what is neutral grounding? why is it required? what is
neutral grounding resistor and how is its value calculated??
- 11 Answers
- 62250 Views
- NTPC, ONGC, I also Faced
- E-Mail Answers
Answer Posted / minu
@ Pankaj:
"The reason of solid grounding in LV system is that the
amount of earth fault current is very less e.g. for a
single phase to earth fault in a 415V 3 phase system, the
earth fault current is only 240A (considering earthing
resistance 1 Ohm). Whereas in 11kV system, the amount of
fault current will be 6351A. Hence resistance/impedance is
added to reduce the current to a safe value e.g. a 1250 Ohm
resistance in 11kV system limits the fault current to 5A"
i would like to differ in this point of yours. the LG fault
current in a system is never very less. it usually amounts
almost equal to the phase fault current or even more. I can
say this coz i have conducted short circuit studies for many
industrial plants where the LV system is solidly grounded.
| Is This Answer Correct ? | 11 Yes | 6 No |
Post New Answer View All Answers
What will happened if the neutral of the (star connected secondry) Xformer disconnected? (if its Above KVA rated one)
what the function breaker failure scheme, how is it operated
why is control bus bi-directional?
10 Mtr Hight of Lighting Arrestar how much area coverd??
how to calculate magnetic force genrated by a coil ?
What type of pipe material G.I or M.S is used for sprinkler system?
What is the difference between single core 2 wire and single core 3 wire system? Which application we are using this? and for What purpose we are using this?
why power factor is important?
What are the necessary components of the feedback control system?
There are Two questions about Steam Turbine Generator... What is HRSG bypass of LP, HP used for in power generation? In particualar, in the event that fault of HP bypass, there would be STG TRIP in operation but none on the LP bypass fault...what's the reason ?
How could I get a certificate of competency as Electrical Supervisor? I have completed By BTech in Electrical this year(2012) for VJTI Mumbai Maharashtra. Is it compulsory to be produced while joining?
why high speed tripping relay is used in protection circuit why not normal relay
How do I calculate a WTI CT ofa 1250kVA 6600/400V transformer
Which motor connection is preferable star-delta or delta-star?
what is LSR?
