IEC 62770:2024描述了变压器和类似的液体浸没式电气设备中未使用的天然酯的规范和测试方法，其中需要液体作为绝缘和传热介质。天然酯暴露于空气会导致绝缘液劣化。因此，天然酯的使用仅限于密封单元，或通过膜或其他合适的系统保护储罐不与大气接触。

IEC 62770:2024 describes specifications and test methods for unused natural esters in transformers and similar liquid-immersed electrical equipment in which a liquid is required as an insulating and heat transfer medium. The exposure of natural ester to air leads to deterioration of the insulating liquid. Use of natural esters is therefore restricted to sealed units, or with the conservator tank protected from the contact with atmosphere by a membrane or other suitable system.