The transmission line is achieved by using a transformer to boost the electrical energy emitted by the generator, and then connecting it to the transmission line through control devices such as circuit breakers. The structural form of transmission lines is divided into overhead transmission lines and cable lines. The overhead transmission line is composed of line towers, wires, insulators, line hardware, stay wires, tower foundations, grounding devices, etc., and is erected above the ground. According to the nature of the transmitted current, transmission is divided into AC transmission and DC transmission. In the 1880s, direct current transmission was first successfully achieved. However, due to the difficulty in continuously increasing the voltage of DC transmission under the technical conditions at that time, the transmission capacity and efficiency were limited. At the end of the 19th century, direct current transmission was gradually replaced by alternating current transmission. The success of AC transmission ushered in a new era of electrified society in the 20th century. Widely used for three-phase AC transmission, with a frequency of 50 Hz (or 60 Hz). Since the 1960s, there have been new developments in direct current transmission, which, in conjunction with alternating current transmission, forms a hybrid power system of alternating current and direct current. According to the nature of the transmitted current, transmission is divided into AC transmission and DC transmission. In the 1880s, direct current transmission was first successfully achieved. However, due to the difficulty in continuously increasing the voltage of DC transmission under the technical conditions at that time, the transmission capacity and efficiency were limited. At the end of the 19th century, direct current transmission was gradually replaced by alternating current transmission. The success of AC transmission ushered in a new era of electrified society in the 20th century. Since the 1960s, there have been new developments in DC transmission, which, in conjunction with AC transmission, forms a hybrid AC DC power system
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