• Title/Summary/Keyword: 전차선로

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A study on identification of the damping ratio in a railway catenary system (철도 가선시스템의 감쇄 특성 파악에 관한 연구)

  • Park Sungyong;Jeon Byunguk;Lee Eungshin;Cho Yonghyeon
    • 한국신재생에너지학회:학술대회논문집
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    • 2005.06a
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    • pp.529-533
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    • 2005
  • A railway catenary system which supplies a train with electric power is an important system in determining the maximum speed of an electric train. However, a pantograph could be separated from a contact wire because of reciprocal action between a pantograph with constant upward force and a catenary system. The contact loss of a pantograph-catenary system is mainly affected by the dynamic characteristics of damping and wave propagation velocity of contact wire. For increasing speed of an electrical train, it is necessary to establish the techniques to identify the modal parameter of a catenary system through experiment. However, it is difficult to decouple each mode and to extract respect ive damping rat io since a catenary system has an extremely high modal density. For this reason, mode decoupling process to identify modal parameters is a principal technique in analyzing a catenary system. In this paper, the damping extract ion method for a catenary system using the continuous wavelet transform is discussed.

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A Study on the Evaluation of Dynamic Characteristics of the Pantograph for the Korean High-Speed Train through 350km/h Trial Running Test (350km/h 본선 주행시험을 통한 한국형 고속열차 판토그라프의 접촉력 특성 평가 연구)

  • Lee Hi-Sung;Mok Jin-Yong
    • Journal of the Korean Society for Railway
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    • v.8 no.4
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    • pp.342-347
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    • 2005
  • The Korean High-Speed Train(HSR 350x) had been developed by through 'G7-R&D project' in 1996-2002, and has been testing and evaluating it's reliability on the high-speed line until now. A number of core equipments designed and developed by using domestic technologies were boarded on the HSR 350x. In order to verify the performance of HSR 350x and core equipments such as traction system, brake system and pantograph, sophisticated testing and evaluating procedures should be considered and applied. In this paper, the tested and analysed results about the dynamic characteristics of HSR 350x pantograph are introduced in a view point of the mean contact force and it's variation trend, criterion of current collection, and up-lifting of contact wire when the MSR 350x running up to 350 km/h. Through the test and evaluation, we verified that HSR 350x pantograph had an excellent current collection performance and good dynamic characteristics as it had been designed.

Investigation of Autotransformer Configuration to Enhance Collecting Voltage in Train (집전 전압 향상을 위한 교류급전시스템의 단권변압기 구성 검토)

  • Kim, Joo-Rak;Kim, Jung-Hoon
    • Journal of the Korean Society for Railway
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    • v.13 no.1
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    • pp.65-70
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    • 2010
  • AC traction power supply system has adopted autotransformer (AT) feeding method. This system has an advantage as long feeding distance. However, the countermeasure for voltage drop should be considered, because load capacity grows larger and headway grows shorter in recent electric railway system. This paper proposes the improved system configuration to enhance voltage drop in ac railway system without additional power electronic device. That is to increase turn ratio between contact wire and rail of AT. By modifying turn ratio of AT at SSP or SP, collecting voltage on train will be enhanced.

Analysis of AT Feeding Systems considering the Voltage Constraint Conditions of the Catenary. (전차선 전압제약조건을 고려한 AT 급전계통 해석)

  • Kim B.;Chung K. W.
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.27-33
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    • 2005
  • Constant load model is generally used for an electric train to perform the static analysis of AT feeding systems. In this model, the train will be considered as a constant load model when it drives or as a constant source model when it applies regenerative brake. However there must be some voltage constraints on the catenary in actual operations. These constraints are established for the reason of protecting the feeding facilities from excessive rise of regenerative braking voltage or guaranteeing the minimum traction power of train. In normal operating situation, the pantagraph voltage of the train should be maintained within these limits. Keeping these facts in minds, we suggest new methods of analyzing AT feeding systems using the constant power models with the conditions of voltage constraints. The simulation results from a sample system using the proposed method illustrate both the states of system variables and the supply-demand relation of power among the trains and the systems very clearly, so it is believed that the proposed method yields more accurate results than conventional methods do. The proposed methods are believed to contribute to the assessment of TCR-TSC for compensating reactive powers too.

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Dilation and Erosion Technique using a Inspection of the Catenary System Design (침식, 팽창기법을 이용한 전차선 검측 시스템의 설계)

  • Kim, Woo-Sang;Jung, Min-Yong;Kim, Ji-Yoon
    • Journal of the Korean Society for Railway
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    • v.9 no.6 s.37
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    • pp.701-704
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    • 2006
  • The catenaries must guarantee the constant electricity to the trains, so that the safety and the estimate of fatigue degree and the inspection of abrasion degree should be done rapidly. This thesis proposes the system that can manage the performance/failure of the catenaries using the image process as the solution for the weak points of the existing inspection such as the decrease of immediateness and the lack of constancy in the human resources. This study simulates the ALD using VHSV (Virture HSV) which is the unreal HSV images, not getting the real HSV in ages to the image processing technique that repeats the erosion and the expansion of the images as the methods that can monitor the slight/critical defects of the catenaries as dealing with the result of the catenaries inspection images. The final ALD (Abnormal Line Detection) system is designed based on this simulation. I have demonstrated it with the VHSV (Virture HSV) virtual images as the materials of the test and inspected it through testing the defects of the catenaries for the thesis.

