Power capacitors are divided into series capacitors and parallel capacitors, which both improve the voltage quality of the power system and enhance the transmission capacity of transmission lines. They are equipment of the power system. The function of a series capacitor: A series capacitor is connected in series in a line, and its function is as follows: (1) to increase the voltage at the end of the line. The capacitor connected in series in the line compensates for the inductive reactance xl of the line, reducing the voltage drop of the line, thereby increasing the voltage at the end of the line (receiving end). The maximum voltage at the end of the line can be increased by 10% to 20%.