Harmonic and EMI filters

Non linear loads, such as: rectifiers, inverters, speed variators, furnaces,  etc. that absorb periodic non-sine wave currents from the network. Said currents are composed of a fundamental frequency component rated at 50 or 60 Hz, plus a series of overlapping currents, with frequencies that are multiples of the fundamental frequency. This is how we define HARMONICS.The result is a deformation of the current (and, as a consequence, voltage) that has a series of associated secondary effects.