What is the minimum setting in REF relay because i am
facing some problem whenever power resumes after power
failure my transformer is tripping because of REF trip. I
am using CSPC make numerical relay(DIP switches). Now
setting is 15 percentage. What is the reason for this
triping. I sm waiting for answer
Answers were Sorted based on User's Feedback
Answer / k.prakashchandra
Your setting is 15% of In.While charging ,Tr draws initial
magnetizing current 6 to 15 times the In. Any difference in
measurements by CT s at this current ,may exceed the set
current.Even 1% error in measurement at normal current
becomes 15% of In at initial charging current at 15 times
the In
Is This Answer Correct ? | 0 Yes | 1 No |
what is LSR?
how many power plants in andhra pradesh,how many types and there capacity
Comparision of Air break circuit breaker, SF6 Circuit breaker and vacuum circuit breaker.
What is percent age of scrap of wires as per IE Rule Clause No in wiring for House and Industrial wiring ?
why we use two slope(differential & restraining) in differential relay.but in busbar protection differential we are using only one slope?please explain
Which transformer is suitable for 220/11 kV, 60 MVA, distribution , Y-Y or D-Y or Y-D, give comparison for the same.
what is RFCT and Insulgard Relay & It's function?
our company have 750 kva oil transformer.still we have facing a problem that is when voltage is 11.5 kv coming from HT side then LT-side voltage is 420v or above at tape 1.please give me best solution to decrease the voltage.
can we run the home fan both clock and anticlockwise direction
if vcb make contact but output notreach give the reason?
What is the transformenr turns ratio.
WHAT IS SYNCHRONISING?