cern arising from the use of capacitors in power systems is the possibility of the system resonance.This effect leads to harmonic voltages and currents that are considerably higher than they would be in the case without resonance.Р2.6.1 Harmonics and Parallel ResonanceРHarmonic currents produced for example by variable speed drives can be amplified up to 10-15 times in parallel resonance circuit formed by the capacitance of the capacitor bank and work inductance.РAmplified harmonic currents through the capacitors can lead to internal over heating of the capacitor unit.Please note that currents having higher frequency than fundamental frequency cause more losses than 50Hz current having same amplitude.An example of parallel resonance circuit with its equivalent circuit is shown in figure 8.
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