| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrical insulation oil composition that is superior in both electrical insulation characteristic and oxidation stability than the conventional ones.SOLUTION: The electrical insulation oil composition according to the present invention contains a refined mineral oil having a flash point according to the open-type flash point testing method, of 150°C or more and having a maximum value of the peak of ultraviolet absorption spectrum at wavelength of 190 to 350 nm according to the UV-visible absorbance measuring method, of 5 or less, and an oxidation inhibitor by 0.06 mass% or more and 0.5 mass% or less based on the total amount of the electrical insulation oil composition, and in which the kinematic viscosity at 40°C is 12 mm/s or less and the flow point is -30°C or less. |
