Detuned Harmonic Filter Reactors

Harmonics generating Non-Linear loads such as Arc Furnaces, Induction Furnaces, Arc welding equipment, variable frequency drives, UPS, battery chargers, computers etc., are rapidly increasing.

Impedance of the Capacitors decreases drastically for higher harmonic currents, presenting the shortest path for them. The effect of non-linear and time varying loads can be further amplified by resonance conditions, which will cause distortion of supply voltage in the network. These harmonic currents added to the fundamental current produces dangerous overloads on the capacitors, leading to premature failure.

Application of DHANDAPANI Detuned Harmonic Filters

Detuned Filters, essentially consisting of a Reactor connected in series with a Capacitor in each phase in power factor correction installation helps to prevent harmonic resonance problems effectively by reducing the resonant frequency below the frequency of harmonic currents. This detuned filter presents an inductive load for the network avoiding resonance.



Reactors for detuned filters are specified by p% factor called the detuning factor.The tuning frequency is usually set at a value between the fundamental frequency and the frequency of the lowest order harmonic present, which is usually the 5th harmonic.

Dhandapani offers a standard range of Reactors from 5 to 100 kVAr with p=7%,meaninga resonant frequency of 189 Hz for 50 Hz network. This will avoid resonance to 5th harmonic and above.