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김귀동(Kim Kwi-Dong),창상훈(Chang Sang-Hoon),한문섭(Han Moon-Sub),김왕곤(Kim Wang-Gon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
The harmonics in railway high voltage system is due to common use of 3 phase incoming bus and doing the power converter for traction system on the electric car(or electric locomotive). This paper, we analyze the harmonics mechanism and characteristics of railway high voltage system, also we analyze the problem according to the actual measurement about influence of harmonics on the railway high voltage system. And we proved the countermeasure device(passive filter or L-C filter) of harmonics applies in the field. The test result, we have know that the filter is not fit. Consequently, The countermeasure of harmonics for the railway high voltage system be able to resolve by another filter.
김영선(Kim Young-Sun),창상훈(Chang Sang-Hoon),김왕곤(Kim Wang-Gon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
High quality power supplying of power distribution system in electric railway system is the important function. Power feeding system is complicated witch is compose with distribution line, circuit break, protection facilities and so on. Among this components, role of substation is most important for elevation of reliability in electric power system. Therefore, the enhanced reliability considering the preventive inspection, repair work, replacement is necessary. In this study, a proposed the enhanced reliability method through a calculation of fault probability in power feeding system.
임금광(Yim Geum-Kwang),창상훈(Chang Sang-Hoon),김왕곤(Kim Wang-Gon) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Railroad, a superior mode of public transportation provides safe, efficient, speedy, comfortable and economical service, has fundamentally different characteristics from airplanes, ships and cars. Among the unique characteristics of a railroad is the fact that it operates on fixed track with multiple car trains. The subway system was first selected as the best solution to difficult automobile traffic conditions and environmental problems. Seoul subway no.1 line (Jongno line) was opened for service on August 15, 1974. Seoul city has completed and now operates eight subway lines (286.7㎞) since 1974. At present the subways operate in Busan, Daegu and Incheon city, and are under construction in Gwangju and Daejeon city. The power source for subway trains has been electricity since 1896, and power supply systems are the third rail type and/or the catenary system. The typical catenary system is the rigid bar type. R-bar and T-bar are used in the rigid bar type of catenary system, and the two types of R-bar and T-bar are uesd in Korea also. R-bar is used only for AC 25㎸ power supply and T-bar for DC 1,500V. From 30 years of subway experience I would like to suggest the most economic catenary system to ensure of safety, reliability and expediency for the railway lines to be constructed and the forthcoming replacement due to the life cycle after studying and analysing the characteristics, advantages and disadvantages of R-bar and T-bar.
전기철도 전력 원방 감시제어 시스템 최적 구성방안 연구
변재영(Byun Jae-Young),창상훈(Chang Sang-Hoon),김왕곤(Kim wang-Gon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is countermeasure against the problem point it will be able to occur with infiltration of the hardware and software. And, we proposed the optimum integrated of system construction plan for the SCADA system fuction set and a system design.
조웅기(Cho Woong-Ki),창상훈(Chang Sang-Hoon),한성호(Han Seong-Ho),김왕곤(Kim Wang-Gon) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
In case the fault occurs in railway high voltage power supply network, protective relaying system must selectively detect 1 wire ground fault of grounding or non-grounding system. And this study presents railway high voltage power supply system model using PSCAD/EMTDC Ver 3.08 for circuit analysis and fault studies. In this paper, we propose protection method of non-grounding system of railway high voltage power supply system. The result shows its usefulness.
金旺坤,黃敎榮,崔相俊 서울産業大學校 1990 논문집 Vol.31 No.1
본 연구는 電力系統의 力率을 직독형으로 測定하기 위한 Transduser의 회로를 開發하기 위하여 株式會社 千一電機와 Maching Fund로 이루어진 硏究이다. 赤外線 Optocoupler의 電氣的 絶緣特性과 信號傳達 特性을 이용하여 전력선의 電壓과 電流의 位相差를 電氣的으로 絶緣하면서 位相信號를 檢出하여 puls를 변조한 다음 cosθ값으로 變換하여 pulse counter를 사용하여 Digital 신호를 4Bit 7 sigment의 표시기에 力率값을 나타내주며 또한 이 力率값을 A/D 變換器회로를 사용하여 Anlog 신호를 出力하므로 力率개선용 機器의 制御나 力率記錄計등을 접속할 수 있도록 연구되었다. 또한 본 연구를 하는 과정에서 相差計(θ) 및 無效力率(sinθ)計도 같은 原理로 동작될 수 있기 때문에 이 회로에 약간의 變形을 가하면 3가지를 選擇測定이 가능한 計測器가 開發이 가능하다. This study on the development of transducer circuit which measures powerfactor of a power system in direct reading mode is accomplished by the matching funds system performed by Chunil Electric Enterprise and this study group. This algorithm of the technic of a power factor measurement is as follows. First, pulse modulation of the current phase signal detect with the difference of the phase angle to voltage and current in use of the characteristics which are electrical insulation and signal transmission of a infrared optocoupler. Second, this signals are converted into Cosineθand then this values are converted into digital signal by the pulse counter. Third, the signals are flowed into digitizer with 4 digits 7 segments. Last, the analog signals of the power factor are used to run electrical machinery, instrument and recorder. This study enables us to develop other two measurement factors-reactive power factor and angle meter. Namely, we are able to develop new digital meter that can display the power angle, power factor and reactive power factor.