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정종만(Jong-man Joung),이병성(Byung-sung Lee),최종기(Jong-Gi Choi),정연하(Yon-Ha Joung),박철배(Chul-Bae Park),송일근(Il-Kun Song) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
In this paper variety test results were discussed regarding to the ground potential increase. The tests conducted with a joint box simulating leakage point having an insulator fault. Inside the joint box three-phase cables and one neutral line were connected and the insulator at jointed part was peeled from the one of three-phase cables. The potentials around manhole cover were measured with the variation of manhole material, ground resistance and water resistance when the manhole was flooded. The potentials induced by an electric leakage were drastically decreased with increasing the distance from the leakage location and with less ground resistance.
정종만(Jong-Man Joung),이병성(Byeong-Seong Lee),송일근(Il-Kweon Song) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
To enhance the reliability of distribution transformers in service and to reduce the cost of maintaining and replacing these, the condition and life of those insulating system should be evaluated accurately and the time to replace should be determined economically. Since the transformer failures related to insulation failure indicates that the primary cause is normally mechanical failure of integrity due to loss of mechanical strength as a result of degradation, the tensile strength characteristics of paper during ageing under accelerated conditions in insulating oil and research trends for assessing the life of insulating paper were investigated.
정종만(Jong-man Joung),이병성(Byung-sung Lee),김주용(Ju-yong Kim),송일근(Il-Kun Song),김병숙(Byung-suk Kim) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.5월
In this paper the thermal aging characteristics of transformer fluid were considered. First, the temperature rise characteristic in transformer winding was discussed. The temperatures were rapidly increased immediately with applying load and then the temperature was followed the exponential temperature rise model. Next, Capacitance and leakage current characteristics of the transformer fluid were measured during the over-loading operation. The capacitance of vegetable fluid and leakage current were evidently increased wit aging time. So the simple methods could be applied to diagnosis of the transformer aging.
김병숙(Byung-Sook Kim),정종만(Jong-Man Joung),이병성(Byung-Sung Lee),송일근(Il-Keun Song),한병성(Byoung-Sung Han) 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.1
본 논문은 권선내부에 온도계가 설치된 지상변압기를 제작하여 부하운전에 따른 배전용 변압기의 온도상승 특성과 절연유의 유전특성 변화를 관찰하였다. 관찰결과 배전용변압기의 경우 과열점은 세 권선 중 두개의 권선이 접하고 권선의 약 2/3 높이에 위치하고 있으며, 과열점과 절연유 상부 간에 약 17[℃]의 일정한 온도차를 확인할 수 있었다. 또한 절연유의 정전용량특성은 온도와 선형적인 관계로 감소하는 특성을 보이며, 그 기울기는 열화율과 무관하게 -0.0106의 일정한 값을 관찰할 수 있었다. 이 결과는 수명손실의 정확한 계산과 열화진단을 위한 기구로 활용할 수 있을 것이다. Temperature rise characteristics of medium voltage class transformers and dielectric characteristics of its insulation oil according to the loading rate were investigated using the transformer that has thermocouples embedded in the windings. The hottest-spot of the transformer locates at about 2/3 height of the windings where they adjoin each other among the 3 phase windings. The temperature difference between the hottest-spot and top-oil is about 17[℃] and the value keeps uniformly in short time after changing the loading rate. Capacitance of the oil varies in inverse proportion to temperature and the inclination rate is about -0.0106 that is not dependent on the aging rate. On the other hand the capacitance is increased depending on the aging rate, so the capacitance characteristics of the oil could be applied to the diagnostic technique.
골쇄보가 Streptomycin으로 손상된 생쥐의 배양 섬유모세포에 미치는 영향
박상면 ( Sang Myeon Park ),이종화 ( Joung Hwa Lee ),이강창 ( Kang Chang Lee ),양현웅 ( Hyun Woong Yang ),이병찬 ( Byung Chan Lee ),이정헌 ( Jung Hun Lee ),정종길 ( Jong Gil Jeong ),서부일 ( Bu Il Seo ),강영성 ( Young Seung Kang 대한본초학회 2003 大韓本草學會誌 Vol.18 No.1
N/A Objectives : To examine the cytotoxicity of streptomycin(STR) on cultured mouse fibroblasts, cytotoxocity-induced by STR was measured by MTT assay. Methods : Fibroblasts were cultured in the media containing various concentrations of STR for 72 hours. In addition, cytoprotective effect of Drynariase Rhizoma(DR) on STR-induced cytotoxicity in fibroblasts was examined when fibroblasts were preincubated with various concentrations of DR for 2 hours before treatment of 5 ㎍/ml STR for 72 hours. Results : STR decreased remarkably cell viability in a dependentmanner in these cultures, and also DR increased cell viability and amount of DNA synthesis damaged by STR. Conclusions : From the above results, it is suggested that STR has toxic effect in cultured mouse fibroblasts, and also DR was effective in the protection of STR-induced cytotoxicity in these cultures.