Answer / kj

Three phase supply is the least number of phases that will
produce a rotating magnetic filed. This allows 3 phase
induction motors to start without special methods as with
single phase.
Extra phases have been used at times but it increases the
costs of all the power lines.
Where 3 phase can be 3 or 4 wire, 5 phase would be 5 or 6
wire and 7 phase would be 7 or 8 wire.

Answer / kumar

for single percentage is less than the 3 phase % of power improvement 57% after increasing 5 ph, 7 ph %power is increased only 7% that's why we use 3 ph

What is the control action?

0 Answers  

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i have 2 motor of same rating. on no load condition one motor take 1.6A but other motor is taking 4.8A. what is the reason of this. please explain with proof.

8 Answers   Ambuja, UltraTech,

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Define the three phase formula fuse.

0 Answers   ABC, Gayatri, UPCL,

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why 3 phase is converted into 2 phase using electronics circuit why not 2 phases are diresctly putted from the 3 phase transformer??

0 Answers   Descon,

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UG cable sizes were specified in sqmm. But practically its not coming to mesure. What's the reason for that? And how they specify the size of the cable?

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In CTs tan delta point should be earthed , what is the reason behind it?

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help!!!! i bought a new house 2 yrs ago,ive just had 2 new lights fitted,when i boil the kettle,maybe 2 times in succession the safety light switch trips out,it dosnt do it straight away but it seems to do it when the kettle boils!!!!! sounds very odd to me

2 Answers  

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WHY THAT THREE COLORS CHOOSEN IN 3 PHASE? WHAT IS MEAN BY RYB?

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What is meant by turbo alternators?

0 Answers  

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What is CCM in Electrical ? where can we use this material?

0 Answers  

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why is using sensor?what is differece between photoelectric and proxmitty?

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Is it posible to instal one more SMDB from the existing SMDB and is it practical.

0 Answers   CGI,

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