•A set of three sinusoidal quantities, all at the same frequency,
with equal peak (and hence equal r.m.s) values and shifted
successively by 120º in phase is defined as a Balanced Three-
Phase Quantity. Therefore, if x
1
(t), x
2
(t) and x
3
(t) is a
three-phase set, then,
x
1
(t)X
m
cos
ω
t, x
2
(t)X
m
cos(
ω
t– 120º) and x
3
(t)
X
m
cos(
ω
t 120º) or
x
1
(t)X
m
cos
ω
t, x
2
(t)X
m
cos(
ω
t120º) and x
3
(t)
X
m
cos(
ω
t – 120º)
and x
1
(t) x
2
(t) x
3
(t) 0 for all t.
If the peak values are unequal and/or successive phase shifts
are different from 120º, the set will be called an Unbalanced
Three-Phase Quantity. A three-phase source is specified by
specifying ...
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