Check List Pre of Comm Relays

8/20/2019 Check List Pre of Comm Relays

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Annexure - VI

Line Protection:

Main-I/II Protection Panel :

1. Main-I /II Distance relay: (separate for Main-I & II Relays

(i) Check for proper programming of Input / Output contacts of the OK Not OK relay as per approved schematics

(ii) a) Check for proper programming of LE!s(if applica"le) of the OK Not OK relay and check that stickers are provided as per the configuration#

") Check Configuration / $rogramma"le %cheme Logic of

relay according to scheme OK Not OK (applica"le for numerical relays)

c) &et the print out of Configuration / $%L OK Not OK

(iii) &et a print of relay settings' OK Not OK

(iv) Compare ith the recommended setting# OK Not OK (v) Check for each %etting ' *one+ I, II, III,I- OK Not OK

(vi) Check time of operation ' *one+ I, II, III,I- OK Not OK (vii) .est results of (iii) (iv) enclosed 0E% NO

(viii) Check polarity of send receive for $LCC commands OK Not OK

( If igital Channel/ 1nder 2E. operation)#(ix) Check $ermissive tripping "y Carrier command receive OK Not OK

3lso check Carrier %end command on relay tripping#

-erify respective counter advancement in each channel# %EN EC

43IN+I C56 COE66 C56 COE66 OK Not OK

C56 COE6## C56 COE66 OK Not OK 43IN+II C56 COE C56 COE66 OK Not OK

C56 COE C56 COE66 OK Not OK

(x) Check %O.2 Logic# Check Control sitch( .C%) OK Not OK

irings on Control panel to elay Input for %O.2( if provided)#

(xi) Check %elective $hase tripping( $h fault to +$h .rip etc)2or each phase separately# OK Not OK

(xii) Check $oer sing feature(if availa"le)# OK Not OK

(xiii) Check trip 7lock in case of C-. 2use 2ailure# OK Not OK

(xiv) Check 3uto eclose Initiation Contacts for

(a) .ransient %ingle $hase Earth fault(*one+8*one+9:C) OK Not OK (") Non initiation for 8 phase fault in *one II OK Not OK

(c) .ransient $h+$h 2ault OK Not OK

(d) .ransient ; $hase 2aults OK Not OK (e) $ermanent 2aults($repare ;$h .rip) OK Not OK

(f) Check for dead time and reclaim time setting OK Not OK

(g) Check single phase auto reclosure for all three



Annexure - VI

phases one "y one# OK Not OK (xv) Check for tripping command directly to C7 correct

operation of tripping relays and au<iliary relays OK Not OK

(xvi) Check Communication to $C keeping ad=acent relay

INO1. of service (If availa"le) OK Not OK

(xvii) Check $LCC carrier %itch Operation( In/Out)# OK Not OK

(xviii) Check .ime synchroni>ing "y altering .ime *one# OK Not OK estore on confirmation#

(xix) Check %elf+diagnostic feature of the relay (if provided) OK Not OK

(xx) Check metering function of the relay (if provided) OK Not OK (xxi) -erify automatic donloading feature as per .ech spec# OK Not

(xxii) -erify availa"ility of configuration tool at site#

(xxiii) -erify 4ain .ie C. circuits "y primary in=ection# OK Not OK (xxiv) Check directionality of the relay after synchroni>ation OK Not OK

of the line#

(xxv) Check for E2 protection and its contacts (if applica"le) OK Not OK (<<viii) Check all the contacts of relay for proper operation rating OK Not OK

!. "#er#olta$e %ta$e-I/II

(i) Check Operate -alue/eset -alue/Operate OK Not OK

.iming for all phases#

(ii) Check hether it trips 4ain/.ie C7 0E% Nosends irect trip to remote end#

. %tu' protection ( )* sc+e,e(i) Check scheme logic OK Not OK

(ii) Check operation at set value OK Not OK

(iii) Check irect .rip send receive circuit

ith carrier command# -erify counter advancement in each channel# OK Not OK

. * Differential-I/II:

(i) Check Operate -alue/eset -alue/Operate .iming for all phases# OK Not OK

(ii) Check tripping of 4ain/.ie C7 send irect trip to remote end# OK Not OK

(iii) Check sta"ility for out >one fault# OK Not OK

If iase ifferential.

