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What do we understand by a balanced and un balanced three phase load?

What do we understand by a balanced and un balanced three phase load?
 

Grade:12th pass

1 Answers

Shobhit Varshney IIT Roorkee
askIITians Faculty 33 Points
6 years ago
Hi,

Abalanced three-phase loadis one in which each of the three loads is identical in all respects (magnitude and phase). The three line currents must not all be 'reasonably close', they must beidentical-i.e. the same value and phase relationship.
An important property of a three-phase balanced system is that the phasor sum of the three linear phasevoltagesis zero, and the phasor sum of the three line or phase currents is zero. Whenthe three load impedances are notequalto one another, the phasor sums and the neutral current) are not zero, and the load is, therefore, unbalanced.

thanks

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