Anti-locking device for metal-enclosed switchgear and metal-enclosed switchgear

Abstract

The invention relates to a misoperation prevention back locking deivce applied to a metal-enclosed switchgear, in particular to a cable chamber door and switch joint locking device. The back locking deivce of the metal-enclosed switchgear comprises a switchgear body, a blocking mechanism, a transmission mechanism and a trigger mechanism, wherein an earthed switch operation shaft is arranged on the switchgear body. The trigger mechanism is stressed when a cable chamber door is closed and drives the blocking mechanism through the transmission mechanism, and blocking on rotating of the earthed switch operation shaft is unlocked; and when the cable chamber door is opened, the trigger mechanism can reset under the effect of gravity of parts of the trigger mechanism and drives the blocking mechanism through the transmission mechanism, and rotating of the earthed switch operation shaft is blocked. Compared with the prior art, gravity of the parts of the trigger mechanism serves as driving force for resetting of the blocking mechanism and is more reliable than a spring, and good achievement of five-prevention requirements is facilitated.

Description

technical field [0001] The invention relates to an anti-misoperation anti-locking device for metal-enclosed switchgear, in particular to a device for interlocking a cable chamber door with a switch. Background technique [0002] Metal-enclosed switchgear (commonly known as switchgear) is a commonly used power distribution switchgear in power systems. As a kind of electrical equipment, in order to ensure the safe operation of the power grid and the safety of equipment and personnel, it has a certain function of preventing misuse. Important indicators, national standards for equipment of a certain specification in this regard mainly include: preventing mis-disconnection and mis-closing of circuit breakers; preventing load-disconnecting and closing isolating switches; The grounding wire (switch) is switched on; prevent mistakenly entering the electrified interval. Referred to as "five defenses". [0003] Specifically, the invention relates to how to realize anti-locking betwe...

AI Technical Summary

Problems solved by technology

[0005] Since the above structure uses a spring as the driving force for reset, the reliability is affected by the quality and life of the spring, especially when the door of this equipment is closed normally, so most of the time the spring is in a state of being squeezed, and it is easy to fatigue damage

In addition, when the door body is closed, it always directly touches the rotatable sleeve, causing unnecessary friction and wear, and also easily causing other problems.

[0006] The publication of the Chinese invention patent application with the patent number ZL201010232999.4 discloses an anti-locking device. Its structure is similar to that of a clutch, and it also uses spring force as the driving force for reset, which affects its reliability.

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