IEC 61125:2018描述了一种测试方法，用于评估在加速条件下递送状态下的绝缘液体的氧化稳定性，无论是否存在抗氧化剂添加剂。测试的持续时间可以根据绝缘液体类型而不同，并且在相应的标准中定义(例如，在IEC 60296、IEC 61099、IEC 62770中)。该方法可用于测量诱导期，在矿物油的情况下，继续测试直到挥发性酸度显著超过0.10 mg KOH/g。在酯液体的情况下，该值可以显著更高。 其他测试方法，如IEC TR 62036中描述的基于差示扫描量热法的那些，也可用作筛选测试，但超出了本文档的范围。这第二版取消并取代了1992年出版的第一版和修正案1:20 04。本版构成技术修订版。 与上一版相比，此版本包括以下重大技术变更: a)已修改标题以包括不同于矿物绝缘油(烃)的绝缘液体； b)该方法适用于隔离处于递送状态的液体； c)以前的方法C现在是主要的规范方法； d)更新了主要标准方法关于耗散系数的精度数据； e)先前的方法A已被删除； f)以前的方法B已移至附件B； g)评估酯的热氧化行为的新方法包括在附录C中。

IEC 61125:2018 describes a test method for evaluating the oxidation stability of insulating liquids in the delivered state under accelerated conditions regardless of whether or not antioxidant additives are present. The duration of the test can be different depending on the insulating liquid type and is defined in the corresponding standards (e.g. in IEC 60296, IEC 61099, IEC 62770). The method can be used for measuring the induction period, the test being continued until the volatile acidity significantly exceeds 0,10 mg KOH/g in the case of mineral oils. This value can be significantly higher in the case of ester liquids.
Additional test methods such as those described in IEC TR 62036 based on differential scanning calorimetry can also be used as screening tests, but are out of the scope of this document.
This second edition cancels and replaces the first edition published in 1992 and Amendment 1: 2004. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the title has been modified to include insulating liquids different from mineral insulating oils (hydrocarbon);
b) the method applies for insulating liquids in the delivered state;
c) former Method C is now the main normative method;
d) precision data of the main normative method has been updated concerning the dissipation factor;
e) former Method A has been deleted;
f) former Method B has been transferred to Annex B;
g) a new method evaluating the thermo-oxidative behaviour of esters is included in Annex C.