Answer / har

Power factor is the ratio of the real power that is used to do work and the apparent power that is supplied to the circuit.

Answer / d.p.

it is the cosine of the angle between the phase voltage and
phase currentfor a given load.

Answer / shobana

p.f is the load angle between the voltage and current.

What is the comparison between 30mA DP RCCB and 100mA DP RCCB and can replace it against 63A MCB

0 Answers  

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What is the different between Insulator & Di-electrict?

2 Answers  

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How many energy meters can be connected on a 15VA Voltage transformer. please send a calculation sheet.

0 Answers  

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i alternator which of genarator used for excitor the what is reason?

3 Answers  

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One of our gas turbine generator unit "1st stage rotor ground fault" alarm was occured several times. we tried to measure some voltage vulue ground fault protection relay (UNS3020a made by ABB and we measured the value of: Ground: 0.9VDC 5V: 5.8VDC 24V: 23VDC u+: 300 – 350mVAC Rf1: 17.5mVAC Rf2: 17.6mVAC The unit still running and the alarm was reset. As of 6pm yesterday and unitl now no alarm happened again. I our protection relay was defective?

1 Answers  

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An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?

0 Answers   HAL,

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Why we use ups battery and dsdb battery in thermal power plant

0 Answers   MDeC,

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how to select earthing conductor size of amy motor/panel etc.

1 Answers   Sony, VBB,

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for distribution line ratio of x/r 1.<0.1 2.>10 3.>1 4.<0.01

3 Answers   HAL, HPPSC,

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1. what is the meaning of bus? 2. what is the dc transformer? How it work 3.what is the function of the serge absorber? 4.How the CT and PT rating calculate/

1 Answers  

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why zero sequence impedance measurement is not applicable for single phase GT

0 Answers  

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Why reverse relay used

2 Answers   cpgn,

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