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가스절연모선(GIB)에서 전자파 방전신호의 모드별 군속도 차이를 이용한 방전위치 산정기법
具嬋根(Sun-geun Goo),朱炯俊(Hyoung Jun Ju),朴基濬(Kijun Park),韓基善(Ki-Seon Han),尹珍烈(Jin-yul Yoon) 대한전기학회 2007 전기학회논문지 Vol.56 No.12
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 ㎸ 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.
TDR을 이용한 극초단파 대역에서 사용 절연유의 유전율과 전파속도 측정
具嬋根(Sun-Geun Goo),朱炯俊(Hyoung Jun Ju),朴基濬(Kijun Park),韓基善(Ki-Seon Han),尹珍烈(Jin-Yul Yoon) 대한전기학회 2008 전기학회논문지 Vol.57 No.11
We measured the permittivity and electromagnetic wave propagation velocity of used insulation oil with wide frequency range including ultra-high frequency by time domain reflectometry. The permittivity or propagation velocity is essential for locating discharge faults of oil filled power transformer. We derived 2.21 as a permittivity and 2.03 × 10? ㎧ as a velocity from the measurement of pulse travelling time along a coaxial line filled with used insulation oil or air. The permittivity measurement system we designed shows high measurement accuracy and the convenience for field use.