The Principle of Reactive Power Compensation

1. Power factor electricity charge
It refers to the situation where the reactive power consumption of inductive loads of power users is excessive, resulting in a power factor lower than the national standard.

2. Surge Current and Overvoltage
Surge current refers to the current generated instantaneously when a capacitor is put into service. If the zero-crossing point is not utilized when the contactor is engaged with the capacitor, the instant when the capacitor is engaged is equivalent to a short circuit, resulting in a current that is tens or hundreds of times larger than the rated current of the capacitor. At the same time, many weakly withstand-voltage plates of the capacitor will be broken down, causing the capacitor to be unable to store energy and affecting its service life. Therefore, contactor-type capacitor cabinets cannot be frequently switched on and off.
Overvoltage refers to the voltage generated instantaneously when the capacitor is removed. When the capacitor is removed, due to the superposition of the grid voltage and the terminal voltage of the capacitor, overvoltage is generated.