IEC 60949 AMD 1-2008 Calculation of thermally permissible short-circuit currents taking into account non-adiabatic heating effects Amendment 1《考虑非绝热加热效应的热容许短路电流的计算.修改件1 n》.pdf

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1、 IEC 60949 Edition 1.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects Calcul des courants de court-circuit admissibles au plan thermique, tenant compte des effets dun chauffement non a

2、diabatique IEC 60949:1988/A1:2008 AMENDMENT 1 AMENDEMENT 1 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,

3、 including photocopying and microfilm, without permission in writing from either IEC or IECs member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address b

4、elow or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie

5、 et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la C

6、EI de votre pays de rsidence. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.ch Web: www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electri

7、cal, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/se

8、archpub The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, withdrawn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications.

9、 Just Published details twice a month all new publications released. Available on-line and also by email. Electropedia: www.electropedia.org The worlds leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalen

10、t terms in additional languages. Also known as the International Electrotechnical Vocabulary online. Customer Service Centre: www.iec.ch/webstore/custserv If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us:

11、Email: csciec.ch Tel.: +41 22 919 02 11 Fax: +41 22 919 03 00 A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes.

12、A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en

13、-ligne de la CEI vous permet deffectuer des recherches en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Il donne aussi des informations sur les projets et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles

14、 publications de la CEI. Just Published dtaille deux fois par mois les nouvelles publications parues. Disponible en-ligne et aussi par email. Electropedia: www.electropedia.org Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000 termes et dfinit

15、ions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Clients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou

16、 si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60949 Edition 1.0 2008-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Calculation of thermally permissible short-circuit currents, taking into account no

17、n-adiabatic heating effects Calcul des courants de court-circuit admissibles au plan thermique, tenant compte des effets dun chauffement non adiabatique INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE C ICS 29.060.20; 29.020 PRICE CODE CODE PRIX ISBN 2-8318-1000-

18、9 AMENDMENT 1 AMENDEMENT 1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60949 Amend. 1 IEC:2008 FOREWORD This amendment has been prepared by IEC technical committee 20:Electric cables. The text of this amendment

19、 is based on the following documents: FDIS Report on voting 20/950/FDIS 20/973/RVD Full information on the voting for the approval of this amendment can be found in the report on voting indicated in the above table. The committee has decided that the contents of this amendment and the base publicati

20、on will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition, or amended. _ Page 5 Replace the two IE

21、C publications cited at the bottom of the page by the following: IEC 60228, Conductors of insulated cables IEC 60287-1-1, Electric cables Calculation of the current rating Part 1-1: Current rating equations (100 % load factor) and calculation of losses General IEC 60287-2-2, Electric cables Calculat

22、ion of the current rating Part 2: Thermal resistance Section 2: A method for calculating reduction factors for groups of cables in free air, protected from solar radiation Page 11 4 Calculation of short-circuit temperature Add the following new paragraph at the end of Clause 4: Where there are a num

23、ber of components within the cable that are connected in parallel, e.g. screen/sheath/armour, such that they will share the fault current, it is sufficiently accurate to consider that the ratio between the currents in any two components is equal to the inverse ratio of their respective resistance. E

24、ach component is expected to achieve a different temperature. Because the materials adjacent to each component may be different, the 60949 Amend. 1 IEC:2008 3 maximum permitted temperature for each component may be different. The initial temperature for each component shall be calculated using the e

25、quations set out in IEC 60287-2-1 1 . Page 11 5.1 General In the definition of c , replace (J/NK.m 3 ) by (J/K.m 3 ). Page 17 Table I In note 2)under Table I, replace IEC 287 (Table I) by IEC 60287-1-1. Table II Insert, after Rubber (natural), the following new values: Paper insulation in cables wit

26、h internal gas pressure: a) pre-impregnated b) mass-impregnated 6,5 6,0 2,0 10 6 2,0 10 6 In note 1)under Table II, replace IEC 287 (Table IV) by IEC 60287-2-1. _ _ 1IEC 60287-2-1, Electric cables Calculation of the current rating Part 2-1: Thermal resistance Calculation of thermal resistance. 4 609

27、49 Amend. 1 CEI:2008 AVANT-PROPOS Le prsent amendement a t tabli par le comit dtudes 20 de la CEI: Cbles lectriques. Le texte de cet amendement est issu des documents suivants: FDIS Rapport de vote 20/950/FDIS 20/973/RVD Le rapport de vote indiqu dans le tableau ci-dessus donne toute information sur

28、 le vote ayant abouti lapprobation de cet amendement. Le comit a dcid que le contenu de cet amendement et de la publication de base ne sera pas modifi avant la date de maintenance indique sur le site web de la CEI sous “http:/webstore.iec.ch“ dans les donnes relatives la publication recherche. A cet

29、te date, la publication sera reconduite; supprime; remplace par une dition rvise, ou amende. _ Page 4 Remplacer les deux publications CEI cites en bas de la page par les suivantes: CEI 60228, Ames des cbles isols CEI 60287-1-1, Cbles lectriques Calcul du courant admissible Partie 1-1: Equations de l

30、intensit du courant admissible (facteur de charge 100 %) et calcul des pertes Gnralits CEI 60287-2-2, Cbles lectriques Calcul du courant admissible Partie 2: Rsistance thermique Section 2: Mthode de calcul des coefficients de rduction de lintensit de courant admissible pour des groupes de cbles poss

31、 lair libre et protgs du rayonnement solaire direct Page 10 4 Calcul de la temprature de court-circuit Ajouter le nouvel alina suivant la fin de lArticle 4: Lorsque le cble comporte un certain nombre de constituants connects en parallle, par exemple lcran/ la gaine/ larmure, de sorte quils se partag

32、ent le courant de dfaut, il est suffisamment prcis de considrer que le rapport des courants entre deux des constituants quelconques est gal linverse du rapport de leur rsistance respective. On sattend ce que chaque constituant atteigne une temprature diffrente. Comme les matriaux adjacents chacun de

33、s composants peuvent tre diffrents, les tempratures maximales admissibles 60949 Amend. 1 CEI:2008 5 par les composants peuvent tre diffrentes. La temprature initiale de chaque constituant doit tre calcule laide des quations donnes dans la CEI 60287-2-1 1 . Page 10 5.1 Gnralits La correction ne conce

34、rne que le texte anglais. Page 16 Tableau I Dans la Note 2)en-dessous du Tableau I remplacer CEI 287 (Tableau I) par CEI 60287-1-1 Tableau II Insrer aprs Caoutchouc naturel, les nouvelles valeurs suivantes: Isolation en papier dans les cbles pression interne de gaz: a) pr-imprgns b) imprgns en masse

35、 6,5 6,0 2,0 10 6 2,0 10 6 Dans la Note 1)sous le Tableau II remplacer CEI 287 (Tableau IV) par CEI 60287-2-1 _ _ 1CEI 60287-2-1, Cbles lectriques Calcul du courant admissible Partie 2-1 : Rsistance thermique Calcul de la rsistance thermique INTERNATIONAL ELECTROTECHNICAL COMMISSION 3, rue de Varemb PO Box 131 CH-1211 Geneva 20 Switzerland Tel: + 41 22 919 02 11 Fax: + 41 22 919 03 00 infoiec.ch www.iec.ch

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