IEEE C57.93a-2025

Current Amendment
IEEE Guide for Installation and Maintenance of Liquid-Immersed Power Transformers

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IEEE C57.93a-2025

IEEE Guide for Installation and Maintenance of Liquid-Immersed Power Transformers

PUBLISH DATE 2025
PAGES 22
IEEE C57.93a-2025

Amendment Standard - Active.

The amendment recommends Cold start methods of power transformers filled with natural ester liquids are recommended in this amendment.

This standard was amended to include recommended cold start methods of power transformers filled with natural ester liquids.

The scope for the amendment is shown as follows:

  • Requirements for properties of natural ester liquids under cold conditions.
  • Cold start procedure of natural ester-filled power transformers.
  • Liquid warming procedures.
  • Operation requirements for the transformer's mechanically operated devices.
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