r6551e_kcgg
DESCRIPTION
The range of overcurrent relaysprovides comprehensive protection forphase and earth faults, together withmeasurements, communications,control and recording facilities.Within the range, the KCGG relaysprovide non-directional overcurrentand earth fault protection, while theKCEG relays allow each stage ofprotection to be selectivelydirectionalised.TRANSCRIPT
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Types KCGG 122, 142and KCEG 112, 142, 152, 242Overcurrent Protection
Figure 1: Relay type KCEG 142Features
Compact multi-function numericalrelay
Versions with integraldirectionality (KCEG)
Serial communications
Comprehensive protectionfunctions including:
3 stage overcurrent
4 stage earth fault
restricted earth fault
9 IDMT curves including IEC,ANSI/IEEE
thermal overload alarm and trip
underfrequency
undercurrent
breaker failure
undervoltage
rectifier protection
broken conductor detection
Two setting groups
Extensive measurement facilities
Fault records for the last five faults
Integral disturbance recorderaccessible from a remote PC
Integral event recorder accessiblefrom a remote PC
Circuit breaker maintenance alarm
Phase segregated outputs2
Introduction
The range of overcurrent relaysprovides comprehensive protection forphase and earth faults, together withmeasurements, communications,control and recording facilities.
Within the range, the KCGG relaysprovide non-directional overcurrentand earth fault protection, while theKCEG relays allow each stage ofprotection to be selectivelydirectionalised.
The relays in the range are designedto operate with a wide range of ac ordc auxiliary power supplies. If asecure supply is not available, theKCEG242 model can be poweredfrom either an auxiliary supply (ac ordc) or from the CT circuit. Thus in theevent of auxiliary supply failure,tripping functions will remainoperational.Models Available
KCGG 122Single phase overcurrent and/or earthfault relay
KCGG 142Three phase overcurrent and earthfault relay
KCEG 112Directional earth fault relay
KCEG 142Three phase directional overcurrentand directional earth fault relay
KCEG 152Three phase overcurrent anddirectional earth fault relay (externalVo connection)
KCEG 242Self powered three phase directionalovercurrent and directional earth faultrelay
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Features per modelKCGG KCGG KCEG KCEG KCEG KCEG122 142 112 142 152 242
Selective directionalisation phase elements Selective directionalisation earth elements Rectifier protection curve Thermal protection Broken conductor detection Dedicated breaker fail protection Undervoltage Under frequency IEC/IEEE/ANSI curves Phased output contacts Cold load pick up CB maintenance Remote CB control Disturbance recorder Event recorder - last 50 records Fault recorder - last 5 full records Load shedding by level Single phase watts and vars Thermal ammeter Peak thermal demand
Multiple IDMT curves or definite time operationfor phase and earth fault low sets.
Two independent high set stages with definitetime operation for both phase and earth faultelements.
Undercurrent element for breaker fail and theauto-resetting of flags.
I>
I>>t>>
I>>> t>>>I
Ith
TC
Current
Time
Figure 2: Overcurrent characteristicTable 1: Relay models available
Application
The KCGG and KCEG overcurrentrelays can be used in all applicationswhere overcurrent protection isrequired, eg. radial and ring circuits,and single and parallel feeders.Furthermore, the integral startingelements can be used to provide non-cascade operation and busbarprotection, with additional directionalzone feeder protection available inthe KCEG.
Thermal and restricted earth faultprotection is also provided for linesand transformers. When used with therectifier IDMT curve, this can providefull protection of silicon rectifiers.
The low settings of KCGG/KCEGrelays are suitable for the protectionof high impedance earthed systems.[For arc suppression earthed systems(Petersen Coil) see publication R6537.]
Undervoltage and underfrequencyprotection will operate for changes insystem conditions or can be used toprovide other protection and controlfunctions.Functions
Phase fault protection
Figure 2 shows the characteristics ofthe three phase overcurrent elements(I>, I>> and I>>>), their respectivetime delays (t>, t>> and t>>>) and theundercurrent element (I/t>) in therelay has a choice of nine inverse andone definite time characteristic asshown in Figure 12.This element has a reset timer to assistfaster clearance of intermittentrecurrent faults. There are two otherelements [(I>>/t>>) and (I>>>/t>>>)]for each phase function, which can beselectively disabled if not required.
Thermal overload protection
The thermal overload element is a trueI2 characteristic, with adjustablealarm and trip thresholds. The thermalstate is stored in non-volatile memory.
