Answer / k.prakashchandra

Neutral current is undesirable . If 3 phase appliances are predominant or single phase loads are balanced, . the neutral current will be small . Further in protection scheme, the EFR is normally set at 20 % of the rated current . Hence main neutral conductor may be of half the size of phase conductors to save money .

In electric motors, according to the no. of compartments, The no. of input's (pantagraph collector's) were increased, why?

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if 50hz transformer is required to be run on 50% frequency what needs to be done???????????

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Why need 3phase machine double earthing?

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1)we have 1000 cfm Blower,Dia-1Mtr,Velocity of air 94 m/s 2)We have Natural Air velocity 94m/s 3If i Put Wind Mill in natural air ,speed is 94m/s Then it will generate Assume 100kw 4)If i put same wind mill across the Blower,air speed is same 94m/s now the Question is Will it generate 100 kw?

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