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고속철도 신호기계실의 접지전류 진단 및 개선방안에 관한 연구
윤용기(Yong-Ki Yoon),김성진(Sung-Jin Kim),고경준(Kyeong-Jun Ko),박채옥(Chae-Ok Park),김용규(Yong-Kyu Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.10
Through the construction of high-speed railways and the electrification projects, the railway ground was switched to the common grounding method with the individual(or independent) grounding method. The common grounding method can eliminate the potential difference between the equipment connected to the common grounding line, but the line is used for the path which the return current of a train flows. As a result, it has been confirmed that the impulse surge current invades the signal machine room through the ground wires of the track circuit cable that connects the track circuit devices in the field and the transmitter and receiver in the signal machine room. It was also confirmed that the grounding current that entered the signal machine room affects the grounding current of other equipment in the room. The grounding system inside the signal machine room consisted of the common grounding line buried along the track and a steel frame of the building structure, but the steel frame grounding of the building structure was used as a path for another impulse surge current to enter the room. The ground current that entered the signal machine room continued to adversely affect certain equipment in the machine room, causing the equipment to malfunction or eventually burn out. Therefore, in this paper, we analyze the state of the ground current in the signal machine room and present measures to prevent the impulse surge current from entering the room and suppress the generation of ground circulating current in the room.
Smart열차진로제어를 위한 선로데이터 생성관리프로그램의 데이터 구조
윤용기(Yoon Yong-Ki),황종규(Hwang Jong-Gyu),조현정(Jo Hyun-Jeong),이재호(Lee Jae-Ho) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
Even though the existing train route controlling method, using track circuits, ensures the sufficient number of operation, it still has problems such as discordance between train numbers which was planned for operating and train numbers being operated on the track, and allowing only one train entering for one route. To solve those problems, we study and develop the Smart train route controlling system which uses the real-time informations of train positions. This system enables improve the coefficient of utilization in a certain train route controlling section, and the safety level of train route controlling, but we should ensure satisfying reliability of data about tracks operated by trains. In addition, there is a need to protect accidents caused by erroneous information of train position, by reflecting changes of tracks, for example maintenance, improvement, expansion of tracks. In this paper, we describes data structure of a developed program which required to change CAD files to wiring diagrams and to generate them to data of tracks. And we show the result that the simulator, using the data structure, controls speed and route of trains without problems.
윤용기(Yoon Yong-Ki),홍진기(Hong Jin-Ki),김용규(Kim Yong-Kyu) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Train control system is a safety system that protects collision and derailment of trains by maintaining the safe interval between the leading and the subsequent trains. To protect these kinds of accidents, the train control system should conduct functions in a safe and accurate way such as train location detection, movement authority establishment, speed profile framing, and supervision/control for train speed. In general the onboard equipment of TCS detects a train location, after that transmits the information to wayside. The wayside equipment of TCS verifies the train location information and then transmits them to wayside by framing movement authority and static speed profile. The onboard equipment makes out the dynamic speed profile based on the information transmitted from wayside. With this criteria, it supervises and controls the train speed. Therefore, train location detection and movement authority establishment are more important in order to improve reliability and safety of train speed control. In this paper we present the concept design for train location detection and train movement authority settings, the definitions of interfaces and their detailed functionalities. We also propose the scheme for reliability and safety improvement.
FTA(Fault Tree Analysis)를 이용한 철도신호설비 안전기준대상 선정에 관한 연구
윤용기(Yoon Yong-Ki),정락교(Jeong Rag-Gyo),김용규(Kim Yong-Kyu) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
Railway signal system is responsible for the safety operation of railway and performs vital functions as safe space control, route control and etc. These functions prevent collision accidents between trains and derailment accidents of trains. However, these accidents are occurred by some causes. It is necessary to analysis hazards, hazard frequency and risk contribution. And railway signal system must make practical application of the analysis results. This paper includes analysis results of railway accident data by FTA(Fault Tree Analysis) and hazards. Railway signal system must consider these hazards. This paper used the railway accident data of RSSB(Railway Safety & Standard Board) of UK. We will use the FTA result to set up a draft of safety criteria of railway signal system.