Switchgear
Content
SWITCHGEAR 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. WHAT IS THE PROBLEM, IF A CIRCUIT BREAKER IS NOT CLOSING. IF AUTO TRIP IS OPERATED, CAN YOU CLOSE THE BREAKER. WHY YOU ARE SWITCHING OFF ARC PROTECTION MCB WHEN YOU ARE TAKING SHUTDOWN FOR LV BOARD. WHY IT IS NECESSARY TO ISOLATE FIRE FIGHTING WHEN YOU ARE TAKING SHUTDOWN FOR LV BOARD. HOW YOU GIVE CLEARANCE TO A SPARE FEEDER. HOW TO PUT BREAKER IN SERVICE / TEST POSITION. OPERATION OF ISOLATORS. LOAD TRANSFER IN 11KV DOUBLE BUSBAR SWITCHGEAR OPERATION. HOW TO CHECK THE CABLE FAULT / HV TEST OF TRANSFORMER CABLE. HOW TO DO MAINTENANCE OF TRANSFORMER FEEDER. HOW TO DO MAINT. OF BUSBAR. SINGLE LINE DIAGRAM FOR DBB (DOUBLE BUS BAR)SYSTEM. WHICH TYPE OF ARC PROTECTION DEVICES USED. HOW EARTHING OF SWITCHGEAR SYSTEM TO BE DONE. WHAT ARE OPTIONS USED FOR EARTHING THE SWITCHGEAR. WHAT ARE LOCATIONS ARC PROTECTION RELAY IS FIXED. ZONE OF PROTECTION AND TRIPPING SCHEME OF ARC PROTECTION RELAY. HIGH SPEED EARTH SWITCH OPERATION WITH DIAGRAM DIFFERENCE IN LOAD BREAK SWITCH, ISOLATOR AND CIRCUIT BREAKER. IF BREAKER IS UNDEFINED POSITION, FIRST STEP TO DO. LOAD BREAK SWICTH MAINTENANCE PROCEDURE. WHAT IS DOUBLE THROW ISOLATOR AND SINGLE THROW ISOLATOR. AFTER TAKING SHUTDOWN OF 11KV FEEDER, IF YOU SEE 5KV BY PHASING STICK IN THE CABLE SIDE, IS IT POSSIBLE TO CLOSE EARTH SWITCH IN CABLE.
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FEEDER SHUTDOWN PROCEDURE. WHY TR. FEEDER 132KV SIDE DOES NOT HAVE MW, MVAR METERS. BACK TO BACK BUSBAR ARRANGEMENT EXPLAIN. BBC MAKE
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WHAT IS SHUNT REACTOR AND WHERE IT IS USED. WHAT IS FAULT CURRENT. WHAT IS THE LIMITATION. IF WE CLOSE THE FEEDER ON DEAD FAULT, WHAT WILL HAPPEN IF ISOLATOR IS OPENED ON LOAD, WHAT WILL HAPPEN. WHAT IS CLOSING TIME AND OPENING TIME OF CIRCUIT BREAKER. HOW YOU WILL GIVE SWITCHGEAR AND PROTECTION CLEARANCE. WHAT WILL HAPPEN IF WE SWITCH OFF NEUTRAL CB OF NGR. IN 11KV SWITCHGEAR, WHICH IS OPERATED FIRST: BUS SECTION or BUS COUPLER. SCHEME FOR CONTROL CIRCUIT OF CB, ISOLATOR. SCHEME OF INTERLOCK FOR ISOLATOR, CIRCUIT BREAKER, EARTHING SWITCHES. WHAT IS DUTY CYCLE OF BREAKER. WHAT IS TRIP FREE OPERATION IN BREAKER BATTERY CHARGER AND BATTERY - TYPE, PROCEDURE FOR MAINT. WHAT IS BATTERY CAPACITY TEST EXPLAIN
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LIMIT FOR DEWPOINT AND %VOLUME IN SF6 GAS. IF BELOW, WHAT YOU WILL DO. WHAT IS GRID RESISTANCE VALUE. EARTH PIT RESISTANCE. IF IT IS HIGH WHAT YOU WILL DO. WHY THERE IS INTERLOCK IN INCOMER WITH BUS SECTION IN LV BOARD. HOW TO TAKE MAINTENANCE OF 6.6KV NEUTRAL BUSBAR IF WE TAKE ONE POWER TR. MAINTENANCE. WHAT IS THE INTERLOCK PROVIDED IN CABLE FEEDER WHILE EARTHING CABLE WHEN FAR END CB IS NOT OPENED. WHAT ARE CHECKS IN VCB; GCB; MOCB DURING MAINTENANCE WHICH TYPE OF V.T. IS USED IN 132KV GIS SWITCHGEAR (INDUCTIVE OR CAPACITIVE) WHAT TYPE OF MCB S ARE USED FOR V.T. SECONDARY CIRCUIT.
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20. 21. 22.
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24. 25.
FEEDER SHUTDOWN PROCEDURE. WHY TR. FEEDER 132KV SIDE DOES NOT HAVE MW, MVAR METERS. BACK TO BACK BUSBAR ARRANGEMENT EXPLAIN. BBC MAKE
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27. 28. 29.
WHAT IS SHUNT REACTOR AND WHERE IT IS USED. WHAT IS FAULT CURRENT. WHAT IS THE LIMITATION. IF WE CLOSE THE FEEDER ON DEAD FAULT, WHAT WILL HAPPEN IF ISOLATOR IS OPENED ON LOAD, WHAT WILL HAPPEN. WHAT IS CLOSING TIME AND OPENING TIME OF CIRCUIT BREAKER. HOW YOU WILL GIVE SWITCHGEAR AND PROTECTION CLEARANCE. WHAT WILL HAPPEN IF WE SWITCH OFF NEUTRAL CB OF NGR. IN 11KV SWITCHGEAR, WHICH IS OPERATED FIRST: BUS SECTION or BUS COUPLER. SCHEME FOR CONTROL CIRCUIT OF CB, ISOLATOR. SCHEME OF INTERLOCK FOR ISOLATOR, CIRCUIT BREAKER, EARTHING SWITCHES. WHAT IS DUTY CYCLE OF BREAKER. WHAT IS TRIP FREE OPERATION IN BREAKER BATTERY CHARGER AND BATTERY - TYPE, PROCEDURE FOR MAINT. WHAT IS BATTERY CAPACITY TEST EXPLAIN
30. 31.
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33. 34.
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37. 38. 39.
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LIMIT FOR DEWPOINT AND %VOLUME IN SF6 GAS. IF BELOW, WHAT YOU WILL DO. WHAT IS GRID RESISTANCE VALUE. EARTH PIT RESISTANCE. IF IT IS HIGH WHAT YOU WILL DO. WHY THERE IS INTERLOCK IN INCOMER WITH BUS SECTION IN LV BOARD. HOW TO TAKE MAINTENANCE OF 6.6KV NEUTRAL BUSBAR IF WE TAKE ONE POWER TR. MAINTENANCE. WHAT IS THE INTERLOCK PROVIDED IN CABLE FEEDER WHILE EARTHING CABLE WHEN FAR END CB IS NOT OPENED. WHAT ARE CHECKS IN VCB; GCB; MOCB DURING MAINTENANCE WHICH TYPE OF V.T. IS USED IN 132KV GIS SWITCHGEAR (INDUCTIVE OR CAPACITIVE) WHAT TYPE OF MCB S ARE USED FOR V.T. SECONDARY CIRCUIT.
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