Hitachi, Ltd.

Hiroki Honma

Koji Sasaki

Tokio Yamagiwa

To provide a gas insulation switch reducing the SF gas use amount without damaging the insulation performance and arc extinguishing performance, the present invention uses SF gas as insulating gas to be charged in the grounding tank of a unit having a switching unit of the breaker the disconnecting switches and and the grounding switches and for example, the line unit and uses gas having a smaller warming coefficient than that of SF gas, for example, nitrogen gas or air as insulating gas to be charged in the grounding tank of a unit having no switching unit, for example, the main bus units and and the connection bus unit

Gas insulation switch

A gas insulation switch has a container charged with insulating gas which contains an electric conductor and at least a pair of contactors. The container is divided into a plurality of sections. For the sections which have no switching devices or separable contactors, a different insulating gas is used as compared with that for the sections having breakers or separable contactors. In particular, in the section of the container, such as a grounding tank, that contains only electric conductors without separable contactors, an insulating gas having a smaller earth warming coefficient or global warming coefficient than that of SF,gases is used. On the other hand, for the section of the grounding tank which contains a breaker or switch having separable contactors, an SF,insulating gas is used. Since SF,gas is known to have a high earth or global warming coefficient, as compared with air or nitrogen gas, the SF,gas is only used as the insulating gas in the grounding tank for the sections in which superior arc extinguishing performance is required. Accordingly, the gas insulation switch has a reduced requirement for SF,gas.

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Hitachi, Japan

Hiroki Honma