A phase angle of –240º is the same as 120º and a phase angle of 240º phase is
the same as –120º. Therefore, the three terms in the sums within curly brackets in the pre-
ceding equation form balanced three-phase sets. Sum of a three-phase balanced set is zero
for all time instants. Therefore,
Thus, the total power delivered to the three-phase load is seen to be a constant.
If the power dissipated in the three branches of a balanced three-phase load acts on
the same physical system, then, a balanced three-phase source delivers active power to the
load with zero power pulsation. The double-frequency power pulsation in the case of a
single-phase AC ...
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