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Transformer Turns Ratio Magnetic Balance

Transformer turns ratio is measured by applying line frequency AC voltage to one winding of a transformer and measuring the induced voltage on the corresponding winding.

Magnetic balance excites the transformer the same way, but instead of measuring the induced voltage on the corre-sponding winding, the induced voltage on the same winding is measured.

The is capable of performing a magneticbalance test on any vector configuration in under 30 seconds.  But what are the benefits to this method oftesting?