How to choose series of capacitors for PF correction?

Considering power capacitor with rated power of 20 kvar and rated voltage of 440V supplied by mains at Un=400V. This type of calculation is true, if there is no reactor connected in series with capacitor. Once we know the total reactive power of the capacitors, we can choose series of capacitors for PF correction.

What is reactive power compensation panel?

Excellent. The aim of project called „Reactive power compensation panel” was to design capacitor bank with rated power of 200kVar and rated voltage of 400V adapted for operation with mains, where higher order harmonics are present. The capacitor bank was to be power capacitor based with automatic control by power factor regulator.

What is the detuning factor of a capacitor bank?

Since the detuning factor for the project was given as p=7%, one knows that the capacitor bank needs to be equipped with reactors. For this reason, some calculations have to be performed, in order to fit the power of the capacitors and its rated voltage taking into account reactive power of a detuning reactors.

What is a capacitor bank?

The capacitor bank was to be power capacitor based with automatic control by power factor regulator. This type of device was chosen as a compensator, because of its price compared i.e. to active filters.

What are the different types of reactive power compensation?

Capacitors can be connected at different points in the network to improve the power factor of one or more loads, by which we differentiate three types of reactive power compensation: central, group, and individual.

How to select a contactor for a capacitor?

In order to select proper contactor for each capacitor, one needs to pay attention for the rated power that can be handled by the device at given rated voltage. Therefore, for the project, where there are capacitors of rated power of 20kvar and 40kvar, following contactors were selected: MC – 32 and MC – 50.