• Title/Summary/Keyword: Messenger Wire

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A Study on The Expansion and Contraction in Accordance with Temperature Change of Contact Wire and Messenger Wire (온도 변화에 따른 전차선 및 조가선의 신축에 관한 연구)

  • Yoon, Yong-Han;Yim, Geum-Kwang
    • Proceedings of the KSR Conference
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    • 한국철도학회 2006년도 추계학술대회 논문집
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    • pp.587-592
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    • 2006
  • This paper presents expansion and contraction in accordance with temperature change of contact wire and messenger wire. The tensioning device is designed and installed to pull the contact wire and messenger wire straight at all times. Pulling a contract wire straight ensures that smooth contract is maintained between the contact wire and pantograph of an electric train, and this makes it possible to ensure a stable supply of electricity to the train. Normally, tensioning devices are installed at two positions over a distance of 1.0[km] to 1.6[km] per line. In installing the tensioning device, therefore, it is necessary to study the stroke(the range of the extension/contraction rate of the tensioning device compatible with that of the contact wire and messenger wire due to change in temperature). This paper introduces and discusses this topic.

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The cause analysis of broken accident on messenger wire in catenary system (수도권 전철구간에서 발생한 조가선 절단원인 분석)

  • Jang Dong-Uk;Lee Ki-Won
    • Proceedings of the KSR Conference
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    • 한국철도학회 2003년도 추계학술대회 논문집(III)
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    • pp.552-557
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    • 2003
  • The catenary system used in urban electrification railway have suffered mechanical and chemical stresses. These brought out severe messenger wire problems, these have caused accident. Especially, messenger wire is severely influenced by corrosion, vibration and tension. This paper investigate for the cause analysis of broken accident on messenger wire in catenary system. To analyze the cause analysis of accident, we have conducted experiment such as XRD, SEM, EDX and tensile test.

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Prediction on Fatigue Life of Messenger Wire with Service Environments (사용환경에 따른 조가선의 피로수명 예측)

  • Chang Seky;Kim Yong-Ki
    • Journal of the Korean Society for Railway
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    • 제8권6호
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    • pp.525-532
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    • 2005
  • Fatigue life of catenary wires in various environments is reduced when stress is concentrated on some points, which are often found in corroded areas by surrounding pollutants. Therefore, the fatigue test were performed in order to investigate the effect of the surface corrosion on the destructive behavior in service environment and accelerated corrosion environment as well as th examine the corrosive property and mechanism of the catenary wires. In the fatigue test of the messenger stranded wire, the corrosion degraded materials showed 35~50% of fatigue life at a same stress amplitude compared to original material. Because the catenary wires have variable load by the interaction of periodic contacts with pantographs the maximum stresses of trolley wire and messenger wire calculated by simulation at the messenger wire during operation was estimated thought the corrosion behavior interpretation of variable stress and fatigue test.

A Study on the Protect Measures and Impact of Electric Pole for Abnormal Tension of Messenger Wire (조가선 이상 장력 작용에 대한 전주의 영향 및 보호 대책 연구)

  • Oh, Hun
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • 제20권3호
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    • pp.78-83
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    • 2006
  • In this study, we analyzed the influence or electrical pole by FEM(Finite Element Method) and developed protective system by designing and interpreting protective system for electrical pole when abnormal strength worked on messenger wire. Protective system did not shed messenger wire under wind pressure and discontent load but did assign a part to preventing rupture of electrical pole through automatically shed messenger wire over fred strength. Structure of protective system analysis by FEM and prove property by measuring tensile strength for practical product.

Performance and Evaluation of the Messenger Wire stranded by Copper-Clad Steel Conductors for High Speed Electric Railway (동복강선을 적용한 고속선용 조가선의 성능 및 평가 방안)

  • Lee, Chang-Young;Baek, Seung-Koo;Kwon, Sung-Tae;Kim, Jeong-Guk;Chang, Sang-Hoon
    • Proceedings of the KSR Conference
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    • 한국철도학회 2007년도 춘계학술대회 논문집
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    • pp.875-880
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    • 2007
  • Due to increasing demands for environment-friendly railway system, bronze wires with cadmium, which is a potential environmental hazard, have been no longer permitted as messenger wire for electric railway system. One of materials being considered as the replacements is copper-clad steel conductor(CCSC), which is currently used as contact wire for high speed operation in the Japanese shinkansen. However, there have been few studies for the application as messenger wire by the CCSC. This study deals with requirements and performances of the messenger wire stranded by the CCSC, especially for high speed electric railway. And the tentative evaluation items and methods to be specified as the Korean railway standard(KRS) are proposed.

