Interested to Buy Any Domain ? << Click Here >> for more details...
What are the possible causes of REF operation on a power
transformer
- 4 Answers
- 7495 Views
- I also Faced
- E-Mail Answers
Answer Posted / k.prakashchandra
All cts(Phases and neutral) are connected in parallel.If
there are unbalanced currents in phases, the resultant
current in REFR is zero as the difference is also measured
by NCT .If there is an earth fault inside the transformer
or between cts and bushings ,the fault current is sensed by
NCT only. Hence current balnce is lost in REFR resulting in
trip command by the relay
| Is This Answer Correct ? | 3 Yes | 0 No |
Post New Answer View All Answers
i have interview in Pepsi company what type of question will ask please send the question and answeer
Please tell me in DETAIL about the following 3 types of fuses or recommend me a good power system protection book or a website link ? 1.Dropout Fuse 2.Striker Fuse 3.Empulsive fuse (not sure if its impulsive or explosion fuse , sorry)
Work done in a free expansion process is
how to design step down 12 V, 1mA small transformer from 220 V AC? Because according to VI relation and power transfer it results bulky...
Can u Explain about the electronic trivector meter and the use of data converters in them?
give some advantages and disadvantages of combiniing the session, presentation, and application layer in the osi model into one single application layer in the internet model
Apparent power is expressed as V * I(Conjugate). Why not in V * I ?
How to Calculate Transformer Earthing Electrode Rod Size both Body and neutral Earthing ? Any Standard Formula? Please Suggted
What is meant by earthhing of a magnetic flow meter and when to use empty pipe detection?
How to do cable sizing calculation for 750 A Neutral Earthing resistor for 33kv. the 33kv cable going to swbd. is 630mm2 3 runs.
How to decide whether A / B / C / D curve type MCB should be used?
What do you mean by Stimulastion Test in Diesel Genarator / Why & when it's conducted ?
send me any model test paper of clerical post of state bank of india.......
What is the ratio of true power to apparent power in an ac circuit?
what is the current density of copper & alluminium.
