Composite insulation technology for new compact 72/84 kV C-GIS

Author

Sato, J. ; Shiori, T. ; Miyagawa, M. ; Yoshida, T. ; Yokokura, K.

Author_Institution

Toshiba Corp., Tokyo, Japan

Volume

2

fYear

1999

fDate

11-16 Apr 1999

Firstpage

489

Abstract

This paper presents a composite insulation technology for a new compact 72/84 kV C-GIS-cubicle type gas insulated switchgear. The dielectric characteristics of a composite insulation structure composed of low-pressure SF₆ and epoxy are shown. It is clarified that this structure is effective in increasing withstand voltages in nonuniform electric fields and that they can be further increased by applying solid insulator material having lower permittivity. These enable the clearances between poles and earth to be reduced. With this technology, the volume of the new C-GIS is reduced by 50% compared with conventional ones

Keywords

SF₆ insulation; composite insulating materials; epoxy insulation; gas insulated switchgear; 72 kV; 84 kV; U-type insulator; composite insulation technology; cubicle type gas insulated switchgear; dielectric characteristics; epoxy; low-pressure SF₆; nonuniform electric fields; pole-earth clearances reduction; solid insulator material; withstand voltage increase; Breakdown voltage; Coatings; Corona; Dielectrics and electrical insulation; Electrodes; Gas insulation; Sulfur hexafluoride; Surface treatment; Switchgear; Vacuum breakdown;

fLanguage

English

Publisher

ieee

Conference_Titel

Transmission and Distribution Conference, 1999 IEEE

Conference_Location

New Orleans, LA

Print_ISBN

0-7803-5515-6

Type

conf

DOI

10.1109/TDC.1999.756102

Filename

756102