IEEE/ASA C57.12.10-1958 - American Standard Requirements, Terminology, and Test Code for Distribution, Power, and Regulating Transformers, and Reactors other than Current Limiting Reactors
Standard Details
This section covers electrical characteristics and mechanical features of 60-cycle, -winding, mineral-oil-immersed transformers rated 501 to 5,000 kva, inclusive, single-phase; 501 to 10,000 kva, inclusive, three-phase; high-voltage, 2,400to 67,000 volts, inclusive; low-voltage, 480 to 14,400 volts, inclusive, generally used for step-down purposes.
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