The framework of a substation can mainly be classified into: hub substations and terminal substations. Step-up substation, step-down substation; Substations in power systems, industrial and mining substations, and railway substations (substations of voltage levels; 10KV substation Box-type substation. By leveraging advanced computer technology, modern electronic technology, communication technology and information processing technology, the functions of secondary equipment in substations (including relay protection, control, measurement, signal, fault recording, automatic devices and telecontrol devices, etc.) can be recombined and optimized for design. A comprehensive automated system that monitors, measures, controls and coordinates the operation of all equipment in a substation. In the power industry, power transmission and transformation within the range of 35kV to 1000kV is generally referred to as power transmission and transformation, while those within 10kV and below are called distribution networks. Power transmission and transformation can be simply divided into two primary parts :1. Transmission lines. 2. Substation. Generally, the voltage generated from power plants is relatively low. If it is not stepped up, the current on the line will be relatively large according to the share of alternating current UI. This is because the heat generated by the line is related to resistance and current. The greater the current, the more heat is produced relative to the same wire. As a result, most of the electricity generated by the power plant will be lost on the wire. The higher the heat of the wire, the greater the damage to it. To avoid the above-mentioned adverse effects. The measure is to increase the voltage and reduce the current. So a step-up substation is needed. Generally, the electricity coming out of a power plant passes through a step-up substation (low-voltage input and high-voltage output). Substations typically have step-up substations and step-down substations. The voltage levels, from low to high, are generally :35kV, 110kV, 220kV, 500kV, and 1000kV. It is a part of the power system, whose function is to change voltage levels and aggregate and distribute electrical energy. It mainly includes transformers, busbars, line switchgear, buildings and facilities required for the safety and control of the power system. Substations are generally classified by voltage levels to determine the scale they can serve. The higher the voltage level of a substation, the larger the radius it can serve. 500kV substations are now quite common. The power system is now relatively developed.