Device and method for improving through-flow arc control of high-voltage large-capacity gas gap switch

By introducing a trigger cavity and spiral groove structure into a high-voltage, high-capacity gas gap switch, the arc movement is stabilized and quickly extinguished, solving the problem of electrode ablation under high-energy fault current. This improves the reliability and economy of the device and makes it suitable for rapid fault isolation in flexible DC transmission systems and traditional power systems.

CN122051785APending Publication Date: 2026-05-15STATE GRID ANHUI ELECTRIC POWER CO LTD BOZHOU POWER SUPPLY CO
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Patent Information

Application Number
CN202610361985.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-24
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

When handling high-energy fault currents, high-voltage, high-capacity gas gap switches are prone to arc plasma drift, contraction, or diffusion, leading to localized overheating and ablation of the electrodes, resulting in reduced lifespan and failing to meet the demands of modern power grids for equipment reliability, economy, and long lifespan.

Method used

The device design employs a trigger cavity and a spiral groove to control the arc. A high-voltage pulse triggers the plasma jet, which induces the breakdown of the main gap and constrains the arc movement within the spiral groove. Combined with a transverse magnetic field and a well-designed gas medium, it achieves arc stability and rapid extinguishing.

Benefits of technology

It significantly reduces electrode erosion, extends current-carrying life, meets the timing requirements of fast mechanical switching, reduces costs, and is suitable for rapid energy dissipation in flexible DC transmission systems and rapid fault isolation in traditional power systems.

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Abstract

The invention relates to a device for improving the through-flow arc control of a high-voltage large-capacity gas gap switch, and the device comprises a test cavity which is used for providing a controllable gas insulation environment and serves as a carrier of a high-voltage large-current discharge test; the trigger discharge loop is used for generating a high-voltage pulse to drive the trigger cavity to generate plasma jet and induce the main gap to be broken down and conducted at a preset moment; and the large current generation loop is used for storing energy and generating a high-energy fault current simulating an actual working condition after the main gap is conducted. A main gap can form a stable and controllable initial discharge channel under high-voltage and large-gap conditions, active constraint is carried out on an arc movement track in a high-energy fault current flowing stage, and long-term residence of an arc root in a local area of an electrode is avoided, so that the ablation degree of the electrode is remarkably reduced, the through-flow life is prolonged, and meanwhile, the service life of the electrode is prolonged. A transverse magnetic field generated by the spiral groove structure enables an electric arc to rotate along the surface of the electrode, the stability of an arc column is effectively improved, and the reliability under the condition of large current flow is improved.
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