Arc extinguishing and circuit breaking device

Abstract

The invention relates to the technical field of power system protection, in particular to an arc extinguishing circuit breaking device. The device comprises an installation shell, a static contact, a moving contact and an insulation arc extinguishing piece. The installation shell is provided with a first containing cavity formed in the first direction and a second containing cavity formed in the second direction and communicated with the first containing cavity. The static contact is arranged in the first accommodating cavity; the moving contact is movably arranged in the first accommodating cavity along the extension direction of the first accommodating cavity, the moving contact can be connected to the static contact or separated from the static contact to connect or disconnect a circuit, and the joint of the moving contact and the static contact directly faces the second accommodating cavity; the insulating part is movably arranged in the second containing cavity in the extending direction of the second containing cavity, and when the moving contact is separated from the static contact, the insulating part can move to the position between the moving contact and the static contact to isolate arc discharge. The moving contact and the static contact are protected from being oxidized, and good conductive characteristics are kept.

Description

technical field [0001] The invention relates to the technical field of power system protection, in particular to an arc extinguishing and breaking device. Background technique [0002] In the low-voltage air circuit breaker, the arc extinguishing medium is air, but in fact the arc still has a certain conductivity in the air, so after the contacts of the low-voltage circuit breaker have been tripped and opened many times, some oxidation will occur on the surface. This will increase the contact resistance of the contact, thereby increasing the current-carrying temperature, and the temperature rise will further accelerate the oxidation of the contact. Such a vicious cycle will cause damage to the low-voltage circuit breaker, and even cause accidents such as fire. Contents of the invention [0003] The object of the present invention is to provide an arc extinguishing and circuit breaking device, which can effectively block the arc discharge in the air at the disconnected part...

AI Technical Summary

Problems solved by technology

[0002] In the low-voltage air circuit breaker, the arc extinguishing medium is air, but in fact the arc still has a certain conductivity in the air, so after the contacts of the low-voltage circuit breaker have been tripped and opened many times, some oxidation will occur on the surface. This will increase the contact resistance of the contacts, thereby increasing the current-carrying temperature, and the temperature rise will further accelerate the oxidation of the contacts. Such a vicious cycle will cause damage to the low-voltage circuit breaker, and even cause accidents such as fire.

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