Improved structure of circuit breaker contact arc extinguishing system

Abstract

The invention relates to an improved structure of a circuit breaker contact arc extinguishing system, which comprises an arc extinguishing chamber (1), a moving contact (2) and a static contact (3), wherein the moving contact (2) and the static contact (3) are mutually coordinated. The improved structure is characterized in that feet (101a) of an arc extinguishing grid plate group (101) of the arcextinguishing chamber (1) are wrapped by a first gas producing hood (4), the first gas producing hood (4) is provided with narrow slots (401) at the parts corresponding to the arc extinguishing gridplates of the arc extinguishing grid plate group (101) so as to increase the gas producing area and extend the arc at the same time. The improved structure is additionally provided with the narrow slots on the first gas producing hood (4) so as to increase the gas producing area and extend the arc at the same time, thereby shortening the extinguishing time of the arc after being cooled by the arcextinguishing grid plates, and thus improving the breaking performance.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an improved structure of a circuit breaker contact arc extinguishing system. Background technique [0002] Circuit breakers are an important part of power distribution appliances. They are used in industrial low-voltage power systems to switch on and off the current in the grid circuit and to protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding, etc. hazard of failure. The function of the circuit breaker to break the overload or short-circuit current is mainly completed by the arc extinguishing system installed in the circuit breaker. When a fault current occurs in the circuit and the current value exceeds the protection range set by the intelligent controller, the operating mechanism is driven to make the dynamic and static contacts of the circuit breaker disconnect quickly. At this time, the voltage between t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an improved structure of the circuit breaker contact arc extinguishing system for the existing low-voltage circuit breaker contact arc extinguishing system, which is prone to arc escape and cause arc discharge short circuit. The improvement of the structure of the contact arc extinguishing system, adding narrow slits on the gas production cover to increase the gas production area while elongating the arc, shortens the time for the arc to be extinguished after being cooled by the arc extinguishing grid, thereby improving the segmental performance

Images