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About This Item

 

Full Description

Scope

Terminal markings and connections for distribution and power transformers, not including rectifier transformers.

Purpose

To review and update C57.12.70 which was last issued in 1978.

Abstract

Revision Standard - Superseded. Supersedes C57.12.70-1978 (R1992). Standard terminal markings and connections are described for single-phase and three-phase distribution,power,and regulating transformers.For terminal markings,it covers sequence designation, external terminal designation, neutral terminal designation, grounded terminal designation, and marking of full and tap winding terminals. Additive and subtractive polarity and parallel transformer operation are described.Connections of single-phase transformers in various configurations and angular displacement of three-phase transformers to connect to various system phase displacements are covered.
 

Document History

  1. IEEE C57.12.70-2020


    IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers

    • Most Recent
  2. IEEE C57.12.70-2011


    IEEE Standard for Standard Terminal Markings and Connections for Distribution and Power Transformers

    • Historical Version
  3. IEEE C57.12.70-2000

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    IEEE Standard Terminal Markings and Connections for Distribution and Power Transformers

    • Historical Version