The power system is a power production and consumption system composed of power generation, transmission, distribution, sales and use of electricity. Among them, the power industry covers four aspects: power generation, transmission, distribution and power supply. The power industry is a basic industrial industry that converts various types of primary energy into electricity through the corresponding power generation equipment, and then transmits power from the power plant to the end-user through the transmission and distribution network, providing end-users with power with power with different voltage levels and different reliability standards and other power auxiliary services.