• Title, Summary, Keyword: Track Circuit

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A Study on the Length of Electrical Separation Joint in AF Track Circuit (AF궤도회로에서 전기적 절연구간의 길이에 대한 연구)

  • Lee, Myung-Chul;Park, Jae-Young
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.1
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    • pp.70-75
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    • 2013
  • The electrical separation joint as a filter circuit distributes the track circuit frequency. The electrical separation joint is classified into the interval where reinforcing bars are insulated and not insulated through the length of track circuit. In case of incorrectly setting up the length of electrical separation joint, the amplitude of current on the track circuit is not over standard current which is the standard of current on the track circuit and it effects on the close frequency on track circuit. Then, it makes an accident or makes a train not receive information for train control. In this paper, the electrical separation joint model is suggested and parameters are numerically calculated in the model. Moreover, the length of electrical separation joint is analyzed and is demonstrated by uisng Matlab and PSpice program.

A Study on the Distance Between the Track Circuits Using Identical Frequency in Railway Track Circuit System (철도궤도회로시스템에서 동일한 주파수를 사용하는 궤도회로 사이의 이격거리에 대한 연구)

  • Kim, Min-Seok;Lee, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.11
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    • pp.2168-2174
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    • 2009
  • Electrical railway system consists of rolling stock, track, signal and streetcar line system. Track circuit system is a vital system due to checking the location of trains. Track circuits are divided by using frequency and isolated electrically. Currently, there is not a regulation for the distance between track circuits using identical frequency. In case of installing additional track circuits in large stations or marshalling yard, the problem which is that the signal is not exactly transmitted to the track circuit occurs due to the mutual interference. In other words, the track circuit properly is not operated on account of wrong induction current by the mutual inductance between track circuits. In this paper, we suggest the electrical model between track circuits and numerically calculate demanded parameters in electrical model. The distance between track circuits satisfying the mutual inductance which does not happen to the mutual interference phenomenon is presented about the distance of track circuit. It is proved by using Matlab and PSpice program as the amplitude of mutual induced current.

Study on the Operating Characteristics of High Voltage Impulse Track Circuit (고전압 임펄스궤도회로의 동작특성 연구)

  • Lee, Tae-Hoon;Park, Ki-Bum;Jeon, Yong-Joo;Ryu, Young-Tae
    • Proceedings of the KSR Conference
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    • pp.1279-1284
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    • 2008
  • This paper presents the operating characteristic of high voltage impulse(HVI) track circuit owing to the ill-contact of impedance bond lead wire. The characteristic operations of the track include rail voltage and current. Measurements are carried out using oscilloscope with current probe and it analyzed the abnormal operation due to connector of protective wire. Finally, suitable track circuit is proposed for conventional line, and operating characteristic of HVI track circuit is affected by bypass circuit.

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A Study on the location of Compensation Capacitor and Capacitance in the Concrete Slab Track (콘크리트 슬래브궤도에서 보상 커패시터의 위치 및 전기용량에 대한 연구)

  • Kim, Min-Seok;Lee, Sang-Hyeok;Ko, Jun-Seog;Lee, Jong-Woo;Jo, Su-Ik;Yu, Jin-Young
    • Proceedings of the KSR Conference
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    • pp.879-891
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    • 2009
  • Impedance of rails is increased by the magnetic coupling between rails and reinforcing bars in the concrete slab track. Currently, the current of track circuit has been compensated by installing the compensation capacitors on track circuit because of increasing the impedance of rails. In case of a rapid transit railway, the compensation capacitors are installed every 20[m] to compensate the current of track circuit in the concrete slab track. Because the interval of one block for a rapid transit railway is as long as 1500[m], the compensation capacitors are installed about the number of 70$\sim$75 on track circuit. However, in case the compensation capacitors are broken over the number of three, it is a problem that the amplitude of current is under standard amplitude of current which is 0.8[A]. In this paper, it was suggested installing a compensation capacitor by using resonance phenomenon on the concrete slab track. We represent the electrical model of track circuit and the four terminal network, calculate the parameters demanded for the electrical model in the concrete slab track. Also, we computed the position and capacitance of the compensation capacitor about 2040[Hz], 2400[Hz], 2760[Hz], 3120[Hz] which currently is the track circuit frequency in the Gyeongbu rapid transit railway and demonstrated the validity of it, using the Matlab and PSpice program.

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The Advantage of renovation from Track Circuit Based Train Control to Communication Based Train Control (궤도회로기반 시스템에서 통신기반 시스템으로의 개량사업에 대한 장점)

  • Min, Jun-Sung;Lee, Jin-Haeng;Kang, Lee-Teag;Yoo, Young-Jun
    • Proceedings of the KSR Conference
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    • pp.1327-1332
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    • 2008
  • Nowadays, the technology development of communication and system engineering should impact on the Train Control System(TCS). The one of main developments in TCS is the Communication Based Train Control(CBTC), which does not depend on the track circuit. Currently, there are the project to modernize TCS as CBTC system from the track circuit system around the world. In Korea, there are the new CBTC system revenue projects such as Busan-Gimhae LRT, Sin-Bundang Line, and so on. There is also Government project called Maglev Line in Daejeon, which is applied CBTC system. Through the examples of world TCS renovation, it is expected to modernize the track circuit TCS system as CBTC system in Korea. Therefore, we would express the advantage of developing from the traditional TCS system to CBTC TCS system.

