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Scope

The recommended practice applies only to two winding transformers covered by ANSI/IEEE C57.12.00, ANSI/IEEE C57.12.01 and NEMA St. 20. It does not apply to Rectifier Transformers.

Purpose

The purpose of this document is to establish uniform methods for determining the capability of transformers to supply nonsinusoidal load currents of known characteristics.

Abstract

Revision Standard - Superseded. Superseded by IEEE Std C57.110-2008. Methods are developed to conservatively evaluate the feasibility of supplying additional nonsinusoidal load currents from an existing installed dry-type or liquified transformer, as a portion of the total load. Clarification of the necessary application information is provided to assist in properly specifying a new transformer expected to carry a load, a portion of which is composed of nonsinusoidal load currents. A number of examples illustrating these methods and calculations are presented. Reference annexes make a comparison of the document calculations to calculations found in other industry standards and suggested temperature rise methods are detailed for reference purposes.
 

Document History

  1. IEEE C57.110-2018


    IEEE Recommended Practice for Establishing Liquid Immersed and Dry-Type Power and Distribution Transformer Capability when Supplying Nonsinusoidal Load Currents

    • Most Recent
  2. IEEE C57.110-2008


    IEEE Recommended Practice for Establishing Liquid-Filled and Dry-Type Power and Distribution Transformer Capability When Supplying Nonsinusoidal Load Currents

    • Historical Version
  3. IEEE C57.110-1998

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    IEEE Recommended Practice for Establishing Transformer Capability When Supplying Nonsinusoidal Load Currents

    • Historical Version