1、 IEC 60986Edition 2.1 2008-11INTERNATIONAL STANDARD NORME INTERNATIONALEShort-circuit temperature limits of electric cables with rated voltages from 6 kV (Um= 7,2 kV) up to 30 kV (Um= 36 kV) Limites de temprature de court-circuit des cbles lectriques de tensions assignes de 6 kV (Um= 7,2 kV) 30 kV (
2、Um= 36 kV) IEC60986:2000+A1:2008 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, including photocopying an
3、d 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 below or your local IEC mem
4、ber 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 et les microfilms, sans l
5、accord 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 CEI de votre pays de rsiden
6、ce. IEC Central Office 3, rue de Varemb CH-1211 Geneva 20 Switzerland Email: inmailiec.chWeb: www.iec.chAbout the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related
7、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/searchpub The IEC on-line Cata
8、logue 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 It also gives information on projects, withdrawn and replaced publications.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. Just Published details twic
9、e 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 equivalent terms in additional langua
10、ges. 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: Email: csciec.chTel.: +41 22
11、 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. A propos des publications CEI
12、 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-ligne de la CEI vous permet
13、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 publications de la CEI. Just
14、 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 dfinitions en anglais et en franais
15、, 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 si vous avez des questions,
16、visitez le FAQ du Service clients ou contactez-nous: Email: csciec.chTl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60986Edition 2.1 2008-11INTERNATIONAL STANDARD NORME INTERNATIONALEShort-circuit temperature limits of electric cables with rated voltages from 6 kV (Um= 7,2 kV) up to 30 kV (Um= 36 k
17、V) Limites de temprature de court-circuit des cbles lectriques de tensions assignes de 6 kV (Um= 7,2 kV) 30 kV (Um= 36 kV) INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE CBICS 29.060.20 PRICE CODECODE PRIXISBN 2-8318-1014-6 Registered trademark of the Internatio
18、nal Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60986 IEC:2000+A1:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references6 3 Factors governing the application of the temperature limits .6 3.1 General .6 3.2 Cables.7 3.3 Accessories.8 3
19、.4 Installation conditions 8 4 Maximum permissible short-circuit temperatures for cables with rated voltages from 6 kV (Um= 7,2 kV) up to 30 kV (Um= 36 kV) .9 4.1 Insulation materials9 4.2 Oversheath and bedding materials where there are no electrical or other requirements 9 4.3 Conductor/metallic s
20、heath/screen/armour materials and methods of connection .10 Table 1 Temperature limits for insulation materials .9 Table 2 Temperature limits for oversheath materials.10 Table 3 Temperature limits for current-carrying components.10 60986 IEC:2000+A1:2008 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION S
21、HORT-CIRCUIT TEMPERATURE LIMITS OF ELECTRIC CABLES WITH RATED VOLTAGES FROM 6 kV (Um= 7,2 kV) UP TO 30 kV (Um= 36 kV) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Comm
22、ittees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Avail
23、able Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental org
24、anizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical
25、 matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC Na
26、tional Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity
27、, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC p
28、rovides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment declared to be in conformity with an IEC Publication. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, emp
29、loyees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of t
30、he publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the
31、 possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60986 has been prepared by IEC technical committee 20: Electric cables. This consolidated ve
32、rsion of IEC 60986 consists of the second edition (2000) documents 20/398/FDIS and 20/417/RVD and its amendment 1 (2008) documents 20/952/FDIS and 20/975/RVD. The technical content is therefore identical to the base edition and its amendment and has been prepared for user convenience. It bears the e
33、dition number 2.1. A vertical line in the margin shows where the base publication has been modified by amendment 1. 4 60986 IEC:2000+A1:2008 The committee has decided that the contents of the base publication and its amendments will remain unchanged until the maintenance result date indicated on the
34、 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. 60986 IEC:2000+A1:2008 5 INTRODUCTION Editorially, this second edition of IEC 60986 is brought into li
35、ne with IEC 60724, third edition, and IEC 61443, first edition. The following four aspects may be applicable when selecting the short-circuit rating of a cable system: a) the permissible maximum temperature limits for cable components (e.g. conductor, insulation, screen or metallic sheath, bedding,
36、armour and oversheath). For the range of voltages covered by this standard, dielectric integrity is a major limitation. For practical purposes, the energy producing the temperature rise is usually expressed by an equivalent (I2t) value so that the permitted maximum duration for a given short-circuit
37、 current can be calculated; b) the maximum value of current which will not cause mechanical failure (such as bursting) due to electromagnetic forces. Irrespective of any temperature limitations, this determines a maximum current which should not be exceeded; c) the thermal performance of joints and
38、terminations at the limits of current and duration specified for the associated cable. Accessories should also withstand the thermo-mechanical and electromagnetic forces produced by the short-circuit current in the cable; d) the influence of installation conditions on the above three aspects. Aspect
39、 a) is dealt with in detail in this standard, and the limits given are based on a consideration of the cable only. A single short-circuit application is not expected to produce any significant damage to the cable, but repeated short-circuits may cause cumulative damage. Guidance is given, where appr
40、opriate, on aspects c) and d), mainly as they concern thermo-mechanical forces in the conductors and metallic sheath. Aspect b) is not covered in this standard. The limits recommended in this standard should be used for guidance only. There is little scientific evidence available on the behaviour of
41、 actual cables under short-circuit conditions, most of the information being based on the tests on the constituent material themselves. It has been necessary to exercise considerable judgement in setting these recommended limits, and in general, especially for the dielectric, the best average of pre
42、sent usage has been suggested. It is not possible to provide complete limits for joints and terminations because their construction is not standardized and performance varies. Where the full short-circuit capability of the cable is needed the accessories should be designed appropriately, but this is
43、 not always economically justified and the short-circuit capability of a cable system may be determined by the performance of its joints and terminations. Where possible, guidance has been included on the performance of accessories when they are installed on cables subject to the short-circuit limit
44、s given in this standard. 6 60986 IEC:2000+A1:2008 SHORT-CIRCUIT TEMPERATURE LIMITS OF ELECTRIC CABLES WITH RATED VOLTAGES FROM 6 kV (Um= 7,2 kV) UP TO 30 kV (Um= 36 kV) 1 Scope This International Standard gives guidance on the short-circuit maximum temperature limits of electric cables having rated
45、 voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV), with regard to the following: insulating materials; oversheath and bedding materials; conductor and metallic sheath materials and methods of connection. The design of accessories and the influence of the installation conditions on the tempe
46、rature limits are taken into consideration. The calculation of the permissible short-circuit current in the current-carrying components of the cable should be carried out in accordance with IEC 60949. 2 Normative references The following referenced documents are indispensable for the application of
47、this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60055 (all parts), Paper-insulated metal-sheathed cables for rated voltages up to 18/30 kV (with copper or aluminium cond
48、uctors and excluding gas-pressure and oil-filled cables) IEC 60141 (all parts),Tests on oil-filled and gas-pressure cables and their accessories IEC 60502-2:1998, Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um= 1,2 kV) up to 30 kV (Um= 36 kV) Part 2: Cab
49、les for rated voltages from 6 kV (Um= 7,2 kV) up to 30 kV (Um= 36 kV) IEC 60949:1988, Calculation of thermally permissible short-circuit currents, taking into account the non-adiabatic heating effects 3 Factors governing the application of the temperature limits 3.1 General The short-circuit temperatures given in clause 4 are the actual temperatures of the current-carrying component as limited by the adjacent material in
