Electrical Engineering ⇒ Topic : Effect of Load p.f. on Wattmeter Readings
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David
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Effect of Load p.f. on Wattmeter Readings We have seen above See Fig. (a) that for lagging load (balanced) power factor of cos (Φ), the two wattmeter readings are : Note that total power is obtained by subtracting the reading of W1 from W2. We arrive at a very important conclusion that if load p .1 is less than 0.5, then lower reading wattmeter (i.e. W1 in this case) will give negative reading. | |
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