This document provides procedures and supervision for the use and maintenance of synthetic esters in transformers and other electrical equipment.

This document is applicable to synthetic esters, originally supplied conforming to IEC 61099 and other applicable standards in transformers, switchgear and electrical apparatus where liquid sampling is practical and where the normal operating conditions specified in the equipment specifications apply.

This document is also intended to assist the power equipment operator in evaluating the condition of the synthetic ester and in maintaining it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice.

This document includes recommendations on tests and evaluation procedures and outlines methods for reconditioning and reclaiming the liquid, when necessary.