Earth fault protection
The earth fault elements aredesignated (Io>/to>), (Io>>/to>>)and (Io>>>/to>>>), and theirrespective time delays are (to>, to>>,to>>>).
Directional elements (KCEG)
Directional fault elements arepolarised by the quadrature phase-phase voltage. The phase directionalelements are provided withsynchronous polarization which ismaintained after the voltage collapsesso that decisive operation is ensured.
For KCEG 142/242 relays, thepolarizing voltage (-3Vo) is internallyderived from the three phase-neutralvoltages applied to the relay. In thecase of the KCEG 112/152, thepolarizing voltage must be externallyderived from an open delta windingon the line voltage transformers or viaa voltage transformer in the earthpath. The earth fault elements areprovided with the same range of timeand current settings.
Undercurrent elements and threephase loss of load
Two undercurrent elements areprovided, one for phase faults (I
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Circuit breaker failure and back-trip
This protection feature allows the relayto trip the upstream circuit breakerwhen a local breaker failure conditionis detected and can be energised bothfrom operation of the relay or anexternal trip. Figure 3 shows a typicalback-trip method for a fault on Feeder1 that should be cleared by Relay 2and circuit breaker B (CB-B). If CB-Bfails to clear the fault, it will becleared by the back-trip contact ofRelay 2 tripping CB-A.
Undervoltage protection (KCEG)
A separate characteristic can be set toprovide an output for undervoltageswhich are phase-phase, phase-neutral,three phase or single phase.An independently set timer, tV< isused with this function which canallow a voltage controlled overcurrentfeature to be created by switchingbetween different current settings inthe two groups. The undervoltageelement can be blocked when thecircuit breaker is open.
Underfrequency
A delayed underfrequency element isavailable which can be used toinitiate direct load shed tripping.
Busbar protection
Protection of busbars can also beachieved by using the start andblocking contacts of the K relays.If in Figure 3, relay 1 has a standardIDMT characteristic for I>, but a fastacting I>> element (time delay oftypically 50ms) which is blocked bythe downstream relays for feeder4
Figure 3: Back trip fault clearance
Feeder 1 Feeder 2
Relay 2 Relay 3
C
CB-B CB-C
Incomerfaults, an economical form of busbarprotection can be applied to a system.This can be used where dedicatedbusbar protection can not be justified.
Rectifier protection
A special inverse time curve providesprotection for silicon rectifiers. Whereused with the thermal overload,instantaneous short circuit andrestricted earth fault protection, boththe transformer and rectifier can befully protected.
Broken conductor detection
The relay can provide a brokenconductor alarm when it detects loadcurrent in only two out of threeconductors.
Circuit breaker maintenance data
An alarm is provided to indicate theneed for circuit breaker maintenancebased upon the number of circuitbreaker operations or upon thesummated contact breaking duty.The circuit breaker trip time is storedin the fault records.Feeder 3
Relay 1
Relay 4
B-A
CB-D
Back tripConfiguration
Logic
The configuration of the relay, to meetthe required applications, isaccomplished in software. Settinglogic function links, together with theassignment of inputs and outputs,define the way that the relay willoperate. This allows:
Selection of features Implementation of user defined
logic using auxiliary timers Control of the integral disturbance
and event recorder
These may be defined by the user viathe relay front panel function keys, orremotely by a PC via thecommunications system.
Alternative setting group
Two setting groups allow the user toassign settings for different operatingconditions. Several methods ofselecting the alternative setting groupare provided.Ancillary Functions
Measurements
The measurement values provided bythe relay can be accessed by anintegral back-lit liquid crystal displayor via the serial port eliminating theneed for additional instrumentation tobe mounted on the panel. Themeasurements can be displayed ineither primary or secondary values asselected by the user.
The following quantities are providedas standard: phase current neutral current frequency thermal ammeter peak demand ammeter
Additional values are provided by theKCEG, as follows: phase voltage line voltage zero sequence voltage watts (single phase and three
phase) VArs (single phase and three
phase) volt amps power factor
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Fault records
The last five faults are recorded by therelay. They include: fault flags currents voltages (where measured) circuit breaker operation time
Event records
Fifty events are stored in a buffer.Software is available to enable theevents to be downloaded to a PC.An event record is logged following achange of state of a control input oroutput relay, local setting change, oroperation of a control function.Records are time tagged to aresolution of 1ms. Fault records andalarms are also stored as events.
