Answer / sureshbabu

for the grid connected system the earthing value must be
below the limit of 1 ohm
for the individual connected system the earthing value must
be less than 5 ohms
this is the IEC standard for earthing and bonding

Answer / k.prakashchandra

In case of stations ,the maximum recommended values are
33KV-5 ohm, 66 KV -2, 110 to 400- 1.0 and generating station
-0.5.

Answer / simon

1 Ohm MAX in domestic purpose.

Answer / mohan babu bommu

there is no hard and fast rule in large sub stations 1ohm small substatioms 2ohms ither places up 6ohms permissable

Answer / sandip

UP TO 10 OHM IT IS OK

why we use two slope(differential & restraining) in differential relay.but in busbar protection differential we are using only one slope?please explain

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hopkinson's test

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why selected genration, transmission or any at 11kv, 132, 220, 220 or 440 voltage which is propotional to 11. why does not any for ex. 12 kv 13kv or any

2 Answers