ECN Forum Forums General Topics of the Trade General Discussion Area phase unbalanced, industrial facilities

Thanks DOC, well i figure i have alot of time to go in my field and i want to do things right and learn as much as i can. and help others learn as well.

jlh'— Good overview. All I can add is a copy of a motor horsepower derating curve from ANSI Standard C84.1 §D that reflects your numbers of reduction versus voltage imbalance. 1% imbalance requires no significant derating. 3% yields a derating of 11%. 5% imbalance needs a derating to 25%, or stator-insulation life will be significantly shortened.

D chart