spaj 131 c overcurrent relay - abb ltd · spaj 131 c overcurrent relay user´s manual and technical...

RS 421 Ser.No.

SPAJ 131 C

2

5

1028

D

fn = 50Hz

60Hz

12345

/ >tt

n/II

n )( >I

n )( >>I

>>/ tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

nI = 1A 5A

SPCJ 3C3

REGISTERS

0 0 0 0

12345678

0 1

SGR

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

SPAJ 131 COvercurrent relay

User´s manual and Technical description

2

SPAJ 131 COvercurrent relay

Contents Features .......................................................................................................................... 2Application ..................................................................................................................... 3Description of operation ................................................................................................. 3Connections ................................................................................................................... 4Configuration of output relays ....................................................................................... 6Start and operation indicators ......................................................................................... 7Combined power supply and I/O module ...................................................................... 7Technical data (modified 2002-05) ................................................................................. 8Examples of application ................................................................................................ 10Secondary injection testing ........................................................................................... 18Maintenance and repair ................................................................................................ 22Spare parts .................................................................................................................... 22Ordering numbers ........................................................................................................ 22Dimensions and instructions for mounting .................................................................. 23Order information ........................................................................................................ 23

The complete manual for the three-phase overcurrent relay SPAJ 131 C includesthe following partial manuals:

Overcurrent relay SPAJ 131 C, general description 1MRS 750660-MUM ENThree-phase overcurrent relay module SPCJ 3C3 1MRS 750602-MUM ENGeneral characteristics of C-type relay modules 1MRS 750328-MUM EN

Features Three-phase low-set phase overcurrent stagewith definite time or inverse time characteristic

High-set phase overcurrent stage with definitetime characteristic

Both overcurrent stages can be blocked by anexternal control signal

Output relay functions freely configurable fordesired operation

Flexible adaptation of relay to specific applica-tions

Local numerical display of setting values, meas-ured values and recorded fault values

Serial interface for two-way data communica-tion over fibre-optic bus between relay andsubstation and/or remote control systems

Continuous self-supervision of hardware andsoftware, including auto-diagnostics

1MRS 750660-MUM EN

Issued 1997-02-24Modified 2002-05-17Version B (replaces 34 SPAJ 20 EN1)Checked MKApproved OL

Data subject to change without notice

3

Application The overcurrent relay SPAJ 131 C is designedto be used for two-stage phase overcurrent pro-tection of distribution feeders, large low-voltagemotors, high-voltage motors, medium-sized andlarge generators and power transformers. Therelay can be used both as main protection relayand back-up protection relay.

The relay has two protection stages: a low-setovercurrent stage I> and a high-set overcurrent

stage I>>. The low-set stage operates with defi-nite-time characteristic or with inverse-timecharacteristic, while the high-set stage operateswith definite time characteristic only.

The overcurrent relay is provided with fiveoutput relays, of which four are freely configur-able for the desired function. Two of the outputrelays have heavy-duty contacts capable of di-rectly controlling a circuit breaker.

The overcurrent relay SPAJ 131 C is a secondaryrelay that is connected to the current transform-ers of the protected object. The relay can be usedfor single-phase, two-phase or three-phase over-current protection. The overcurrent relay con-tinuously measures the phase currents of theobject to be protected. On the occurrence of afault the overcurrent relay generates an alarmsignal, trips the circuit breaker or starts externalauto-reclose functions, in accordance with thecurrent application.

When the phase current exceeds the set startvalue I> of the low-set stage, the overcurrentrelay starts. When, at definite time operation,the set operate time t> or, at inverse definiteminimum time (IDMT) operation, the calcu-lated operate time t>, expires, the relay operates.In the same way the high-set stage starts once itsset start value I>> is exceeded and, when the setoperate time t>> expires, the relay operates.

The low-set stage of the overcurrent relay can begiven either definite-time or inverse-time char-acteristic. At inverse time characteristic fourinverse time curve sets with different slopes areavailable: Normal inverse, Very inverse, Ex-tremely inverse and Long-time inverse. Thesecurve sets comply with the BS 142 and IEC60255 standards.

The start signals from the overcurrent relay areobtainable as contact functions. The start signalcan be used, for instance, for blocking cooperat-ing protection relays.

The relay contains one optically isolated logicinput for incoming external control signals,generally blocking signals.

Descriptionof operation

Three-phase low-set overcurrent stage with definite time or inverse definite minimum time operation characteristic

Three-phase high-set overcurrent stage with instantaneous or definite time operation characteristic

Blocking of high-set and/or low-set overcurrent stages by external control signal

Serial communication

51

50

Tripping 1

Tripping 2

Start 1

IRF

Signal 1

Serial portBlocking

IL1

IL2

IL3

Fig. 1. Protection functions of the overcurrent relay SPAJ 131 C. The encircled numbers refer tothe ANSI (=American National Standards Institute) number of the concerned protection function.

4

Connections

Fig. 2. Connection diagram for the three-phase overcurrent relay SPAJ 131 C.

Uaux Auxiliary voltageA,B,C,D,E Output relaysIRF Self-supervision functionBS Blocking signalSS Start signalTS Trip signalSGR Switchgroup for configuring trip and alarm signalsSGB Switchgroup for configuring blocking signalsTRIP_ Trip outputSIGNAL1 Signal on relay operationSTART1 Start signal or signal on relay operationU1 Three-phase overcurrent relay module SPCJ 3C3U2 Power supply and I/O module SPTU 240S1 or SPTU 48S1U3 I/O module SPTE 3E4SERIAL PORT Serial communication portSPA-ZC_ Bus connection moduleRx/Tx Optical-fibre receiver terminal (Rx) and transmitter terminal (Tx) of the bus

connection module

L1

L2

L3

0

Ι

0

Ι

-

-

+

+

6873 2 4

5A 1A

5SGR/1

SPAJ 131 C U2

U3

U31 1 1 1

D C B A

+ -

Uaux

E

+-

(~)

(~)

≅ _

5A1A5A 1A

5 81 68 661 2 3 4 6 7 8 9 10 11 61 62 70 71 72 77 78 80 69 65

SGR

IRF

START1 SIGNAL1 TRIP2 TRIP1IRFBS+

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

3I>

t >>

t >,k

3I>>

SP

A-Z

C_

Rx Tx

SERIALPORT

5

Fig.3. Rear view of the overcurrent relay SPAJ 131 C

Specification of input and output terminals

Contacts Function

1-2 Phase current IL1 (In = 5 A)1-3 Phase current IL1 (In = 1 A)4-5 Phase current IL2 (In = 5 A)4-6 Phase current IL2 (In = 1 A)7-8 Phase current IL3 (In = 5 A)7-9 Phase current IL3 (In = 1 A)10-11 External blocking signal (BS)61-62 Auxiliary power supply.

When DC voltage is used the positive pole is connected to terminal 61.65-66 Trip output 1 for the I> and I>> stages (TRIP 1)68-69 Trip output 2 for the I> and I>> stages (TRIP 2)80-81 Signal on tripping of the I> and I>> stages (SIGNAL 1)77-78 Signal on tripping of stage I>>, starting of the I> and I>> stages (START1)70-71-72 Self-supervision (IRF) alarm output. Under normal conditions the contact interval

70-72 is closed. When the auxiliary voltage disappears or an internal fault is detected,the contact interval 71-72 closes.Protective earth terminal

Mad

e in

Fin

land

1

2

3

4

5

6

7

8

9

70

71

72

61

62

65

66

68

69

80

81

77

78

10

11

TTL

B47

0372

Rx

Tx

In single-phase applications it is recommendedthat the energizing current is routed throughtwo energizing inputs of the relay connected inseries. This arrangement secures a faster opera-tion time of the relay, in particular, at instanta-neous operation.

The overcurrent relay SPAJ 131 C connects tothe fibre optic data communication bus bymeans of the bus connection module SPA-ZC17 or SPA-ZC 21. The bus connection moduleis fitted to the D-type connector (SERIALPORT) on the rear panel of the relay. The opto-connectors of the optical fibres are plugged intothe counter connectors Rx and Tx on the busconnection module.

6

In addition, the following functions can beselected with the switches of the SGR switch-group on the front panel:

Configuration ofoutput relays

The trip signal of the I> stage is firmly wired tooutput relay A and the trip signal of the I>> stageis firmly wired to output relay B.

Switch Function Factory User'ssettings settings

SGR/1 Routes the ext. blocking signal to the overcurrent module 1

SGR/2 Routes the start signal of the I>> stage to output relay D 1

SGR/3 Routes the start signal of the I> stage to output relay D 1

SGR/4 Routes the trip signal of the I>> stage to output relay D 1

SGR/5 Routes the trip signal of the I>> stage to output relay C 1

SGR/6 Routes the trip signal of the I>> stage to output relay A 1

SGR/7 Routes the trip signal of the I> stage to output relay C 1

SGR/8 Routes the trip signal of the I> stage to output relay B 1

The circuit breakers can be directly controlledwith output relay A or output relay B. Thuseither operation stage may have its own trip

output relay and two separate circuit breakerscan be controlled with the same overcurrentrelay.

7

Start andoperationindicators

RS 421 Ser.No.

SPAJ 131 C

2

5

1028

D

fn = 50Hz

60Hz

12345

/ >tt

n/II

n )( >I

n )( >>I

>>/ tt%[ ]%[ ]

Uaux

80...265V ~–

18...80V –

nI = 1A 5A

SPCJ 3C3

REGISTERS

0 0 0 0

12345678

0 1

SGR

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B2. The yellow LEDs (IL1, IL2, IL3) on the upper

black part of the front plate indicate, when lit,that the value of the concerned phase currentis being displayed.

3. The red IRF indicator of the self-supervisionsystem indicates, when lit, that a permanentinternal relay fault has been detected. Thefault code appearing on the display once afault has been detected should be recordedand notified when service is ordered.

4. The green Uaux LED on the front panel is litwhen the power supply module operates prop-erly.

5. The LED indicator below a setting knobindicates, when lit, that the setting value isbeing displayed.

6. The LED of the SG1 switchgroup indicates,when lit, that the checksum of the switch-group is being displayed.

The start and operation indicators, the functionof the SG2 software switchgroup and the func-tions of the LED indicators during setting aredescribed more detailed in the relay modulemanual for the three-phase overcurrent relaymodule SPCJ 3C3.

1. Either overcurrent stage has its own opera-tion indicator (I> and I>>), located in theright bottom corner of the front plate of therelay module. Yellow light indicates that theconcerned stage has started and red light thatthe stage has operated (tripped).

With the SG2 software switchgroup the startand trip indicators can be given a latchingfunction, which means that the LEDs and theoutput relay remain lit, although the signalthat caused operation returns to normal. Theindicators are reset with the RESET push-button. An unreset indicator does not affectthe operation of the relay.

Combined powersupply and I/Omodule

The combined power supply and I/O module(U2) is located behind the system front panel ofthe protection relay and can be withdrawn fromthe relay case after removal of the system frontpanel. The power supply and I/O module incor-porates a power unit, four output relays, thecontrol circuits of the output relays and theelectronic circuitry of the external control in-put.

