Answer / k.prakashchandra

PI means 'polarisation index'.It is the ratio of megger
values at 10 th minute and that at first minute.This value
should be more than 1 and more than 1.5 is preferred.For
this motorised megger is required.For appx value, if you do
not have such megger ,values after 60 seconds and 10
seconds may also be considered.

What is a compensator?

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hello if any one have papers vof hpcl or sail, plz send me

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i have a 1500kVA transformer what is the kWH meter i need to use?

0 Answers   HP, L&T, Mohammed Harasani Architects,

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What is precision of a measurement?

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How do you protect your appliances from harm in case of neutral failure in a three phase power supply set up.

4 Answers  

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how to calculate the powerfactor in induction motor having name plate details? for example 1 h.p motor 1.86 A 415 V

6 Answers  

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When the relative speed between the magnetic fields of stator and rotor does is zero under steady state operation?

0 Answers   HPCL,

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hi frnds can any one help me ? plz send me placement paper of hpcl of Electrical streem .... plz send ....its urgent . The hpcl test is on 17th feb.

1 Answers  

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for testing busbar (33kv) hi-pot .whether we can apply DC r not.and what is the test volt for that .explain

4 Answers   WGPSN,

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what is the difference between OSR and BUCHHOLZ relay of transformer?

1 Answers   Bhushan Power Steel,

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My system is 22kv/3.3kv transformer. client is asking to use NGR, but as we have dedicated Neutral Earthing systems which has a value less than 1 Ohm. So i want solid comparision. Why i should not use NGR as my system is already protected.Can any one help me to get out of this.how should i reply on basis of some great comparision and calculations. Please help

2 Answers   Ariel,

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why the rotor current becomes in steady state during high slip region? please verify with equations.

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