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- Q517 - Electrical, Electronic, & Control Engineering
52. A three-phase alternator is operating at 450 volts with the switchboard ammeter indicating 300 amps. The kW meter currently indicates 163.6 kW, with a power factor of 0.7. If the power factor increases to 0.8, how much would the kW meter reading increase by?
With constant voltage and current, real power in a three-phase system increases proportionally to the power factor. Increasing the power factor from 0.7 to 0.8 results in a kW meter increase of approximately 23.2 kW.
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