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Answer / madhu
the neutral grounding transformer is star connected on the
primary and has an open delta on it's secondary.Open Delta
has two terminals.A resistor is conected across these two
terminals. whenever a fault occurs, an emf will be induced
in the open delta and there will be a voltage drop in the
resistor connected. this voltage drop will be sensed by the
potential transformer connected across this resistor. at
the secondary of the potential transformer we have the
neutral displacement relay which will give a trip signal or
an alarm whenever its settings exceed a particular value.
|Is This Answer Correct ?||46 Yes||4 No|
Answer / gunasekaran
at balance condition voltage appear across the open delta
connection is zero at fault candition no longer zero.
so we r using this open delta connection for resudial over
|Is This Answer Correct ?||23 Yes||0 No|
Answer / k.prakashchandra
This relay is used for stator earth fault protection for
generators.The vector sum of three phases in all corners of
delta connected PT secondaries is zero.One of the corners is
taken through a voltage relay.Operation is as above.
|Is This Answer Correct ?||9 Yes||1 No|
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