Check 7iasing percentage for all phases# OK Not OK

0. ault Locator:2eed 2L istance relay ith same -oltage Current from test Kit#%imulate *one+I/II ,%ingle $h/$h+$h/;$h 2ault to 4ain+I/II istance relay#

(i) Check initiation "y istance relay# OK Not OK

(ii) Compare 2ault location "y calculating the %et -ale on test Kit# OK Not OK

(iii) epeat the a"ove up to ??@ in steps# OK Not OK



Annexure - VI

(iv) Check healthiness of mutual compensation circuit# OK Not OK

2. Distur'ance Recorer:(i Check analog digital channels are connected as per approved

nomenclature# OK Not OK

(ii Check threshold value of analog triggering(including

open delta voltage)# OK Not OK

(iii Check triggering on digital inputs# OK Not OK

(i# Check automatic donloading feature OK Not OK

(# Check time synchroni>ing feature OK Not OK

(#i -erify open delta voltage in channel OK Not OK

(#ii Check diagnostic feature(if provided) OK Not OK



Annexure - VI

)ircuit-rea3er Panel1. Auto-reclose %c+e,e' (Checks applica"le for distance protection scheme ith auto reclosurefunction as ell)

(i) Check auto recluse initiation/7lock contacts for 'a# .ransient single phase earth fault

"# Non+initiation for 8+phase fault in *one+II OK Not OK

c# .ransient phase A phase earth fault OK Not OK

d# .ransient ;+phase fault OK Not OK

e# $ermanent faults# OK Not OK

(ii) %imulate *one+I ,%ingle $h .ransient E/2 to 4ain+I/II istance OK Not OK

relay Check 3 for all ; $hases,one "y One#

(iii) Loop C% C %imulate *one+II ,%ingle $h .ransient E/2 to OK Not OK

4ain+I/II istance relay Check 3 for all ; $hases, one "y One#

(iv) Check settings operation of %ynchroni>ing/LC relays OK Not OK (v) 4easure ead .ime setting # 666m%

(vi) 4easure eclaim .imer setting#

(vii) Check 3 does not take place ithin reclaim time# OK Not OK (viii) Check 3 does not take place in case of fault on Line Charging# OK Not OK

(i<) Check 3 does not take place in case of 2ailure of $LCC Carriers# OK Not OK

(<) 2urther, check 3 Interlocking in case of '

a# $ole discrepancy# OK Not OK "# irect trip received# OK Not OK

c# Over+voltage stage+I/II trips# OK Not OK

d# eactor protection trips# OK Not OK e# C7 .rou"les OK Not OK

f# *one+9 ; time delayed faults OK Not OK

(<i) In a one half / .o C7 scheme, Check 3 does not take place for OK Not OK

any one of the C7s under %/# Check 4emory Circuit Contact

status( C7 Closed/

Opened conditions)# Check 4emory Circuit .imer setting#

(<ii) Check Logics of 3 sitch Operation ( N3/8$h/9$h/;$h)# OK Not OK

(<iii) Check priority circuitry# Priority circuit of Tie CB should be OK Not

OK "ypassed is any of the main C7 is kept in Non 3uto

mode due to shutdon or outages#

(<iv) 3/ should not take place in NON 31.O mode

!. Local rea3er ac3 4p Protection:


(ii) Check ad=acent C7!s as ell as concerned 7us+7ar OK Not OK



Annexure - VI

.rip relays operate during operation of L77 relay#(iii) Check irect trip .ransfer takes place only for feeder under testing

during L77 operation# OK Not OK

. 4ner-#olta$e Relay


(ii) Check E/% interlock operation under relay energi>ed condition OK Not OK

vice versa#

. Direct *rip *ransfer

Check irect trip transfer in case of '(i) Over+voltage relay operations OK Not OK

