| 摘要 |
PROBLEM TO BE SOLVED: To provide electric insulating oil with a low pour point even without the use of a pour-point depressant aggravating electric characteristics, excellent in hydrogen gas absorptivity, with destruction of isolation prevented due to freezing and floating of moisture mixed into a transformer, with low danger of fire because of high flash point, or further, completely free from erosion since few sulfur components are included, and also endowed with excellent electric characteristics and practical performance. SOLUTION: The electric insulating oil is with a pour point of -45°C or less, a kinetic viscosity (40°C) of 6 to 10 mm<SP>2</SP>/s, a flash point (PM) of 135°C or more, a density (20°C) of 0.895/L or less, an aniline point of 63 to 90°C, a sulfur content of less than 3 mass ppm, a nitrogen content of 3 mass ppm or less, a basic nitrogen content of 1 mass ppm or less, an aromatic content of 5 mass% or more, and an antioxidant of 0.05 to 0.5 mass%. COPYRIGHT: (C)2009,JPO&INPIT |