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Analysis of Communication Characteristics on Contact wire and Messenger wire of Electric Railroad for Power Line Communication (전기 철도의 전력선 통신을 위한 전차선과 조가선의 통신 특성 분석)

  • Lee, Hui-Jun;Ahn, Seung-Ho;Kang, Seung-Wook;Lee, Jong-Gu
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • 제24권10호
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    • pp.157-162
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    • 2010
  • Power line communication, using 25[kV] high voltage of railway catenary, is to provide information which is real-time safety information for train operations and train workers in driving. Lots of noise were occupied in the contact wire by electrical and communication equipments. A signal attenuation was caused characteristics of the contact wire and messenger wire. For relaying communications to transmit information using the contact wire, catenary the noise and signal attenuation were investigated. And the final goal of the study was realized to transmit video information by power line communication on electric railway.

The Characteristic of Data Transmission for Power Line Communication using an AC Arrester for Electric Railway (전철 피뢰기를 이용한 전력선 통신 데이터 전송 특성)

  • Kim, Jae-Moon;Ahn, Seung-Ho;Kim, Yang-Su;Kim, Chul-Su
    • The Transactions of The Korean Institute of Electrical Engineers
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    • 제61권3호
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    • pp.497-502
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    • 2012
  • Power line communication(PLC) is a kind of communication technology, was made use of controling a frequency narrow band, but as the PLC technology developing, in the near future get to the commercial step that is broadband PLC upto 30 MHz. This paper deals with the PLC of electric railway using capacitive signal coupler. An AC arrester for catenary is used as a capacitive signal coupler, has the characteristic of capacitor. As a result of field test, a messenger wire used PLC contain much of conducted noise about overall frequency band and also signal attenuation rate increased with increasing frequency between two points. and the communication speed of PLC used messenger wire is 793kbps at a distance of 40m. Experimental results show the possibility of PLC using a messenger wire and an AC arrester for catenary at electric railway.

Protect Measures and Impact of Electric Pole for Abnormal Tension of Messenger Wire (전력선 벤드 장력 작용에 대한 전주의 영향)

  • Cho, Hyeon-Seob;Kim, Young-Cho;Kim, Sung-Woon
    • Proceedings of the KAIS Fall Conference
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    • 한국산학기술학회 2006년도 춘계학술발표논문집
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    • pp.302-306
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    • 2006
  • In this study, we analyzed the influence of electrical pole by FEM(Finite Element Method) and developed protective system by designing and interpreting protective system for electrical pole when abnormal strength worked on messenger wire. Protective system did not shed messenger wire under wind pressure and discontent load but did assign a part to preventing rupture of electrical pole through automatically shed messenger wire over fixed strength. Structure of protective system analysis by FEM and prove property by measuring tensile strength for practical product.

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A Study on the Network Design of Electric Railway for Power Line Communication (전기철도의 전력선 통신망 설계에 관한 연구)

  • Kim, Jae-Moon;Kim, Yang-Su;Ahn, Seung-Ho;Lee, Hui-Jun;Lee, Jong-Gu
    • Journal of the Korea Academia-Industrial cooperation Society
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    • 제11권10호
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    • pp.3756-3760
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    • 2010
  • In this paper we propose network design for power line communication of electric railway using messenger wire. we carried out feasibility study on the power line communication(PLC) using Contact wire and messenger wire which are required at electric railway. First of all, full-duplex data communication was implemented using coupler which is suspended on messenger wire at non-voltage state. We verified data transfer rate was found to be good, and then proposed a design example of PLC network as the main components for PLC. we will study continuously make an effort to verify on the network design of PLC for further study.

Acquiring Credential and Analyzing Artifacts of Wire Messenger on Windows (Windows에서의 Wire 크리덴셜 획득 및 아티팩트 분석)

  • Shin, Sumin;Kim, Soram;Youn, Byungchul;Kim, Jongsung
    • Journal of the Korea Institute of Information Security & Cryptology
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    • 제31권1호
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    • pp.61-71
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    • 2021
  • Instant messengers are a means of communication for modern people and can be used with smartphones and PCs respectively or connected with each other. Messengers, which provide various functions such as message, call, and file sharing, contain user behavior information regarded as important evidence in forensic investigation. However, it is difficult to analyze as well as acquire smartphone data because of the security of smartphones or apps. However, messenger data can be extracted through PC when the messenger is used on PC. In this paper, we obtained the credential data of Wire messenger in Windows 10, and showed that it is possible to log-in from another PC without authentication. In addition, we identified and classified major artifacts generated based on user behavior.