(ii) eactor trip operations# OK Not OK

(iii) 4anual trip to One C7(4ain/.ie) hen another C7(.ie/4ain) in OK NotOK

same dia is under open condition#

(iv)L77 relay .rip' for "oth the main tie C7!s#(v) 7us"ar .rip to One C7(4ain/.ie) hen another C7(.ie/4ain) OK Not OK

in same dia is under open condition#(vi) .EE iff/ %.17 $rotection trip OK Not OK

(vii)irect trip .ransfer thr! 8st Chanel OK Not OK (viii) irect trip .ransfer thr! 9nd Chanel OK Not OK

(i<) Check . is not resulted "y 8st Chanel permissive trip OK Not OK

(<) Check . is not resulted "y 9nd Chanel permissive trip OK Not OK

%u,,ary of )oe *ransfer for PL))

Ch+8 Code+I 666 Ch+8 Code+9 666 Ch+9 Code+I 666 Ch+9 Code+9 666Check individual Code .ransfer to "e as per scheme OK Not OK

Ch+8 Code+I OK Not OK

Ch+8 Code+9 OK Not OK Ch+8 Code+; OK Not OK

Ch+9 Code+I OK Not OK

Ch+9 Code+9 OK Not OK

Ch+9 Code+;Check if signal through One code is not transferred to another OK Not OK

3t emote end

0. ) *rou'les:

(i) Check hether 3ll relays are given ela"orative nomenclatures# If not, $aste

descriptions( C7 LOB 3ir/Oil pressure, $ole discrepancy etc#) OK Not OK

(ii) Check Operations of individual elays "y actuating initiating

contacts# OK Not OK

(iii) Check facia/Event Logger Input Contacts for the same# OK Not OK



Annexure - VI

Line Reactor Protection

1. Differential Protection

(i) C. secondary Circuitry Checked iff current is Nil OK value66

"y $rimary In=ection for all $hases#

(ii) Check connection of sta"ili>ing resistance metrosil (herever applica"le)

(iii) Check C. Circuits so that summation of same phases(+, 0+0, 7+7) OK Not OK

is taking place#( %ome times +7 7+ summations are o"served due to rong Birings)#

(iv) If fed from .urret C.!s from "oth sides of $hase Bindings# OK Not OK Check Operate -alue/eset -alue/Operate .iming for all phases#

(v) 4easure differential pick up current# OK Not OK

(vi) Carry out sta"ility test "y simulating e<ternal and internal faults and measure spill currentsin ifferential circuit

(vii) Check 7iasing percentage, Operate -alue/eset -alue/Operate including

5igh set feature if applica"le OK Not OK

(viii) .iming for all phases(if "iased / percentage differential) OK Not OK (i<) Check 7locking of tripping on 5armonic estraints 2eature

( 9nd th harmonics) OK Not OK

(<) Check feature (if availa"le) OK Not OK

!. Restricte art+-ault Protection:Check Operate -alue/eset -alue/Operate .iming for all phases# OK Not OK





is taking place#( %ome times +7 7+ summations are o"served

due to rong Birings)#

(iv) If fed from .urret C.!s from "oth sides of $hase Bindings# OK Not OK

Check Operate -alue/eset -alue/Operate .iming for all phases#


(vi) Carry out sta"ility test "y simulating e<ternal and internal faults "y primary in=ection andmeasure spill currents in E2 relay

. ac3-4p I,peance Relay .ype '6666

i# &et a print of relay settings(herever applica"le) OK Not OK



Annexure - VI

ii# Compare ith recommended setting# OK Not OK iii# Check for each %etting ' OK Not OK

iv# Check time of operation ' OK Not OK

v# .est results of (iii) (iv) enclosed 0E% NOvi# Check %elective $hase tripping( $h fault to +$h .rip etc) OK Not OK

vii# Check trip 7lock in case of C-. 2use 2ailure# OK Not OK

viii# Check Communication to $C(If availa"le) OK Not OK

i<# Check .ime synchroni>ing "y altering .ime *one# OK Not OK estore on confirmation#

<# Check %elf+diagnostic feature of the relay (if provided) OK Not OK

<i# Check metering function of the relay (if provided)<ii# -erification of irectionality OK Not OK

. lectro,ec+anical Relays :

Check Operations of '(i) 7uchhol> 3larm trip OK Not OK

(ii) B.I 3larm trip' 3larm' .rip'

