The SEH-12 environmental protection gas insulated metal enclosed switchgear produced by our company is the main circuit power supply and distribution equipment of 12kV primary system, with nitrogen as the main insulation medium, and the internal vacuum arc extinguishing adopts the composite insulation structure of solid insulation. It is widely used in areas with high requirements for environmental protection and power supply reliability, areas with poor operating environment and remote areas, inconvenient transportation and transportation, and areas difficult to patrol and maintain.