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Kwag Dong-Soon,Cheon Hyeon-Gweon,Choi Jae-Hyeong,Kim Sang-Hyun The Korean Society of Superconductivity and Cryoge 2006 한국초전도저온공학회논문지 Vol.8 No.2
A research on several characteristics such as volume breakdown and surface discharge of insulators for a termination of power transmission class HTS cable was performed. We investigated the surface discharge of glass fiber reinforced plastic (GFRP) under air, cryogenic nitrogen gas and nitrogen gas media. The breakdown characteristics of these media were studied. Experimental results revealed that flashover voltage greatly depends on pressure, temperature, the kinds of insulating media and voltages, but it is slightly affected by shape and material of electrode. The breakdown voltage of liquid nitrogen, cryogenic nitrogen gas and nitrogen gas deeply depends on the shape and dimension of electrode, kinds of voltages and pressure. Moreover, the breakdown voltage of cryogenic nitrogen gas and flashover voltage of GFRP in the cryogenic nitrogen gas is also influenced by temperature and vapour-mist density of the gas.
천현권,최재형,곽동순,김해종,성기철,윤문수,김상현,Cheon Hyeon-Gweon,Choi Jae-Hyeong,Kwag Dong-Soon,Kim Hae-Jong,Seong Ki-Chul,Yun Mun-Soo,Kim Sang-Hyun 한국전기전자재료학회 2006 전기전자재료학회논문지 Vol.19 No.6
Toward the practical applications, on operation of conduction-cooled HTS SMES at temperatures well below 77 K should be investigated, in order to take advantage of a greater critical current density of HTS and considerably reduce the size and weight of the system. Recently, research and development concerning application of the conduction-cooled HTS SMES that is easily movement are actively progressing in Korea. Electrical insulation under cryogenic temperature is a key and an important element in the application of this apparatus. Using multi wrapped copper by Polyimide film for HTS SMES, the breakdown characteristics of models for turn-to-turn, that is surface contact model, were investigated under ac and impulse voltage at 77 K. A material that is Polyimide film (Kapton) 0.025 mm thickness is used for multi wrapping of the electrode. Statistical analysis of the results using Weibull distribution to examine the wrapping number effects on breakdown voltage under at and impulse voltage in $LN_2$ was carried.
The Electrical Insulation Design of 600 kJ Conduction Cooled HTS SMES
Jae-Hyeong Choi,Dong-Soon Kwag,Hyeon-Gweon Cheon,Chi-Hyun Min,Hae-Jong Kim,Ki-Chul Seong,Sang-Hyun Kim IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>The electrical insulation design of 600 kJ conduction cooled high temperature superconducting magnetic energy storage (HTS SMES) has been studied in this paper. High voltage is generated to both ends of magnet of HTS SMES by quench or energy discharge. Therefore, the insulation design of the high voltage needs for stability and reliability to allow commercialization. In this study, we analyzed the insulation composition of a HTS SMES, and investigated about the insulation characteristics of materials such as Kapton, AlN,Al<SUB>2</SUB>O<SUB>3</SUB>, GFRP and vacuum at cryogenic temperatures. Based on these results, the insulation design for 600 kJ conduction cooled HTS SMES was performed.</P>
Electrical insulating design of 600kJ conduction cooled HTS SMES
Choi, Jae-Hyeong,Kwag, Dong-Soon,Cheon, Hyeon-Gweon,Min, Chi-Hyun,Kim, Hae-Jong,Seong, Ki-Chul,Kim, Sang-Hyun The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.2
The electrical insulation design and withstanding test of mini-model coils for 600 kJ class conduction cooled high temperature superconducting magnetic energy storage (HTS SMES) have been studied in this paper. The high voltage is generated to both ends of magnet of HTS SMES by quench or energy discharge. Therefore, the insulation design of the high voltage needs for commercialization, stability, reliability and so on. In this study, we analyzed the insulation composition of a HTS SMES, and investigated about the insulation characteristics of the materials such as Kapton, AIN and vacuum in cryogenic temperature. Base on these results, the insulation design for 600 kJ conduction cooled HTS SMES was performed. The mini-model was manufactured by the insulation design, and the insulation test was carried out using the mini-model.
