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<p>Sulfur hexafluoride (SF<sub>6</sub>) has been widely employed in gas-insulated switchgears (GIS) due to the excellent dielectric strength and chemical stability, but its extremely high global warming potential (GWP) of 23,500 has driven the development for alternatives. Even though green gas for grid (g<sup>3</sup>) has been regarded as a promising substitute with a reduced GWP, recent studies have sought gases with even lower environmental impact. Korea Electrotechnology Research Institute (KERI) recently developed a new eco-friendly insulation gas, K6, composed of perfluoro methyl vinyl ether (PMVE), whose GWP is below 1. This paper experimentally investigated partial discharge (PD) characteristics of K6 under typical external defects in GIS: protrusion on conductor (POC); and protrusion on enclosure (POE). Key PD parameters, including partial discharge inception voltages (PDIV), partial discharge extinction voltages (PDEV), and phase-resolved partial discharge (PRPD) patterns, were measured and compared with those of SF6, dry air, and g<sup>3</sup>at 0.1 to 0.5&#xa0;MPa. From the experiments, K6 exhibited higher PDIVs and PDEVs than dry air and comparable dielectric performance to g³, while also demonstrating distinct PD activities under negative polarity.</p>

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Partial Discharge Characteristics of a New Eco-Friendly Insulation Gas Under Metal Protrusion Defects in Gas-Insulated Switchgear Structures

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • Gyeong-Yeol Lee,
  • Sung-Wook Kim

摘要

Sulfur hexafluoride (SF6) has been widely employed in gas-insulated switchgears (GIS) due to the excellent dielectric strength and chemical stability, but its extremely high global warming potential (GWP) of 23,500 has driven the development for alternatives. Even though green gas for grid (g3) has been regarded as a promising substitute with a reduced GWP, recent studies have sought gases with even lower environmental impact. Korea Electrotechnology Research Institute (KERI) recently developed a new eco-friendly insulation gas, K6, composed of perfluoro methyl vinyl ether (PMVE), whose GWP is below 1. This paper experimentally investigated partial discharge (PD) characteristics of K6 under typical external defects in GIS: protrusion on conductor (POC); and protrusion on enclosure (POE). Key PD parameters, including partial discharge inception voltages (PDIV), partial discharge extinction voltages (PDEV), and phase-resolved partial discharge (PRPD) patterns, were measured and compared with those of SF6, dry air, and g3at 0.1 to 0.5 MPa. From the experiments, K6 exhibited higher PDIVs and PDEVs than dry air and comparable dielectric performance to g³, while also demonstrating distinct PD activities under negative polarity.