Lubricant for gas insulated switchgear, and gas insulated switchgear

Patent metadata

Field	Value
Publication number	US-10155916-B2
Application number	US-201615537989-A
Country	US
Kind code	B2
Filing date	Feb 4, 2016
Priority date	Dec 25, 2014
Publication date	Dec 18, 2018
Grant date	Dec 18, 2018

Abstract

Provided is a lubricant for a gas insulated switchgear, with which properties of a base oil such as heat resistance, evaporation loss, fluidity under a low temperature, and chemical stability (oxidation resistance and HF resistance) are balanced at a level higher than the conventional level, and long service life and high reliability of the gas insulated switchgear are achieved. A lubricant for a gas insulated switchgear according to the present invention, contains: a base oil containing a polyalphaolefin having a kinematic viscosity at 40° C. of 50 mm2/s or more; and a thickener containing bisamides.

First claim

The invention claimed is:

1. A lubricant for a gas insulated switchgear, comprising:
a base oil containing a polyalphaolefin having a kinematic viscosity at 40° C. of 50 mm 2 /s or more; and a thickener containing methylene stearyl bisamide, wherein the lubricant has chemical stability in the presence of a decomposition product of SF 6 gas.

2. The lubricant for a gas insulated switchgear, according to claim 1 , wherein at least one kind of a conductivity imparting agent and a lubricity imparting agent is contained.

3. The lubricant for a gas insulated switchgear, according to claim 2 , wherein the conductivity imparting agent is graphite powder, and the lubricity imparting agent is molybdenum disulfide.

4. A gas insulated switchgear, comprising:
a gas circuit breaker;
a disconnector;
an installation switch;
a current transformer; and
a main bus,
wherein the gas circuit breaker, the disconnector, the installation switch, and the current transformer have sliding parts, and
the lubricant for a gas insulated switchgear according to claim 1 is applied to the sliding parts.

Assignees

• Hitachi Ltd

Inventors

• Nakakawaji Takayuki
• Akata Hiroyuki
• Moriyama Tomohiro
• Satou Kazuhiro
• Hirose Makoto

Classifications

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2050/10

  semi-solid; greasy · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2030/74

  Noack Volatility · CPC title