Dependence of partial discharge characteristics at spacer surface on particle size in SF6 gas insulated system

Author

Hayakawa, Naoki ; Okusu, Takashi ; Nishizawa, Kanako ; Kojima, Hiroki ; Endo, Fumihiro ; Yoshida, Masanobu ; Uchida, Katsumi ; Okubo, Hitoshi

Author_Institution

Nagoya Univ., Nagoya

fYear

2008

fDate

21-24 April 2008

Firstpage

46

Lastpage

50

Abstract

A metallic particle appeared in a gas insulated switchgear (GIS) sometimes adheres on a solid spacer surface. If the adhered metallic particle is exposed to a surge high voltage, a breakdown (BD) may be induced. Therefore, it is eagerly demanded to diagnose its risk correctly under the service voltage by partial discharge (PD) measurement. In this paper, particle-initiated surface PD characteristics were systematically studied in 0.4 MPa SF₆ gas by changing the sizes of particles. PD inception voltage (PDIV), temporal change of PD current and the PD pulse number were analyzed in detail. Furthermore, comparing with PD characteristics of particles in a gas gap, the influence of the solid insulator on the PD characteristics was clarified. It was found out that PD characteristics greatly changed with time owing to electric charges deposited on a spacer surface.

Keywords

SF₆ insulation; gas insulated switchgear; partial discharge measurement; particle size; SF₆ gas insulated system; electric breakdown; gas insulated switchgear; metallic particle size; partial discharge characteristics; partial discharge measurement; solid spacer surface; surge high voltage; Electrodes; Gas insulation; Geographic Information Systems; Partial discharges; Pulse measurements; Solids; Sulfur hexafluoride; Surface discharges; Surges; Voltage; Diagnosis; GIS; Partial discharges; Particle; SF6 ga;

fLanguage

English

Publisher

ieee

Conference_Titel

Condition Monitoring and Diagnosis, 2008. CMD 2008. International Conference on

Conference_Location

Beijing

Print_ISBN

978-1-4244-1621-9

Electronic_ISBN

978-1-4244-1622-6

Type

conf

DOI

10.1109/CMD.2008.4580227

Filename

4580227