Insulation Analysis of a Coaxial High-Voltage Vacuum Insulator

Author

Zhao, Liang ; Peng, Jian-chang ; Pan, Ya-feng ; Zhang, Xi-bo ; Su, Jian-cang

Author_Institution

Key Lab. for Phys. Electron. & Devices of the Minist. of Educ., Xi´´an Jiaotong Univ., Xi´´an, China

Volume

38

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

1369

Lastpage

1374

Abstract

Insulation of a coaxial high-voltage vacuum insulator used in the pulsed power generator TPG700 has been studied in this paper. When output voltage is increased from 700 to 800 kV, breakdown happens in the insulator. With transient simulation, the region of the insulator subject to the highest electric strength is concluded. According to the experimental and simulated results, the breakdown strength has been calculated. An electric-thermal model has been proposed in which factors such as local electric field (E-field) enhancement, imperfection in dielectric, and repetition working state are analyzed. A formula to calculate the effects of these factors is suggested. Moreover, the key structures on the coaxial line which influence the E-field distribution are optimized, and useful advice for designing an insulator of this kind is presented.

Keywords

coaxial cables; electric breakdown; pulsed power supplies; vacuum insulation; E-field distribution; breakdown strength; coaxial high-voltage vacuum insulator; coaxial line; electric-thermal model; insulation analysis; local electric field enhancement; pulsed power generator; repetition working state; transient simulation; voltage 700 kV to 800 kV; Bulk breakdown; electric field (E-field) distribution; flashover; vacuum insulator;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/TPS.2010.2040489

Filename

5422635