{
  "language": "en",
  "interfaceLanguage": "ar",
  "url": "https://voltformer.com/ar/news/kansai-electric-mitsubishi-electric-energize-275kv-sf6-free-gis-substation",
  "slug": "kansai-electric-mitsubishi-electric-energize-275kv-sf6-free-gis-substation",
  "category": "transformers-grid",
  "publishDate": "2026-09-28",
  "sourceName": "Kansai Electric Power & Mitsubishi Electric Corporation",
  "sourceUrl": "https://www.kansai.co.jp/press/2026/09/275kv-sf6-free-clean-air-gis-substation-energization-osaka.html",
  "readingTimeMinutes": 5,
  "tags": [
    "Kansai Electric",
    "Mitsubishi Electric",
    "275 kV GIS",
    "SF6-Free",
    "Clean Air",
    "Vacuum Circuit Breaker",
    "Japan Grid",
    "Substation Decarbonization"
  ],
  "content": {
    "title": "Kansai Electric and Mitsubishi Electric Energize Commercial 275 kV SF6-Free Clean Air GIS Substation in Osaka",
    "summary": "The Kansai Electric Power Company and Mitsubishi Electric Corporation have energized Japan’s first commercial 275 kV gas-insulated substation (GIS) operating entirely without sulfur hexafluoride (SF6), utilizing dry clean air dielectric insulation and high-voltage vacuum circuit breakers to eliminate potent greenhouse gases from urban power infrastructure.",
    "sections": [
      {
        "heading": "Eliminating SF6 from High-Voltage Urban Transmission Substations",
        "paragraphs": [
          "Sulfur hexafluoride (SF6) possesses a global warming potential 24,300 times greater than CO2, prompting global grid operators to seek zero-GWP switchgear alternatives. On September 28, 2026, Kansai Electric energized a flagship 275 kV substation in the Osaka metropolitan area engineered by Mitsubishi Electric.",
          "The facility replaces traditional SF6 insulation with pressurized natural clean air (a precision dry mixture of 80% nitrogen and 20% oxygen), ensuring zero toxic decomposition byproducts and zero greenhouse gas impact throughout its 40-year design lifetime."
        ]
      },
      {
        "heading": "High-Capacity 275 kV Vacuum Circuit Breaker (VCB) Breakthrough",
        "paragraphs": [
          "Because clean air lacks the intense arc-quenching capability of SF6, Mitsubishi Electric developed an advanced high-power vacuum interrupter bottle capable of breaking short-circuit currents up to 50 kA at 275 kV.",
          "The substation connects two 300 MVA 275/77 kV low-noise power transformers, feeding critical urban rail networks and commercial districts with verified zero-emission high-voltage switching reliability."
        ]
      },
      {
        "heading": "Setting the Standard for Asia-Pacific Substation Decarbonization",
        "paragraphs": [
          "Kansai Electric announced that the success of the Osaka installation establishes the engineering baseline for retiring legacy SF6 switchgear across its transmission territory, accelerating Japan’s 2050 carbon-neutrality commitments."
        ]
      }
    ]
  },
  "companies": []
}