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why do mostly prefer to generate and distribute electricity in 3 phase..not in 4 phase or 5 phase.??
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Answer Posted / guguloth shobhan
every signal has hormonics that are 1st,2nd,3rd,4th,5th..so on.even hormonics will be zero for sinusoidal signal becoz of it is odd function.So reamining are 1st,3rd,5th,7th,.....but higher order are not much effected that are 7th,9th...so on. SO remaining are 1st,3rd,5th.
5th order hormonic wiil be zero due to symmetrical(120 displacement).now have to eliminate 3rd hormonic ,it will be eliminate by using 3phase supply.1st hormonics is fundamental hormonic that is desirable one.
for above reason , we are using 3 phase supply.
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