Title :
The study of partial discharge in GIS under impulse voltage based on time-frequency analysis
Author :
Zhong Ren ; Ming Dong ; Ming Ren ; Hai-Bin Zhou ; Jin Miao
Author_Institution :
State Key Lab. of Electr. Insulation & Power Equip., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
In order to explore the mechanism of partial discharge (PD) in SF6, a artificial suspension defect was installed in the bus segment of 220kV GIS and the PD in GIS under impulse voltage was detected. In this paper, the time frequency analysis theory i.e., short-time Fourier transform (STFT), Wigner-Ville distribution and Gabor Transform (GT), was applied to study PD signals. The results indicated that the signals, which were processed by STFT, Wigner-Ville distribution and GT, could correctly reflect characteristic of the PD pulse sequence in time-frequency plane and the variation patterns of the single pulse frequency spectrum with the change of time. It was easier to get the gathering area of the PD pulse sequence in the time-frequency plane by STFT and GT than Wigner-Ville distribution.
Keywords :
Fourier transforms; SF6 insulation; Wigner distribution; gas insulated switchgear; partial discharges; time-frequency analysis; GIS; GT; Gabor transform; PD mechanism; PD pulse sequence reflect characteristic; PD signals; SF6; STFT; Wigner-Ville distribution; artificial suspension defect; bus segment; gas insulated switchgear; impulse voltage; partial discharge mechanism; short-time Fourier transform; single pulse frequency spectrum variation patterns; time-frequency analysis; voltage 220 kV; Fourier transforms; Partial discharges; Spectrogram; Sulfur hexafluoride; Time frequency analysis; gas insulated switchgear; impulse voltage; partial discharg; time-frequency;
Conference_Titel :
Condition Monitoring and Diagnosis (CMD), 2012 International Conference on
Conference_Location :
Bali
Print_ISBN :
978-1-4673-1019-2
DOI :
10.1109/CMD.2012.6416240
