows,

+

−

×= B

I

I

AMt

P

S

1

(5-11)

Where, I - Fault current;

SI - current setting;

M - time multiplier;

A, P, B- the characteristic parameter for IDMTL curves, reference to table 14.

IEC IDMTL curves include four kind curves, and they are NI (Normal Inverse), VI

(Inverse), EI (Extreme Inverse), and LTI. ANSI curves include three kinds of curves, and

they are MI, VI and EI. The maximum timer t for IEC and ANSI is fixed to 100s.

In order to meet the IEC and ANSI curves, the function include setting M, setting A,

setting P, setting B and setting SI .

Table 19: parameters for IDMTL curves

IDMTL Curves Parameter A Parameter P Parameter B

IEC NI 0.14 0.02 0

IEC VI 13.5 1.0 0

IEC EI 80.0 2.0 0

IEC LTI 120.0 1.0 0

ANSI MI 0.0515 0.02 0.114

ANSI VI 19.61 2.0 0.491

ANSI EI 28.2 2.0 0.1217


-32-

Directional element

The phase angle difference of input current and voltage of the directional element

is 90 , and the operation range is 85±lmφ . There are three separate directional elements.

lmφ is positive when voltage is leading to current.

850

bcU⋅

aI⋅

045−=lmϕ

850

bcU⋅

aI⋅

0135=lmϕ

a) Direction to transformer b) Direction to system

Figure 16: Phase-phase directional element characteristic

The directional element can be enabled via binary setting “DIR ON” (1-On, 0-Off), and

the forward direction can be selected via binary setting “DIR TO SYS” (1-direction to

system, 0-direction to transformer). In order to avoid the voltage dead zone for three-

phase fault at relay location, the memory voltage is used for directional element. Every

definite stage and IDMTL has separate binary setting to select whether direction is put on

and the direction of the directional element. The directional element voltage of every side

use the voltage on itself side.

Note: lmφ =-45º represents the voltage is lagging by current.

The logic for Definite and IDMTL overcurrent protection is shown in Fig. 17.

OC Trip

O/C ON

&I>Iset

T

O/C DIR ON

VT failure &

DIR Positive

IDMTL OC Trip

IDMTL O/C ON

&Inverse Curve>

T

IDMTL DIR ON

VT failure &

DIR Positive

Fig.17: Tripping logic for definite and IDMTL overcurrent protection.


-33-

5.4.2 Settings of definite and IDMTL overcurrent protection

Table 20: Setting of definite and IDMTL overcurrent protection


options

Default

settingComment

1 HV OC I1> 0.1…100 100Overcurrent (OC) setting for 1st stage( I1> )

2 T HV OC I1> 0.1…20s 20 Timer setting for 1st stage OC

3 HV OC I2> 0.1…100 100Overcurrent (OC) setting for 2nd stage( I2> )

4 T HV OC I2> 0.1…20s 20 Timer setting for 2nd stage OC

5IDMTL HV OC

TimeMult0.025...2.0 1

6IDMTL HV OC

CONST A0.0…130.0 20

7IDMTL HV OC

POWER P0.02...2.0 2

8IDMTL HV OC PARA

B0.0…1.0 0

9 IDMTL HV OC I> 0.1…100A 5

Ref to IEC and ANSI Curves

10 HV OC_1 ON 1/0 01st stage(_1) Overcurrent (OC) in HVside on

11 HV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st

Stage(_1) of Overcurrent (OC) in HVside

12HV OC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1)Overcurrent (OC)to system nottransformer itself in HV side

13 HV OC_2 ON 1/0 02nd stage(_2) Overcurrent (OC) in HVside on

14 HV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd

Stage(_2) of Overcurrent(OC) in HVside

15HV OC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2)Overcurrent (OC) to system nottransformer itself in HV side

16 HV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in HV side on

17HV IDMTL OC DIR

ON1/0 0

Direction (DIR) detection of IDMTLOvercurrent (OC) in HV side

18HV IDMTL OC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Overcurrent(OC)to system not transformer itselfin HV side

19 MV OC I1> 0.1…100 100Overcurrent (OC) setting for 1st stage( I1> )

20 T MV OC I1> 0.1…20s 20 Timer setting for 1st stage OC

21 MV OC I2> 0.1…100 100Overcurrent (OC) setting for 2nd stage( I2> )

22 T MV OC I2> 0.1…20s 20 Timer setting for 2nd stage OC

23IDMTL MV OC

TimeMult0.025…2.0 1 Ref to IEC and ANSI Curves


-34-

24IDMTL MV OC

CONST A0.0…130.0 20

25IDMTL MV OC

POWER P0.02…2.0 2

26IDMTL MV OC PARA

B0.0…1.0 0

27 IDMTL MV OC I> 0.1…100A 5

28 MV OC_1 ON 1/0 01st stage(_1) Overcurrent (OC) withtime delay T in MV side on

29 MV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st

Stage(_1) of Overcurrent(OC) in MVside

30MV OC_1 DIR TO

SYS1/0 0

direction (DIR) of 1st stage (_1)Overcurrent (OC)to system nottransformer itself in MV side

31 MV OC_2 ON 1/0 02nd stage(_2) Overcurrent (OC) withtime delay T in MV side on

32 MV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd

Stage(_2) of Overcurrent(OC) in MVside

33MV OC_2 DIR TO

SYS1/0 0

direction (DIR) of 2nd stage (_2)Overcurrent (OC)to system nottransformer itself in MV side

34 MV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in MV side on

35MV IDMTL OC DIR

ON1/0 0

Direction (DIR) detection of IDMTLOvercurrent(OC) in MV side

36MV IDMTL OC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Overcurrent(OC)to system not transformer itselfin MV side

37 LV OC I1> 0.1…100 100Overcurrent (OC) setting for 1st stage(I1>)

38 T LV OC I1> 0.1…20s 20 Timer setting for 1st stage OC

39 LV OC I2> 0.1…100 100Overcurrent (OC) setting for 2nd stage(I2>)

40 T LV OC I2> 0.1…20s 20 Timer setting for 2nd stage OC

41IDMTL LV OC

TimeMult0.025...2.0 1

42IDMTL LV OC

CONST A0.0…130.0 20

43IDMTL LV OC

POWER P0.02…2.0 2

44IDMTL LV OC PARA

B0.0…1.0 0

45 IDMTL LV OC I 0.1…100A 5


46 LV OC_1 ON 1/0 01st stage(_1) of Overcurrent (OC) in LVside on

47 LV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st

Stage(_1) of Overcurrent(OC) in LVside


-35-

48LV OC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1)Overcurrent (OC)to system nottransformer itself in LV side

49 LV OC_2 ON 1/0 02nd stage(_2) of Overcurrent (OC) in LVside on

50 LV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd stage(_2) of Overcurrent(OC) in LV side

51LV OC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2)Overcurrent (OC)to system nottransformer itself in LV side

52 LV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in LV side on

53LV IDMTL OC DIR

ON1/0 0

Direction (DIR) detection of IDMTLOvercurrent(OC) in LV side

54LV IDMTL OC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Overcurrent(OC)to system not transformer itselfin LV side

5.5 Definite and IDMTL Neutral current protection unit


This protection function is a backup protection for the transformer and the power

system. The protection comprises 2 stages definite residual current 3I0> and 1 stage

IDMTL neutral current. The integrated directional function can be applied to the neutral

current protection via binary settings.

This protection is only using as backup protection for transformer and adjacent

element for ground fault in directly earthed system. This function is offered in every side of

the transformer.

Zero sequence overcurrent element

Zero sequence overcurrent element calculated by three phase current for every side.

setII 00 33 > (5-12)

Where, setI 03 - setting of zero sequence overcurrent.

IDMTL neutral current element

IDMTL neutral current curves are same to IDMTL overcurrent curves, it is reference to

IDMTL overcurrent.

Zero sequence directional element

Voltage and current for zero sequence directional elements all are calculated by three

phase quantity. The maximum sensitive angle lmφ is -100°. The operation range is 80±lmφ .

The forward direction can be selected with control word as pointing to the transformer or

system.


-36-

800

03⋅

U

03⋅

I

080=lmϕ

800

03⋅

U

03⋅

I

0100−=lmϕ

a) Direction to transformer b) Direction to system

Figure 18: Characteristic of zero sequence direction elements

The logic for Definite and IDMTL overcurrent protection is shown in Fig.19.

NC Trip

N/C ON

&3I0>3I0set

T

N/C DIR ON

VT failure &

DIR Positive

IDMTL NC Trip

IDMTL N/C ON

&Inverse Curve>

T

IDMTL DIR ON

VT failure &

DIR Positive

Fig.19: Tripping logic for definite and IDMTL neutral current protection

5.5.2 Settings of definite and IDMTL neutral current protection

Table 21: Setting of definite and IDMTL neutral current protection


options

Default

settingComment

1 HV NC I01> 0.1…100 100Neutral Current (NC) setting for 1st

stage ( I01> )

2 T HV NC I01> 0.1…20s 20 Timer setting for 1st stage NOC

3 HV NC I02> 0.1…100 100Neutral Current (NC) setting for 2nd

stage ( I02> )

4 T HV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

5IDMTL HV NC

TimeMult0.025..2.0 1

6IDMTL HV NC CONST

A0.0…130.0 20

7IDMTL HV NC POWER

P0.02...2.0 2

8 IDMTL HV NC PARA B 0.0…1.0 0



-37-

9 IDMTL HV NC I0> 0.1…100A 5

10 HV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) inHV side on

11 HV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) inHV side on

12 HV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st

stage(_1) Neutral Current (NC) inhigh voltage (HV)side on

13 HV NC_1 DIR TO SYS 1/0 0Direction (DIR) of 1st stage (_1)Neutral Current (NOC)to system nottransformer itself in HV side

14 HV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd stage(_2) Neutral Current (NC) in highvoltage (HV)side on

15 HV NC_2 DIR TO SYS 1/0 0Direction (DIR) of 2nd stage (_2)Neutral Current (NC)to system nottransformer itself in HV side

16 HV IDMTL NC ON 1/0 0IDMTL Neutral Current (NC) in HVside on

17 HV IDMTL NC DIR ON 1/0 0Direction(DIR) detection of IDMTLNeutral Current (NC) in high voltage(HV)side on

18HV IDMTL NC DIR TO

SYS1/0 0

Direction (DIR) of IDMTL NeutralCurrent (NC)to system nottransformer itself in HV side

19 MV NC I01> 0.1…100 100Neutral Current (NC) setting for 1st

stage (I01>)

20 T MV NC I01> 0.1…20s 20 Timer setting for 1st stage NOC

21 MV NC I02> 0.1…100 100Neutral Current (NC) setting for 2nd

stage (I02>)

22 T MV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

23IDMTL MV NC

TimeMult0.025...2.0 1

24IDMTL MV NC CONST

A0.0...130.0 20

25IDMTL MV NC POWER

P0.02…2.0 2

26 IDMTL MV NC PARA B 0.0…1.0 0

27 IDMTL MV NC I0> 0.1...100A 5


28 MV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) inMV side on

29 MV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) inMV side on

30 MV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st

stage(_1) Neutral Current (NC) inMV side on

31 MV NC_1 DIR TO SYS 1/0 0Direction (DIR) of 1st stage (_1)Neutral Current (NOC)to system nottransformer itself in MV side


-38-

32 MV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd

stage(_2) Neutral Current (NC) inMV side on

33 MV NC_2 DIR TO SYS 1/0 0Direction (DIR) of 2nd stage (_2)Neutral Current (NC)to system nottransformer itself in MV side

34 MV IDMTL NC ON 1/0 0IDMTL Neutral Current (NC) in MVside on

35 MV IDMTL NC DIR ON 1/0 0Direction(DIR) detection of IDMTLNeutral Current (NC) in high voltage(MV)side on

36MV IDMTL NC DIR TO

SYS1/0 0

Direction (DIR) of IDMTL NeutralCurrent (NC)to system nottransformer itself in MV side

37 LV NC I01> 0.1…100.0 100Neutral Current (NC) setting for 1st

stage (I01>)

38 T LV NC I01> 0.1…20s 20 Timer setting for 1st stage NOC

39 LV NC I02> 0.1…100 100Neutral Current (NC) setting for 2nd

stage (I02>)

40 T LV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

41 IDMTL LV NC TimeMult 0.025...2.0 1

42 IDMTL LV NC CONST A 0…130 20

43 IDMTL LV NC POWER P 0.02...2.0 2

44 IDMTL LV NC PARA B 0.0…1.0 0

45 IDMTL LV NC I0> 0.1…100A 5


46 LV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) inLV side on

47 LV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st

stage(_1) Neutral Current (NC) inhigh voltage (LV)side on

48 LV NC_1 DIR TO SYS 1/0 0Direction (DIR) of 1st stage (_1)Neutral Current (NOC)to system nottransformer itself in LV side

49 LV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) inLV side on

50 LV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd

stage(_2) Neutral Current (NC) inhigh voltage (LV)side on

51 LV NC_2 DIR TO SYS 1/0 0Direction (DIR) of 2nd stage (_2)Neutral Current (NC)to system nottransformer itself in LV side

52 LV IDMTL NC ON 1/0 0IDMTL Neutral Current (NC) in LVside on

53 LV IDMTL NC DIR ON 1/0 0Direction(DIR) detection of IDMTLNeutral Current (NC) in high voltage(LV)side on

54LV IDMTL NC DIR TO

SYS1/0 0

Direction (DIR) of IDMTL NeutralCurrent (NC)to system nottransformer itself in LV side


-39-

5.6 Neutral displacement protection unit


This protection is often used for the transformer which the neutral is not earthed. The

protection comprises 2 stage 3U0>, 1st stage for alarming, 2nd stage for tripping. This

function is offered in every side of the transformer.

