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전기철도와 평행한 매설배관에서 누설전류에 의한 간섭현상의 수치해석적 연구
정찬웅(Chan Oong Jung),최규형(Kyu Hyoung Choi) 한국가스학회 2008 한국가스학회지 Vol.12 No.4
전기철도의 궤도 누설전류는 주변 시설물 뿐 만 아니라 궤도 및 부속물의 전식을 일으킬 우려가 있다. 최근에는 누설전류의 영향을 감소시키기 위한 많은 노력이 기울여지고 있다. 본 연구에서는 수치해석 방법을 통하여 궤도와 매설배관의 이격거리, 토양비저항, 배관의 피복저항율, 궤도의 접지저항 등의 요인에 따른 간섭영향을 정량적으로 평가하였다. 이러한 정량적 연구결과를 토대로 주요 변수에 따른 간섭현상의 변화 방향을 예상할 수 있었으며 향후 대책의 수립과 수치해석에 있어서 각 변수의 민감도를 예상할 수 있었다. The stray current interference problem could induce the corrosion of near-by structure and rail itself. Many efforts has been concentrated on the reduction of the interference. In this work the influences of separation distance, soil resistivity, pipe coating resistance, leak resistance of rail were studied using the numerical analysis methods. These analysis could be used to estimate the sensitivity of each variables in the study of the mitigation method and their numerical analysis.
Electric-optical Characteristics of LED Flat Light Source in Low Temperature Condition
한정민(Han Jeong Min),심용식(Shim Yong Sik),정찬웅(Jung Chan Oong),오선(Oh Seon),황종선(Hwang Jong Sun),최대섭(Choi Dae Seub) 한국조명·전기설비학회 2010 한국조명·전기설비학회 학술대회논문집 Vol.2010 No.5월
LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1W high power of the lumileds company. We could know that this backlight unit releases to 6500 rut in 14W power consumption and start up voltage time is under the15㎳ in the ambient temperature -20 ℃
공기압을 이용한 패드 변압기 침수방지용 장치 개발에 관한 연구
김기현(Gi-Hyun Kim),이상익(Sang-Ick Lee),배석명(Seok-Myung Bae),정찬웅(Chan-Oong Jung),이재용(Jae-Yong Lee) 대한전기학회 2009 전기학회논문지 P Vol.58 No.1
The inundation of substation and ground power equipment breaks out every summer season in low-lying downtown and low-lying shore by localized heavy rain, typhoon and tidal wave. For diminishing flood damage of electrical equipment in the root, flood protection system which is used the basic frame of Pad transformer is developed using pneumatic pressure. This system is established on pressure generator equipment and sensor of flooded level operates at flooding occurrence and is maintained a shutting tightly structure. The system is able to protect indraft water in Pad Transformer and supply the electricity at emergency(flooding). And we tested safety for insulation resistance at flooding and applying an electrical current. We estimate that loss cost which is caused by with flooding and the power failure will be diminished if it is addition to advances the reliability evaluation by setting an example.