A High Rated Current Longitudinal Magnetic Field Vacuum Interrupter Contact Structure

Abstract

The invention provides a high rated current longitudinal magnetic field vacuum arc-extinguishing chamber contact structure which comprises an anode contact system and a cathode contact system with the same structure arranged in a vacuum arc-extinguishing chamber. The anode contact system comprises a conducting rod, U-shaped iron cores and a contact piece. One end of the conducting rod passes through the openings of the U-shaped iron cores and is connected to the contact piece. The middle part of the contact piece is provided with two non-linear grooves with symmetrical shape and position, and the non-linear grooves divide the contact piece into a flow guide area between two non-linear grooves and arcing areas at the end part outer sides of the two non-linear grooves, and the flow guide area and the arcing areas are electrically connected through an electric bridge. The U-shaped iron cores are arranged at the back side of the contact piece and are in the arcing areas. The anode contact system and the cathode contact system are arranged to face each other, and the opening directions of the U-shaped iron cores are arranged in a 180-degree staggered way. According to the high rated current longitudinal magnetic field vacuum arc-extinguishing chamber contact structure, the eddy current loss in the contact piece can be greatly reduced, the loop resistance of a vacuum arc-extinguishing chamber is reduced, and the area of a strong longitudinal magnetic field is increased while the longitudinal magnetic field between contacts is improved.

Description

technical field [0001] The invention belongs to the technical field of vacuum switches, in particular to a contact structure of a high rated current longitudinal magnetic field vacuum interrupter. Background technique [0002] Due to its simple structure, maintenance-free and environmental friendliness, the vacuum interrupter is developing towards the transmission level. Rated current boosting technology and high-current vacuum arc magnetic field control technology are key technologies that need to be solved urgently for transmission-grade vacuum interrupters. At present, in the design of transmission-level vacuum interrupters, the vacuum arc is usually controlled by applying a magnetic field in the vacuum interrupter, while reducing the loop resistance of the vacuum interrupter as much as possible. In the prior art, a horseshoe-type longitudinal magnetic contact has a smaller loop resistance than a coil-type longitudinal magnetic contact and can provide a stronger longitud...

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Problems solved by technology

However, in the existing horseshoe-type longitudinal magnetic contacts of the vacuum interrupter, the contact piece will generate a strong eddy current when passing through the current, which will greatly increase the AC circuit resistance of the vacuum interrupter, which is not conducive to the high rating of the vacuum interrupter. The temperature rise control under the current limits the increase of the rated current capacity of the horseshoe-type longitudinal magnetic contact vacuum interrupter

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