Vacuum arc-extinguishing chamber and arc-extinguishing contact thereof

Abstract

The invention relates to a vacuum arc-extinguishing chamber and an arc-extinguishing contact thereof. The arc extinguishing contact comprises a conducting rod, a contact blade and longitudinal magnetic conductors; a plurality of longitudinal magnetic conductors are arranged, the longitudinal magnetic conductors rotate and extend in the axial direction of the conducting rod in the circumferential direction of the contact piece, and the longitudinal magnetic conductors are arranged at intervals in the circumferential direction of the contact piece, and the rotation directions of the longitudinal magnetic conductors are consistent; the longitudinal magnetic conductor is provided with a conductor contact section which is used for being in compression contact with the longitudinal magnetic conductor circumferentially adjacent to the contact blade along the axial direction of the conducting rod; and the adjacent conductor contact sections on the arc extinguishing contact are in contact during flow passage, so that the flow passage path is shortened, the flow passage resistance is reduced, and the flow passage capacity is improved, and during breaking, the longitudinal magnetic conductors are reset, the intervals between the adjacent longitudinal magnetic conductors prevent flow passage, the flow passage path is limited on the extension paths of the longitudinal magnetic conductors, and the longitudinal magnetic conductors rotate and extend, so the arc extinguishing contact can ensure the longitudinal magnetic field intensity. According to the arc extinguishing contact, by changing a current path, the longitudinal magnetic field intensity is ensured, and meanwhile, the through-current capability is improved.

Description

technical field [0001] The invention relates to a vacuum interrupter and an arc-extinguishing contact thereof. Background technique [0002] Vacuum circuit breakers are currently widely used in the interruption of AC power grids in the medium and low voltage fields. They have the characteristics of high reliability, maintenance-free, and strong breaking capacity. Among them, the vacuum interrupter is the core device related to whether the vacuum circuit breaker can successfully break the fault current. [0003] Arcing occurs during the breaking process of the dynamic and static contacts in the vacuum interrupter, and the metal vapor in the arcing process burns to form an arc. The contraction of the arc under high current will reduce the recovery strength of the post-arc insulating medium inside the vacuum interrupter, which is not conducive to The vacuum circuit breaker tripped. At present, the method of improving arc control generally adopts the longitudinal magnetic fiel...

AI Technical Summary

Problems solved by technology

[0003] Arcing occurs during the breaking process of the dynamic and static contacts in the vacuum interrupter, and the metal vapor in the arcing process burns to form an arc. The contraction of the arc under high current will reduce the recovery strength of the post-arc insulating medium inside the vacuum interrupter, which is not conducive to Vacuum circuit breaker opening

At present, the method of improving arc control generally adopts the longitudinal magnetic field control technology. The vacuum arc can be maintained in a diffuse state under the action of the longitudinal magnetic field to reduce the ablation of the arc to the contact. There are contradictions between them. When the longitudinal magnetic field strength is large, the current path of the contact is longer, the resistance is larger, and the current flow capacity is poor. When the current flow path is short, the current flow capacity is stronger, but the longitudinal magnetic field strength is smaller.

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