Classification of power capacitors

Power capacitors can be divided into indoor type and outdoor type according to the installation method; the rated voltage according to their operation can be divided into two types: low pressure and high voltage; according to their phase number, they can be divided into single phase and three phase, except low voltage parallel. Outside the capacitor, the rest are single-phase; according to the shell material can be divided into metal shell, porcelain insulating shell, bakelite cylinder shell and so on.

According to the purpose, it can be divided into the following 8 types:

1. Parallel capacitors. Originally called phase shift capacitor. Mainly used to compensate reactive power of inductive load of power system to improve power factor, improve voltage quality and reduce line loss;

2. Series capacitors. It is connected in series with power frequency high-voltage transmission and distribution lines to compensate the distribution inductance of the line, improve the static and dynamic stability of the system, improve the voltage quality of the line, lengthen the transmission distance and increase the transmission capacity;

3. Coupling capacitors. Mainly used for high-frequency communication, measurement, control, protection of high-voltage power lines and components used in devices for extracting electric energy;

4. Circuit breaker capacitors. Originally known as equalizing capacitors. Parallel connection on the fracture of the ultra-high voltage circuit breaker, so that the voltage between the fractures is uniform during the breaking process and disconnection, and the arc-extinguishing characteristics of the circuit breaker can be improved and the breaking capacity can be improved;

5. Electric heating capacitors. It is used in electric heating equipment systems with a frequency of 40~24000 Hz to improve the power factor and improve the voltage or frequency of the circuit.

6. Pulse capacitors. It mainly functions as a storage energy, and is used as a basic energy storage component such as a surge voltage generator, an inrush current generator, and an oscillation circuit for circuit breaker test;

7. DC and filter capacitors. Used in high voltage DC devices and high voltage rectifier filter devices;

8. Standard capacitors. It is used in the power frequency high voltage measurement dielectric loss circuit as a standard capacitor or as a capacitor voltage divider for measuring high voltage.