A DC circuit breaker

Abstract

The present invention provides a DC circuit breaker. The arc extinguishing chamber is installed on the second casing and has a side opening opposite to the first casing. The gas-generating plate and the baffle plate, the baffle plate is opposite to the side opening and set close to the second housing, the static and dynamic contacts are installed inside the installation space, and the breaking point is located inside the accommodation space and close to the baffle plate; when the static and dynamic contacts are broken, an arc is generated When the gas generating plate and the shielding plate are triggered by the arc, a large amount of gas is generated to push the arc to move away from the shielding plate; the arc extinguishing grid installed on the upper side of the arc extinguishing chamber is provided with a lower opening on the side facing the accommodation space, and the lower opening The size of the arc gradually decreases along the direction from the second shell to the first shell. During the moving process, the arc is constantly blocked by the arc extinguishing grid with a smaller opening at the lower part, so that it cannot rush from the side opening of the arc extinguishing chamber. out, but can only enter the space between the arc extinguishing grids to extinguish as soon as possible.

Description

technical field [0001] The invention relates to the technical field of DC circuit breakers, in particular to a DC circuit breaker. Background technique [0002] Low-voltage circuit breaker is an important power transmission and distribution electrical component, which plays an important role in distributing electric energy and protecting equipment and personnel safety in the line. Low-voltage circuit breakers can be divided into AC circuit breakers and DC circuit breakers according to their use systems. Under normal working conditions, the low-voltage circuit breaker realizes the distribution and control of the electrical load by closing or opening the contacts. When a fault occurs in the line, the circuit breaker detects the fault signal, and the release operates to break the contacts and disconnect the faulty line. When a short-circuit fault occurs in the line, when breaking the short-circuit current, quickly extinguishing the arc is an important condition to ensure the ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the DC circuit breaker in the prior art adds a baffle plate between the first housing and the upper port of the arc extinguishing chamber, which shortens the moving distance of the arc in the arc extinguishing chamber, which in turn leads to Most of the arc extinguishing grids cannot be fully utilized, so that the arc is not easy to extinguish and the moving and static contacts are difficult to break, so as to provide a method that can not only protect the shell, but also make full use of most of the arc extinguishing grids to improve the arc extinguishing effect, and DC circuit breaker with easy breaking of moving and static contacts

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