IEC 62475-ed.2.0

Annotation of standard text IEC 62475-ed.2.0 :

IEC 62475:2026 is applicable to high-current testing and measurements on both high-voltage and low-voltage equipment. It deals with steady-state and short-time direct current (as e.g. encountered in high-power DC testing), steady-state and short-time alternating current (as e.g. encountered in high-power AC testing), and impulse-current. In general, currents above 100 A are considered in this International Standard, although currents less than this can occur in tests. This standard: • defines the terms used; • defines parameters and their tolerances; • describes methods to estimate uncertainties of high-current measurements; • states the requirements applicable to a complete measuring system; • describes the methods for approving a measuring system and checking its components; • describes the procedure by which the user shows that a measuring system meets the requirements of this document, including limits set for uncertainty of measurement. This standard also covers fault detection during, for example, lightning impulse testing. This second edition cancels and replaces the first edition published in 2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: • minor errors in edition 1 have corrected; • terms and definitions have been modified to achieve best possible adherence to IEC 60060-2:2025 and have been ascribed appropriate [SOURCE]; • terms and definitions which in edition 1 were presented in clauses other than Clause 3 have been moved into Clause 3. • Annex B, Clause B.4 has been amended to provide an example of uncertainty calculation for the use of an approved measuring system; • Clause C.2 has been deleted since the definitions given there are not referred to, with the exception of the origin of the step, which is used in Annex D. The applicable information has been added to Annex D as Note 1. • Annex G, Clause G.8 has been amended to replace “peak factor” by “a factor”. Texts have been clarified. Equations for relation between factor ? and cos ? have been developed to a simplified form. • Annex G, Clause G.9 has been added. LIEC 62475:2026 sapplique aux essais et mesures a haute intensite sur des materiels haute et basse tensions. Il couvre les essais a haute intensite en courant continu et courant alternatif en regime etabli et de courte duree, ainsi que des essais de courant de choc. De maniere generale, le present document prend en compte des courants de plus de 100 A, meme si des courantes dintensite moindre peuvent etre rencontres lors des essais. La presente norme: • definit les termes utilises; • definit les parametres et leurs tolerances; • decrit des methodes destimation des incertitudes de mesures a haute intensite; • determine les exigences applicables a un systeme de mesure complet; • decrit les methodes a utiliser pour qualifier un systeme de mesure et pour en controler les differents constituants; • decrit la procedure permettant a lutilisateur de demontrer quun systeme de mesure respecte les exigences du present document, y compris les limites etablies pour lincertitude de mesure. La presente norme couvre egalement la detection de defauts, par exemple dans le cadre dessais aux chocs de foudre. Cette deuxieme edition annule et remplace la premiere edition parue en 2010. Cette edition constitue une revision technique. Cette edition inclut les modifications techniques majeures suivantes par rapport a ledition precedente: • des erreurs mineures dans ledition 1 ont ete corrigees; • les termes et definitions ont ete modifies afin de refleter au mieux lIEC 60060-2:2025 et la [SOURCE] correspondante leur a ete attribuee; • les termes et definitions qui, dans ledition 1, figuraient dans dautres articles que lArticle 3 ont ete deplaces a lArticle 3; • lArticle B.4 de lAnnexe B a ete modifie pour fournir un exemple de calcul de lincertitude pour lutilisation dun systeme de mesure approuve; • lArticle C.2 a ete supprime, car les definitions qui y figuraient ne sont pas mentionnees, a lexception de lorigine de lechelon, qui est utilisee a lAnnexe D; les informations applicables ont ete ajoutees a lAnnexe D sous la Note 1; • lArticle G.8 de lAnnexe G a ete modifie pour remplacer "le facteur de crete" par "un facteur". Les textes ont ete clarifies. Les equations relatives a la relation entre le facteur ? et cos ? ont ete developpees sous une forme simplifiee; • lArticle G.9 a ete ajoute a lAnnexe G.