IEC/TR 60725-ed.3.0

Annotation of standard text IEC/TR 60725-ed.3.0 :

IEC;TR 60725:2012, which is a technical report, records the information that was available and the factors that were taken into account in arriving at the reference impedances that were incorporated in IEC 60555 and which are now incorporated in some parts of IEC 61000-3. In addition, information is given on the impedances of public supply networks associated with service current capacities =100 A per phase. The third edition includes brings two mainly significant technical changes with respect to the previous edition: - a new survey and other data from countries with public supply networks operating at 60 Hz have been included; and - recommendations that were applicable to 50 Hz systems are now mirrored by new recommendations that are relevant to 60 Hz systems. La CEI/TR 60725:2012 est un rapport technique qui comprend les informations disponibles et les facteurs pris en compte lors de letablissement des impedances de reference integrees dans la CEI 60555 et qui sont desormais integres dans certaines parties de la CEI 61000-3. De plus, les informations fournies concernent les impedances des reseaux publics dalimentation associes a des capacites utiles de courant <=100 A par phase. Cette troisieme edition apporte principalement deux modifications techniques majeures par rapport a ledition precedente: - une nouvelle enquete comparative et dautres donnees en provenance de pays ayant des reseaux de distribution publique fonctionnant a 60 Hz ont ete incluses; et - les recommandations qui etaient applicables aux systemes a 50 Hz sont maintenant completees par des recommandations equivalentes pour les systemes a 60 Hz.