Reactive Power Compensation Switching Method

The delayed switching method is commonly known as the "static" compensation method. The purpose of delayed switching is to prevent too frequent actions from causing damage to capacitors, and more importantly, to prevent the continuous switching of capacitors from causing oscillation in the power supply system, which is very dangerous.
The delayed switching method is used to control the switching of capacitors, which can be a dedicated contactor for switching capacitors, a composite switch, or a synchronous switch (also known as a phase selector switch).
The dedicated contactor for switching capacitors has a set of auxiliary contacts connected in series with resistors and connected in parallel with the main contacts. During the input process, the auxiliary contact is closed first, and the resistor connected in series with the auxiliary contact pre charges the capacitor. Then, the main contact is closed again, thus limiting the surge current when the capacitor is input.