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Partial Discharge Location Method using Group Velocity Difference of Modes in a Electromagnetic Partial Discharge Signal in Gas Insulated Bus  

Goo, Sun-Geun (한전 전력연구원)
Ju, Hyoung-Jun (한전 전력연구원)
Park, Ki-Jun (한전 전력연구원)
Han, Ki-Seon (한전 전력연구원)
Yoon, Jin-Yul (한전 전력연구원)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.56, no.12, 2007 , pp. 2184-2188 More about this Journal
Abstract
We developed a novel method of partial discharge(PD) location based on the fact that the waveform of PD signal propagate along the GIB (Gas Insulated Bus) is composed of several modes of electromagnetic wave with different group velocities and cut-off frequencies. From the PD waveform, measured at a broadband PD sensor attached on the GIB, we could derive arrival time and frequency components of different modes using the short term Fourier transform or etc. After the group velocities of different modes are calculated, the location of the PD source could be estimated. To show the effectiveness of this new locating method in a real on site application, we used this method to locate the position of a PD source at a 76 m long 345 kV GIB substation. The estimated location of the PD source using the method proposed above was in good agreement with the actual location found from the inspection result of internal component in the GIB with 2.4% of the estimation error.
Keywords
Partial Discharge; Gas Insulated Bus; Location; Mode; Group Velocity;
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