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What is the effect of under, or over voltage on the ratings of a transformer?

April 26, 2017ratings transformer voltage

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What is the effect of under, or over voltage on the ratings of a transformer?

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If a transformer has lower than rated voltage applied, the KVA is reduced by the same percentage as the voltage is reduced. 1 or 2 percent overage will generally be tolerated by most transformers without reduction in KVA. Voltage in excess of 2% should not be applied unless overvoltage taps are provided.