Answer / lekshmi

kW = kVA * power factor

why for transformer protection we protect tranformer from 3rd hormonics and 5th hormonics and what is the reason of generating these horminics in electrical system?

2 Answers   Essar, LG, OPS,

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In a circuit the power factor was leading what will happen?

2 Answers  

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What are RMU yard Safety Operating Procedures

2 Answers  

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What are the types of earthing? Explain dagramatically.

3 Answers   Siemens,

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how can we change the supply voltage?

4 Answers   Areva,

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LT, CC and LMU installed at both the outgoing circuits of 132 kv double ckt transmissio what its means ? and what are there use ?

1 Answers  

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what is wave trap? please explain the working and principle

4 Answers  

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send me the upsc conventional papers of 2006

1 Answers   Juniper Networks, Siemens,

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We have 11kV/110V three phase indoor potential transformer in 66/11kV Sub-station, where the failure of PT is frequently happening and the rating of the PT is 0.2 class accuracy, with primary star and seconday (two cores) star connected. Some experts has suggested to not to connect the PT Primary neutral to the ground because when transformer neutal NCT connection is loose; the faulty current will flow through the PT primary neutral, resulting into failure of PT. My question is: Is it necessary to remove the primary neutral connection of the PT from ground? if not, what would be the reason for failure of PT. Please guide me.

2 Answers   KPTCL,

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In dc motor starter there is less voltage required for holding contactor that's may why it is called no volt coil. but in ac starter why holding contactor is called no volt coil.

2 Answers   JSW,

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Briefly describe means used by electricity suppliers to influence the flow of active and reactive power in power networks (one for each type)?

0 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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