Disturbance records
The internal disturbance recorder hasup to 7 analogue, 16 digital and 1time channel (depending on the modelselected). The recorder can betriggered from any relay output and/or digital input, and can store onecomplete record. Data is sampled 8times per cycle and each channel canstore up to 512 samples. Software isavailable to allow records to beaccessed and displayed by a PC.
Test Features
A number of features are provided toenable the relay to be thoroughlytested during commissioning, routinemaintenance and fault findingoperations: Power-on diagnostics Continuous self monitoring The verification of input quantities
by the measurement functions The on/off states of the digital
inputs and relay outputs can bedisplayedHardware Description
KCGG and KCEG relays are housedin Midos modular cases, suitable foreither rack or panel mounting asshown in Figures 13, 14 and 15.
The relays can have up to 4 CT andup to 3 VT analogue inputs. Theyprovide 3 or 8 optically isolatedinputs and 4 or 8 programmableoutputs depending on the modelselected, together with a dedicatedwatchdog relay.
The front panel contains a 2 x 16character alphanumeric back-lit liquidcrystal display (LCD). The back-light isactivated when the keypad is touchedand will automatically switch off,conserving power, after 15 minutes ofkeypad inactivity. Four push-buttonsprovide local access to the relaysmenu. There are also 3 light emittingdiodes (LED) for visual indication ofthe relays status, ie. relay healthy,trip, alarm.
Standard Midos terminal blocks arelocated at the rear of the relayproviding connections for all inputand output circuits. Each terminal willaccept up to two connections usingeither; an L shaped ring connectorfastened with a 4mm diameter (M4)screw or; a snap-on connectorcompliant with BS5057 or equivalent.User Interface
Front panel user interface
The features of the relay can beaccessed through a menu drivensystem. The menu is arranged in theform of a table, into each column ofwhich, related items (menu cells) aregrouped.
The front panel LCD displays onemenu cell at a time. The completemenu system can be traversed withthe relays front cover in place byusing the F key. Easier access canbe made with the cover off by usingthe + and - keys, which are alsoused to change the relay settings.
Remote access user interface
The menu table can also be accessedvia the remote communicationsfacility. This allows all of the menucells in a column to be displayedsimultaneously on the screen of a PC.Changes to a menu cell can be madefrom the PC keyboard.
Serial communication
The relays are interconnected via ashielded, twisted wire pair known asK-Bus. Up to 32 relays may beconnected in parallel across the bus.
The K-Bus is connected through aprotocol converter known as KITZ,either directly or via a modem, to theRS232 port of the PC. The KITZprovides signals over the bus whichare RS485 based and are transmittedat 64kbits/s. The K-Bus connection isshown in Figure 5.
This system allows up to 32 relays tobe accessed through one RS232communications port. A pictorialrepresentation of this is shown inFigure 4.
Software is available with each KITZto provide access to the relay to readand change settings. Additionalsoftware entitled Protection AccessSoftware & Toolkit is available. Thisprovides access to the event recorderand other additional functions.
Each relay is directly addressableover the bus to allow communicationwith any selected relay. Globalcommands may also be given to allrelays on the network.5
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Figure 4: Basic communication system
KITZ
Protocolconverter
RS232K-Bus
Relay 32 Relay 3 Relay 2 Relay 1
DesktopcomputerPC
Relay 4It should be noted that protectiontripping and blocking signals are notrouted via the K-Bus. Separateconventional cabling is used for thispurpose; where appropriate theisolated 48V dc supply available oneach relay is used to energise theoptically-isolated inputs.
Communications protocol
The communications protocol usedwith K Range relays is designatedCourier. The Courier language hasbeen developed specifically for thepurpose of developing generic PCprograms that will, withoutmodification, communicate with anydevice using the Courier language.
In the Courier system, all informationresides within the relay. Each timecommunication is established with therelay, the requested information isloaded to the PC. The protocolincludes extensive error checkingroutines to ensure the system remainsreliable and secure.
