Test Your Knowledge – Part 3

This will be the final question in this Test Your Knowledge series for motor reliability. Scroll to the end to see the correct answer.

On the Power Results page, Voltage Imbalance is 0.5%, Current Imbalance is 12%, and Impedance Imbalance is 12%. Power Factors for the three phases are 0.92, 0.91, and 0.92. The motor is running at 90% load under steady state conditions. Which fault zone is most likely to be the cause of these results?

A. Power Quality
B. Power Circuit
C. Rotor
D. Stator

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The correct answer is B. Power Circuit