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Degradation Characteristics of 2G HTS Wires According to Lightning Impulse Voltage
Handito Ragil(한디토 라길),Seunghee Oh(오승희),Minkyung Jeong(정민경),Bimaridi Afif(비마리디 아피프),Jinhyung Park(박진형),Woocheol Shin(신우철),Uhyeon Jo(조우현),Seongkeon Park(박성건),Hyoungku Kang(강형구) 한국조명·전기설비학회 2022 한국조명·전기설비학회 학술대회논문집 Vol.2022 No.11
절연파괴에 따른 2세대 고온 초전도선재의 열화특성에 관한 연구
Bimaridi Afif,오승희,박영훈,박진형,조우현,신우철,Ragil Handito,박성건,강형구 한국조명.전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.3
2G high temperature superconducting (HTS) wires have been widely adopted to develop high voltage superconducting apparatuses such as a superconducting fault current limiter (SFCL), a superconducting cable, a superconducting transformer, and so on. A study on the dielectric degradation characteristics of 2G HTS wires due to electrical breakdown should be performed to enhance the stability and to accelerate the commercialization of high voltage superconducting apparatuses. In this study, the degradation characteristics of 2G HTS wires, SCN-04 made by SuNAM Co., Ltd. are analyzed by dielectric experiments with AC and lightning impulse voltage in saturated liquid nitrogen (LN2) of 77K. The 2G HTS wire used in this study has silver stabilizing layers on both sides of GdBCO layer. Also, the substrate is made with stainless steel and whole 2G HTS wire is surrounded by copper. It is verified that the degree of degradation of the 2G HTS wire is affected by the magnitude of the applied voltage and the type of voltage. Also, cracked GdBCO layer due to electrical breakdown is shown by scanning electron microscope (SEM) image. The degradation characteristics such as critical current and index n of 2G HTS wire due to electrical breakdown can be explained by mechanical cracked structure of a GdBCO layer.
Stabilizer에 따른 2세대 고온 초전도 선재의 전기적 열화특성 비교
Bimaridi Afif,오승희,박영훈,박진형,조우현,신우철,Ragil Handito,박성건,강형구 한국조명.전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.5
2G High temperature superconducting(HTS) conductors are usually considered as appropriate superconductors for a superconducting coil to develop an applied superconducting apparatus such as a superconducting fault current limiter(SFCL), a superconducting cable, and a superconducting accelerator with high voltage or high ramping-up rate condition. The electrical degradation characteristics of HTS conductors due to electrical breakdown should be taken into consideration because high electric field intensity induced by high operating voltage or rapid ramping-up rate can affect the dielectric stability. In this study, the electrical degradation characteristics of 2G HTS conductors with different metal stabilizers made by SuNAM Co., Ltd. are analyzed and compared through dielectric experiments. As results, the most appropriate type of a 2G HTS conductor is recommended to manufacture superconducting apparatuses with a high voltage or rapid ramping-up rate condition.
통전전류에 따른 ACSR-OC 전선의 인장강도 열화특성에 관한 연구
박진형,오승희,Bimaridi Afif,조우현,신우철,Ragil Handito,박성건,김동명,김영화,강형구 한국조명.전기설비학회 2022 조명·전기설비학회논문지 Vol.36 No.7
Power cables are essential apparatuses to transmit electricity in power grid. The reliability of power cables is related not only to dielectric characteristics of an insulation material but also to mechanical characteristics that may be affected by operating conditions. ACSR-OC (aluminum conductor steel reinforced outdoor cross-linked polyethylene insulated wire) wires have been widely used in urban power systems and are mainly used in distribution lines. When over-current is transported through ACSR-OC wires, there could be some mechanical degradation as well as electrical degradation. Degradation of wires caused by over-current may cause serious accidents such as electrical breakdown, disconnection, and so on. In this paper, a tensile strength test of an ACSR-OC wire core according to applying time and amplitude of over-current is conducted. As a result, it is found that the tensile strength of the ACSR-OC core decreases due to the over-current.