Title:
ELECTRICAL INSULATION OIL COMPOSITION
Document Type and Number:
Japanese Patent JP2022157909
Kind Code:
A
Abstract:
To provide an electrical insulation oil composition excellent in corrosion resistance and also superior in hydrogen gas absorption and oxidation stability.SOLUTION: An electrical insulation oil composition includes a mineral oil-based base oil satisfying the following requirements (1) to (5): (1) %CA by a ring analysis (n-d-M method) being 4.5 or more and 6.8 or less; (2) a %CN by a ring analysis (n-d-M method) being 46.0 or more; (3) a sulfur content being 80 mass ppm or more and 200 mass ppm or less based on total amount standard of the mineral oil-based base oil; (4) a rating of copper plate corrosion test measured according to JIS K2513:2000 in a corrosive sulfur test (ASTM D1275 B method) being 2 or less; and (5) %CA and %CN by a ring analysis (n-d-M method) satisfying the formula (I): %CA+(%CN/3)>21.1.SELECTED DRAWING: Figure 1
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Inventors:
ONO TAKASHI
NAKAMURA MASAJI
NAKAMURA MASAJI
Application Number:
JP2021062415A
Publication Date:
October 14, 2022
Filing Date:
March 31, 2021
Export Citation:
Assignee:
IDEMITSU KOSAN CO
International Classes:
H01B3/46; C10M101/02; C10M171/00
Attorney, Agent or Firm:
Patent Attorney Corporation Otani Patent Office