• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
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• pp.549-550
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• 2006

• 전기학회논문지
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• 제59권9호
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• pp.1638-1643
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• 2010

HVDC is better economic method than HVAC in case of long distance transmission and it is possible to interconnect transmission lines regardless of difference of power frequency. The electrical environment problems of HVDC overhead transmission line are electric field, charged voltage, ion current and so on. For biopolar HVDC lines, most of the ions are directed toward the opposite polarity conductor, but a significant fraction is also directed toward the ground. These problems are major factor to design configuration of HVDC overhead transmission line. Therefore, It is necessary to test an environmental characteristics of HVDC overhead transmission line. In this paper, to assess the ion characteristic of HVDC transmission line, continuous measurements have been done on the biopolar single circuit line with ACSR 480mm2-6 bundle conductors of Gochang HVDC Test line. And then the ion characteristics were analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부A
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• pp.245-247
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• 1998

Compacting of Overhead power transmission lines can be helpful in solving many problems, such as reduction of land and forest losses. decrease of the line's environmental impact zones, improvement of its electrical performance. And in overhead transmission lines, regular polygon configuration of bundled conductors are considered and adopted. This papers are compared to subconductor surface charges and electric field gradients, line parameters, natural capacities for regular polygon and modified configurations in 345kV 4 bundle 2 circuits horizontal type transmission lines.

• 한국전기전자재료학회논문지
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• 제20권11호
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• pp.1004-1008
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• 2007

The ice coats are built on 25 kV overhead contact wire when the temperature is lower than $0^{\circ}C$. It generates shockwaves at the mechanical interface of the collecting strips of the pantograph and the contact wire. The de-icing processes should be performed to avoid shockwaves which are generated by a pulsed high-voltage arc discharge. This paper presents temperature analysis of the de-icing effects which could be applied to the overhead contact wire of railways using Joule heat. The results show that 350 A is the proper current for $0^{\circ}C$ conductor according to environmental condition such as velocity of air stream, ambient temperature and moisture.

• Journal of Information Processing Systems
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• 제13권5호
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• pp.1358-1371
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• 2017

Dynamic thermal rating (DTR) system is an effective method to improve the capacity of existing overhead line. According to the methodology based on CIGRE (International Council on Large Electric systems) standard, ampacity values under steady-state heating balance can be calculated from ambient environmental conditions. In this study, simulation analysis of relations between parameters and ampacity is described as functional dependence, which can provide an effective basis for the design and research of overhead transmission lines. The simulation of ampacity variation in different rating scales is described in this paper, which are determined from real-time meteorological data and conductor state parameters. To test the performance of DTR in different rating scales, capacity improvement and risk level are presented. And the experimental results show that the capacity of transmission line by using DTR has significant improvement, with low probability of risk. The information of this study has an important reference value to the operation management of power grid.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 춘계학술대회 논문집
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• pp.369-373
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• 2008

이번 사례는 154kV 변전소 OO송전선로(T/L)인 출입철탑(철주 포함) 설계 시 설치장소의 협소한 문제점을 해결하기 위한 대책을 수립하고 이에 대하여 시공과정에서 발생한 문제점 과 이를 개선한 사례를 분석하였다. 표준형 철탑으로 설계 시 인 출입에 따른 전로의 전기적인 이격거리를 확보하기가 어려우며, 이를 개선하기 위해 특수형상의 철탑 및 기초형식의 인입방안 설계에 대한 개선대책과 현장 개선 사례 분석을 통하여 향후 인입 전선로 설계검토에 참고자료가 될 것으로 사료된다.

• Structural Engineering and Mechanics
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• 제78권1호
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• pp.87-102
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• 2021

Long span cross-rope suspension structure is an innovative structural system evolved from typical Cross-Rope Suspension (CRS) guyed tower, a type of supporting system with short span suspension cable supporting overhead power transmission lines. In mountainous areas, the span length of suspension cable was designed to be extended to hundreds or over one thousand meters, which is applicable for crossing deep valleys. Vortex Induced Vibration (VIV) of overhead power transmission lines was considered to be one of the major factors of its fatigue and service life. In this paper, VIV and its controlling by Stockbridge damper for long span CRS was discussed. Firstly, energy balance method and finite element method for assessing VIV of CRS were presented. An approach of establishing FE model of long span CRS structure with dampers was introduced. The effect of Stockbridge damper for overall vibration of CRS was compared in both theoretical and numerical approaches. Results indicated that vibration characteristics of conductor in long span CRS compared with traditional tower-line system. Secondly, analysis on long span CRS including Stockbridge damper showed additional dampers installed were essential for controlling maximum dynamic bending stresses of conductors at both ends. Moreover, factors, including configuration and mass of Stockbridge damper, span length of suspension cable and conductor and number of spans of conductor, were assessed for further discussion on VIV controlling of long span CRS.

• 한국전자파학회논문지
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• 제29권7호
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• pp.566-569
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• 2018

철도 전차선 구조에 고주파 전력을 인가할 수 있는 전력선 커플러에 대해 분석하였다. 전차선 구조는 고압의 환경에서 보조전원을 공급하기가 어렵고, 먼 거리까지 전력을 전달하는 방법이 필요하다. 이를 위해 코어를 사용하지 않는 로고스키 코일에 공진을 활용하는 방법을 제안하였다. 조가선, 전차선, 드로퍼로 구성된 간이 전차선 구조를 제작하였고, 여러 사이즈의 커플러를 제작하여 조가선에 연결한 다음 일정 거리만큼 떨어진 두 커플러의 전달 특성을 비교하였다. 가장 성능이 좋은 커플러에 매칭 회로를 적용하여 측정한 결과, 2.5 m 거리에서 53 %의 전달 효율을 나타내었다. 제안하는 방법은 전차선과 같은 특수한 구조물에서 기존의 도선을 활용하여 보조전원을 인가할 수 있음을 보여준다.

• 한국산업융합학회 논문집
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• 제26권5호
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• pp.915-923
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• 2023

As environmental regulations on carbon emissions are strengthened worldwide, the existing internal combustion engine-centered automobile industry is being reformed. In particular, large buses and large cargo trucks are pointed out as one of the main causes of environmental destruction due to excessive carbon emissions. The E-Highway power collection system, which has recently been proposed as a solution, uses the vehicle's battery as a backup power source or regenerative braking, depending on whether the pan head of the pentograph installed in the vehicle is in contact with the overhead line. It is used to store the excess energy generated. However, wear through contact due to continuous contact reduces the current collection effect and causes failure. In this paper, by using the current difference, the horizontal position information of the panhead in contact with the overhead line is acquired, thereby reducing the abrasion of the conductor and the panhead Make it possible to follow the overhead line. The position estimation method proposed in this paper simply configures a device that can detect the position of the overhead line of the pantograph by the difference in resistance. It is economical and has the advantage of reducing the volume. The characteristics of the pantograph estimating the location of overhead lines were analyzed using the difference between the two currents of the current collector, the feasibility of the positioning estimation system was verified through simulations and experiments.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1209-1210
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• 2008

According to previous report, aged sleeves for old transmission lines have variable defects such as biased installed case or corrosion of steel sleeve. Biased installed sleeve occupied 20 percent among the investigated aged sleeves. This defect must cause local heating of splice connector and limit power transmission capacity. It even inspire falling out of overhead conductor from sleeves. This paper studies thermal properties and tension for ACSR conductor in case of biased installed sleeve model. The detailed results were presented in the text.