Vector Sum Three Phase Current:
Vector sum is nothing but a calculating total current magnitude as well as phasor. i.e. consider three phase current magnitude and its phasor angle Ia ∠0°, Ib ∠120°, and Ic ∠240°. Here, for calculating vector sum of these current we should effectively consider magnitude as well as phasor quantity of the currents.
Here the vector sum of the current is equal to zero means, the summation of these three quantity should come zero. It is also called balanced load condition. In transformer protection or generator protection We use them. The same phenomenon is used for voltage also. To be balanced three phase system, the vector sum of the all phase voltage must be zero.
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