Why GRR starts from 60% of motor speed why not less than 60%?

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i need of the bhel question papers along with answers and also give some website names for the downloading question (electrical and electronics engg question)please help me....

0 Answers  

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length of 4 core cable 95mm from substation LV VFD panel to Motor at field approximately 150 meter. Motor stop and power has been isolated from LV MCC ( Substation )to disconnect Motor for services. After Motor completed service propose to reinstall and reconnect Motor Cable, found earth cable sparkling during touching at metal / motor body. Inspect by clamp meter found earth cable have current flow AC 1-2amps and all earth cable at MCC LV also have current flow as same value. why it is happen?

2 Answers  

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how much Watt can we fully load a transformer

4 Answers  

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In a star-star connected h.t transformer why we use NGR on the secondary (l.t)side.

3 Answers   Star, TATA,

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What happens if the negative to earth voltage is greater than positive to earth voltage in the battery of substation?

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what is the purpose of using battery in dg sets, please specify in details.

2 Answers   Balco,

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Explain the purpose of inductor in an electric circuit?

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different between grounding & earthing?

23 Answers   L&T,

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Explain types soft starters?

7 Answers   Siemens, TCS,

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hi frienda We have 750kva cater pillet dg set we are fasing one diffrent proublam in dg we are start dg set after one mint applying load around 450a load but dg was run 3 Or 4 mints after 3 mints dg was shuding down automatic how to face this proublam pls tel any budy

1 Answers  

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what is difference between start imitation and start interlock for 3 phase motor protection ?

2 Answers   OPS,

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