Dielectric characteristics of static shield for coil end of gas-insulated transformer

Author

Inoue, T. ; Inui, A. ; Teranishi, T. ; Murase, N. ; Ohshima, I. ; Toda, K.

Author_Institution

Toshiba Corp., Kawasaki, Japan

fYear

1991

fDate

8-12 Jul 1991

Firstpage

1124

Abstract

The authors discuss the impulse breakdown characteristics of insulation models simulating static shields for coil ends of SF₆ gas-insulated transformers. If a filler made of elastomer material is fitted closely on the covered electrode to eliminate gas gaps between the filler and the covered electrode, the impulse breakdown voltage of the static shield is higher than with gas gaps. If a low-permittivity filler is used, the impulse breakdown voltage of the static shield is still higher. The breakdown voltage can be explained by considering that the breakdown is caused by small gas gaps between the filler and the covered electrode. The dielectric strength of the coil end can be increased by applying a static shield with an elastomer filler to the gas-insulated transformer

Keywords

elastomers; electric strength; gaseous insulation; organic insulating materials; power transformers; sulphur compounds; transformer insulation; SF₆ insulation; coil end; dielectric characteristics; elastomer filler; elastomer material; gas gaps elimination; gas-insulated transformer; impulse breakdown characteristics; impulse breakdown voltage; insulation models; low-permittivity filler; static shield; Breakdown voltage; Coils; Dielectrics and electrical insulation; Electric breakdown; Electrodes; Gas insulation; Positron emission tomography; Power transformer insulation; Solids; Sulfur hexafluoride;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on

Conference_Location

Tokyo

Print_ISBN

0-87942-568-7

Type

conf

DOI

10.1109/ICPADM.1991.172274

Filename

172274