Surface flashover characteristics in vacuum of ZnO Varistor+Al2O3 Ceramic+ZnO Varistor Insulators

Author

Li, Shengtao ; Zhang, Tuo ; Sun, Jian ; Zhang, Yunxia ; Ni, Fengyan ; Li, Weiwei

Author_Institution

State Key Lab. of Electr. Insulation & Power Equip., Xi´´an Jiaotong Univ., Xi´´an, China

fYear

2009

fDate

19-23 July 2009

Firstpage

808

Lastpage

811

Abstract

In this paper, ZnO varistor+Al₂O₃ ceramic+ZnO varistor insulators were made, in which the conductivity and permittivity of ZnO varistors were controlled by changing its voltage gradient. Then the influences of conductivity and permittivity of ZnO varistors on the DC and pulsed surface flashover voltage in vacuum were experimentally investigated. The experimental results indicated that the DC and pulsed surface flashover voltage of the three-layer insulators will be increased obviously while the conductivity and permittivity of ZnO varistors have been controlled within a certain range.

Keywords

alumina; ceramic insulators; electrical conductivity; flashover; permittivity; vacuum apparatus; varistors; zinc compounds; DC flashover voltage; ZnO-Al₂O₃; electric conductivity; permittivity; pulsed surface flashover voltage; surface flashover characteristics; three-layer insulator; varistor ceramic; varistor insulator; voltage gradient; Conductivity; Dielectric devices; Dielectric materials; Dielectrics and electrical insulation; Electron emission; Flashover; Permittivity; Varistors; Voltage control; Zinc oxide; ZnO Varistors; electric field distribution; surface flashover in vacuum; triple junction;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 2009. ICPADM 2009. IEEE 9th International Conference on the

Conference_Location

Harbin

Print_ISBN

978-1-4244-4367-3

Electronic_ISBN

978-1-4244-4368-0

Type

conf

DOI

10.1109/ICPADM.2009.5252178

Filename

5252178