Mechanical Interlock Device Among Cable Door, Rear Door And Earthing Switch

Abstract

A mechanical device among a cable door, a rear door and an earthing switch which comprises a rear door locking device(21) for locking the rear door of an air insulated switchgear is provided; a rear shaft space-providing component(22) for providing a space-providing space to a rear outer shaft(211); an intermediate force transfer device(23) for transferring the acting force of a rear door closure to an unlock pin(113); and an unlock pin control device(24) for controlling the locking and unlocking of the unlock pin(113). The rear door locking device(21) comprise a rear door lock hook(216) positioned on the rear outer shaft(211) and a rear door lock groove(213) positioned on the rear door, the rear door lock hook(216) and the rear door lock groove(213) can interact to lock the rear door. The rear shaft space-providing component(22) is a C-shaped component(22) which is used for providing space to the rear outer shaft(211) when the earthing switch is switched off. The intermediate force transfer device(23) comprises the rear outer shaft(211) and a rear inner shaft(212), the rear outer shaft(211) is so installed and arranged that the rear outer shaft can rotate with an operation shaft(l ll), a pin(231) is fixed on the rear inner shaft(212) and used for limiting or permitting the insertion of the operation shaft(l ll). The invention ensures not only that the cable door and the rear door of the switchgear cannot be opened when the earthing switch is switched off, but also that the earthing switch can only be operated when both the cable door and the rear door are closed.

Description

technical field [0001] The invention relates to the technical field of electric power products, in particular to an interlocking device applied to a cable chamber door, a back door and a grounding switch on an air-insulated switchgear. The arrangement is particularly suitable for high-voltage switchgear installations with ST1-UG earthing switches. Background technique [0002] The purpose of the future "five-protection" (five-protection) interlocking of switchgear is to fundamentally avoid danger and misoperation that will cause serious problems, so as to protect the safety of operators and switchgear more effectively. In order to ensure safe and convenient operation, an interlock, preferably a mechanical interlock, is required between the different parts of the metal-cased switchgear and operating device. [0003] In conventional metal-enclosed air-insulated switchgear and operating gear, mechanical interlocks are only available between the cable compartment door and the e...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the potential safety hazard caused by the lack of mechanical interlock between the rear door and the grounding switch in traditional air-insulated switchgear, the present invention provides a reliable mechanical interlock device, which ensures that the cables of the switchgear Chamber and rear doors cannot be opened when the grounding switch is open, preventing operators from mistakenly entering field compartments

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