1、IS O1 Interpretation of subclause 19.8 IEC 61558-1:1997,First edition Safety of power transformers,power supply units and similar-Part 1:General requirements and tests INTERPRETATION SHEET In trod u ction:WGI of TC96 has been requested to provide urgently a clarification of the bridge allowed by res
2、istors or capacitors between different conductive parts.A clarification of subclause 19.8 of IEC 61558-1 Ed.1 has been agreed by WGI of TC96 as follows:“19.8 Conductive parts separated by double or reinforced insulation,e.g.live parts and the body or primary and secondary circuits,may be bridged(con
3、ductive bridge)by resistors or Y2 capacitors provided that they consist of at least two separate components whose impedance is unlikely to change significantly during the lifetime of the transformer.If the resistors are used they shall comply with the requirements of test(a)in 14.1 of IEC 60065.If c
4、apacitors are used they shall comply with the relevant requirements of I EC 60384-1 4.Where two capacitors are used in series,they shall each be rated for the total working voltage across the pair and shall have the same nominal capacitance value.If any one of such two components is short-circuited
5、or open-circuited,the values specified in Clause 9 shall not be exceeded.In addition,if the working voltage does not exceed 250 V,conductive parts separated by double or reinforced insulation,e.g.live parts and the body or primary and secondary circuits,may be bridged by a single Y1 capacitor comply
6、ing with the relevant requirements of I EC 60384-1 4.NOTE A Y1 capacitor is considered to have reinforced insulation.Compliance is checked by inspection and by measurement.”REMARKS-This interpretation of subclause 19.8 is not applicable to the transformer for toys covered by IEC 61558-2-7.-This clar
7、ification having been introduced in the draft IEC 61558-1,Second edition,this interpretation sheet will be automatically cancelled at the date of publication of IEC 61558-1 Ed.2.Decem ber 2003 ICs 29.180 Copyright International Electrotechnical Commission Provided by IHS under license with IECDocume
8、nt provided by IHS Licensee=Agip KOC/5950653001,02/25/2004 06:45:51 MSTQuestions or comments about this message:please call the Document Policy Groupat 303-397-2295.-,-,-NORME CE1 I N T E R N AT I O N AL E I N T E R N AT I O N AL STANDARD IEC 61 5584 Edition 1.1 1998-07 Edition 1:I 997 consolide par
9、 lamendement 1:I998 Edition 1:I 997 consolidated with amendment 1:I 998 PUBLICATION GROUPE DE SCURIT GROUP SAFETY PUBLICATION Scurit des transformateurs,blocs dalimentation et analogues-Partie 1:Rgles gnrales et essais Safety of power transformers,power supply units and similar-Part 1:General requir
10、ements and tests Numro de rfrence Reference number CEI/IEC 61558-1:I 997+A1:I998 Copyright International Electrotechnical Commission Provided by IHS under license with IECDocument provided by IHS Licensee=Agip KOC/5950653001,02/25/2004 06:45:51 MSTQuestions or comments about this message:please call
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