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전기철도 전차선로 지지애자의 염해지역 열화특성 사례 연구
정호성,박영,Jung, Hosung,Park, Young 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.4
In the Airport Railroad, the Yeongjong Bridge has a length of 4,420 m and connects Yeongjong Island with the mainland of Incheon City. The bridge is a two-level structure, consisting of a six-lane road at the upper level and a combination of a road and railroad at the lower level. The environmental conditions for the electric railway come mainly from the salt injury area and a heavy industry zone, and the maintenance cycles are determined differently depending on these conditions. This study analyzed the deterioration characteristics of long rod insulators produced with a movable ceramic bracket and polymer materials in the Yeongjong Bridge section of the Airport Railway operating in the salt injury area according to the material characteristics. Comparison of the corona measurements when the insulators were cleaned at the same time showed that the polymer insulator had a higher insulation performance than the ceramic insulator.
타선흡상현상을 고려한 교류철도 급전계통 고장점 표정기법
정호성(Hosung Jung),김주욱(Joo-Uk Kim),김형철(Hyungchul Kim),민명환(Myung-Hwan Min),안태풍(Tae-Pung An) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
This paper presents an improved fault location estimation algorithm to reduce the fault location estimation error ratio in AT boosting current ratio technique. The domestic AC traction system uses the AT feeding system as a standard, and most of the lines are composed of double tracks(up and down lines). It was confirmed that the fault location estimation error is increased due to the change of the AT boosting current of the faulted line due to the other line’s AT boosting current characteristics. Therefore, in this paper, an improved fault location estimation algorithm is proposed by using all AT boosting currents considering of the other line’s boosting current characteristics. In order to evaluate the proposed algorithm performance, the AC railway power supply system is modeled and various fault simulations were performed using the power analysis program. As a result, when comparing the error of the existing technique and the improved technique, the improved algorithm shows an average error of 0.16%, and even the maximum error is 0.88%, which is satisfied within 2% of the domestic standard.
고무차륜시스템에서의 지락보호를 위한 급전선로 절연과 부극전위와의 영향 분석
정호성(Hosung Jung),신승권(Seongkuen Shin),김형철(Hyungchul Kim),박영(Young Park),조상훈(Sanghoon Cho) 대한전기학회 2013 전기학회논문지 Vol.62 No.4
We have analyzed influence of potential rise in negative bus, which caused by decrease of power feeding line insulation, upon protecting method of DC ground protection device which detecting potential rise between negative bus and ground in order to detect ground fault in the rubber wheel system. For this purpose, we proposed negative potential equation between negative bus and ground and calculated negative potential according to system condition changes by estimating power feeding line insulation changes in steel wheel system and rubber wheel system, and equalizing DC power feeding system when ground fault occurred. Also, in order to estimate negative potential of real system, we modeled the rubber wheel system, and simulated normal status, grounding fault occurrence and power feeding line insulation changes. In normal status, negative potential did not rise significantly regardless of vehicle operation. When ground fault occurred, negative potential rose up over 300V regardless of fault resistance. However, we also observed that negative potential rose when power feeding line insulation dropped down under 1MΩ. In conclusion, our result shows that in case of rubber wheel system unlike steel wheel system, relay will be prevented maloperation and insulation status observation can be ensured when ground over voltage relay will be set 200V ~ 300V.
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.