• Title, Summary, Keyword: Return Current

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Analysis of Return Current Effect for AF Non-insulated Track Circuit in ITX Vehicle Operation (ITX 차량 운행에 의한 AF 무절연 궤도회로의 귀선전류 영향 분석)

  • Beak, Jong-Hyen;Kim, Yong-Kyu;Yoon, Yong-Ki;Jang, Dong-Wook;Shin, Dong-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.4
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    • pp.584-590
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    • 2013
  • Depending on the operating characteristics, track circuit is installed for the purpose of control directly or indirectly of the signal device, point switch machine and other security device. These are mainly used for train detection, transmission of information, broken train detection and transmission of return current. Especially, the return current is related to signal system, power system and catenary line, and track circuit systems. It is one of the most important component shall be dealt for the safety of track side staff and for the protection of railway-related electrical system according to electrification. Therefore, an accurate analysis of the return current is needed to prevent the return current unbalance and the system induced disorder and failure due to an over current condition. Also, if the malfunction occurred by the return current harmonics, it can cause problems including train operation interruption. In this paper, we presented measurement and analysis method at return current and it's harmonics by train operation. By the test criteria, we evaluated for safety. Hereafter, it is expected to contribute to the field associated with it.

A Study on the Effect of Cab Signal through Unbalance of the Traction Return Current (귀선전류의 불평형에 따른 차상신호에 미치는 영향에 관한 연구)

  • Lee, Tae-Hoon;Park, Ki-Bum;Sung, Soon-Uk
    • Proceedings of the KSR Conference
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    • pp.1694-1700
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    • 2007
  • In the electrified section, both of return current and signal current are flowing in the same rail in common. But signal current shall be allowed to flow in the specific track circuit and not in the other circuit while the traction return current shall come back to power sub-station. This paper presents measuring system that use both sensor and antenna. The aim of the system is to achieve the difference in current between the two rails and the presence of trimming capacitors. In order to improve the transmission level, trimming capacitors are connected between the two rails at constant spacing. To maintain the balance of traction return current, rails of both sides may be jointed by the so-called SVPMM. The traction return current is sometimes unbalanced owing to the ill-contact of SVPMM. In this paper, we propose a diagnosis method based on a short-circuited current(Icc), trimming capacitors and traction return current measured by Korail inspection vehicles. Whether Icc is good or bad depends not only on the presence of trimming capacitors but also on the unbalance of the traction return current.

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Comparison of Return current by the Earth type in the Electrical railway system (전기철도시스템의 접지 유형에 따른 귀선 전류 비교)

  • Lee, Gil-Lo;Kim, Yong-Kyu;Baek, Jong-Hyun;Ryu, Chang-Keun
    • Proceedings of the KIEE Conference
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    • pp.53-55
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    • 2005
  • In electrical railway system, power supplied to electrical locomotive by catenary is returned to sub-station on track. The current returned to sub-station on track is return current, which is an essential factor for the safety of the wayside electrical equipment and maintenance staff. Therefore, earth system acts an important role to protect wayside electrical equipment and maintenance staff against return current. In general, individual earth system protects partially the electrical railway system, but common earth system does the whole electrical railway system and minimizes the flow of return current. In this paper, we are compared the effect of return current according to earth type by actual measurement in existing electrical railway system. The measurement was conducted at Shinchungju sub~station in high speed trains, and Guro sub-station, which is electrified section in classical line.

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The Analysis of 4-Conductors Catenary System of AC Railway Feeding System and Calculation of Induced Voltage near Rail Track using the FDTD Method (교류 전기철도 급전계통 4도체군 전차선로 분석 및 FDTD 방법을 이용한 선로 주변 유도전압 계산에 관한 연구)

  • Ryu, Kyu-Sang;Yeom, Hyoung-Sun;Cho, Gyu-Jung;Lee, Hun-Do;Kim, Cheol-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.12
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    • pp.1958-1964
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    • 2016
  • AC railway feeding system use single phase to supply power to the railway vehicles. And the system use the rail track as a return current path, so that current flows in the rail. In this situation inductive interference on communication system and unsafe environment can appear on railway system. Therefore knowing the current distribution of catenary system and analysing the return current is required. In this study detail return current distribution was analyzed by modeling the catenary system as 4-conductors group. The distribution characteristics and trends of return current were studied by using the PSCAD/EMTDC and FDTD method that based on Maxwell equation was used to calculate the induced voltage. Simulation code was made by MATLAB. Using this study result data, we can suggest the proper installation location of digital device and these data can be used for additional studies related to return current or induced voltage as a base data.

