• Title, Summary, Keyword: Existing catenary

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A prediction of maximum operation speed for the catenary using tunnel bracket (터널 브래킷을 사용한 가선시스템의 최고속도 예측 및 검토)

  • ;;;M'hamed Matri
    • Proceedings of the KSR Conference
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    • pp.628-635
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    • 2000
  • The catenary system supported by the tunnel bracket which has been used uniquely in KNR was selected as the catenary inside narrow existing tunnel in the electrification of Kyeung-Bu Line for operation of Korea High Speed Train(KTX). It was demanded to judge the maximal operable speed of KTX in this catenary system to implement the planning. To do this, the tunnel bracket was firstly tested to obtain the characteristic data. The stiffness of this bracket are computed depending on the location which catenary installed on. Moreover, the catenary using tunnel bracket is modelled numerically respecting the bracket stiffness. Based on these, the dynamics between this catenary and KTX pantograph are simulated with the program developed by ourselves independently. The simulation result are evaluated according to the generally acceptable criteria. Consequently, the maximal operable speed of KTX in the catenary using KNR(Korean National Railroad) tunnel bracket is predicted and some items which are needed to be kept in the processing of implementation are drawn.

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Development of the catenary system for the narrow tunnel with design speed of 160km/h (160km/h가 가능한 협소터널용 터널가선시스템 설계 및 개발)

  • 권삼영;조용현;창상훈;이희성
    • Proceedings of the KSR Conference
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    • pp.509-515
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    • 2002
  • While performing the advisory services of the electrification of conventional lines for KTX(Korea High Speed Train), we faced the speed-up problem of catenary system for the existing narrow tunnel. To solve this problem, the new system, to be named "Oblique encumbrance tunnel catenary", was developed. This system is mainly characterized by a simple catenary type, a dual bracket, a oblique encumbrance, a small system height and the same bracket used for the radial tension load and compression one. In this paper, the basic concepts, overall system configuration and main points considered in a design phase for the ′oblique encumbrance tunnel catenary′ are described. Moreover, the detail design criteria and other contents like manufacturing pilot products and verifying the performance through a factory and site test are added.

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Study on Enhancing Lightning Protection Scheme of Catenary in Subway Viaduct Section

  • Li, Rui-Fang;Chen, Kui;Chen, Li-Sheng;Cao, Xiao-Bin;Wu, Guang-Ning;Zhang, Xue-Qin
    • Journal of Electrical Engineering and Technology
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    • v.12 no.2
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    • pp.950-958
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    • 2017
  • Viaduct increases the height of subway catenary, namely magnifies lightning attraction scope that lead to higher possibility of suffering lightning stroke. Therefore, it is necessary to analyze performance of lightning striking to catenary of subway in viaduct section and propose an improving lightning protection scheme. In this paper, using ATP-EMTP simulation software to establish an associated model to evaluate lightning withstand level of catenary with existing lightning protection schemes including arrester and grounding point, an improving lightning protection scheme is proposed - every pillar ground earth and arresters are installed with some installing spacing between 200m to 400m based on lightning damage degree and reliability requirements - according to analyzing results: while lightning withstand level is lowest for lightning striking to the neutral pillar, lightning withstand level is greatest for lightning striking to the both-ends pillar that arrester and grounding point are both installed; grounding point could obviously improve lightning withstand level for lightning striking to ground wire while arrester could obviously improve the lightning withstand level for lightning striking to catenary; every pillar ground earth could enhance the lowest lightning withstanding level up to 2.5 times than of that pillar ground earth across every 200m.

A Study on the Geometry Change for the Increased Contact Wire Tension in the Pre-sagged Existing Catenary (사전 이도가 주어진 기설 전차선로에서 전차선 장력을 증가시켰을 때 전차선 기하학적 형상 변화 연구)

  • An, Seung-Hwa;Kim, Yoon-Ho
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.447-453
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    • 2012
  • It is studied that the structure of the contact plane geometry of the contact wire would be changed when the contact wire tension is increased in the existing overhead contact lines for the purpose of improving the operation speed temporarily. In this paper, the dropper length formula which could be well applied to the pre-sagged catenary is reviewed first. Second, the changing amount of the pre-sag if the contact wire tension change from 20kN to 23kN or from 20kN to 25kN for the Gyeongbu HSL(high speed line) 49.5m catenary is evaluated by using of the self-written program in accordance with the dropper length formula. Moreover, the increasing tension and measuring the pre-sag change experiment in the Gyeongbu 2 HSL was conducted. The calculated data are compared with the measured data. As a result, it is found that the geometry change is very little and will not make the current collection performance deteriorated.

