Title :
Partial discharge measurement in a long distance SF6 gas insulated transmission line (GIL)
Author :
Okubo, H. ; Yoshida, M. ; Takahashi, T. ; Hoshino, T. ; Hikita, M. ; Miyazaki, A.
Author_Institution :
Nagoya Univ., Japan
fDate :
7/1/1998 12:00:00 AM
Abstract :
We evaluated the generation, radiation, and propagation characteristics of partial discharge (PD) signals in 275 kV full-scale SF6 gas insulated transmission line (GIL) model with a length of 168 m. We analyzed the correlation between the PD current pulse and the radiating electromagnetic wave by comparing their frequency spectrums. In addition, simultaneous measurement was performed on the current pulse waveform of a single PD and the corresponding electromagnetic wave as propagated in GIL, with the phase gate control method. As a result, the PD signal attenuation rate of 50 MHz and 300 MHz for the propagation of 100 m was obtained as 2.5 dB and 8.7 dB, respectively. Furthermore, by selecting an appropriate measuring frequency, even a 1~2 pC PD could be detected at the measuring site 168 m away from the PD source in the GIL
Keywords :
SF6 insulation; insulation testing; partial discharges; power cable insulation; power cable testing; power transmission lines; 100 m; 168 m; 275 kV; 300 MHz; 50 MHz; PD current pulse; PD signal attenuation rate; SF6; UHF sensor; frequency spectrums; long distance SF6 gas insulated transmission line; partial discharge generation characteristics; partial discharge measurement; partial discharge propagation characteristics; partial discharge radiation characteristics; phase gate control method; radiating electromagnetic wave; Character generation; Electromagnetic measurements; Electromagnetic propagation; Electromagnetic scattering; Frequency measurement; Gas insulated transmission lines; Partial discharge measurement; Partial discharges; Pulse measurements; Signal generators;
Journal_Title :
Power Delivery, IEEE Transactions on