Password protection
Password protection is provided onsettings which alter the configurationof the relay, any accidental change towhich could seriously affect the abilityof the relay to perform its intendedfunction, ie. enable/disable settings,protection function characteristicselection, scheme logic settings andsystem VT and CT ratios.6
Figure 5: Typical communications terminal arrangement
K bus screened2 core cable
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7
Figu
re 6
: Ty
pica
l app
licat
ion
diag
ram
KC
GG
122
13 14 21 22 23 24 25 26 27 28 46Us
er d
efin
able
inpu
t L0
48Us
er d
efin
able
inpu
t L1
50Us
er d
efin
able
inpu
t L2
52(1
)Lo
gic
inpu
t com
mon
AP1
P2
S2S1
B C
4 6W
DRe
lay
heal
thy
3 5W
DRe
lay
faile
d
30 32RL
0
34 36RL
1
38 40RL
2
42 44RL
3
54
KBu
s com
muni
catio
ns p
ort
56 7 8+4
8V fi
eld vo
ltage
AC/D
Csu
pply Vx
KCG
G 1
22
Not
es: (a)
CT sh
ortin
g lin
ks m
ake
befo
re (b
) and
(c) d
iscon
nect.
(b)
Shor
t ter
mina
ls br
eak b
efor
e (c)
.(c)
Long
term
inal
(d)
Pin te
rmin
al (p
cb ty
pe).
(1)
CT c
onne
ction
s are
typi
cal o
nly.
(2)
Earth
con
necti
ons a
re ty
pica
l only
.(3
)
C
A
BPh
ase
rota
tion
3 54 6
1 7 98 10
31 3332 34
29 35 3736 3830
3940
4142
4344
4546
4748
4950
5152
5354
5556
1314
1718
1920
2122
2324
2526
2728
SCN
Mod
ule te
rmin
al b
lock
svie
wed
from
rear
(with
integ
ral c
ase
earth
link
)
Case
ear
th
1
Case
ear
thco
nnec
tion
User
def
inab
le ou
tput
User
def
inab
le ou
tput
User
def
inab
le ou
tput
User
def
inab
le ou
tput
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8
Figure 7: Typical application diagram KCGG 142
13
14
21
2223
2425
2627
28
46
48
50
52Logic input common (1)
AP1P2
S2 S1B
C
4
6WD Relay healthy
3
5WD Relay failed
30
32RL0
34
36RL1
38
40RL2
42
44RL3
7
8+48V field voltage
AC/DCsupply
Vx
KCGG 14229
31RL4
33
35RL5
37
39RL6
41
43RL7
45User definable input L3
47User definable input L4
49User definable input L5
51User definable input L6
53User definable input L7
55(2)Logic input common
Notes:
(a) CT shorting links makebefore (b) and (c) disconnect.
(b) Short terminals break before (c).(c) Long terminal
(d) Pin terminal (pcb type).
(1)
CT connections are typical only.(2)Earth connections are typical only.(3)
C
A
BPhase rotation
1
Case earthconnection
54
KBus communications port56
35
46
1
79
810
3133
3234
29
3537
3638
30
39 4041 4243 4445 4647 4849 5051 5253 5455 56
13 14
17 1819 2021 22
23 24
25 26
27 28SCN
Module terminal blocksviewed from rear
(with integral case earth link)
Case earth
User definable input L0
User definable input L1
User definable input L2
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
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9 Figure 8: Typical application diagram KCEG 112
13
14
21
2223
2425
2627
28
46
48
50
52(1)Logic input common
AP1P2
S2 S1B
C
4
6WD Relay healthy
3
5WD Relay failed
30
32RL0
34
36RL1
38
40RL2
42
44RL3
54
KBus communications port56
7
8+48V field voltage
Notes:(a) CT shorting links make
before (b) and (c) disconnect.(b) Short terminals break before (c).(c) Long terminal(d) Pin terminal (pcb type).
(1)
CT connections are typical only.(2)Earth connections are typical only.(3)
AC/DCsupply
Vx
KCEG 112
C
N
BA
dn
da
19
20
Direction of forward current flow
C
A
BPhase rotation
35
46
1
79
810
3133
3234
29
3537
3638
30
39 4041 4243 4445 4647 4849 5051 5253 5455 56
13 14
17 1819 2021 22
23 24
25 26
27 28SCN
Module terminal blocksviewed from rear
(with integral case earth link)
Case earth
1
Case earthconnection
User definable input L0
User definable input L1
User definable input L2
User definable output
User definable output
User definable output
User definable output
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10
Figure 9: Typical application diagram KCEG 142
13
14
21
2223
2425
2627
28
46
48
50
52
AP1P2
S2 S1B
C
4
6WD Relay healthy
3
5WD Relay failed
30
32RL0
34
36RL1
38
40RL2
42
44RL3
54
KBus communications port56
7
8+48V field voltage
AC/DCsupply
Vx
KCEG 142
29
31RL4
33
35RL5
37
39RL6
41
43RL7
45
47
49
51
53
55(2)Logic input common
Notes:(a) CT shorting links make
before (b) and (c) disconnect.(b) Short terminals break before (c).(c) Long terminal(d) Pin terminal (pcb type).
