A switchgear is an electrical equipment mainly used in power systems (such as power plants, substations, petrochemicals, metallurgical steel rolling, light industry textiles, factories, mining enterprises, and residential communities) to receive and distribute electrical energy, and to control, protect, monitor, and measure power lines and major equipment. The switchgear is an indispensable and important equipment in the power system, which is of great significance for ensuring the stable operation of the power system, improving the safety and reliability of equipment.

High voltage switchgear is usually composed of main electrical components such as cabinet body, circuit breaker, isolation switch, transformer, lightning arrester, etc. The cabinet is usually made of cold-rolled steel plate or aluminum zinc coated steel plate, which has the characteristics of high protection level, corrosion resistance, dust and water resistance. The interior of the cabinet is divided into multiple functional units, such as the main busbar room, circuit breaker room, cable room, relay room, etc., to facilitate equipment installation and maintenance.