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Question
why overcurrent fault occurs in power system.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Overcurrent fault mainly occurs due to the greater demand
of power either by loads or short circuit.
 
Is This Answer Correct ?    10 Yes 0 No
Karthik
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
What happen if two protection core (3p) of VT in LAVT are 11kv/root3, 110v/root3 and one protection core (3p) is 11kv/root3, 110v/3   1
what is the relationship between current&voltage in practical purpose ? Indorama 1
what the purpose of transmited high voltage in over head lines NCC 3
What are the different types of VVVF Drive ?   2
single phase for 230 then why three phase are 440 volt   3
what is the effect of constant power factor to the voltage regulation   1
what is elevation lamp?where its used? Essar 2
Wtat is vaccum currcuit breaker.define with cause of used.and where be use it Devise .   1
Which is the best between SCADA & PLCC & Why ?   2
Why do we choose 33kV transmission for industrial purpose and 11Kv for township?   1
SWITCHGEAR 1. WHAT IS THE PROBLEM, IF A CIRCUIT BREAKER IS NOT CLOSING. 2. IF AUTO TRIP IS OPERATED, CAN YOU CLOSE THE BREAKER. 3. WHY YOU ARE SWITCHING OFF ARC PROTECTION MCB WHEN YOU ARE TAKING SHUTDOWN FOR LV BOARD. 4. WHY IT IS NECESSARY TO ISOLATE FIRE FIGHTING WHEN YOU ARE TAKING SHUTDOWN FOR LV BOARD. 5. HOW YOU GIVE CLEARANCE TO A SPARE FEEDER. 6. HOW TO PUT BREAKER IN SERVICE / TEST POSITION. 7. OPERATION OF ISOLATORS. 8. LOAD TRANSFER IN 11KV DOUBLE BUSBAR SWITCHGEAR - OPERATION. 9. HOW TO CHECK THE CABLE FAULT / HV TEST OF TRANSFORMER CABLE. 10. HOW TO DO MAINTENANCE OF TRANSFORMER FEEDER. 11. HOW TO DO MAINT. OF BUSBAR. 12. SINGLE LINE DIAGRAM FOR DBB (DOUBLE BUS BAR)SYSTEM. 13. WHICH TYPE OF ARC PROTECTION DEVICES USED. 14. HOW EARTHING OF SWITCHGEAR SYSTEM TO BE DONE. 15. WHAT ARE OPTIONS USED FOR EARTHING THE SWITCHGEAR. 16. WHAT ARE LOCATIONS ARC PROTECTION RELAY IS FIXED. 17. ZONE OF PROTECTION AND TRIPPING SCHEME OF ARC PROTECTION RELAY. 18. HIGH SPEED EARTH SWITCH OPERATION WITH DIAGRAM 19. DIFFERENCE IN LOAD BREAK SWITCH, ISOLATOR AND CIRCUIT BREAKER. Swgr Page 1 of 4 20. IF BREAKER IS UNDEFINED POSITION, FIRST STEP TO DO. 21. LOAD BREAK SWICTH MAINTENANCE PROCEDURE. 22. WHAT IS DOUBLE THROW ISOLATOR AND SINGLE THROW ISOLATOR. 23. 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. 24. FEEDER SHUTDOWN PROCEDURE. 25. WHY TR. FEEDER 132KV SIDE DOES NOT HAVE MW, MVAR METERS. 26. BACK TO BACK BUSBAR ARRANGEMENT BBC MAKE EXPLAIN. 27. WHAT IS SHUNT REACTOR AND WHERE IT IS USED. 28. WHAT IS FAULT CURRENT. WHAT IS THE LIMITATION. 29. IF WE CLOSE THE FEEDER ON DEAD FAULT, WHAT WILL HAPPEN 30. IF ISOLATOR IS OPENED ON LOAD, WHAT WILL HAPPEN. 31. WHAT IS CLOSING TIME AND OPENING TIME OF CIRCUIT BREAKER. 32. HOW YOU WILL GIVE SWITCHGEAR AND PROTECTION CLEARANCE. Swgr Page 2 of 4 33. WHAT WILL HAPPEN IF WE SWITCH OFF NEUTRAL CB OF NGR. 34. IN 11KV SWITCHGEAR, WHICH IS OPERATED FIRST: BUS SECTION or BUS COUPLER. 35. SCHEME FOR CONTROL CIRCUIT OF CB, ISOLATOR. 36. SCHEME OF INTERLOCK FOR ISOLATOR, CIRCUIT BREAKER, EARTHING SWITCHES. 37. WHAT IS DUTY CYCLE OF BREAKER. 38. WHAT IS TRIP FREE OPERATION IN BREAKER 39. BATTERY CHARGER AND BATTERY - TYPE, PROCEDURE FOR MAINT. 40. WHAT IS BATTERY CAPACITY TEST EXPLAIN 41. LIMIT FOR DEWPOINT AND %VOLUME IN SF6 GAS. IF BELOW, WHAT YOU WILL DO. 42. WHAT IS GRID RESISTANCE VALUE. EARTH PIT RESISTANCE. IF IT IS HIGH WHAT YOU WILL DO. 43. WHY THERE IS INTERLOCK IN INCOMER WITH BUS SECTION IN LV BOARD. 44. HOW TO TAKE MAINTENANCE OF 6.6KV NEUTRAL BUSBAR IF WE TAKE ONE POWER TR. MAINTENANCE. Swgr Page 3 of 4 45. WHAT IS THE INTERLOCK PROVIDED IN CABLE FEEDER WHILE EARTHING CABLE WHEN FAR END CB IS NOT OPENED. 46. WHAT ARE CHECKS IN VCB; GCB; MOCB DURING MAINTENANCE 47. WHICH TYPE OF V.T. IS USED IN 132KV GIS SWITCHGEAR (INDUCTIVE OR CAPACITIVE) 48. WHAT TYPE OF MCBS ARE USED FOR V.T. SECONDARY CIRCUIT. KSEB 1
What is maximum demand and contract demand?   2
 
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