(1)
CT connections are typical only.(2)Earth connections are typical only.(3)
C
N
BA
n
a
Direction of forward current flow
b c
17
18
19
20
C
A
BPhase rotation
35
46
1
79
810
3133
3234
29
3537
3638
30
39 4041 4243 4445 4647 4849 5051 5253 5455 56
13 14
17 1819 2021 22
23 24
25 26
27 28SCN
Module terminal blocksviewed from rear
(with integral case earth link)
Case earth
1
Case earthconnection
Logic input common (1)
User definable input L3
User definable input L4
User definable input L5
User definable input L6
User definable input L7
User definable input L0
User definable input L1
User definable input L2
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
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11 Figure 10: Typical application diagram KCEG 152
KBus communications port
13
14
21
2223
2425
2627
28
46
48
50
52
AP1P2
S2 S1B
C
4
6WD Relay healthy
3
5WD Relay failed
30
32RL0
34
36RL1
38
40RL2
42
44RL3
54
56
7
8+48V field voltage
AC/DCsupply
Vx
KCEG 152
29
31RL4
33
35RL5
37
39RL6
41
43RL7
45
47
49
51
53
55(2)Logic input common
C
N
BA
dn
da
Direction of forward current flow
19
20
Notes:(a) CT shorting links make
before (b) and (c) disconnect.(b) Short terminals break before (c).(c) Long terminal(d) Pin terminal (pcb type).
(1)
CT connections are typical only.(2)Earth connections are typical only.(3)
C
A
BPhase rotation
35
46
1
79
810
3133
3234
29
3537
3638
30
39 4041 4243 4445 4647 4849 5051 5253 5455 56
13 14
17 1819 2021 22
23 24
25 26
27 28SCN
Module terminal blocksviewed from rear
(with integral case earth link)
Case earth
1
Case earthconnection
Logic input common (1)
User definable input L3
User definable input L4
User definable input L5
User definable input L6
User definable input L7
User definable input L0
User definable input L1
User definable input L2
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
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12
Figure 11: Typical application diagram KCEG 242
13
14
21
2223
2425
2627
28
4648
50
52
AP1P2
S2 S1B
C
4
6WD Relay failed
3
5WD Relay healthy
30
32RL0
34
36RL1
38
40RL2
42
44RL3
54
KBus communications port56
7
8+48V field voltage
AC/DC supply Vx
KCEG 242
29
31RL4
33
35RL5
37
39RL6
41
43RL7
45
47
49
51
53
55(2)Logic input common
910
Supply to trip coil
SeriesREG
C
N
BA
n
a
Direction of forward current flow
Notes:(a) CT shorting links make
before (b) and (c) disconnect.(b) Short terminals break before (c).(c) Long terminal(d) Pin terminal (pcb type).
(1)
CT connections are typical only.(2)Earth connections are typical only.(3)
17
18
19
20
b c
C
A
BPhase rotation
35
46
1
79
810
3133
3234
29
3537
3638
30
39 4041 4243 4445 4647 4849 5051 5253 5455 56
13 14
17 1819 2021 22
23 24
25 26
27 28SCN
Module terminal blocksviewed from rear
(with integral case earth link)
Case earth
1
Case earthconnection
Logic input common (1)
User definable input L3
User definable input L4
User definable input L5
User definable input L6
User definable input L7
User definable input L0
User definable input L1
User definable input L2
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
User definable output
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13 Figure 12: IDMT curves.