A Experimental Study on Train Speed and Wave Propagation Speed of Contact Wire according to the Speed-up (속도향상에 따른 열차속도와 전차선 파동전파속도에 대한 실험적 연구)

  • Lee, Kiwon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1820-1823
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    • 2013
  • An overhead catenary system is the one of the main subjects for increasing speed in electric railway. When a vehicle increases the speed over 350km/h, vibrations and wave propagation reflections occur severely. Therefore, the system suitable for the speed are needed. A wave propagation speed of contact wire is the main criteria to determine the tension for the system. Therefore, a train speed is restricted below 70% of wave propagation speed of it in European railway code. In this study, we measured a strain and uplift of contact wire while HEMU-430X tain is operated for the speed-up trial test in Kyungbu high-speed railway. The measured strain and uplift are analyzed with wave propagation speed according to the speed-up. The more a train speed reaches to a propagation speed, the more measured strain is high. Through the study, an experimental approach is performed about the code which a train speed is restricted below 70% of wave propagation speed of it.

Analysis of Contact Loss Arc Spectrum between Contact Wire and Pantograph Material using a Spectrometer (광계측기를 이용한 전차선-팬터그래프 재질별 이선아크 스펙트럼 분석)

  • Chang, Chin-Young;Jung, No-Geon;Park, Jong-Gook;Koo, Kyung-Wan;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.12
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    • pp.1803-1808
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    • 2013
  • To maintain contact between catenary and pantograph copper is important in order to transmit power smoothly on Current collection system. But, Arc discharge with strong light is generated because of contact loss. Therefore, Arc discharge detection is important measurement factor judging performance of current collection system. In this paper, It is described to results of arc discharge applying UV detection technology using arc generator. And Arc discharge was detected using the most commonly used processing catenary and rigid catenary and pantograph copper of electric rolling stock for securing arc detection instrument reliability. Results of contact loss detection instrument in this paper will be used for maintenance of current collection quality and system.

A Study on the Resistance Test Method for Planning Hull Model using the High Speed Towing Carriage (무인고속전차를 이용한 활주선 모형의 저항시험 기법 연구)

  • Lee, Young-Gill;Ha, Yoon-Jin;Jeong, Kwang-Leol;Chae, Soon-Jae
    • Journal of the Society of Naval Architects of Korea
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    • v.51 no.5
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    • pp.349-355
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    • 2014
  • The resistance test of a high speed craft such as planing ship is performed with a high speed towing carriage instead of ordinary towing carriage because of the speed limitation. In the resistance test using high speed towing carriage, the model ship is fixed to the carriage to restrain the running attitude for enough measuring time. Such method is called fixed model test method. In the fixed model test method, to get the appropriate running attitude, the model test is iteratively repeated until the trim moment and lift force are close to zero. In this research, trim free model test method is investigated to reduce the number of iteration. And, the limitation of towing speed range in the trim free model test method is investigated.

Speed-up Design for Overhead-line Considering Contact Force Fluctuations by a Wave Reflection and a Doppler Effect (파동반사와 도플러 효과를 고려한 전차선의 속도향상 설계)

  • Cho Yong Hyeon;Lee Ki Won;Kwon Sam Young;Kim Do Won
    • Proceedings of the KSR Conference
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    • 2004.10a
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    • pp.1353-1359
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    • 2004
  • There are many massive components added on the railway overhead-line. These components cause larger fluctuations of contact forces, which are due to wave reflections and Doppler effects when a high-speed train passes those. In this paper, mathematical formula are derived for the relation between the added mass and contact force fluctuations. Using the derived formula, we calculate a added mass on the overhead-line which cause amplification factor to become 2.5. German design practice requires that amplification factor due to the wave reflection should be less than 2.5 to obtain good current collection performance. To show the validity of the formula, simulation results are compared with the calculation results. Simulation results showed that contact force fluctuations grow rapidly when an added mass is larger than the calculation result. Therefore, the simple form of formula can be used for estimating maximum added mass not to cause large fluctuations of contact forces in early design phase.

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Change to Pain's Level of Chronic Back pain patient With Hamstring Shortening in 27year's old After Application to Active Therapeutic Movement (ATM) and Sling Exercise-Case study (슬괵근 단축이 있는 27세 남자 만성요통환자의 ATM, 슬링운동치료 적용 후 통증수준의 변화-사례연구)

  • Yu, Woung-Sik;Jeon, Cha-Sun;Won, Sang-Hee
    • The Journal of Korean Academy of Orthopedic Manual Physical Therapy
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    • v.15 no.1
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    • pp.64-71
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    • 2009
  • Purpose: to purpose prevent to dysfunction and decrease to pain level use to active therapeutic movement and sling manual, stability exercise in shortening hamstring chronic back patient. Methods: The patient's complain was Buttock and Lower Back Pain due to dysfunction posture work. The subject's initial Pain Scale was 60 of 100(VAS). The Subject Treatment to Sling Mobility exercise, Home exercise, ATM, Sling Stability exercise, sensory motor training During 8weeks for 18 times. Results: The result was Visual Analog Scale(VAS)was decreased 10 of 100 after treatment. Conclusion: Visual Analog Scale(VAS)was decreased 10 of 100 after treatment. Functional Leg Length Was recover to same level. Trunk Flexibility was increase to 18cm. Active Knee Extension ankle was decrease to $15^{\circ}$ limit range of motion due to Lt. Hamstring Shortening limit range of motion $30^{\circ}$. GPS(Gobal Postural System)test was recover to same level. This case study need to sufficient data and times.

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