Abstract
New insulation gases as alternatives to SF6 have been presented in the last years. The main focus has been on technical performance and reduced global warming potential compared with SF6 gas-insulated switchgear (GIS). Another very important aspect for customers is the environmental impact and safety in all operational situations, as well as during leaks or even internal arc failures. This study introduces a solution using AirPlus™ as an insulation gas mixture, with results of comparison tests to SF6 GIS and air-insulated switchgear.
Highlights
In the last few years, researchers have presented alternative insulation gases for medium-voltage (MV) gas-insulated switchgear (GIS)
This paper addresses this issue and demonstrates that, in the context of environmental impact and safety, AirPlus GIS outperforms SF6 GIS
Even in the unlikely event of an internal arc fault, the released gases and powders are less harmful than those generated in SF6 GIS, and they are comparable in toxicity to those created in air-insulated switchgear (AIS) equipment that uses pure air as insulation gas
Summary
In the last few years, researchers have presented alternative insulation gases for medium-voltage (MV) gas-insulated switchgear (GIS). The overall lifecycle of GIS using this gas mixture is of interest with regard to environmental impact and safety during normal operation and in case of failures. These aspects are of great importance to the operator of the switchgear when it comes to the techno-economic analysis and assessment of the compound environmental benefits brought about by choosing the new insulation gas mixture over SF6. Only limited information is available for the customer, which makes a decision in favor of the new technology difficult This paper addresses this issue and demonstrates that, in the context of environmental impact and safety, AirPlus GIS outperforms SF6 GIS. Even in the unlikely event of an internal arc fault, the released gases and powders are less harmful than those generated in SF6 GIS, and they are comparable in toxicity to those created in AIS equipment that uses pure air as insulation gas
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