Answer / pillay

It is transformer oil dielectric breakdown voltage.
A sample of the tx oil is collected and tested with a
special tester. In the tester is a pair of electrode spaced
as per BS
spec. A TEST VOLTAGE IS APPLIED ACROSS THE ELECTRODES , and
this voltage is gradually increased until a breakdown
happens resulting in sparks across the electrode, immeadetly
the test voltage is stoped and the RMS voltage is
calculated.A few test is carried over and the mean voltage
is taken as the breakdown voltage of the sample oil under
test.

It is flash point of oil.The flash point is at what temp the
oil would self ignite. This depends on the quality and type
of oil.

What are the types of windings according to the construction?

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What is milivolt dop test in Busducts? What is its significance & procedure to do the test?

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which is better VCB or ACB and why?

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why frequency should be constant?

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On what principle electric motor works?

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I have a drawing of a wound rotor induction motor for a crane. This crane motor has 5 forward speeds & 5 reverse speed implemented of course with different amount of resistance for each speed setting selected. What has got me scratching around is the fact that 8 of the 10 speed selections switch in uneven (unbalanced) amounts of resistances on each of the 3 connections to the motor's rotor.Can this be possible? I would have assumed this would produce unbalanced rotor currents and therefore vibration in the motor. I would greatly appreciate anyone's comments on this. Many thanks, Confused.

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What is the formula to find out the kvar required to improve the powerfactor from .85 to .99 at 1500kw, 415v.

4 Answers   Trident,

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What is voltage 

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How DC to AC convert

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why earthing point in the 6amps/16amps socket bigger than the remaining (Phase & Neutral)points.

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Is it possible we are step down 11 kv to 230v ?

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63MVA,220KV/6.9KV Transformer LV side neutral is connected to Earth pit through NGR. Whether this earth pit required to connect with near by below grouding earth mat or it is to be kept separate?

0 Answers   GSECL, L&T,

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