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Purpose

The purpose of this guide is to aid in the effective application of relays and other devices for the protection of power transformers. Emphasis is placed on practical applications, the general philosophy and economic considerations involved in transformer protection are reviewed, the types of faults experienced are described, and technical problems with such protection, including current transformer behavior during fault conditions are discussed. Various types of electrical, mechanical, and thermal protective devices are also described and associated problems such as fault clearing and re-energizing considerations are discussed.

Abstract

New IEEE Standard - Superseded.
 

Document History

  1. IEEE C37.91-2021


    IEEE Guide for Protecting Power Transformers

    • Most Recent
  2. IEEE C37.91-2008


    IEEE Guide for Protecting Power Transformers

    • Historical Version
  3. IEEE C37.91-2000


    IEEE Guide for Protective Relay Applications to Power Transformers

    • Historical Version
  4. IEEE C37.91-1985

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    IEEE Guide for Protective Relay Applications to Power Transformers

    • Historical Version