For HV and MV side, neutral displacement protection adopts the open delta voltage.

For LV side, neutral displacement protection adopts the zero sequence voltage calculated

by three-phase voltage.

3U0 Alarm

3U0> Alarm ON

&3U0> T1

3U0 Trip

3U0> Trip ON

&3U0> T2

Fig.20: Tripping logic for neutral displacement protection

The logic for neutral displacement protection is shown in Fig. 20.

5.6.2 Settings of neutral displacement protection

Table 22: Setting of neutral displacement protection


options

Default

settingComment

1 HV 3U0> ALARM 2.0…300.0 300Neutral voltage setting for alarmingstage

2 T HV 3U0> ALARM 0.1…20s 20 Timer setting for neutral voltage

3 HV 3U0> TRIP 2.0…300.0 300Neutral voltage setting for trippingstage

4 T HV 3U0> TRIP 0.1…20s 20 Timer setting for neutral voltage

5 HV 3U0> ALARM ON 1/0 0Neutral displacement (3U0) alarm inHV side on

6 HV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in HVside on

7 MV 3U0> ALARM 2.0…300.0 300Neutral voltage setting for alarmingstage

8 T MV 3U0> ALARM 0.1…20s 20 Timer setting for neutral voltage

9 MV 3U0> TRIP 2.0…300.0 300Neutral voltage setting for trippingstage

10 T MV 3U0> TRIP 0.1…20s 20 Timer setting for neutral voltage

11 MV 3U0> ALARM ON 1/0 0Neutral displacement (3U0) alarm inMV side on

12 MV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in MVside on

13 LV 3U0> ALARM 2.0…300.0 300Neutral voltage setting for alarmingstage

14 T LV 3U0> ALARM 0.1…20s 20 Timer setting for neutral voltage


-40-

15 LV 3U0> TRIP 2.0…300.0 300Neutral voltage setting for trippingstage

16 T LV 3U0> TRIP 0.1…20s 20 Timer setting for neutral voltage

17 LV 3U0> ALARM ON 1/0 0Neutral displacement (3U0) alarm in LVside on

18 LV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in LVside on

5.7 Thermal overload protection unit


Transformer design has changed, with less and less metal being used per MVA of

transformed power. This has reduced the withstand time a transformer can be allowed to

be run in an overloaded state. It is becoming more important to provide an additional

thermal protection to supplement the Winding Temperature device.

Thermal overload protection characteristic is provided as THERMAL IEC 60255-8. There

are IEC cold and IEC hot curves.

The cold curve is:

−=

22

2

ln

θ

τII

It

eq

eq (5-13)

The hot curve is:

−

−−=

22

22 )/1(ln

θ

τII

ICHIt

eq

Peq (5-14)

Where, t - thermal trip time;

eqI - equivalent thermal current, ( )CBAeq IIII ++=3

1 ;

τ - thermal time constant;

θI - rms thermal current setting;

( CH /1− ) - hot spot weighting factor;

PI - prior current takes into account cyclic loading.

When the thermal overload is accumulated to 80% of the total thermal ability, the

alarm report “TEM Alarm” will be given.

5.7.2 Settings of thermal overload protection

Table 23: Setting of thermal overload protection


options

Default

settingComment

1 HV TEM OLD I> 0.1...25.0 2 Setting for thermal overload

2HV TEM OLD Time

Const0…9000s 10

Time constant for thermal overloadprotection

3HV Weight Factor

H/C0.0...1.0 0 Hot cool weight factor H/C

4 HV TEM OLD ON 1/0 0 Thermal overload in HV side on


-41-

5.8 Pole discordance protection unit


Pole discordance protection evaluates current components and the circuit-breaker

auxiliary contact. The contact for circuit breaker pole discordance is shown in Fig.21.

(NO_PhA means normal open contact for phase A/B/C; NC_PhA means normal close

contact for phase A, the contact definition for phase B and C are same as phase A)

NO_PhA

NO_PhB

NO_PhC

NC_PhA

NC_PhB

NC_PhC To DI PD

Fig 21. Contact connection for circuit breaker pole discordance

The components include negative sequence current I2> and zero sequence current

3I0>. It can be started by external via digital input.

Pole discordance protection is provided for HV CB1, HV CB2 and MV CB.

The logic for pole discordance protection is shown in Fig. 22.

CB PD TripCB PD DI

&

CB PD ON

1≥

CUR ELE ON

&

1≥

I2>I2set

3I0>I0set

T

Fig.22: Tripping logic for circuit breaker pole discordance protection

If digital input for CB PD is existing, all three phase current are larger than a threshold(fixed in the software, for 1A CT, the threshold is 0.06A; for 5A CT, the threshold is 0.3A.),and the delay time is fixed 10 seconds. “DI PD Alarm” report will be given to remind userto detect auxiliary contact and CT circuit.

The logic for pole discordance contact alarm is shown in Fig.23.

DI PD Alarm

CB PD DI

&

CB PD ON

10s

IB>Iset

IA>Iset

IC>Iset

Fig.23: Digital Input Alarm logic for circuit breaker pole discordance protection

5.8.2 Settings of pole discordance protection

Table 24: Setting of pole discordance protection


-42-

N

oSetting Title

Setting

options

Default

settingComment

1 HV CB PD 3I0> 0.1...100 100Zero sequence current setting of Circuit breakerpole discordance

2 HV CB PD I2> 0.1…100 100negative sequence current setting of Circuitbreaker pole discordance

3 T HV CB PD 0.1…20s 20 Timer setting for circuit breaker pole discordance

4 HV CB PD ON 1/0 0Circuit break(CB) pole discordance (PD) in HVside on

5HV CB PD CUR

ELE ON1/0 0

Circuit break(CB) pole discordance (PD)withCurrent (CUR)element(ELE) in HV side on

6 HV CB2 PD 3I0> 0.1…100 100Zero sequence current setting of Circuit breakerpole discordance

7 HV CB2 PD I2> 0.1…100 100negative sequence current setting of Circuitbreaker pole discordance

8 T HV CB2 PD 0.1…20s 20 Timer setting for circuit breaker pole discordance

9 HV CB2 PD ON 1/0 0Circuit break(CB) pole discordance (PD) in HVside 2 on

10HV CB2 PD CUR

ELE ON1/0 0

Circuit break(CB) pole discordance (PD)withCurrent (CUR)element(ELE) in HV side 2 on

11 MV CB PD 3I0> 0.1…100 100Zero sequence current setting of Circuit breakerpole discordance

12 MV CB PD I2> 0.1…100 100negative sequence current setting of Circuitbreaker pole discordance

13 T MV CB PD 0.1…20s 20 Timer setting for circuit breaker pole discordance

14 MV CB PD ON 1/0 0Circuit break(CB) pole discordance (PD) in MVside on

15MV CB PD CUR

ELE ON1/0 0

Circuit break(CB) pole discordance (PD)withCurrent (CUR)element(ELE) in MV side on

5.9 Other auxiliary protection unit


Other auxiliary protections are provided. For example, overload protection, overcurrent

blocking voltage regulation protection etc. The overload protection is to protect all sides of

windings of transformer continuous overload currents. The protection only comprises a

definite time alarm stage. Overcurrent blocking voltage regulation protection is to judge

whether the voltage tap changer can be regulated or not, if the current more than the

setting “BLK VOL REGU I>”, the contact is given to block the tap changer regulation

device. Overload and overcurrent blocking voltage regulation protection use the maximum

current element of three phases.

The logic for overload and the overcurrent blocking voltage regulation protection is

shown in Fig.24.


-43-

Load AlarmOLD ON&

Max(IA,IB,IC)>Iset

T

BLK VOL REGUBLK VOL REGU ON&

Max(IA,IB,IC)>Iset

T

Fig.24: The logic for overload and overcurrent blocking voltage regulation protection

Negative imbalance detection function is for detect negative current for every side.

The setting “HV1 I2 DET ON ”,” HV2 I2 DET ON”, “MV I2 DET ON” and ” LV I2 DET ON” are

provided to enable or disable the negative current detection function of every side. One

delay time setting is common for every side. The logic is shown in Fig.25.

I2 AlarmI2 DET ON&

I2>I2.set

T

Fig.25: The logic for negative imbalance detection protection

External digital input operated record disturbance functions are also provided.

5.9.2 Settings of other auxiliary protection

Table 25: Setting of pole discordance protection


options

Default

settingComment

1 HV LOAD I> 0.1…100.0 100 Overcurrent Setting of overload

2 T HV LOAD I> 0.1…3600s 20 Timer setting for overload

3 HV OLD ON 1/0 0 Overload (LOAD)in HV side on

4HV BLK VOL

REG I>0.1…100.0 100

Overcurrent Setting of blocking voltageregulation

5T HV BLK VOL

REGU I>0.1…3600s 20 Timer setting for blocking voltage regulation

6HV BLK VOL

REGU ON1/0 0

Blocking(BLK) voltage(VOL) regulation (REGU)inHV side on

7 MV LOAD I> 0.1...100.0 100 Overcurrent Setting of overload

8 T MV LOAD I> 0.1…3600s 20 Timer setting for overload

9 MV OLD ON 1/0 0 Overload (LOAD)in MV side on

10MV BLK VOL

REGU I>0.1...100.0 100

Overcurrent Setting of blocking voltageregulation

11T MV BLK VOL

REGU I>0.1…3600s 20 Timer setting for blocking voltage regulation

12MV BLK VOL

REGU ON1/0 0

Blocking(BLK) voltage(VOL) regulation (REGU)inMV side on

13 LV LOAD I> 0.1...100.0 100 Overcurrent Setting of overload

14 T LV LOAD I> 0.1…3600s 20 Timer setting for overload

15 LV OLD ON 1/0 0 Overload (LOAD)in LV side on


-44-

16 LWIND OLD I> 0.1...100.0 100Overcurrent Setting of overload for winding indelta

17T LWIND OLD

I>0.1…3600s 20 Timer setting for overload

18 LWIND OLD ON 1/0 0 Winding(WIND) Overload(LOAD) in LV side on

5.10 VT failure


VT failure includes three phase VT failure element and single or two phase VT failure

element.

1) 3 phases VT failure element: voltages of three phases all are under 18V and current

of any phase is larger than threshold (fixed in the software, for 1A CT, the threshold is

0.06A; for 5A CT, the threshold is 0.3A.), confirm three VT failure over 10s. The logic for 3

phases VT failure is shown in Fig.26.

VT Fail

&

10s

UB<18V

UA<18V

UC<18V

IB>Iset

IA>Iset

IC>Iset

>=1

&

Fig.26: The logic for 3 phases VT failure.

