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지중 2회선 154 kV 송전케이블의 정상 및 지락고장에 따른 전자기력 분포에 관한 연구
김희민,김소영,임상현,박관수,Kim, Hui Min,Kim, So Young,Im, Sang Hyeon,Park, Gwan Soo 한국전력공사 2015 KEPCO Journal on electric power and energy Vol.1 No.1
The goal of this study is the size and distribution of the electromagnetic force generated by the current flowing through the second underground line of 154kV power transmission cables by using electromagnetic finite element analysis. So we interpret how mutually electromagnetic force has an effect on the comparable judgement of Trefoil, Duct and Flat, which shows in a numerical arrangement. 154kV OF 1200SQ Cable 1.281km not only is applicable to modeling for underground transmission cable but also examine the effect of line to line, phase to phase and size and direction of the electromagnetic force preparing for the occurrence of normal state and single-phase earth fault, which are arranged in trefoil, duct and flat formation between sections. As showing how the trajectory, and size distribution of the electromagnetic force translate as the arrangement of the cables when a steady-state current and a fault current flows on the underground cables, I hope that when Underground transmission is designed, this data will be useful information.
다중 권선형 솔레노이드 코일에 작용하는 전자기적 팽창력 해석
김희민(Hui Min Kim),이용규(Yong Kyu Lee),송명근(Meung Geun Song) 한국자기학회 2020 韓國磁氣學會誌 Vol.30 No.6
The solenoid coil is one of the most important design component for efficient electrical energy conversion in the structure of electric machines such as motors, generators, and transformers. When the current is applied to a multi-turn solenoid coil, a uniform magnetic field which is proportional to the number of coil windings is generated inside the coil, and the high-density magnetic field generated by the coil can be converted into mechanical kinetic energy by applying the strong electromagnetic force to a ferromagnetic object. However, the interaction between the current and magnetic field of the solenoid coil generates a strong electromagnetic force between each coil wire. In this paper, when the current flows in the multi-turn solenoid coil, the analysis method and numerical equation for calculating the electromagnetic expansion force generated in the radial direction of a multi-turn solenoid coil are proposed. Calculated results are verified by simulated ones.
자기누설 비파괴 검사 시스템에서 축방향 미소결함 측정에 관한 연구
김희민(Hui Min Kim),박관수(Gwan Soo Park),노용우(Yong Woo Rho),유휘룡(Hui Ryong Yoo),조성호(Sung Ho Cho),김동규(Dong Kyu Kim),구성자(Sung Ja Koo) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.2
From among the NDT (Non-Destructive Testing) methods, the MFL (Magnetic Flux Leakage) PIG (Pipeline Inspection Gauge) is especially suitable for testing pipelines because the pipeline has high magnetic permeability. MFL PIG showed high performance in detecting the metal loss and corrosions. However, MFL PIG is difficult to detect the crack which occured by exterior-interior pressure difference in pipelines and the shape of crack is very long and narrow. Therefore, the new PIG is needed to be researched and developed for detecting the cracks. The CMFL (Circumferential MF) PIG performs magnetic fields circumferentially and can maximize the magnetic flux leakage at the cracks. In this paper, CMFL PIG is designed and the distribution of the magnetic fields is analyzed by using 3 dimensional nonlinear finite element method (FEM). By Simulating and Measuring the magnetic leakage field, it is possible to detect of axial cracks in the pipeline.
배관용 자기누설 비파괴 검사에서 축방향 미소결함의 형상 판정에 관한 연구
김희민(Hui Min Kim),박관수(Gwan Soo Park) 한국자기학회 2013 韓國磁氣學會誌 Vol.23 No.1
MFL PIG (Magnetic Flux Leakage Pipeline Inspection Gauge) is called the system which detects the defect for underground pipelines by using magnetic flux leakage method in nondestructive testing. This method is very suitable for testing pipelines because pipeline has high magnetic permeability. MFL PIG generates the magnetic fields to the pipe axially oriented, and detect the signal of leakage flux by using hall sensor. However, MFL PIG is hard to detect the axially oriented crack with small size because the magnetic flux leakage is not enough to be occurred. To detect the small size and axially oriented crack, the circumferential MFL (CMFL) PIG is being proposed and it can maximize the leakage flux for the axial crack by performing magnetic fields circumferentially on the pipe. In this paper, CMFL PIG is applied to detect the axially oriented crack with small size and the analysis for the distribution and the amplitude of the leakage flux signal is performed by using three dimensional finite element method. From sensing signals, the method how to determine the shape of axially oriented cracks is proposed and verified with experiment.
에너지 변환식을 이용한 Multi-Layer Solenoid 코일의 전자기적 팽창력 계산
김희민(Hui Min Kim),이용규(Yong Kyu Lee),송명근(Meung Geun Song) 한국자기학회 2021 韓國磁氣學會誌 Vol.31 No.5
The multi-layer solenoid coil is one of the most important design component for efficient electro-mechanical energy conversion in electrical machines such as generators, motors and transformers. When the voltage and current are applied across the coil, a uniform magnetic field is generated inside the coil and that is proportional to the number of coil windings, and the high-density magnetic field generated by the coil can be converted to mechanical energy by applying the strong electromagnetic force to a ferromagnetic material. At this time, the interaction between the current and magnetic field of the solenoid coil generates a strong electromagnetic expansive force between each coil wire. In this paper, we proposed both the method and formula to calculate the electromagnetic expansion force acting on the multi-winding layer solenoid coil by using the energy transfer equation. When the current flows a solenoid coil, the expansion force is generated in the radial direction of the coil. The mathematical calculation results were verified by simulated ones.