The three-phase complex power delivered by a three-phase source is given by
where
θ
is the angle by which the current phasor delivered by a phase-source lags behind
its voltage phasor. This relationship is independent of whether the source is Y-connected or
Δ-connected. It should be noted that
θ
is not the angle between line voltage phasor and
line current phasor.
Electrical Power Engineering adopts a convention to specify a three-phase source
by specifying its line-to-line voltage in r.m.s value. We follow this convention unless
stated otherwise in the remaining portions of this chapter. Thus a 400 V, 50 ...
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