IEEE C57.93a-2025

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.



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