STI 30xDTVI 30xDT
EI 10xDT
SI 30xDT
LTI 30xDT
1 10 100
Multiples of setting
10000
1000
100
10
1
0.1
Ope
ratin
g tim
e (se
cond
s)
Rectifiercurve
10000
1000
100
10
1
0.11 10 100
EI
VI
MI
Multiples of setting
Ope
ratin
g tim
e (se
cond
s)
1
Current (xlth>)
0.001
No pre-fault load
Time
(x t)
Pre-fault load at50% thermal state
2 3 4 5 6
0.010
0.100
1.000
10.000
Pre-fault load at70% thermal state
Pre-fault load at90% thermal state
Figure 13: Thermal curves
IEC and special application curves ANSI/IEEE curves
LTI 30xDT Long time inverse MI Moderately inverseSI 30xDT* Standard inverse VI Very inverseEI 10xDT* Extremely inverse EI Extremely inverseVI 30xDT* Very inverseSTI 30xDT Shot time inverse*IEC standard characteristic All characteristics are definite time above 30x except extremely inverse.
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14Technical Data
Ratings
Inputs:
AC current (In) 1A or 5A
AC voltage (Vn) 110V or 440V nominal phase-phase
Frequency 50/60Hz
Auxiliary voltage (Vx) KCGG 122,142 and KCEG 112,142,152
Nominal (V) Operative range (V)
dc dc ac
24/125 19/150 50/153or
48/250 33/300 87/265
KCEG242 only
100/250 60/300 60/265
Outputs:Field voltage supply(for optically-isolated digital inputs) 48V dc (current limit: 60mA)
Capacitor discharge trip 50V dc, 680F
Burdens
AC current 0.02VA at In = 1A0.03VA at In = 5A
AC voltage 0.02VA at 110V phase-phase
DC auxiliary voltage 4W to 12W*
AC auxiliary voltage 6VA to 23VA*
Optically-isolated inputs 0.25W per input
*Note: Depending on the number of inputs and outputs energised.
Thermal withstand
AC current inputs 3.2In continuous30In for 3s
AC voltage inputs 2 x Vn continuously2.6Vn for 10swhere Vn = 110V phase-phase
Accuracy
Operating times
t>/to> Typically 5% plus 20 40ms
t>>/to>>/t>>>/to>>> Typically 0.5% plus 10 45ms
Reset time
t>/to> Typically 1% 50ms
Measurements
Voltage Typically 2% Vn
Current Typically 2% In
Power Typically 4% Pn
Frequency Typically 0.02Hz
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Transformer turns ratios
Current transformers 1:1 to 9999:1
Voltage transformers 1:1 to 9999:1
Current transformer requirements
The following CT requirements are based on a maximum prospective faultcurrent of 50In and the relay having a maximum high setting of 25In. The CTrequirements are designed to provide operation of the phase and earth faultelements. When the criteria for a specific application are in excess of thosedetailed above or the actual resistance exceeds the limiting value quoted, the CTrequirements may need to be increased. CT requirements for a variety of furtherapplications are provided in publication R6096. Where the relays are beingused for restricted earth fault protection the CTs must be of the correct size toassure stability as described in publication R4120.
KCGG 122,142 and KCEG 112,142,152
Relay and CT Nominal output Accuracy limit Limiting leadsecondary Accuracy class factor x rated resistancerating (A) (VA) current one way
1 2.5 10P 20 0.6
5 7.5 10P 20 0.06
KCEG242
1 7.5 10P 15 0.7
5 10 10P 20 0.06
Overcurrent settings
Phase fault
Threshold (Is)
KCGG 122,142 KCEG 242KCEG 112,142,152
I> 0.08 3.2In 0.4 2.4In
I>> 0.08 32In 0.4 32In
I>>> 0.08 32In 0.4 32In
I< 0.02 3.2In 0.02 3.2In
Earth fault
All models
Standard Special (provided on request)
Io> 0.005 0.8In 0.02 3.2*
Io>> 0.005 8.0In 0.02 32In*
Io>>> 0.005 8.0In 0.02 32In*
Io< 0.005 0.8In 0.02 3.2In
*Notes: 1. For operation for earth faults below 0.2In with the KCEG 242,there must be sufficient load current to power the relay oralternatively, an auxiliary voltage supply.
2. The special settings may be required where limitations on the CTratio result in a need for an unusually high earth fault setting.Otherwise the standard setting range should be chosen.
