COPPER WOUND DETUNED HARMONIC FILTER REACTOR

Detuned Filters, essentially consisting of a Reactor connected in series with Capacitors 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% factors called the detuned factors, which is the ration of voltages across reactor, and the capacitor expressed as a percentage. The detuned factor indicates the series resonance frequency of the LC branch. 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 standard range of Reactors with p=7% meaning resonant frequency of 189 Hz for 50 Hz network. This will avoid resonance to 5th harmonic and above.

Construction
The Reactors for Detuned Harmonic Filter are magnetically shielded, split cored, air cooled, varnish impregnated.

The core is made up of Electrical grade silicon steel laminations having permeability and grain oriented. The core assembly consists of split air gaps, which avoids core saturation.

The Coils are made up of superior grade Enameled Copper wire/Strips impregnated with excellent varnish with Class 'H' insulation.

The Input/Output connections are made by high conductivity Copper up to termination at the top & bottom for rating 15kVAr/Output terminals are connected to a terminal block suitable for cable connection.

Advantages of using Dhandapani Detuned Harmonic Filters

1. Designed to withstand 35% overload current than what is expected to flow normally.
2. Low core losses.
3. Operates at reasonably low current density hence low temperature rise, enabling cool running.
4. Overloading & premature failure of Capacitors due to harmonic is avoided.
5. Amplification of harmonics is avoided, which in turn: