I have a current imbalance in a three phase chiller motor (480v 300 hp)Each phase: 1- 200 2 - 215 3 - 252. The voltage imbalance for this is less than three percent. We are also seeing other motors in the facility experiencing current imbalance. We also see the power factor readings for each leg can be more than 1o percent diffeent. If one motor suffered current imbalance I would suspect a motor problem but five tend to lead to a distribution problem. Is it possible several nonlinear loads (277 lighting, etc.) can be a contributing factor?
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