what is neutral ground resistance relay? how it is helpful
in protecting system?
Answers were Sorted based on User's Feedback
Answer / ranjan prasad
Normally NGR is being connected with the neutral of
transformers or Generators to limit the the fault current.
This NGR basically gives the out put in terms of voltage
during the fault condition (like Earth Fault). To sens the
voltage during fault condition, isolation transformer is
connected across NGR for voltage feed back. This v f/b goes
to the relay to operate in case of earth fault depending
upon the setting done at relay.
Is This Answer Correct ? | 11 Yes | 0 No |
Answer / aamod tripathi
NEUTRAL GROUND RESISTANCE RELAY IS A RELAY WHICH WILL
OPERATE UNDER AN EARTH FAULT. AND WILL GET ACTIVATED IN
CASE OF AN EARTH FAULT ONLY TO ACTIVATE THE BREAKER IN
ORDER TO TRIP THE CIRCUIT.
Is This Answer Correct ? | 6 Yes | 0 No |
Answer / biswajit sahoo
THIS IS BASICALLY REF TYPE RELAY. iT WORKS ON PRINCIPLE OF
DIFFERENCE IN NEUTRAL CURRENT IE TRANSFORMER END AND
CONSUMER FEEDER END
Is This Answer Correct ? | 2 Yes | 2 No |
Answer / angela tong
NGR is neutral ground resistance which is inserted between
neutral and ground to operate during ground fault happens.
It could prevent generator or transformer from overvoltage
or arc flash grounding transient overvoltage and clear the
fault up.
Is This Answer Correct ? | 0 Yes | 0 No |
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