Determination of the oxidation induction time of mineral insulating oils using a modified EN 14112 method

The most common cause of chemical aging of insulating oils is oxidation. Inhibited oils are insulating oils to which an oxidation inhibitor such as 2,6 ditertiary-butyl phenol or 2,6 dietertiary-butyl cresol has been added in order to slow the rate of oxidation [1]-[3]. The oxidation induction time (OIT) is the time at which the oxidation inhibitor has been exhausted.