Ferromagnetic material-based longitudinal magnetic contact of vacuum arc-extinguishing chamber

Abstract

The invention discloses a vacuum arc-extinguishing chamber longitudinal magnetic contact based on a ferromagnetic material. The vacuum arc-extinguishing chamber longitudinal magnetic contact comprises a contact blade, a contact support, a contact cup, a support frame, a ferromagnetic column and a conducting rod, wherein radial grooves are uniformly formed in the contact blade and the contact support, one half of the grooves are large grooves, and the other half of the grooves are small grooves; the open groove in the contact cup rotates by 90 degrees along the cup wall to form a cup finger; the supporting frame is fixed to the center of the cup cavity and mainly plays a supporting role; cylindrical ferromagnetic materials are fixed between the supporting frame and the inner wall of the contact cup and distributed close to a notch of the contact cup, the lower end face of each cylindrical ferromagnetic material is positioned through cylindrical grooves evenly distributed in the bottom of the cup cavity, and the upper end face of each cylindrical ferromagnetic material makes contact with the lower surface of the contact support. The contact structure can improve magnetic field distribution of the cup-shaped longitudinal magnetic contact of the vacuum arc-extinguishing chamber, longitudinal magnetic field intensity of the edge of the contact is greater than that of a central area when the opening distance is small, longitudinal magnetic field distribution is relatively uniform when the opening distance is large, the residual magnetic field after current zero crossing is small, and the contact structure has the advantages of strong breaking capacity, high strength, simple structure and the like.

Description

technical field [0001] The invention belongs to the technical field of vacuum interrupters, and more specifically relates to a longitudinal magnetic contact of a vacuum interrupter based on ferromagnetic materials. Background technique [0002] In the HVDC transmission system, as an important control and protection device, the DC circuit breaker is the guarantee for the safe and reliable power supply of the HVDC transmission system. Among them, the vacuum interrupter is a key component for arc generation and extinguishment, and its breaking performance is closely related to the contact structure used. [0003] The HVDC transmission system has the characteristics of fast fault current rise and no natural zero crossing, which is the main obstacle restricting the development of HVDC technology. The DC circuit breaker based on the principle of artificial zero-crossing generates a high-frequency reverse current through the commutation branch and superimposes it on the main circu...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the existing cup-shaped longitudinal magnetic contacts, the present invention provides a ferromagnetic material-based vacuum interrupter longitudinal magnetic contact, aiming to solve the bell-shaped distribution caused by the cup-shaped longitudinal magnetic contacts in the prior art. In the longitudinal magnetic field, the diffusion of the arc in the initial stage of arcing is dominated by the inhibition effect, which leads to the problem that the control effect on the DC vacuum arc is limited; the purpose of the present invention is to make it longitudinally The magnetic field intensity is greater than the central area, and the longitudinal magnetic field distribution is relatively uniform when the opening distance is large, and the residual magnetic field is small after the current crosses zero

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