• Title/Summary/Keyword: Catenary system

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A Study on the Trolley Sliding Condition Inspection System

  • Chang, ChinYoung;Kim, ChanSam;Jung, NoGeon;Na, YeonIl;Kim, YangSu
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.109-112
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    • 2015
  • The Korean electric railway is growing rapidly such as speed of 300km/h in high speed section and 230km/h in the conventional railway section. But, power supply failure occurs because of loss of contact, defective catenary system and high speed vehicle. Therefore preventive maintenance way based reliability has been applied. Typical example is the facility inspection method using trolley inspection system. But it is required differentiated inspection method to prevent problem such as inspection errors. In this paper, a study on the trolley sliding condition inspection system using monitoring techniques is performed for performance enhancement of inspection system. It proposed the efficient maintenance method through monitoring the deviation and height of contact wire after installing inspection system on the top of train which operates in the metropolitan area. Inspection errors were decreased by virtually monitoring the video of faulty facilities. Also those facilities were identified through the impact sound analysis and tests at the main catenary section.

Simulation of the Dynamic Interactions between Catenary and Pantograph (전차선과 팬터그래프 사이의 동적 상호작용 시뮬레이션)

  • Kwon, Sam-Young;Kim, Gil-Sang
    • Proceedings of the KIEE Conference
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    • 1995.07a
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    • pp.455-459
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    • 1995
  • Catenary/pantograph system consists of overhead lines which have non-uniform elasticity and pantographs which move at high speed and give force to the lines, therefore happen to be failed in contacts between both from time to time. In this study, as the first step to develop a dynamic simulation program, the general theory is discussed for catenary/pantograph system and appropriate modelling. And comparison is conducted with the references after making a program which referred to the contact force equation algorithm. On this algorithm, the unknown contact force is computed by the equations which was induced as combining catenary and pantograph motion equations expressed in finite difference form. Another simulation program based on the assumed contact forces algorithm was developed. In this algorithm, numerical integraion of both the overhead line and pantograph equations, which without combining, are effected for two assumed values of contact force. The correct contact force is then obtained from these two sets of results by linear interpolation to satisfy the contact condition. Through the comparative review on the outputs from this program, it is verified that this algorithm is reliable.

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The Effect of Regenerative Energy Storage System on Stabilization of Electro-Pneumatic Braking Blending (회생에너지 저장시스템이 제동 브랜딩 안정화에 미치는 영향)

  • Kim, Kyu-Joong;Lee, Keun-Oh
    • Journal of the Korean Society of Safety
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    • v.25 no.5
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    • pp.15-21
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    • 2010
  • Regenerative Energy Storage System(ESS) is a system that saves regenerative energy which generated instantly in the regenerative braking of Electric Multiple Unit(EMU) and disappear, and reuse the stored energy when EMU is in powering. Such system related to a research field of renewable energy which emerged concerning climate change and high oil prices. In the case of existing domestic rolling stock, about 25% to 30% of generated regenerative energy is restored to power source and is regarded as direct factor of raising catenary voltage. Such rapid change of catenary voltage is a cause of the failure of EMU's electronic equipment and lowering its reliability and is also a cause of train's fault occurred by tripping circuit breaker. In this paper, we intend to investigate the effect on blending characteristics of electric-braking and pneumatic-braking whether the regenerative energy storage system is used or not in urban transit DC 1,500V feeding system, while trains run. And we also intend to investigate its effect on stabilization of the blending, fluctuation of catenary voltage and various electric equipments.

Estimation and Measurement of the Traction return current on the electrified Gyeongbu line.

  • Kim, Y.K.;Yang, D.C.;Han, M.S.;Ryu, C.K.
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.99.5-99
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    • 2001
  • This study presents a simulation of the traction return current based on $2{\times}25kV$ power supply system in order to determine the impedance bond intensity of impulse type track circuit on the electrified Gyeongbu line. The results of the simulation enables us to measure the precise intensity of catenary current that returns to the substation through KTX (Korean Train Express) operated by $2{\times}25kV$ power supply system with common earth network. The combination of $2{\times}25kV$ and common earth network established on the electrified Gyeongbu line for the first time in Korea. We show that the relationships among the traction return current, earth current, and catenary current, and catenary current can be applied to this line in order to determine the optimal impedance bond intensity ...

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Feasibility Study through Simulation of LSM Propulsion System for the Catenary-current Collection Run Tester (전차선로-집전계 주행시험기의 LSM 추진장치의 타당성 검토 시뮬레이션)

  • Kwon Sam-Young;Lee Hyung-Woo;Prak Hyun-June;Lee Ju
    • Journal of the Korean Society for Railway
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    • v.9 no.4 s.35
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    • pp.343-348
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    • 2006
  • In this paper, as a conceptual design of the catenary-current collection run tester which is planning to be constructed by KRRI, the feasibility study is described. In this study, reviews to determine the propulsion linear motor rating based on the target distance-speed curve through various simulation of LSM propulsion system were conducted. Moreover, the reviews of simulation results and desirable linear motor specifications are discussed in this paper.

