Arc extinguishing chamber for breaker

Abstract

The invention relates to an arc extinguishing chamber for a breaker. The arc extinguishing chamber comprises an arc extinguishing cover, side walls, a group of arc extinguishing grid pieces and a flame extinguishing piece, wherein the arc extinguishing cover is placed at the top of the arc extinguishing chamber; the side walls are arranged at the left aide and the right side of the arc extinguishing chamber, the group of arc extinguishing grid pieces is arranged between the left side wall and the right side wall of the arc extinguishing chamber; and the flame extinguishing piece is arranged between the arc extinguishing cover and the arc extinguishing grid piece. The arc extinguishing chamber for the breaker is characterized in that the group of the arc extinguishing grid pieces is in staggered arrangement between the side walls of the arc extinguishing chamber, the front end of the arc extinguishing grid piece at one lateral side is provided with an arc initiating piece, the included angle formed by intersecting the upper part seamed-borders of the arc extinguishing grid piece is an obtuse angle; and the intersecting position extends to an arc initiating port. Compared with prior art, the arc extinguishing chamber for the breaker can obviously improve the short circuit breaking capacity of the breaker, quickly initiate arc and effectively protect a main contact.

Description

technical field [0001] The invention relates to an arc extinguishing chamber for a low-voltage circuit breaker, in particular to a frame-type low-voltage circuit breaker. Background technique [0002] The arc extinguishing chamber is an important component of the circuit breaker, which directly affects the short-circuit performance of the circuit breaker. At present, the arc extinguishing chamber of the frame-type low-voltage circuit breaker mainly adopts the grid plate to extinguish the arc. The structure of the arc extinguishing chamber is mainly composed of arc pilot, arc extinguishing grid, flame extinguishing and arc extinguishing cover. Among them, the arc extinguishing grid is mostly composed of a group of parallel iron sheets. Its shape has a great influence on the performance of the interrupter. For AC arcs, the arc gap dielectric strength recovery theory is widely used in the industry. In order to effectively enhance the dielectric recovery ability of the arc, i...

AI Technical Summary

Problems solved by technology

Another type of arc extinguishing chamber such as ABB, GE, and Siemens series is a wide-angle arc extinguishing chamber (known technology 2), and the distance between the grid shape and the contact system is short, and its characteristics are: large short-circuit current and good heat dissipation effect , the insulation of the arc extinguishing chamber is good, the insulation is reduced after breaking, and the material cost is large

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