Title :
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
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;
Conference_Titel :
Transmission and Distribution Conference and Exhibition 2002: Asia Pacific. IEEE/PES
Print_ISBN :
0-7803-7525-4
DOI :
10.1109/TDC.2002.1177577
