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V-t Characteristics of a Mini-Cable Model Wound with PPLP for Superconducting Cables
Shin Woocheol,Jo Uhyeon,Park Jinhyung,Oh Seunghee,Handito Ragil,Jeong Minkyung,Park Seongkeon,Kang Hyoungku 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.1
A distribution-level high-temperature superconducting (HTS) cable connecting the Shingal and Heungdeok substations in South Korea was commercialized in 2019. This project successfully installed a 23 kV HTS cable between the secondary buses of two 154 kV substations. Furthermore, a triaxial HTS cable connecting the Munsan and Seonyu substations is scheduled for commercialization in 2024. An HTS cable wound with polypropylene laminated paper (PPLP) as an insulation medium operates in liquid nitrogen (LN2) because of its superior dielectric characteristics under cryogenic conditions. Generally, an HTS cable is known for its high efficiency and extended lifespan compared with conventional power cables because it experiences no thermal degradation owing to Joule heat generation. However, the dielectric characteristics of HTS cables may deteriorate over time because of their long-term operation in high-voltage environments. We conducted dielectric experiments on two types of PPLP with varying polypropylene (PP) ratios and pressures and examined their V-t characteristics using a mini-cable model.
25.8 kV 옥내용 노후 GIS O-ring의 건전도 평가에 관한 연구
김예찬(Yechan Kim),정민경(Minkyung Jeong),조우현(Uhyeon Jo),Ragil Handito,구본혁(Bonhyuk Ku),강형구(Hyoungku Kang) 대한전기학회 2024 전기학회논문지 Vol.73 No.5
Asset management in power industries is crucial for maximizing asset value by considering life-cycle data and ensuring reliability and cost-effectiveness. This paper addresses the paradigm shift in asset management strategies from traditional approaches to Condition-Based Risk Management (CBRM). Unlike international practices, South Korea relies on Risk-Based Replacement (RBR), which assesses risk based on equipments years of service, leading to premature replacements of Gas-Insulated Switchgear (GIS) without considering equipment condition. Consequently, asset value maximization is hindered. To address this, the paper evaluates the degradation characteristics and health condition of aging GIS O-rings used for approximately 27 years. The collected O-ring samples were in excellent condition. The findings contribute to efficient maintenance cycle determination and the establishment of economical and efficient power facility asset management strategies.