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16.12.2.
3 Phase 3 Wire System
In the electrical systems distributed without neutral, the phase voltages and the power
factors and phase cos ϕ lose importance. Only the phase to phase voltages, the phase
currents and the total powers remain defined.
Phase 1
Phase 2
Phase 3
In this case the potential of one of the three phases (for example, phase 2) is taken on as
reference potential. The total values of the active, reactive and apparent power are
expressed as sum of the indications of the couples of Watt meters, VAR meters and VA
meters.
W 1-2
W 3-2
=
+
P
W
W
−
−
TOT
1
2
3
2
=
+
Q
VAR
VAR
−
TOT
1
2
(
=
+
S
W
W
−
−
TOT
1
2
3
Page 127 of 131
VAR 1-2
VAR 3-2
−
3
2
) (
+
+
2
VAR
VAR
−
2
1
2
3
VR2250
Three-phase
equipment
)
2
−
2
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