An arc guiding and extinguishing device and a DC circuit breaker using the arc guiding and extinguishing device

Abstract

The invention discloses an arc guiding and extinguishing apparatus, as well as a DC breaker using the arc guiding and extinguishing apparatus. The arc guiding and extinguishing apparatus comprises a U-shaped motor groove and an arc extinguishing cover component which are mutually connected, wherein a U-shaped magnet yoke is arranged in a hollow cavity of the U-shaped motor groove; a magnetic material block is respectively arranged on each side of the upper sides of two sidewalls of the magnet yoke; and a reversed U-shaped magnetic path is formed by the magnetic material blocks and an arc extinguishing grid sheet in the arc extinguishing cover component. The magnetism generated by the current in a conductive circuit in the U-shaped magnet yoke and the reversed U-shaped magnetic path has a strong magnetic blowing force on the arc which is instantly generated when a movable contact and a static contact are released from contact, so as to blow the arc into the arc extinguishing cover component to extinguish the arc. With the adoption of the arc guiding and extinguishing apparatus, as well as the DC breaker using the arc guiding and extinguishing apparatus, the problem that the arc guiding effect on the arc near to the dynamic contact by the arc guiding device in the prior art is poor is solved; and the arc guiding and extinguishing apparatus, as well as the DC breaker using the arc guiding and extinguishing apparatus is excellent in arc guiding effect, strong in arc extinguishing ability, short in arc spraying distance and wide in application range for all arcs between the dynamic contact and the static contact.

Description

technical field [0001] The invention relates to an arc-guiding and arc-extinguishing device, in particular to an arc-guiding and arc-extinguishing device suitable for a DC circuit breaker. Background technique [0002] With the increasing development of industry and green energy, such as solar power generation, wind power generation and urban rail transit are changing with each passing day, and are favored by the world. In these new fields, not only various AC power supply systems are required, but also DC power supply systems and centralized power monitoring systems are required. In the DC power supply system, the DC molded case circuit breaker is one of the important components to ensure the stable, reliable and safe operation of the DC power supply system. Arcs are generated in situations such as ionization, and because there is no zero-crossing phenomenon in direct current, it is more difficult to extinguish the arc. Therefore, the arc-guiding and arc-extinguishing devi...

AI Technical Summary

Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is the problem that the arc-guiding and arc-extinguishing devices in the prior art cannot make full use of the electromotive force and thermal driving force generated under short-circuit conditions, so as to provide a Electric power and thermal driving force, have a good arc blowing effect on the arc near the moving contact and the static contact, stronger arc extinguishing ability, and a wider range of application. DC circuit breaker for the device

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