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C57.12.91-1995  -  IEEE Standard Test Code for Dry-Type Distribution and Power Transformers

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Methods for performing tests specified in IEEE Std C57.12.01-1989 and other referenced standards applicable to dry-type distribution and power transformers are described. This standard is intended for use as a basis for performance, safety, and the proper testing of dry-type distribution and power transformers. This standard applies to all dry-type transformers except instrument transformers, step-voltage and induction voltage regulators, arc furnace transformers, rectifier transformers, specialty transformers, and mine transformers. The following tests are covered: resistance measurements; polarity and phase relation tests; ratio tests; no load losses and excitation current; load losses and impedance voltage; dielectric tests; temperature tests; short-circuit tests; audible sound level measurements; and mechanical design tests.

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