• Proceedings of the KSR Conference
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• 2007.05a
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• pp.829-835
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• 2007

For constant operation, Electric Railway System has many electrically divided parts of the trolley lines to avoid error spreading. FRP-Section have a role to divide Catenary trolley lines electrically. If one electric train approach to the section at the same time with partial power failure, the pantograph of train can make a short circuit with supplied part to failure part. Electric arc induced with this switching effect, can break FRP-section, and there are such error cases. In this study, we propose one method to prevent FRP-section breakdown from these reason, with detecting sensor at the sectional position.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.21 no.5
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• pp.461-467
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• 2011

This study aims to create a numerical analysis model which can investigate the dynamic interaction between pantograph and overhead contact wire used for a high-speed railway vehicle, and validate the simulation results according to EN 50318 standard. Finite element analysis models of pantograph and overhead contact line are created using SAMCEF, a commercial FE analysis program. The mean, standard deviation, maximum and minimum values of contact forces are obtained. The simulation results are validated according to EN 50318, and the possibility of simulating the collecting characteristic of an actual pantograph system by using the developed model is discussed.

• Proceedings of the KIEE Conference
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• 2004.04a
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• pp.259-261
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• 2004

철도 신호제어장치들은 각자 고유의 기능을 수행하면서 각 장치간 통신링크를 통하여 하나의 신호제어시스템을 구성하고 있다. 특히 철도청에서 통합 CTC 시스템을 구축하면서 신호제어시스템 이외의 SCADA나 여객정보안내 시스템 등 외부설비들과의 인터페이스를 통해 기존의 열차제어 기능만을 수행하는 것에서 타 시스템과의 디지털 통신을 통한 종합적인 정보시스템으로 발전하고 있다. 이러한 CTC장치와 외부설비들간의 인터페이스는 철도정보시스템의 발달에 따라 매우 중요한 부분이 되고 있다. 또한 철도청의 주요 노선들이 전철화되어감에 따라 SCADA 장치의 중요성이 증가하고 있으며, 전차선의 가압상태를 CTC에서 파악하는 것은 열차의 안전은행에 있어서 매우 중요하다. 이에 따라 본 논문에서는 기존의 도시철도, 경부고속철도 등의 프로토콜의 분석을 바탕으로 철도청 통합 CTC와 SCADA 장치간 통신을 위한 프로토콜 구조를 제안한다.

• Proceedings of the KIEE Conference
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• 1995.11a
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• pp.370-372
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• 1995

This paper mainly, describes the electrical characteristics caused by the change of structure in solid state of specimen by electron beam irradiation of high temperature-low expension type molding materials of power semiconductor element. The experiments on physical properties and electrical characteristics for the specimen irradiated electron beam are carried ont. For the investigation on physical properties, XRD analysis is used. And for the experiment of electrical characteristics, measurement of volumn resistivity is used.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.61 no.11
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• pp.1732-1736
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• 2012

To increase speed up of train, in the field of catenary system, it is necessary to develop of new monitoring methods for dynamic interaction between pantograph and contact wire. Also, there is a need to develop technologies that constantly measure are from various railway structure such as uplift of contact wire, vibration of catenary, dynamic strain of contact line in tunnel. In this paper condition monitoring systems for dynamic performance of catenary systems in tunnel were proposed. An advanced method and results of field tests using high speed camera for monitoring of vertical upward movement of the grooved contact wire due to the force produced from the pantograph were presented. The proposed uplift measurement system of contact wire is expected to enhance precision of current collection quality performance assessment methods at high-speed lines.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1601-1602
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• 2015

전력계통에서 진상역률이 될 경우, 경부하시 또는 무부하시 변전소 급전측의 전압보다 말단측의 전압이 높아져 심각할 경우 절연파괴 및 기기에 과전압으로 인한 문제가 발생할 수 있다. 최근 도입된 고속철도 구간에서 무부하시 또는 경부하시 전압이 상승되는 현상이 발생하여 실측 및 시뮬레이션을 통하여 전위 상승에 대한 원인을 검토하고자 한다.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.299-304
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• 2008

Catenary and Pantograph are a power supply devices for electric trains and shall be steadily contacted. Rail catenary must be installed precisely and managed for stable train operations. But external factors such as weathers, nature, etc., or aging affect catenary geometry. Changed catenary height causes high voltage spark or instant electric disconnection. Big spark and disconnection damage pantograph shoe and catenary coating and might interrupt rail operations. To prevent a big scale spark or electric disconnection catenary maintenance shall be required with catenary geometry measurement systems. In this paper, we describe the development of catenary height and stagger measurement system. The catenary height and stagger measurement system uses Acuity company's AR4000 Range Finder for distance measurement and AccuRange Line Scanner for degree measurement. This system reports suspicious overhead line sections with excessive height and stagger variance.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.900-904
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• 2009

The measurement of contact wire uplift in electric railway is one of the most test method to accept the maximum permitted speed of new vehicles or pantographs. The contact wire uplift can be measured for shot periods when pantograph is running in monitoring station. This paper describes the development of two different methods for contact uplift measurement using vision-based system and wireless online monitoring system. Our vision-based system employs a high-speed CMOS (Complementary Metal Oxide Semiconductor) camera with gigabit ethernet LAN. The development of a real-time remote monitoring system that acquires data from any kind of sensor to be transmitted by wireless communication from overhead line and structure at 25 kV to a computer in catenary system. The proposed two kind of different measurement systems to evaluation for dynamic uplift of overhead contact wire shows promising on-field applications for high speed train such as Korea Tilting Train (TTX) and Korea Train eXpress (KTX).

• The Transactions of The Korean Institute of Electrical Engineers
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• v.62 no.6
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• pp.886-890
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• 2013

Uplift of contact wire and dynamic characteristics between pantograph and contact wire are key interaction performance of OCS (Overhead Catenary System). These two evaluation items are the approval criteria for the performance between OCS and pantograph. A telemetry system or DAQ (Data Acquisition) System based on wireless communication make it monitor a dynamic behavior which is measured directly in a 25 kv like parts. While permissible working time is too short time to install is too long. In this paper, it is described that optimization the telemetry measurement system for OCS and increasing accuracy, easy adaptation, and faster handling can be also achieved through the study.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1377-1380
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• 2000

본 논문은 산업자원부 중기거점기술개발사업의 일환인 '전동차 추진장치 기술 개발 과제'로 개발된 전동차 구동 시스템에 대하여 서술하고 있다. 개발된 전동차 구동 시스템은 4대의 210kW 유도전동기를 병렬로 구동하며 주 전력 소자로 IGBT(Insulated Gate Bipolar Transisotr)를 사용하여 스너버 회로가 없는 간단하고 신뢰성 있는 시스템을 구현하였다. 제어 기법으로는 벡터 제어 기법을 적용하여 저속 기동 및 가속시의 토오크 제어 특성을 향상시켰다. 본 논문에서는 전체시스템의 구성 및 특성을 약술하고, 적용된 벡터제어에 대하여 논하였다. 그리고 본 과제를 위해 새로 제작된 전동차 1편성을 이용하여 한국철도차량주식회사 상주공장의 시험 전차선에서 주행 시험을 실시한 결과 개발된 전동차 구동 시스템의 성능이 목표 사양을 만족함을 확인하였다.