Power capacitors can be divided into eight types according to their use

① Shunt capacitor. Originally called phase-shifting capacitor. It is mainly used to compensate reactive power of rational load in power system to improve power factor, improve voltage quality and reduce line loss.

② Series capacitor. Series connected in power frequency high voltage transmission and distribution lines to compensate the distributed inductive reactance of the line, improve the static and dynamic stability of the system, improve the voltage quality of the line, lengthen the transmission interval and increase the transportation capacity.

③ Coupling capacitor. It is mainly used for high-frequency communication, measurement, control and maintenance of high-voltage power lines, as well as components in the equipment for extracting electric energy.

④ Circuit breaker capacitor. It was originally called equalizing capacitor. Parallel connection has a voltage equalizing effect on the fracture of EHV circuit breaker, which makes the voltage between each fracture even during and during breaking, improves the arc extinguishing characteristics of circuit breaker, and improves the breaking ability. ⑤ Electric heating capacitor. It is used in the electric heating equipment system with the frequency of 40 ~ 24000 Hz to improve the power factor and the voltage or frequency characteristics of the circuit.

⑥ Pulse capacitor. It can be used as impulse voltage generator, impulse current generator and oscillation circuit for circuit breaker experiment.

⑦ DC and filter capacitors. It is used in high voltage direct current equipment and high voltage rectifying and filtering equipment.

⑧ Standard capacitor. Used in power frequency high voltage measuring dielectric loss circuit, as standard capacitor or capacitance voltage divider for measuring high voltage

In the power system, there are high voltage power capacitor (above 6kV) and low voltage power capacitor (400V)

Low voltage power capacitor is divided into oil impregnated paper power capacitor and self-healing power capacitor according to its nature, and general power capacitor and intelligent power capacitor according to its function. The general power capacitor is not repeated, but the intelligent power capacitor is mainly introduced.