2) 1 or 2 phases VT failure element: If 03U added by three phase voltage is larger

than 18V and three phase-phase voltages are not equal, difference between two phase-

phase voltage is larger than 18V(in order to discriminate ground fault in indirectly earthed

system), confirm VT failure over 10s. The logic for one or two phase VT failure is shown in

Fig.27.

VT Fail

>=1

10s

|UBC-UCA|>18V

|UAB-UBC|>18V

|UCA-UAB|>18V &

VUUU CBA 18>++ ɺɺɺ

Fig.27: The logic for 1or 2 phases VT failure.

6 Operation

6.1 Safety precautions

During the equipment tests and start-up, the general safety regulations applicable to

electrical systems must be complied with. Failure to comply with these regulations might

cause harm to the working staff and damage to property. All the inspections and tests

must only be carried out by specially trained personnel.

• Check the enclosure shell has been grounded reliably and maintain electric

continuity to earth.

• The general safety regulations applicable to equipments must be strictly complied


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with.

• Insert or pull out models must be strictly prohibit during the equipment tests and

operation.

• During operation, nobody is allowed to press the keyboard on the panel optionally.

• During operation, nobody is allowed to operate the following commands:

Burst into drive.

Modification and solidify settings.

Set up numbers of running CPU.

Change setting group.

Change equipment address in communication net.

6.2 Dialog with the equipment

6.2.1 Menu frame

Table 26 is the menu frame about the Man-Machine Interface (MMI).

Table 26: Menu frame for MMI

Abbr.

(LCD Display)Meaning

Remarks

OpStatus Operating Status

AI Analog Input Inspecting the analog input of the equipment.

Status Equipment Status Inspecting the equipment status.

Version Version Showing the version information of the CPU inthe equipment.

EquipCode Equipment Code Showing the code information of any modulein the equipment.

DI Digital Input Inspecting the status of digital inputs.

Measure Measuring Values Showing the measure quantities of theequipment (the value of the current has beenaltered basing on the CT adjustingcoefficient).

Settings Settings SetupCommPara

BayName Name of Bay Unit Inputting the name of the primary power unitwith ISN (internal statement number).

CommAddr CommunicationAddress

Setting the address of the LON-NET.

TimeMode Timing Mode

BaudR485 Baud Rate of 485

EquipPara Equipment Parameter Setting the equipment parameter.

ProtSet Protection Setting the equipment setting.

ProtContWd

QueryRep

EventRpt Event Report

Latest Rpt The latest report Listing the time of the latest operating report,inspecting the content by pressing the SETkey.

Last 6 Rpts Last 6 reports Listing the time of the latest six operating

report, selecting the report with ∆ and ∇


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key, inspecting the content with SET key.

QueryRpt by Date Query report by date Listing the time of the operating reports whichis searched by time sect, selecting the report

with ∆ and ∇ key, inspecting the content bypressing the SET key.

StartRpt Startup Report

Latest Rpt The latest report Listing the time of the latest starting report,inspecting the content by pressing SET key.

Last 6 Rpts Last 6 reports Listing the time of the latest six starting

reports, selecting the report with ∆ and ∇key, inspecting the content with SET key.

QueryRpt by Date Query report by date Listing the time of the starting reports whichis searched by time sect, selecting the report

with ∆ and ∇ key, inspecting the contentwith SET key.

AlarmRpt Alarm Report

Last 6 Rpts Last 6 reports Listing the time of the latest six alarm


QueryRpt by Date Query report by date Listing the time of the alarm reports which issearched by time sect, selecting the report


Log Operating Log

Last 6 Rpts Last 6 reports Listing the time of the latest six running


QueryRpt by Date Query report by date Listing the time of the running reports whichis searched by time sect, selecting the report


Setup Equipment Setup

SOEReset SOE Reset Option

Automatic Reset Automatic Reset

Manual Reset Manual Reset

Manual resetting or automatic resetting.

Protocol Protocol Option

V1.20 Protocol Communication ProtocolV1.20

V1.10 Protocol Communication ProtocolV1.10

Choosing the protocol for the equipmentcommunication with exterior V1.20 or V1.10.The bright option is the current setup, select

the protocol with ∆ and ∇ key, set up it bypressing SET key.

ModifyPW Modify Password Modifying operation password.

SetPrint Print Setup

RecPrt Setup Setup for print recordvalues

The user can choose AC channels and Binaryrecord message.

Print Mode Setup for print mode Setting print mode, which can be figure ordata mode.

103Type 103 Protocol Select Setting the type of function 103.

Print Print

ProtSet Protection Setting Printing setting.


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Report Report

EventRpt Event Report

Latest Rpt The latest report Listing the time of the latest operating report,inspecting the content with pressing the SETkey.

Last 6 Rpts Last 6 reports Listing the time of the latest six operating


QueryRpt by Date Query report by date Listing the time of the operating reports whichis searched by time sect, selecting the report

with ∆ and ∇ key, inspecting the contentwith SET key.

StartRpt Startup Report

Latest Rpt The latest report Listing the time of the latest starting report,inspecting the content by pressing the SETkey.

Last 6 Rpts Last 6 reports Listing the time of the latest six starting


QueryRpt by Date Query report by date Listing the time of the starting reports whichis searched by time sect, selecting the report


AlarmRpt Alarm Report

Last 6 Rpts Last 6 reports Listing the time of the latest six-alarm report,

selecting the report with ∆ and ∇ key,inspecting the content with SET key.

QueryRpt by Date Query report by date Listing the time of the alarm reports which issearched by time sect, selecting the report


Log Operating Log

Last 6 Rpts Last 6 reports Listing the time of the latest six running

report, selecting the report with ∆ and ∇key, inspecting the content with SET key.

QueryRpt by Date Query report by date Listing the time of the running reports whichis searched by time sect, selecting the report


EquipPara Equipment Parameter Printing equipment parameter.

Setup Equipment Setup Printing equipment setup.

OpStatus Operating Status

AI Analog Input Printing analog input.

Status Equipment Status Printing equipment state.

Version Version Printing the version of CPU in the equipment.

EquipCode Equipment Code Printing equipment code.

DI Digital Input Printing digital input.

Connector ON/OFF Connector ON/OFF Printing strap state.

PrtSample Print Sampling Data Printing sampling data.

Test DO Digital Output DriveTest

Digital output driving.


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Set Time Set Time

Testing Testing

SimuReSig Simulate Remote Signal

Simu Alarm Simulate Alarm

Simu Trip Simulate Tripping

Simu Connt Simulate Connector

Simu DI Simulate DigitalInput(DI)

Simu Transmit Rec Simulate transmittingrecord data

Simu MST Alarm

SwSetGrp Switch Setting Group

ViewDrift View AI Zero Drift Inspecting the zero shift of specified CPU.

AdjDrift Adjust AI Drift Adjusting the zero shift of all CPU. Choosing

the channels with ∆ and ∇ key, fixing onechannel with SET key, moving the cursor onENSURE and pressing the SET key tocomplete regulating.

ViewScale View AI Scale Inspecting the scale of specified CPU.

AdjScale Adjust AI Scale Adjusting the scale of all CPU. Choosing the

channels with ∆ and ∇ key, fixing onechannel and setting the voltage/current valuewith SET key, moving the cursor on ENSUREand pressing the SET key to completeregulating.

PrtSample Print Sampling Data

Contrast LCD ContrastRegulation

Regulating LCD lightness.

OpConnt Connector Operation

OpSoftConnt Soft Connector ON/OFF

ViewConnt View Connector Status

The operation of switching straps into or outof service.

Table 27: the menu frame of the DebuggingMenu

Abbr.

(LCD Display)Meaning

Remarks

SetCPU Set CPU Setting CPU.

ViewMem View Memory Viewing the memory of the equipment.

ClrConfig Clear Configuration

EquipConfig Equipment Configuration

EquipOpt Equipment Option

LED Set LED Set Setup for LED Type.

ConntMode Connector Mode Setup for Connector mode.

SetLCD_Bkdg Set background LCD Setup for background LCD mode.

MasterVer Master Version Choosing Master version.

6.2.2 Display flowing

The display includes <circular display>, < MainMenu >, < DebuggingMenu >, <the


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message window for active pop-up>.

The equipment circularly displays the analogue quantities and the setting group. There

is the present time on the top of the screen. You can fix one screen of information to be

displayed by pressing QUIT key, and keep on circularly displaying by pressing the QUIT key

again.

The equipment menu includes the MainMenu and the DebuggingMenu.

You can enter the MainMenu by pressing the SET key when the screen is in circularly-

displaying state. You can enter the DebuggingMenu by pressing the QUIT+SET keys (only

for manufacturer).

There are four shortcut keys and two functional keys at the bottom of liquid crystal

screen. The main intention is to predigest user’s manipulation. The descriptions of these

keys are as Table 28.

Table 28: Shortcut key application

Shortcut key Remarks

F1Printing latest tripping event, page down andup function for changing setting screen

F2Printing settings in preset fixed value zone,page down and up function for changingsetting screen

F3 Printing sample values

F4 Printing device information and running status

F5Functional key, current setting group plus1.Note: there are 0,1,2,3 four setting groupstotal

F6Functional key, current setting group minus1.Note: there are 0,1,2,3 four setting groupstotal.

6.3 Annunciations

6.3.1 Event report

Table 29: List of event report

No

.

Abbr.

(LCD Display)Comment

1 Relay Start Relay Startup(Start)

2 Relay Reset Relay Reset (Reset)

3 IDIFF> Trip A

4 IDIFF> Trip B

5 IDIFF> Trip C

Treble slope percent Differential protection (IDIFF>) tripping (Trip)for phase A/B/C

6 IDIFF>> Trip A

7 IDIFF>> Trip B

8 IDIFF>> Trip C

Instantaneous Differential protection (IDIFF>>)tripping (Trip) for

phase A/B/C

9 HV REF Trip HV Restricted Earth fault (REF) protection tripping(Trip)


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10 MV REF Trip MV Restricted Earth fault (REF) protection tripping(Trip)

11 LV REF Trip LV Restricted Earth fault (REF) protection tripping(Trip)

12 HV DEF V/F Trip

13 HV IVR V/F Trip

HV Overflux protection(V/F) tripping (Trip) with definite (DEF) and

inverse(IVR) time characteristic

14 MV DEF V/F Trip

15 MV IVR V/F Trip

MV Overflux protection(V/F) tripping (Trip) with definite (DEF) and

inverse(IVR) time characteristic

16 HV IDMTL OC Trip HV IDMTL Overcurrent(OC) tripping(Trip)

17 HV OC_1 Trip

18 HV OC_2 Trip

Overcurrent protection (OC) stage 1 (_1) or stage 2 (_2) tripping

(Trip) in High Voltage (HV) side with time delay T

19 HV EDIS Trip Phase to Earth Distance (EDIS) tripping in HV side

20 HV DIS_1 Trip

21 HV DIS_2 Trip

Phase to phase Distance (DIS) prot. Stage 1(_1) or Stage 2 (_2)

tripping in HV side with time delay T

22 HV IDMTL NC Trip HV IDMTL Neutral current (NC) tripping(Trip)

23 HV NC_1 Trip

24 HV NC_2 Trip

Neutral Current protection (NC) Stage 1 (_1) or Stage 2 (_2)

tripping (Trip) in High Voltage (HV) side with time delay T.

25 HV 3U0 TRIP Neutral displacement (3U0)protection tripping (Trip) in HV side

26 HV TEM OVLD Trip HV Thermal (TEM) Overload(OVLD) tripping (Trip)

27 MV IDMTL OC TRIP MV IDMTL Overcurrent(OC) tripping(TRIP)

28 MV OC_1 Trip

29 MV OC_2 Trip


(Trip) in Middle Voltage (MV) side with time delay T

30 MV EDIS Trip Phase to Earth Distance(EDIS) protection tripping in MV side

31 MV DIS_1 Trip

32 MV DIS_2 Trip

Phase to phase Distance (DIS) prot. Stage 1(_1) or Stage 2(_2)

tripping in MV side with time delay T

33 MV IDMTL NC Trip MV IDMTL Neutral current (NC) tripping(TRIP)

34 MV NC_1 Trip

35 MV NC_2 Trip

Neutral Current protection (NC) Stage 1 (_1) or Stage 2 (_2)

tripping (Trip) in Middle Voltage (HV) side with time delay T.

