Answer / subaharan

first check the transformer bushings and their condition,then
you meggering the transformer each phase to phase and phase to
earth.
power cable you check the high voltage test which is used for
measuring the leakage current,meggering and continuity
checking.
switchgear the same meggering,isolator checking,relay
testing(set various values of currents,voltages and set time
for tripping) make the fault and note the trip time.

why make protection 85% of winding?

1 Answers  

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How to calculate size of HT breaker with the help of Amp (current)? Please provide answers with examples.

0 Answers  

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how can I calculate charging current of cable/overhead conductor? what is roll of voltage in it ?

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Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient?

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how the reverse power relay acts..

2 Answers  

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Kindly give the brief explanations for checking 12.5 kvar 440V, 25 KVAR 440V, 12.5KVAR 690V, 25 KVAR 690V capacitors microfarad values. what is the microfarad values for the above four type of capacitors, and give the formula explanations briefly. I know F-50HZ, voltage, and capacitor.

1 Answers  

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What is making & breaking current ???

0 Answers   JLL,

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1.wat is the purpose (or)function of regulator? 2.wat is the purpose of stabiliser?

3 Answers  

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Are generator action and motor action relates to a particular machine only?

2 Answers  

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what is sevice settings for mccb?How can be it setted?

0 Answers   Bhel, Minda,

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why white color LED light is not possible?

1 Answers  

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what is meant by negative sequencing in power system.explain in detail

1 Answers  

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