The power unit is transformer connected, thatis, the primary circuit and the secondary circuitsare galvanically isolated. The primary circuit isprotected by a slow 1 A fuse F1, placed on thePC board of the module. When the powersource operates properly, the green Uaux LEDon the front panel is lit.

The power supply and I/O module is availablein two versions which have different input volt-age ranges:

- type SPTU 240S1 Uaux = 80...265 V ac/dc- type SPTU 48S1 Uaux = 18...80 V dc

The input voltage range of the power supply andI/O module incorporated in the relay on deliv-ery is marked on the system front panel of therelay.

8

Technical data(modified 2002-05)

Energizing inputs 1 A 5 ATerminals 1-3, 4-6, 7-9 1-2, 4-5, 7-8Rated current In 1 A 5 AThermal withstand capabilityCarry continuously 4 A 20 AMake and carry for 10 s 25 A 100 AMake and carry for 1 s 100 A 500 ADynamic current withstand capability,half-wave value 250 A 1250 AInput impedance <100 mΩ <20 mΩRated frequency fn acc. to order 50 Hz or 60 Hz

Output contact ratingsTerminals 65-66, 68-69Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 30 AMake and carry for 3 s 15 ABreaking capacity for dc, when the manoeuvrecircuit time constant L/R ≤ 40 ms,at the control voltages- 220 V dc 1 A- 110 V dc 3 A- 48 V dc 5 A

Signalling contactsTerminals 70-71-72, 77-78, 80-81Rated voltage 250 V ac/dcCarry continuously 5 AMake and carry for 0.5 s 10 AMake and carry for 3 s 8 ABreaking capacity for dc, when the signallingcircuit time constant L/R ≤ 40 ms,at the control voltages- 220 V dc 0.15 A- 110 V dc 0.25 A- 48 V dc 1 A

External control inputTerminals 10-11Control voltage level 18...265 V dc or

80...265 V acCurrent consumption when input activated 2...20 mA

Auxiliary supply voltagePower supply and I/O modules and voltage ranges:- type SPTU 240S1 80...265 V ac/dc- type SPTU 48S1 18...80 V dcPower consumption under quiescent/operatingconditions ~4 W/~6 W

9

Three-phase overcurrent relay module SPCJ 3C3Low-set stage I>Start current I>, setting range 0.5...2.5 x InSelectable modes of operation- definite time characteristic

- operate time t> 0.05...100 s- inverse definite minimum time (IDMT) characteristic

- curve sets acc. to IEC 60255-3 and BS 142 Normal inverseVery inverseExtremely inverseLong-time inverse

- time multiplier k 0.05...1.00High-set stage I>>Start current I>>, setting range 0.5...20 x In and ∞, infiniteOperate time t>> 0.04...100 s

Data communicationTransmission mode Fibre optic serial busData code ASCIISelectable data transfer rates 300, 1200, 2400, 4800 or 9600 BdFibre optic bus connection module,powered from the host relay- for plastic fibre cables SPA-ZC 21 BB- for glass fibre cables SPA-ZC 21 MMFibre optic bus connection module witha built-in power supply unit- for plastic fibre cables SPA-ZC 17 BB- for glass fibre cables SPA-ZC 17 MM

Insulation Tests *)Dielectric test IEC 60255-5 2 kV, 50 Hz, 1 minImpulse voltage test IEC 60255-5 5 kV, 1.2/50 µs, 0.5 JInsulation resistance measurement IEC 60255-5 >100 MΩ, 500 Vdc

Electromagnetic Compatibility Tests *)High-frequency (1 MHz) burst disturbance testIEC 60255-22-1- common mode 2.5 kV- differential mode 1.0 kVElectrostatic discharge test IEC 60255-22-2 andIEC 61000-4-2- contact discharge 6 kV- air discharge 8 kVFast transient disturbance test IEC 60255-22-4and IEC 61000-4-4- power supply 4 kV- I/O ports 2 kV

Environmental conditionsSpecified ambient service temperature range -10...+55°CLong term damp heat withstand acc. to IEC 60068-2-3 <95%, +40°C, 56 d/aRelative humidity acc. to IEC 60068-2-30 93...95%, +55°C, 6 cyclesTransport and storage temperature range -40...+70°CDegree of protection by enclosurefor panel mounted relay IP 54Weight of relay including flush mounting case 3.0 kg

*) The tests do not apply to the serial port, which is used exclusively for the bus connection module.

10

equipment and possible other protection relayshave been omitted.

Examples ofapplication

Fig. 4 shows how the phase overcurrent relaySPAJ 131 C can be applied for substation pro-tection. For reasons of clarity the remote control

Fig. 4. Overcurrent relay SPAJ 131 C applied for the protection of a distribution substation.

In example 1 the low-voltage switchgear is pro-tected by an overcurrent relay SPAJ 131 C. Thetrip signal is linked to the HV side circuitbreaker of the distribution transformer.

In example 2 the overcurrent relay SPAJ 131 Cis used for protecting the outgoing feeder ofmedium voltage distribution switchgear and inexample 3 it is used for the busbar short circuitprotection.

The short circuit protection is based on blockingsbetween successive protection stages. In such anarrangement the relay located closer to the faultgives, when starting, a blocking signal back-wards to the relay that is closer to the objectsupplying the short circuit current. If there is noblocking, the relay perceives the fault as being inits own protection area and trips the circuitbreaker. As shown in Fig. 4 the busbar protec-tion can be extended beyond the power trans-former feeding the busbar system.

3I>

3I>>

3I>

3I>>

3I>

3I>>

3I>

3I>>

Exemple 1

Exemple 2

Exemple 3

110/20 kV

20 kV/380 V

Blocking signal

Tripping signal

11

Example 1.Protection ofindustrial low-voltage switchgear

6873 2 45A 1A

5SGR/1

SPAJ 131 C U2

U3

U31 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

5A 1A5A1A

5 81 68 661 2 3 4 6 7 8 9 10 11 61 62 70 71 72 77 78 80 69 65

SGR

IRF


SP

A-Z

C_

Rx Tx

0

Ι

0

Ι

-

-

+

+

L1 L3L2

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

3I>

t >>

t >,k

3I>>

~

SERIALPORT

Fig. 5. Overcurrent relay SPAJ 131 C used to protect an outgoing feeder in industrial switchgear.The switch settings are shown in the table on the next page.

The low-set stage of the overcurrent moduleSPCJ 3C3 operates as overcurrent and shortcircuit protection for the low-voltage switchgearand as back-up protection for the outgoingfeeder of the distribution switchgear. The low-set stage is set to extends to the next protectionstage. The setting of the low-set stage should beselected so as to ensure that the protectionoperates selectively together with the fuses onthe outgoing feeders. The high-set stage is set tooperate at close-by short circuits.

Separate protection for the low-voltage switch-gear is important if there are several distributiontransformer along the same feeder. In particularfaults in low-voltage switchgear fed by the smallertransformers of a system are not always capableof starting the overcurrent relay of the distribu-tion switchgear feeder.

Current asymmetry, if it appears, does not haveto be allowed for in the current settings, becausedue to the peak-to-peak measurement methodemployed by the overcurrent relay such asym-metry does not affect the operation of the relay.

12

The operation of the low-set stage of the over-current relay can be based on definite timecharacteristic or inverse time characteristic.When the definite time characteristic has beenselected the operate time of the relay is inde-pendent of the magnitude of the fault current.At inverse time characteristic, on the contrary,the operate time is a function of the fault currentlevel: the greater the fault current, the shorterthe operate time. Therefore, the relay operatetime is short at close-by faults.

Due to the inverse time characteristic shortoverloads, e.g. inrush currents, do not causespurious operations. If fuses with a high ratedcurrent are used in the network, inverse timecharacteristic has advantages over definite timecharacteristic, when time selectivity is concerned.

The low-set stage of the overcurrent relay hasfour available inverse time characteristics. Thedesired characteristic is selected with the SG1switches.

In order to obtain selectivity in a network pro-tected by fuses the characteristic "Extremelyinverse" is recommended. This characteristic isalso recommended to be used when, in everyswitching configuration, the short circuit cur-rent is several times greater than the rated cur-rent of the feeder. When employing an extreme

inverse characteristic, the relay allows a tempo-rary overload in the feeder, for instance, duringthe run-up of a large motor.

In networks with large fault current variations anormal inverse characteristic is recommended.In such a case the protection relay trips thecircuit breaker relatively quickly, even thoughthe short circuit current exceeds the rated cur-rent of the feeder only slightly. A normal inversecharacteristic does not permit very heavy over-loads.

The very inverse characteristic is an intermedi-ate form between normal inverse and extremelyinverse. In a short circuit situation the operatetime is rather short, even though the shortcircuit current varies according to the switchingconfiguration. On the other hand, the "veryinverse" characteristic, too, allows temporaryoverloading of the feeder.

The accuracy limit factor should be consideredwhen current transformers are selected, becausethe use of instantaneous tripping, in particular,requires current transformers with good capa-bilities of reproducing high fault currents.

The selector switches of the phase overcurrentrelay SPAJ 131 C can be set as follows:

Switch SG1/SPCJ 3C3 SGB/SPCJ 3C3 SGR

1 0 0 not in use 0 no blocking signal2 0 0 not in use 0 no I>> start to output relay D3 1 IDMT characteristic 0 not in use 1 I> start to output relay D4 0 no self-holding 0 no blocking to t> 0 no I> start to output relay D5 0 no I>> doubling 0 no blocking to t>> 0 no I>> trip to output relay D6 0 I>> = 2.5...20 x In 0 not in use 1 I>> trip to output relay A7 0 0 not in use 1 I> trip to output relay C8 0 0 not in use 0 no I> trip to output relay B

∑ 4

t>> = 0.04...1 s

extremely inverse

With above switch settings the output relays ofSPAJ 131 C have the following functions:

Output relay (contact) Function

A (65-66) CB open (I>, I>>)B (68-69) Signal on final trip (I>>)C (80-81) Signal on final trip (I>)D (77-78) Start of I> stageE (70-71-72) Self-supervision alarm

13

Example 2.Overvoltageprotection ofan outgoing feederin a distributionsubstation.

III

0

Ι

0

Ι

-

-

+

+

6873 2 4

5A 1A

5SGR/1

SPAJ 131 C U2

U3

U31 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

5A1A5A 1A

5 81 68 661 2 3 4 6 7 8 9 10 11 61 62 70 71 72 77 78 80 69 65

SGR

IRF


SP

A-Z

C_

Rx Tx

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

3I>

t >>

t >,k

3I>>

1)

~

SERIALPORT

1) Blocking signal to the overcurrent module of the busbar system

Fig. 6. Overcurrent relay SPAJ 131 C protecting an outgoing feeder in a distribution substation.The selector switch settings are shown in the table on the next page.

14

The high-set stage operates rapidly on shortcircuits on the feeder and the low-set stageoperates as back-up protection for faults occur-ring behind the distribution transformer.

