Answer / sanjeet kumar singh

Megger is used to check whether the insulation is ready for
bearing the nominal voltage at which the equipment is to
run. Since, a 6.6KV motor is to face the voltage of 6.6KV;
hence it is to be tested with 5KV megger. On the other hand,
if you measure the megger of 33KV transformer with 500V
megger, it means that you are giving the pressure of 500V
only to a system which is claiming to be sustain 33000V of
pressure. Hence, the test becomes meaningless, because you
are giving only 500V to a system which has to bear atleast
33000V. In addition, we should also know that basic meeger
voltage are: 500V, 2500V, 5000V. Above that you have to go
Hi-POT test.

Answer / praveena k

Slipring induction motor is a heavy motor that winding is heavy voltage carrying

Three phase power is measured with two wattmeeter for balance three phase load.the reading of one wattmeter is zero.we can conclude that the power factor of balance load is?

1 Answers  

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how i define power factor when some one ask me ,,,,,what is power factor ,,,,,pleas define it simple. (pleas dont use these worlds ,,the difrence bitween apparent power and actual power is power facter )

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I have 12MW gas engine based power plant its running parallel with grid. my problem is When cpp run in island mode(without geb) that time geb transformer power factor is 0.2 lagging. When cpp run with parallel that time power factor is 0.94 lagging So how can i maintain power factor ofgeb transformer in island mode 0.9 lagging?

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iam interesting to design the control panel for 3 phase pump motors by controling single phase switches.iam plan to use fuse,contactor & relay for motor protection .how can i select the voltage & amps rating for fuse,contactor & relay plz guide me .if anybody clarify my doubt means it will more helpful for my future .

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what is difference between ELCB, RCBO & MCB

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