Thermal Alarm 0 110% of thermal state
Ith> 0.08 3.2In
tc 1 to 120 minutes15
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16Directional settings (KCEG)
Characteristic angle 180 to +180 in 1 steps
Zone of operation Characteristic angle 90
Voltage polarising threshold 110Vn: 0.6V fixed(overcurrent directional elements) 440Vn: 2.4V fixed
Voltage polarising threshold Vop> 110Vn: 0.6V to 80V in 0.2V steps(earth fault directional elements) 440Vn: 2.4V to 320V in 0.8V steps
Undervoltage trip threshold V< 110Vn: 1.0V to 220V in 1.0V steps440Vn: 4.0V to 880V in 4.0V steps
Undervoltage V< Vn = 110V: 0 to 220VVn = 440V: 0 to 880V
Underfrequency F< 46 to 64Hz in 0.01Hz stepsReset F< +0.05Hz
Time settings (in graded steps)
to>/t> (definite time) 0 to 100s
tRESET 0 to 60s
to>>/t>> 0 to 100s
to>>>/t>>> 0 to 100s
tV< 0 to 10s
tAUX 1 0 to 2 x 106s (24 days)
tAUX 2 0 to 2 x 106s (24 days)
tAUX 3 0 to 2 x 106s (24 days)
tBF 0 to 10s
tTRIP/tCLOSE 0.5s to 5s
IDMT curves See Figure 12.
Digital inputs
Optically-isolated inputs 3 (KCGG 122/KCEG 112)8 (All other models)
Maximum operating voltage >35V dc
Maximum input resistance 50V dc
AC immunity 50V
Contacts
Output relays 4 (KCGG 122/KCEG 112)8 (All other models)
Contact rating Make: 30A and carry for 0.2s
Carry: 5A continuous
Break: dc 50W resistive25W inductive(L/R = 0.04s)
ac 1250VA
Subject to maxima of 5A and 300V.
Watchdog relays 1 make and 1 break
Make: 10A and carry for 0.2s
Carry: 5A continuous
Break: dc 30W resistive15W inductive(L/R = 0.04s)
ac 1250VA
Subject to maxima of 5A and 300V.
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Durability
Loaded contact 10,000 operations minimum
Unloaded contact 100,000 operation minimum
Communications port (K-Bus)
Transmission mode SynchronousSignal levels RS485Message format HDLCData rate 64 kbits/s
Connection Multidrop (32 units)Cable type Screened twisted pairCable length 1000mConnector Screw terminals
Isolation 2kV rms for 1 minute
High voltage withstand
Dielectric withstandIEC 255-5: 1977 2kV rms for 1 minute between all case
terminals (except terminals 1)connected together and thecase earth/terminals 1.
2kV rms for 1 minute between allterminals of independent circuits withterminals on each independent circuitconnected together.
1.5kV rms for 1 minute across opencontacts of output relays.
1kV rms for 1 minute across the opencontacts of the watchdog relays.
High voltage impulseIEC 255-5: 1977 Three positive and three negative
impulses of 5kV peak, 1.2/50s,0.5J between all terminals and allterminals (except terminals 1) andcase earth/terminal 1.
Electrical Environment
DC supply interruptionIEC 255-11: 1979 10ms interruption in the auxiliary
supply.
AC ripple on dc supplyIEC 255-11: 1979 12% ac ripple on the dc supply.
High frequency disturbanceIEC 255-22-1: 1988 Class III 2.5kV peak between independent
circuits and case.
1.0kV peak across terminals of thesame circuit.
Fast transient disturbanceIEC 255-22-4: 1992 Class IV 4kV, 5kHz applied directly to all
inputs.
4kV, 2.5kHz applied directly toauxiliary voltage, watchdog and tripcapacitor.
4kV, 2.5kHz via capacitor clamp toall inputs.17
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18Electrostatic dischargeIEC 255-22-2: 1996 Class 3 8kV discharge in air with cover in
place.
4kV point contact discharge withcover removed.
EMC Compliance89/336/EEC Compliance to the European
Commission Directive on EMC isclaimed via the Technical ConstructionFile route.
EN 50081-2: 1994 Generic Standards were used toEN 50082-2: 1995 establish conformity.
Product safety73/23/EEC Compliance with European
Commission Low Voltage Directive.
EN 61010-1: 1993/A2: 1995 Compliance is demonstrated byEN 60950: 1992/A3: 1995 reference to generic safety standards.
Atmospheric environment
TemperatureIEC 68-2-1: 1990 (cold) Storage and transit 25C to +70C
IEC 68-2-2: 1974 (dry heat) Operating 25C to +55C
HumidityIEC 68-2-3: 1969 56 days at 93% RH and +40C
Enclosure ProtectionIEC 529: 1989 IP50 (dust protected)
Mechanical environment
VibrationIEC255-21-1: 1988 Response Class 1
Endurance Class 1
Shock and bumpIEC255-21-2: 1988 Shock response Class 1
Shock withstand Class 1
Bump Class 1
SeismicIEC255-21-3: 1993 Class 1
IEEE/ANSI testsC37.90.2 - 1989 Standard for relay systems associated
with electrical power apparatus.