Definite time characteristic has been employed,but it is also possible to use inverse time opera-tion characteristic of operation. The difference

between the inverse time characteristics hasbeen explained in example 1.

On starting the I>> stage blocks the high-setstage of the overcurrent relay.

The selector switches of the overcurrent relaySPAJ 131 C can be set as follows:


1 0 0 not in use 0 no blocking from feeders2 0 0 not in use 1 I>> start to output relay D3 0 Def. time charact. 0 not in use 0 no I> start to output relay D4 0 no self-holding 0 no blocking to t> 0 no I>> trip to output relay D5 0 no I>> doubling 0 no blocking to t>> 0 no I>> trip to output relay C6 0 I>> = 2.5...20 x In 0 not in use 1 I>> trip to output relay A7 0 0 not in use 1 I> trip to output relay C8 0 0 not in use 0 no I> trip to output relay B

∑ 0

t>> = 0.04...1 s

t> = 0.05...1.00 s



A (65-66) CB open (I>, I>>)B (68-69) Signal on final trip (I>>)C (80-81) Signal on final trip (I>)D (77-78) Start of I>> stage, blocking signal to the overcurrent relay

module of the busbar systemE (70-71-72) Self-supervision alarm

15

Example 3.Overcurrentprotection ofthe busbar systemin a substation

III 0

Ι

0

Ι

-

-

+

+

6873 2 4

5A 1A

5SGR/1

SPAJ 131 C U2

U3

U31 1 1 1

D C B A

+ -

Uaux

E

+-

(~)(~)

5A1A5A 1A

5 81 68 661 2 3 4 6 7 8 9 10 11 61 62 70 71 72 77 78 80 69 65

SGR

IRF


SP

A-Z

C_

Rx Tx

TS2

TS1

SGB

SS1

SS2

U1

5

4

I/O

3I>

t >>

t >,k

3I>>

1) 2)

~

SERIALPORT

1) Blocking signals from the overcurrent relays of the outgoing feeders2) Blocking signal to the high-voltage side overcurrent relay of the power transformer

Fig. 7. Overcurrent relay SPAJ 131 C used for protecting the infeeder cubicle and the busbar system.The switch settings are shown on the next page

In the example in Fig. 7 the low-set stage backsup the protection of the outgoing feeders, whereasthe high-set stage is used for protecting thebusbar system.

The operation of the busbar protection is basedon blocking signals received from the relaymodules of the outgoing feeders. If a fault occurson an outgoing feeder, the overcurrent relaymodule of the feeder sends a blocking signal tothe overcurrent module of the infeeder cubicle.Should, however, the fault be on the busbar

there will be no blocking and the overcurrentmodule of the infeeder cubicle provides a tripsignal to the infeeder circuit breaker. In this wayrelay times of about 100 ms can be obtained ata busbar short circuit. If required the blockingsuccession can be extended to the overcurrentmodule on the HV side of the power trans-former (see Fig. 4). The trip signal, too, can belinked from the busbar system to the HV sidecircuit breaker of the power transformer. Thewide setting range of the high-set stage makes itwell suited for starting the busbar protection.

16

Busbar system protection based on blockingscan also be used in the case of reverse supply onthe feeder, provided the reverse current does notexceed the setting value of the high-set stage onthe feeder. In such a case the blocking signal isgenerated by the high-set stage of the overcur-rent relay of the feeder.

The blocking signals to terminals 10-11 arelinked to the high-set stage of the overcurrentrelay by means of the SGR/1 switch on the frontpanel and the SGB/5 switch on the PC board ofthe overcurrent module. These switches have tobe in position 1.

The blocking circuit is easily tested through theTrip test function of the relay modules and thedisplay. The blocking stage of the module togenerate the blocking signal is started via the

Trip test function (see manual "General charac-teristics of C-type SPC relay modules"). Viaregister 0 of the module to receive the blockingsignal it is checked that the blocking signalarrives. For example in this application the high-set stage of the overcurrent module on theoutgoing feeder is started, signal SS2. Then theleft-most digit of register 0 of the overcurrentmodule is 2, which means that the tripping ofthe high-set stage is blocked.

In this example the operation of the low-setstage of the overcurrent relay is based on definitetime characteristic, but inverse time characteris-tic is possible as well.

The selector switches of the phase overcurrentrelay SPAJ 131 C can be set as follows:



1 0 0 not in use 1 blocking from outgoing feeders2 0 0 not in use 1 I>> start to output relay D3 0 def. time charact. 0 not in use 0 no I> start to output relay D4 1 self-holding 0 no blocking to t> 0 no I>> trip to output relay D5 0 no I>> doubling 1 blocking to t>> 0 no I>> trip to output relay C6 0 I>> = 2.5...20 x In 0 not in use 1 I>> trip to output relay A7 0 0 not in use 1 I> trip to output relay C8 0 0 not in use 0 no I> trip to output relay B

∑ 8

t>> = 0.04...1 s

t> = 0.05...1.00 s


A (65-66) CB open (I>, I>>)B (68-69) Signal for final trip (I>>)C (80-81) Signal for final trip (I>)D (77-78) Start of I>> stage, blocking signal to the HV side

overcurrent module of the power transformerE (70-71-72) Self-supervision alarm

17

Recorded dataand fault analysis

The information stored in the registers of theprotection relay can be used for analysing faultsituations and situations during normal opera-tion.

Register 1 stores the highest current value meas-ured on one of the phases L1, L2 or L3, as amultiple of the rated value of the relay. If themodule performs tripping, the current value atmoment of tripping is memorized. Any new tripresets the old recorded value and updates theregister. The same thing happens if the meas-ured current exceeds the previous recorded value.

The data stored in register 1 show the agreementbetween the setting values and, on the one hand,the actual current values that occur in a faultsituation and, on the other hand, the operationvalues in normal situations.

If a short circuit occurs on the feeder, the over-current module records the current value at themoment of tripping and stores the value inregister 1. The level of the current indicates howclose the fault location is and also whether it isa two-phase or three-phase fault. In addition,the indicators on the front plate of the overcur-rent module show in which phases the currenthas exceeded the setting value of the trippingstage.

Auxiliary submenu 1 of register 1 indicates thecurrent measured at the last tripping. A re-corded value is reset only by a new trip thatsimultaneously enters the new value into theregister.

A connection inrush current has a very shortduration, but the current level may be highenough to start the relay and the value conse-

quently stored in register 1. In this case thecurrent value recorded at the previous trippingis also stored in submenu 1 of register 1 andavailable for the analysis of the fault situation.

The level of the fault current is directly indicatedby the register values. If, for instance, the valueis 5.0 after tripping, the highest value for aseparate phase at the moment of tripping wasfive times the rated primary current of thecurrent transformers.

The number of starts of the various operationstages, registers 2 and 3, illustrates the occur-rence of the the overcurrents. Frequent starts ona feeder may, for instance, be due to too lowsetting values of the relay, connection inrushcurrents or a concealed fault, e.g. a defectiveinsulator.

Registers 4 and 5 show the duration of the lateststart situation of the operation stages, as a per-centage of the preset operate time or, wheninverse time characteristic has been selected, ofthe calculated operate time. A new start alwaysresets the counter that starts counting from zeroagain. When the stage trips, the register value is100.

Registers 4 and 5 contain information about theduration of, for instance, the connection inrushcurrent or the safety margin of the grading timesof the selective protection. If register 4 of thebusbar overcurrent relay operating as back-upprotection for an outgoing feeder has the value75 when the overcurrent module of the feederhas performed tripping, the selective protectionhas a safety margin of 25% of the operate timeof the low-set stage of the busbar overcurrentprotection.

18

Testing, both primary and secondary, shouldalways be performed in accordance with na-tional regulations and instructions.

The protection relay incorporates an IRF func-tion that continuously monitors the internalcondition of the relay and produces an alarmsignal on detection of a fault. According to themanufacturer’s recommendations the relayshould be submitted to secondary injection test-ing at five years’ intervals. These tests shouldinclude the entire protection chain from theinstrument transformers to the circuit breakers.

The secondary testing described in this manualis based on the relay’s setting values in theconcerned application. If necessary, the second-ary testing can be extended by testing the pro-tection stages throughout their setting ranges.

As switch positions and setting values may haveto be altered during the test the correct positionsof switches and the setting values of the relayduring normal operation conditions have to berecorded, for instance, on the reference cardaccompanying the relay.

To enable secondary injection testing the relayhas to be disconnected, either through dis-connectable terminal blocks or a test plug fittedon the relay.

DANGER!Do not open the secondary circuit of a cur-rent transformer during testing, if the pri-mary circuit is live. The high voltage pro-duced by an open CT secondary circuit couldbe lethal and may damage measuring instru-ments and insulation.

When the auxiliary voltage is connected to theprotection relay, the relay performs a self-testingprogram. The self-testing does not include thematching transformers and the contacts of theoutput relays. The operational condition of therelay is tested by means of ordinary relay testequipment and such a test also includes thematching transformers, the output relays andthe accuracy of the operate values.

Equipment required for testing:- adjustable voltage transformer 0...260 V, 1 A- current transformer- ammeter, accuracy ±0.5%- stop watch or counter for time measurement- dc voltage source for auxiliary supply- switches and indicator lamps- supply and pilot wires- calibrated multimeter

The secondary current of the current trans-former is to be selected on the basis of the ratedcurrent, 1 A or 5 A, of the relay energizing inputto be tested. The energizing inputs are specifiedunder the heading "Technical data, Energizinginputs".

Secondaryinjection testing

19

L1+

(~)

-(~)

TR

IP1

IRF

A

TIM

ER

ST

AR

T

S1

N

TIM

ER

S

TO

P

S2

L2L3

L1

68

73

24

5A1A

5S

GR

/1

SP

AJ

131

CU

2

U3

U3

11

11

DC

BA

+-

Uau

x

E≅

_

5A1A

5A1A5

8168

661

23

46

78

910

1161

6270

7172

7778

8069

65

SG

R

IRF

ST

AR

T1

TR

IP2

TR

IP1

IRF

BS

TS

2

TS

1

SG

B

SS

1

SS

2

U1

I/O

3I>

t >>

t >,

k

SIG

NA

L1

A

4 5

3I>>

Fig. 8. Secondary injection test connection for the overcurrent relay SPAJ 131 C.

When the test connection has been finished andthe selector switches properly set, the auxiliaryvoltage can be connected to the relay.

The correctness of the test connection can beverified by using a multimeter.

20

measurements can be made at the rated currentof the relay. It should be noticed that the relayshows the measured current as a multiple of therated current In of the energizing input occu-pied.

Checking ofmatchingtransformers

The matching transformers of the protectionrelay are tested separately for each phase. A puresinusoidal current is fed to the relay. The currentvalue indicated in the display of the relay shouldbe equal to that indicated by the ammeter. The

The switches of switchgroup SGR should be setas follows:

Switch Position

1 12 03 14 05 06 07 18 0

Then the following signals are linked to theoutput relays:

Output Function(terminals)

A (65-66) Tripping of stage I>B (68-69) (Tripping of stage I>>)C (80-81) Signal on tripping of stage I>

(LED L3)D (77-78) Start of stage I> (LED L2)E (71-72) Signal on internal relay fault

(LED L1)

Starting

The start function for one phase is tested inaccordance with Fig. 8. When required, the testcan be repeated separately for each phase. Thetest current is slowly increased until the relaystarts (LED L2 is lit) and the value of the currentat starting is read on the ammeter.

