• Title, Summary, Keyword: Electric railway system

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A Study on the Unification of The Grounding System of SeoulMetro due to Ageing (서울메트로 접지시스템의 경년변화에 따른 개선 접지 기준)

  • Min Byung-Hoon;Kim Gyunl-Sig;Chung Young-Ki
    • Journal of the Korean Society for Railway
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    • v.9 no.4
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    • pp.394-400
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    • 2006
  • Since Seoulmetro built the first line of electric railway at seoul 1974, the passengers of railway have been increased rapidly, and electric railway requires more electric power for the greater capacity of transport. It is important that we prevent the accidents related with the subway, because all systems of subway are constructed in artificial underground structure. Since the previous versions of the earth system were built to meet the old standards of the electric facility for the lightning, some accidents related with the DC earth fault are causing secondary damages to the electric equipments. So, the old grounding system must be improved, and new standards of grounding system are required. We compare the grounding systems of the domestic railway corporations and the accidents that are related with the grounding systems. And we give ideas to improve the grounding systems and present standards which are suitable to electric railway.

A Study on the Voltage Drop Compensation in AC Electric Railway (교류 전기철도의 전압강하 보상에 관한 연구)

  • Han S.W.
    • Proceedings of the KIPE Conference
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    • pp.896-899
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    • 2003
  • The electric railway has been widely used as a transportation all over the world. It also was opened in 1973 in korea and it has been steadily proceeded in making electric railway network for a big city and building Keongbu high speed , electric railway. That's why the system of electric railway is able to solve the environmental pollution and operate the useful energy in environmental ways, it helps to increase the ability of transportation and to decrease the cost. Because of the advantage of making the economic situation better, the system of electric railway is trying to do their best in developing technique of electric railway. Because of the increasing of transportation and the high speed operation, cars with regenerative braking system was adapted. Therefore, unbalanced voltage and current of three phase system and the drop and rise of voltage of feeding circuit is expected. Now that building the substation, newly spends lots of costs and time, it is a very difficult situation to solve the problem. We can guess that electric railway line can't receive power from the power system of bigger size in building newly electric railway. In this paper, it was proved that series voltage compensator was suitable as a solution according to voltage drop and voltage fluctuating through computer simulation.

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Modeling of Converter-based Single-phase Load for Analysis of AC Substation System of Electric Railway (철도 급전계통 해석을 위한 컨버터 기반 부하 모델링)

  • Son, Ho-Ik;Yoo, Hyeong-Jun;Kim, Hak-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1959-1963
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    • 2012
  • Since electric railway load is variable largely due to starting and braking characteristics as well as various operation patterns, load modeling is not easy but complicated. For this reason, a simple technique for modeling of electric railway load of is required to analyze the AC substation system of electric railway. In this paper, a modeling technique of converter-based electric railway load is proposed and is tested using nonlinear loads on Matlab/Simulink.

BESS Modeling and Application to Voltage Compensation of Electric Railway System (BESS 모델링 및 전기철도 급전계통에의 전압보상 적용)

  • Yoo, Hyeong-Jun;Son, Ho-Ik;Kim, Hak-Man
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.3
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    • pp.417-423
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    • 2013
  • The load of electric railroad can generate voltage fluctuation in the electric railway system because of high speed of the electric railroad and frequent movement and stop. This voltage fluctuation of electric railway system can cause not only voltage imbalance but also harmonic in the utility grid. Therefore the electric railroad system is in need of the reactive power compensation, such as static synchronous compensator (STATCOM) and static var compensator (SVC). Especially, the battery energy storage system (BESS) can control the real and reactive power at the same time. In this paper, the electric railway system using BESS has been modeled to show its voltage compensation effect using Matlab/Simulink.

A Study of Analysis of Fault Data in AC Electrical Railway Power System Based on COMTRADE Using PSCAD/EMTDC (PSCAD/EMTDC를 활용한 COMTRADE 기반의 교류철도 급전계통 사고 데이터 분석에 관한 연구)

  • Lee, Ji-Hye;Min, Myung-Hwan;An, Tae-Pung;Lee, Byeong-Gon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.11
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    • pp.1542-1548
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    • 2018
  • When any faults occurred in electrical railway system, operators need to analysis it quickly and accurately. Existing COMTRADE based analysis tools are not enough to analysis faults occurred in electrical railway system. In this paper, it presents some functions to fault analysis for electrical railway system based on fault data formatted COMTRADE. These functions are implemented in PSCAD/EMTDC and it can be shown that analyzed results against actual electrical fault cases which were occurred in the electrical railway power system.

