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Electro Industries/GaugeTech
Doc #: E107-7-06-121
1-2
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Power Factor
(PF) is the ratio between real power and apparent power. Ideal power distribution
should have a PF of 1. This condition can be met only if no reactive power loads exist. In real life
applications, many loads are inductive loads. Corrective capacitors are installed to correct poor Power
Factor.
1.2: Three-Phase Power Systems
1.2: Three-Phase Power Systems
A three-phase system delivers higher levels of power for industrial and commercial applications; the
three phases correspond to three potential lines. A 120° phase shift exists between the three potential
lines. A typical three-phase configuration has either a Delta connection or a Wye connection. In a three
phase system, the voltage levels between the phases and the neutral are uniform and defined by:
Real Power (W)
B
A
N
B
C
A
C
Delta
Wye
Figure 1.2: Relationships Between Apparent, Real and Reactive Power
Figure 1.3: Three Phase Power Systems
2
2
VAR
W
W
VA
W
PF
+
=
=
3
3
3
ac
bc
ab
cn
bn
an
E
E
E
E
E
E
=
=
=
=
=
PF
=
Θ
Summary of Contents for Nexus 1250
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