Variation Trends of the Contact Force between Pantograph-Catenary and Acceleration Behavior According to the Train Running Speed and Driving Pattern in Korean High Speed Train (열차의 운행패턴과 속도에 따른 한국형 고속전철용 판토그라프의 접촉력과 가속도 거동의 변화 경향)

  • 목진용;김영국;박춘수;김기환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.200-205
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    • 2004
  • The pantograph for Korean High Speed Train was developed and had been evaluating by through 'G7-R&D project for home grown high speed train technology' In this study, in mechanical aspect, the variation trend of contact force between pantograph and catenary according to the train running speed and driving pattern is conducted. A measuring system for current collecting performance and mechanical characteristics is used for this study, developed and installed on the prototype Korean High Speed Train, and physical characteristics were measured while the KHST runs on the test track. Through this study, remarkable trends of variation are found and analyzed from measured acceleration and vertical contact force between the pan head in pantograph and contact wire in catenary system according to the driving pattern and the train raised a running speed up to 300km/h.

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A study on the correlation between the degree of elasticity uniformity and the dynamic performance in the overhead contact lines (전차선로 탄성도 불균일율과 동역학적 성능과의 관계에 대한 연구)

  • Park, Sa-Hoon;Kwon, Sam-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.11a
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    • pp.502-502
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    • 2007
  • A catenary system should be designed to have an uniform elasticity over a span in order to maintain the lowest possible loss of contact between a pantograph and a contact wire. A elasticity uniformity of a catenary can be regarded as a important design factor used for predicting the current collection performance for a catenary. There are a couple of formulas to calculate the degree of elasticity uniformity of a catenary according to the literature survey. The effectiveness of these formulas is reviewed by performing catenary elasticity and loss of contact analysis for various different configurations of catenary systems using a beam element based FEM program. The results reveals that these formulas are not suitable to predict the current collection performance for a catenary. Therefore, a new formula based on the standard deviation of the elasticity over a span is proposed in this study. The analysis results show that the new formula for an elasticity uniformity of a catenary is very effective in predicting the current collection performance for a catenary.

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A Study on Performance Diagnosis of the Pulley Type Automatic Tensioning Device and Improvement of Maintenance (활차식 자동장력조정장치 성능진단 및 유지보수 개선에 관한 연구)

  • Park, Hyun;Lho, Young Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.1103-1107
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    • 2016
  • The automatic tensioning device of the catenary system constantly maintains the tension of the trolley wire by absorbing the variations due to the elasticity of the line caused by temperature variation. The tension plays an important role in affecting the electric motorcar operation directly. This paper suggests the methodology of the life cycle extension and the maintenance of the automatic tensioning device by means of performance diagnosis of the pulley type automatic tensioning device which has been commonly used for the electric railway system. Through conducting performance diagnosis and comparative test for the wornout pulley type automatic tensioning device by replacing the components such as the bearing and the bearing shaft without replacing all the assembly, the tensioning device is analyzed whether it is properly functioned. Provided that the maintenance regulation is reinforced so as to implement the bearing replacement through periodical precise inspection along with random check-up inspection which is now carried out by the operating organizations, it is ensured that the life cycle extension and the reduction of maintenance cost of the tensioning device could be achieved.

Implementation of Optical-based Measuring Instrument for Contact Wire Geometry in Electric Railway (전기철도의 전차선로 형상검측을 위한 광학기반 검측 장치 구현)

  • Park, Young;Cho, Yong-Hyeon;Jung, Ho-Sung;Lee, Ki-Won;Kim, Hyung-Chul;Kwon, Sam-Young;Park, Hyun-June;Kim, Won-Ha
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.9
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    • pp.868-871
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    • 2008
  • We propose an optical-based measuring instrument of catenary system in electric railway. This system was made to utilize line scan camera as inspecting system to measure the stagger and height of overhead contact wire in railway and composed with optical type source and FPGA-based image acquisition system with PCI slot. Vision acquisition software has been used for the application to programming interface for image acquisition, display, and storage with a frequency of sampling. To check the validity of our approach for the intended application, we monitored height and stagger in the overhead wire of a high-speed catenary system in Korea. The proposed optical-based measuring instrument to measure the contact wire geometry such as the hight and stagger shows promising on-field applications for online condition motoring. We expect that a new generation of real-time instruments with demanding various conditions motoring requirement in railway can be easily integrated into optical-based measuring instrument system.

Analysis of the operation of Fault Locator in aspect of Line Constants by unifying Protect Wires (보호선 통합에 따른 선로정수 측면의 고장점 표정장치 동작에 관한 해석)

  • Lee, H.M.;Chang, S.H.;Han, M.S.
    • Proceedings of the KIEE Conference
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    • 2004.04a
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    • pp.275-277
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    • 2004
  • when a fault occurs, we need the fault locator to find out the location of the fault quickly. The fault locator can find out the exact location of the fault through the line constants of the catenary system. If the configuration of the catenary system is modified, the line constants is also changed. Therefore, this paper analyzes the error of the operation of the fault locator by the simulation.

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