5. Fault Locator
Feed FL & Distance relay with same Voltage & Current from test Kit. Simulate Zone-I/II, Single Ph/Ph-Ph/3Ph Fault to Main-I/II Distance relay.
i Check initiation by Distance relay OK/ NOT OK
ii Compare Fault location by calculating the Set Vale on test Kit OK/ NOT OK
iii Repeat the above up to 99% in steps OK/ NOT OK
iv. Check healthiness of mutual compensation circuit OK/ NOT OK 6. Disturbance Recorder
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
iv Check automatic downloading feature OK/ NOT OK
v Check time synchronizing feature OK/ NOT OK
vi Verify open delta voltage in DR channel OK/ NOT OK
vii Check diagnostic feature(if provided) OK/ NOT OK
7. Final Documentation Review
S.No. Description Status
1. Final document of Pre-commissioning checks reviewed and approved
2. Documents regarding spares, equipment, factory reports, O&M manuals etc. available at site for O&M purpose
3. After modification, if any, “As built drawing are available at
site
1. Auto-reclose Scheme: (Checks applicable for distance protection scheme with auto re-closure function as well)
i
Check auto reclose initiation/Block contacts for
a Transient Single Phase Earth fault OK/ NOT OK
b Non initiation for 1 phase fault in Zone II OK/ NOT OK
c Transient Ph-Ph Fault OK/ NOT OK
d Transient 3 Phase Faults OK/ NOT OK
e Permanent Faults OK/ NOT OK
ii Simulate Zone-I ,Single Ph Transient E/F to Main-I/II Distance relay Check AR for all 3 Phases,one by One
OK/ NOT OK iii Loop CS & CR, Simulate Zone-II ,Single Ph Transient E/F to
Main-I/II Distance relay Check AR for all 3 Phases, one by One
OK/ NOT OK iv Check settings & operation of Synchronizing/DLC relays OK/ NOT OK
v Measure Dead Time setting ………ms
vi Measure Reclaim Timer setting OK/ NOT OK
vii Check AR does not take place within reclaim time OK/ NOT OK viii Check AR does not take place in case of fault on Line Charging. OK/ NOT OK
ix
Check AR does not take place in case of Failure of PLCC Carriers
c Over-voltage stage-I/II trips OK/ NOT OK
d Reactor protection trips OK/ NOT OK
e CB Troubles OK/ NOT OK
f Zone-2 & 3 time delayed faults OK/ NOT OK
xi In a one & half / Two CB scheme, Check AR does not take place for any one of the CBs under S/D. Check Memory Circuit Contact status( CB Closed/Opened conditions). Check Memory Circuit Timer setting.
OK/ NOT OK
xii Check Logics of AR switch Operation ( NA/1Ph/2Ph/3Ph). OK/ NOT OK xiii Check priority circuitry. Priority circuit of Tie CB should be
bypassed is any of the main CB is kept in Non Auto mode due to shutdown or outages
OK/ NOT OK
xiv A/R should not take place in NON AUTO mode OK/ NOT OK
4. TEE Differential-I/II (5 CT scheme)
i Check Operate Value/Reset Value/Oper ate Timing for all phases OK/ NOT OK ii Check tripping of Main/Tie CB & send Direct trip to remote end OK/ NOT OK
iii Check stability for out zone fault OK/ NOT OK
iv. If Biased differential, check Biasing percentage for all phases OK/ NOT OK
5. Fault Locator
Feed FL & Distance relay with same Voltage & Current from test Kit. Simulate Zone-I/II, Single Ph/Ph-Ph/3Ph Fault to Main-I/II Distance relay.
