A DC circuit breaker based on double-coil monostable permanent magnet mechanism

Abstract

The invention relates to the technical field of the high-voltage device, and discloses a DC breaker based on a dual-coil monostable permanent magnet mechanism. The DC breaker comprises a vacuum arc-extinguishing chamber; a static contact and a movable contact are arranged in the vacuum arc-extinguishing chamber from top to bottom, the bottom surface of the movable contact is connected with a movable conducting rod; the movable conducting rod is connected with a dual-coil repulsion mechanism through a spring steering mechanism, the dual-coil repulsion mechanism is connected with a permanent magnet mechanism through a switch-off maintaining spring, and a switch-off buffer is arranged below the permanent magnet mechanism; the switch-off maintaining spring is used for providing the switch-offmaintaining force, the permanent magnet mechanism is used for providing a switch-on maintaining force, the spring steering mechanism is used for providing the switch-on assisting force in the switch-on, thereby increasing the contact pressure of the movable contact and the static contact; the dual-coil repulsion mechanism is used for providing the starting acting force of the switch-off and the starting acting force of the switch-on through the electromagnetic induction; and the switch-off buffer is used for absorbing excessive kinetic energy in the switch-off process. The DC breaker disclosedby the invention is simple and reliable, convenient for application, and has good in market promotional value.

Description

technical field [0001] The invention relates to the technical field of high-voltage devices, in particular to a DC circuit breaker based on a double-coil monostable permanent magnet mechanism. Background technique [0002] Vacuum interrupter-type DC circuit breakers generally adopt disc spring holding and bistable spring holding structures. Under the working condition of fast opening and closing of DC circuit breakers, the springs do more work, which will cause large deformation of the dynamic and static contacts, resulting in vacuum The closing position of the moving contact of the arc extinguishing chamber and the electromagnetic repulsion mechanism changes, and a change of one millimeter in the closing position will cause a difference of about 10% in the electromagnetic repulsion force, which affects the consistency of a single DC circuit breaker and multiple DC circuit breakers The synchronism of the switch will have a greater impact, and it will also provide higher requ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a DC circuit breaker based on a double-coil monostable permanent magnet mechanism, which solves the problem that the closing of the DC circuit breaker adopting a disc spring holding structure and a bistable spring holding structure causes a relatively high speed at the just closing point, causing dynamic and static contact The head pier is seriously thick, the closing bounce is too large, and the contact ablation is serious, etc.

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