For decades, sulfur hexafluoride (SF₆) has been the insulation medium of choice for gas-insulated switchgear (GIS). However, SF₆ is the most potent greenhouse gas known, with a global warming potential (GWP) of 23,500. The European Union (EU) aims to reduce greenhouse gas emissions by 55% by 2030 and achieve climate neutrality by 2050. In line with these ambitious targets, efforts are being made across various sectors to adopt more sustainable practices. To align with these goals and gain operational experience with new technologies, Netze BW, a large distribution system operator in southern Germany, built a new substation in Burladingen with SF₆-free GIS for the 110 kV voltage level. This GIS uses “clean air” (80% N₂ and 20% O₂) as the insulation medium, which has a GWP of 0. Additionally, the substation features other innovations, including low-power instrument transformers (LPITs), process bus, and vacuum circuit breakers. Low power instrument transformers (LPITs) LPIT technology offers significant space savings due to its small dimensions. The LPIT consists of a GIS cast COMMISSIONING TESTS IN A 110 KV GIS SUBSTATION WITH LPITs AND PROCESS BUS 42
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