When and where resistance earthing is used ? How to calculate the time constant for earth fault

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On what basis do you decide the ONAN (Oil Natural air natural) or Dry type transformer for a project?

0 Answers   Semac,

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my UPS suddenly goes off and all panel light also blow off.This happens even main electric supply is not interrupted.After some time it automatically starts functioning normally.Batteries are new.

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How size of Earth Strip is determined for a particular Fault current.

1 Answers  

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can we amplify dc signals.how can it be done

4 Answers  

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What are the precautions to be taken before working on a cable?

1 Answers   Alfanar,

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If the 11 KV supply is fail. what will happened with it's breaker if it is supplay to the 11KV motor?

3 Answers  

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what are effects of harmonics in the three phase a.c power system ?

2 Answers   AIIMS,

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to improve the existing power factor whether capacitors have to be added in series or parallel.and why

3 Answers  

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How core saturation effects the secondary voltage (whats the theory) of a current transformer in service?

1 Answers  

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why link is provided in neutral of an ac circuit and fuse in phase of ac circuit?

4 Answers  

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is IS says that neutral should be brought to switch box. and this one is a recomended practice

0 Answers   Sterling Wilson,

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