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A Study on the Design of the Termination Part for a 23kV Superconducting Cable
Bella Eliana,Dewimaruto Ratri,Seunghee O,Younghun Park,Hyoungku Kang 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.7
In this paper, a study on the design of the termination part for a 23kV superconducting cable is conducted. Also, the design of a spacer is derived in consideration of electrical and mechanical safety factors. In general, the termination part of a superconducting cable is filled with gaseous nitrogen (GN₂) and gaseous sulphur hexafluoride (SF<SUB>6</SUB>), and may have a temperature gradient from cryogenic to room temperature. Therefore, a design considering the dependency of dielectric characteristics on temperature should be conducted. In this study, the criterion of electric field intensity on the creepage discharge characteristics between a solid and gaseous insulation material according to several conditions is derived through dielectric experiments. Also, overall design of the termination part for a 23kV superconducting cable is proposed considering the mechanical as well as electrical safety factors.
친환경 전력케이블용 PP의 백화현상에 의한 절연특성 변화에 대한 연구
Bella Eliana,Dewimaruto Ratri,오승희(Seunghee O),박영훈(Younghun Park),강형구(Hyoungku Kang) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.12
Cross linked polyethylene (XLPE) has been widely used for power cables as an insulation material due to its excellent dielectric and mechanical characteristics. However, XLPE can not be recycled after the lifetime of power cables because of its thermosetting property. In many countries, power cables have been developed and installed actively since 1970. It means that the lifetime of power cables is reaching over 50 years. It is known that the lifetime of power cables is around 50 years. Therefore, many power cables in a power grid installed in 1970s should be replaced with new power cables in order to improve the reliability of a power system. In this replacement, there are many studies to change thermosetting materials, XLPE into thermoplastic materials, polypropylene (PP) which can be recycled. This paper deals with the analysis on the dielectric degradation characteristics of PP according to white rust. White rust may occur in power cables due to curvature and scratch which could be caused by bending stress and friction. Especially bending stress is inevitable because of narrow installation area and process of installation. The dielectric degradation characteristics of PP are analyzed under AC as well as lightning impulse voltage test. It is found that the dielectric degradation characteristics of PP according to white rust is more degraded at lightning impulse voltage test than AC voltage test.
Study on the Mechanical Stress of Insulators for Application of 25 ㎸ Railway Traction Lines
Eliana Bella,Minkyung Jeong,Youngdae An,Jongdoug Lee,Hyoungku Kang 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.7
In this paper, mechanical stresses on railway traction line insulators are analyzed by structural analysis. In application of railway traction lines, insulators are not only used to insulate but also subjected to adverse environmental conditions and mechanical vibrations. Two kinds of test to verify the robustness of insulators are performed in this study. Cantilever load test and tensile force test are carried out to ensure the reliability and stability of railway traction line insulators. Structural analysis that focuses on cantilever load test and tensile force test is carried out by using COMSOL Multiphysics. Finally, safety factors of each railway insulator are presented as results.
초전도케이블용 Stop Joint Box 설계를 위한 연면방전 특성에 관한 연구
오승희,Bella Eliana,Dewimaruto Ratri,박영훈,강형구 한국조명.전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.5
A study on the development of a superconducting cable has been conducted actively due to its ‘0’ resistance characteristics. A superconducting cable consists of three parts: termination, core, and joint box. A joint box could be classified into normal joint box (NJB) and stop joint box (SJB) according to its structure. In this paper, a study on the development of the design technology of SJB where a bulkhead is installed to maintain a constant pressure and temperature of a cryogenic system is conducted. In an SJB system, a bulkhead is installed at a superconducting core system and impregnated with epoxy resin, and then wound with polypropylene laminated paper (PPLP) in order to insulate the superconducting core system. The creepage discharge characteristics along the surface of a solid insulation material in liquid nitrogen (LN2) are investigated through dielectric experiments and the criterion to perform electrical insulation design of an SJB system for a distribution superconducting cable is proposed.
Conceptual Design of the Termination Part for a Transmission Superconducting Fault Current Limiter
Kang Hyoungku,Bella Eliana,Ratri Dewimaruto,O Seunghee,Park Younghun 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
One of the critical components for high-voltage superconducting apparatuses, such as superconducting fault current limiters (SFCLs), superconducting cables, and superconducting transformers, is the termination part. The termination part supplies power to superconducting coils without insulating diffi culties, and it is designed considering several conditions, such as temperature and pressure. Generally, the termination part for a high-voltage SFCL is divided by a spacer into SF 6 and gaseous nitrogen (GN 2 ) parts. To design an electrically reliable termination part, dielectric experiments on the sparkover and creepage discharge along the surface of a solid material in GN 2 are performed, and the dielectric characteristics of the electric fi eld intensity at the sparkover of GN 2 and creepage discharge along the surface of a solid material in GN 2 are expressed as an empirical formulae in terms of the fi eld utilization factor ( ξ ). As a result, the electrical and mechanical design of the termination part including a spacer with respect to the material and shape is conducted. Finally, a conceptual design of the termination part for a 220 kV high voltage SFCL is proposed. The experimental results and design method proposed in this paper were applied to the design of the world’s largest commercial 220 kV/300MVA SFCL installed and operating in Moscow
Electrical Breakdown Characteristics of Polypropylene for an Eco-Friendly Power Cable
Dewimaruto Ratri,Bella Eliana,Seunghee O,Younghun Park,Hyoungku Kang 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.4
Cross Linked Polyethylene (XLPE) has been widely used as an insulation material of a power cable due to its excellent electrical and mechanical properties. XLPE may cause an environmental devastation because it is not recyclable due to its thermosetting characteristics. Therefore, it is necessary to develop an insulation material which could be replaced with the conventional XLPE owing to its eco-friendly and good dielectric characteristics. In this paper, an analytic study on the comparison between conventional XLPE and six types of eco-friendly polypropylene (PP) samples developed by Hu-innovation Co. Ltd is conducted. As a result, the dielectric characteristics of PP according to manufacturing process are analyzed.