(iii) O.I 3larm trip 3larm' .rip'(iv) $ .rip# OK Not OK

(v) 4O&(LOL/Lo Oil Level) 3larm# OK Not OK

0. Direct *rip *ransfer

(i) In all cases of a"ove trippings, irect trip to remote end is sent# OK Not OK

3long ith tripping of 4ain/.ie C7!s

(ii) irect trip: 2rom line eactor L77 in case of OK Not OK sitcha"le reactor

2. Volta$e selection for Protection & Meterin$ :

Ensure -oltage inputs at specific terminals from '

(i) Line C-. OK Not OK

(ii) 7us+I C-.( say connected to C7+8) OK Not OK (iii) 7us+II C-.( say connected to C7+9) OK Not OK

Check NO/NC Contacts from C7+8 C7+9 for voltage selection# OK Not OK

(a) Open Line Isolator' Close C7+8 ' 7us+I C-. supply ill "e selected#

Check C-. %upply at selected C-. .erminals for 4etering $rotection OK Not OK .rip C7+8#

(") Close C7+9 ' 7us+II C-. supply ill "e selected#

Check C-. %upply at selected C-. .erminals for 4etering $rotection# OK Not OK .rip C7+9

(c) Close Line Isolator' Line C-. supply ill "e selected# OK Not OK

Close C7+8 9, No change in status of %election relays#

5. )+ec3 R6*I on )ontrol panel: OK Not OK



Annexure - VI

us Reactor Protection1. Differential Protection

(i) C. secondary Circuitry Checked iff current is Nil OK value66 "y $rimary In=ection for all $hases#








(vi) Carry out sta"ility test "y simulating e<ternal and internal faults and measure spill currents

in ifferential circuit

Check 7iasing percentage, Operate -alue/eset -alue/Operate OK Not OK .iming for all phases(if "iased / percentage differential)

!. Restricte art+-ault Protection:

Check Operate -alue/eset -alue/Operate .iming for all phases# OK Not OK





is taking place#( %ome times +7 7+ summations are o"served due to rong Birings)#

(iv) If fed from .urret C.!s from "oth sides of $hase Bindings# OK Not OK Check Operate -alue/eset -alue/Operate .iming for all phases#


(vi) Carry out sta"ility test "y simulating e<ternal and internal faults "y primary in=ection and

measure spill currents in E2 relay

. ac3-4p I,peance Relay .ype '6666

i# &et a print of relay settings(herever applica"le) OK Not OK

ii# Compare ith recommended setting OK Not OK iii# Check for each %etting ' OK Not OK

iv# Check time of operation ' OK Not OK

v# .est results of (iii) (iv) enclosed 0E% NO



Annexure - VI

vi# Check trip 7lock in case of C-. 2use 2ailure# OK Not OK vii# Check Communication to $C(If availa"le) OK Not OK

viii# Check .ime synchroni>ing "y altering .ime *one# OK Not OK

i<# estore on confirmation#<# Check %elf+diagnostic feature of the relay (if provided) OK Not OK

<i# Check metering function of the relay (if provided)

<ii# -erification of irectionality OK Not OK

. lectro,ec+anical Relays :Check Operations of '

(i) 7uchhol> 3larm trip OK Not OK

(ii) B.I 3larm trip' OK Not OK (iii) O.I 3larm trip OK Not OK

(iv) $ .rip# OK Not OK

(v) 4O&(Lo Oil Level) 3larm# OK Not OK

0. Direct *rip *ransfer

(i) In all cases of a"ove trippings, irect trip to remote end is sent# OK Not OK 3long ith tripping of 4ain/.ie C7!s

(ii) irect trip' 2rom line eactor L77 in case of sitcha"le reactor OK Not OK



(ii) Line C-.

(iii) 7us+I C-.( say connected to C7+8)(iv) 7us+II C-.( say connected to C7+9)


(a) Open Line Isolator' Close C7+8 ' 7us+I C-. supply ill "e selected# Check C-. %upply at selected C-.

