A kind of mechanical interlocking device and ring main unit for dual incoming line standby automatic switching

Abstract

The present invention provides a mechanical interlocking device for self-injection with dual incoming lines and a ring network cabinet, wherein the mechanical interlocking device includes: a first circuit breaker body, a second circuit breaker body, a first horizontal slide, a second horizontal slide piece, the first vertical sliding piece and the second vertical sliding piece, the first circuit breaker body and the second circuit breaker body are arranged in parallel at left and right intervals, the first horizontal sliding piece and the second horizontal sliding piece are connected with the first circuit breaker body and The second circuit breaker body is horizontally slidably connected; the first vertical slide is vertically slidably connected to the first circuit breaker body, and a first horizontal limit plate is provided on the side to touch the approach of the first horizontal slide The first circuit breaker body end; the second vertical slider is vertically slidably connected with the second circuit breaker body, and a second horizontal limit plate is provided on the side, which is used to touch the second horizontal slider close to the second The main body end of the circuit breaker; the present invention not only realizes the automation of standby automatic switching, but also meets the requirements for five-proof interlocking, and has a simple structure and low cost.

Description

technical field [0001] The invention belongs to the technical field of electric power equipment, and in particular relates to a mechanical interlocking device for dual-incoming line backup and self-injection and a ring network cabinet. Background technique [0002] With the increasing modernization of people's production and life in our country, people's demand and dependence on electricity are also multiplying, the requirements for power quality are also stricter, and the requirements for reliable power supply are getting higher and higher. The existing technology improves the reliability of power supply by installing a backup incoming line automatic switch-in device (referred to as backup automatic switch-on) in the main and backup double-circuit lines and multiple-circuit power supply lines, and connects the backup line to supply power when the bus fails to supply power. However, in actual use, the main supply line and the backup supply line in the high-voltage switchgear...

AI Technical Summary

Problems solved by technology

However, in actual use, the main supply line and the backup supply line in the high-voltage switchgear cannot be connected at the same time, otherwise there will be safety accidents such as short circuit, fire, or even explosion.

[0003] Some of the existing self-switching schemes on the market only use electrical interlocking, without mechanical interlocking, or use pull ropes for interlocking. If only electrical interlocking is used, when incoming line 1 is closed, incoming line 2 can also be closed. Manual closing, which will cause potential safety hazards in practical applications

At the same time, there are certain unreliable factors in the pull rope solution. For example, the performance of the pull rope will also change with the change of the ambient temperature, so that the interlocking parts may not be in place, and there will be safety hazards in the application. At the same time, it is not satisfactory. One of the five prevention requirements (to prevent mis-opening and mis-closing circuit breakers)

[0004] Traditionally, the patent application number is 201402275827.9, a kind of mechanical interlocking mechanism for automatic switching equipment of medium voltage switchgear, which proposes a mechanical interlocking mechanism for automatic switching equipment, which uses connecting rope transmission to realize mechanical interlocking , the strength of the connecting rope in this scheme cannot meet the strength requirements of the switch action, and it is easy to break, resulting in unreliable interlocking

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