| abstract |
(57) [Summary]nAn oil composition is provided which is useful as a high stress electrical insulating oil, particularly as a load tap changer oil for transformers. The composition comprises a major amount of a paraffinic oil having a low viscosity of less than about 20 cSt at 40 ° C. and an effective amount of an additive comprising at least one hindered phenolic antioxidant and a benzotriazole metal deactivator. System is included. |