.erminals for 4etering $rotection .rip C7+8# OK Not OK

(") Close C7+9 ' 7us+II C-. supply ill "e selected#Check C-. %upply at selected C-. .erminals for

4etering $rotection# .rip C7+9 OK Not OK






Annexure - VI

Auto-*ransfor,er Protection

1. Differential Protection










(vi) Carry out sta"ility test "y simulating e<ternal and internal faults and measure spill currentsin ifferential circuit

Check 7iasing percentage, Operate -alue/eset -alue/Operate OK Not OK .iming for all phases(if "iased / percentage differential)

!. Restricte art+-ault Protection:

Check Operate -alue/eset -alue/Operate .iming for all phases# OK Not OK

(i) C. secondary Circuitry Checked iff current is Nil OK value66 "y $rimary In=ection for all $hases#








(vi) Carry out sta"ility test "y simulating e<ternal and internal faults "y primary in=ection and

measure spill currents in E2 relay

. lectro,ec+anical Relays :

Check Operations of '

(i) 7uchhol> 3larm trip OK Not OK

(ii) B.I 3larm trip' 3larm' .rip'



Annexure - VI

(iii) O.I 3larm trip 3larm' .rip'(iv) $ .rip# OK Not OK

(v) 4O&(Lo Oil Level) 3larm# OK Not OK

(vi) Oil surge relay OK Not OK (vii) OL.C $rotections OK Not OK

. Direct *rip *ransfer

In all cases of a"ove trippings, irect trip to remote end is sent# OK Not OK 3long ith tripping of 4ain/.ie C7!s



(i) Line C-. OK Not OK

(ii) 7us+I C-.( say connected to C7+8) OK Not OK (iii) 7us+II C-.( say connected to C7+9) OK Not OK


(a) Open Line Isolator' Close C7+8 ' 7us+I C-. supply ill "e selected# Check C-. %upply at selected C-.

.erminals for 4etering $rotection .rip C7+8# OK Not OK (") Close C7+9 ' 7us+II C-. supply ill "e selected#

Check C-. %upply at selected C-. .erminals for 4etering $rotection# .rip C7+9 OK Not OK




5."#er lux Relay

(i) Checking of $ick up drop off value(3larm ) OK Not OK

(ii) Checking of $ick up drop off value(.rip ) OK Not OK

7. *ransfor,er "#erloa Relay

(i) Check Operation of alarm 2unction OK Not OK

(ii) Operate -alue of Current in secondary .erms 66666##(iii) Check time of operations# OK Not OK

(iv) Check if trip is provided on O/L $O-IE NO. $O-IE

8. Directional ac3-4p "/) & / Relay

Check -oltage+Current Circuit

(Ir A-6##, Iy + -6##, I" + -66)

(i) Check -oltage/Current summation for E/2 relay OK Not OK (ii) Check irectional element Operation OK Not OK

(iii) Check time of operation ith different operating

current# OK Not OK (iv) 3ttach &raph for I4. operation for future ref# 0E% No



Annexure - VI

)ontrol Panel

(1 )+ec3 ,eterin$ circuit alon$ 9it+ transucers first 'y seconary inection an t+ere 'y

Pri,ary inection 9it+ %tanar Volta$e & )urrents(as per sc+e,e

(i) Bith -oltmeter %elector sitch at various positions'

+0 0+7 7+ N 0N 7N OK Not OK

(ii) Bith 3mmeter selector sitch at various positions

0 7 OK Not OK

(iii) 4B /4-3r 4eters' OK Not OK

(iv) Check metering circuits ith $rimary in=ection for each OK Not OK

(v) phase separately# OK Not OK

(vi) Check for freDuency 4eters OK Not OK

!. )+ec3 Isolator Interloc3s :

(i) Isolator Operation hen 3d=acent C7 Open ' OK Not OK

(ii) Isolator Operation hen 3d=acent C7 Close ' Locked/ 1nlocked#

(iii) Check for all 7ay/Line/.ransformer/reactor isolators

ith reference to interlock scheme OK Not OK

. )+ec3 for us isolator Interloc3:

(i) Check %tatus of E/% interlock of 7us+I/II OK Not OK (ii) Isolator Operation hen 7us is earthed ' OK Not OK