Development of Analysis Model for Metro Railway DC Electric Power System (도시철도 DC 급전시스템 해석 모델 개발)

  • Cha, Jun-Min;Kim, Hyung-Chul
    • Proceedings of the KSR Conference
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    • pp.1411-1417
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    • 2006
  • The DC electric power system is the most important power source in a metro railway system. As metro railway system is expanded recently, the importance of DC electric power system is emphasized. Furthermore, the study for systemization and standardization of design and operation technique in DC electric power system is undergoing nowadays. For these studies, the development of standard analysis model for metro railway electric power system is required. In this paper, a standard analysis model for metro railway electric power system which is using PSCAD/EMTDC program is developed. The developed model is explained and the validity is shown by using the case studies.

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A Study on a New Power Flow Method for Analysis of AC Electric Railway System and Improvement of Voltage Drop Using a STATCOM (교류 전기철도 시스템의 해석에 적합한 조류계산 기법 및 STATCOM을 적용한 전압 강하 개선 연구)

  • Baek, Jung-Myoung;Lee, Byung-Ha
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.4
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    • pp.669-676
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    • 2007
  • This paper presents a new power flow method to analyze the AC electric railway system effectively in both cases of traction and regenerative braking of the trains. The algorithm to easily solve the power flow of the AC electric railway system with the trains of regenerative braking from the system without a train of regenerative braking is derived. Using this new power flow method, the voltage characteristics of a typical AC electric railway system is easily analyzed in both cases of traction and regenerative braking of the trains. We show that the presented method can be applied effectively in order to analyze the AT-fed AC electric railway system in both cases of traction and regenerative braking of the trains. A STATCOM(Static Synchronous Compensator) is applied to the system in order to improve the voltage drop problem and this case is also analyzed to show the effect of STATCOM.

Analysis on Voltage Rise of Rail in High speed Railway System (고속철도 시스템의 레일 전위 상승 해석)

  • 이종우
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.8
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    • pp.481-485
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    • 2003
  • In electric railway system, potential of rail has been risen, for return-current flows through rail. The magnitude of rising voltage is different to railway feed system, ground admittance of rail and the load current. If rising voltage of rail is large, electric shock can be occurred to passengers and maintenance- worker, In this paper, we estimate the rising voltage of rail in high speed railway system and check the safety to human beings.

A Novel Fault Location Scheme on Korean Electric Railway System Using the 9-Conductor Representation

  • Lee, Chang-Mu;Lee, Han-Sang;Yoon, Dong-Hee;Lee, Han-Min;Song, Ji-Young;Jang, Gil-Soo;Han, Byung-Moon
    • Journal of Electrical Engineering and Technology
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    • v.5 no.2
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    • pp.220-227
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    • 2010
  • This paper presents a novel fault location scheme on Korean AC electric railway systems. On AC railway system, because of long distance, 40[km] or above, between two railway substations, a fault location technique is very important. Since the fault current flows through the catenary system, it must be modeled exactly to analyze the fault current magnitude and fault location. In this paper, suggesting the novel scheme of fault location, a 9-conductor modeling technique including boost wires and impedance bonds is introduced based on the characteristics of Korean AC electric railway. After obtaining a 9-conductor modeling, the railway system is constructed for computer simulation by using PSCAD/EMTDC. By case studies, we can verify superiority of a new fault location scheme and propose a powerful model for fault analysis on electric railway systems.

A Study on the Form of Electric Shock Accident Using Swiss Cheese Model (스위스 치즈 모델을 적용한 철도 감전사고 발생형태에 관한 연구)

  • Yu, Ki-Seong;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.12
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    • pp.1711-1716
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    • 2018
  • Unlike conventional transmission and distribution lines, catenary system for operating electric railway vehicles are composed of multi-conductor groups (feeder line, contact wire, messenger wire, protection wire) and are used for railway employees, public or passengers in the station yards. Electric shock hazards are exposed and electric shocks such as death or serious injury are occurring in electric railway vehicles, railway high-voltage distribution lines, and catenary system. In order to analyze the types of electric shock accidents on railway by systematic approach method, we modeled 'unsafe behavior classification' method using swiss cheese model. Based on this method, we derived the type of electric shock accidents about railway accidents during the last 5 years by analyzing the frequency of occurrence of human errors and unsafe acts, laws and regulations related to violations, and so on.