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In the case of power measur ement by t wo wattmeter method in a balanced 3-phase system with a pure inductive load
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- both the wattmeters will indicates the same value but with opposite signs
- both the wattmeter will indicate zero
- both the wattmeter will indicate the same value with same sign
- one wattmeter will indicate zero and the other will indicate some non-zero value
Correct Option: A
Two wattmeter readings are,
W1 = VL IL cos (30 – φ)
= VL IL cos (30 – 90°) = VL IL cos 60°
W2 = VL IL cos (30 + φ)
= VL IL cos 120° = – VL IL cos 60°