Operate time

Definite time characteristic

The operate time of the overcurrent relay ismeasured at a test current equal to 2 x the settingvalue of stage I>. The timer is started by closingswitch S1 and stopped by contact 65-66 onoperation of output relay A.

The operation of output relay C is indicated bylighting of LED L3.

When the relay starts, the yellow indicator I> inthe right bottom corner of the front panel of therelay module is lit, and when the relay trips itturns red.

Inverse time characteristic

At inverse time characteristic the operate time ofthe relay is measured at two current values (2 xI> and 10 x I>). The operate times thus receivedare compared with the operate times shown inthe current/time curves for the correspondinginverse time characteristic.

Blocking

Switches 4 and 5 of switchgroup SGB on the PCboard of the relay module are to be set inposition 1 (ON). Switch SGR/1 on the systempanel, too, has to be in position 1.

The blocking function is tested by applying acontrol voltage of the auxiliary voltage level toinput 10-11 via switch S2. At first switch S2 isclosed and then the test current is encreased wellabove the set start current level.The relay willstart, i.e. L2 is lit, but it must not operate, i.e. L3remains dark.

Testing of low-setcurrent stage I>

21

The switches of switchgroup SGR should be setas follows:

Switch Position

1 12 13 04 05 16 07 08 0

Then the following signals are linked to theoutput relays:

Output Function(terminals)

A (65-66) Tripping of stage I>B (68-69) (Tripping of stage I>>)C (80-81) Signal on tripping of stage I>

(LED L3)D (77-78) Start of stage I>> (LED L2)E (71-72) Signal on internal relay fault

(LED L1)

The high-set stage is tested in the same way asthe low-set stage. The clock measuring theoperate time is stopped by contact 68-69 whenoutput relay B operates.

N.B. High test currents are permitted for shortdurations only, because the wires, terminals andthe matching transformers of the relay have alimited current-carrying capability. The test leadsshould have an area of 4 mm2. Then a current of100 A can be connected to a 1 A energizinginput for 1 s and to a 5 A energizing input for10 s.

Testing ofhigh-set stage

Testing of the self-supervision system(IRF)

The self-supervision system and its operationindicator IRF and output relay E can be testedin the Trip-Test mode described in section

"General characteristics of C-type relay mod-ules" of this manual. The operation of outputrelay E is indicated by the LED indicator L1.

22

Maintenanceand repair

When used under the conditions specified inthe section "Technical data", the relay requirespractically no maintenance. The relay includesno parts or components that are liable to abnor-mal physical or electrical wear under normaloperating conditions.

If the environmental conditions on site differfrom those specified, as to temperature andhumidity, or if the atmosphere around the relaycontains chemically active gases or dust, therelay should be visually inspected during therelay secondary testing. The visual inspectionshould focus on:

- Signs of mechanical damage on relay case andterminals

- Dust accumulated inside the relay cover orcase; remove carefully with compressed air ora soft brush

- Signs of corrosion on terminals, case or com-ponents inside the relay

If the relay fails to operation or if the operationvalues considerably differ from those stated inthe relay specifications, the relay should be givena proper overhaul. Minor measures, such asexchange of a faulty module, can be undertakenby personnel from the customer’s instrumentwork-shop, but major measures involving meas-ures in the electronic circuitry are to be taken bythe manufacturer. Please contact the manufac-turer or his nearest representative for furtherinformation about checking, overhaul andrecalibration of the relay.

Note!The protection relays contain electronic circuitswhich are liable to serious damage due to elec-trostatic discharge. Before withdrawing a mod-ule from the relay case, ensure that you are at thesame electrostatic potential as the equipment bytouching the case.

Note!Static protection relays are measuring instru-ments and should be handled with care andprotected against damp and mechanical stress,especially during transport and storage.

Spare parts Three-phase overcurrent relay module SPCJ 3C3Combined power supply and I/O module- Uaux = 80...265 V ac/dc SPTU 240S1- Uaux = 18...80 V dc SPTU 48S1Case (including I/O module) SPTK 3E4I/O module SPTE 3E4Bus connection module SPA-ZC 17_ or SPA-ZC 21_

Orderingnumbers

Overcurrent relay without test adapterSPAJ 131 C RS 421 013 -AA, CA, DA, FA

Overcurrent relay with test adapter RTXP 18SPAJ 131 C RS 421 213 -AA, CA, DA, FA

The two last letters of the ordering number designate the rated frequency fn andthe Uaux voltage range of the relay as follows:

AA: fn = 50 Hz and Uaux = 80...265 V ac/dcCA: fn = 50 Hz and Uaux = 18...80 V dcDA: fn = 60 Hz and Uaux = 80...265 V ac/dcFA: fn = 60 Hz and Uaux = 18...80 V dc

23

Dimensions andinstructions formounting

The relay case is basically designed for flush-mounting. The mounting depth can be reducedby the use of a raising frame: type SPA-ZX 111reduces the depth behind the mounting panelby 40 mm, type SPA-ZX 112 reduces the depth

by 80 mm and type SPA-ZX 113 reduces thedepth by 120 mm. The relay can also be mountedin a case for surface mounting, type designationSPA-ZX 115.

Example1. Quantity and type designation 15 pces relay SPAJ 131 C2. Order number RS 421 013-AA3. Rated frequency fn = 50 Hz4. Auxiliary voltage Uaux = 110 V dc5. Accessories 15 bus connection modules SPA-ZC 21 MM

2 fibre optic cables SPA-ZF MM 10014 fibre optic cables SPA-ZF MM 5

6. Special requirements -

Order information

The relay case is made of profile aluminium andfinished in beige.

A rubber gasket fitted on the mounting collarprovides an IP54 degree of protection betweenrelay case and mounting panel, when the relay isflush mounted.

The hinged cover of the relay case is made of aclear, UV stabilized polycarbonate, and pro-vided with a sealable fastening screw. A gasket

along the edge of the cover provides an IP54degree of protection between the case and thecover.

All input and output wires are connected to thescrew terminal blocks on the rear panel. Eachterminal is dimensioned for one max. 6 mm2

wire or two max. 2.5 mm2 wires. The D-typeconnector connects to the serial communica-tion bus.

Fig. 9. Dimensions of the overcurrent relay SPAJ 131 C

Raising frame

SPA-ZX 111SPA-ZX 112SPA-ZX 113

176136 96

74114154

a b

a b

Panel cut-out

129 ±1

139

±1

142

162

136

3034

250

186216

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

SPCJ 3C3Overcurrent relay module


2

SPCJ 3C3Overcurrent

relay module

Contents Features .......................................................................................................................... 2Description of operation ................................................................................................. 3Block diagram................................................................................................................. 4Front panel ..................................................................................................................... 5Operation indicators ....................................................................................................... 5Settings ........................................................................................................................... 6Selector switches ............................................................................................................. 7Measured data ................................................................................................................ 9Recorded information ................................................................................................... 10Main menus and submenus of settings and registers ..................................................... 12Time/current characteristics (modified 2002-05) .......................................................... 13Technical data .............................................................................................................. 18Event codes ................................................................................................................... 19Remote transfer data ..................................................................................................... 20Fault codes .................................................................................................................... 23

Features Low-set overcurrent stage I> with selectabledefinite time or inverse definite minimum time(IDMT) operation characteristic

High-set current stage I>> with instantaneousoperation or definite time operation character-istic

Both overcurrent stages can be blocked by meansof an external control signals from cooperatingprotection relays

Digital display of measured and set values, re-corded fault values, operation indications andfault messages

Comprehensive serial communication capability

Continuous self-supervision of the electronicsand the software including autodiagnostics

1MRS 750602-MUM EN

Issued 1996-12-30Modified 2002-05-15Version D (replaces 34 SPCJ 2 EN1)Checked MKApproved OL


3

The overcurrent relay module SPCJ 3C3 can beused in single-phase, two-phase or three-phaseprotection relays and it contains two overcur-rent stages, i.e. a low-set overcurrent stage I>and a high-set overcurrent stage I>>.

The low-set or high-set overcurrent stage startsif the current on one of the protected phasesexceeds the set start value of the concerned stage.On starting, the concerned stage provides astarting signal SS1 or SS2 and simultaneouslythe operation indicator of the stage is lit withyellow light. If the overcurrent situation lastslong enough to exceed the set operation delay,the stage that started provides a tripping signal,TS1 or TS2. At the same time the operationindicator of the concerned stage is lit with redlight. The red operation indicator remains litalthough the protection stage resets. The yellowstart indications and the red operation indica-tions can be given self-reset or latching mode ofoperation. When the latching mode is selectedthe indicators are restet with the RESET push-button on the module's front panel or by thecommand V101 or V102 over the serial inter-face.

The operation of the low-set overcurrent stageI> can be blocked by routing a blocking signalBTS1 to the stage. Similarly, the operation ofthe high-set overcurrent stage I>> can be blockedby a blocking signal BTS2. The blockings areselected by means of switchgroup SGB on thePC board of the relay module.

If the protection relay incorporates an auto-reclose relay module, switchgroup SGB is addi-tionally used for the purpose of selecting thestart signals for the auto-reclose module. Theinstructions for selector switchgroup SGB aregiven in the general description of the pro-tection relay unit, in association with the dia-gram illustrating the signals between the relaymodules.

The operation of the low-set overcurrent stageI> can be based on definite time or inversedefinite minimum time (IDMT) characteristic.The required operation characteristic is selected

with switch SG1/3. At definite time character-istic the operation time t> can be selected withinone of the three available setting ranges of thestage. The operation time setting range is se-lected with switches SG1/1 and SG1/2. Wheninverse time characteristic (IDMT) is used fourtime/current curve groups with different slopesof inversity are available. The required charac-teristic is selected with switches SG1/1 andSG1/2.

The operation time t>> of the high-set overcur-rent stage is set separately. The setting range,one of three available, is selected by means ofswitches SG1/7 and SG1/8.

Normally both overcurrent stages are self-reset.With the selector switch SG1/4 both stages canbe given a so called latching function, whichmeans that the tripping output is kept energizedafter an operation though the fault has disap-peared, until separately reset. The outputs arereset by pressing the push-buttons STEP andRESET simultaneously or by the commandsV101 or V102 over the serial interface. See alsotable (switchgroup SG3) on page 9 in chapter"Selector switches".

The set start value of the high-set overcurrentstage I>> may be automatically doubled when theprotected object is energized, i.e. during a currentinrush situation. Thus the set start value of thehigh-set overcurrent stage can be lower than theconnection inrush current. The automatic dou-bling feature is selected with switch SG1/5. Astarting situation is defined as a situation wherethe phase currents increase from a value below0.12 x I> to a value exceeding 3.0 x I> in less than60 ms. The starting situation ceases when thephase currents fall below 2.0 x I>.