최재형,곽동순,천현권,김해종,김상현,Choi, Jae-Hyeong,Kwag, Dong-Soon,Cheon, Hyeon-Gweon,Kim, Hae-Jong,Kim, Sang-Hyun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.2
The conduction-cooled HTS SMES is operated in cryogenic and high vacuum condition. Thus, Insulation design at cryogenic temperature and high vacuum is a key and an important element that should be established to accomplish miniaturization that is a big advantage of HTS SMES. However, the behaviors of insulators for cryogenic conditions in vacuum are virtually unknown. Therefore, we need active research and development of insulation concerning application of the conduction-cooled HTS SMES. Therefore, in this study, we experimented about insulation characteristic high vacuum and cryogenic similar to driving condition of SMES system. Also, investigated about insulation characteristic of suitable some materials to insulator for conduction-cooled HTS SMES. As this results, we possessed basis data for insulation materials selection and insulation design for development of 600 kJ class conduction-cooled HTS SMES.
곽동순,천현권,김해종,조전욱,정순용,김상현,Kwag, Dong-Soon,Cheon, Hyeon-Gweon,Kim, Hae-Jong,Cho, Jeon-Wook,Chung, Soon-Yong,Kim, Sang-Hyun 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
For the insulation design of a high temperature superconducting(HTS) cable, three kinds of design method were proposed, which used AC and impulse withstand voltage and partial discharge inception strength. However, the designed insulation thickness by AC and impulse could not be applied to cable fabrication process due to much low electrical breakdown strength. The effect of the multi-layered insulation paper was not considered on the previous insulation design and the insulation thickness by partial discharge inception strength could be applied only. In this paper, the electrical breakdown characteristic, which considered the effect of multi-layered of LPP, was investigated to design the insulation thickness.
崔在亨(Jae-Hyeong Choi),郭東洵(Dong-Soon Kwag),千賢權(Hyeon-Gweon Cheon),金相賢(Sang-Hyun Kim) 대한전기학회 2006 전기학회논문지C Vol.55 No.8
Toward the practical applications, on operation of conduction-cooled HTS SMES at temperatures well below 40[K] should be investigated, in order to take advantage of a greater critical current density of HTS and considerably reduce the size and weight of the system. In order to take advantage of a greater critical current density of high temperature superconducting (HTS) and considerably reduce the size and weight of the system, conduction-cooled HTS superconducting magnetic energy storage (SMES) at temperatures well below 40[K] should be investigated. This work focuses on the breakdown and flashover phenomenology of dielectrics exposed in air and/or vacuum for temperatures ranging from room temperature to cryogenic temperature. Firstly, we summarize the insulation factors of the magnet for the conduction cooled HTS SMES. And Secondly a surface flashover as well as volume breakdown in air and/or vacuum with two kind insulators has been investigated. Finally, we will discuss applications for the HTS SMES including aging studies on model coils exposed in vacuum at cryogenic temperature. The commercial application of many conduction-cooled HTS magnets, however, requires refrigeration at temperatures below 40[K], in order to take advantage of a greater critical current density of HTS and reduce considerably the size and weight of the system. The magnet is driven in vacuum condition. The need to reduce the size and weight of the system has led to the consideration of the vacuum as insulating media. We are studying on the insulation factors of the magnet for HTS SMES. And we experiment the spacer configure effect in the dielectric flashover characteristics. From the results, we confirm that our research established basic information in the insulation design of the magnet.
Composite Bushing 의 실리콘 Shed 수리방법
정용수(Young-soo Chung),오충석(Chung-seok Oh),천현권(Hyeon-gweon Cheon),허준,이동원(Dong-Woen Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The exterior of composite bushing(important component of extra-high voltage equipment) is made of silicone. Therefore, the silicone parts are easily damaged from birds and rodents or bring about tearing on passage unlike porcelain bushings. Also, silicone sheds made at high temperature there can be some bubble in the process of stiffening. In this case, silicone sheds are made repairs with such manufacturer’s small molds but this way incurring a long haul and a needless bother to send a bushing from site to factory. In this paper, we suggest way to fix sheds of bushing directly at site after repairing through degradation testing we checked bushing’s condition.