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Gas Insulated Switchgear (GIS) Using an Environmentally Sound Natural Origin Gas AEROXIA™

  • Environment
  • Climate Change
  • Activities in Products

Toshiba Energy Systems & Solutions Corporation

The gas insulated switchgears (GIS) installed in power plants and substations typically use sulfur hexafluoride (SF6) gas, which has high insulation performance, as the insulation medium. However, this gas has a global warming potential (GWP)*1 24,300 times higher than that of CO2, and legal regulations*2 on the use of SF6 gas in power equipment are already in effect in Europe and North America.
Toshiba Energy Systems & Solutions Corporation has launched a new brand of power transmission and distribution equipment, AEROXIA™. Using gases found in nature as the insulating medium, the company is expanding its product lineup. In 2022, a 72/84 kV GIS was developed and delivered to upgrade the GIS at TEPCO Power Grid, Inc.'s Fuchu Substation. By improving the surface conditions for high-voltage conductors and optimizing the arc-extinction method of the gas-insulated switchgear, the equipment achieves a size that is compatible with existing SF6 gas GIS.
This device is Japan’s first SF6 gas-free GIS for power applications,*3 and it has been operating commercially without incident since its commissioning in February 2023. Furthermore, type tests of AEROXIA™ gas-insulated busbars (GIB) and surge arrestor (SA) rated at 420/550 kV have been completed, and also full 550 kV GIS including switching components is under development. Going forward, Toshiba Energy Systems & Solutions Corporation will continue to develop power transmission and distribution equipment that balances environmental impacts reduction with improved reliability, thereby contributing to the realization of carbon-neutral power systems.

  • A figure that represents the capacity of non-carbon dioxide greenhouse gases to contribute to global warming using carbon dioxide as the reference. (GWP:Global Warming Potential) , the figures are from the IPCC Assessment Report 6 (2024)
  • Regulation (EU) No 517/2014 on fluorinated greenhouse gases
  • Survey by Toshiba Corporation (as of July 12, 2022)

Gas insulated switchgear (GIS) for 72 kV/84 kV using a natural origin gas