DC circuit breaker arc-extinguishing system

Abstract

The invention relates to a DC circuit breaker arc-extinguishing system. The system comprises a static contact, an arc-extinguishing cover arranged on the static contact, and a moving contact which isin linkage fit with an operating mechanism and rotates relative to the static contact. At least one strip-shaped permanent magnet is arranged at the position, corresponding to a static contact of thestatic contact, of the arc-extinguishing cover, and the strip-shaped permanent magnet is transversely arranged on the arc extinguishing cover in a penetrating mode, and a magnetic induction line of the strip-shaped permanent magnet is perpendicular to the plane formed by the opening and closing action track of the moving contact. The system is simple in structure, has stable and reliable performances, is good in arc-extinguishing effect, can achieve the high breaking, and is long in service life.

Description

technical field [0001] The invention relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing system for a DC circuit breaker. Background technique [0002] A circuit breaker is a switching device that can carry and break current under normal circuit conditions, and can also carry and break current under abnormal circuit conditions within a specified time. With the development of new energy technology, more and more DC circuit breakers are used. With the increase of operating voltage, the market puts forward higher requirements for the reliable breaking performance of circuit breakers, and the difficulty of critical breaking will increase significantly. There have been technical means such as extending the arc by increasing the opening distance, promoting and cooling the arc by burning gas-producing materials, and promoting the arc by increasing the magnetic field, but these methods cannot be used in the case of high DC volta...

AI Technical Summary

Problems solved by technology

There have been technical means such as extending the arc by increasing the opening distance, promoting and cooling the arc by burning gas-producing materials, and promoting the arc by increasing the magnetic field, but these methods cannot be used in the case of high DC voltage and limited volume. reliable breaking circuit

In the technical scheme of enhancing the magnetic field, the magnetic field in the arc-starting area is enhanced by adding permanent magnets, which generates a thrust on the arc and pushes the arc to the arc-extinguishing grid; the structure design of the existing arc-extinguishing system using permanent magnets is unreasonable. The magnetic circuit connection line of the permanent magnet of the arc extinguishing system is parallel to the plane formed by the rotation of the moving contact, and the magnetic field cannot cut the arc. When breaking a large current, the arc extinguishing effect is not ideal, thereby reducing the service life of the short circuit.

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