Statistical behaviour of GIS and GIL insulations

Author

Finkel, M. ; Boeck, W. ; Lederle, Ch

Author_Institution

Inst. for High Voltage Eng. & Electr. Power Transmission, Tech. Univ. of Munich, Germany

Volume

1

fYear

2003

Firstpage

37

Abstract

The statistical breakdown behaviour of SF₆ and N₂/SF₆ insulated equipment depends on the electrode geometry, the electrode material and changing conditions at the electrode surface due to previous oxidation and breakdowns. In this context investigations were undertaken with positive lightning impulse voltage and pure SF₆ in a revolvable wheel-plane gap. Comparing these test results with previous test results without rotation the breakdown distribution function is steeper. This effect is explained by a charge accumulation on the alumina layer. The test results can be used for insulation co-ordination of GIS and GIL.

Keywords

SF₆ insulation; aluminium; electric breakdown; electrodes; gas mixtures; impulse testing; insulation testing; nitrogen; sparks; Al; GIL insulations; GIS insulations; N₂; N₂/SF₆ insulated equipment; SF₆; SF₆ insulated equipment; SF₆-N₂; alumina layer; charge accumulation; electrode geometry; electrode surface; insulation coordination; positive lightning impulse voltage; revolvable wheel-plane gap; statistical breakdown; steeper breakdown distribution function; Computational geometry; Electric breakdown; Electrodes; Gas insulated transmission lines; Geographic Information Systems; Insulation; Lightning; Oxidation; Testing; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 2003. Proceedings of the 7th International Conference on

ISSN

1081-7735

Print_ISBN

0-7803-7725-7

Type

conf

DOI

10.1109/ICPADM.2003.1218347

Filename

1218347