LV Switchgear Final
Content
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear PLANT DETAILS & TECHNICAL SPECIFICATION Plant Details: In 350MW plant LT switchgear have two I/C & one B/C with manual change over scheme in MCC & Auto change over scheme in PCC. All LT switchgear is fed from 6600/433V dry type service transformer. Total ________ ( at GKEL) no’s LT switchgear is installed at the plant. (IEC-439/947/269 at GKEL) _____________________ Standards are followed. TECHNICAL SPECIFICATION SR. NO. 01 02 03 04 05 06 07 08 09 DESCRIPTION Make Voltage Rating Frequency No. Of phase Degree of protection System fault level Auxiliary supply Power supply for spring charging Overall dimension of PMCC Length (mm): Depth (mm): Height (mm): Max. Size/ no. Of PVC insulated Al. Cond. Cables that can be terminated inside the panel Clearance in air Phase to phase: Phase to earth: Main bus & Earth bus size & material CB Rating, Type & no’s Contactor Rating, Type & no’s Switch Rating, Type & no’s Thermal overload relay Rating, Type & no’s Fuses Rating, Type & no’s Type of circuit breaker Duty cycle of breaker Incoming power entry Cable entry (O/G) DATA
10 11 12 13 14 15 16 17 18 19 20 21
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 22 23 Bus duct entry Cable gland/ lugs
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 1- TEST METHOD 7.1 7.2 SR. NO. 7.2. 1 VISUAL CHECKING: Visual checking to be done as per precommissioning checklist (11.3). TESTING: Following test to be carried out to the following equipment & data to be filled as per testing format (11.5). DESCRIPTION Bus-bars:
a) Mili-volts drop test for the contact resistance
REMARK
value.
b) IR values between phase to phase and phase to
ground. 7.2. 2 Current Transformer: a) Winding resistance measurement b) Terminal marking correctness. c) Polarity of terminals. d) Insulation resistance between primary and secondary, primary to earth and secondary to earth. e) Magnetization characteristic and knee point voltage test. f) Ratio test. Voltage Transformer : 7.2. 3 a) Terminal markings b) Polarity checks of terminals
c) Insulation resistance between primary Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear and secondary d) Insulation resistance between primary to earth and secondary to earth. e) Ratio test. f) Whether PT can supply as per the burden of load check. g) Winding resistance measurement. h) Magnetisation Characteristics. Relays:
a) Pickup and dropout value check
7.2. 4
b) Insulation resistance of contacts and relay coil. c) Time delay (if relay is not instantaneous),
operating time value check of relay.
d) See that the correct circuit breaker trips on
energisation of the particular relay
e) Continuity checks of contacts after
energisation of relay.
f) See if plug-shorting contacts are correct. g) Burden check of relay h) Primary injection test i) Secondary injection test.
