To prevent the mal operation of a differentially connected relay while energizing a transformer, the relay restraining coil is baised with (a)second harmonic current (b)fifth harmonic current (c)third harmonic current (d)seventh harmonic current

2 Answers  

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my 10 hp submersible pump is tripping when connected through ELCB.I have checked the megger value of the coil's with body.It was found to be 0.2mega ohm.that is leakage is there.But when connected to mccb it is not tripping.no leakage current in the motor.Is it safe to connect to mccb? what are the problem's will arise if future?also tell me in ELCB no neutral is connected to motor.than how ELCB was working?

1 Answers  

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Genreally distribution transformers are having Star/delta connections to provide phase and neutral to the consumers. Is the neutral of the star conncted secondary grounded in these transformers?

1 Answers  

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can u give me a brief idea about power line carrier communication ??

0 Answers  

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hello, I need to know exactly what happen in the motor while it is connected to the (star/delta) starter, mechanical and electrical. Thaks for answering

3 Answers  

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What is Scheme Test of High Voltage Switchgear. Which tests it includes.

0 Answers   Siemens,

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What is C check in a diesel generator and what are parts and what has to be done during the C check

4 Answers  

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how to determine motor size for a fan application?

0 Answers   EDC,

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how to amps calculate from 1KVA?

11 Answers  

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How would you supply power to a village which is very far from a sub-station and has only a 11kV line running near by?

3 Answers  

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why ac wave is sinusoidal not square or triangular wave what will be reason

1 Answers   ACPL,

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Where is 2 phase supply used commercially?

3 Answers   NTPC,

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