The setting range of the high-set overcurrentstage is selected with switch SG1/6. Two alter-natives setting ranges are available, 2.5...20 x Inand 0.5...4.0 x In. When the lower range ischosen the relay module will contain two almostidentical operation stages. In this case the over-current module SPCJ 3C3 may be used e.g. as atwo-stage load shedding module. The operationof the high-set overcurrent stage may be blockedby choosing the setting value ∞, infinite.

Description ofoperation

4

Block diagram

Fig. 1. Block diagram for the overcurrent relay module SPCJ 3C3.

IL1, IL2, IL3 Measured phase currentsBS1, BS2, BS3 External blocking signalsBTS1 Blocking signal for the tripping of stage I>BTS2 Blocking signal for the tripping of stage I>>SG1 Selector switchgroup on the front panelSG2 Function selector switchgroup for the operation indicatorsSGB Blocking signal selector switchgroup on the PC board and

starting signal selector switchgroup for the auto-reclose functionsSS1 Start signal of stage I>TS1 Trip signal of stage I>SS2 Start signal of stage I>>TS2 Trip signal of stage I>>AR1, AR2 Start signals for auto-reclose functionsY Yellow indicator, startingR Red indicator, tripping

NOTE!All input and output signals of the relay moduleare not necessarily wired to the terminals of anyprotection relay incorporating this module. Thesignals wired to the terminals are shown in the

diagram illustrating the interchange of signalsbetween the various modules of the protectionrelay.

5

Front panel

Simplified device symbol

Self-supervision systemalarm indicator

Display for set andmeasured values

Display step push-button

Selector switchgroup SG1

Indicator for switchgroupSG1, SG2 and SG3

Reset push-button

Start and operationindicatorsRelay module typedesignation

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Current measurement indicatorsfor phases L1, L2, L3

Indicator and start value settingknop of overcurrent stage I>

Indicator and operation time ortime multiplier k setting knob ofovercurrent stage I>

Indicator and start value settingknop of overcurrent stage I>>

Indicator and operation timesetting knop of overcurrentstage I>>

Fig. 2. Front panel of the overcurrent relay module SPCJ 3C3.

Operationindicators

Both overcurrent stages are provided with ayellow/red indicator. Yellow light indicates start-ing of the concerned overcurrent stage and redlight indicates that the overcurrent stage hasoperated (tripped).

The four indications, two starts and two trip-pings, can be given a self-reset mode of opersa-tion or manual reset mode. If, for instance, theyellow start indicator of the low-set overcurrentstage I> has been given the manual reset mode,the indicator is lit with yellow colour when theovercurrent stage starts and turning red whenthe stage operates. When the protection stagereturns to normal the yellow indication remainslit. The indicators that have been given themanual reset mode are reset by pushing theRESET push-button or by the command V101or V102 via the serial interface. The function ofthe relay module is not affected by an unresetoperation indicator.

When the display of the relay module is darkand one of the protection stages operates, the

indicators for the measured values of the moduleindicate the faulty phase, i.e. in which phase(s)the current has exceeded the setting value of thestage (so called phase fault indication). If, forinstance, the operation indicator of stage I> is litwith red light and the indicators IL1 and IL2 alsoare lit, the relay operation was caused by over-current on phases L1 and L2. The phase faultindications are reset by pushing the STEP push-button or the RESET push-button. See alsotable (switchgroup SG3) on page 9 in chapter"Selector switches".

The self-supervision alarm indicator IRF indi-cates that the self-supervision system has de-tected a permanent fault. The indicator is litwith red light shortly after a permanent internalfault has been detected. At the same time acontrol signal is put forward to the output relayof the self-supervision system. Additionally, inmost fault cases, a fault code indicating type offault appears on the display of the relay module.The fault code is to be recorded to serve thesubsequent fault location and repair actions.

6

The setting values are shown by the threerightmost digits of the display. When lit, the

indicator below a setting knob shows that theconcerned setting value is being displayed.

I>/In Set start current of stage I> as a multiple of the rated current In of the energizing inputused. Setting range 0.5...2.5 x In.

t> [s] The set start time of stage I>, expressed in seconds, when the definite time characteristick is used (SG1/3 = 0). The setting range is determined by the position of switches SG1/1

and SG1/2. Selectable setting ranges 0.05...1.00 s, 0.5...10.0 s and 5...100 s.

At inverse definite minimum time characteristic (SG1/3 = 1) the setting range of timemultiplier k is 0.05...1.00.

I>>/In Set starting current of stage I>> as a multiple of the rated current In of the energizing inputused. Setting range 2.5...20.0 x In, when SG1/6 = 0, and 0.5...4.0 x In, when SG1/6 = 1.Additionally, the setting infinite (displayed as - - -) can be selected, rendering the high-set stage I>> inoperative.

t>> [s] The set operation time of stage I>>, expressed in seconds. The setting ranges, 0.04...1.00 s,0.4...10.0 s and 4...100 s, are determined by the position of switches SG1/7 and SG1/8, seebelow.

Settings

Further, the checksum of the selector switch-group SG1 is indicated on the display when theindicator under the switchgroup is glowing. Inthis way a checked can be carried out to provethat the switches have been set and that the

switches themselves work properly. An exampleof calculating the checksum is given in thedescription "General characteristics of C-typerelay modules".

7

Selector switches Additional functions required by individual ap-plications are selected by means of the selectorswitches of switchgroup SG1 located on the

front panel. The numbering of the switches1...8, as well as the switch positions 0 and 1 aremarked on the front panel.

Switch Function

SG1/1 Switch SG1/3 is used for choosing the operation characteristic of the low-set currentSG1/2 stage I>, i.e. definite time or inverse definite minimum time (IDMT) characteristic.SG1/3 At definite time mode characteristic the setting range of the operation time t> is

selected by means of switches SG1/1 and SG1/2, whereas, at inverse definite minimumtime characteristic the switches are used for choosing the current/time characteristicof the overcurrent stage.

SG1/1 SG1/2 SG1/3 Characteristic Operation time t> ortype of characteristic

0 0 0 Definite time 0.05...1.00 s1 0 0 " 0.5...10.0 s0 1 0 " 0.5...10.0 s1 1 0 " 5...100 s

0 0 1 IDMT Extremely inverse1 0 1 " Very inverse0 1 1 " Normal inverse1 1 1 " Long-time inverse

SG1/4 Selection of the latching function for the tripping signals TS1 and TS2.

When SG1/4 = 0, the tripping signals return to normal (= the output relay resets, whenthe energizing input signal causing the operation falls below the start level.When SG1/4 = 1, the tripping signals remain on (= output relay energized), althoughthe energizing input signal falls below the starting level. The latched tripping signalsare reset by pressing the push-buttons STEP and RESET simultaneously or with thecommand V101. When the STEP and RESET push-buttons are pushed the recordedvalues are erased as well. *)

SG1/5 Selection of automatic doubling of the setting value of the high-set overcurrent stagewhen the protected object is connected to the network.

When SG1/5 = 0, no doubling of the set start value of stage I>> is obtained.When SG1/5 = 1, the set start value of stage I>> doubles automatically. The doublingfeature makes it possible to give the high-set current stage a setting value, which islower than the connection inrush current of the protected object.

SG1/6 Selection of the start current setting range of the high-set overcurrent stage I>>.

When SG1/6 = 0, the setting range is 2.5...20 x In and ∞, infinite.When SG1/6 = 1, the setting range is 0.5...4 x In and ∞, infinite.When SG1/6 =1, the module comprises two almost identical overcurrent stages andmay in this case be used for load shedding purposes. The setting ∞, infinite, isindicated by - - - on the display.

*) From the program version 052 C and later an additional switchgroup (SG3) has been incorpratedinto the relay module. When the latching function is used the latched output can be resetby pushing the RESET button alone, if SG3/3=1, or by pushing the STEP button alone, ifSG3/2=1, in which case the stored information of the module is not erased.

8

Switch Function

SG1/7 Selection of the setting range of the operation time t>> of the high-set overcurrentSG1/8 stage I>>.

SG1/7 SG1/8 Operation time t>>

0 0 0.04...1.00 s1 0 0.4...10.0 s0 1 0.4...10.0 s1 1 4...100 s

Switchgroup SG2 is a so called software switch-group, which is located in the third submenu ofswitchgroup SG1. In switchgroup SG2 the modeof operation of the LED indicators is selected.The start and operation indicators of the low-setand the high-set overcurrent stage can be givenself-reset mode of operation or latching mode ofoperation. The selection is made by means of a

checksum which is calculated from the tablebelow. Normally the start indications are self-reset and the operation indications latching.

If the checksum of switchgroup SG2 = 0 noLED indications are obtained after a fault, i.e.no start or operation indications I> or I>> norphase indications IL1, IL2 or IL3.

Indication Latching Default

Starting, stage I>, yellow 1 0Tripping, stage I>, red 2 2Starting, stage I>>, yellow 4 0Tripping, stage I>>, red 8 8

Checksum 15 10

9

Switchgroup SG3 is a so called software switch-group, which is located in the fourth submenuof switchgroup SG1. The front panel push-

buttons STEP and RESET can be programmedwith switches SG3/1…3. Switches SG3/4…8are not in use. The default value for SG3 is 0.

SG3/1 SG3/2 SG3/3 Push-button Clear Reset Erasestart/trip latched memorizedLED's relays values

STEP0 0 0 RESET x

STEP & RESET x x x

STEP x1 0 0 RESET x

STEP & RESET x x x

STEP x x0 1 0 RESET x

STEP & RESET x x x

STEP0 0 1 RESET x x

STEP & RESET x x x

STEP x1 0 1 RESET x x

STEP & RESET x x x

The PC board of the relay module holds aswitchgroup SGB including switches 1...8.Switches 1...3 are used for selecting the startingsignals for a possible auto-reclose module,whereas switches 4...8 are used for routing

blocking signals to the overcurrent module invarious protection relays. The functions of theselector switchgroup SGB is described in thegeneral part of the manual of the concernedprotection relay.

Measured data The measured values are displayed by therightmost three digits on the display. The rele-

vant measured data are indicated by a lit indica-tor on the front panel.

Indicator Measured data

IL1 Line current on phase L1 as a multiple of the rated current In.



NOTE! The rated current In is the rated current of the energizing input taken in use in the concernedprotection relay.

10

Recordedinformation

The leftmost digit of the display shows theaddress of the register and the three rightmost

digits the recorded information. The addressdigit is recognized by its red colour.

Register/ Recorded informationSTEP

1 Maximum phase current measured as a multiple of the rated current of the protectionrelay. If the module operates, the current value at the moment of operation is storedin the memory. A new tripping erases the old value and updates the register with thenew value. The same thing happens if the current exceeds a previously registeredmaximum value.

In the 1.st submenu the current value measured at the last operation is recorded.