i Check initiation by Distance relay OK/ NOT OK
ii Compare Fault location by calculating the Set Vale on test Kit OK/ NOT OK
iii Repeat the above up to 99% in steps OK/ NOT OK
iv. Check healthiness of mutual compensation circuit OK/ NOT OK 6. Disturbance Recorder
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
iv Check automatic downloading feature OK/ NOT OK
v Check time synchronizing feature OK/ NOT OK
vi Verify open delta voltage in DR channel OK/ NOT OK
vii Check diagnostic feature(if provided) OK/ NOT OK
7. Final Documentation Review
S.No. Description Status
1. Final document of Pre-commissioning checks reviewed and approved
2. Documents regarding spares, equipment, factory reports, O&M manuals etc. available at site for O&M purpose
3. After modification, if any, “As built drawing are available at
site
1. Auto-reclose Scheme: (Checks applicable for distance protection scheme with auto re-closure function as well)
i
Check auto reclose initiation/Block contacts for
a Transient Single Phase Earth fault OK/ NOT OK
b Non initiation for 1 phase fault in Zone II OK/ NOT OK
c Transient Ph-Ph Fault OK/ NOT OK
d Transient 3 Phase Faults OK/ NOT OK
e Permanent Faults OK/ NOT OK
ii Simulate Zone-I ,Single Ph Transient E/F to Main-I/II Distance relay Check AR for all 3 Phases,one by One
OK/ NOT OK iii Loop CS & CR, Simulate Zone-II ,Single Ph Transient E/F to
Main-I/II Distance relay Check AR for all 3 Phases, one by One
OK/ NOT OK iv Check settings & operation of Synchronizing/DLC relays OK/ NOT OK
v Measure Dead Time setting ………ms
vi Measure Reclaim Timer setting OK/ NOT OK
vii Check AR does not take place within reclaim time OK/ NOT OK viii Check AR does not take place in case of fault on Line Charging. OK/ NOT OK
ix
Check AR does not take place in case of Failure of PLCC Carriers
c Over-voltage stage-I/II trips OK/ NOT OK
d Reactor protection trips OK/ NOT OK
e CB Troubles OK/ NOT OK
f Zone-2 & 3 time delayed faults OK/ NOT OK
xi In a one & half / Two CB scheme, Check AR does not take place for any one of the CBs under S/D. Check Memory Circuit Contact status( CB Closed/Opened conditions). Check Memory Circuit Timer setting.
OK/ NOT OK
xii Check Logics of AR switch Operation ( NA/1Ph/2Ph/3Ph). OK/ NOT OK xiii Check priority circuitry. Priority circuit of Tie CB should be
bypassed is any of the main CB is kept in Non Auto mode due to shutdown or outages
OK/ NOT OK
xiv A/R should not take place in NON AUTO mode OK/ NOT OK
2. Local Breaker Back Up Protection:
i Check Operate Value/Reset Value/Oper ate Timing for all phases OK/ NOT OK ii Check adjacent CB’s as well as concerned Bus-Bar Trip relays
operate during operation of LBB relay
OK/ NOT OK iii Check Direct trip Transfer takes place only for feeder under
testing during LBB operation
OK/ NOT OK
3. Under-voltage Relay
i Check Operate Value/Reset Value/Operate Timing for all phases OK/ NOT OK ii Check E/S interlock operation under relay energized condition
& vice versa
OK/ NOT OK
4. Direct Trip Transfer
a. Check Direct trip transfer in case of:
i Over-voltage relay operations OK/ NOT OK
ii Reactor trip operations. OK/ NOT OK
iii Manual trip to One CB(Main/Tie) when another CB(Tie/Main) in same dia is under open condition
OK/ NOT OK iv LBB relay Trip: for both the main & tie CB’s OK/ NOT OK
v Busbar Trip to One CB(Main/Tie) when another CB(Tie/Main) in same dia is under open condition
OK/ NOT OK
vi TEE Diff/ STUB Protection trip OK/ NOT OK
vii Direct trip Transfer thr’ 1st Chanel OK/ NOT OK
viii Direct trip Transfer thr’ 2nd Chanel OK/ NOT OK
ix Check DT is not resulted by 1st Chanel permissive trip OK/ NOT OK x Check DT is not resulted by 2nd Chanel permissive trip OK/ NOT OK
b. Summary of Code Transfer for PLCC
Ch-1 Code-I……… Ch-1 Code-2 ……… Ch-2 Code-I ……… Ch-2 Code-2 ………
i Check individual Code Transfer to be as per scheme OK/ NOT OK
ii Ch-1 Code-I OK/ NOT OK
iii Ch-1 Code-2 OK/ NOT OK
iv Ch-1 Code-3 OK/ NOT OK
v Ch-2 Code-I OK/ NOT OK
vi Ch-2 Cod e-2 OK/ NOT OK
vii Ch-2 Code-3 OK/ NOT OK
viii Check if signal through One code is not transferred to another at Remote end
OK/ NOT OK
5. CB Troubles
i
Check whether All relays are given elaborative nomenclatures. If not, Paste descriptions (CB LOW Air/Oil pressure, Pole
discrepancy etc.)