A study on better wire protector of equipment on the Circulating Current in Catenary System (순환전류에 대한 전철설비 보호카바 개선 연구)

  • Kang, Seung-Wook;Kim, In-Chol;Kim, Hyo-Jin;Kim, Dae-Sik;Baek, Seong-Hyun;Han, Sang-Ok
    • Proceedings of the KIEE Conference
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    • pp.375-378
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    • 2007
  • In these days, Korea Railway apply simple catenary system to general lines and high speed lines of Korea Electric Railway. Circulation Current in catenary system frequently bring undesirable consequences. Namely, the Connector wire has many problems according to a flow of excessive circulation (or traction current) and a sudden rise of temperature on catenary when electric car or locomotive is running in high speed. The occurrence of events by the load increasement do considerable damages to peoples, organizations and systems. On a case by case accidents, the reeltype protective cover as part of various methods has some problems. In this project, we proposed the improved changes on the catenary system of a improvement and change of a messenger wire protector, improvement of connector wire's institution angle and of a replacement the connector wire with a dropper. Its tridimensional space limitation dictated the scale of the $32{\times}{\Phi}55$ to be as small as possible. It is easier to install than work by the existing cover on the messenger wire.

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Structure of Integrated Adaptive Catenary Inspection System for Improved Safety (안전성 고도화를 위한 융합-가변형 전차선 검측시스템의 구조)

  • Kim, Ji-Yoon;Kim, Jung-Phyung;Kim, Woo-Saeng
    • Journal of the Institute of Electronics and Information Engineers
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    • v.52 no.9
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    • pp.147-152
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    • 2015
  • Almost all existing inspection methods for catenary system have relied on dedicated track inspection cars. Two factors make it necessary to modify the conventional method: First, the climate has become increasingly similar to that of a subtropical area. In addition, high speed trains have been developed that can run as fast as 450Km/h. This paper presents a visual catenary inspection system structure that incorporates roadbed information for high-speed running environments. Conventional catenary inspection systems determined the degree of wearing only for the trolley wire. The facility inspection system presented in this paper on the other hand utilizes visual and sound data of inspection targets and adjusts inspection frequency and sensitivity depending on the geographic data.

Analysis of Catenary-Pantograph Motion by Green's Function (그린 함수를 이용한 가선-판토그래프 계의 운동해석)

  • 임진수
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.8
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    • pp.1438-1445
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    • 1992
  • A new and efficient method is presented to evaluate contact force and motion of an electric railway simple catenary-pantograph system. Overhead lines are regarded as simple strings, and hangers connected to the strings are replaced with concentrated forces acting on them. The displacement of strings due to concentrated forces caused by hangers and pantograph is expressed using Green's function. A system of linear algebraic equations in terms of unknown forces is derived based upon the compatibility requirement at the location of hangers and pantograph. This procedure is more analytic in formulation compared to the existing methods such as finite difference method or normal modes method, and it is expected to be more accurate. Present method has additional advantage that it requires neither numerical differentiation nor system eigenvalues.

Wind-induced aerostatic instability of cable-supported bridges by a two-stage geometric nonlinear analysis

  • Yang, Y.B.;Tsay, Jiunn-Yin
    • Interaction and multiscale mechanics
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    • v.1 no.3
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    • pp.381-396
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    • 2008
  • The aerostatic instability of cable-supported bridges is studied, with emphasis placed on modeling of the geometric nonlinear effects of various components of cable-supported bridges. Two-node catenary cable elements, which are more rational than truss elements, are adopted for simulating cables with large or small sags. Aerostatic loads are expressed in terms of the mean drag, lift and pitching moment coefficients. The geometric nonlinear analysis is performed with the dead loads and wind loads applied in two stages. The critical wind velocity for aerostatic instability is obtained as the condition when the pitching angle of the bridge deck becomes unbounded. Unlike those existing in the literature, each intermediate step of the incremental-iterative procedure is clearly given and interpreted. As such, the solutions obtained for the bridges are believed to be more rational than existing ones. Comparisons and discussions are given for the examples studied.

A Study on Fault Location Estimation Technique Using the distribution Ratio of Catenary Current in AC Feeding System (전차선 전류 분류비를 이용한 교류전기철도 고장점 표정기법에 관한 연구)

  • Jung, Ho-Sung;Park, Young;Kim, Hyeng-Chul;Min, Myung-Hwan;Shin, Myong-Chul
    • Journal of the Korean Society for Railway
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    • v.14 no.5
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    • pp.404-410
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    • 2011
  • In AC feeding system, the fault location is calculated by using ratio of current absorbed in the neutral point of AT(Automatic Transformer) or by measuring reactance. In this way, however, an estimation error can be happened due to the many reasons. In addition, for measuring currents in the neutral point of AT, other measuring devices and communication equipments are additionally required. In order to solve the disadvantages, this paper suggests a novel technique using the distribution ratio of catenary current. The proposed technique uses existing protective relays and measures catenary current. With the measured data, we can calculate the distribution ratio of catenary current and determine fault location. Through the simulated results, we derived the correlation between current ratio and fault location. Using this technique, additional equipments and expenses can be reduced. Besides, fault location can be determined more correctly.

Technical specification of Electric Multiple Unit with Tilting Express (전기식 틸팅차량(TTX)의 구성 및 기술사양)

  • Han Seong-ho
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.30-33
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    • 2004
  • This paper suggested that the technical specification of tilting train EMU for speed up on existing lines. High speed strategy of existing lines are the modification of railway system which are made on cant, lengths of transition curves, the catenary system and train system. Tilting technology is more useful a strategy for speed increases on existing lines with low investment needed. We performed a feasibility study which is considered out real track conditions and designed propulsion and braking system of tilting EMU system.

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