| 摘要 |
PURPOSE:To make oxidative deterioration compositionally difficult by using an insulating oil whose ratio of an aromatic component quantity to a sulfur component quantity (aromatic component quantity/sulfur component quantity) is 250 or larger. CONSTITUTION:An insulating oil is made hard to deteriorate due to oxidation by selectively mixing an aromatic component quantity which is comparatively hard to deteriorate and a sulfur component quantity which is comparatively easily deteriorated. That is, insulating oil whose ratio of an aromatic component quantity to a sulfur component quantity is 250 or larger is used. In this case, the insulating oil is mainly made of hydrocarbon; main components are classified into such three components as paraffin, naphthene and an aromatic group. Of them, the paraffin is one where satutated hydrocarbon is arranged like a chain, and the naphthene is called cycloparaffin where saturated hydrocarbon is arranged like a ring, and the aromatic group is one where hydrocarbon containing such unsaturated bonds as benzene ring and naphthalene ring is arranged like a ring. An oil filled electric equipment provided with an insulating oil whose ratio of an aromatic component quantity to a sulfur component quantity is 250 or larger can make the insulating oil hardly deteriorate. |