OK/ NOT OK
ii Check Operations of individual Relays by actuating initiating Contacts from field
OK/ NOT OK iii Check facia/Event Logger Input Contacts for the same OK/ NOT OK
6. Final Documentation Review
S.No. Description Status
(Yes/ No)
Remarks(Record deficiencies, if any)
1. Final document of Pre-commissioning checks reviewed and approved
2. Documents regarding spares, equipment, factory reports, O&M manuals etc. available at site for O&M purpose
3. After modification, if any, “As built drawing are available at
site
Signature: Name: Desgn.: Organization: (Supplier Representative) (Wherever Applicable)
Signature: Name: Desgn.:
(Erection Agency)
Signature: Name: Desgn.:
(POWERGRID Site I/C)
Signature: Name: Desgn.:
(POWERGRID Commg. Team) Members:
2. Local Breaker Back Up Protection:
i Check Operate Value/Reset Value/Oper ate Timing for all phases OK/ NOT OK ii Check adjacent CB’s as well as concerned Bus-Bar Trip relays
operate during operation of LBB relay
OK/ NOT OK iii Check Direct trip Transfer takes place only for feeder under
testing during LBB operation
OK/ NOT OK
3. Under-voltage Relay
i Check Operate Value/Reset Value/Operate Timing for all phases OK/ NOT OK ii Check E/S interlock operation under relay energized condition
& vice versa
OK/ NOT OK
4. Direct Trip Transfer
a. Check Direct trip transfer in case of:
i Over-voltage relay operations OK/ NOT OK
ii Reactor trip operations. OK/ NOT OK
iii Manual trip to One CB(Main/Tie) when another CB(Tie/Main) in same dia is under open condition
OK/ NOT OK iv LBB relay Trip: for both the main & tie CB’s OK/ NOT OK
v Busbar Trip to One CB(Main/Tie) when another CB(Tie/Main) in same dia is under open condition
OK/ NOT OK
vi TEE Diff/ STUB Protection trip OK/ NOT OK
vii Direct trip Transfer thr’ 1st Chanel OK/ NOT OK
viii Direct trip Transfer thr’ 2nd Chanel OK/ NOT OK
ix Check DT is not resulted by 1st Chanel permissive trip OK/ NOT OK x Check DT is not resulted by 2nd Chanel permissive trip OK/ NOT OK
b. Summary of Code Transfer for PLCC
Ch-1 Code-I……… Ch-1 Code-2 ……… Ch-2 Code-I ……… Ch-2 Code-2 ………
i Check individual Code Transfer to be as per scheme OK/ NOT OK
ii Ch-1 Code-I OK/ NOT OK
iii Ch-1 Code-2 OK/ NOT OK
iv Ch-1 Code-3 OK/ NOT OK
v Ch-2 Code-I OK/ NOT OK
vi Ch-2 Cod e-2 OK/ NOT OK
vii Ch-2 Code-3 OK/ NOT OK
viii Check if signal through One code is not transferred to another at Remote end
OK/ NOT OK
5. CB Troubles
i
Check whether All relays are given elaborative nomenclatures. If not, Paste descriptions (CB LOW Air/Oil pressure, Pole
discrepancy etc.)
OK/ NOT OK
ii Check Operations of individual Relays by actuating initiating Contacts from field
OK/ NOT OK iii Check facia/Event Logger Input Contacts for the same OK/ NOT OK
6. Final Documentation Review
S.No. Description Status
(Yes/
No)
Remarks(Record deficiencies, if any)
1. Final document of Pre-commissioning checks reviewed and approved
2. Documents regarding spares, equipment, factory reports, O&M manuals etc. available at site for O&M purpose
3. After modification, if any, “As built drawing are available at
site
Signature:
Name:
Desgn.:
Organization:
(Supplier Representative) (Wherever Applicable)
Signature:
Name:
Desgn.:
(Erection Agency)
Signature:
Name:
Desgn.:
(POWERGRID Site I/C)
Signature:
Name:
Desgn.:
(POWERGRID Commg. Team) Members: