• 전기학회논문지
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• 제62권1호
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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.

• 전기학회논문지
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• 제58권11호
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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.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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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.

• 한국철도학회논문집
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• 제13권5호
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• pp.500-503
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• 2010

지금까지 궤도회로는 레일을 전기회로의 일부로 사용하여 열차의 위치 검지용으로만 사용하였으나 철도차량이 고속화 되면서, 지상신호의 한계를 극복하기 위하여 차상신호시스템의 사용이 일반화 되어가고 있다. 궤도회로의 전원은 직류나 고전압 임펄스를 사용하던 방식에서 가청주파수를 사용하는 고주파 교류궤도회로의 사용이 일반화 되고 있다. 철도도상도 환경과 궤도의 유지보수성 개선을 위하여 철근콘크리트 도상의 사용이 증대되고 있다. 철근 콘크리트 도상에서 고주파 교류궤도회로를 사용할 경우 도상의 내구성 향상을 위하여 사용되는 수많은 격자모양의 철근들로 인하여 전기적 절연에 의한 누설전류가 아닌 자기결합에 의한 손실로 인한 궤도정수의 변화를 초래할 수 있다. 본 논문은 철근콘크리트도상에서 AF(Audio Frequency)궤도회로를 사용하였을 경우 도상 철근에 의한 궤도회로신호의 영향과 손실을 시뮬레이션을 통하여 알아보고 이를 방지할 수 있는 방안을 제시하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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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.

• 전기학회논문지
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• 제62권4호
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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.

• 전기학회논문지
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• 제61권5호
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• pp.698-704
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• 2012

Electric power used in electrical vehicles flows into the substation through the feedback circuit, track circuit. Due to these power conversion equipments in electrical railroads, return current contains harmonics, and it should not affect other communication lines. In this paper, based on the return currents, we measured harmonics and analyzed an influence in railway equipments due to the harmonics. For analysis, we utilize the measured values of return currents measured in track circuits, and predictive values of those compared to the earth methods between the existing electrified sections. Applying the regulations used for Gyeongbu HSL(High Speed Line), the results of measured harmonics have found to be acceptable.

• 전기학회논문지
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• 제60권6호
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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.

• 전기학회논문지
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• 제65권7호
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• pp.1303-1310
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• 2016

The track circuit carries out a train detection using a electrical closed loop, and incidentally it detects the rail rupture using the track circuit current flowing rail. However, in the case of the axle counter or the Radio based train control system, it requires a new way for detecting the rail rupture because of not using the track circuit. To solve this problem, it periodically checks non-steady state of rail by the track inspection car. but real-time detection of the rail rupture is impossible. Therefore, this paper analyzed feasibility to realize a real-time detection of rail rupture by using the return current.

• 한국통신학회논문지
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• 제42권5호
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• pp.1110-1116
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• 2017

동작 특성에 따라 궤도회로 장치는 신호기 장치, 선로전환기 및 기타 안전과 관련된 장치의 직접 또는 간접 제어를 위해 설치되며, 주로 열차의 검지, 지상에서 차상으로 제어정보 전송, 궤도 깨짐 검지 및 귀선 전류 전송에 사용된다. 특히 귀선 전류는 신호시스템, 전력시스템 및 전차선 및 궤도회로장치와 관련이 있다. 신호시스템에서 가장 중요한 구성 요소 중 하나인 귀선 전류는 선로변 유지보수자의 안전 및 전철화에 따른 철도 관련 전기시스템의 보호를 위해 적합하게 처리되어야 한다. 따라서, 과전류 상태로 인한 귀선 전류 불평형과 시스템 유도 장애 및 고장을 방지하기 위해서는 귀선 전류의 정확한 분석이 필요하다. 또한, 귀선전류 고조파에 의해 오동작이 발생하면 열차 운행 중단 등의 문제가 발생될 수 있다. 본 논문에서는 이러한 귀선 전류 측정 및 분석 방법을 제시하고 고속열차 운행에 따른 호남고속철도 노선에서의 귀선전류 고조파 시험 결과를 제시하고 있다.