EMC Filter

EMC filters are used to suppress conducted interference. Their propagation is prevented by a maximum impedance mismatch, with the filtering effect extending in both directions. This means that interference from the consumer to the grid, as well as from the grid to the consumer, is attenuated.

REO single-phase mains filters achieve maximum attenuation thanks to powerful Chokes. The single-phase mains filters are available as single-stage or two-stage filters, thus ensuring compliance with EMC directives based on the limit values for your application. Three-phase mains filters filter disturbances according to EN 55011 and EN 618003.

REO DC FILTERS are used to prevent power-related interference in DC circuits. Due to increasingly efficient energy conversion in modern inverters, more and more high-frequency energies are introduced into DC circuits. These are caused by the fast switching operations of modern power semiconductors and can lead to premature aging, for example, of solar modules.
REO harmonic filters or passive filters are used to reduce THD (Total Harmonic Distortion). 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 wave filters enable a sinusoidal output voltage for frequency converters.

REO du/dt filters, due to their design, attenuate the voltage rise to tolerable values. For 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 interference suppression in high-current applications in wind turbines and industrial applications. The filter series are available for voltage levels of 480V and 690V. REO high-current filters can be supplied in various housing variants and thus adapted to different environmental conditions. In a stainless steel housing, these filters are ideally suited for offshore applications thanks to their increased salt spray resistance.

REO’s filter combination combines a three-phase line choke and an EMC filter. This combination minimizes EMC problems and harmonics and reduces energy costs by up to 20%. The line choke is responsible for relieving the power supply network by compensating for harmonic reactive power. This significantly reduces harmonic currents and commutation notches. The use of the three-phase line filter suppresses interference pulses and surge voltages according to EN 55011 and EN 618003.