Answer Posted / venkatesh kulkarni
Used to limit the ground fault current.
If the Line voltage getting leakage or shorted with ground
then fault curretn will flow.
If it is High voltage system this fault current will be
very high (KAmps). So this much high value fault current
will demage the fault current sensing devices (relays).
This fault current will reach the transformer Neutral
through the Neutral earth pits.
By adding the NGR in between the Transformer neutral and
Neutral earth pit, resistance of the fault current path
getting increase.
we Know that, If resistance is more then the (fault) current
flow will be less.Then easy to sence. Normally resistance
will be 12 to 15 ohms depends upon the setting made at
relays.
| Is This Answer Correct ? | 6 Yes | 0 No |
Post New Answer View All Answers
what are pilot cells
IN 1000kva transformer where the oil and winding temperature sensors is connected
what is the disadvantages of common earthing for AC and DC equipment? (i am talking about inverter control room and inverter duty transformer earthing is common...?)
Define damping ratio.
where does 22kv line starts
A 400KVA transformer has 400 Hz frequency. If the frequency is changed to 50 Hz, then what will be the new KVA rating?
What does a Bode plot tell you?
1sq mm dc powr cable can carry how much dc currnt
when ID fan will immediately stop through VFD what exactly cause and problem the ID fan
how to calculate short circuit current for the busbar
How work of capacitor in dc supply...???
what is the difference between earth leakage and earth fault?
what is the difference between online & offline caliberation of KWH meters. Can Digital meters be caliberated
A car's starter motor draws a current of 100 A at 12,0 V when starting the engine. The mechanical power required to turn the engine is 960 W. At what rate is energy from the battery converted to non-mechanical forms of energy?
neutral earth resistance testing is it possible for transformer while in load condition
