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정호성(Hosung Jung),김주욱(Joouk Kim),김형철(Hyungchul Kim),조신제(Shinje Cho) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.5
In this paper, we propose a catenary heating measurement system using small-scaled DC power supply for the configuration of a DC de-icing system and measure the current distribution ratio and heating value of contact wire and messenger wire. As a result, the measurement showed similar temperature increases in comparison with theoretical formulas, and it is believed that relatively accurate predictions will be possible for future melting temperature estimations through theoretical formulas.
전차선로 해빙시스템을 위한 발열시험을 통한 전차선 온도상승 특성평가
정호성(Hosung Jung),김주욱(Joouk Kim),김형철(Hyungchul Kim) 대한전기학회 2021 전기학회논문지 Vol.70 No.9
This paper analyzes the temperature rising characteristics of the deicing catenary system in winter. For the composition of the deicing system, the deicing system is constructed according to the combination of various trolley wires and messenger wires applied at Korea. To compare of temperature rising characteristics, the current distribution ratio between trolley wire and messenger wire are measured and the wire temperature is measured according to the deicing current using a catenary heating test device. In case of current distribution ratio test, the current distribution ratio is measured in 82.1%: 18.9% similar to the theoretical ratio in DC supplying. As a result of temperature rising test, the temperature of Cu 150 ㎟ is increased by 1.26 °C/m at a wind speed of 0.5 m/s and 0.92 °C/m at 2.0 m/s when supplying DC 350 A, And in case of Bz 65 ㎟, when DC 95 A is supplied, the temperature rose at 0.74° C/m at 0.5 m/s, and 0.56 °C/m at 2.0 m/s. In the comparison between the theoretical equation and test result, the difference is at most 0.7 ℃. Therefore, it is confirmed that it would be appropriate to use the theoretical equation in the design of the deicing system.
도시철도 직류 비접지 급전계통에서의 선택 지락보호시스템의 성능평가
정호성(Hosung Jung),김주욱(Joouk Kim),신승권(Seongkuen, Shin),김형철(Hyungchul Kim),안태풍(Taepung An),윤준석(Junseok Yun) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
This paper presents to verify the selective grounding fault protective relaying technique for the ungrounded DC traction power supply system. This system selectively blocks fault section when grounding fault occurred. In order to perform this verification, field test facilities have been installed on Oesam substation and Worldcup-Stadium substation, and field test process has been suggested. Also, selective grounding fault protective relaying components and rail voltage reduction device have been tested with the various trial examinations. In order to compare and evaluate performance of the selective grounding fault protective relaying function, field test system was modeled and the system fault simulation results were compared and evaluated with the field test result. Performance of selective grounding fault protective relaying function was evaluated with the above-mentioned process, and the fact that the system recognizes fault section irrespective of insulation between rail and ground and fault resistance from grounding fault.