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9
●Measuring 3-Phase 4-Wire (3
4W) Power Parameters:
In both un-balanced and balanced load cases, 3-Phase 4-Wire (3 4W) systems,
measure the phase-to-neutral powers kW1, kW2 and kW3 of each phase separately as
illustrated. System (total) power kWTotal is the summation of all three phase-to-neutral
powers. That is:
kWTotal = kW1 + kW2 + kW3 (for both un-balanced and balanced load cases)
In balanced load cases, 3-Phase 4-Wire (3 4W) systems, the system (total) power
parameters can be simplified to three times of any of the phase-to-neutral powers. That
is:
kWTotal = 3 x kW1
(for balanced load cases only)
kVATotal = 3 x kVA1
(for balanced load cases only)
kVARTotal = 3 x kVAR1
(for balanced load cases only)