R6551e_KCGG

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

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

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

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

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

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

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





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 output








9 Figure 8: Typical application diagram KCEG 112

13

14

21

2223

2425

2627

28

46

48

50


AP1P2

S2 S1B

C

4

6WD Relay healthy

3

5WD Relay failed

30

32RL0

34

36RL1

38

40RL2

42

44RL3

54


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)


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



Case earth

1









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


7

8+48V field voltage

AC/DCsupply

Vx

KCEG 142

29

31RL4

33

35RL5

37

39RL6

41

43RL7

45

47

49

51

53




(1)


C

N

BA

n

a


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



Case earth

1


Logic input common (1)

















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


C

N

BA

dn

da


19

20



(1)


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



Case earth

1



















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


7

8+48V field voltage

AC/DC supply Vx

KCEG 242

29

31RL4

33

35RL5

37

39RL6

41

43RL7

45

47

49

51

53


910

Supply to trip coil

SeriesREG

C

N

BA

n

a




(1)


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



Case earth

1



















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



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.

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

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

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)



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.

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

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)

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


32 21225 min.

157 max.

11103

99

52

23.54 holes 4.4

168 159


All dimensions in mm.

Flush mounting.

Figure 15: Case outlines size 6

Figure 16: Case outlines size 8

200

177


32 21225 min.

157 max.

11206

203

155.4

244 holes 4.4

168 159


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

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.

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

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

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

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