Answer / Manish Ratan

In differential protection, the 40% and 80% slopes are used to compare currents on both sides of a circuit breaker. The 40% slope compares the largest positive deviation from the normal current flowing in either direction, while the 80% slope compares the largest negative deviation. These values are used to determine whether an unbalanced current is due to a fault or not.

Which power will flow first if we switch on a motor Active or Reactive? How?

4 Answers  

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I meggared my 2c*70 sq mm AL AR XLPE cable. its one end show 50 M ohm . is my cable is safe for laying. I have only one phase and neutral.

1 Answers  

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How to do cable earhing? whether by grounding Armour to ground or by running extra G.I wire along with cable? which one is preferred mostly amoung them? If the second one is more preferable how many GI wires to be run along with cable (1 or 2)?

0 Answers   HAL,

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why the motor is rated as kw& transformer as kva

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how to calulate short circuit current for the following: 1.cable connecting 11KV of 22KV/11KV transformer to 11Kv of 11KV/415V transformer 2.what cable size should i use.

1 Answers  

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what is the safety of voltage power transformer(2250KVA0

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If we have to find the inductance of a dc shunt motor then by giving dc supply or ac supply and what is the reason for it. (this example is from "to determine the transfer function of a dc shunt motor ")

1 Answers  

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why dont we use the same pylon to carry 400 kv plus 220kv and 33 kv ?

2 Answers   Focus, Focus Energy,

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Why mostly conductor made by 7 nos wire?

2 Answers  

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Do closed loop systems require manual input?

1 Answers   GE,

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What is the impedence of Transformer?

2 Answers  

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can we measure +,-.zero sequence current ....? if so how can ???

2 Answers   NLC,

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