http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황영록(Young-Rok Hwang),김경철(Kyung-Chul Kim) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.6
Power system fault analysis is commonly based on well-known symmetrical component method, which describes power system elements by positive, negative and zero sequence impedance. The majority of fault in transmission lines is unbalanced fault, such as line-to-ground faults, so that both positive and zero sequence impedance is required for fault analysis. When unbalanced fault occurs, zero sequence current flows through earth and groundwires in overhead transmission systems and through cable sheaths and earth in underground transmission systems. Since zero sequence current distribution between cable sheath and earth is dependent on both sheath bondings and grounding configurations, care must be taken to calculate zero sequence impedance of underground cable transmission lines. In this paper, EMTP-based sequence impedance calculation method was described and applied to 345㎸ cable transmission systems. Calculation results showed that detailed circuit analysis is desirable to avoid possible errors of sequence impedance calculation resulted from various configuration of cable sheath bonding and grounding in underground cable transmission systems.
황영록 ( Youngrok Hwang ),이석주 ( Seoukjoo Lee ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
오늘날 경영환경의 변화에 따라 정부 또는 많은 산업의 기업들이 PM0 를 도입하여 실행하고 있다. 이에 각 산업별 PM0 의 효과적인 도입과 운영을 할 수 있는 방안을 제시하고자 1991 년부터 2007 년까지 선행연구자들이 정의한 주요 기능을 통합하여 IT, 금융, 건설산업 분야 PM0 의 주요 기능과 비교한 결과 각 산업의 PM0 주요 기능 수행비중 및 공통성, 차이점을 도출하였다. 또한, Ayyagari & Henry & Puvis 의 3 가지 가치 영역을 기준으로 각 산업별 PM0 가치 영역 비중을 분석한 결과 주요 가치 영역 및 비중을 분석하였다. 그 결과 PM0 의 효과적인 도입과 운영을 할 수 있는 방안을 제시 할 수 있었으며, 향후 연구에서는 좀 더 다양한 산업군과 폭넓은 사례를 연구하여 다양한 산업별 PM0 의 현황을 파악, 각 산업별 특성에 맞는 역할 및 기능에 대해 가이드를 제시하여 보다 효율적인 PM0 제도 정착의 기준을 마련할 수 있을 것이다.
변압기 보호용 비율차동계전기의 고조파 영향에 관한 연구
김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang),고훈(Hun Kho),정동원(Dong-Won Jung),정해성(Hae-Sung Chung),이동욱(Dong-Wook Lee),정채호(Chae-Ho Jeong),이재윤(Jae-Yoon Lee) 한국조명·전기설비학회 2014 조명·전기설비학회논문지 Vol.28 No.6
Power transformers are applied throughout the power system to connect systems of different voltage to one another. Since a ratio differential relay offers high sensitivity in detection of internal faults in power transformers, it is widely used in the main protection system. The use of nonlinear devices such as rectifiers and other devices utilizing solid state switching have been increased in industry during recent years. For nonlinear loads, the load current is not proportional to the instantaneous voltage. This situation creates harmonic distortion on the system. The harmonic could differential relay misoperation if not recognized. This paper aims at analyzing and probing into the influences of harmonics on a ratio differential relay for power transformer protection.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang),이일무(Il-Mu Lee),정지원(Ji-won Jung) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Power systems becomes more highvoltage and high capacity recently. Power system caused by the accident of insulation breakdown. Excellent power cable is used due to advances in technology, but old cable and damage cable causes a power failure. This paper analyzed partial discharge using pattern analysis method of power cable. The simulation of partial discharge of power cable with defects was analyzed using pattern recognition methods.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang) 한국조명·전기설비학회 2011 조명·전기설비학회논문지 Vol.25 No.8
Development and use of renewable energy due to environmental problems and depletion of energy affect grid-connected power system around the world. Therefore this paper analyzes the characteristic of gird connected photovoltaic power generation system which it is available to connect the utility. Renewable energy photovoltaic power system has been linked to the system to analyze the impact of photovoltaic system. MATLAB / Simulink program is modeled and analyzed on power quality of a photovoltaic power plant. It is measured that power data for the Grid connected photovoltaic power plant with instantaneous measuring, 3sec measuring, 10min measuring for 7 days. Harmonic field measurement have shown that the harmonic contents of a waveform varies with time. A cumulative probability approach is the most commonly used method to solve time varying harmonics. so, it is used 50[%] cumulative probability approach. This paper provides an in depth analysis on power quality field measurement of the Grid connected photovoltaic power plant.
LCD공장 내부의 온도센서 노이즈진단 및 억제에 관한 연구
김경철(Kyung-Chul Kim),최형범(Hyoung-Bum Choi),황영록(Young-Rok Hwang),김용관(Yong-Kwan Kim),유창훈(Chang-Hun You) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.8
As automation equipment and electronic device progresses, the importance of power quality is more increasing. This paper represents the analysis and suppression about the causes of trouble by the inverter’s ON/OFF noise in plant in order to prevent damage resulting in a secondary damage to conduct precise diagnosis and effective noise reduction. The countermeasure as a reduced carrier frequency and the LC resonant filter had been applied and confirmed the effective results to solve the trouble of noise.
최형범(Hyoung-Bum Choi),김경철(Kyung-Chul Kim),황영록(Young-Rok Hwang),이일무(Il-Mu Lee) 한국조명·전기설비학회 2011 한국조명·전기설비학회 학술대회논문집 Vol.2011 No.5월
Development and use of renewable energy due to environmental problems and depletion of energy affect grid-connected power system around the world. Therefore This paper analyzes the characteristic of gird connected photovoltaic power generation system which it is available to connect the utility. Renewable energy photovoltaic power system has been linked to the system to analyze the impact of photovoltaic system. MATLAB / Simulink program is modeled and analyzed on power quality of a photovoltaic power plant.