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카테나리 전차선로 현수애자의 환경부식에 따른 안전성 연구
이재봉(Jae-Bong Lee),소선영(Sun-Young So) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Suspension insulator in Catenary Trolley Wire Systems must have two characteristics, electric insulation and mechanical endurance. Because suspension insulator is used in supporting and insulating position between power supply parts and earth conducted supporting parts. The insulator"s electric characteristics can be influenced by surface pollution and damage from the environment such as humidity, dust, smoke, salt. etc. And, the insulating parts can be electrically short. These electrically damaged insulator can cause serious accidents that have far-reaching effect. So appropriate management basis of suspension insulator is needed. And we present appropriate cleaning and the changing period of suspension insulator on the basis of actual data.
이태식(Lee Tai Sik),박은수(Park Eun Soo),구자경(Koo Ja Kyung),소선영(So Sun Young),김정기(Kim Jung Gi) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The subway is evaluated as a mean of public transportaiton, well differenct from other transportation means, the construction expense is increasing gradually with enormous problems. This research analyzes the problems which occur at the planning and design process for subway construction. The demand forecast which is obtained from planning and design process will improve construction plans and size of subway system. The plan which makes the transportation means more useful, reduces the budget.
이국명(Lee Kuk-Myoung),김병현(Kim Byung-Hyun),소선영(So Sun-Young),김학련(Kim Hak-Lyun) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Grounding fault and short of the DC power supply systems are detected and protected by high-speed circuit breaker, linked breaking device, ground relay and fault selective device, all of which are installed and operated in substaions. however, there have been many cases in which the protective devices did not detect grounding of of the over head catenary systems on concrete support for an extended period of time. Such cases often cause severe damages to the supports with high grounding resistances. If grounding accidents occur repetitively, the earth current and the rise of earth potential can damage not only passenger and staff but also electric facilities and equipment, necessitating high cost and endeavor to restore. The following study points out various problems that can be occurred occur as a result of high impedance grounding accident, and proposes a new system which can protect and intercept them.
이재봉(Jae-Bong Lee),장우진(Woo-Jean Jang),조용현(Yong-Hyeon Cho),이기원(Ki-Won Lee),소선영(Sun-Young So),박종학(Jong-Hak Park) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
There are 5 railway bridges in a Seoul metro network; Jamsil, Dangsan(line 2), Dongho(line 3), Dongjak(line 4) and Chungdam(line 7). Because there are strong wind and vibration in the bridges, uplift of a contact wire caused by pantographs in the bridge section is higher than in a normal section. If the uplift at the support point exceed 10 ㎝, an interference between pantographs and catenary system happens. Estimated maximum uplift is obtained by applying safety factor 2 to the simulation results. The application of the safety factor is needed for taking into account of the effect of the wind, etc. Previously, we can not check whether or not the safety factor is proper. Recently, we can measure the uplift during the train operation, as a telemetry system which can measure dynamic behavior of the contact wire has been developed. The aim of this research is to review how proper the safety factor related to the uplift is, based on the measurement. We performed simulations and experiments for the uplift at the Jamsil railway bridge. The simulations were performed for the every kind of the train passing the Jamsil bridge. In order to compare the analysis results with the measurement results, we measured the uplifts at the support when the trains passed the measuring point. Finally, we proposed adequate safety factor with the uplift for the bridge section.