NEPSI's Metal-Enclosed Harmonic Filter Banks typically come equipped with single-phase Iron-Core harmonic filter reactors. They are tuned as required for the application. In most applications, the reactors tune the capacitor bank to a frequency near the 5th harmonic (i.e. 270 hertz). In systems with large harmonic producing devices, the reactors may tune the capacitor bank to a number of different frequencies between the 2nd and the 25th harmonic.

• The reactor core will not saturate for currents less than 250% of the fundamental current rating of the reactor.
• Peak flux density of the core shall be less than 1.2 - 1.4 Tesla assuming all harmonic current peaks are 100% coincident (Core design is not based on RMS current rating of reactor)
• When specific harmonic current data and system impedance data are provided, the reactor current spectrum will be based upon computer simulations and an engineering margin.