How to solve the switching problem when the intelligent power capacitor is over zero?

At present, the traditional reactive power compensation method of capacitor on the market is to switch on and off with AC contactor. When switching on and off intelligent capacitor, it is easy to generate inrush current, which has impact on capacitor and power grid. When switching on and off capacitor, it is easy to cause the following results:

1. The capacitor is frequently impacted, the capacity is attenuated and the service life is reduced;

2. The fuse is broken down;

3. Damage of AC contactor.

Because of the large inrush current, the fuse is easy to be broken down, and some switches use miniature circuit breakers. Although it is convenient, there are hidden dangers: the breaking capacity of the miniature circuit breaker is only 4000A ~ 6000a. In case of phase to phase short circuit, the contacts will stick together, and the control circuit cannot be disconnected, and the protection function will be lost. In serious cases, it can lead to over tripping and expand the fault surface.

Solution:

Wolff intelligent low-voltage power capacitor adopts microelectronics technology. The CPU samples the sine wave of voltage and current. According to the change of power factor, when the reactive power needs to be increased, the capacitor is put into operation at the voltage zero crossing point; when the reactive power needs to be reduced, the capacitor is cut off at the current zero crossing point. "Zero crossing switching" technology reduces the surge current, and the above problems do not exist.