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 reduce ...

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