IEC 62975:2021提供了在密封变压器和其他电气设备中使用和维护天然酯液体的程序和指南。 本文件适用于天然酯，天然酯最初按照IEC 62770和其他适用标准（如ASTM D6871）提供，用于变压器、开关设备和电气设备中，液体取样是可行的，且设备规范中规定的正常操作条件适用。 目前，除变压器外，电气设备的可用信息量有限。 本文件还旨在帮助电力设备操作员评估天然酯的状况，并将其保持在可用状态。它还为制定更具体、更完整的地方业务守则提供了共同基础。 该文件包括关于测试和评估程序的建议，并概述了必要时修复和回收液体的方法。

IEC 62975:2021 provides procedures and guidelines that are intended for the use and maintenance of natural ester liquid in sealed transformers and other electrical equipment. This document is applicable to natural esters, originally supplied conforming to IEC 62770 and other applicable standards (e.g. ASTM D6871) in transformers, switchgear and electrical apparatus where liquid sampling is practical and where the normal operating conditions specified in the equipment specifications apply. At present, there is a limited amount of information available for electrical equipment other than transformers. This document is also intended to assist the power equipment operator to evaluate the condition of the natural ester and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice. The document includes recommendations on tests and evaluation procedures and outlines methods for reconditioning and reclaiming the liquid, when necessary.