Active overvoltage protection gap with plug-in function in vacuum environment

Abstract

An active overvoltage protection gap with a plug-and-pull function in vacuum environment, includes vacuum degree of 10<-1> - 10<-5> pa, an upper electrode is arrange in that cavity, a discharge gap formed between the annular intermediate electrodes, a disk-shaped trigger electrode is mounted in the cavity, Between that trig electrode and the intermediate electrode, an annular insulating dielectricmaterial is arrange, a surface flashover discharge interface is for between that trigger electrode, the surface insulating dielectric material and the intermediate electrode to form an active overvoltage protection gap, and the surface flashover discharge interface is perpendicular to or at an acute angle with the low surface of the intermediate electrode, and a shielding cover is arranged in anupper insulating shell around the upper electrode and the intermediate electrode. The upper electrode, the middle electrode and the trigger electrode all extend out of the plug connected with the external electricity, so that the active overvoltage protection gap of the invention has the insertion and extraction function. The invention can reduce the pulse breakdown voltage of the overvoltage protection gap, and has the characteristics of extremely fast response, strong power frequency freewheeling suppression ability and longer service life.

Description

technical field [0001] The invention relates to a high-performance overvoltage protection gap in the field of electronics and communication, in particular to an active overvoltage protection gap with a plug-in function in a vacuum environment. Background technique [0002] High-performance overvoltage protection gap is a key overvoltage protection device for electronics and communications. Most of the active overvoltage protection gaps used for overvoltage protection at home and abroad adopt field-induced triggering or field distortion triggering, making the active overvoltage protection gap The voltage protection level is generally not too high, and the voltage ratio between the pulse breakdown voltage and the DC breakdown voltage is generally greater than 1, around 1.1 to 1.5. Invention patent ZL 2006 1 0104775.9 discloses an overvoltage protection device with surface flashover in a vacuum environment. Its technical feature is that there are two grooves on the surface of t...

AI Technical Summary

Problems solved by technology

Invention patent ZL 2006 1 0104775.9 discloses an overvoltage protection device with surface flashover in a vacuum environment. Its technical feature is that there are two grooves on the surface of the two main electrode contacts of the overvoltage protection gap. There are flashover rods installed in the two grooves. When lightning overvoltage occurs, the main electrode of the overvoltage protection gap discharges the energy of the lightning current through the flashover rod along the surface, but it also causes surface pollution and consumption of the flashover rod along the surface. , which will affect the service life of the overvoltage protection gap. More importantly, the existence of flashover rods along the surface cannot reduce the voltage ratio of the overvoltage protection gap. In the overvoltage protection gap, the pulse breakdown voltage decreases and the voltage protection level At the same time as the improvement, the DC breakdown voltage of the overvoltage protection gap is also reduced, and the safety of normal operation is reduced. Therefore, the performance improvement of the overvoltage protection gap is limited

At present, the overvoltage protection gap cannot meet the above requirements, and its performance indicators still need to be improved

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