EMC Filter

EMC Filters are used to suppress line-bound interference. The propagation is prevented by a maximum impedance mismatch, whereby the filtering effect extends in both directions. This means that interference from the consumer to the grid is dampened, as well as from the grid to the consumer.

REO single-phase mains filters achieve maximum attenuation thanks to powerful Chokes. These single-phase mains filters are available as single-stage or two-stage filters, enabling compliance with EMC directives according to the limit values in your application. Three-phase mains filters filter interference in accordance with EN 55011 and EN 618003.

REO DC FILTERS are used to avoid power-related interference in the DC circuit. Due to the increasingly efficient energy conversion in modern inverters, more and more high-frequency energies are introduced into the DC circuits. These are caused by the fast switching operations of modern power semiconductors and can lead to premature aging of, for example, solar modules.
REO harmonic filters or passive filters are used to reduce the THD (Total Harmonic Distortion). The harmonic currents are suppressed so strongly that a THD of less than 5% is achieved (e.g. in UPS systems). Furthermore, a harmonic filter (e.g. REOWAVEpassive) reduces reactive power and saves up to 30% energy. REO sine filters enable a sinusoidal output voltage for frequency converters.

REO du/dt filters dampen the voltage increase to tolerable values due to their design. With short cable lengths between the frequency converter and the motor, a du/dt filter limits the rate of rise and is the ideal link between the frequency converter and the motor. The REO high-current filter is specially designed for the suppression of high-current applications in wind turbines and industrial applications. The filter series are available for the voltage levels 480V and 690V. REO high-current filters can be supplied in various housing variants and thus adapted to the different environmental conditions. In the stainless steel housing, these filters are ideal for offshore applications thanks to their increased resistance to salt spray.

With the REO filter combination, a three-phase mains choke and an EMC filter are combined. This combination minimizes EMC problems as well as harmonics and reduces energy costs by up to 20%. The mains choke is responsible for relieving the supply network by compensating the harmonic reactive power. As a result, the harmonic overtones and the commutation dips are greatly reduced. By using the three-phase mains filter, interference pulses and surge voltages are suppressed according to EN 55011 and EN 618003.