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변압기 절연지 표면 금속 이물질 방전에 의한 극초단파 신호특성
윤진열,주형준,구선근,박기준,Yoon, Jin-Yul,Ju, Hyung-Jun,Goo, Sun-Geun,Park, Ki-Jun 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.10
This paper was provided to help in detecting defects in power transformer. For this purpose, a partial discharge cell was designed and manufactured as a discharge source to simulate particle defected paper-oil insulation in power transformer. Experimental set-up for measuring PD signals was described. Magnitude of electromagnetic wave signals and corresponding amount of apparent discharge were measured simultaneously against phase of applied voltage to the discharge cell. Frequency range and pattern of PRPD(Phase Resolved Partial Discharge) of partial discharge signals were examined and analyzed. The results will be contributed to build the defect database of power transformer and to decrease the substation faults.
절연유 내 변압기 Turn간 결함에 의한 부분방전의 극초단파 전자기파 신호 특성
윤진열(Jin-Yul Yoon),주형준(Hyung-Jun Ju),구선근(Sun-Geun Goo),박기준(Ki-Jun Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.10
In general, for the condition monitoring of a power transformer using the UHF PD measuring technique, detection of any partial discharge, identifying the defect in the transformer and locating the insulation defect are necessary. In this paper one of the most frequent detects which can result in turn to turn fault in power transformer was examined for identifying the defect. In order to model the defect, as a discharge source, a partial discharge cell was used for experimental activity. Magnitude of electromagnetic wave signals and corresponding amount of apparent discharge were measured simultaneously against phase of applied voltage to the discharge cell. Frequency range and phase resolved partial discharge signals were measured and analyzed. The results will be contributed to build the defect database of power transformer and to decrease the occurrence of transformer faults.
윤진열,한기선,주형준,구선근,Yoon, Jin-Yul,Han, Ki-Son,Ju, Hyung-Jun,Goo, Sun-Geun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
This paper describes the characteristics of electromagnetic wave propagation in power transformer. A transformer which is similar to 154 kV single phase on-site transformer unit was provided for the purpose of the experiment. The 12 dielectric windows on the transformer enclosure to install UHF (ultra high frequency) sensors and the full scale mock ups of winding and the core were also equipped in the transformer. Every sensors to be installed to the transformer was tested and verified whether they show same characteristics or not before the experiment. A discharge gap which was used as a PD (partial discharge) source moved to several necessary locations in the transformer to simulate dielectric defects. Propagation times of electromagnetic wave signal from PD source to sensors decided by the routes of both reflection phenomenon and diffraction phenomenon were compared each other. The experimental results showed propagation route of the PD signal makes an effect on the frequency spectrum of front part of the signal and the magnitude of the signal and propagation time of the signal when the signal is captured on the sensor.
170[kV] GIB 내에서 건조공기(Dry Air)의 절연파괴 특성
한기선,윤진열,주형준,Han, Ki-Son,Yoon, Jin-Yul,Ju, Hyung-Jun 한국조명전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10
In this paper, we changed $SF_6$ insulation gases used already in the GIB(Gas Insulated Bus, gas insulated busbar) of switching appliances of power grid 170[kV] GIS(Gas Insulated Switchgear, Gas Insulated Switchgear) with green insulation dry air gases and studied dielectric breakdown voltage characteristics by the AC voltage withstand test. Withstand test AC voltage applied to the standard KEPCO's 170[kV] GIB with dry air insulation and and the equivalent of dry air and $SF_6$ gas were examined. Breakdown voltage of dry air, using an expression of the experiments were calculated and AC Withstand criterion of dry air insulation for the AC voltage test was derived. Using the criterion, dry air gases can be used instead of the $SF_6$ gas was confirmed in the factory acceptance test at 170[kV] GIB.
한기선,주형준,윤진열,유홍근,Han, Ki-Son,Ju, Hyung-Jun,Yoon, Jin-Yul,You, Hong-Geun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.10
In this paper, we studied the dielectric breakdown voltage characteristics by the AC withstand voltage test on using green insulation dry air instead of $SF_6$ insulation gas used in the GIB (gas insulated bus) of 362 kV GIS (gas insulated switchgear). The AC withstand voltage test applied to the standard KEPCO's 362 kV GIB with dry air insulation, and the equivalence of dielectric breakdown voltage for dry air and $SF_6$ gas were examined, and the empirical formulas of dielectric breakdown voltage for dry air were calculated, and the criterion of AC withstand voltage test for dry air insulation was derived. Using the criterion, dry air can be used instead of $SF_6$ gas for 362 kV GIB in the factory acceptance test was confirmed.