36MV 3U0 Trip

Neutral displacement (3U0)protection tripping (Trip) in MV sidewith time delay T

37 MV TEM OVLD Trip MV Thermal (TEM) Overload(OVLD) tripping (Trip)

38 LV IDMTL OC Trip LV IDMTL Overcurrent(OC) tripping(Trip)

39 LV OC_1 Trip

40 LV OC_2 Trip


(Trip) in Low Voltage (LV) side with time delay T

41 LV IDMTL NC Trip LV IDMTL Neutral current (NC) tripping(Trip)

42 LV NC_1 Trip

43 LV NC_2 Trip

Neutral Current protection (NC) Stage 1 (_1) or Stage 2 (_2)tripping (Trip) in Low Voltage (LV) side with time delay T.

44 LV 3U0 Trip Zero sequence voltage (3U0) protection tripping (Trip) in LV side

45 LV TEM OVLD Trip LV Thermal (TEM) Overload(OVLD) tripping (TRIP )

46 HV Neu IDMTL HV Neutral current IDMTL


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47 MV Neu IDMTL MV Neutral current IDMTL

48 HV CB1 PD Trip

49 MV CB2 PD Trip

Circuit-Breaker (CB) Pole discordance(PD) protection tripping(Trip)in HV side with time delay T.

50 MV CB PD Trip Circuit-Breaker (CB) Pole discordance(PD) protection tripping(Trip)in MV side with time delay T.

51 REF Optd Restricted Earth Fault protection operated disturbance record

52 TRAFO Trip TRAFO BUCH Trip disturbance record

53 WTI High Trip Winding Temperature Indicator High Trip disturbance record

54 OTI High Trip Oil Temperature Indicator High Trip disturbance record

55 PRD Trip Pressure Release Trip disturbance record

56 OLTC Trip OLTC Trip disturbance record

57 BUCH Alarm BUCH Alarm disturbance record

58 WTI High Alarm Winding Temperature Indicator High Alarm disturbance record

59 OTI High Alarm Oil Temperature Indicator High Alarm disturbance record

60 LowOilLevelAlarm Low Oil Level Alarm disturbance record

6.3.2 Alarm report

The following is the illustration for device alarm message.

1) Alarm I is severe alarm. When alarm I happens, the alarm lamp on the front panel

of the device will flash, all of protection function will be switched out of service and the trip

power of protection will be blocked by the device.

2) Alarm II is other alarm. When alarm II happens, the alarm lamp on the front panel

of the device will light continuously, and the device will alarm the corresponding abnormal

status (for example, the circuit-breaker failure startup digital input is abnormal), and will

not block the trip power of protection.

The alarm messages and alarm types are as Table 30.

Table 30: List of alarm report

No. Abbr.

(LCD Display)Comment Alarm I/II

1Sampling Err Sampling data of analog input (AI) are

error.Alarm I

2 EquipPara Err Equipment parameter is error. Alarm I

3 ROM Verify ErrCRC verification to sum of ROM of CPUis error.

Alarm I

4 Setting Err Setting value is error Alarm I

5 Set Group Err Pointer of setting group is error Alarm I

6 DO No Response Digital output (DO) has no response. Alarm I

7 DO Breakdown Digital output (DO) is of breakdown. Alarm I

8 DI Err Digital input (DI) is error. Alarm II

9 SysConfig Err System configuration is error. Alarm I

10 CAN Comm Fail CAN communication failure --


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11 CAN Comm Recover CAN communication Recovery --

12 DI Module Err Digital input (DI) module is error. --

13 DO Module Err Digital output (DO) module is error. --

14 DI Config Err Digital input configuration is error. Alarm II

15 DO Config Err Digital output configuration is error. Alarm I

16 DI Comm Fail Communication failure in digital input(DI)

Alarm II

17DO Comm Fail Communication failure in digital output

(DO)Alarm II

18Test DO Un-reset Digital output (DO)-test has not been

reset.Alarm II

19ConntMdUnconfirm Connector mode has not been

confirmed.Alarm II

20 DI Breakdown Digital input (DI) is of breakdown. Alarm II

21 DI Input Err The input of digital input (DI) is error. Alarm II

22 NO/NC Discord2-position input discordance, i.e. statusof NC and NO discord.

Alarm II

23 DI Check ErrSelf-checking circuit of digital input(DI) is error.

Alarm II

24 DI EEPROM Err EEPROM of digital input (DI) is error. Alarm II

25 DO EEPROM Err EEPROM of digital output (DO) is error. Alarm I

26 SRAM Check Err SRAM self-checking is error. Alarm II

27 FLASH Check Err Flash self-checking is error. Alarm II

28 CT Fail CT failure --

29 DIFF Alarm Imbalance differential current alarm --

30HV REF Alarm HV Imbalance zero differential current

alarm--

31MV REF Alarm MV Imbalance zero differential current

alarm--

32LV REF Alarm LV Imbalance zero differential current

alarm--

33 HV V/F Alarm HV Overflux alarm --

34 MV V/F Alarm MV Overflux alarm --

35 HV VT Fail HV VT failure --

36 H Neu Disp Alarm HV neutral displacement alarm --

37 HV Load Alarm HV overload alarm --

38 HV Blk Vol Regu HV Blocking Voltage Regulation --

39 MV VT Fail MV VT failure --

40 M Neu Disp Alarm MV neutral displacement alarm --

41 MV Load Alarm MV overload alarm --

42 MV Blk Vol Regu MV Blocking Voltage Regulation --

43 LV VT Fail LV VT failure --

44 L Neu Disp Alarm LV neutral displacement alarm --

49 LV Load Alarm LV overload alarm --

50 LW Load Alarm overload in LV delta winding alarm --


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51 DI HV PD Alarm DI for HV CB1 Pole discordance Alarm II

52 DI HV PD2 Alarm DI for HV CB2 Pole discordance Alarm II

53 DI MV PD Alarm DI for MV CB Pole discordance Alarm II

54 HV CB1 On DI for HV CB1 Closed

55 HV CB2 On DI for HV CB2 Closed

56 MV CB On DI for MV CB Closed

57 LV CB On DI for LV CB Closed

58 HV CB1 Off DI for HV CB1 Open

59 HV CB2 Off DI for HV CB2 Open

60 MV CB Off DI for MV CB Open

61 LV CB Off DI for LV CB Open

62 HV TEM Alarm HV Thermal overload Alarm

63HV1 I2 Alarm HV CB1 Imbalance negative current

alarmAlarm II

64HV2 I2 Alarm HV CB2 Imbalance negative current

alarmAlarm II

65MV I2 Alarm MV CB Imbalance negative current

alarmAlarm II

66LV I2 Alarm LV CB Imbalance negative current

alarmAlarm II

6.3.3 Operating report

Table 31: List of operating report

No. Description of event comment

1 SwSetGroup OK Successful to switch setting group.

2 Write Set OK Successful to write setting values.

3 WriteEquipParaOK Successful to write equipment parameter.

4 WriteConfig OK Successful to write configuration.

5 AdjScale OK Successful to adjust scale of analog input (AI).

6 SelfDesc Change Self-description of equipment has changed.

7 Connt ON/OFF OK Successful to switch on/off connector.

8 ClrConfig OK Successful to clear configuration.

9 ChgConntMode Change connector mode

10 InTestMode Enter test mode.

11 OutTestMode Exit test mode.

12 Test DO OK Successful to digital output (DO) drive-test.

13 DI Change Status of digital input (DI) has changed.

14 AdjDrift OK Successful to adjust zero drift of analog input (AI).

15 Not Used Not used.

16 CPU Reset CPU Reset.


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6.4 Testing and commissioning

The test method and report for testing see the documents “CSC-326 Numerical

transformer protection Equipment Test Method (Model 1/2)” and “CSC-326 Numerical

transformer protection Equipment Test Report (Model 1/2)”.

6.5 Putting the equipment into operation

The following items are only provided to be referred. Users should formulate the

corresponding rules for maintenance and operation according to the actual situation in

locale.

a) Check the setting lists inerrably, and then turn on DC power supply. Now the green

light - LED <Run> on panel is lit, other lights are extinguished. Under normal conditions,

LCD display on loop “year-month-day, hour : minute : second, magnitude and phase angle

of analog quantities, channel state, current setting zone: 00. Press SET key to display main

menu. Press one or several times QUIT key9exit current menu one times or step by step to

return normal state of display. Then re-check the clock by turning off DC power and then

on.

b) Connect currents (load current must be larger than 0.1In) and voltages to the

device, under normal state of loop display, press SET key to enter into main menu, then

enter into every sub-menu to check whether the polarity and the phase sequence of each

analog input are correct or not. Verify the sampled data of the protection in accordance

with the actual ones.

c) Check the protection settings. Print each set of settings that are possibly employed

in the actual operating modes, in order to check them with informed sheet of setting and

backup debugging notes.

d) Check the digital inputs in accord with the practical state, and make note. Especially

notice that there is not display of “small hand” on the upper right of LCD under normal

conditions (that means relay test state).

6.6 Configuration of functions

6.6.1 Configuration of functions

CSC-326 provided entire functions for the transformers, any functions can be

configured according to the definite project. The default configuration for CSC-326 series is

shown in table 2.

6.6.2 Settings- equipment parameters

Equipment parameters are shown as table 32.

Table 32: Equipment parameters list

No.Setting Title Setting

options

Default

settingcomments

1 DIFF TRIP 0000...FFFFH 0000HTripping (TRIP)setting for differential(DIFF)protection

2 REF TRIP 0000...FFFFH 0000HTripping (TRIP)setting for Restricted EarthFault(REF) protection of every side

3 V/F TRIP 0000...FFFFH 0000HTripping (TRIP)setting for Overfluxprotection

4 HV BU TRIP 0000…FFFFH 0000HTripping (TRIP)setting for HV Backupprotection

5 MV BU TRIP 0000…FFFFH 0000H Tripping (TRIP)setting for MV Backup


-55-

protection

6 LV BU TRIP 0000…FFFFH 0000HTripping (TRIP)setting for LV Backupprotection

7 HV CB PD TRIP 0000…FFFFH 0000HTripping (TRIP)setting for HV CB1 Polediscordance protection

8 HV CB2 PD TRIP 0000…FFFFH 0000HTripping (TRIP)setting for HV CB2 Polediscordance protection

9 MV CB PD TRIP 0000…FFFFH 0000HTripping (TRIP)setting for MV CB Polediscordance protection

Remark:

1. No.5 “MV BU TRIP” and No 9 “MV CB PD TRIP” are only used for CSC-326(Model 2), forCSC-326(Model 1), these two settings are displayed to “Not Used”.2. All parameter settings can be set by setting 16 bits.

6.6.3 Settings- protection settings

Protection settings are shown in table 33 to table 42.

