A large-opening vacuum circuit breaker mechanism and a working method thereof

By designing a vacuum circuit breaker mechanism that includes a transmission rod, a permanent magnet, a coil, and a buffer, the speed of the transmission rod is controlled by the repulsive force between the permanent magnet and the coil. This solves the problem of arc control during the breaking process of a long-pitch vacuum circuit breaker, achieves fast breaking and adjustable stroke curve, and improves breaking capacity.

CN115692094BActive Publication Date: 2026-07-24GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Patent Information

Application Number
CN202211472911.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-17
Publication Date
2026-07-24
Estimated Expiration
2042-11-17

AI Technical Summary

Technical Problem

During the breaking process, the self-generated magnetic field control effect of the contacts of long-distance vacuum circuit breakers is weakened, making it difficult to effectively control arc combustion and leading to breaking failure.

Method used

A large-pitch vacuum circuit breaker mechanism is adopted, including a transmission rod, a permanent magnet, a coil, a frame, a buffer, a fixing component, and a spring. The transmission rod is driven to open by the spring, and the permanent magnet and the coil cooperate to generate a repulsive force to regulate the speed of the transmission rod, so as to realize the adjustable stroke curve and ensure the effective extinction of the electric arc.

Benefits of technology

It achieves rapid breaking and adjustable stroke curve of vacuum circuit breaker, improves breaking capacity under long opening distance conditions at high voltage level, reduces tripping bounce, and improves arc control effect.

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    Figure CN115692094B_ABST
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Abstract

The application relates to a large-opening-distance vacuum circuit breaker mechanism which comprises a transmission rod, a permanent magnet, a coil, a frame, a buffer, a fixing component and a spring, one end of the spring is fixed at the bottom of the frame, the other end of the spring is fixedly connected with one end of the transmission rod, the other end of the transmission rod extends towards the top end of the frame, the transmission rod and the frame are slidingly connected; the fixing component is fixedly connected with the transmission rod, the fixing component is located in the frame, the buffer is installed on the fixing component, and the buffer end of the buffer is arranged towards the bottom of the frame; the coil is fixedly connected with the frame, the coil is sleeved outside the transmission rod, the transmission rod and the coil are slidingly connected, and the permanent magnet is fixedly connected with the transmission rod. The application also relates to a working method of the large-opening-distance vacuum circuit breaker mechanism. The application can realize rapid opening of the vacuum circuit breaker, and can also realize the effect of adjustable stroke curve of the transmission rod, and belongs to the technical field of vacuum circuit breakers.
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Citation Information

Patent Citations

  • Failure operation prevention permanent-magnet operating mechanism

    CN104934258A

  • Moving permanent magnetic actuator

    CN2671104Y