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고병훈(Byeonghun Ko),박영(Young Park),권삼영(Samyoung Kwon),정호성(Hosung Jung),박현준(Hyun-June Park),김창희(Changhee Kim) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
This paper describes the various wavelengths of electrical arc on overhead contact line for improvement of the current collection performance. The tests are performed with the arc measuring device and a welding machine to generate electrical arc artificially. The experimental result shows the electrical arc on overhead contact line and pantograph could be analyzed by artificial discharge
고병훈(Byeonghun Ko),박현준(Hyun-June Park),권삼영(Sam-Young Kwon),나해경(Hae Kyung Na),이형우(Hyung-Woo Lee) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
With the development of high speed railway, traction motors play a critical role in the operation of railway vehicle. This paper describes the use of 1000 pF coupler as a on-line partial discharge (PD) measurement for the assessment of railway traction motor. The PD tests are performed with developed PD analyzer and the 5 model coils such as thermal, electrical, mechanical and environmental aging respectively at various AC voltages. On-line PD tests using 1000 pF couplers show that PD patterns can be detected successfully at 2.3 kV.
A New Concept of Power Flow Analysis
Hyungchul Kim,Nader Samann,Donggeun Shin,Byeonghun Ko,Gilsoo Jang,Junmin Cha 대한전기학회 2007 Journal of Electrical Engineering & Technology Vol.2 No.3
The solution of the power flow is one of the most important problems in electrical power systems. These traditional methods such as Gauss-Seidel method and Newton-Raphson (NR) method have had drawbacks up to now such as initial values, abnormal operating solutions and divergences in heavy loads. In order to overcome theses problems, the power flow solution incorporating genetic algorithm (GA) is introduced in this paper. General operator of genetic algorithm, arithmetic crossover, and non-uniform mutation operator of GA are suggested to solve the power flow problem. While abnormal solution cannot be obtained by a NR method, multiple power flow solution can be obtained by a GA method. With a heavy load, both normal solution and abnormal solution can be obtained by a proposed method. In this paper, a floating number representation instead of the binary number representation is introduced for accuracy. Simulation results have been compared with traditional methods.