IEC 60853-1 AMD 2-2008 Calculation of the cyclic and emergency current rating of cables - Part 1 Cyclic rating factor for cables up to and including 18 30 (36) .pdf

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1、 IEC 60853-1 Edition 1.0 2008-10 INTERNATIONAL STANDARD NORME INTERNATIONALE Calculation of the cyclic and emergency current rating of cables Part 1: Cyclic rating factor for cables up to and including 18/30 (36) kV Calcul des capacits de transport des cbles pour les rgimes de charge cycliques et de

2、 surcharge de secours Partie 1: Facteur de capacit de transport cyclique pour des cbles de tensions infrieures ou gales 18/30 (36) kV IEC 60853-1:1985/A2:2008 AMENDMENT 2 AMENDEMENT 2 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2008 IEC, Geneva, Switzerland All rights reserved. Unless otherwis

3、e specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, 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 questio

4、ns about IEC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. Droits de reproduction rservs. Sauf indication contraire, aucune partie de cette publication ne peut

5、tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie 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 ob

6、tenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI 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 Electrotech

7、nical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, 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

8、have the latest edition, a corrigenda or an amendment might have been published. Catalogue of IEC publications: www.iec.ch/searchpub 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, withdra

9、wn and replaced publications. IEC Just Published: www.iec.ch/online_news/justpub Stay up to date on all new IEC publications. 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 dictiona

10、ry of electronic and electrical terms containing more than 20 000 terms and definitions in English and French, with equivalent 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

11、us your feedback on this publication or need further assistance, please visit the Customer Service Centre FAQ or contact us: 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 l

12、abore et publie des normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. 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 corrigend

13、um ou amendement peut avoir t publi. Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm Le Catalogue en-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

14、 et les publications retires ou remplaces. Just Published CEI: www.iec.ch/online_news/justpub Restez inform sur les nouvelles 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.or

15、g Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 20 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International en ligne. Service Cl

16、ients: www.iec.ch/webstore/custserv/custserv_entry-f.htm Si vous dsirez nous donner des commentaires sur cette publication ou 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 60853-1 Edition 1.0 2008-10

17、INTERNATIONAL STANDARD NORME INTERNATIONALE Calculation of the cyclic and emergency current rating of cables Part 1: Cyclic rating factor for cables up to and including 18/30 (36) kV Calcul des capacits de transport des cbles pour les rgimes de charge cycliques et de surcharge de secours Partie 1: F

18、acteur de capacit de transport cyclique pour des cbles de tensions infrieures ou gales 18/30 (36) kV INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE D ICS 29.060.20 PRICE CODE CODE PRIX ISBN 2-8318-1013-3 AMENDMENT 2 AMENDEMENT 2 Registered trademark of the Inter

19、national Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60853-1 Amend. 2 IEC:2008 FOREWORD This amendment has been prepared by IEC technical committee 20: Electric cables. The text of this amendment is based on the following documents: FDIS Report on voti

20、ng 20/960/FDIS 20/990/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 publication will remain unchanged until the maintenance result dat

21、e 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. _ Introduction Replace the words “This standard” in the first paragraph by “This par

22、t of IEC 60853”. Replace the second paragraph by the following two new paragraphs: Part 2 of the IEC 60853 series provides manual methods for calculating cyclic rating factors for cables whose internal thermal capacitance cannot be neglected; in general this applies to cables for voltages greater th

23、an 18/30 (36) kV. It also gives a method for calculating the emergency rating for cables of any voltage as well as providing a means of calculating the temperature response of a cable to a current that changes in discrete multiple steps. Part 3 of the IEC 60853 series deals with cyclic rating factor

24、s for cables of all voltages when partial drying of the soil occurs. 1 Scope Delete, in the first paragraph, the last sentence beginning “Methods for dealing ”. 60853-1 Amend. 2 IEC:2008 3 2 Symbols Insert the following new symbol and definition: N = number of cables, or, for touching cables, the nu

25、mber of circuits, see 3.3 (ii) 3.1.2 Flat topped load cycle consisting of a sustained maximum current for at least 6 h and a constant fraction of that current for the rest of the cycle Delete, in the first line, the second mention of “the duration of”. 3.3 Group of circuits of three equally loaded,

26、identical, touching cables or ducts having equal losses Replace the existing text by the following new text: The methods are the same as those given in 3.2 above, except that i) The external thermal resistance 4 T , on which the value of 1 k is dependent, relates to = 630 , 0 4 In 5 , 1 e 4 D L T T

27、for metallic sheathed and part-metallic covered cables (where helically laid armour or screen wires cover from 20 % to 50 % of the cable circumference) or + = e e 4 2 In 2 4 In 2 1 D D L P T L Tfor non-metallic sheathed cables (it should be noted that this formula is under consideration) where T is

28、the soil thermal resistivity, in Km/W; L is the depth of laying, in metres; e D is the external diameter of cable or duct, in metres. ii) The symbols N, pk d and pk d used for the calculation of F i), ( and f d in Equations (10), (11) and (12) are defined as: N is the number of circuits (of three si

29、ngle-core cables per circuit) pk d is distance from the centre of circuit k to centre of circuit containing the hottest cable pk d is the distance of image of centre of circuit k to centre of circuit containing the hottest cable. iii) Additional external thermal resistance caused by heating from oth