C39.90.1 - 1989 Surge withstand capability (SWC)
C37.90.2 - 1987 Radio electromagnetic interference(with amended field strength of35V/m)
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149
177
Push buttonprojection 10 max.
32 21225 min.
157 max.
155
151
103.6
23.54 holes 4.4
168 159
Panel cut-out:Flush mounting fixing details.
All dimensions in mm.
Flush mounting. 11
Cases
KCGG122KCGG142 Midos size 4KCEG112
KCEG142KCEG152 Midos size 6
KCEG242 Midos size 8
Case outlines are shown in Figures 14, 15 and 16.Figure 14: Case outlines size 4
97
177
Push buttonprojection 10 max.
32 21225 min.
157 max.
11103
99
52
23.54 holes 4.4
168 159
Panel cut-out:Flush mounting fixing details.
All dimensions in mm.
Flush mounting.
Figure 15: Case outlines size 6
Figure 16: Case outlines size 8
200
177
Push buttonprojection 10 max.
32 21225 min.
157 max.
11206
203
155.4
244 holes 4.4
168 159
Panel cut-out:Flush mounting fixing details.
All dimensions in mm.Flush mounting.Additional information
Service Manual R8551
Courier Communications R4113
CT Requirements for the Application of Midos Relays R6096
K Range Relay Schemes R6536
KCEU141/241 R6537
KITZ101/102/103 R6521
KITZ201 R6542
Restricted Earth Fault Protection using K Range Overcurrent Relays R412019
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20Information required with order
Relay type: K C G G 0 1 D 0
122 1 2 2142 1 4 2
Configuration:Standard 0 1
Case size:Size 4 MIDOS Flush Mounting D
Auxiliary voltage:24/125V 248/250V 5
Not used
CT Rating:1A CT (0.005In to 0.8In for earth faults) standard C1A CT (0.02In to 3.2In for earth faults) special D5A CT (0.005In to 0.8In for earth faults) standard E5A CT (0.02In to 3.2In for earth faults) special F
Language:English EFrench FGerman GSpanish S
* Note: See Overcurrent settings, page 15.It will be assumed that the standard version will be required unlessotherwise stated in the order.
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Relay type: K C E G 0 1
112 1 1 2142 1 4 2152 1 5 2242 2 4 2
Configuration:Standard 0 1
Case size:Size 4 MIDOS Flush Mounting (KCEG112 only) DSize 6 MIDOS Flush Mounting (KCEG142/152 only) FSize 8 MIDOS Flush Mounting (KCEG242 only) H
Auxiliary voltage:24/125V (except KCEG242) 248/250V (except KCEG242) 5110/250V (KCEG242 only) 9
Operating Voltage:110 Vac; 50 - 60Hz 1440 Vac; 50 - 60Hz 4
CT Rating:1A CT (0.005In to 0.8In for earth faults) standard C1A CT (0.02In to 3.2In for earth faults) special D5A CT (0.005In to 0.8In for earth faults) standard E5A CT (0.02In to 3.2In for earth faults) special F
Language:English EFrench FGerman GSpanish S
* Note: See Overcurrent settings, page 15.It will be assumed that the standard version will be required unlessotherwise stated in the order.21
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22Glossary
Courier A communications language developed to provide genericcontrol, monitoring, data extraction and setting changes onremote devices (primarily on protective relays) within thesubstation environment.
K-Bus The 64 kbit/s twisted pair cable used to connect Couriercompatible devices and transfer Courier data.
KITZ The interface unit which converts between K-Bus and IEC870format data.
PC Personal computer
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23
FeaturesIntroductionModels AvailableApplicationFunctionsConfigurationAncillary FunctionsHardware DescriptionUser InterfaceTechnical DataRatingsBurdensThermal withstandAccuracyTransformer turns ratiosCurrent transformer requirementsOvercurrent settingsDirectional settings (KCEG)Time settingsDigital inputsContactsHigh voltage withstandElectrical EnvironmentAtmospheric environmentMechanical environment
CasesAdditional informationInformation required with orderGlossary