• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 특별세미나 특별세션
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• pp.209-218
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• 2006

This paper presents the comparison and analysis of the power supply system of a Maglev train and conventional electric railway. Even though all Maglev trains have batteries on their vehicles, electric power supply from the ground side is necessary for levitation, propulsion, on-board electrical equipment, battery recharging, and so on. At low speeds up to $100{\sim}150(km/h)$, the Maglev train, generally, uses a mechanical contact, a current collector as same as conventional electric railway. However, at high speeds, the Maglev train can no longer obtain power from the ground side by using a mechanical contact. Therefore, high speed Maglev trains use their own way to deliver the power to the vehicle from the ground. In this paper, the power supply systems of the german, japanese, and korean low- and high-speed Maglev trains have been reviewed.

• 전기학회논문지
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• 제64권5호
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• pp.812-816
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• 2015

Recently, various monitoring systems have been proposed to detect interaction performance between trains and infrastructure, as well as, various techniques to improve the accuracy and performance of such inspection equipment in high speeds. Especially, it is important to predict electric noise of high speed trains due to its effect on detection system accuracy. In this paper, we analyze various types of electrical noise in electric vehicles to improve the accuracy of the detection module of the inspection car. In detail, analysis of electric noise of high speed railway is performed as a function of speed based on field tests that were carried out by HEMU-430X (Highspeed Eletric Multiple Unit - 430 km/h eXperiment).

• 조명전기설비학회논문지
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• 제20권7호
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• pp.29-37
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• 2006

고속철도는 동기 전동기를 제어하기 위한 컨버터 및 인버터를 포함한 많은 비선형 부하를 가지고 있다. 이들 비선형 부하에 의한 고조파는 크기가 클 뿐만 아니라 시간에 따라 변하는 특성을 나타내었다. 부하 용량이 매우 크기 때문에 전력회사에 미치는 영향이 클 뿐만 아니라 이웃 수용가의 전력시스템에 주는 영향 또한 고려되어야 한다. 본 논문에서는 시간에 따라 변하는 고조파를 측정하고 국제 기준인 IEEE 519와 IEC 61000-3-6에 의해 누적확률을 사용하여 평가하였다.

• 조명전기설비학회논문지
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• 제21권2호
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• pp.71-77
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• 2007

고속열차는 전력계통에 전압 변통을 일으키며 시간에 따라 변하는 비선형 부하이다. 시간에 따라 변하는 부하를 해결하기 위해 쓰이는 가장 보편적인 방법은 누적확률을 사용하는 것이다. 플리커는 전압 변동의 크기에 따라 램프의 방출 변화에 의한 인간의 지각 효과로 정의된다. 본 논문에서는 고속열차 부하의 고조파 및 플리커 측정을 심도있게 분석한다. 그리고 측정 결과는 국제 기준인 IEC 61000-3-6과 IEC 61000-3-7에 의해 평가하고자 한다.

• 조명전기설비학회논문지
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• 제18권4호
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• pp.138-143
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• 2004

본 논문은 고속전철 차량에서부터 변전소까지의 고조파에 대해서 분석하였으며, 수동필터를 이용한 고조파 저감 방법을 제시한다. 고속전철 변전소가 공급하는 열차구간에 있어서 운행 열차의 수에 따라 고조파의 파급 특성을 살펴보았다. 고조파는 변압기 과열과 통신유도장해 등 문제를 일으킬 수 있다. 이러한 고조파에 의한 손상을 줄이기 위하여 본 논문은 고조파 저감방법을 제시하였다. 제안된 방법은 PSCAD/EMTDC 시뮬레이션에 의해 증명되었다.

• 한국소음진동공학회논문집
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• 제18권10호
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• pp.1014-1023
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• 2008

Subway electric trains need to be faster for accommodation of long distance passengers. The faster run of the existing trains results in deterioration of ride quality due to noise and vibration. To reduce the noise and vibration of the electric train, a running test of the electric train was performed and an ADAMS/Rail model was set up to verify the running test results. The experimental results show that the sources of the cabin noise and vibration basically comes from the irregularity of the railroad track and the deterioration of the connection part between cabin and bogie. Consequently for mitigation of noise and vibration of the electric train, the redesign of the center pivot with softer stiffness and the minimization of rail irregularity are necessary. the frequent maintenance of the train will lead to better comport.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.2224-2229
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• 2008

High-Speed train has been developed and it becomes faster and environmental friendly. As trains run faster, Noise of trains is generated mainly by aerodynamic disturbance. Pantograph, both ends of trains, and gaps of coaches which are thought to be aerodynamic noise's factors are primarily studied. Pantograph is a similarly shaped metal framework on the roof of an electric high speed train, transmitting current from an overhead electric catenary wire. Panhead which contacts electric wires directly looks like a bluff strut, goes through flows, is sensitive to external disturbances and is one of the most important factors which decide whole vehicles' driving ability. In this study, aerodynamically robust optimized pantograph panhead shape is designed and then evaluated through subsonic wind tunnel test. To compare these with existing panhead rectangular shapes or circular cylinder shapes, By visualizing strong vortex flow patterns which are main noise sources, characteristics are compared and analyzed

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1333-1337
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• 2003

The present headway on KNR lines varies from 6 to 10 minutes. Therefore, KNR would like to reduce the headway of all the lines by 4 minutes with the implementation of ERTMS/ETCS on-board system. In Korea, thanks to the operation of the High Speed Line in 2004, the bottleneck phenomenon will occur only in a few sections such as Seoul-Siheung, which will be the common route between KTX and conventional trains. Therefore, we will analyze expected braking distance and running time depending on characteristics of conventional passenger and freight trains and high speed train will be operated within electrified conventional line for comparing the headways of ATS trackside and ETRMS/ETCS on-board system within the Seoul-Siheung section.

• 한국전기전자재료학회논문지
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• 제22권10호
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• pp.864-869
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• 2009

The measurement of contact wire uplift in electric railways is one of the most important test parameters to accepting the maximum permitted speed of new electric vehicles and pantographs. The contact wire uplift can be measured over short periods when the pantograph passes monitoring stations. In this paper, a high-speed image measurement system and its image processing method are being developed to evaluate dynamic uplift of overhead contact wires caused by pantograph contact forces of Korea Tilting Train eXpress (TTX) and Korea Train eXpress (KTX). The image measurement system was implemented utilizing a high-speed CMOS (Complementary Metal Oxide Semiconductor) camera and gigabit ethernet LAN. Unlike previous systems, the uplift measurement system using high speed camera is installed on the side of the rail, making maintenance convenient. On-field verification of the uplift measurement system for overhead contact wire using high speed camera was conducted by measuring uplift of the TTX followed by operation speeds at the Honam conventional line and high-speed railway line. The proposed high-speed image measurement system to evaluate dynamic uplift of overhead contact wires shows promising on-field applications for high speed trains such as KTX and TTX.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.261-261
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• 2010

In electric railways, high speed trains are normally supplied by AC 25kV power by contact between a pantograph contact strip and a contact wire. Advanced railway operating countries are actively researching various areas for the development of contact strips due to the reason that the properties of contact strips are one of the key factors of electric railways. This paper applied nano technology which is rapidly growing in many areas to the contact strip of a pantograph for current collection performance improvement considering speed up of electric railways. In detail, this paper proposes a method to dope nano particles of metal to a Korea Train eXpress(KTX) carbon pantograph and its measurement results. It is expected that the contents of this paper be used for preliminary study of high-speed railway current collection technologies.