Multi-gap vacuum switch based on plasma jet triggering

Abstract

The invention relates to a multi-gap vacuum switch based on plasma jet triggering, which comprises a plurality of electrodes with central openings, an intermediate electrode internally equipped with electric spark discharge plasma jet, insulating supports, ring-shaped voltage sharing ceramic capacitors, shielding covers, an insulating sleeve and a high-voltage pulse triggering and freewheeling circuit. The electrodes with central openings and the intermediate electrode internally equipped with electric spark discharge plasma jet constitute a plurality of vacuum gaps connected in series. The intermediate electrode internally equipped with electric spark discharge plasma jet is internally composed of upper and lower plasma jet nozzles, a discharge sphere gap provided with a low-boiling-pointsolid material inside and provided with a gas hole in the center, and a plasma chamber. The plasma jet of the invention adopts a freewheeling circuit to produce more abundant plasmas. Through the propulsion of the gasification of the low-boiling-point solid material, the height of the plasma nozzles is increased, and the reliability of the trigger system is improved. Through series connection ofa plurality of vacuum gaps, the voltage level of the switch is improved.

Description

technical field [0001] The invention relates to a high-voltage pulse power multi-gap vacuum switch, in particular to a multi-gap vacuum switch triggered by plasma jetting. Background technique [0002] In recent years, with the development of pulse power switches, gas trigger switches and vacuum trigger switches are two commonly used pulse power switches. Gas trigger switches have high dielectric strength, and vacuum trigger switches have fast dynamic medium recovery speed, but long gaps There is a saturation effect under the environment, and the use of multiple vacuum gaps in series can give full play to the superior arc extinguishing performance of vacuum short gaps, and is more suitable for high repetition frequency pulse power applications. Common triggering methods include electric spark triggering, laser triggering, X-ray triggering, etc. The traditional spark triggering has high requirements for the working system in the case of long gaps, generally higher than 50%, a...

AI Technical Summary

Problems solved by technology

Common triggering methods include electric spark triggering, laser triggering, X-ray triggering, etc. The traditional spark triggering has high requirements for the working system in the case of long gaps, generally higher than 50%, and the working range is narrow. The multi-gap gas trigger switch adopts the main Gap trigger breakdown, other gap self-breakdown methods, trigger conduction reliability is poor, and the working range is narrow; in addition, under high repetition frequency, the dynamic dielectric recovery speed of the gas switch is slow, that is, it needs to last longer after the previous discharge. Time to apply the next pulse discharge, not suitable for high repetition frequency occasions

[0003] At present, the research on plasma jet switch is mainly aimed at the switch of a single gap. The plasma jet is driven by the expansion effect generated by the arc discharge itself. The jet height is limited, and it is not suitable for the triggering of long gap or multi-gap switches.

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