Table 33: Protection setting list-Common Parameter


options

Default

settingComment Function

1HV WIND

CONN/Y-0 D-10-1 0

Connection for HV winding, 0:wyeconnection, 1:delta connection

2MV WIND

CONN/Y-0 D-10-1 0

Connection for MV winding, 0:wyeconnection, 1:delta connection

3 LV WINDCONN/Y-0 D-1

0-1 1Connection for LV winding, 0:wyeconnection, 1:delta connection

4 VET GRP ANGLE 0-12 11Vector Group Angle( VET GRPANGLE)

5 SN 0...3000MVA 360 Capacity of the transformer

Commonparameters fortransformer

6 HV UN 0...1000 kV 220Nominal voltage (UN) in Highvoltage (HV)side

7 HV VT RATIO 0...9999 2200Voltage transformer(VT) Ratio inHV side

8 HV CT PRI 0...9999A 1200 CT Primary(PRI) current in HV side

9 HV CT SEC 1 OR 5A 1CT Secondary(SEC) current in HVside

Commonparameters forhigh voltageside

10 HV NCT PRI(REF) 0...9999A 1200Neutral CT (NCT) Primary(PRI)current in HV side for REF

11HV NCTSEC(REF)

1 OR 5A 1Neutral CT (NCT) Secondary(SEC)current in HV side for REF

12 HV NCT PRI(BU) 0...9999A 1200Neutral CT (NCT) Primary(PRI)current in HV side for Backup(BU)

13 HV NCT SEC(BU) 1 OR 5A 1Neutral CT (NCT) Secondary(SEC)current in HV side for Backup(BU)

Common earthprotectionparameters forHV side

14 MV UN 0…1000 kV 110Nominal voltage (UN) in Middlevoltage (MV)side

15 MV VT RATIO 0...9999 1100Voltage transformer(VT) Ratio inMV side

16 MV CT PRI 0...9999A 600 CT Primary(PRI) current in MV side

17 MV CT SEC 1 OR 5A 1CT Secondary(SEC) current in MVside

Commonparameters formiddle voltageside


-56-

18 MV NCT PRI(REF) 0...9999A 600Neutral CT Primary(PRI) current inMV side

19MV NCTSEC(REF)

1 OR 5A 1Neutral CT Secondary(SEC)current in MV side

20 MV NCT PRI(BU) 0...9999A 1200Neutral CT (NCT) Primary(PRI)current in MV side for Backup(BU)

21 MV NCT SEC(BU) 1 OR 5A 1Neutral CT (NCT) Secondary(SEC)current in MV side for Backup(BU)

Common earthprotectionparameters forMV side

22 LV UN 0…1000kV 35Nominal voltage (UN) in Lowvoltage (LV)side

23 LV VT RATIO 0...9999 350Voltage transformer(VT) Ratio inLV side

24 LV CT PRI 0…9999A 3000 CT Primary(PRI) current in LV side

25 LV CT SEC 1 OR 5A 1CT Secondary(SEC) current in LVside

26LV CT SEC IN

DELTA1 OR 5A 1

CT Secondary(SEC) current for LVwinding inside delta

Commonparameters forLV side

27 LV NCT PRI(REF) 0…9999A 1200Neutral CT Primary(PRI) current inLV side

28 LV NCT SEC(REF) 1 OR 5A 1Neutral CT Secondary(SEC)current in LV side

29 LV NCT PRI(BU) 0…9999A 1200Neutral CT (NCT) Primary(PRI)current in LV side for Backup(BU)

30 LV NCT SEC(BU) 1 OR 5A 1Neutral CT (NCT) Secondary(SEC)current in LV side for Backup(BU)

Common earthprotectionparameters forLV side

Table 34: Protection setting list–Diff Set


options

Default


1 DIFF ID>> 0.5...100.0A 100Instantaneous Differential (ID>>)current setting

2 DIFF ID> 0.1…100.0A 20Percentage Differential (ID>) currentsetting

3 DIFF IR1 0.1…100.0A 4The 1st breakpoint restraint current(IR1)

4 DIFF IR2 0.1…100.0A 20The 2nd breakpoint restraint current(IR2)

5 DIFF SLOPE 0.2...0.7 0.7 the 2nd slope

6DIFF 2nd HAR

RATIO0.05…0.30 0.15 2nd harmonic(HAR) ratio

7 DIFF 5th HAR RATIO 0.10…0.60 0.35 5th harmonic(HAR) ratio

DIFF

Table 35: Protection setting list–REF Set


options

Default


1 HV REF I> 0.1…10.0A 2 Restricted earth fault setting HV REF


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2 HV REF SLOPE 0.20…0.70 0.5Slope setting for restricted earth faultprotection

3 MV REF I> 0.1…10.0A 2 Restricted earth fault setting

4 MV REF SLOPE 0.20...0.70 0.5Slope setting for restricted earth faultprotection

MV REF

5 LV REF I> 0.1...10.0A 2 Restricted earth fault setting

6 LV REF SLOPE 0.20…0.70 0.5Slope setting for restricted earth faultprotection

LV REF

Table 36: Protection setting list–Overflux Set


options

Default


1 HV Ubase 40.0…100.0 57.3 Nominal phase voltage in HV side

2 HV DEF V/F> Alarm 1.0...1.5 1.1 Alarming setting of volt/herz

3 HV T DEF V/F Alarm 0.1…9999s 10Timer setting for volt/herz alarmingstage

4 HV DEF V/F>> Trip 1.0...1.5 1.2Tripping setting of definite volt/herzstage

5 HV T DEF V/F Trip 0.1…9999s 10Timer setting for definite volt/herzstage








HV V/F

13 MV Ubase 40.0...100.0 57.3 Nominal phase voltage in MV side

14 MV DEF V/F> Alarm 1.0…1.5 1.1 Alarming setting of volt/herz

15 MV T DEF V/F Alarm 0.1…9999s 10Timer setting for volt/herz alarmingstage

16 MV DEF V/F>> Trip 1.0...1.5 1.2Tripping setting of definite volt/herzstage

17 MV T DEF V/F Trip 0.1…9999s 10Timer setting for definite volt/herzstage

18MV T1 IVRV/F=1.10


19MV T2 IVRV/F=1.15


20MV T3 IVRV/F=1.20


21MV T4 IVRV/F=1.25


MV V/F


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22MV T5 IVRV/F=1.30


23MV T6 IVRV/F=1.35


24MV T7 IVRV/F=1.40


Table 37: Protection setting list–HV Backup Set


options

Default


1 HV OC I1> 0.1...100.0 100Overcurrent(OC) setting for 1st stage(I1>)

2 T HV OC I1> 0.1...20s 20 Timer setting for 1st stage OC

3 HV OC I2> 0.1...100 100Overcurrent(OC) setting for 2nd

stage (I2>)

4 T HV OC I2> 0.1…20s 20 Timer setting for 2nd stage OC

5IDMTL HV OC

TimeMult0.025…2.0 1

6IDMTL HV OC CONST

A0.0…130.0 20

7 IDMTL HV OC POWERP

0.02...2.0 2

8 IDMTL HV OC PARA B 0.0…1.0 0

9 IDMTL HV OC I 0.1…100A 5


Definite andIDMTLovercurrentprotection(with selectivedirection) inHigh voltageside

10 HV NC I01> 0.1…100.0 100Neutral Current (NC) setting for 1st

stage (I01>)

11 T HV NC I01> 0.1…20s 20 Timer setting for 1st stage NOC

12 HV NC I02> 0.1…100 100Neutral Current (NC) setting for 2nd

stage (I02>)

13 T HV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

14IDMTL HV NC

TimeMult0.025...2.0 1

15IDMTL HV NC CONST

A0.0…130.0 20

16IDMTL HV NC POWER

P0.02…2.0 2

17 IDMTL HV NC PARA B 0.0…1.0 0

18 IDMTL HV NC I0> 0.1…100A 5


Definite andIDMTL neutralcurrentprotection(with selectivedirection) inHigh voltageside

19 HV 3U0> ALARM 2.0…300.0 300Neutral voltage setting for alarmingstage

20 T HV 3U0> ALARM 0.1…20s 20 Timer setting for neutral voltage

21 HV 3U0> TRIP 2.0…300.0 300Neutral voltage setting for trippingstage

22 T HV 3U0> TRIP 0.1…20s 20 Timer setting for neutral voltage

Neutraldisplacementprotection inHigh voltageside


-59-

23IDMTL HV

NeuTimeMult0.025...2.0 1

24 IDMTL HV NeuConstA 0.0…130.0 20

25 IDMTL HV NeuPowerP 0.02…2.0 2

26 IDMTL HV NeuParaB 0.0…1.0 0

27 IDMTL HV Neu I0> 0.1…100A 5


IDMTL neutralcurrentprotection inHV side

28 HV TEM OLD I> 0.1...25.0 2 Setting for thermal overload

29HV TEM OLD

TimeConst0…9000s 10

Time constant for thermal overloadprotection

30 HV WeightFactor H/C 0.0…1.0 0 Hot cool weight factor H/C

Thermaloverloadprotection

31 HV LOAD I> 0.1…100.0 100 Overcurrent Setting of overload

32 T HV LOAD I> 0.1…3600s 20 Timer setting for overload

Definiteoverloadprotection

33 HV BLK VOL REGU I> 0.1...100.0 100Overcurrent Setting of blockingvoltage regulation

34T HV BLK VOL REGU

I>0.1…3600s 20

Timer setting for blocking voltageregulation

Overcurrentblockingvoltageregulation

Table 38: Protection setting list–MV Backup Set


options

Default


1 MV OC I1> 0.1…100 100Overcurrent (OC) setting for 1st

stage (I1>)

2 T MV OC I1> 0.1…20s 20 Timer setting for 1st stage OC

3 MV OC I2> 0.1…100 100Overcurrent (OC) setting for 2nd

stage (I2>)

4 T MV OC I2> 0.1…20s 20 Timer setting for 2nd stage OC

5 IDMTL MV OC TimeMult 0.025...2.0 1

6 IDMTL MV OC CONST A 0.0...130.0 20

7 IDMTL MV OC POWER P 0.02...2.0 2

8 IDMTL MV OC PARA B 0.0…1.0 0

9 IDMTL MV OC I 0.1…100A 5


Definite andIDMTLovercurrentprotection(withselectivedirection) inMiddlevoltage side

10 MV NC I01> 0.1...100.0 100Neutral Current (NC) setting for 1st

stage (I01>)

11 T MV NC I01> 0.1…20s 20 Timer setting for 1st stage NOC

12 MV NC I02> 0.1…100.0 100Neutral Current (NC) setting for 2nd

stage (I02>)

13 T MV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

14 IDMTL MV NC TimeMult 0.025...2.0 1

15 IDMTL MV NC CONST A 0.0…130.0 20


Definite andIDMTLneutralcurrentprotection(withselectivedirection) inMiddlevoltage side


-60-

16 IDMTL MV NC POWER P 0.02...2.0 2

17 IDMTL MV NC PARA B 0.0…1.0 0

18 IDMTL MV NC I0> 0.1…100A 5

19 MV 3U0> ALARM 2.0…300.0 300Neutral voltage setting for alarmingstage

20 T MV 3U0> ALARM 0.1…20s 20 Timer setting for neutral voltage

21 MV 3U0> TRIP 2.0…300.0 300Neutral voltage setting for trippingstage

22 T MV 3U0> TRIP 0.1…20s 20 Timer setting for neutral voltage

Neutraldisplacementprotectionin Middlevoltage side

23 IDMTL MV NeuTimeMult 0.025...2 1

24 IDMTL MV NeuConstA 0.0...130.0 20

25 IDMTL MV NeuPowerP 0.02...2.0 2

26 IDMTL MV NeuParaB 0.0…1.0 0

27 IDMTL MV Neu I0> 0.1…100A 5


IDMTLneutralcurrentprotectionin MV side

28 MV TEM OLD I> 0.1...25.0 2 Setting for thermal overload

29 MV TEM OLD TimeConst 0...9000s 10Time const for thermal overloadprotection

30 MV WeightFactor H/C 0.0...1.0 0 Hot cool weight factor H/C

Thermaloverloadprotection

31 MV LOAD I> 0.1...100.0 100 Overcurrent Setting of overload

32 T MV LOAD I> 0.1...3600s 20 Timer setting for overload

Definiteoverloadprotection

33 MV BLK VOL REGU I> 0.1...100.0 100Overcurrent Setting of blockingvoltage regulation

34 T MV BLK VOL REGU I> 0.1...3600s 20Timer setting for blocking voltageregulation

Overcurrentblockingvoltageregulation

Remark: all settings for MV Backup protections are used for CSC-326(Model 2), they can not beseen in CSC326 (Model 1) because the functions are not configured.