Analysis of Return Current Effect for Track Circuit on Ho-Nam high Speed Line (고속열차 운행에 따른 호남고속철도 궤도회로 귀선전류 영향 분석)

  • Baek, Jong-hyen
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.5
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    • pp.1110-1116
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    • 2017
  • Depending on the operating characteristics, track circuit is installed for the purpose of direct or indirect control of the signal device, point switch machine and other security device. These are mainly used for train detection, transmission of information, broken rail detection and transmission of return current. Especially, the return current is related to signal system, power system and catenary line, and track circuit systems. It is one of the most important component shall be dealt for the safety of track side staff and for the protection of railway-related electrical system according to electrification. Therefore, an accurate analysis of the return current is needed to prevent the return current unbalance and the system induced disorder and failure due to an over current condition. Also, if the malfunction occurred by the return current harmonics, it can cause problems including train operation interruption. In this paper, we presented measurement and analysis method at return current and it's harmonics by high speed train operation on the honam high speed line.

Effects of the Common Earth Network on the Traction Return Current in $2{\times}25 kV$ Power Supply System ($2{\times}25 kV$급전 방식에서의 공동 접지망 적용에 따른 귀선 전류의 영향)

  • Kim, Yong-Gyu;Ryu, Chang-Geun
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.9
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    • pp.509-514
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    • 2002
  • The aim of this research is to find out how the common earth network affects the level of the traction return current in the $2{\times}25 kV$ Power Supply System. The traction return current plays a significant role in the operation of the facilities near the rails. It is shown that the common earth network in the $2{\times}25 kV$ power supply system not only minimizes the level of the traction return current, but also increases the safety of the working crew on the railways. In order to determine the relationship between common earth network and the traction return current, we investigated the earth system of the Gyongbu High Speed Line that is constructed following the SNCF regulations. We carried out the field test in the Osong station. The results of the test show that the common earth network minimizes the effect of the traction return current. We also find that the simulated results are very similar to the test results. We concluded that the results of the test can be applied for the rest of the Gyongbu High Speed Line under construction.

Comparison and Analysis of Return Current Measurement Values on High Speed Line (고속선 귀선전류 측정값 비교 및 분석)

  • Kim, Yong-Kyu;Kim, Ju-Yeop;Oh, Seh-Chan;Baek, Jong-Hyun;Yoon, Yong-Ki;Kwak, Woo-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.5
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    • pp.877-884
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    • 2017
  • A method of common earth, which is proposed by French Railway(SNCF) and is applied to high speed railway, minimizes the effect of the traction return current from tracks so that trackside electric devices can be protected and operation and maintenance staffs are kept out from injury in an electric railway environment. According to it, all the new domestic electric railway lines are replaced from existing individual earth method to the common earth method. In this paper, we analyze the correlation between common earth method and traction return current to prove whether the common earth has surely contributed to minimize the effect of the traction return current. The analysis was done based on the measurement of the traction return current at the domestic high speed railway line.

The Influence on Traction Return Current by Pantograph Detachment Frequency of High-speed Train (고속철도차량의 이선빈도가 귀선전류에 미치는 영향)

  • Lee, Sung-Gyen;Cho, Young-Maan;Ko, Kwang-Cheol
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.28 no.9
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    • pp.8-13
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    • 2014
  • Currently it is major problem of electric railway with increasing drive speed such as the arc generated by the pantograph detachment and the distortion current in the motor-block high speed switching. When physical contact between the pantograph and the catenary line is separated, the pantograph detachment arcing occurs and it makes up the conductive noise to the return feeder. We made the EMTP modeling of the railway traction system and the pantograph arc by circuit elements and switches. The influence of pantograph detachment frequency is investigated by changing some frequencies. The over-current occurs in each detachment and it oscillates some time at beginning and stabilizes gradually. The magnitude of over-current is decided by instantaneous value of existing traction return current. If the detachment occurs at a point of peak value or distortion current, the over-current will be more harmful to the power systems connected with the return feeder and will become to arise with increasing detachment frequency.

Impedance Calculation for Electric Railway System using modified Carson's Method (Modified Carson's Method를 이용한 전차선로의 Impedance 계산)

  • LEE Chunbae;KIM Wanggon;LEE Jongwoo
    • Proceedings of the KIEE Conference
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    • pp.1403-1405
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    • 2004
  • The method proposed by Carson contains indefinite complex integral which simulates earth return current. Although the Carson solution is proposed with power series, the solution is limited and valid at special range of frequency. We proposed a simplified Carson solution by modelling earth current path analytical method using ground transmission line return current. In this paper, we studied on trying to find the equivalent distance for earth current return path.

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A Study on the Real Time Measuring Technique of Stray Current by Using Return Current Ratio in the DC Railway System (직류급전시스템에서의 귀환전류 변화비를 이용한 표유전류 실시간 감시기법에 관한 연구)

  • Jung, Ho-Sung;Park, Young;Kim, Hyeng-Chul;Min, Myung-Hwan;Shin, Myong-Chul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.4
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    • pp.892-898
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    • 2011
  • In DC electric railways, while an electric rail car is driving, a part of the working current returned to the substation through rails leaks into the ground. Such a stray current causes railway facilities and metal objects to corrode electrolytically. Therefore, change of stray current needs to be monitored constantly. But so far in domestic, the research on stray current measuring techniques and system adaption are insufficient. To estimate stray current, this paper addresses a method of monitoring the return current that is returned into the negative pole of the substation in real time.