Sliding switching device for pre-checking short-circuit in main wiring 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 on 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...

Examples

Embodiment Construction

[0019] In order to enable the public to fully understand the technical essence and beneficial effects of the present invention, the applicant will describe the specific embodiments of the present invention in detail below in conjunction with the accompanying drawings. However, the applicant’s description of the embodiments is not a limitation on the technical solution. Any changes in form but not in substance of the inventive concept should be regarded as the protection scope of the present invention.

[0020] See figure 1 , figure 2 with image 3 , The present invention relates to a sliding switching device for short-circuit pre-checking of the main wiring of a low-voltage circuit breaker. The low-voltage circuit breaker includes a contact system 1, a central shaft 2, a locking device 3, an operating handle 4, a base 5 and Arc suppression chamber 6. In this embodiment, the contact system 1 has three groups with the same structure, which are configured as three phases. Each con...

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 on 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...

Examples

Embodiment Construction

[0019] In order to enable the public to fully understand the technical essence and beneficial effects of the present invention, the applicant will describe the specific embodiments of the present invention in detail below in conjunction with the accompanying drawings. However, the applicant’s description of the embodiments is not a limitation on the technical solution. Any changes in form but not in substance of the inventive concept should be regarded as the protection scope of the present invention.

[0020] See figure 1 , figure 2 with image 3 , The present invention relates to a sliding switching device for short-circuit pre-checking of the main wiring of a low-voltage circuit breaker. The low-voltage circuit breaker includes a contact system 1, a central shaft 2, a locking device 3, an operating handle 4, a base 5 and Arc suppression chamber 6. In this embodiment, the contact system 1 has three groups with the same structure, which are configured as three phases. Each con...

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