GFM-126 gas-insulated switchgear takes SF6 gas, with excellent insulation performance, as insulation and arc extinguishing mediums to combine all components except for transformer in the substation, such as busbar, disconnector/earth switch, breaker, measurement and protection CT. Lightning arrestor, high speed earth switch, cable connector and other high-voltage devices by modular construction is a combination unit, sealed in metal shell which is full of SF6 gas.
GIS is featured by high reliability, non-pollution, and convenient maintenance, long usage period while requiring small land, which cannot be realized by most traditional air insulated switchgear. GFM-126 also integrates intelligent technologies required by current intelligent substation, and blends electronic CT, merging unit, intelligent terminal, and on-line state monitoring to satisfy the requirements of IEC 61850 standard.