Composite vacuum switchgear

By connecting a vacuum mechanical switch and a vacuum gap switch in parallel within a vacuum switchgear and using longitudinal and transverse magnetic fields to control the electric arc, the problem of insufficient breaking capacity of vacuum switches under DC conditions is solved. This achieves uniform arc distribution and rapid recovery of the post-arc medium, thereby improving the overall performance of the switchgear.

CN122224718APending Publication Date: 2026-06-16TSINGHUA UNIVERSITY +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIVERSITY
Filing Date
2026-04-17
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Vacuum switches have short arcing time and limited contact opening distance under DC conditions, resulting in uneven arc distribution, which affects breaking capacity and post-arc dielectric recovery capacity, and cannot fully utilize the breaking performance of vacuum switches.

Method used

A composite vacuum switch is used, which combines a vacuum mechanical switch and a vacuum gap switch in parallel. The arc is controlled by longitudinal and transverse magnetic fields, and a vacuum gap switch is formed by plasma medium, so as to achieve rapid conduction and rapid recovery of the medium after the arc.

Benefits of technology

It improves the breaking capacity and overall performance of vacuum switchgear under fault conditions, avoids arc accumulation, ensures rapid recovery of the post-arc medium, and enhances the uniformity of arc distribution and the reliability of the switch.

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Abstract

The application discloses a composite vacuum switch device, which comprises a main circuit assembly, a main switch device in a vacuum environment, the main switch device comprising two relatively movable main switch contacts to form a vacuum mechanical switch; and a commutation circuit assembly connected in parallel to the main circuit assembly, the commutation circuit assembly comprising a commutation switch device in a vacuum environment, the commutation switch device comprising two spaced-apart commutation switch contacts, the two commutation switch contacts being capable of triggering to generate a plasma medium to form a vacuum gap switch, and a transverse magnetic field being arranged between the two commutation switch contacts. The composite vacuum switch device is aimed at ensuring that the vacuum switch device can fully exert the breaking capacity, thereby improving the overall switching performance of the vacuum switch device.
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