DC circuit breaker arc extinguishing chamber

Abstract

The present invention provides a DC circuit breaker arc extinguishing chamber which comprises a shell with a mounting inner cavity and a plurality of metal gates which are installed in the mounting inner cavity side by side. An arc extinguishing space with two through ends is formed between any two adjacent metal gates. The shell also comprises a containing inner cavity for containing DC circuit breaker moving and static contacts, and the containing inner cavity communicates with one end of the arc extinguishing space. The shell side wall which forms the containing inner cavity is also provided with a first magnetic shield plate for shielding a magnetic field. When the moving and static contacts of the DC circuit breaker are disconnected to generate an electric arc, the first magnetic shield plate can protect the electric arc from being interrupted by an external magnetic field, the magnetic field generated at moving and static contact positions is gathered in the containing inner cavity such that the electric arc is rapidly and stably driven to the metal gates to extinguish the arc under the effect of the magnetic field generated at moving and static contact positions, and thus the stability of arc extinguishment is improved.

Description

technical field [0001] The invention relates to the technical field of circuit breaker arc extinguishing devices, in particular to an arc extinguishing chamber of a DC circuit breaker. Background technique [0002] With the continuous development of the national economy, the DC power transmission and distribution system in the power system has also developed rapidly. For example, urban rail transit, solar energy, high-speed rail and other fields have adopted DC power supply systems. For the protection and control of DC power supply systems The safety performance and working reliability of DC circuit breakers put forward higher requirements. [0003] As we all know, the static and dynamic contacts of DC circuit breakers will generate arcs when breaking the fault current, normal working current and critical current, especially in the case of breaking large short-circuit currents, if the arc cannot be reliably extinguished, it will not only cause damage to the circuit breaker i...

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the complex structure of the magnetic blowing arc extinguishing device of the DC circuit breaker in the prior art, and the external magnetic field is likely to cause interference to the arc extinguishing chamber, resulting in weakening of the magnetic field, thereby making the arc extinguishing unstable and extinguishing The technical defect of slowing down the arc speed, thus providing a DC circuit breaker arc extinguishing chamber with a simple structure, and will not be disturbed by the external magnetic field, so the arc is extinguished stably and quickly

Images