2 Number of startings of the low-set overcurrent stage I>, n (I>) = 0...255.

3 Number of startings of the high-set overcurrent stage I>>, n (I>>) = 0...255.

4 Duration of the latest starting situation of stage I> as a percentage of the set operationtime t> or at IDMT mode of operation the calculated operation time. A new startingresets the counter which thus always contains the value from the latest starting. Whenthe stage has operated, the counter reading is 100.

5 Duration of the latest starting situation of stage I>> as a percentage of the set operatingtime t>>. A new starting resets the counter which thus always contains the value fromthe latest starting. When the stage has operated, the counter reading is 100.

0 Display of blocking signals and other external control signals. The leftmost digitindicates the state of the blocking inputs of the module. The following states may beindicated:0 = no incoming blockings1 = operation of stage I> blocked2 = operation of stage I>> blocked3 = operation of both stages blocked

In this register the middle green digit of the display is always zero. The leftmost greendigit indicates the state of the remote reset input, if any. The following states maybe indicated:0 = remote reset control input not energized1 = remote reset control input energized

From this register it is possible to move on to the TEST mode, where the start andoperation signals of the module can be activated one by one. For further details seethe description "General characteristics of C-type relay modules".

11

Register/ Recorded informationSTEP

A The address code of the protection relay module, required by the serial communicationsystem. If the address code is set at zero the serial communication is out of use.The submenus in this register are:

1) Selection of data transfer rate for the serial communication.Selectable values: 300, 1200, 2400, 4800 or 9600 Bd. Default value 9600 Bd.

2) Bus communication counter. If the module is connected to a data communica-tion device and the communication system is working, the communicationcounter shows 0. If the communication is interrupted the numbers 0…255 isscrolling in the display.

3) Password required for the remote control of relay settings

- Display dark. By pressing the STEP push-button the starting point of the displaymenu obtained.

The values of the registers 1...5 are erased bypressing the push-buttons STEP and RESETsimultaneously or with the command V102.The register values are also erased if the auxiliarypower supply of the module is interrupted. Theaddress code of the relay module, the value of

the data transfer rate of the serial communica-tion and the password are not erased by anauxiliary voltage interruption. The instructionsfor setting the address and the data transfer rateare given in the description "General character-istics of C-type relay modules".

12

Main menus andsubmenus ofsettings andregisters

The diagram below shows the available mainmenus and submenus of the overcurrent relaymodule SPCJ 3C3.

Normal state, display switched off

21

Remotely set opera-tion time t>> x p4Operation time t>> of stage I>> 21

Checksum of switchgoup SG1

Remotely setpercentage p4

1

Set start current of stage I>>

Operation time t> ortime multiplier k of stage I>

SUBMENUSTEP FORWARDS 1 sSTEP BACKWARDS 0.5 s

MAIN

MENU

STEP

BACKWARDS

.5s

STEP

FARWARDS

1s

MAIN MENU SUBMENU

STEP 0.5 s RESET 1 s

1

2

Stored maximum phase current value Current value at last operation1

Current on phase L1

Current on phase L2

Current on phase L3

Set start current of stage I>

2 Remotely setchecksum of SG1

1 Remotely setchecksum of SG1

2

Remotely set start current value I>> x p3

Remotely set value t> x p2 or k x p2

Remotely set start current value I> x p1




1

Number of starts of the low-set stage I>2

3

Duration of the last start event of stage I>

5

4

Status of the external blocking /control input0

Address code of the relay moduleA

0 000

Data transfer rate [Bd]1

Number of starts of the high-set stage I>>

SS1 TS1 TS2IRF SS2

Bus communicationmonitor 0..255 s2 Password for

remote setting3

Duration of the last start event of stage I>>

= value that can be set in the setting mode

3 SG2 4 SG3

Instructions for entering a submenu or thesetting mode, procedures for doing the settingsand for handling the TEST mode are given in

the manual "General characteristics of C-typerelay modules".

13

The slope of the time/current curves is deter-mined by the values of the constants α and β:

Characteristic of the α β time/current curves

Normal inverse 0.02 0.14 Very inverse 1.0 13.5 Extremely inverse 2.0 80.0 Long-time inverse 1.0 120.0

According to the standard BS 142 of 1966 anormal current range is defined as 2...20 timesthe setting. Additionally the relay must start atthe latest when the measured current exceeds1.3 times the set start current, when the time/current characteristic is normal inverse, veryinverse or extremely inverse. At long-time in-verse characteristic, the normal range accordingto the standard is 2...7 times the set start currentand the relay is to start when the current exceeds1.1 times the set start current.

The following requirements with regard to op-eration time tolerances are specified in the stand-ard, where E denotes accuracy in per cent, - = notspecified:

I/I> Normal inverse Very inverse Extremely inverse Long-time inverse

2 2.22 E 2.34 E 2.44 E 2.34 E 5 1.13 E 1.26 E 1.48 E 1.26 E 7 - - - 1.00 E

10 1.01 E 1.01 E 1.02 E -20 1.00 E 1.00 E 1.00 E -

Over the normal current ranges, the inverse-time stage of the overcurrent module SPCJ 3C3complies with the tolerances of class 5 for allfour characteristics.

The time/current characteristics specified in thestandards are illustrated in Fig. 3, 4, 5, and 6.

Note.The actual operate time of the relay, presentedin the graphs in Fig. 3…6, includes an addi-tional filter and detection time plus the operatetime of the trip output relay. When the operatetime of the relay is calculated using the math-ematical expression above, these additional timesof about 30 ms in total have to be added to thetime received.

Time/currentcharacteristics(modified 2002-05)

The operation of the low-set current stage I> ofthe overcurrent module is based on either defi-nite time or inverse time characteristic. Theoperation characteristic is selected with switch 3of switchgroup SG1, see page 7.

When an I.D.M.T. characteristic is chosen, theoperation time of the low-set overcurrent stageI> will be a function of the current; the higherthe current, the shorter the operation time. Therelationship between current and time complywith the standards BS 142 of 1966 and IEC60255-3 and may generally be expressed as:

t = [s]

where t = operation time in secondsk = time multiplierI = measuring currentI> = set start current

The module includes four characteristics withdifferent slopes. The characteristic to be used ischosen with switches 1 and 2 of switchgroupSG1, see page 7.

k x β I α

I>( ) –1

14

Inverse-timecharacteristics ofovercurrent relaymodule SPCJ 3C3.

Fig. 3. Extremely inverse characteristic.

I = measured currentI> = set start currentt = operation timek = time multiplier

1 3 4 5 6 7 8 9 102 20 I/I>

0.05

0.1

0.2

0.3

0.4

0.6

0.8

1.0

k

0.02

0.03

0.04

0.05

0.06

0.070.080.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

789

10

20

30

40

70

60

50

t/s

15

Fig. 4. Very inverse characteristic.


1 2 3 4 5 6 7 8 9 10 20 I/I>

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.70.80.91.0

k

0.02

0.03

0.04

0.05

0.06

0.070.080.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

789

10

20

70

60

50

40

30

t/s

16

Fig. 5. Normal inverse characteristic.

I = measured currentI> = set currentt = operation timek = time multiplier

0.05

0.1

0.2

0.3

0.4

0.5

0.60.70.80.91.0

k

1 2 3 4 5 7 8 9 10 20 I/I>60.02

0.03

0.04

0.05

0.06

0.070.080.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

789

10

20

30

40

50

60

70

t/s

17

Fig. 6. Long-time inverse characteristic.


1 2 3 4 5 10 206 7 8 9 I/I>

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.70.80.91.0

k

0.2

0.3

0.4

0.5

0.6

0.70.80.9

1

2

3

4

5

6

7

89

10

20

30

40

50

60

708090

100

200

300

400

500

600

700

t/s

18

Technical data Low-set overcurrent stage I>Start current I> 0.5...2.5 x InStart time, typically 55 msOperate time t> at definite timecharacteristic 0.05...1.00 s, 0.5...10.0 s or

5...100 sTime/current curves at inversetime characteristic (IDMT) Extremely inverse

Very inverseNormal inverseLong-time inverse

Time multiplier k 0.05...1.00Reset time, typically 60 msRetardation time <30 msDrop-off/pick-up ratio, typically 0.96Operation time accuracy atdefinite time operation characteristic ±2% of set value or ±25 msOperation time accuracy class E atinverse time mode of operation 5Operation accuracy ±3% of set value

High-set overcurrent stage I>>Start current I>> 2.5...20.0 x In & ∞, infinite or

0.5...4.0 x In & ∞, infiniteStart time, typically 40 msOperation time t>> 0.04...1.00 s, 0.4...10.0 s or

4...100 sReset time, typically 60 msRetardation time <30 msDrop-off/pick-up ratio, typically 0.96Operation time accuracy ±2% of set value or ±25 msOperation accuracy ±3% of set value

19

E1...E8 are represented by the numbers 1, 2,4...128. The event mask is formed by multiply-ing, one by one, the above numbers either with0 (event not included in the reporting) or 1(event included in the reporting) and adding theproducts, check for the procedure for calculat-ing the checksum.

The event mask may take a value within therange 0...255. The default value of the relaymodule SPCJ 3C3 is 85, which means that allstart and trip signals are included in the report-ing, but not the resetting. The event codesE50...E54 and the events represented by thesecannot be excluded from the reporting.

Event codes for the overcurrent relay moduleSPCJ 3C3:

Event codes The substation level control data communica-tor is able to read, over the SPA serial bus, theevent data of the protection module of the relay,e.g. start and trip information. Event informa-tion that have been read are printed out in theformat: time (ss.sss) and event code. The eventcodes of the relay module SPCJ 3C3 are denotedE1...E8, E50 and E51. Additional event codes,i.e. E52…E54, are generated by the control datacommunicator. These event codes are, for in-stance, related to the data communication.

The event codes E1...E8 and the events repre-sented by these can be included in or excludedfrom the event reporting by writing, over theSPA-bus, an event mask (V155) to the relaymodule. The event mask is a binary numbercoded to a decimal number. The event codes

Code Event Number Factory setrepresenting default valuethe event

E1 Starting of stage I> 1 1E2 Reset of starting of stage I> 2 0E3 Tripping of stage I> 4 1E4 Reset of tripping of stage I> 8 0E5 Starting of stage I>> 16 1E6 Reset of starting of stage I>> 32 0E7 Tripping of stage I>> 64 1E8 Reset of tripping of stage I>> 128 0E50 Restarting * -E51 Overflow of event register * -E52 Temporary disturbance of the data communication * -E53 No response from the relaymodule over the data

communication * -E54 The relay module responds again over the data

communication * -

0 not included in the event reporting1 included in the event reporting* no code number- cannot be programmed

20

and some other data. Further, part of the datacan be altered by commands given over the SPAbus. Any information is located on channel 0,which needs not to be written in the data com-munication instructions.

Remote transferdata

Apart from the event codes the control datacommunicator is able to read, over the SPA bus,all input data (I data) of the relay module, setvalues (S values), output status data (O data)information recorded in the memory (V data),

Data Code Data Valuesdirect.