Table 39: Protection setting list–LV Backup Set


options

Default


1 LV OC I1> 0.1...100 100Overcurrent (OC) setting for 1st

stage (I1>)

2 T LV OC I1> 0.1…20s 20 Timer setting for 1st stage OC

3 LV OC I2> 0.1…100 100Overcurrent (OC) setting for 2nd

stage (I2>)

4 T LV OC I2> 0.1...20s 20 Timer setting for 2nd stage OC

5 IDMTL LV OCTimeMult

0.025...2.0 1

6IDMTL LV OC CONST

A0.0...130.0 20

7IDMTL LV OC POWER

P0.02...2.0 2

8 IDMTL LV OC PARA B 0.0...1.0 0


Definite andIDMTLovercurrentprotection (withselectivedirection) inMiddle voltageside


-61-

9 IDMTL LV OC I 0.1…100A 5

10 LV NC I01> 0.1...100 100Neutral Current (NC) setting for 1st

stage (I01>)

11 T LV NC I01> 0.1...20s 20 Timer setting for 1st stage NOC

12 LV NC I02> 0.1…100 100Neutral Current (NC) setting for 2nd

stage (I02>)

13 T LV NC I02> 0.1…20s 20 Timer setting for 2nd stage NOC

14IDMTL LV NC

TimeMult0.025...2.0 1

15 IDMTL LV NC CONST A 0.0...130.0 20

16IDMTL LV NC POWER

P0.02...2.0 2

17 IDMTL LV NC PARA B 0.0...1.0 0

18 IDMTL LV NC I0> 0.1…100A 5


Definite andIDMTL neutralcurrentprotection (withselectivedirection) inMiddle voltageside

19 LV 3U0> ALARM 2.0...300.0 300Neutral voltage setting for alarmingstage

20 T LV 3U0> ALARM 0.1...20s 20 Timer setting for neutral voltage

21 LV 3U0> TRIP 2.0...300.0 300Neutral voltage setting for trippingstage

22 T LV 3U0> TRIP 0.1...20s 20 Timer setting for neutral voltage

Neutraldisplacementprotection inMiddle voltageside

23 LV LOAD I> 0.1...100 100 Overcurrent Setting of overload

24 T LV LOAD I> 0.1...3600s 20 Timer setting for overload

overloadprotection

25 LWIND OLD I> 0.1...100 100Overcurrent Setting of overload forwinding in delta

26 T LWIND OLD I> 0.1...3600s 20 Timer setting for overload

overloadprotection forwinding indelta

Table 40: Protection setting list–CB PD Set


options

Default


1 HV CB PD 3I0> 0.1...100 100Zero sequence current setting of Circuitbreaker pole discordance

2 HV CB PD I2> 0.1…100 100negative sequence current setting ofCircuit breaker pole discordance

3 T HV CB PD 0.1…20s 20Timer setting for circuit breaker polediscordance

Polediscordancefor Circuitbreaker 1in HV side

4 HV CB2 PD 3I0> 0.1…100 100Zero sequence current setting of Circuitbreaker pole discordance

5 HV CB2 PD I2> 0.1…100 100negative sequence current setting ofCircuit breaker pole discordance

6 T HV CB2 PD 0.1…20s 20Timer setting for circuit breaker polediscordance

Polediscordancefor Circuitbreaker 2in HV side

7 MV CB PD 3I0> 0.1…100 100Zero sequence current setting of Circuitbreaker pole discordance

Polediscordancefor Circuitbreaker inMV side


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8 MV CB PD I2> 0.1…100 100negative sequence current setting ofCircuit breaker pole discordance

9 T MV CB PD 0.1…20s 20Timer setting for circuit breaker polediscordance

Remark: settings (No.7-N0.9) for MV Circuit Breaker Pole discordance protection are used forCSC-326 (Model 2), they can not be seen in CSC326 (Model 1) because the function is notconfigured.

Table 41: Protection setting list–Other Set


options

Default

SettingComment Function

1 HV1 I2 DET SET 0.1...20A 8Setting for HV CB1 imbalance currentdetection

2 HV2 I2 DET SET 0.1…20A 8Setting for HV CB2 imbalance currentdetection

3 MV I2 DET SET 0.1…20A 8Setting for MV CB imbalance currentdetection

4 LV I2 DET SET 0.1…20A 8Setting for LV CB imbalance currentdetection

5 T I2 DET 0.1…20s 5Timer Setting for imbalance currentdetection

Negativeimbalancedetection

Remark: Setting ”MV I2 DET SET”is only used for CSC-326 (Model 2), it can not bedisplayed in CSC326 (Model 1).

Table 42: Protection setting list–Test use Set


options

Default


1 HV RATED CUR PRI HV rated current in primary side

2 HV RATED CUR SEC HV rated current in secondary side

3RATIO FACTOR

KTAHRatio compensation for HV side

4 RATIO FACTORKTAM

Ratio compensation for MV side

5 RATIO FACTOR KTAL

Calculated by softwareaccording to thecommon parametersuser put into thesetting group.

Ratio compensation for LV side

Test forDifferentialprotection

Remarks:

1.These settings are only used for test, they are calculated by software automaticallyaccording to the common parameters. These settings can not be modified by user.

2. Setting ”MV I2 DET SET” is only used for CSC-326 (Model 2), it can not be seen inCSC326 (Model 1).

6.6.4 Settings- Control word setting

Control word settings are shown in table 43.

Table 43: Control word settings


options

Default

settingComment Menu

1 AUTO TRANS 1/0 0Auto-transformer not common transformer1-autotransformer ; 0- not auto-transformer

CommonPara


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2 TWO WIND TRANS 1/0 0

Two-winding(TWO WIND) not three -winding transformer (TRANS)1-two-winding trans; 0-three-windingtrans

31 REF FOR AUTO

TRANS1/0 0

1 REF Function not 2 REF Function, Thissetting is used only for autotransformer1-1REF Function ; 0- 2 REF function

4 IDIFF ON 1/0 0Instantaneous differential (IDIFF)protection ON1-on; 0-off.

5 PDIFF ON 1/0 0Percentage differential (PDIFF) protectionON1-on; 0-off.

62nd HAR NOT

WAVE1/0 0

2nd harmonic (HAR) inhibit not the fuzzyrecognition based on the waveform(WAVE)1-2nd harmonic on; 0- waveform on

7 5th HAR ON 1/0 05th harmonic (HAR) inhibit on1-on; 0-off.

8 DIFF ALARM ON 1/0 0Differential current (DIFF) Alarming on1-on; 0-off.

9 CT FAIL DET ON 1/0 0CT FAIL Detection(DET) on1-on; 0-off.

Diff Set

10 HV REF ON 1/0 0HV Restricted earth fault(REF) ON1-on; 0-off.

11 MV REF ON 1/0 0MV Restricted earth fault(REF) ON1-on; 0-off.

12 LV REF ON 1/0 0LV Restricted earth fault(REF) ON1-on; 0-off.

REF Set

13HV V/F> ALARM

ON1/0 0

HV Definite Overflux (V/F) Alarming on1-on; 0-off.

14HV DEF V/F> TRIP

ON1/0 0

HV Definite (DEF)Overflux (V/F) on1-on; 0-off.

15 HV IVR V/F> ON 1/0 0HV Inverse (IVR)Overflux (V/F) on1-on; 0-off.

16 MV V/F> ALARMON

1/0 0MV Definite Overflux (V/F) Alarming on1-on; 0-off.

17 MV DEF V/F> TRIPON

1/0 0MV Definite (DEF)Overflux (V/F) on1-on; 0-off.

18 MV IVR V/F> ON 1/0 0MV Inverse (IVR)Overflux (V/F) on1-on; 0-off.

OverfluxSet

19 HV OC_1 ON 1/0 01st stage(_1) Overcurrent (OC) in HV sideon

20 HV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st Stage(_1)of Overcurrent(OC) in HV side

21HV OC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1)Overcurrent (OC)to system nottransformer itself in HV side

22 HV OC_2 ON 1/0 02nd stage(_2) Overcurrent (OC) in HV sideon

23 HV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd Stage(_2)of Overcurrent(OC) in HV side

24HV OC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2)Overcurrent (OC)to system nottransformer itself in HV side

25 HV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in HV side on

HVBackup

Set


-64-

26HV IDMTL OC DIR

ON1/0 0

Direction (DIR) detection of IDMTLOvercurrent(OC) in HV side

27 HV IDMTL OC DIRTO SYS

1/0 0

Direction (DIR) of IDMTL Overcurrent(OC)to system not transformer itself inHV side

28 HV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) in HVside on

29 HV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) in HVside on

30 HV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st stage(_1)Neutral Current (NC) in high voltage(HV)side on

31HV NC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1) NeutralCurrent (NOC)to system not transformeritself in HV side

32 HV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd stage(_2)Neutral Current (NC) in high voltage(HV)side on

33HV NC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2) NeutralCurrent (NC)to system not transformeritself in HV side

34 HV IDMTL NC ON 1/0 0 IDMTL Neutral Current (NC) in HV side on

35HV IDMTL NC DIR

ON1/0 0

Direction(DIR) detection of IDMTL NeutralCurrent (NC) in high voltage (HV)side on

36HV IDMTL NC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Neutral Current(NC)to system not transformer itself in HVside

37 HV 3U0> ALARMON

1/0 0Neutral displacement (3U0) alarm in HVside on

38 HV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in HV sideon

39HV NEU IDMTL OC

ON1/0 0 Neutral IDMTL OC in HV side on

40 HV TEM OLD ON 1/0 0 Thermal overload in HV side on

41 HV OLD ON 1/0 0 Overload (LOAD)in HV side on

42HV BLK VOL REGU

ON1/0 0

Blocking(BLK) voltage(VOL) regulation(REGU)in HV side on

43 MV OC_1 ON 1/0 01st stage(_1) Overcurrent (OC) with timedelay T in MV side on

44 MV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st stage(_1)of Overcurrent(OC) in MV side

45MV OC_1 DIR TO

SYS1/0 0

direction (DIR) of 1st stage (_1)Overcurrent(OC) to system nottransformer itself in MV side

46 MV OC_2 ON 1/0 02nd stage(_2) Overcurrent (OC) with timedelay T in MV side on

47 MV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd stage(_2)of Overcurrent(OC) in MV side

48MV OC_2 DIR TO

SYS1/0 0

direction (DIR) of 2nd stage (_2)Overcurrent(OC) to system nottransformer itself in MV side

49 MV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in MV side on

50 MV IDMTL OC DIRON

1/0 0Direction(DIR) detection of IDMTLOvercurrent(OC) in MV side

MVBackup

Set


-65-

51MV IDMTL OC DIR

TO SYS1/0 0

Direction(DIR) of IDMTL Overcurrent(OC)to system not transformer itself in MVside

52 MV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) in MVside on

53 MV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) in MVside on

54 MV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st stage(_1)Neutral Current (NC) in MV side on

55MV NC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1) NeutralCurrent (NOC)to system not transformeritself in MV side

56 MV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd stage(_2)Neutral Current (NC) in MV side on

57 MV NC_2 DIR TOSYS

1/0 0Direction (DIR) of 2nd stage (_2) NeutralCurrent (NC)to system not transformeritself in MV side

58 MV IDMTL NC ON 1/0 0 IDMTL Neutral Current (NC) in MV side on

59MV IDMTL NC DIR

ON1/0 0

Direction(DIR) detection of IDMTL NeutralCurrent (NC) in high voltage (MV)side on

60 MV IDMTL NC DIRTO SYS

1/0 0Direction (DIR) of IDMTL Neutral Current(NC)to system not transformer itself in MVside

61 MV 3U0> ALARMON

1/0 0Neutral displacement (3U0) alarm in MVside on

62 MV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in MV sideon

63MV NEU IDMTL OC

ON1/0 0 Neutral IDMTL OC in MV side on

64 MV TEM OLD ON 1/0 0 Thermal overload in MV side on

65 MV OLD ON 1/0 0 Overload (LOAD)in MV side on

66MV BLK VOL REGU

ON1/0 0

Blocking(BLK) voltage(VOL) regulation(REGU)in MV side on

67 LV OC_1 ON 1/0 01st stage(_1) of Overcurrent(OC) in LV sideon

68 LV OC_1 DIR ON 1/0 0Direction (DIR) detection of 1st stage(_1)of Overcurrent(OC) in LV side

69LV OC_1 DIR TO

SYS1/0 0

Direction (DIR) of 1st stage (_1)Overcurrent(OC) to system nottransformer itself in LV side

70 LV OC_2 ON 1/0 02nd stage(_2) of Overcurrent(OC) in LVside on

71 LV OC_2 DIR ON 1/0 0Direction (DIR) detection of 2nd stage(_2)of Overcurrent(OC) in LV side

72LV OC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2)Overcurrent (OC)to system nottransformer itself in LV side

73 LV IDMTL OC ON 1/0 0 IDMTL Overcurrent (OC) in LV side on

74LV IDMTL OC DIR

ON1/0 0

Direction (DIR) detection of IDMTLOvercurrent(OC) in LV side

75LV IDMTL OC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Overcurrent(OC)to system not transformer itself in LVside