415V Breaker: a) Mili-volt drops test between the interrupting contacts and between the isolator contacts. Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 7.2. 5 b) Closing and opening timing of the breaker. c) Measure the insulation resistance for the following points. ACB closed condition: Each pole to earth Each pole to pole ACB open condition: Between same pole (Top &Bottom) These values will be around 500 MegaOhms d) Checking whether the breaker trips or closes when the logics are fulfilled Calibration of Ammeter Voltmeter and Energy meter. Change over scheme. 7.2. 6 7.2. 7 211.1- ELECTRCAL PLANT ITEM COMPLETION LIST SR. NO. DESCRIPTION 01 Panel erection 02 Bus bar erection 03 Inter panel wiring 04 Earthing connection Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) STATUS DATE
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 11.2CHECK LIST SWITCHGEAR INSPECTION CHECKLIST Plant: Location: Manufacture: Voltage Rating: Current Rating: Interrupting Rating: CHECK POINT Check exterior of switchgear Check equipment identification Reference Drawing Check electrical/ mechanical draw out mechanism & interlocks Check proper phase connection & color code Check bus & support insulator Check incoming line connections to main bus Check tightness of the following areaa) Bus bar joint b) Power cable termination c) Control wiring d) Earthing connection Check manual operation of CB’s & relays Check CB operation electrically from local & DCS Check all the feedbacks/parameters are available in DCS Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
50kA A) VISUAL INSPECTION CONDITION REMARKS
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear Check CB’s insulating parts Check breaker contact surface Check instrument & relay cover Check proper equipment grounding to grounding bus Check switches operation Verify proper rating of CB’s, MCB’s & fuses Check control wiring for proper operation, indication. Check all mechanical & electrical interlock Check all fuses for healthiness & rating Check current circuit for tightness, short link, no open circuit, meter reading. Check all cable supported properly Check heater healthiness & auto control circuit. Note thermostat settings. Check working clearance Check proper lubrication Check switchgear cleanliness Check for proper ventilation to maintain ambient temp. within design limit Check vermin proofing done properly Check housekeeping of switchgear room
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
11.3- CHARGING PROCEDURE 415V MCC CHARGING PROCEDURE Task Description 1. Confirm that Pre-commissioning checks are completed for MCC and upstream PMCC Feeder(s) 2. Confirm that Relay settings are adopted as per recommendation for upstream PMCC Feeder(s), Bus Coupler and Bus PT relays if applicable 3. Ensure availability of Fire Extinguisher 4. Obtain clearance from working parties 5. Test & record final IR of Incomer Power cables. Confirm proper termination at both ends 6. Test & record final IR of MCC Bus 7. Confirm that all covers are closed on MCC and upstream PMCC 8. Ensure that all outgoing feeders of MCC are Isolated 9. Ensure that PTs and Auxiliary transformers of MCC are racked in, with all fuses intact 10. Ensure that MCC Incomers and Bus Coupler are Racked out / OFF 11. Rack in the upstream CB, if applicable 12. Note the bus voltage of upstream PMCC and confirm that it is within normal range (415V ± 10%) 13. Close the upstream PMCC Feeder, thereby charging the Power cable 14. Check the voltages at MCC Incomer PT voltmeter. Record PT secondary voltages in the table below. 15. Close the Incomer 1 ACB / SFU / Isolator, thereby charging Bus-1 of the MCC 16. Check the voltages at Bus-1 PT voltmeter. Record PT secondary voltages in the table below. Confirm the positive phase sequence from outgoing feeder. 17. Close the Bus Coupler ACB / SFU, thereby charging Bus-2 Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) Inc 1 Inc 2
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 18. Check the voltages at Bus-2 PT voltmeter. Record PT secondary voltages in the table below. Confirm the positive phase sequence from outgoing feeder. 19. Phase out between the Bus-1 and Bus-2 (through outgoing feeders), and record. A proper phase match is essential. 20. Check proper functioning of control transformers for 110V and 230V, including changeover If both sources are available: 21. Open Bus Coupler ACB / SFU 22. Close the MCC Incomer 2 ACB / SFU / Isolator, thereby charging Bus-2 of the MCC 23. Check the voltages at Bus-2 PT voltmeter. Record PT secondary voltages in the table below. 24. Phase out between the secondary voltages of the Bus-1 and Bus-2 PTs, and record. A proper phase match indicates that the two sources are in phase. Voltage record:Configuration Vab Vbc Vca Va-earth Vb-earth Vc-earth Vn-earth Phase-out record Bus-1 PT Bus-2 PT Bus-1 and Bus-2 fed from same source Va Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) Va Vb Inc-1 PT Inc-2 PT Bus-1 PT (fed from source-1 Bus-2 PT (fed from source-1) Bus-2 PT (fed from source-2
