Influence of Surface Resistivity on Flashover Properties of Epoxy Insulator in Arc-decomposed SF6 Gas

Author

Miyashita, M. ; Minagawa, T. ; Inami, K. ; Itoh, H. ; Koyama, H. ; Nagao, E.

Author_Institution

Transmission & Distribution Syst. Center, Mitsubishi Electr. Co. Ltd., Hyogo

fYear

2006

fDate

38869

Firstpage

99

Lastpage

102

Abstract

This paper studies the relation between AC surface flashover voltages (FOVs) of an epoxy insulator and the surface resistivity in arc-decomposed SF6 gas. It was found that as lowering the surface resistivity the FOV decreased and approached a constant value below the surface resistivity 109 ohm/square. The FOV characteristics and the discharge traces suggest that the flashover phenomena are divided into three regions depending on the surface resistivity, which can be explained by a transition from a capacitive field to a resistive field of the insulator and also by the surface non-uniform deterioration due to the arc-decomposed gas.

Keywords

SF₆ insulation; arcs (electric); epoxy insulators; flashover; insulator testing; surface resistance; AC surface flashover voltages; SF₆; arc-decomposed gas; capacitive field; discharge traces; epoxy insulator; flashover properties; resistive field; surface nonuniform deterioration; surface resistivity; Conductivity; Dielectrics and electrical insulation; Electrodes; Flashover; Gas insulation; Sulfur hexafluoride; Surface contamination; Surface discharges; Surface resistance; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and applications of Dielectric Materials, 2006. 8th International Conference on

Conference_Location

Bali, Indonesia

Print_ISBN

1-4244-0189-5

Electronic_ISBN

1-4244-0190-9

Type

conf

DOI

10.1109/ICPADM.2006.284127

Filename

4062616