Transmission and distribution equipment is a major key equipment for the development of electricity

Transmission and distribution equipment is mainly used in the power system and industrial and mining enterprises for energy transmission and control, which affects the construction, safety, and reliable operation of the power grid. Especially high-voltage transmission and distribution equipment is a major key equipment for power development, and also a major strategic equipment in the national energy strategy and equipment manufacturing industry. The power transmission and distribution equipment includes primary equipment and secondary equipment. Primary equipment mainly includes switches, transformers, reactors, capacitors, transformers, insulators, lightning arresters, DC transmission converter valves, and wires and cables, which are equipment used in the main power transmission system; Secondary equipment mainly refers to equipment for power equipment control and automatic control, protection, and measurement of the power grid, including relays, measuring instruments, signal equipment, control cables, etc. It is a device that plays a control and protection role on primary equipment.