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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.
저압용차단기 전원 개폐시 개인용 PC에 미치는 영향 분석
길형준(Hyoung-Jun Gil),송길목(Kil-Mok Shong),김영석(Young-Seok Kim),김종민(Chong-Min Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.12
This paper describes the analysis of the effect on personnel computer in case of turning off power supply of main breaker in general electrical installation. In order to analyze the effect on personnel computer in case of turning off the power supply of main breaker, the switching impulse generator has been designed and fabricated which makes it possible to evaluate the effect on electrical product by switching impulse. The switching impulse tests were carried out for personnel computer according to applied voltage and number of switching impulse. As a consequence, switching impulse had not a significant influence on personnel computer in this study. The varistor of power input section functions as a protection of switching impulse as well as lightning impulse. The results will be used to related organization, and electrical product manufacturer, and residents.
낙뢰 보호용 접지시스템 평가를 위한 고주파 접지임피던스 측정시스템의 설계 및 제작
길형준 ( Hyoung Jun Gil ),송길목 ( Kil Mok Shong ),김영석 ( Young Seok Kim ),김종민 ( Chong Min Kim ),김영진 ( Young Jin Kim ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.3
This paper describes the design and fabrication of high frequency ground impedance measuring system for assessment of grounding system for Lightning protection. The ground impedance measuring system has been designed and fabricated which makes it possible to assess the ground impedance by frequency ranges from 100 Hz to 1 MHz. The effective grounding systems having a very low impedance to electromagnetic disturbance such as lightning surges and noises in microelectronics and high-technology branches are strongly required. In order to analyze the dynamic characteristic of grounding system impedances in lightning and surge protection grounding systems, it is highly desirable to assess the ground impedances as a measure of performance of grounding system in which lightning and switching surge currents with fast rise time and high frequency flow. The measuring system is based on the variable frequency power supply and consists of signal circuit part, main control part, data acquisition and processing unit, and voltage and current probe system. The ground impedance measuring system can be used to assess grounding system during occurrence of lightning.
길형준 ( Hyoung Jun Gil ),송길목 ( Kil Mok Shong ),김영석 ( Young Seok Kim ),김종민 ( Chong Min Kim ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.2
This paper describes the analysis of deterioration characteristics for connection factor used in grounding system. The connection method of grounding system is specified in IEC standard. In order to analyze the deterioration characteristics for connection factor, deterioration test was carried out when the connection factor was buried in salt water and underground. The test connection factors were C-type sleeve, clamp, and exothermic welding. As a consequence, most of the connection factor was corroded, and the electrical resistance decreased after deterioration. The analytical results can be used to establish the safety of grounding system.
접지 그리드에서의 보조전극 배치에 따른 접지임피던스 측정 및 분석
길형준 ( Hyoung Jun Gil ),송길목 ( Kil Mok Shong ),김영석 ( Young Seok Kim ),김종민 ( Chong Min Kim ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.4
This paper describes the measurement and analysis of ground impedance according to arrangement of auxiliary probe around ground grid using the fall-of-potential method and the testing techniques to minimize the measuring errors are proposed. The fall-of-potential method involves passing a current between a ground electrode and a current probe, and then measuring the voltage between a ground electrode and a potential probe. To minimize interelectrode influences due to mutual resistances, the current probe is a generally placed at a substantial distance from the ground electrode under test. In order to analyze the effects of ground impedance due to the arrangement of auxiliary probe and frequency, ground impedances were measured in case that the arrangements of auxiliary probe were straight line, perpendicular line, and horizontal line. The distance of current probe was located from 10[m] to 200[m] and the measuring frequency was ranged from 55[Hz] to 513[Hz]. As a consequence, the ground impedance increases with increasing the distance from the ground electrode to the point to be tested, but the ground impedance decreases with increasing the frequency.