In case an electrical system is polluted by a certain level of harmonics but still not exceeding general harmonic regulation, can we increase the rated voltage of the capacitor in order to prolong its useful life?
Installing shunt capacitors in harmonic polluted systems causes harmonic resonance between the capacitors and the system. The resonance phenomenon amplifies the harmonic current which can damage the capacitors and also interferes with the system in many ways. Increasing the rated voltage of the capacitor unit allows the capacitor unit to work longer in harmonic polluted system depending on the level of harmonic and rated voltage level of the capacitor. However, it does not prevent the harmonic resonance problem. As a result, the capacitors may last a little longer but the amplified harmonics can still interfere with the system and destroy or reduce the life of other network components. Detuned capacitor banks are more appropriate than standard capacitor banks in case of presence of harmonics. These banks prevent harmonic interference to the system and prolong the capacitor lifetime.
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