Bus-1 fed from source-1 and Bus-2 fed from source-2
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear Vc Va Vb Vc Va Vb Vc
Vb Vc
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear PLANT DETAILS & TECHNICAL SPECIFICATION Plant Details: In 350MW plant LT switchgear have two I/C & one B/C with manual change over scheme in MCC & Auto change over scheme in PCC. All LT switchgear is fed from 6600/433V dry type service transformer. Total ________ ( at GKEL) no’s LT switchgear is installed at the plant. (IEC-439/947/269 at GKEL) _____________________ Standards are followed. TECHNICAL SPECIFICATION SR. NO. 01 02 03 04 05 06 07 08 09 DESCRIPTION Make Voltage Rating Frequency No. Of phase Degree of protection System fault level Auxiliary supply Power supply for spring charging Overall dimension of PMCC Length (mm): Depth (mm): Height (mm): Max. Size/ no. Of PVC insulated Al. Cond. Cables that can be terminated inside the panel Clearance in air Phase to phase: Phase to earth: Main bus & Earth bus size & material CB Rating, Type & no’s Contactor Rating, Type & no’s Switch Rating, Type & no’s Thermal overload relay Rating, Type & no’s Fuses Rating, Type & no’s Type of circuit breaker Duty cycle of breaker Incoming power entry Cable entry (O/G) DATA
10 11 12 13 14 15 16 17 18 19 20 21
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 22 23 Bus duct entry Cable gland/ lugs
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 1- TEST METHOD 7.1 7.2 SR. NO. 7.2. 1 VISUAL CHECKING: Visual checking to be done as per precommissioning checklist (11.3). TESTING: Following test to be carried out to the following equipment & data to be filled as per testing format (11.5). DESCRIPTION Bus-bars:
a) Mili-volts drop test for the contact resistance
REMARK
value.
b) IR values between phase to phase and phase to
ground. 7.2. 2 Current Transformer: a) Winding resistance measurement b) Terminal marking correctness. c) Polarity of terminals. d) Insulation resistance between primary and secondary, primary to earth and secondary to earth. e) Magnetization characteristic and knee point voltage test. f) Ratio test. Voltage Transformer : 7.2. 3 a) Terminal markings b) Polarity checks of terminals
c) Insulation resistance between primary Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear and secondary d) Insulation resistance between primary to earth and secondary to earth. e) Ratio test. f) Whether PT can supply as per the burden of load check. g) Winding resistance measurement. h) Magnetisation Characteristics. Relays:
a) Pickup and dropout value check
7.2. 4
b) Insulation resistance of contacts and relay coil. c) Time delay (if relay is not instantaneous),
operating time value check of relay.
d) See that the correct circuit breaker trips on
energisation of the particular relay
e) Continuity checks of contacts after
energisation of relay.
f) See if plug-shorting contacts are correct. g) Burden check of relay h) Primary injection test i) Secondary injection test.
415V Breaker: a) Mili-volt drops test between the interrupting contacts and between the isolator contacts. Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 7.2. 5 b) Closing and opening timing of the breaker. c) Measure the insulation resistance for the following points. ACB closed condition: Each pole to earth Each pole to pole ACB open condition: Between same pole (Top &Bottom) These values will be around 500 MegaOhms d) Checking whether the breaker trips or closes when the logics are fulfilled Calibration of Ammeter Voltmeter and Energy meter. Change over scheme. 7.2. 6 7.2. 7 211.1- ELECTRCAL PLANT ITEM COMPLETION LIST SR. NO. DESCRIPTION 01 Panel erection 02 Bus bar erection 03 Inter panel wiring 04 Earthing connection Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) STATUS DATE
