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If secondary side of the 3 phase transformer has any issue, it would result unbalanced voltage between phases. Other reason could be if the load on one phase is highly different than other phase, it also would result in unbalanced voltage.

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8y ago
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8y ago

Since the word phase was used in the question a three phase system is assumed. What must be stated is the type of three phase connection. If the voltage check is taken from each leg to ground and that is where the voltage is found to be higher on one leg, the connection might be a high leg delta connection. This is a normal condition.

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Q: What will cause my voltage to be higher on one phase and lower on the other?
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