A longitudinal magnetic contact for vacuum interrupter based on ferromagnetic material

Abstract

The invention discloses a longitudinal magnetic contact of a vacuum interrupter based on a ferromagnetic material, comprising a contact piece, a contact holder, a contact cup, a support frame, a ferromagnetic column and a conductive rod; the contact piece and the contact holder There are radial grooves evenly on the top, half of which are large grooves and half of which are small grooves; the grooves on the contact cup rotate 90° along the cup wall to form cup fingers; the support frame is fixed in the center of the cup cavity and mainly plays a supporting role ; The cylindrical ferromagnetic material is fixed between the support frame and the inner wall of the contact cup, and is distributed near the notch of the contact cup. contact with the lower surface. The contact structure can improve the magnetic field distribution of the cup-shaped longitudinal magnetic contact in the vacuum interrupter. When the opening distance is small, the longitudinal magnetic field intensity at the edge of the contact is greater than that in the central area. When the opening distance is large, the longitudinal magnetic field distribution is relatively uniform. The magnetic field is small, and it has the advantages of strong breaking capacity, high strength and simple structure.

Description

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

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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