Answer / jb

NGR means Neutral Grounding Resistance.it is used for limit the earth fault current.
generally the NGR earthing used upto the 11kv , Ac supply

Answer / jithendra

NGR or Neutral Grounding Resistors are used to limit the ground fault current to a safe value in the event of earth fault. A NGR limits the earth fault current to a value which will be sufficient to operate protective relays and prevent unwanted fault damage.

Answer / patni

Generator /Transformer neutral is grounded through resistor, called NGR (Neutral Grounding Resistor)which is used to limit the ground fault current to a safe value in the event of the earth fault. A NGR limits the earth fault current to a value which will be sufficient to operate protective relays and prevent equipment damage by excessive flow of fault current.

Answer / arvind kumar

what is mean by harmonics 1
how can we minimize the off load losses of a distribution transformer which is required to be energized 24x7 ?? capacity of the T/F is 1250 KVA and off load losses are around 2.0 KW.. can we use capacitor bank at the secondary of such a T/F to overcome off load losses? please elaborate briefly...thanks 2
In alternator generally we give DC voltage to field of alternator but field (excitor)produce Ac & converts into DC by rotating rectifier(RR ) then fed to rotor .my question is why we cannot give dc voltage directly to rotor instead of Excitor & RR ? 1
How to calculate cable sizing 5
Why the bypass and blocking diodes are used in solar modules? 1
If a 1.5V,3W torch light bulb is connected in series with a 15HP/11.19KW,230V single phase motor and the combination is connected against a 230V supply and switched on than what will happen keeping all other parameters as it should be A)the bulb will glow normally B)the bulb will not glow C)the bulb will glow with extra brightness D)the bulb will burn out and if a fuse is connected to the above circuit will something happen to the fuse and what about the single phase motor will it be affected? Please explain with derivation 4
what is the best way to start a 15 KW motor for pump star-delta or direct on line ? and from how many KW i must use direct on line ? 1
what is HVDC, what are advantages over conventional system? 1
ohms law is applicable for dc or ac current or for both??? explain it berifly?? 2
what is unbalanced rotating magnetic field? 1
what size of copper busbar use for 11kv 630A 3
what is the maximum demand how it is defined 1

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