How to calculate per unit impedance of transformer?

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why we do 2 types of earthing on tranformer ie:body earthing & nutral earthing , what is function. i am going to instal a 5oo kva tranformer & 380 kva DG set what should the earthing value

8 Answers   Altrion Technologies,

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What descriptive information does the NEC require to be marked on all conductors?

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what is blocking diode and what is the use of it in tne control circuit.Pls Explain it.

1 Answers  

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What are stable systems?

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Why do you use an isolator on both sides of the circuit breaker? ( shortly answer)

2 Answers  

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How Kneepoint voltage of CT practically related when CT in service. ie Knp is above 670 what exactly means

0 Answers   ABC,

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what is numerical relay explain its operation

2 Answers   ABB,

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I had finished D.E.E.E at 2004,I wish to take C license.I am working pvt company HT supply but my professional certificate was missing.I have diploma & course completed certificate.without professinel may I got c license?.pls guide me.

1 Answers   OEG,

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What will happen if the d.c. Shunt motor opened accidentally running on no-load has its shunt field winding?

0 Answers  

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how can we avoid magnetostriction in transformer?describe the suitable methods.

3 Answers   Bhel,

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during installation time of transformer and alternator which points we have to observed?

0 Answers  

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