电工流体.变压器及类似电气设备未使用的天然酯

[中文适用范围]： 本标准规定了用于变压器和类似油浸式电气设备中未使用的天然酯的规格和试验方法，这些设备需要液体作为绝缘和传热介质。不推荐使用天然酯于暴露在大气中的电气设备。在本标准中，术语“天然酯”适用于具有合适生物降解性和环境相容性的变压器和类似电气设备的绝缘流体。此类天然酯包括从种子获得的植物油和从其他适宜生物材料获得的油，并按约定地点和时间交付。这些油由甘油三酯组成。含添加剂的天然酯在本标准范围内。由于化学成分不同，天然酯区别于具有高闪点（如合成酯或硅油）的矿物绝缘油和其他绝缘流体。具有低粘度的天然酯衍生绝缘流体已被引入，但不在本标准范围内。相关特性见附录 B。本标准仅适用于未使用的天然酯。回收的天然酯和与非天然酯流体混合的天然酯超出本标准范围。标准中使用的化学命名法和科学符号符合国际纯化学和应用化学联合会（IUPAC）手册《物理化学中的量、单位和符号》。 [外文原描述]： IEC 62770:2013 describes specifications and test methods for unused natural esters in transformers and similar oil-impregnated electrical equipment in which a liquid is required as an insulating and heat transfer medium. Natural esters with additives are within the scope of this standard. Because of their different chemical composition, natural esters differ from insulating mineral oils and other insulating fluids that have high fire points, such as synthetic esters or silicone fluids. Natural, ester-derived insulating fluids with low viscosity have been introduced but are not covered by this standard. Pertinent properties of such fluids are given in Annex B. This standard is applicable only to unused natural esters. Reclaimed natural esters and natural esters blended with non-natural esters fluids are beyond the scope of this standard.