Solution: Calculate the new operating pf

Problem Statement: Electrical Engineering Professional Subjects

A three-phase turbo alternator has a reactance of 15 ohms and negligible resistance, the machine draws an armature current of 250 amperes at 0.8 pf lagging when running on 12,000 volts infinite bus-bars. If the steam admission is constant but the emf is raised by 20%, calculate the new operating pf.

A.  0.547

B.  0.586

C.  0.509

D.  0.575

Problem Answer:

The new operating pf a three-phase turbo alternator is equal to 0.575.

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