IEC 60986 Edition 2.1-2008 Short-circuit temperature limits of electric cables with rated voltages from 6 kV (Um = 7 2 kV) up to 30 kV (Um = 36 kV)《额定电压从6kV(U= 7.2 kV)到30 kV(U= 36 kV)的电缆的短路温度极限》.pdf

《IEC 60986 Edition 2.1-2008 Short-circuit temperature limits of electric cables with rated voltages from 6 kV (Um = 7 2 kV) up to 30 kV (Um = 36 kV)《额定电压从6kV(U= 7.2 kV)到30 kV(U= 36 kV)的电缆的短路温度极限》.pdf》由会员分享，可在线阅读，更多相关《IEC 60986 Edition 2.1-2008 Short-circuit temperature limits of electric cables with rated voltages from 6 kV (Um = 7 2 kV) up to 30 kV (Um = 36 kV)《额定电压从6kV(U= 7.2 kV)到30 kV(U= 36 kV)的电缆的短路温度极限》.pdf（24页珍藏版）》请在麦多课文档分享上搜索。

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

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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

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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