Sliding-type switching device used for main-connection-line short circuit precheck of low-voltage circuit breaker

Abstract

Disclosed is a sliding-type switching device used for main-connection-line short circuit precheck of a low-voltage circuit breaker and the switching device belongs to the field of accessories of low-voltage electric appliances. The low-voltage circuit breaker includes contact systems, a center shaft, a locking device, an operating handle, a base and an arc extinction chamber. The contact systems include dynamic contact mechanisms. The dynamic contact mechanisms include dynamic-contact contact arms. Each sliding-type switching device is characterized by including a precheck contact plate, a pair of sliding contact shoes and a pair of sliding contact plates. Each precheck contact plate is installed at the middle part of one side of a corresponding dynamic-contact contact arm, backing on to a corresponding static contact mechanism. The pair of sliding contact shoes are fixed at the two ends of a corresponding precheck contact plate. Each pair of sliding contact plates are fixed on the base and are in slide cooperation with a corresponding pair of sliding contact shoes. Each sliding contact plate includes a fixing plate. Each fixing plate is provided with insulating layers near the two ends of the upper surface along a slide rail of a corresponding contact shoe and a conductive layer at the middle part. When the sliding contact shoes slide to the conductive layers, the sliding contact shoes are electrically connected with the conductive layers. The sliding-type switching device can be used for detecting short-circuit faults of a load-side main connection line before switch-on of a low-voltage circuit breaker.

Description

Technical field [0001] The invention belongs to the technical field of low-voltage electrical accessories, and specifically relates to a sliding switch device used for short-circuit pre-checking of the main wiring of a low-voltage circuit breaker. It serves as an auxiliary switch of the low-voltage circuit breaker and detects the main wiring of the load side before the low-voltage circuit breaker is closed. A short-circuit condition does not affect the normal safe power supply after the low-voltage circuit breaker is closed. Background technique [0002] In the low-voltage power distribution system, the line input is blind, that is, the low-voltage circuit breaker cannot predict whether there is a fault in the transmission line to be closed before the input. If the low-voltage circuit breaker is closed when there is a short-circuit fault in the main wiring on the load side, it will cause equipment and personal safety accidents. How to avoid this situation through technical measu...

AI Technical Summary

Problems solved by technology

In the published Chinese patent literature, there is no lack of technical information related to low-voltage circuit breakers and low-voltage circuit breaker accessories, such as a "multi-functional circuit breaker accessory" recommended by China Invention Patent Authorization Announcement No. CN102082046B, China Invention Patent Authorization Announcement No. An "auxiliary contact device for a circuit breaker" announced by CN101373689B, an "auxiliary switch device for a circuit breaker" mentioned in the Chinese invention patent authorization announcement number CN1230854C, and a Chinese utility model patent authorization announcement number CN202816820U. A kind of "auxiliary switch of circuit breaker", a kind of "multifunctional circuit breaker accessory" provided by Chinese utility model patent authorization announcement number CN201576639U, a kind of "circuit breaker's Auxiliary switch", a "circuit breaker auxiliary switch" disclosed in the Chinese utility model patent authorization announcement number CN201307569Y, a "circuit breaker auxiliary contact" disclosed in the utility model patent authorization announcement number, and utility model patent authorization announcement number CN2847515Y The "auxiliary switch of an intelligent circuit breaker" and so on are involved, but the aforementioned patent documents do not involve a special auxiliary switch for pre-checking the short circuit of the main wiring on the load side of the low-voltage circuit breaker

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