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<p>South Korea’s power system maintains high stability through a time-based management (TBM) approach that considers risk, proactively replacing electrical apparatus before failure to fundamentally ensure the system’s reliability. However, this preventive strategy, crucial for managing South Korea’s power infrastructure, incurs substantial infrastructure investment costs. In the current context of emphasizing sustainable energy circulation and carbon neutrality, revisiting this method is imperative. While the majority of gas-insulated switchgear (GIS) equipment in South Korea is decommissioned after 24–27&#xa0;years, many developed countries opt for life extension based on condition assessments conducted after a predetermined period of usage. This study involves dismantling an indoor GIS unit, which had been operational for 27&#xa0;years at an indoor substation, to conduct a comprehensive condition assessment and investigate its potential for remanufacturing. The processes involved visual inspection, disassembly inspection, test evaluation, and assessments of O-rings and grease. The study suggests and applies an enhanced critical condition code (CCC) technique to facilitate an objective evaluation of the GIS’s aging status. This method proposes a way to operate GIS more effectively through scheduled maintenance techniques, indicating the possibility of managing assets more appropriately in the context of Korea’s asset management approach considering risk. Furthermore, this research estimated the anticipated life extension costs alongside the condition assessment results, evaluating the feasibility of extending the lifetime of aged GIS units. These findings highlight the significance of planned maintenance techniques in potentially enabling more effective operation of GIS.</p>

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Condition Assessment of an Aged 25.8kV GIS: Evaluating the Potential for Life Extension

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Uhyeon Jo,
  • Ragil Handito,
  • Yechan Kim,
  • Bonhyuk Ku,
  • Minkyung Jeong,
  • Jinwoo Jeong,
  • Chanyoung Lee,
  • Hyoungku Kang

摘要

South Korea’s power system maintains high stability through a time-based management (TBM) approach that considers risk, proactively replacing electrical apparatus before failure to fundamentally ensure the system’s reliability. However, this preventive strategy, crucial for managing South Korea’s power infrastructure, incurs substantial infrastructure investment costs. In the current context of emphasizing sustainable energy circulation and carbon neutrality, revisiting this method is imperative. While the majority of gas-insulated switchgear (GIS) equipment in South Korea is decommissioned after 24–27 years, many developed countries opt for life extension based on condition assessments conducted after a predetermined period of usage. This study involves dismantling an indoor GIS unit, which had been operational for 27 years at an indoor substation, to conduct a comprehensive condition assessment and investigate its potential for remanufacturing. The processes involved visual inspection, disassembly inspection, test evaluation, and assessments of O-rings and grease. The study suggests and applies an enhanced critical condition code (CCC) technique to facilitate an objective evaluation of the GIS’s aging status. This method proposes a way to operate GIS more effectively through scheduled maintenance techniques, indicating the possibility of managing assets more appropriately in the context of Korea’s asset management approach considering risk. Furthermore, this research estimated the anticipated life extension costs alongside the condition assessment results, evaluating the feasibility of extending the lifetime of aged GIS units. These findings highlight the significance of planned maintenance techniques in potentially enabling more effective operation of GIS.