(iii) Isolator Operation hen 7us is Not earthed ' Locked/ 1nlocked#

(Checking can "e done ith engaging/isengaging Contact 4ultiplication relay#)

.)+ec3 for /% Interloc3(Line:

(i) Check E/% 4ech#interlock in case Line isolator is closed# OK/ Not OK

(ii) 1/- relay Operate/eset -oltage 666#/666##(iii) E/% Operation hen 1/- relay de+energi>ed OK/ Not OK

0.)+ec3 for /% Interloc3(ay:

Check E/% 4ech#interlock in case isolator is closed# OK/ Not OK

Check E/% interlock in case isolator in same "ay is closed# OK/ Not OK

Check E/% 3u<# Contact for Local C7 Close I/$ OK/ Not OK

2. %ync+roni;ation )+ec3

(i) Check C supply at %pecific $oints on %ynchro+Check $lug/%ocket# OK Not OK (ii) Check C-. supply at incoming running earth $oints on

%yncro+Check $lug/%ocket# OK Not OK

(iii) C(:ve) to "e e<tended to Closing Coil of C7 "y %ynchro+.rolley# OK Not OK (iv) No close Operation of C7 B/O connecting putting on OK Not OK

%ynchro+.rolley#

(v) .rip Operation is un"ound# OK Not OK



Annexure - VI

(vi) Check Incoming/running voltage selection and same phase must "e selected for a particular

su"+station#

(vii) %ynchroni>ing socket pin configuration must "e same for trolly and control panel for all "ays

(viii) -oltage selection' -erify operating as ell as resetting logic ( "oth logic should "e

mutually inverted)#

5. )+ec3in$ of Isolator Inications :

Isolator No6666##

(i Checking of Isolator Close Indication' ' OK Not OK

(ii Checking of Isolator Open Indication' ' OK Not OK

(iii Check %emaphore for E/% Close for Isolator+66 ' OK Not OK

(i# Check %emaphore for E/% Open for Isolator+66 ' OK Not OK

(# Check Operation if ad=acent C7 closed 'OK / Not OK

(#i Check Operation if ad=acent C7 O$ENed 'OK / Not OK

(#ii Check all NO/NC status as per scheme 'OK / Not OK

(#iii Check all interlock status as per scheme 'OK / Not OK 7. )+ec3in$ of ) Inications :

C7 No6666##(i) Checking of C7 Close Indication' ' OK Not OK

(ii) Checking of C7 Open Indication' 'OK Not OK

(iii) Check C healthy indication 'OK Not OK (iv) Check Local Closing I/L as per scheme' OK Not OK

(v) Check 3u<# Contact for C-. selection 'OK Not OK

(vi) Check 3u<# Contact for irect trip 'OK Not OK (vii) (In series ith .C% of ad=acent C7)

(viii) Check 3u<# Contact for %ync circuit 'OK Not OK

(i<) Check all 3nnunciations $oints for C7 .rou"les 'OK Not OK (<) $ole iscrepancy .iming set Checked 'OK Not OK

(<i) $ole iscrepancy Operation Checked ' OK Not OK

(<ii) 3ll $ressure sitch settings/contacts checked ' OK Not OK

(<iii) Check 3nti+5unting Operation ' OK Not OK

8. )+ec3in$ of Isolator )ontrol %9itc+ :

Isolator No6666##

Biring %tatus of Contacts as per %cheme OK Not OK 6666666666

1<. )+ec3in$ of ) )ontrol %9itc+ :

C7 No6666##

(i) Biring %tatus of Contacts as per %cheme OK Not OK (ii) 3nnunciation 2acia 3ll Borking properly OK Not OK

6666666666

11. )ontrol Panel:

(i) Check for control fuse failure

(ii) Check that the control fuse failure alarm is reported to station ser "y removing one of the

:ve/+ve fuse in control ckt#(iii) Check that control C is free from earthing OK Not OK

(iv) Check there is no mi<ing of source I II OK Not OK



Annexure - VI

1!. acia )+ec3in$ :

