An unbalanced three-phase circuit is one that contains at least one source or load that does
not possess three-phase symmetry. A source with the three source-function magnitudes
unequal and/or the successive phase displacements different from 120º can make a circuit
unbalanced. Similarly, a three-phase load with unequal phase impedance values can make
a circuit unbalanced.
The single-phase equivalent circuit technique of analysis doesnot work for
unbalanced three-phase circuits. General circuit analysis techniques like mesh analysis or
nodal analysis will have to be employed for analysing such circuits. ...
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