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민치현(Chi-Hyun Min),곽동순(Dong-Sun Gwak),천현권(Hyun-Kwon Chun),최진욱(Jin-Wook Choi),김영석(Young-Suk Kim),김선구(Sun-Gu Kim),김상현(Sang-Hyun Kim) 한국조명·전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.4
일반적으로 22.9[㎸] 이하의 케이블은 가교폴리에틸렌(XLPE)을 절연체로 사용하고 있다. XLPE 내부의 결함으로 인한 사고로 경제적 및 인명피해가 발생한다. 이러한 사고에 대한 처리 기준이 마련이 되어 있지 않아 사고처리의 체계화가 시급히 필요한 실정이다. 본 연구에서는 XLPE 케이블의 사고 요인이 되는 전기적 열화현상에 대한 자료구축을 위하여 XLPE에 곡율반경이 10[㎛]인 침천극을 삽입하여 절연파괴, 트리형상 및 연면방전 시료를 제작하였다. 단시간 파괴는 AC 60[㎐]의 전압을 l[㎸/sec] 상승하였으며, 장기과전의 경우 AC 60[㎐]의 전압을 12[㎸] 및 17[㎸]를 인가하여 전기적 열화 특성에 대하여 실험을 하였다. XLPE cable is using insulator for Cross Linked Polyethylene(XLPE), because insulation Performance is superior and easy comparatively. Need systematization of accident transaction for electrical equipment accident, It is no disposal standard for defect of manufacture and second to accidents. in this paper deals with the change of XLPE cable insulation To understand the electrical properties of XLPE insulation Made of XLPE block sample, Penetration fracture Sample and flashover sample. Ogura needles having tip radius of 10[㎛] were inserted into each sample. AC voltage of 1[㎸/sec] increased at 60[㎐] were apple to breakdown sample and flashover sample. AC voltages of 12[㎸], 17[㎸] at 60[㎐] were applied to XLPE block sample. The electrical properties of specimens were measured were Treasured from initiation of tree and breakdown to their characteristics were analyzed.
손명환(Myung Hwan Sohn),민치현(Chi Hyun Min),이언용(Eon Yong Lee),심기덕(Ki Deok Sim),김석호(Seokho Kim),성기철(Ki Chul Seong) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Various different types of joining between High Tc superconducting(HTS) tapes were prepared and current-voltage (I-V) characteristic curves were investigated at 77 K, liquid nitrogen temperature. Two types of HTS tapes were used, one is no laminated tape(Sumitomo high strength type tape) and the other stainless steel laminated tape(AMSC(American Superconductors Inc.) 3ply tapes) Sample joints were lap-jointed with indium or solder. Joint resistances between Sumitomo tapes with 4-10 ㎜ in length were estimated from I-V curves and in the range of 4-8nℓ at 77 K. Joint resistances of AMSC tapes were in the range of 140-170nℓ, much higher than them of Sumitomo samples. The n-values of jointed HTS tapes were 50% of them with no joint. In AMSC tapes, indium is better than solder as the jointing material.
Harltley 함수를 이용한 선형시스템의 상태해석에 관한 연구
김범수(Beom-Soo Kim),민치현(Chi-Hyun Min) 제어로봇시스템학회 2012 제어·로봇·시스템학회 논문지 Vol.18 No.9
In this paper Hartley functions are used to approximate the solutions of continuous time linear dynamical system. The Hartley function and its integral operational matrix are first presented, an efficient algorithm to solve the Stein equation is proposed. The algorithm is based on the compound matrix and the inverse of sum of matrices. Using the structure of the Hartley’s integral operational matrix, the full order Stein equation should be solved in terms of the solutions of pure algebraic matrix equations, which reduces the computation time remarkably. Finally a numerical example is illustrated to demonstrate the validity of the proposed algorithm.
600kJ급 전도냉각 HTS SMES의 미니모델 제작 및 절연평가
崔在亨(Jae-Hyeong Choi),郭東洵(Dong-Soon Kwag),千賢權(Cheon-Gweon Cheon),閔治顯(Chi-Hyun Min),金海鍾(Hae-Jong Kim),金相賢(Sang-Hyun Kim) 대한전기학회 2007 전기학회논문지 Vol.56 No.3
The 600kJ class high temperature superconducting magnetic energy storage (HTS SMES) system is being developed by Korean Electrotechnology Research Institute (KERI). The system is operated in cryogenic temperature and high vacuum condition. The SMES magnet was cooled by conduction cooling method using a Gifford-McMahon cycle cryocooler. Thus, electric insulation design at cryogenic temperature and high vacuum is a key and an important element that should be established to accomplish compact design is a big advantage of HTS SMES. This paper describes the electric insulation design, fabrication and experimental results for a mini model of conduction cooled HTS SMES.
孫明煥(Myung-Hwan Sohn),沈基德(Ki-Deok Sim),金錫鎬(Seokho Kim),金海鍾(Hae-Jong Kim),裵俊漢(Joon-Han Bae),李彦容(Eon-Young Lee),閔治顯(Chi-Hyun Min),成耆哲(Ki-Chul Seong) 대한전기학회 2006 전기학회논문지 B Vol.55 No.12
High temperature superconductor (HTS) winding coil is one of the key component in superconducting device fabrication. Double-pancake style coils are widely used for such application. High resistance between pancake coils greatly affects the machine design, operating condition and thus the stability. In order to reduce such resistance, experimentalists are looking for efficient and damage free coil connecting methods. In this respect, here we proposed parallel joining method to connect the coils. This is to do crossly joining with HTS tapes on two parallel HTS tapes. Joint samples between two parallel HTS tapes were prepared by using HTS tapes and current-voltage (Ⅰ-Ⅴ) characteristic curves were investigated at liquid nitrogen temperature i.e., 77.3 K. A 20 ㎝ length joint connected between two parallel HTS tapes shows 32.5 nΩ, for currents up to 250 A. A small HTS magnet, having two double pancake sub-coils connected together through new parallel joint method was fabricated and their current-voltage (Ⅰ-Ⅴ) characteristic curve was investigated. At 77.3K, critical current(lc) of 97 A and resistance of 55 nΩ for currents upto 130 A were measured. At operating current 86 A lower than Ic, Joule heats generated in whole magnet and at joint region between sub-coils were 226 ㎽ and 0.4 ㎽, respectively. Low Joule heat generation suggests that this joining method may be used to fabricate HTS magnet or windings.