(i) Checking for proper functioning of 3nnunciation 2acia ith

individual elements of scheme# OK Not OK

(ii) Indication for 3C supply failure OK Not OK



Annexure - VI

us'ar Protection

elay Name *one+I666 *one+II6666 Check *one6666##


*one+I# OKNot OK

*one+II# OKNot OK Check *one OKNot OK

7lock 3uto+reclose for all C7!s Connected *one+I OKNot OK

*one+II OKNot OK

(ii) If directional Element provided ,elay tested 0E% NO irection found O#K

(iii) .est results enclosed accepted 0E% NO

(iv) *one+I .ripping e<tended to '.rip relay Location 6666 for C7 No6## L77 Initiated 0es / No $LCC/#. 0es / No.rip relay Location 6666 for C7 No6## L77 Initiated 0es / No $LCC/#. 0es / No

.rip relay Location 6666 for C7 No6## L77 Initiated 0es / No $LCC/#. 0es / No

6666666666#6666666666#

(v) *one+II .ripping e<tended to '




6666666666#6666666666#

(vi) L77/72 trip checked e<tended to *one+I

2rom C7 No66666# OK Not OK


2rom C7 No66666# OK Not OK 666666666666666#

(vii) L77/72 trip checked e<tended to *one+II

2rom C7 No66666# OK Not OK 2rom C7 No66666# OK Not OK


666666666666666#

(viii) .ransfer 7us .rip Checked OK Not OK N#3

(i<) Close Interlock in case of 77 .rip Checked OK Not OK

for all applica"le C7!s

(<) E%E. Borking properly 0E% NO

(<i) C selection orking properly for C+I II 0E% NO



Annexure - VI

(<ii) Carry out sta"ility test "y simulating e<ternal and internal faults "y primary in=ection andmeasure spill currents in 7us "ar differential relay

(<iii) -erify sta"ili>ing resistor 4etrosil connection(herever applica"le)(<iv) Check for C. sitching relay operation, in case of 4. scheme "y closing respective

isolators# 3lso in=ect current at the relay panel entry point and measure current at 7us 7ar

protection relay terminals after operating respective C. sitching relay#



Annexure - VI

"t+ers:1. Distur'ance recorer :

(i) Check communication to $C/.erminals/$rinters# OK Not OK (ii) Check 3ll 3nalog Inputs (+0+7+residual -oltages OK Not OK

+0+7+Neutral currents)

(iii) Check Conversion( $rimary to secondary ratio) settings OK Not OK

are programmed as per scheme#(iv) Check contacts status of all digital inputs# OK Not OK

(v) Normally si< I/$!s are from .o C7!s# check %elective OK Not OK $hase operation for 07 $oles for "oth the C7!s#

Ensure proper sho of $hase/$ole#

(vi) Check 3nalog threshold setting# OK Not OK

(vii) Check hether all digital Inputs are programmed for initiation OK Not OK of recording istur"ance as ell as right status( NO/NC)#

(viii) un self+diagnostic program get a print for future reference OK Not OK#

Otherise, note don various -oltages at 4onitoring points#(i<) %imulate a distur"ance "y shorting contacts of a igital I/$# OK Not OK

Check recording in progress# $rint the same#(<) epeat the a"ove for all digital I/$ Contacts# OK Not OK (<i) (if provided) 2or analog threshold values, connect to %tandard OK Not OK

test kit to test .hreshold -alue initiation of recording

"y -arying -oltages 2reDuencies( -oltage .hreshold, 2reDuency

thresholds 2/. thresholds#(<ii) Check .ime synchroni>ing "y altering .ime *one# OK Not OK

estore on confirmation

(<iii) Check all analogue digital inputs are configured per poer grid standard list# OK Not OK

(<iv) compare/Check analog value displayed on $C ith the

in=ected input analog value# OK Not OK (<v) .ake a print out of settings keep for

feature reference# OK Not OK

(<vi) Check for availa"ility of proper softare OK Not OK

!. %e=uential #ent Recorer:

(i) Check communication to $C/.erminals/$rinters# OK Not OK

(ii) Check contacts status of all digital inputs# OK Not OK (iii) Check hether all digital Inputs are programmed ith OK Not OK

right status( NO/NC)#

(iv) %elective checking of each every contacts is to "e done OK Not OK

in seDuences#$rint+Out/isplay is to "e compared#(v) Normally si< I/$!s are from .o C7!s# check %elective OK Not OK

