The designing, realization and testing of a network filter used to reduce electromagnetic disturbances and to improve the EMI for static switching equipment

The paper deals with the designing, realization and testing of a network filter used to reduce the electromagnetic disturbances produced by static switching equipment. The tests were done according to the CISPR 17 standard for the determination of the insertion loss for each cell, and the verifications concerning the filter's efficiency with respect to the conducted and radiated disturbances produced by a static switching equipment revealed the obeying of the CISPR 11 standard. One presents the experimental determinations made previous to network filter use. After the filter's designing and realization, experimental data relative to the conducted emissions were gathered. The assembling and case shielding were improved in order to obey the limits imposed to the radiated emissions according to the CISPR 11 standards, and consequent experimental determinations revealed significant improvements from the EMI point of view.