Gas switch

Abstract

A decompression lock mechanism 5 is composed of: a pressure detection mechanism 6 having an operation shaft 6a moving in response to the variation of pressure in the gas vessel 2 of this gas switch, wherein the operation shaft is led out to the outside of one wall 2a of the gas vessel; a pressure detection lock mechanism part 7 mounted on the outside of the gas vessel and having an output part 7a rotating when the operation shaft 6a moves in response to the drop of pressure in the gas vessel; an operation handle lock mechanism part 9 provided with an input part 9a mechanically connected to the output part 7a of the pressure detection lock mechanism part 7 and rotated together with the output part, and a lock lever 901 rotated to a lock position hindering the operation of an operation handle 4 of the gas switch 1 when the input part is rotated; and a cover 8 covering components of the lock mechanism parts 7 and 9.

Description

technical field [0001] The invention relates to a gas switch in which contacts and an operating mechanism of the switch are accommodated in a gas container sealed with insulating gas. Background technique [0002] As shown in Patent Document 1, the gas switch is to switch the SF 6 A gas container in which insulating gas such as gas is enclosed as an arc-extinguishing medium houses fixed contacts, movable contacts, and an operating mechanism for operating the movable contacts. It is used in the box of installation type transformation equipment. [0003] In the gas switch, in order to obtain the specified arc suppression performance and ensure the safety of the operator, the pressure in the gas container must be kept above the specified value, and if the air pressure in the container is lower than the specified value, its operation must be prohibited. Therefore, it is necessary to provide a decompression locking device in the gas switch, and the decompression locking device ...

AI Technical Summary

Problems solved by technology

[0011] However, since the cover covering the components of the decompression locking mechanism must be mounted on the outside of the gas container through sealing members such as packing or gaskets, the compression of the sealing member when the cover is installed is necessary. The deviation of the amount will cause the position of the guide hole passing through the locking rod to deviate, and then there will be a problem of difficulty in matching the position between the guide hole of the cover and the locking rod

[0012] If the positional relationship between the guide hole of the cover body and the locking rod cannot be adjusted correctly, the frictional resistance between the locking rod and the inner surface of the guide hole will increase, which may cause the locking rod to slide smoothly and prevent decompression. The locking mechanism operates smoothly

Also, even if the cover is installed correctly, if dust is clogged in the gap between the lock rod and the inner circumference of the guide hole of the cover, or rainwater is soaked in the gap between the lock rod and the inner circumference of the guide hole of the cover, etc. Furthermore, when the moisture in the gap freezes, it will be difficult for the locking rod to move, so when the air pressure drops, the locking mechanism may not work normally, and the reliability of the protective operation based on the decompression locking mechanism will also decrease.

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