Electromagnetic interference at the mains ports of an equipment

Abstract

Distribution  line  hardware  can  generate  radio-frequency  interference  (RFI).  Such  interference  can  impact  the  AM and FM bands as well as VHF television broadcasts. The  paper  presents  a  reversed  electromagnetic  interference  problem,  due  to  the  proximity  of  two  AM  radio  broadcasting  stations  which  injected  especially  common  mode  conducted  emissions  over  the  maximal  limits  specified  by  the  national  regulations in the public overhead low voltage mains network. These emissions determined the malfunction of the gas heating centrals  Themaclassic  Saunier  Duval  installed  in  the  area.  The  problem  was  solved  by  the  retro  fitting  of  an  extra  EMI  filter  for the mains network, as presented in the paper.