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자기에너지 하베스팅을 이용한 전기설비의 무선 누전과열 경보기 개발
배준한,문성춘,안한열 대한전기학회 2023 전기학회논문지 Vol.72 No.12
The MEH wireless earth leakage overheating alarm was developed to prevent electric shock and fire accidents in a switchgear. First, the MEH induction coil was designed based on the theoretical background and the output characteristics of the MEH induction coil were numerically analyzed. Also a prototype MEH wireless earth leakage overheating alarm was fabricated and the minimum operating current temperature accuracy and leakage current performance in non-operation or operating mode were confirmed through test. The MEH wireless earth leakage overheating alarm developed through this study can be utilized for IoT-based electrical safety diagnosis to prevent electric shock and fire in power facilities.
배준한,주민석,고태국 연세대학교 대학원 1994 延世論叢 Vol.30 No.1
This thesis is a study on the quench characteristics in epoxy impregnated superconducting magnet. Teh normal 3one propagation velocity, full quench time and full recovery time in a superconducting magnet during quench are simulated numerically. Propagation velocity is linearly proportional to the transport current and abruptly increases near the critical current. Longitudinal velocity is nearly 20 times of transverse velocity regardless of the transport current. The ratio of the transverse velocity to longitudinal velocity is about 0.04 regardless of the transport current and the full quench time is abruptly decreased near the minimum propagation current. Comparing superconducting composites composed of Cu matrix to the composites of Cu/CuNi matrix, the propagation velocity of the former is slower than the latter, while the full quench time of the former is longer under the same transport curent.
전도냉각형 고온초전도 Wire의 전류도입부에서의 열적 퀜치
배준한,배덕권,박해용,손명환,성기철,Bae, Joon-Han,Bae, Duck-Kweon,Park, Hae-Yong,Shon, Myung-Hwan,Seong, Ki-Chul 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7
The heat generation in the high-$T_c$ superconducting (HTS) wire is related with the cost efficiency and safe factor of HTS devices. This paper deals with the thermal quench at the conduction-cooled joint between HTS wire and copper terminals. The 3-D numerical simulation of thermal distributions in part of the copper terminals was implemented and the premature quench at copper block was observed through the test. The results will be helpful to design the conduction-cooled HTS magnets.
냉동기 부착형 전도냉각식 Cryostat의 설계 및 제작
裵俊漢(Joon Han Bae),沈基德(Ki Deck Sim) 대한전기학회 2007 전기학회논문지 Vol.56 No.11
In order to measure the superconducting transition temperature, the critical current and the alternating current(AC) loss on short samples of high temperature superconductor, a cryocooler cooled cryostat has been designed and built. Two closed-cycle coolers provide cooling with an ultimate sample temperature below 16K. Temperature regulation is provided by 50W of electrical heater that opposes the cooling power from the cold heads. Temperature control feedback is by means of a cernox temperature sensor co-located with the heaters on the second stage of the cold head. Additional temperature sensors are located on the sample mount(B1), on the CVI cold head(B2) and on the Dakin cold head(B3). AC losses on the sample high temperature superconductor were measured at 30K so that the developed device performance was evaluated. In this paper, the design, fabrication and test results on the cryocooler cooled cryostat are presented.
裵俊漢(Joon-Han Bae),成耆哲(Ki-Chul Seong) 대한전기학회 2007 전기학회논문지 Vol.56 No.6
We designed and manufactured a 1.8T high temperature superconducting (HTS) insert coil for a NMR magnet operated at 4.2 K. Suitable HTS superconductor and HTS coil were carefully designed and developed. We have selected multi-filamentary Bi2223 conductor fabricated by American Superconductor Corporation(AMSC). The selected conductor consists of Bi2223 filaments of 55, silver stabilizer and stainless steel reinforcement tapes. Therefore, it shows good hoop strength as well as compression tolerance. The conductor has a tape cross-section of 0.31㎜×4.8㎜. the Bi2223 conductor shows large anisotropy of critical current. The critical current of conductor in magnetic field parallel to the flat surface are much higher than that in magnetic field perpendicular, The HTS coil has an inner diameter of 78 ㎜, an outer diameter of 127 ㎜ and a coil length of 600 ㎜. In this paper, the detailed design, fabrication and test results on the HTS insert coil are presented.
고온초전도 전력케이블의 안정도 평가를 위한 교류손실에 관한 연구
裵俊漢(J.H. Bae),崔錫鎭(S.J. Choi),李相鎭(S.J. Lee),趙全旭(J.W. Cho) 대한전기학회 2007 전기학회논문지 Vol.56 No.7
In order to evaluate if the high-To superconducting(HTS) power cable is operating stably, the characteristics of the HTS power cable should be found out. The properties of HTS tapes by measuring the voltage with respect to the current can be archived. But, the HTS power cable is different from the case of HTS tapes. This method is invalid because of the electromagnetic fields caused by other HTS tapes. In this paper, the stability evaluation of the HTS cable was performed by the following procedure. First, the voltage-current characteristics of HTS tape were measured and the electromagnetic field distributions of the HTS power cable with the external magnetic field were analyzed. Second, the losses of the HTS power cable were calculated using the result of the measurement and the analysis. Finally, the stable operation of the HTS power cable was evaluated on the basis of the losses of the superconducting cable.