76 LV NC_1 ON 1/0 01st stage(_1) Neutral Current (NC) in LVside on

LVBackup

Set


-66-

77 LV NC_1 DIR ON 1/0 0Direction(DIR) detection of 1st stage(_1)Neutral Current (NC) in high voltage(LV)side on

78 LV NC_1 DIR TOSYS

1/0 0Direction (DIR) of 1st stage (_1)9 NeutralCurrent (NOC)to system not transformeritself in LV side

79 LV NC_2 ON 1/0 02nd stage(_2) Neutral Current (NC) in LVside on

80 LV NC_2 DIR ON 1/0 0Direction(DIR) detection of 2nd stage(_2)Neutral Current (NC) in high voltage(LV)side on

81LV NC_2 DIR TO

SYS1/0 0

Direction (DIR) of 2nd stage (_2) NeutralCurrent (NC)to system not transformeritself in LV side

82 LV IDMTL NC ON 1/0 0 IDMTL Neutral Current (NC) in LV side on

83LV IDMTL NC DIR

ON1/0 0

Direction(DIR) detection of IDMTL NeutralCurrent (NC) in high voltage (LV)side on

84LV IDMTL NC DIR

TO SYS1/0 0

Direction (DIR) of IDMTL Neutral Current(NC)to system not transformer itself in LVside

85 LV 3U0> ALARMON

1/0 0Neutral displacement (3U0) alarm in LVside on

86 LV 3U0> TRIP ON 1/0 0Neutral displacement (3U0) trip in LV sideon

87 LV OLD ON 1/0 0 Overload (LOAD)in LV side on

88 LWIND OLD ON 1/0 0Winding(WIND) Overload(LOAD) in LV sideon

89 HV CB PD ON 1/0 0Circuit break(CB) pole discordance (PD) inHV side on

90 HV CB PD CUR ELEON

1/0 0Circuit break(CB) pole discordance(PD)with Current (CUR)element(ELE) in HVside on

91 HV CB2 PD ON 1/0 0Circuit break(CB) pole discordance (PD) inHV side 2 on

92HV CB2 PD CUR

ELE ON1/0 0

Circuit break(CB) pole discordance(PD)with Current (CUR)element(ELE) in HVside 2 on

93 MV CB PD ON 1/0 0Circuit break(CB) pole discordance (PD) inMV side on

94MV CB PD CUR ELE

ON1/0 0

Circuit break(CB) pole discordance(PD)with Current (CUR)element(ELE) in MVside on

CB PDSet

95 HV1 I2 DET ON 1/0 0CB1 negative imbalance detection in HVside on

96 HV2 I2 DET ON 1/0 0CB2 negative imbalance detection in HVside on

97 MV I2 DET ON 1/0 0CB negative imbalance detection in MVside on

98 LV I2 DET ON 1/0 0CB negative imbalance detection in LV sideon

99HV CB1 STATUS

ON1/0 0 CB1 Status supervision in HV side on

100 HV CB2 STATUSON

1/0 0 CB2 Status supervision in HV side on

101 MV CB STATUS ON 1/0 0 CB Status supervision in MV side on

OtherSet


-67-

102 LV CB STATUS ON 1/0 0 CB Status supervision in LV side on

103REF OPTD Record

ON1/0 0 REF operated trigger Record on

104TRAFO Trip Record

ON1/0 0 TRAFO BUCH Trip disturbance Record on

105 BUCH AlarmRecord ON

1/0 0 BUCH Alarm disturbance Record on

106WTI High Trip

Record ON1/0 0 WTI High Trip disturbance Record on

107 WTI High AlarmRecord ON

1/0 0 WTI High Alarm disturbance Record on

108OTI High TripRecord ON

1/0 0 OTI High Trip disturbance Record on

109OTI High Alarm

Record ON1/0 0 OTI High Alarm disturbance Record on

110 LowOilLevelAlarmRecord ON

1/0 0 Low Oil Level Alarm disturbance Record on

111OLTC Trip Record

ON1/0 0 OLTC Trip disturbance Record on

112 PRD Trip RecordON

1/0 0 PRD Trip disturbance Record on


-68-

7 Installation and commissioning

7.1 Unpacking & Repacking

• When dispatched from the factory, the equipment is packed in accordance with the

guidelines laid down in IEC 60255-21, which specifies the impact resistance of

packaging .This packing shall be removed with care, without force to the equipment

and without the use of inappropriate tools.

• The equipment should be visually checked to ensure that there are no external

traces of damage. Verify that the conformity certificates, matched documents,

accessories are consistent with the order requirements, and ensure that the type,

nameplate, numbers of the equipments are perfect and consistent with packing list.

• The transport packing can be re-used for further transport when applied in the same

way. The storage packing of the individual equipments is not suited to transport. If

alternative packing is used, this must also provide the same degree of protection

against mechanical shock, as laid down in IEC 60255-21-1 class 2 and IEC 60255-21-

2 class 1.

• Before initial energizing with supply voltage, the equipment shall be situated in the

operating area for at least two hours in order to ensure temperature equalization and

to avoid humidity influences and condensation.

7.2 Mounting

• The equipment ought to be fixed on panel or cabinet, and every connection bolt of

the equipment must be firmed.

• Using earthing coppery wires connect the equipment ground and panel (cabinet)

ground with bus line and verify the earthing is reliably.

• Checking the connection

• The equipment wiring must meet the requirements of wiring scheme.

7.3 Check before power on

• Pull out all the modules, check-up whether the mechanical structures accessory on

the board becomes flexible or there are mechanical damages and whether the wiring

is fastness.

• Check the man-machine interface is connected with faceplate reliable.

• Check the type tag of the equipment on faceplate, the lighting tag, backboard

terminal figure, terminal number tag and nameplate label of the equipment are intact

and right.

• Each module withdrawal and insertion is flexible, space between module and plug

slot are suitable right, and the insertion depth is satisfied. Verify the lock-up is

reliable. The slice of current connector for short circuit ought to be opened reliably

when module is inserted.

• Test insulation resistance in turn between analog circuits and ground, and the

circuits to each others every resistance must not be less than 100 MΩ.


-69-

7.4 Check with power on

• Power supply check

Testing of voltage output value and its stability every class output voltage must be

maintained stable as shown in Table 44 when the input voltage of DC power supply is UN.

Table 44: Permissive range for dc supplied by the power

Rated voltage Permissive range

+5 4.8 to 5.2+12 11 to 13−12 −11 to −13+24 22 to 26

• Give alarm after power off

Energized DC power supply, the equipment for loss of power alarm ought to be excited

reliably, and its contacts as X12-c16 and X12-a16 must be opened reliably. Cut off rating

DC power supply, the relay for loss of power alarm ought to be lost magnetism reliably,

and its contacts as X12-c16 and X12-a16 must be closed reliably.


-70-

8 Maintenance

8.1 Routine checks

• Measure resistance in turn between analog circuits and ground.

• Measure output voltage in every class.

• Check printer.

• Revise zero draft and scale.

• Verify alarm circuit.

• Verify binary input.

• Actual live tripping including circuit breaker.

• Check setting.

8.2 Relacing the back-up battery

• Battery is used to store data, record fault and inner clock in case the power is off.

• Battery is checked up timing, it will send out alarm after it is invalid or decline.

• The back-up battery should be replaced at the latest after 10 years of operation or

after alarm signal was sent out.

• Recommended battery: Lithium battery CR1/2AA, 3V/1Ah.

8.3 Fault tracing

The equipment may test all hardware components itself, including loop out of the

relay coil, Watch can find whether or not the equipment is in fault through warning lights

and warning characters which shows in liquid crystal display and print reports to tell fault

location and kind.

The method of eliminate fault is replacing fault board or eliminate external fault.

8.4 Repairs

• Users should not change modules circuit or backboard circuit in repair.

• It’s appropriate to change power board when power supply is fault.

• It’s suggested that power board should purchased per 4 or 6 years because it can’t

storage for a long time.


-71-

9 Storage

• Although protection equipments are generally of robust construction, they require a

careful treatment prior to installation on site, since they must be carefully packed and

unpacked, without applying any force to the equipment and using suitable tools. Once

supplied, the equipment must be thoroughly inspected to ensure that they have not

undergone shipping damages. If the equipment is not immediately installed upon

reception, they must be stored in places free from dust and moisture, causticity in their

original packing.

• Storage temperature: -10°C + 40°C.

• The equipment must only be stored and carried in the special antistatic bag.


-72-

10 Ordering

10.1 Ordering data

10.2 Ordering data sample

For example, CSC-326M2_1552WA1, it shows that,

1. Three-winding transformer or auto-transformer,

2. In HV side, rated current of CT is 1A;

3. In MV side, rated current of CT is 5A;

4. In LV side, rated current of CT is 5A;

5. Power is 220V DC;

6. Master Module type, different hardware is 125;

7. Electric Ethernet interface or Fiber Ethernet interface on Master module (2 ports) is A;

8. RS485 interface on Master module is 1.


-73-

11 Appendix

This appendix is primarily a reference for the experienced user. General diagrams

indicating the terminal connections of the CSC326 models are included. Connection

examples show the proper connections of the device to primary equipment in typical

power system configurations. Tables with all information available in a CSC-326

equipped with all options are provided.

The main contents are as follows:

11.1 Terminal diagrams.

11.2 Connection examples.

11.3 Digital input module.

11.4 Digital output module.

11.5 Communication Protocol.

11.1 Terminal diagrams:

5

1

2

3

4

10

7

6

8

9

12

11

55 I HV2B' I HV2B

3

4

2

1

b a

X3( AI MODULE)

I LVC

I LVA

I LVB

I LVA'

I LVB'

I LVC'

1

2

3

4

b a

X2( AI MODULE)

I MVB'

I MVA'

I MVC'

I MVA

I MVB

I MVC

b a

X1( AI MODULE)

I HV1B'

I HV1A'

I HV1C'

I HV2A'

I HV1B

I HV1A

I HV1C

I HV2A

8

9

7

6

10

11

12

10

7

6

8

9

ULVB

ULVAULVN

ULVC

12

11

UMVC

UMVN UMVA

UMVB

I HV2C' I HV2C

UHVC

UHVN UHVA

UHVB

I LVWC

I LVWA

I LVWB

I LVWA'

I LVWB'

I LVWC'

I REFHVI REFHV'

I REFMVI REFMV'

X4( MASTER MODULE)

232- TRAN

232- RECV

232-GND

485- 1A

485- 1B

485- 2A

GPSGND

LONGND

LON- 1B

LON- 1A

LON- 2B

485- 2B

NOT USED

GPS

NOT USED

12

6

3

12

45

9

78

1011

1314

1615

DC+ I NPUT

X12( POWER)

2

6

4

8

12

10

14

18

16

20

R24V+ OUT

c a

R24V- OUT

DC FAI LURE

24

22

26

30

28

32

DC- I NPUT

14

DC+ I NPUT2

8

4

6

10

12

X6( DI MODULE)

c a

ALARM I

DC- I NPUT

NOT LATCHED

LATCHED

26

20

16

18

22

24

32

28

30

c

c

a

a

OI L LEVEL ALARM

OTI HI GH ALARM

PRD TRI P

OLTC BUCH TRI P

REM ACCESS BLK

RELAY TEST

RESET

I NBKMV' I NBKMV

I NBKHVI NBKHV'

UMV0N UMV0 UHV0N UHV0

DO 1

DO 2

DO 1

DO 2

DO 2

DO 1

DO 2

DO 1

DO 1

DO 2

4

2

8

6

10

14

12

20

18

16

X10( DO MODULE)

c a

26

24

22

28

32

30

DO 2( NOT LATCHED)

DO 1( LATCHED)

DO 2( NOT LATCHED)

DO 1( LATCHED)

DO 2£ NC£ ©

DO 1£ NO£ ©BLK VOL REGU

X8( DO MODULE)

a

DO 1

DO 2

DO 1

DO 2

4

2

6

8

c

DO 2

DO 1

DO 1

DO 2

DO 1

DO 2

12

10

14

16

18

20

DO 322

24

26

28

30

32 FUTURE USE 2 (NC)

HV CB1 ON

HV CB2 ON

MV CB ON

LV BU

MV BU

HV REF ACT

MV REF ACT

DO 1

DO 2

DO 3

DO 1

DI FF

REF

OVERFLUX

HV BU

CBF-1

CBF- 2

CBF- 3

PD-1

PD- 2

PD- 3

FUTURE USE 1

X11( DO MODULE)