30、er cables in a group is expressed by 2 ln 3 4 F T T = 4 60853-1 Amend. 2 IEC:2008 withF given by Item ii) above. iv) W is the total loss per unit length per single cable or duct. v) The value of the cable or duct diameter to be assumed for the calculation of ) (i is that of an isolated cable or duct

31、. 7 Examples Replace, in subclause 7.1, the existing equation for M by the following new equation: () () 5 , 0 605 , 0 504 , 0 328 , 0 7 , 0 992 , 0 7 , 0 1 1 + + = MSubclause 7.2 Table IV Values of iand 1-(6) for soil thermal diffusivity of 0.5 10 6m 2 /s Replace, in Table IV, the value of 0for a d

32、iameter of 0.100 m from 0.100 to 0.108. _ 6 60853-1 Amend. 2 CEI:2008 AVANT-PROPOS Le prsent amendement a t tabli par le Comit dtudes 20: Cbles lectriques. Le texte de cet amendement est issu des documents suivants: FDIS Rapport de vote 20/960/FDIS 20/990/RVD Le rapport de vote indiqu dans le tablea

33、u ci-dessus donne toute information sur 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 re

34、latives la publication recherche. A cette date, la publication sera reconduite, supprime, remplace par une dition rvise, ou amende. _ Introduction Remplacer les mots La prsente norme dans le premier alina, par La prsente partie de la CEI 60853. Remplacer le deuxime alina par les deux nouveaux alinas

35、 suivants: La Partie 2 de la srie CEI 60853 fournit des mthodes manuelles de calcul des facteurs de capacit de transport en rgime cyclique pour les cbles dont la capacit thermique interne ne peut pas tre nglige; en gnral, ceci concerne les cbles de tensions suprieures 18/30 (36) kV. Elle donne aussi

36、 une mthode de calcul des capacits de transport en surcharge de secours pour les cbles de toute tension, et fournit les lments permettant de dterminer la rponse en temprature dun cble soumis un courant qui varie par paliers successifs. La Partie 3 de la srie CEI 60853 traite des facteurs de capacit

37、de transport cyclique pour les cbles de tout niveau de tension en cas de desschement partiel du sol. 1 Domaine dapplication Supprimer, dans le premier alina, la dernire phrase qui commence par Des mthodes permettant 60853-1 Amend. 2 CEI:2008 7 2 Symboles Introduire le nouveau symbole et sa nouvelle

38、dfinition suivants: N = nombre de cbles, ou, pour des cbles jointifs, nombre de circuits, voir 3.3 (ii) 3.1.2 Cycle de charge plafonn une valeur constante, dont le courant est maintenu sa valeur maximale pendant au moins 6 h et une fraction constante de ce courant pendant le reste du cycle La correc

39、tion ne concerne que le texte anglais. 3.3 Groupe de circuits de trois cbles ou fourreaux identiques galement chargs, jointifs et ayant des pertes gales Remplacer le texte existant par ce qui suit: Les mthodes sont les mmes que celles donnes en 3.2 ci-dessus, except que i) La rsistance thermique ext

40、rieure T 4 , dont dpend la valeur de k 1 , est issue de = 630 , 0 4 In 5 , 1 e 4 D L T T pour les cbles gaine mtallique et les cbles recouverts partiellement dun revtement mtallique (armure pose hlicodalement ou fils dcran couvrant 20 % 50 % de la circonfrence du cble), ou + = e e 4 2 In 2 4 In 2 1

41、D D L P T L Tpour les cbles gaine non mtallique (il est noter que cette formule est ltude) o T est la rsistivit thermique du sol, en Km/W; L est la profondeur de pose, en mtres; e D est le diamtre extrieur du cble ou du fourreau, en mtres. ii) Les symboles N, pk d et pk d utiliser pour le calcul de

42、(i), F et f d dans les quations (10), (11) et (12) sont dfinis par: N est le nombre de circuits (avec trois cbles unipolaires par circuit); pk d est la distance du centre du circuit k au centre du circuit contenant le cble le plus chaud; pk d est la distance de limage du centre du circuit k au centr

43、e du circuit contenant le cble le plus chaud. iii) La rsistance thermique extrieure supplmentaire traduisant lchauffement d aux autres cbles dans un groupe sexprime par = 2 ln 3 4 F T To F est donn litem ii) ci-dessus. 8 60853-1 Amend. 2 CEI:2008 iv) W est la perte totale par unit de longueur dun se

44、ul cble ou dun fourreau unique. v) La valeur du diamtre du cble ou du fourreau faire intervenir dans le calcul de (i) est celle dun seul cble ou fourreau isol. 7 Exemples Remplacer, dans le paragraphe 7.1, lquation existante pour M par la nouvelle quation suivante: () () 5 , 0 605 , 0 504 , 0 328 ,

45、0 7 , 0 992 , 0 7 , 0 1 1 + + = MParagraphe 7.2 Tableau IV Valeurs de i , 1 (6) pour une diffusivit thermique du sol de 0.5 10 6m 2 /s Remplacer, dans le Tableau IV, la valeur de 0pour un diamtre de 0.100 m de 0.100 en 0.108. _ 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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