Surface flashover performance of alumina insulators at high voltage microsecond pulses in vacuum

被引：0

作者：

Xiang, W. ^{[1
]}

Lei, Y. J. ^{[1
]}

Cheng, Y. L. ^{[1
]}

机构：

[1] China Acad Engn Phys, Inst Elect Engn, Mianyang 621900, Sichuan, Peoples R China

来源：

2009 IEEE INTERNATIONAL VACUUM ELECTRONICS CONFERENCE | 2009年

关键词：

Vacuum; pulsed high voltage; alumina insulators; flashover hold-off voltage;

D O I：

10.1109/IVELEC.2009.5193580

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The surface flashover performance of insulators is the critical factor strongly influencing the voltage hold-off capability of high voltage vacuum devices. Based upon the simulations of electric fields, the influences of residual gas pressure, alumina insulator materias and cathode electrode geometries on the pulsed flashover performances of the hollowly cylindrical alumina insulators are experimentally studied under the condition of the single high-voltage microsecond pulses. The results indicate that the flashover voltage of the alumina insulators is independent on the residual gas pressure below 10(-1) Pa. The flashover voltage of the 94% Al2O3 insulators doped with Cr2O3 is almost 30% higher than that of the 95% Al2O3 insulators. The pulsed flashover voltage of alumina insulators can be raised significantly because the reasonable metal electrode geometry can reduce the cathode-triple-junction fields of the ceramics insulators.

引用

页码：405 / 406

页数：2

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