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가정용 연료전지 모니터링 시스템 구축 및 전기적 안전성 평가
한운기(Woon-Ki Han),안재민(Jae-Min Ahn),최종수(Joong-Soo Choi) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
가정용연료전지 모니터링 시스템에 의한 운영상의 문제점연구가 필요하다. 가정용연료전지의 실계통운영상에서 발생되는 수용가의 전압(실효치, 순시치), 전류(실효치, 순시치), 출력량(유효전력, 무효전력), 및 주파수 데이터를 취득하고 있으며, 지속적 데이터 분석으로 사고 방지방안을 제시하였다. 실제 축소모델을 이용하여 사고발생시 고장원인 및 사고방지 방안을 모니터링 시스템구현을 통하여 예방하고자 한다.
한운기(Woon-ki Han),한기봉(Ki-boong Han),길형준(Hyung-jun Gil),최충석(Chung-seog Choi) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
Street light facilities, which are easily accessible, can be in danger of electric shock when water percolates the facilities especially in summer. In case deteriorated facilities are not checked regularly, they can cause accidents such as electric shock. We should consider regional characteristics to prevent this kind of accidents. In this paper, we analyzed the problems according to the facilities through the research on the actual conditions. We also analyzed the facilities by region and the standards by the conditions.
한운기(Woon-Ki Han),송길목(Gil-Mok Shong),김영석(Yong-Seok Kim),김동욱(Dong-Wook Kim),최충석(Chung-Seog Choi),이복영(Bok-Yong Lee),박상태(Sang-Tae Park) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
This paper describes the cut off time and the current characteristics of virgin RCDs and deteriorated ones in the seashore. The RCDs(Residual Current Protective Devices) are used for protecting the human body from electrical shock and for preventing facility accidents. According to the Korean standards, the RCDs are installed in panel boards. When RCDs are installed outside, they must be enclosed inside waterproof cases. In the case that RCDs are employed at temporary power sites and electrical facilities on the road, they are exposed to the of external environment. As a result the RCDs deteriorated in the seashore for 3 months showed high failure rate, while the virgin RCDs all complied with Korean Standard Considering that the RCDs are used under exposed condition outside, the reliance of RCDs must be ensured by modifying the related regulations and codes and by developing improved models advanced in their performance.
한운기(Woon-Ki Han),정진수(Jin-Soo Jung),안재민,김오환,송종규,김재철(Jae-Chul Kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
In this paper development of the estimation method for an electrical equipments installation based on IEC 60364. The analysis objects are the difference between electrical equipments installation in korea & electrical equipments installation based on the IEC 60364. The measurement elements are loop impedance, operating characteristic of circuit breaker and protective conductor continuance.
접지저항 측정을 위한 보조전극 위치에 따른 접지저항 비교 분석
한운기(Woon-Ki Han),정진수(Jin-Soo Jung),김재철(Jae-Chul Kim) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.10
본 논문에서는 전류보조전극 및 전위보조전극의 접지저항 측정위치에 따른 접지저항 측정결과를 비교 분석하였다. 국내의 경우 접지전극의 대각선 길이의 6.5배 이상에서 접지저항을 측정하고 있으나 도심지역에서는 이와 같은 방법은 한계를 나타내고 있다. 이를 해결하기 위해 본 논문에서는 접지저항 측정시 접지전극, 전류보조전극과 전위 보조전극간의 거리, 각도를 변경하여 접지저항을 측정하였다. 측정결과 접지전극과 전류보조전극간의 거리를 50[m] 이상, 전위보조전극을 30[m] 이상 이격을 하고 전류보조전극과 전위보조전극을 45도 이상 각도를 유지할 경우 안정적인 접지저항이 측정되었다. This paper describes the comparison and analysis about measurement method of earthing resistance by positions of potential pole and current pole. In KOREA, a diagonal by 6.5 times of earthing electrode for measurement of earthing resistances but this method was almost impossible in the downtown area. For solving this problem, in this paper measuring of earthing resistance changing parameters. The parameter was a distances of earthing electrode, potential pole & current pole and the another parameter was an angles of potential pole & current pole. Analysis result, earthing resistance stability that conditions. Fist, distance from earthing electrode to current pole was over 50[m] and distance from earthing electrode to potential pole was over 30[m]. Second, angles of potential pole & current pole was over 45[°].
Development of Electrical Safety Evaluation Method about PEMFC 1kW
한운기(Han, Woonki),박찬엄(Park, Chaneum),정진수(Jung, Jinsu),고원식(Ko, Woonsik) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
Fuel cell systems are a completely different form of electricity source that has been used so far and is an aggregation of multiple technologies with multidisciplinary features that can be operated safely only when gas and electrical safety are being considered. Since fuel cells generate through electrochemical reactions there are difficulties in ensuring electricity safety, power quality assessment, effective control and reliability standards for system faults using conventional inspection techniques and even though they are necessary as a primary means for reduction of co₂ owing to the Climate Convention, electrical safety assessment and measures are required for the prevention of faults in residential facilities. Although small-scaled distributed power supplies can be utilized as important means of peak control and energy management measures, research is required for observing the effects on the system and the development of inspection technology to ensure stable operation, and the electrical safety of residential fuel cell systems need to be assessed and the problems derived for establishing electrical safety standards. From the year 2002, Japan has established laws on technical safety standards and development and rules on the product specifications and standards for the industrialization of hydrogen fuel cells. Also, a lot of effort have been made for the commercialization of fuel cells by building one-stop certification services. Internationally, the IEC TC 105 has established international standards based on fuel cells. In order to protect the national interest, the country should be able to respond accordingly meet global standards. In fact, in Korea, to comply with the international trend, Korea Energy Management Corporation is establishing a certified agenda for fuel cells and Korean Agency for Technology and Standards is enacting technical standards for fuel cells. The current terms of fuel cells are that research has been focused more on the quality and performance of manufactured products rather than stable power operation and maintenance over time. In this paper, by considering the household fuel cell as a power device, the safety standards of the fuel cell system for a reliable operation with the existing power system is being proposed.