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The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter mea…

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The current coil of a wattmeter is connected to the CT of R-phase. The potential coil is connected across Y and B phases. The wattmeter measures
  • AActive power in R phase
  • BActive power of Y phase
  • CReactive power of R phase
  • DPower proportional to 3 phase power if the load is balanced
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Wattmeter reading = VPC ICC cos (VPC ^ ICC)

A current coil of wattmeter is connected to the CT of R-phase. So, wattmeter takes the current flowing through the R phase.

Pressure coil is connected across the Y phase and B phase. So, wattmeter takes the voltage VYB

Now, the wattmeter reading is,

W = VYB IR cos (VYB ^ IR)

Let the load angle is ?, the angle between VYB and IR is (90 – ?)

⇒ W = VYB IR sin ? = reactive power of the R phase.