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 11.2CHECK LIST SWITCHGEAR INSPECTION CHECKLIST Plant: Location: Manufacture: Voltage Rating: Current Rating: Interrupting Rating: CHECK POINT Check exterior of switchgear Check equipment identification Reference Drawing Check electrical/ mechanical draw out mechanism & interlocks Check proper phase connection & color code Check bus & support insulator Check incoming line connections to main bus Check tightness of the following areaa) Bus bar joint b) Power cable termination c) Control wiring d) Earthing connection Check manual operation of CB’s & relays Check CB operation electrically from local & DCS Check all the feedbacks/parameters are available in DCS Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
50kA A) VISUAL INSPECTION CONDITION REMARKS
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear Check CB’s insulating parts Check breaker contact surface Check instrument & relay cover Check proper equipment grounding to grounding bus Check switches operation Verify proper rating of CB’s, MCB’s & fuses Check control wiring for proper operation, indication. Check all mechanical & electrical interlock Check all fuses for healthiness & rating Check current circuit for tightness, short link, no open circuit, meter reading. Check all cable supported properly Check heater healthiness & auto control circuit. Note thermostat settings. Check working clearance Check proper lubrication Check switchgear cleanliness Check for proper ventilation to maintain ambient temp. within design limit Check vermin proofing done properly Check housekeeping of switchgear room
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
11.3- CHARGING PROCEDURE 415V MCC CHARGING PROCEDURE Task Description 1. Confirm that Pre-commissioning checks are completed for MCC and upstream PMCC Feeder(s) 2. Confirm that Relay settings are adopted as per recommendation for upstream PMCC Feeder(s), Bus Coupler and Bus PT relays if applicable 3. Ensure availability of Fire Extinguisher 4. Obtain clearance from working parties 5. Test & record final IR of Incomer Power cables. Confirm proper termination at both ends 6. Test & record final IR of MCC Bus 7. Confirm that all covers are closed on MCC and upstream PMCC 8. Ensure that all outgoing feeders of MCC are Isolated 9. Ensure that PTs and Auxiliary transformers of MCC are racked in, with all fuses intact 10. Ensure that MCC Incomers and Bus Coupler are Racked out / OFF 11. Rack in the upstream CB, if applicable 12. Note the bus voltage of upstream PMCC and confirm that it is within normal range (415V ± 10%) 13. Close the upstream PMCC Feeder, thereby charging the Power cable 14. Check the voltages at MCC Incomer PT voltmeter. Record PT secondary voltages in the table below. 15. Close the Incomer 1 ACB / SFU / Isolator, thereby charging Bus-1 of the MCC 16. Check the voltages at Bus-1 PT voltmeter. Record PT secondary voltages in the table below. Confirm the positive phase sequence from outgoing feeder. 17. Close the Bus Coupler ACB / SFU, thereby charging Bus-2 Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) Inc 1 Inc 2
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear 18. Check the voltages at Bus-2 PT voltmeter. Record PT secondary voltages in the table below. Confirm the positive phase sequence from outgoing feeder. 19. Phase out between the Bus-1 and Bus-2 (through outgoing feeders), and record. A proper phase match is essential. 20. Check proper functioning of control transformers for 110V and 230V, including changeover If both sources are available: 21. Open Bus Coupler ACB / SFU 22. Close the MCC Incomer 2 ACB / SFU / Isolator, thereby charging Bus-2 of the MCC 23. Check the voltages at Bus-2 PT voltmeter. Record PT secondary voltages in the table below. 24. Phase out between the secondary voltages of the Bus-1 and Bus-2 PTs, and record. A proper phase match indicates that the two sources are in phase. Voltage record:Configuration Vab Vbc Vca Va-earth Vb-earth Vc-earth Vn-earth Phase-out record Bus-1 PT Bus-2 PT Bus-1 and Bus-2 fed from same source Va Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT) Va Vb Inc-1 PT Inc-2 PT Bus-1 PT (fed from source-1 Bus-2 PT (fed from source-1) Bus-2 PT (fed from source-2
Bus-1 fed from source-1 and Bus-2 fed from source-2
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear Vc Va Vb Vc Va Vb Vc
Vb Vc
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
Signature (GKEL(O&M)) (Contractor) ( GKEL PROJECT)
Energy ltd.,
STATION: GKELUnit # - 1 350 MW Sub-critical SHEET
PLANT AREA : ELECTRICAL LT Switchgear
TESTING SCHEDULE: Procedure for commissioning of LT Switchgear
