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- 저자 : 宋煥基(Hwan-Kee Song) (검색결과 2 건)
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고정식 및 단축식 태양광 발전의 발전량과 운전시간의 비교
송환기,이경섭,최용성,Song, Hwan-Kee,Lee, Kyung-Sup,Choi, Yong-Sung 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.11
In this paper, the power generation efficiency of the 4 [kW] fixed-concentrated type photovoltaic power generation system and that of the 4 [kW] single axis trace type photovoltaic power generation system were compared. For that purpose, the two types of photovoltaic power generation systems have been in operation for 1 year on an experimental basis. The amounts of power generated by the two types during the months of January through December and the characteristics of their operating times during the same period have been compared and analyzed. For the study, the type with higher efficiency was selected and the following conclusions have been reached. It was shown that the amount of power generated and the average operation times during the spring months of March through May are higher that those of the summer months of June through August when more sunlight is available. The reason for this phenomenon is thought to be that as the temperatures of the solar panel surface and the surrounding environment go up, the electric current decreases.
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On-Line Condition Monitoring of Electrical Equipment Using Temperature Sensor
崔龍成(Yong-Sung Choi),金宣在(Sun-Jae Kim),金榮敏(Yeong-Min Kim),宋煥基(Hwan-Kee Song),李炅燮(Kyung-Sup Lee) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
Condition monitoring technologies allow achieving this goal by minimizing downtime through the integrated planning and scheduling of repairs indicated by condition monitoring techniques. Thermal runaways induced by conduction problems deteriorate insulating material and cause disruptive dielectric discharges resulting in arcing faults. Therefore, having the ability to directly measure the temperature of the contacts while in service will provide more information to determine the true condition of the equipment. It allows corrective measures to be taken to prevent upcoming failure. Continuous temperature monitoring and event recording provides information on the energized equipment's response to normal and emergency conditions. On-line temperature monitoring helps to coordinate equipment specifications and ratings, determine the real limits of the monitored equipment and optimize facility operations. Using wireless technique eliminates any need for special cables and wires with lower installation costs if compared to other types of online condition monitoring equipment. In addition, wireless temperature monitoring works well under difficult conditions in strategically important locations. Wireless technology for on-line condition monitoring of energized equipment is applicable both as stand alone system and with an interface for power quality monitoring system. The paper presents the results of wireless temperature monitoring of electrical equipment at a power plant.
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