2

c

6

4

8

12

10

20

16

18

14

a

22

24

28

30

26

32 LV CB ON

ALARM I I

CT FAI L

DI FF ACT

SI G1 COM1(LATCHED)

SI G1 COM2(LATCHED)

SI G2 COM1( NOT LATCHED)

SI G2 COM2(NOT LATCHED)



LON- 2A

NEU DI SP ALARMOVERLOAD

ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT

OVERLOAD

ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT


OVERFLUX ACT

OVERFLUX ACT

OVERFLUX ACTVT FAI L

BACK ACT

NEU DI SP ALARM

MV CB STATUS

MV CB PD

HV CB1 PD

HV CB2 PD

HV CB2 STATUS

HV CB1 STATUS

LV CB STATUS

R24V+ I NPUT

R24V- I NPUT

REF OPTD

NOT USED

NOT USED

NOT USED

NOT USED

OTI HI GH TRI P

WTI HI GH ALARM

WTI HI GH TRI P

BUCH ALARM

TRAFO/ BUCH TRI P

Fig. 28: CSC-326 Terminal diagram on the rear board (Model 2)

74

5

1

2

3

4

10

7

6

8

9

12

11

5 I HV2B' I HV2B

3

4

2

1

b a

X3( AI MODULE)

I LVC

I LVA

I LVB

I LVA'

I LVB'

I LVC'

b a

X1( AI MODULE)

I HV1B'

I HV1A'

I HV1C'

I HV2A'

I HV1B

I HV1A

I HV1C

I HV2A

8

9

7

6

10

11

12

ULVB

ULVAULVN

ULVC

I HV2C' I HV2C

UHVC

UHVN UHVA

UHVB

I REFHVI REFHV'

X4(MASTER MODULE)

232-TRAN

232-RECV

232-GND

485- 1A

485- 1B

485- 2A

GPSGND

LONGND

LON-1B

LON-1A

LON-2B

485- 2B

NOT USED

GPS

NOT USED

12

6

3

12

45

9

78

1011

1314

1615

DC+ I NPUT

X12(POWER)

2

6

4

8

12

10

14

18

16

20

R24V+ OUT

c a

R24V- OUT

DC FAI LURE

24

22

26

30

28

32

DC- I NPUT

14

DC+ I NPUT2

8

4

6

10

12

X6( DI MODULE)

c a

ALARM I

DC- I NPUT

NOT LATCHED

LATCHED

26

20

16

18

22

24

32

28

30

c

c

a

a

REM ACCESS BLK

RELAY TEST

RESET

I NBKHVI NBKHV'

UHV0N UHV0

DO 1

DO 2

DO 1

DO 2

DO 2

DO 1

DO 2

DO 1

DO 1

DO 2

4

2

8

6

10

14

12

20

18

16

X10(DO MODULE)

c a

26

24

22

28

32

30

DO 2(NOT LATCHED)

DO 1(LATCHED)

DO 2(NOT LATCHED)

DO 1(LATCHED)

DO 2£ NC£ ©


X8(DO MODULE)

a

DO 1

DO 2

DO 1

DO 2

4

2

6

8

c

DO 2

DO 1

DO 1

DO 2

DO 1

DO 2

12

10

14

16

18

20

DO 322

24

26

28

30


HV CB1 ON

HV CB2 ON

LV CB ON

LV BU

NOT USED

HV REF ACT

LV REF ACT

DO 1

DO 2

DO 3

DO 1

DI FF

REF

OVERFLUX

HV BU

CBF- 1

CBF-2

CBF-3

PD-1

PD-2

PD-3

FUTURE USE 1

X11(DO MODULE)

2

c

6

4

8

12

10

20

16

18

14

a

22

24

28

30

26

32 NOT USED

ALARM I I

CT FAI L

DI FF ACT

SI G1 COM1( LATCHED)






LON- 2A


ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT

OVERLOAD

ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT


OVERFLUX ACT

OVERFLUX ACT


BACK ACT

NEU DI SP ALARM

NOT USED

NOT USED

HV CB1 PD

HV CB2 PD

HV CB2 STATUS

HV CB1 STATUS

LV CB STATUS

R24V+ I NPUT

R24V- I NPUT

NOT USED

NOT USED

NOT USED

REF OPTD

NOT USED

I REFLVI REFLV'

I NBKLVI NBKLV'OI L LEVEL ALARM

OTI HI GH ALARM

PRD TRI P

OLTC BUCH TRI P

OTI HI GH TRI P

WTI HI GH ALARM

WTI HI GH TRI P

BUCH ALARM

TRAFO/ BUCH TRI P

Fig. 29: CSC-326 Terminal diagram on the rear board (Model 1)

11.2 Connection Examples

Figure 30 illustrates the recommended standard connection for two-winding

transformers. Figure 31 illustrates the recommended standard connection for three-

winding transformers.

Differential protection embraces protection of the high voltage side and low

voltage side of the transformer cable. The permissible cable length and the CT design

(permissible load) are mutually dependent. Recalculation is advisable as for lengths of

more than 100m.

75

Typical connection 1:

2a

3a

2b

3b

IHVA1a 1b

7a 7b

8a 8bINBKHV

IHVB

IHVC

2a

3a

2b

3b

ILVA1a 1b

ILVB

ILVC

A B C

A B C

UHVA 11a

10a

10b

11b

9a

9b

UHVB

UHVC

UHVN

UHV0

UHV0N

ULVA11a

10a

10b

11b

ULVB

ULVC

ULVN

AI1

AI3

IREFHV

Transformermodule

Transformermodule

Fig. 30: Typical connection example for two-winding transformer.

76

Typical connection 2:

2a

3a

2b

3b

IHA 1a 1b

IHB

IHC

A B C

A B C

UHA 11a

10a

10b

11b

9a

9b

UHB

UHC

UHN

UH0

UH0N

UL1A11a

10a

10b

11b

UL1B

UL1C

UL1N

AI1

AI3Transformermodule

Transformermodule


2a

3a

2b

3b

1a 1bIMA

IMB

A B C

IMC

UMA

11a

10a

10b

11b

9a

9b

UMB

UMC

UMN

UM0

UM0N

2a

3a

2b

3b

IL1A1a 1b

IL1B

IL1C

4a 4b

5a 5b


IH0

IHJX

IMJ

6b6aIM0

7b7a

Fig. 31: Typical connection example for three-winding transformer.

77

11.3 Digital input module

14

DC+ I NPUT2

8

4

6

10

12

X6( DI MODULE)

c a

ALARM I

DC- I NPUT

NOT LATCHED

LATCHED

26

20

16

18

22

24

32

28

30

c

c

a

a

OI L LEVEL ALARM

OTI HI GH ALARM

PRD TRI P

OLTC BUCH TRI P

REM ACCESS BLK

RELAY TEST

RESET

MV CN STATUS

MV CB PD

HV CB1 PD

HV CB2 PD

HV CB2 STATUS

HV CB1 STATUS

LV CB STATUS OTI HI GH TRI P

WTI HI GH ALARM

WTI HI GH TRI P

BUCH ALARM

TRAFO BUCH TRI P

R24V+ I NPUT

R24V- I NPUT

REF OPTD

t o X12 a20/ c20/ a22/ c22

t o X12 a26/ c26/ a28/ c28

t o X12 a2/ c2/ a4/ c4

t o X12 a8/ c8/ a10/ c10/ a12/ c12

Di gi t al i nput - gr oup 0, No 0























Di gi t al i nput - gr oup 2, No 7 NOT USED

NOT USED

NOT USED

NOT USED

Fig. 32: Connection for digital input module.

11.4 Digital output module

X8( DO MODULE)

a

DO 1

DO 2

DO 1

DO 2

4

2

6

8

c

DO 2

DO 1

DO 1

DO 2

DO 1

DO 2

12

10

14

16

18

20

DO 322

24

26

28

30


DO 1

DO 2

DO 3

DO 1

DI FF

REF

OVERFLUX

HV BU

CBF- 1

CBF- 2

CBF- 3

PD-1

PD- 2

PD- 3

FUTURE USE 1

2c 2a

4c 4a

6c 6a

8c 8a

10c 10a

12c 12a

14c 14a

16c 16a

18c 18a

20c 20a

22c 22a

24c 24a

26c 26a

28c 28a

30c 30a

32c 32a

ever y cont act i s separ at e.

Fig. 33: Connection for digital output module (X8 module)

78

DO 1

DO 2

DO 1

DO 2

DO 2

DO 1

DO 2

DO 1

DO 1

DO 2

4

2

8

6

10

14

12

20

18

16

X10( DO MODULE)

c a

26

24

22

28

32

30

DO 2( NOT LATCHED)

DO 1( LATCHED)

DO 2( NOT LATCHED)

DO 1( LATCHED)

DO 2£ NC£ ©


HV CB1 ON

HV CB2 ON

MV CB ON

LV BU

MV BU

HV REF ACT

MV REF ACT

6c 6a

8c 8a

10c 10a

12c 12a

14c 14a

16c 16a

18c 18a

20c 20a

22c 22a

24c 24a

26c 26a

28c 28a

30c 30a

32c 32a

2c 2a

4c 4aa r el ay, t wo cont act s

a r el ay, t wo cont act s







Fig. 34: Connection for digital output module(X10 module).

X11(DO MODULE)

2

c

6

4

8

12

10

20

16

18

14

a

22

24

28

30

26

32 LV CB ON

ALARM I I

CT FAI L

DI FF ACT








ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT

OVERLOAD

ALARM I I

CT FAI L

VT FAI L

DI FF ACT

BACK ACT


OVERFLUX ACT

OVERFLUX ACT


BACK ACT

NEU DI SP ALARM

8a

10a

4a

6a

2a

18a

20a

14a

16a

28a

30a

24a

26a

12a

22a

8c

10c

4c

6c

2c

18c

20c

14c

16c

28c

30c

24c

26c

12c

22c

32c 32a

2a/ 12a/ 22a, onl y a r el ay, t hr ee cont act s2c/ 12c/ 22c, onl y a r el ay, t hr ee cont act s

Fig. 35: Connection for digital output module(X11 module).

79

11.5 Communication Protocol

Table 45: Communication protocol

Front port for communication

Connection type electric COM port

Communication protocol Interior communication protocol

Type of connector DB9 pin connector

Speed of communication 9600 bps

Rear port for local /

remote communication

only local communication

Connection type RS-232;Ethernet;RS-485

Communication protocol CSC2000

Medium of connection electric

Type of connectorRS-232:DB25 connector;Ethernet:RJ45;RS-485:twisted-pair

Speed of communicationRS-232:9600bps; Ethernet:10/100Mbps adaptable; RS-485:9600bps~38400bps

Isolation Yes

Dielectric level III

Maximum cable length RS-232:10m;Ethernet:110m ;RS-485:1.2km

Type of port required atPC end

Ethernet:RJ45;RS-485:COM port

Functions supported bythis port

RS-232:Print setting, fault report, waveform reportEthernet&RS-485:see above 12 m)

Rear port for substation automation

Connection type 3 Ethernet port;2 RS-485; 2 Lon works

Communication protocolCSC2000 or IEC 60870-5-103 or IEC 61850 for Ethernetport or RS-485; CSC2000 for Lon works

Medium of connectionEthernet port: optics/electric ;RS-485:electric;Lonworks:electric

Type of connectorEthernet port:(SC/ST)/RJ45 ; RS-485:twisted-pair;Lonworks: twisted-pair

Speed of communicationEthernet port:10/100Mbps adaptable ; RS-85:9600bps;Lonworks:78kbps

Maximum cable lengthEthernet port(optics/electric):110m/2km ; RS-485:1.2km; Lonworks:1.3km

Optical wavelength 850nm;1300nm

Permissible lineattenuation

15dB

Type of port required atPC end

Ethernet port; COM port

Standard IEC 60870-5-103; IEC 61850

csc 326 manual

Documents

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