How open delta used for protection?
Answers were Sorted based on User's Feedback
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
voltage protection.
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 |
Compare jfet’s and mosfet’s.
12.5 tons a/c is their how much kva generator can recommend to the customer.
WHY TRANSFORMERS ARE RATED IN 11KV 22KV 33KV Instead off 10kv 20kv 30kv
what is the power ratio between power in star and delta circuit?
The error in a single phase energy meter where pressure coil lags behind applied voltage by 88 degrees and pf is 1) upf 2).5lag
Cb closed condition if there is a tcs fail whether cb will trip or not
How the electric train gets the supply of electricity? What is the return path of the current?
If single phase supply is 220v. then why three phase supply is 660?
Is it possible to make a 5P10/ CT Ratio 50/1A Burden 5VA
If we connect a motor and generator together (I mean that the generator gives the motor electricity and the motor gives the generator movement) regardless the losses. Will the generator still generate and the motor still move?
HOW TO CALCULATE HV TEST VOLTAGE FOR ELECTRICAL EQPT.
why the weight of oil in transformer is specified (on the nameplate) in litres as well as kilo grams?