scope:

This Technical Report is based on two Study Reports of CLC/SC205A, having been worked out by their Task Force EMI [1a][1b] andprovides the results and findings of these documents. It wascreated with the help and input from a broad range of involvedstakeholders: network operators, equipment manufacturers,universities, accredited test houses and consultants. Beside theactual standardization situation it reflects the current emissionsituation found in supply networks and installations and describeselectromagnetic interference (EMI) cases from twelve countries;investigation and analysis of the latter show a wide range ofdifferent types of electrical devices to be considered as a sourceor a victim of related EMI. This Technical Report highlights theoccurrence of high levels of non-intentional emissions (NIE) in theconsidered frequency range, including values up to and exceedingthe standardized limits for intentional signals from mainscommunicating systems (MCS), which also implies a high potential tocause EMI to other electrical equipment. On the other hand, severaltypes of equipment show susceptibility to related emissions, beinginsufficiently immune. The Technical Report addresses the followingissues: - a number of different types of electrical equipment aregenerating such emissions and/or are susceptible, to such, thusrepresenting EMI potential, as a source or a victim of such EMI; -the interaction of electrical equipment in a certain supply arearespectively installation, with its complex and volatile impedancecharacter, as having an additional EMI potential; that besides NIEfrom general electrical equipment and signals from MCS andtechnically being quite different from emissions; - the fact thatbesides the conducted interference also radiated interference fromNIE or signals from MCS, through the magnetic H-field following torelated currents on the mains, is to be considered, what is of someimportance also for the interference-free operation of broadcasttime-signal systems or electronic circuits controlled by such; -the ageing of electronic components in electric equipment, whichcauses increased emissions and EMI to other electrical equipment asa result of not showing the same EMC characteristics as beforebeing placed on the market, therefore no longer being able toconform with EMC requirements; - the additional aspect ofdifferential mode operation, which should be considered for relatedimmunity and testing specifications. These findings confirm thatEMI in this frequency range is not limited to single types ofequipment like inverters or MCS; instead a more generalelectromagnetic compatibility (EMC) problem concerning a largerspectrum of electrical equipment is identified. Although acase-by-case mitigation of related EMI cases might be seen asappropriate, the increasing application of technologies and systemswith related EMI potential requires a more general solution,through standardization, taking a balanced viewpoint of EMC andeconomics into account. With regard to the actual standardizationsituation, a review of the actual EMC and Product standards basedon the reported results seems to be advisable. After initiating thework in CLC/SC 205A, the now ongoing work in IEC SC 77A, as well asthe publication of a related Technical Report on testingelectricity meters [2] by CLC/TC 13 and of the new Immunity testingstandard EN 61000-4-19 [99], appear as right steps into the rightdirection but needing further, extended efforts. As stated onEuropean as well as on international EMC standardization level, theavailability of compatibility levels for the considered frequencyrange appears as a key-requirement for future considerations onsetting related emission limits and immunity requirements invarious standards. A fundamental basis for the coexistence ofintentional signals from MCS and NIE needs to be found.