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Technical Consideration of Non-Insulated Audio Frequency Track-Circuit Device (무절연 가청주파수(AF) 궤도회로장치에 관한 고찰)

  • Cho, Bong-Kwan;Kim, Jong-Ki;Hwang, Hyeon-Chyeol;Ryu, Sang-Hwan;Kang, Shin-Ju
    • Proceedings of the KSR Conference
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    • pp.1709-1715
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    • 2011
  • A track-circuit device exploits two rails as a conductor of an electrical circuit. It detects the presence or absence of the trains with variation of received level when wheel sets of the train shunt rails together. So, it plays an important role in train operation. Non-insulated audio frequency(AF) track-circuit device can separate the rails into tracks by insulated joints without physically cutting the rails. And it transmits AF signals at track boundary, of which frequency is different between adjacent tracks. It has been employed at station-to-station section of domestic high speed rail, general rail, and subway. But It was not used at station yard of complicated general railway where lots of branches exist. In this paper, we consider current development status of non-insulated AF track-circuit device for the use of station yard.

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Study on Test methods and Procedures of Hybrid Track Circuit (하이브리드 궤도회로 시험방법 및 절차에 관한 연구)

  • Kwon, Bu-Seok;Jung, Ho-Hung;Lee, Key-Seo;Li, Chang-Long
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.3
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    • pp.335-342
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    • 2014
  • In this paper We study on test methods and procedures for Hybrid Track Circuit's practicalization. It's possible to apply to HTC's Seoulmetro and high-speed train by proposing test method considering special rail environment and RFID tag and leader, antenna We also present the test methods and procedures for safe and reliable of interface among the Hybrid track circuit devices.

Effect Analysis for Track Circuit affected by Track Structure and Material (궤도구조 및 재료가 궤도회로에 미치는 영향 분석)

  • Park, Dae-Geun;Kim, Jung-Hun;Kim, Jae-Hak;Kang, Young-Jong
    • Proceedings of the KSR Conference
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    • pp.1724-1728
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    • 2008
  • Track circuit is transmitted throughout the rails. In order to insure safe and reliable operation of track circuits, the track and the environment should respect mandatory electrical characteristics. In addition, for cab signalling through track Circuit as per TVM 430, these electrical characteristics should insure the transmission to the train. Track circuits have several operation and safety functions. They can detect the train position and broken rails. When track circuits are used as track to train transmission, they also have to be powered enough to be captured by the train sensors.

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The Influence of Energy Density upon Detection Time of Information Signal in AF Track Circuit (AF궤도회로에서 에너지 밀도가 정보신호 검출시간에 미치는 영향)

  • Kim, Min-Seok;Hwang, In-Kwang;Lee, Jong-Woo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.60 no.6
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    • pp.1146-1151
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    • 2011
  • There are two methods for train control in information transmission by using track circuit system and installing wayside transmitter. Information signal is transmitted to the on-board antenna by using rails. Continuous information about train intervals, speed and route is received by on-board antenna in AF track circuit system. The information signal is included with carrier wave and received by magnetic coupling in the on-board antenna. Therefore, it is important to define standard current level in the AF track circuit system. When current flowed to rails is low, magnetic sensors are not operated by decreasing magnetic field intensity. Hence, SNR is decreased because electric field intensity is decreased. When the SNR is decreased, there is the serious influence of noise upon demodulation. So, the frequency of information signal is not extracted in frequency response. Thus, it is possible to happen to train accident and delay as the information signal is not analyzed in the on-board antenna. In this paper, standard energy density is calculated by using Parseval's theory in UM71c track circuit. Hence, detection time of information signal is presented.

A Study on Interference between High Voltage Impulse Track Circuit(HVITC) and AF Track Circuit (고전압임펄스궤도회로(HVITC)와 AF 궤도회로간의 간섭에 대한 연구)

  • Lee, Hee-Jin;Lee, Jong-Woo
    • Journal of the Korean Society for Railway
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    • v.18 no.3
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    • pp.232-240
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    • 2015
  • Two types of track circuits are used in high speed railway car depots: one is High Voltage Impulse Track Circuit(HVITC); the other is AF track circuit. HVITC detects train occupation of blocks and broken rail; the AF track circuit is used for train onboard control system pretesting before departure. This testing is used to transmit train control information through the AF track circuit. The two systems are switched in turns for testing. We propose a system in which the AF track circuit is replaced by a loop cable that is installed on the inside rail; as such, engineers do not need to switch the systems. In cases in which the two systems run simultaneously, mutual interference may occur. In this paper, we identified this mutual interference by modeling of the two circuits.