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Frequency domain discussions on PD signal propagation characteristics in GIS
Author(s) -
Imagawa Hiroshi,
Emoto Kunio,
Murase Hiroshi,
Koyama Hiroshi,
Wakabayashi Seiji,
Sakakibara Takaaki,
Haginomori Eiichi
Publication year - 2000
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/1520-6416(20001130)133:3<9::aid-eej2>3.0.co;2-i
Subject(s) - signal (programming language) , waveform , band pass filter , spectrum analyzer , acoustics , spectral line , filter (signal processing) , materials science , frequency domain , center frequency , frequency spectrum , optics , pulse (music) , physics , electrical engineering , engineering , computer science , voltage , astronomy , detector , computer vision , programming language
The frequency dependency of PD signal propagation in GIS was investigated at an underground substation. Injecting dummy pulses into a GIS through its internal electrode, frequency spectra were measured by a spectrum analyzer at various points of the GIS. It is shown that this measurement is very reproducible and the signal propagation phenomena are independent of its direction. It is also clarified that the PD signal reduction phenomena are closely related with mode transfer from TEM to TE or TM. The major higher mode seems to be TE 11 . Pulse waveforms were also measured with 65‐MHz bandpass filter. Their magnitudes are compared with the gain of the 65‐MHz component of the frequency spectra and good agreement is obtained. This implies the possibility of PD location by observing a frequency pattern with several bandpass filters. © 2000 Scripta Technica, Electr Eng Jpn 133(3): 9–17, 2000