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C57.12.51 - Guide for Mechanical Interchangeability of Ventilated Dry Type Transformers

This guide sets forth characteristics of ventilated dry type transformers relating to performance, limited electrical and mechanical interchangeability, as well as recommended practice for installation of the equipment described, and to assist in the proper selection of such equipment. Specific rating combinations are described up to a base of 7500 kVA, high-voltage class from 1.2kV to 36 kV inclusive, and low-voltage class up to 5kV. This guide does not apply to other types of transformers such as specialty, sealed dry-type, pad-mounted dry-type, instrument, step and induction voltage regulators, arc-furnace, mining, testing, welding and rectifier transformers.
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