Motors and Voltage Imbalance, Part 1

Voltage imbalance occurs when two or more phases differ in voltage. Motors are especially vulnerable to voltage imbalance. You can find published recommendations, such as the oft-quoted 3%. The context of this number is that of preventing motor failure and 3% is dangerous territory. At 5%, you shouldn’t even operate the motor.

Motor failure isn’t the only result of voltage imbalance. Any imbalance means energy waste plus additional heat in the motor. Ideally, you will redu

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