Answer Posted / s.m imran alam
A reverse power relay using semiconductor components is
provided to sense the phase relationship between current
and voltage in an electric circuit and to trip a circuit
breaker controlling that circuit in the event of reverse
power conditions. The reverse power relay comprises an
amplifier and current multivibrator circuit, an amplifier
and potential multivibrator circuit, a comparator circuit,
and a timing and output circuit. Current and voltage
condition signals from the two multivibrator circuit are
compared in the comparator circuit and, if a reverse power
condition exists, an output signal from the timing and
output circuit operates a trip coil which trips the circuit
breaker. The reverse power relay is powered from the same
power supply as a known type of overcurrent trip device.
| Is This Answer Correct ? | 24 Yes | 21 No |
Post New Answer View All Answers
what is interpose? where it is used and why it is used?
What is EMC filter in VVVF Drive ?
Explain about technical and non technical losses in distribution system?
we can run 2phase as 3phase .what will be the differnce with respect to phase angle, power, current between the two modes
the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?
What is gain margin?
hi guys please tell me the procedure for mesuring the coil resistance of 3ph induction motor?
How can we find out LT UG cable fault (size,from-4*25mm sqr to 4*300mm sqr)? How mani types UG cable faults?
how to calculate IR value of 33KV cable ??
can you any one give exact mathematical relation between AC current and DC current?
How can two 3 phase transformers of same KVA and Voltage be connected in parallel?
what happen if drive input fail momentry at 48.5 HZ frequency?
new 90kw motor installed so how I purchased cable ,fuse,etc please give me technic for cable selected why always capacitor delta connection
234 MVA Generator 3 phase Short circuit current Values required? Gen set Rating-234 MVA, Gen Voltage-18kv, PF;0.8, Xdv:23.5 %, Transformer Rating-18/380KV, 680MVA,Yndd1 two winding, Step up TR, ZT:35.50 %,X/R 4.33 Gen CB Position, CB open ,Disconnected open, Generator Running Voltage 18 Kv, Bi mistakes generator side earth switch Closed during that time short circuit current level in 3 Phase required, and how to test on site 234MVA Generator Short circuit current,
how many synchronous motor are there in any power plant
