we have amp, voltage, kw, length detail then how to calculte copper & alluminium size of conductor of 3-phase induction motor

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In all electric motors, fans are provided to dissipate heat. How it dissipate the heat? By absorbing atmospheric air or by exhausting the heated air generated while running?

2 Answers   Ford,

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in 1-phase 230v,how in 3-phase 440v. in each phase in between 230v.

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why the CT ratio secondary is always divided by 5 for eg( 75/5,80/5,50/5)

6 Answers  

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What is an 86-P or an 86-A trip

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Why the power factor of the alternator in power plant is kept .8 lagging. Can't we maintain it at 1.

3 Answers  

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there is a power transformer 66/11kV in delta-delta connection has 5 feeder coming out from the secondary side. One of the feeder in it normally loaded (loaded than other feeder)and this feeder usually trips with double OCR causing the bank transformer to trip. Now if the load of this feeder is put on other transformer then that no problems occurs on that transformer or the load. However normally all the test(IR, PI, short ckt, open ckt,grounding test and other ) has been conducted for this but evertything transformer..... I am not geting what is the actual problem...

2 Answers  

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why we pefer the salient pole for synchronous motor ?

2 Answers  

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Explain the advantages of the wheatstone bridge method of measuring resistance?

7 Answers  

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how to write program by ladder logic in case of PLC operation

3 Answers   Gridco, Sofcon,

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Mention what are the types of semi-conductors?

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the site measured knee point voltage of protection class CTs should be greater than rated knee point voltage? what about meetering class CTs. Should it be below the rated knee point voltage?

0 Answers  

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