Current on phase L1 as a multiple I1 R 0...63 x Inof the rated currentCurrent on phase L2 as a multiple I2 R 0...63 x Inof the rated currentCurrent on phase L3 as a multiple I3 R 0...63 x Inof the rated currentBlocking of tripping of stage I> I4 R 0 = no blocking

1 = tripping of stage I> blockedBlocking of tripping of stage I>> I5 R 0 = no blocking

1 = tripping of stage I>> blocked

Starting of stage I> O1 R 0 = stage I> has not started1 = stage I> started

Tripping of stage I> O2 R 0 = stage I> not tripped1 = stage I> tripped

Starting of stage I>> O3 R 0 = stage I>> not started1 = stage I>> started

Tripping of stage I>> O4 R 0 = stage I>> not tripped1 = stage I>> tripped

Alerted start value for stage I> S1 R 0.5...2.5 x InAlerted operation time for stage I> S2 R 0.05...100 sor time multiplier k 0.05...1.00Alerted start value for stage I>> S3 R 0.5...20 x In

999 = ∞, infiniteAlerted operation time for stage I>> S4 R 0.04...100 sAlerted checksum of switchgroup SG1 S5 R 0...255

Start value of stage I>, set with S11 R 0.5...2.5 x Inthe setting knobOperation time or time multiplier of S12 R 0.05...100 sstage I>, set with the setting knob 0.05...1.00Start value of stage I>>, set with S13 R 0.5...20 x Inthe setting knob 999 = ∞, infiniteOperation time of stage I>>, set S14 R 0.04...100 swith the setting knobChecksum of switchgroup SG1, S15 R 0...255set with the switches

Remote setting percentage of the S21 R, W 0...999%start value of stage I>Remote setting percentage of the S22 R, W 0...999%operation time or time multiplierof stage I>Remote setting percentage of the S23 R, W 0...999%start value of stage I>>Remote setting percentage of the S24 R, W 0...999%operation time of stage I>>Remotely set checksum for the S25 R, W 0...255switchgroup SG1

21


Remotely set start value of stage I> S31 R 0.5...2.5 x InRemotely set operation time value S32 R 0.05...100 sor time multiplier of stage I> 0.05...1.00Remotely set start value of stage I>> S33 R 0.5...20 x In

999 = ∞, infiniteRemotely set operation time value S34 R 0.04...100 sof stage I>>Remotely set checksum of switch- S35 R 0...255group SG1

Max. measured current or current V1 R 0...63 x Invalue at relay operationNumber of starts of stage I> V2 R 0...255Number of starts of stage I>> V3 R 0...255Duration of the latest start V4 R 0...100%situation of stage I>Duration of the latest start V5 R 0...100%situation of stage I>>Phase data recorded at the V6 R 1 = IL3>, 2 = IL2>, 4 = IL1>,latest triping occasion 16 = IL3>>, 32 = IL2>>,

64 = IL1>> + combinationsCurrent value at relay operation V7 R 0…63 x In

Resetting of output relays and V101 W 1 = output relays and operationoperation indicators indicators are resetResetting of output relays and V102 W 1 = output relays and operationoperation indicators and erasing indicators are reset andof recorded data registers (codes V1...V7)

are erased

Remote control of settings V150 R, W 0 = setting with knobs S11...S15alerted

1 = remote settings S31...S35alerted

Event mask word V155 R, W 0...255, see paragraph"Event codes"

Manual or automatic resetting of V156 R, W 0…15, see paragraphLED indicators (SG2) "Selector switches"Programming push-buttons (SG3) V157 R, W 0…7, see paragraph

"Selector switches"

Opening of password for remote V160 W 1...999setting of module parametersRenaming or closing of password V161 W 0...999for remote setting of parameters

Activation of the self-supervision V165 W 1 = self-supervision output issystem output activated and IRF indicator

turns on in about 5 seconds,whereafter the self-supervi-sion system and the IRFindicator reset.

Fault code number V169 R 0…255

22


Data communication address of V200 R, W 1...254the relay module

Program version number V205 R e.g. 052 B

Relay module type designation F R SPCJ 3C3

Reading of event register L R Time, channel number andevent code

Re-reading of event register B R Time, channel number andevent code

Reading of relay module state data C R 0 = normal state1 = module been subject to

automatic reset2 = overflow of event register3 = events 1 and 2 together

Resetting of module state data C W 0 = resetting

Time reading and setting T R, W 00.000...59.999 s

R = data to be read from the unitW = data to be written to the unit

The data transfer codes L, B, C and T have beenreserved for the event data transfer between therelay module and the substation level controldata communicator.

The event register can be read only once by theL command. Should a fault occur, for instance,in the data transfer, it is possible, by using the Bcommand, to re-read the contents of the eventregister once read by means of the L command.When required the B command can be re-peated.

The set values S1...S5 are the alerted set valuescurrently used by the relay. These values can beset either by means of the setting knobs andselector switches or by remote control. Thevalues S11...S15 are set with the setting knobsand the switches of the relay module. The valuesS21...S25 are percentage factors to be multi-plied by the set values given with the setting

knobs. The set values S21...S25 can be bothread and written. A condition for writing is thatthe password, V160, for remote setting has beenopened and the potentiometer settings must bevalid, V150=0. The variables S31...S35 containthe actual remotely set values.

The remote setting percentage of variablesS21...S24 can be given a percentage value withinthe range 0...999. This means that set valuesoutside the limits of the specified setting rangecan be given to a certain parameter. However,the proper operation of the relay is guaranteedonly for set values within the setting range limitsspecified in the technical data.

Activation of the self-supervision input (V165)prevents the relay from operating as long as theself-supervision input is active and the IRFindicator is lit.

23

After an operation the relay module indicates bymeans of variable V6 the phases (phase indica-tion) which have exceeded the setting value ofthe low-set stage or the high-set stage at themoment of operation. The same data are indi-cated by the LED indicators of the module, seesection "Operation indicators". The data are

binary numbers coded to decimal numbers, sothat, for the low-set overcurrent stage as well asfor the high-set overcurrent stage, each phase isrepresented by a specific number. The final codeis obtained by adding the separate phase codenumbers.

Coding of phase fault data:

Fault Codenumber

Low-set stage I> set value exceeded on phase L3 1Low-set stage I> set value exceeded on phase L2 2Low-set stage I> set value exceeded on phase L1 4High-set stage I>> set value exceeded on phase L3 16High-set stage I>> set value exceeded on phase L2 32High-set stage I>> set value exceeded on phase L1 64

For instance when V6 = 7 (1 + 2 + 4), the low-set current stage has operated (tripped) and thecurrent on each phase has exceeded the set startvalue of the low-set stage I>.

Register data V6 includes two separate parts,one for the low-set overcurrent stage and one forthe high-set overcurrent stage. If the low-setovercurrent stage operates, the value of registerV6 is updated with regard to the codes 1, 2 and

4 only. If the high-set overcurrent stage oper-ates, only the codes 16, 32 and 64 are updated.A new value always erases the old recordedvalue.

Register V6 can be set to zero either by pushingthe buttons STEP and RESET simultaneouslyor by giving the variable V102 the value 1 via theSPA bus.

Fault codes Shortly after the self-supervision system hasdetected a permanent internal fault the red faultindicator IRF on the relay module front panel islit. At the same time the self-supervision systemputs forward a control signal to the output relayof the self-supervision system. Further, in mostfault situations a self-diagnostic fault code isshown on the display of the relay module. Thefault code is composed of a red number one (1)

and a green, one or two digit code number. It isrecommended that the fault code number isnoted down and passed forward to the serviceshop when overhaul and repair of the faultyrelay module is ordered.

The three-phase overcurrent relay module SPCJ3C3 may display the following fault codes:

Fault code Type of fault

4 Trip signal path broken or output relay module missing30 Faulty program memory (ROM)50 Faulty random access memory (RAM)

195 Too low a value on the reference channel with multiplier 1131 Too low a value on the reference channel with multiplier 5

67 Too low a value on the reference channel with multiplier 25203 Too high a value on the reference channel with multiplier 1139 Too high a value on the reference channel with multiplier 5

75 Too high a value on the reference channel with multiplier 25253 No interruptions from the D/A converter

L1 IRF

>I

L2I L3II

1309

[ ]sk

>t0.5

0.05 1.0

13

2.5

0.5

0.04 1.0

0.5

1.5

2.5

STEP

RESET

SG1

0 1

1234567820

STEP

>>I

nI>I

nI>>I

>>t [ ]s

>I >>I

SPCJ 3C3

B

Indicators for measured values

Setting knob 1with indicator

Stage 1



Stage 2


Self-supervision alarm indicator(Internal Relay Fault)

Display, 1 + 3 digits

Step push-button (STEP)

Programming switches SG1

Switchgroup indicator

Reset push-button (RESET)

Start/operation indicators

General characteristics ofC-type relay modules


2

General characteristics ofC-type relay modules

Contents Push-buttons .................................................................................................................. 2Programming switches SG1 ............................................................................................ 2Setting knobs .................................................................................................................. 3Display ........................................................................................................................... 3

Display main menu ................................................................................................... 3Display submenu ....................................................................................................... 4Setting mode ............................................................................................................. 4Example: Operation in setting mode ......................................................................... 5Stored information .................................................................................................... 6Trip-test mode........................................................................................................... 7Example: Trip-test function ...................................................................................... 8

Operation indicators ....................................................................................................... 9Fault codes ...................................................................................................................... 9

Push-buttons The front panel of the relay module containstwo push-buttons. The STEP button is used forstepping forward in the display and the RESETbutton for resetting the red indicators. Addi-tionally, the push-buttons are used for certain

settings, e.g. for setting the address of the relaymodule and the data transfer rate for the serialcommunication when the modules are used inrelay packages provided with this quality. (Seesection Display).

Programmingswitches SG1

Part of the settings and the selections of theoperating characteristics for the relay modulesin various applications are made with the pro-gramming switches SG1 on the front panel. Theindicator of the switchgroup glows when the

checksum of the switchgroup is shown on thedisplay. The checksum can be used for checkingthat the switches are properly set. Fig. 2 gives anexample of calculating the checksum.

Fig. 2. Example of calculating the checksum of programming switchgroup SG1.

When the checksum calculated according to theexample is equal to the checksum indicated onthe display of the relay module, the switches areproperly set.

The function of the programming switches ofthe individual measuring relay modules is speci-fied in the description of the module concerned.

1MRS 750328-MUM EN

Issued 96-02-19Version A (replaces 34 SPC 2 EN1)Checked L-W UApproved TK


3

Setting knobs Most of the operating values and operatingtimes are set by means of the setting knobs onthe front panel of the relay module. Each settingknob has its own (LED) indicator which glowswhen the concerned setting value is shown onthe display.

If a setting knob is turned while the display isshowing another measured or set value, thevalue being set automatically appears on thedisplay. Simultaneously, the indicator for theconcerned setting starts glowing.

