标准摘要
[中文适用范围]： 本部分IEC 62021描述了两种用于测定未使用和已使用电气用非矿物绝缘油酸度的程序。方法A为电位滴定法，方法B为比色滴定法。注1：在未使用和已使用的非矿物绝缘油中，可认为具有酸性特征的成分包括有机酸、酚类化合物、某些氧化产物、树脂、有机金属盐和添加剂。该方法可用于指示非矿物绝缘油在氧化条件下使用过程中发生的相对变化，无论 resulting 的非矿物油的颜色或其他性质如何。酸度可用于未使用非矿物绝缘油的质量控制。由于已使用非矿物绝缘油中存在多种氧化产物会贡献于酸度，且这些产物在腐蚀性质上差异很大，因此该测试不能用于预测非矿物绝缘油在服务条件下的腐蚀性。注2：通过电位法获得的酸度结果可能与通过比色法获得的结果在数值上相同或不同，但通常在数量级上是一致的。 [外文原描述]： IEC 62021-3:2014 describes two procedures for the determination of the acidity of unused and used electrical non-mineral insulating oils. Method A is potentiometric titration and Method B is colourimetric titration. The method may be used to indicate relative changes that occur in non-mineral insulating oil during use under oxidizing conditions regardless of the colour or other properties of the resulting non-mineral oil. The acidity can be used in the quality control of unused non-mineral insulating oil. As a variety of oxidation products present in used non-mineral insulating oil contribute to acidity and these products vary widely in their corrosion properties, the test cannot be used to predict corrosiveness of non-mineral insulating oil under service conditions.
英文名称Insulating liquids - Determination of acidity - Part 3: Test methods for non-mineral insulating oils