Real-time PD identification in diagnosis of GIS using symmetric and asymmetric UHF sensors

Author

Hoshino, Toshihiro ; Nojima, Kenichi ; Hanai, Masahiro

Author_Institution

Toshiba Corp., Kawasaki, Japan

Volume

2

fYear

2002

fDate

6-10 Oct. 2002

Firstpage

798

Abstract

A new practical method for real-time insulation diagnosis of GIS is introduced: a conical coupler is used as an asymmetric UHF sensor while a loop electrode embedded in barrier insulator as a symmetric one. This method can immediately identify the kinds of defects in GIS and discriminate inside partial discharge (PD) from noises by taking single PD pulse. This is because the output ratio of those UHF sensors shows the instinct difference in the kinds of defects due to dissimilar electromagnetic field distributions in GIS. The method will lead to sequential risk assessment based on each identified PD pulse.

Keywords

gas insulated switchgear; insulation testing; partial discharge measurement; switchgear testing; asymmetric UHF sensor; electromagnetic field distributions; gas insulated switchgear; insulation breakdown diagnosis; loop electrode; real-time PD identification; real-time insulation diagnosis; sequential risk assessment; single PD pulse; Acoustical engineering; Computational Intelligence Society; Electrodes; Frequency; Geographic Information Systems; Insulation; Partial discharges; Pulsed power supplies; Testing; UHF measurements;

fLanguage

English

Publisher

ieee

Conference_Titel

Transmission and Distribution Conference and Exhibition 2002: Asia Pacific. IEEE/PES

Print_ISBN

0-7803-7525-4

Type

conf

DOI

10.1109/TDC.2002.1177577

Filename

1177577