A 2/4-Turn Coil Type Longitudinal Magnetic Contact Structure and Its Application Vacuum Interrupter

Abstract

The utility model relates to a two-quarter-turn coil-type longitudinal magnetic contact structure and a vacuum arc-extinguishing chamber applying the same. The contact structure comprises a static contact and a moving contact which are oppositely arranged; the static contact comprises a static conducting rod, a static side two-quarter-turn longitudinal magnetic coil, a static supporting seat and a static contact piece; the static side two-quarter-turn longitudinal magnetic coil is arranged at the bottom of the static conducting rod, is of a double-layer structure and is provided with four parallel branches; the tail ends of the branches are welded with the static contact piece, and four linear grooves are formed in the static contact piece so as to reduce eddy current; and a static supporting seat is arranged on the back surface of the static contact piece; the moving contact and the static contact are the same in structure, and the contact pieces are oppositely arranged. The structure is applied to the vacuum arc extinguish chamber. Compared with an existing contact structure, the structure greatly reduces the resistance of a contact system reduced under the condition that a certain magnetic field intensity is guaranteed, and improves the rated through-flow capacity of the arc extinguish chamber.

Description

technical field [0001] The invention belongs to the technical field of vacuum switches, and in particular relates to a 2 / 4-turn coil type longitudinal magnetic contact structure and a vacuum interrupter for its application. Background technique [0002] The vacuum interrupter is environmentally friendly and maintenance-free, and has been widely used in medium-voltage switchgear. When the vacuum interrupter is applied to high-voltage switchgear, it is mainly necessary to realize reliable breaking under high current and temperature rise control under high rated current. In high-voltage vacuum interrupters, longitudinal magnetic contacts are usually used to control the arc. On the one hand, it can maintain the arc in a diffuse state and realize breaking of large currents; on the other hand, the longitudinal magnetic contacts are suitable for large opening distances. A high level of insulation can be guaranteed. The coil type longitudinal magnetic contact is one of the most co...

AI Technical Summary

Problems solved by technology

The coil type longitudinal magnetic contact is one of the most commonly used ones. It has a coil structure and can generate a strong longitudinal magnetic field. However, due to the long current path, the resistance of the contact system is relatively large, which limits the increase of the rated current level of the vacuum interrupter.

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