Title :
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
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;
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
DOI :
10.1109/ICPADM.2009.5252178
