scope:

This standard describes three test methods using the same apparatus for evaluating the oxidation stability of mineral insulating oils and of hydrocarbon-based insulating liquids. It comprises four sections as follows: Section 1 describes the following items common to the three methods: - the equipment and reagents; - the cleaning of the glassware;- the preparation of the catalyst and of the insulating sample to be tested; - the determinations on the oxidized insulating liquid. Section 2 - Method A describes a method for evaluating the oxidation stability of unused uninhibited mineral insulating oils under accelerated conditions. Section 3 - Method B describes a method for evaluating the oxidation stability of unused inhibited mineral insulating oils under accelerated conditions. Section4 - Method C describes a method for evaluating the oxidation stability of unused uninhibited hydrocarbon insulating liquids under accelerated conditions.