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Explain two wattmeter method for measurement of 3 - phase power.
1 Answer
written 3.9 years ago by |
Let's consider, 2-wattmeter method to measure the power in a star connected balanced 3-phase load as shown in figure below-
From above connection diagram,
(a) Current through wattmeter W1, I1=IR
(b) Voltage across wattmeter W1, V1=VRB
(c) Current through wattmeter W2, I2=IY
(d) Voltage across wattmeter W2, V2=VYB
P=VIcosϕ.....(3)
Where, V is the voltage across the wattmeter
I is the current through wattmeter
ϕis the angle between V & I
W1=|V1||I1|cos(angle between V1 and I1)=|VRB||IR|cos(angle between VRB and IR)....(4)