Measurement of Power in Conjunction With Instrument Transformers
When the currents and voltages of the circuits to be measured are high then use of instrument transformers is made with watt meters just as with ammeters and voltmeters. The connection diagram of wattmeter, when used in conjunction with instrument transformers, for measurement of power is shown in fig.
k = cos Ø/(cosΘ cos (Ø-Θ+ß+ δ) for inductive loads
and k = cos Ø/ cos Θ (Ø+Θ+ß+δ) for capacitive laods
where β is phase angle of CT, δ is phase angle of PT, cos Ø is load power factor and θ is angle by which current in PC of wattmeter lags behind Vs due to inductance of PC.
True power, P = K × actual ratio of CT × actual ratio of PT × wattmeter reading.
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