Title :
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
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;
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
DOI :
10.1109/ICPADM.2006.284127