In addition to the settings made with the settingknobs, most modules allow so called remotesetting. This means that the settings made bymeans of the setting knobs of the module andthe checksum of the programming switchgroupmay be altered through an instruction over theserial communication bus. Remote setting ispossible if the password in the register A isknown, and the remote settings are not acti-vated, i.e. parameter V150=0. The circumstancethat the remote settings are activated is shownwith a flashing light of the indicator of thesetting knob, the value of which currently isbeing displayed.

Display The measured and set values as well as the datarecorded are shown on the display of the meas-uring relay module. The display consists of fourdigits. The three digits (green) to the rightindicate the measured, set or stored value andthe digit at the extreme left (red) the number ofthe register. The measured or set value displayedis indicated by a yellow LED indicator. Thenumber of the register glows only when a storedvalue is displayed.

When the auxiliary voltage is connected to ameasuring relay module, the module initiallytests the display by stepping through the digits1...9 for about 15 seconds. When the test isfinished the display turns dark. The testing canbe interrupted by pressing the STEP button.The protective functions of the module areoperative throughout the testing.

Display main menu All the data required during normal operatingconditions are accessible from the main menuwhich presents the measured values in real-time,the normal setting knob settings as well as themost important memorized data.

The data to be shown in the main menu areselected to the display in a certain sequence bymeans of the STEP button. When pressing theSTEP button for about one second, the displaymoves forward in the display sequence. Whenpressing it for about 0.5 seconds, the displaymoves backwards in the display sequence.

From a dark display only forward movement ispossible. When keeping the STEP button de-pressed, the display is continuously moving inforward direction stopping for a while at thedark point.

Unless the display is switched off by stepping tothe dark point, it remains activated for about 5minutes from the last pressing of the STEPbutton and then goes out.

4

Display submenu Less important values and values not very oftenset are displayed in the submenus. The numberof submenus varies with different relay moduletypes. The submenus are presented in the de-scription of the concerned module.

A submenu is entered from the main menu bypressing the RESET button for about one sec-ond. When the button thereafter is released, thered digit (STEP) of the display starts flashing,indicating that one is in a submenu. Going fromone submenu to another or back to the mainmenu follows the same principle as when mov-ing from the main menu display to another; the

display moves forward when pressing the STEPbutton for one second and backward whenpressing it for 0.5 seconds. The return to themain menu has taken place when the red STEPdisplay turns dark.

When entering a submenu from a measured orset value indicated by a LED indicator, theindicator remains glowing and the address win-dow (STEP) of the display starts flashing. Aflashing address window when no LED indica-tor is lit indicates that the submenu of a registerhas been entered.

Fig. 3. Example of the main and submenus for the settings of the overcurrent relay module SPCJ3C3. The settings made with the setting knobs are in the main menu and they are displayed bypressing the STEP button. In addition to the setting knob settings the main menu contains themeasured current values as well as the registers 1…5, as well as 0 and A. The remote settingpercentage and remote setting value are located in the submenus for the settings and are activatedon the display by pressing the RESET button.

Setting mode The registers of the main menu and the submenusalso contain parameters to be set. The settingsare made in the so called setting mode, which isaccessible from the main menu or a submenu bypressing the RESET button, until the digit atthe extreme right starts flashing (about 10 s).The flashing digit is set by means of the STEPbutton. The flashing is moved on from digit todigit by pressing the RESET button.

A set value is stored in the memory by pressingthe push-buttons STEP and RESET simultane-ously. In practice the RESET button must be

pressed slightly in excess of the STEP button.Return from the setting mode to the main menuor submenu is possible by pressing (for about 10s) the RESET button until the green digits onthe display stop flashing. If the module is left inthe setting mode, it will return automatically tothe start condition after about 5 minutes.

The values to be set in the setting mode are forinstance the address code of the relay moduleand the data transfer rate for the serial commu-nication. Further the percentage values for theremote settings can be changed.

5

Example 1: Function in the setting mode. Manual setting ofthe address code of a relay module and the datatransfer rate for the serial communication. Theinitial value for the address code is 146.

a)Press push-button STEP until register address Aappears on the display.

b)Press the RESET button for about 10 s until theright most digit starts flashing.

c)Press the STEP button repeatedly to set the digitto the value desired.

d)Press the RESET button to make the middle ofthe green digits flash.

e)Set the middle address digit by means of theSTEP button.

f)Press the RESET button to make the left mostgreen digit flash.

g)Set the digit by means of the STEP button.

h)Store the set address number in the memory ofthe relay module by pressing the RESET andSTEP button simultaneously. At the momentthe information enters the memory, the threegreen dashes flash in the display, i.e. A—.

i)Leave the setting mode by pressing the RESETbutton for about 10 s, until the display stopsflashing.

j)Then enter submenu 1 of register A by pressingthe RESET button for approx. one second. Theregister address A is then replaced by a flashing1. This submenu is used for setting the datatransfer rate of the serial communication.

k)The data transfer rate for the serial communica-tion is set and stored in the same way as theaddress, see sections b...i, except that the con-tinuously glowing register address has been re-placed by a flashing 1.

l)After storing the data transfer rate for the serialcommunication you may return to the mainmenu of register A by pressing the STEP buttonfor about 0.5 second.

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Stored information The parameter values measured at the momentwhen a fault occurs are recorded in the registers,in some modules also the setting values. Therecorded data, except for some setting param-eters, are set to zero by pressing the push-buttons STEP and RESET simul-taneously.The data in normal registers are erased if theauxiliary voltage supply to the relay is disrupted,only the set values and the number ofautoreclosings are maintained in the registers ata voltage failure.

The number of the registers varies with differentmodule types. The function of the registers areillustrated in the descriptions of the separaterelay modules. Additionally, the system panelcontains a simplified list of the data recorded bythe various relay modules of the relay assembly.

All C-type relay modules are provided with twogeneral registers: register 0 and register A.

Register 0 contains, in coded form, the informa-tion about e.g. external blocking signals andstatus information for the circuit breaker. Thecodes are explained in the descriptions of therelay modules.

Register A contains the address code of the relaymodule as required by the serial communicationsystem. Example 1 on page 4 shows how theaddress code is altered. Submenu 1 of register Acontains the data transfer rate value expressed inkilobaud for the serial communication.

Submenu 2 of register A contains a bus trafficmonitor for the SPACOM system. If the protec-tive relay, which contains the relay module, islinked to a system including the control datacommunicator and the data communicationsystem is operating, the counter reading of themonitor will be zero. Otherwise the digits 1...255are continuously rolling in the monitor.

Submenu 3 contains the password required forchanging the remote settings. The address code,the data transfer rate for the serial communica-tion and the password can be set manually or viathe serial communication bus. For manual set-ting see example 1.

The start value for the address code and thepassword is 001 and that for the data transferrate 9.6 kilobaud.

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Trip-test mode Register 0 also allows access to the so calledTrip-test function, which allows the outputsignals of the relay module to be activated one byone. If the auxiliary relay module of the protec-tion assembly is in place, the auxiliary relays willbe included in the testing.

When pressing the RESET button for about 10seconds, the three green digits to the right startflashing to indicate that the relay module is intest position. The indicators of the setting knobsindicate by flashing which output signal can beactivated. The required output function is se-lected by pressing the RESET button for about1 second, until the following LED indicatorstarts flashing.

The indicators of the setting knobs refer to thefollowing output signals:Setting knob 1 SS1 Starting of stage 1Setting knob 2 TS1 Tripping of stage 1Setting knob 3 SS2 Starting of stage 2Setting knob 4 TS2 Tripping of stage 2No indication IRF Self-supervision

The selected starting or tripping is activated bysimultaneous pressing of the push-buttons STEPand RESET. The signal remains activated aslong as the two push-buttons are being pressed.

The self-supervision output is activated by press-ing the STEP button once when no setting knobindicator is flashing. The IRF output is acti-vated in about 5 seconds after pressing of theSTEP button, and resets after that. Simultane-ously, the display returns to the main menu andperforms the initial testing indicated by rollingdigits 0...9 in the display several times.

The signals are selected in the order illustrated infig. 4.

REGISTER 0IRF SS1 TS1 SS2 TS2

STEP STEP+RESET

STEP+RESET

STEP+RESET

STEP+RESET

RESET10 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

RESET1 s

Fig. 4. Sequence order for selecting the output signals in the Trip-test mode.

If e.g. the indicator of the setting knob 2 (secondfrom the top) is flashing, and the push-buttonsSTEP and RESET are being pressed, the signalTS1 (tripping of stage 1) is activated. Return tothe main menu is possible at any stage of the

Trip-test sequence scheme, by pressing theRESET button for about 10 seconds. If themodule is left in the Trip-test mode, it willreturn automatically after approx. 5 minutes.

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Example 2: Trip-test function. Forced activation of the out-puts is made as follows:

a)Step forward on the display to register 0.

b)Press the RESET button for about 10 secondsuntil the three green digits to the right and theLED indicator of the uppermost setting knobstart flashing.

c)Press the push-buttons RESET and STEP si-multaneously. Then the starting of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3) is activated and, simultaneously, the indi-cator of the stage starts glowing yellow.

d)Press the RESET button for about 1 seconduntil the indicator of the second setting knobstarts flashing.

e)Press the push-buttons RESET and STEP si-multaneously to activate tripping of stage 1 (e.g.the I>-stage of the overcurrent module SPCJ3C3). The indicator of the concerned stagestarts glowing red.

f)Starting and tripping of the second stage isactivated in the same way as stage 1. The indica-tor of the third or fourth setting starts flashing toindicate that the concerned stage has been acti-vated.

g)To activate the self-supervision output step to-wards the test position, where no indicator isflashing. Press the STEP button once. In about5 seconds the red IRF indicator starts glowingand the IRF output is activated. Shortly thereaf-ter the indicator goes out and the output auto-matically resets. At the same time the moduleleaves the test position.

h)It is possible to leave the trip test mode at anystep of the sequence scheme by pressing theRESET button for about 10 seconds until thethree digits to the right stop flashing.

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Operationindicators

A measuring relay module is provided with twoseparate operating stages, each of which with itsown yellow/red operation indicator on the lowerpart of the front plate of the relay module.

The operation indicator starts glowing yellowwhen the operating stage starts and red when adelayed tripping operates. The functions of thestart and operation indicators are described indetail in the different protection relay modulemanuals.

Fault codes In addition to the protective functions the relaymodule is provided with a self-supervision sys-tem which continuously supervises the functionof the microprocessor, its program executionand the electronics.

When the self-supervision system has detected apermanent fault in the relay module, the redIRF indicator on the panel starts glowing soonafter the fault was discovered. At the same timethe module puts forward a signal to the self-supervision contact of the relay assembly.

In most fault situations a fault code, indicatingthe nature of the fault, appears on the display ofthe module. The fault code, which consists of ared digit (1) and a three digit green code number,cannot be removed from the display by reset-ting. When a fault occurs, the fault code shouldbe recorded and stated when service is ordered.

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ABB OySubstation AutomationP.O.Box 699FIN-65101 VAASAFinlandTel. +358 (0)10 22 11Fax.+358 (0)10 22 41094www.abb.com/substationautomation

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