Contact arc-extinguishing system used for dual-power-supply automatic changeover switch

Abstract

The invention provides a contact arc-extinguishing system used for a dual-power-supply automatic changeover switch. The contact arc-extinguishing system comprises a commonly used power supply contact component, a backup power supply contact component and an arc-extinguishing shield. The backup power supply contact component and the commonly used power supply contact component are arranged in an opposing way. The moving contact acting surface of a commonly used power supply moving contact group and the moving contact actuating surface of a backup power supply moving contact group are arranged in different working planes. The arc-extinguishing shield is provided with a commonly used power supply arc-extinguishing chamber and a backup power supply arc-extinguishing chamber which are mutually isolated. The extension length of the commonly used power supply arc-extinguishing chamber and the backup power supply arc-extinguishing chamber along the longitudinal direction of the dual-power-supply automatic changeover switch is equivalent to distance from the commonly used power supply contact component to the backup power supply contact component. According to the contact arc-extinguishing system, the arc-extinguishing chambers are enabled to obtain maximum arc-extinguishing distance and arc-extinguishing time within the limited volume of the installing box of the dual-power-supply automatic changeover switch so that attenuation of arc energy is facilitated and a better arc extinguishing effect can be obtained; meanwhile, the contact arc-extinguishing system is simple in structure and stable and reliable in work.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical accessories, in particular to a contact arc extinguishing system for a dual-power automatic transfer switch. Background technique [0002] Dual power automatic transfer switch is a commonly used low-voltage electrical appliance. It is often used to switch between two power sources to ensure that when one power source fails or stops supplying power, the other power source can be quickly switched to ensure the normal power supply of the load circuit. The transfer executive element of the PC-level dual power automatic transfer switch is generally a transfer switch. An arc extinguisher should be set between the dynamic and static contacts of the transfer switch to quickly break off the load current or fault current generated by the dual power supply during the transfer process. the arc. [0003] There are usually two methods for setting the arc chute in the prior art: [0004] One is ...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the arc extinguishing distance of the arc extinguishing cover is too short in the prior art in the arc extinguishing system of the dual power supply automatic transfer switch, resulting in poor arc extinguishing effect, thereby providing a simple structure, Good arc effect is used in the contact arc extinguishing system of dual power automatic transfer switch

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