In power supply networks with higher harmonics the proper power factor correction is not possible by means of conventional capacitor banks. When higher harmonics are present in the network system the resonances between network inductance (together with secondary side of feeding transformer) and capacitance of switched capacitor steps can occur. This results in harmonic amplitude increase, especially when its frequency equals the frequency of resonant system which causes damage to capacitor bank and other electronic systems working within this network.
In such situation power factor correction should be provided by means of automatic capacitor banks with blocking reactors. Each step of such bank consists of single capacitor and blocking reactor which together make a series resonant circuit tuned to the frequency lower than 5th harmonic. The step matched in such way has a capacitance characteristics at basic frequency (50 or 60Hz) and ensures proper power factor correction. At higher frequencies than its own resonant frequency the step has inductive characteristics. This type of bank absorbs from the network part of 5th harmonics (15-40%) and is automatically controlled with microprocessor power factor controller – similar to the standard capacitor bank (without reactor).


Examples of configurations of capacitor banks type BKD-95

Other configuration / dimensions available on request.

Technical data: