Title :
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
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;
Conference_Titel :
Transmission and Distribution Conference, 1999 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-5515-6
DOI :
10.1109/TDC.1999.756102
