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Two wattmeter method is used for measurement of power in a balanced three-phase load supplied from a balanced three-phase system. If one of the wattmeters reads half of the other (both positive), then the power factor of the load is
- 0.532
- 0.632
- 0.707
- 0.866
Correct answer: 0.866
Solution
In a balanced three-phase system, when one wattmeter reads half of the other, it indicates a specific relationship between the active power and the reactive power, leading to a power factor of 0.866, which corresponds to a cosine of 30 degrees.
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