$hase operation for 07 $oles for "oth the C7!s#Ensure proper sho of $hase/$ole#

(vi) Check .ime synchroni>ing "y altering .ime *one# OK Not OK

estore on confirmation

(vii) .ake a print out of plant status (if availa"le) and compare iththe actual status OK Not OK

(viii) Check for availa"ility of proper softare site programma"ility



Annexure - VI

of event te<t OK Not OK

. "L*)/R*)) for *ransfor,er

(i) OL.C Operation checked from'Local $anel OK Not OK

emote $anel OK Not OK

%uper/Control $anel OK Not OK

(ii) .ap $osition isplay OK Not OK

Correct .ap position display at local panel at remote display ith respective OL.C indicator#

(iii) 3ll Indicating lamps checked OK Not OK

(iv) .ap $osition iscrepancy .rip OK Not OK

(iv) 4aster/2olloer scheme Checked for 4aster 'former+8 OK Not OK 4aster 'former+9 OK Not OK

4aster 'former+; OK Not OK

(-) Check auto supply changeover feature for O.LC/.ransformer (If availa"le)



Annexure - VI

%)ADA

2eed at %pecific .erminal ith %tandard -oltage Currents(as per scheme)4onitor the -alues on 4I4IC/ %41/

3#

(i) -oltage .ransducer Input 66# - Output66# m3 ata isplayed666

(ii) 2reDuency .ransducer Input 66# - Output66# m3 ata isplayed666(iii) 4B .ransducer Input 6 - 6 m3 Output# m3 ata isplayed666

(iv) 4-3r .ransducer Input 6 - 6 m3 Output# m3 ata isplayed6667# If ifference is o"served give details 8#66666666666666#

9#66666666666666#

;#66666666666666#

C# .rou"le due to ' .ransducer/ ata Conversion/ Comm#error/rong iring/Other

# .rou"le attri"uta"le to 6666666666666666666666#

E# %uggestion for improvement66666666666666666666##

>eneral :(i) 4any a time, different 3u<iliary voltages are used OK Not

OK

for drive poer of EL#2or e<ample, relay C is 99F -,

has it!s isolated optical I/$ , EL has F - drive C#

Conscious effort is to "e put to keep all voltage contacts of relay, EL isolated from each other#

(ii) Cross+ferruling method is to "e adopted in all cases OK Not

OK for easy maintenance in future#

(iii) In case any changes are to "e made in terminal designation, ONE Not

ONE corresponding change in ferruling '

(iv) In each every panel 4arshalling 7o<es/Kiosks, $rovided Not

provided

C. C-. Circuits must "e provided ith

Disconnectin$ stu type terminals#

9F@ spare .7!s provided in all types $rovided Not provided

(v) Close Interlock of C7' In case trip relay is energi>ed, OK NotOK

Close command not forarded# Normally, 4anual Close

command from C$ must "e in series ith One set of NC contact

of the .rip relay#(vi) C7 in O22 Condition %elective checking of .rip+CK. OK Not OK

%upervision relay of all C7!s#"y Opening ire from .C,one "y One#epeat the same ith C7 in On Condition#

(vii) $ermissive .ripping command thr! $LCC 4ain+I 4ain+II

8st C5# eturn .ime 666# m% 666# m%

9nd C5# eturn .ime 666# m% 666# m%(viii) If su"stantial difference noted in a"ove 666666666666666666

reason for the diff#

(i<) 3ny $rospect for reduction of iff# in .ime 0E% NO



Annexure - VI

(<) 5anging of .1 reported in Event logger 0E% NO(<i) eporting of communication failure of each channel in %E 0E% NO

(<ii) 3ny data error encountered during isolator operation 0E% NO

%uggestion for improvement66666666666666666666##



Annexure - VI

>eneral:

%ingle point earthing must "e ensured for C.$. circuit# 0E% NO

Check List Pre of Comm Relays

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Transcript of Check List Pre of Comm Relays