Double-incoming-wire spare power automatic switching mechanical interlocking device and ring main unit

Abstract

The invention provides a double-incoming-line spare power automatic switching mechanical interlocking device and a ring main unit. The mechanical interlocking device comprises a first circuit breaker body, a second circuit breaker body, a first horizontal sliding part, a second horizontal sliding part, a first vertical sliding part, and a second vertical sliding part. The first circuit breaker body and the second circuit breaker body are arranged in parallel at intervals left and right, and the first horizontal sliding piece and the second horizontal sliding piece are in horizontal sliding connection with the first circuit breaker body and the second circuit breaker body; the first vertical sliding part is vertically and slidably connected with the first circuit breaker body, and a first horizontal limiting plate is arranged on the side edge of the first vertical sliding piece and used for abutting against the end, close to the first circuit breaker body, of the first horizontal sliding piece; the second vertical sliding part is in vertical sliding connection with the second circuit breaker body, and a second horizontal limiting plate is arranged on the side edge of the second vertical sliding piece and used for abutting against the end, close to the second circuit breaker body, of the second horizontal sliding piece. The device meets the requirement for five-prevention interlocking while achieving spare power automatic switching automation, and is simple in structure and low in 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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