This part of IEC 62021 describes the procedure for the determination of the acidity of unused and used electrical mineral insulating oils. The method may be used to indicate relative changes that occur in a mineral insulatin oil during use under oxidizing conditions regardless of the colour or other properties of the resulting mineral oil. The acidity can be used in the quality control of unused mineral oil. As a varity of oxidation products present in used mineral oil contribute to acidity and these products vary widely in their corrosion properties, the test cannot be used to predict corrosiveness of a mineral oil under service conditions.
DS/EN 62021-1:2004 history
2004DS/EN 62021-1:2004 Insulating liquids - Determination of acidity - Part 1: Automatic potentiometric titration