Influence of Current and Cathode Material on Microexplosion of Cathode Microprotrusion

IF 2.9 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Dielectrics and Electrical Insulation Pub Date : 2025-01-03 DOI:10.1109/TDEI.2025.3526086

Yingyao Zhang;Yuan Ma;Jiale Dai;Lijun Jin;Miaosong Gu

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引用次数: 0

Abstract

Microprotrusions on cathode surface might be melted and evaporated to form metal vapor and plasma in the vacuum gaps under the electron emission current caused by high electric field, which would seriously affect the vacuum insulation performance and the stability of high-voltage vacuum systems. To further study the dynamic characteristics of cathode microprotrusion under electron emission is of great importance in better understanding of the mechanism of electron emission induced vacuum breakdown. In this article, an established smoothed particle hydrodynamics (SPHs) model is used to simulate the dynamic evolution process of microexplosion phenomena of cathode microprotrusion. The dynamic characteristics of cathode microprotrusion under different current conditions and material are obtained and analyzed based on the SPH model to explore the effect of different factors on the dynamic characteristics of cathode microprotrusion under electron emission. The results show that both the current condition and the material properties would have significant influence on the dynamic characteristics of microprotrusion, such as the temperature rise, the temperature distribution, and the explosion delay time. The results of this article may provide some useful information to understand the mechanism of vacuum breakdown initiated by emission current.

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电流和正极材料对阴极微突微爆炸的影响

在高电场产生的电子发射电流作用下，阴极表面的微突起会在真空间隙中熔化蒸发形成金属蒸气和等离子体，严重影响真空绝缘性能和高压真空系统的稳定性。进一步研究电子发射下阴极微突出的动态特性，对于更好地理解电子发射诱导真空击穿的机理具有重要意义。本文利用建立的光滑粒子流体力学模型，模拟了阴极微突微爆炸现象的动态演化过程。基于SPH模型，获得并分析了不同电流条件和材料下阴极微突出的动态特性，探讨了不同因素对电子发射下阴极微突出动态特性的影响。结果表明，电流条件和材料性能对微突的动态特性，如温升、温度分布和爆炸延迟时间都有显著影响。本文的研究结果可为理解发射电流引发真空击穿的机理提供一些有用的信息。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程：电子与电气

CiteScore

6.00

自引率

22.60%

发文量

309

审稿时长

5.2 months

期刊介绍： Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.