IEC 61443 Edition 1.1-2008 Short-circuit temperature limits of electric cables with rated voltages above 30 kV (Um = 36 kV)《额定电压超过30 kV(U = 36 kV)的电缆的短路温度极限》.pdf

1、 IEC 61443Edition 1.1 2008-11INTERNATIONAL STANDARD NORME INTERNATIONALEShort-circuit temperature limits of electric cables with rated voltages above 30 kV (Um= 36 kV) Limites de temprature de court-circuit des cbles lectriques de tension assigne suprieure 30 kV (Um= 36 kV) IEC61443:1999+A1:2008 THI

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16、 contactez-nous: Email: csciec.chTl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 61443Edition 1.1 2008-11INTERNATIONAL STANDARD NORME INTERNATIONALEShort-circuit temperature limits of electric cables with rated voltages above 30 kV (Um= 36 kV) Limites de temprature de court-circuit des cbles lectriq

17、ues de tension assigne suprieure 30 kV (Um= 36 kV) INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE CBICS 29.060.20 PRICE CODECODE PRIXISBN 2-8318-1014-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotec

18、hnique Internationale 2 61443 IEC:1999+A1:2008 CONTENTS FOREWORD.3 INTRODUCTION.5 1 Scope.6 2 Normative references6 3 Factors governing the application of the temperature limits .6 4 Maximum permissible short-circuit temperatures for cables with rated voltages above 30 kV (Um = 36 kV).8 Table 1 Temp

19、erature limits for insulation materials .9 Table 2 Temperature limits for oversheath materials.9 Table 3 Temperature limits for current-carrying components.10 61443 IEC:1999+A1:2008 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION SHORT-CIRCUIT TEMPERATURE LIMITS OF ELECTRIC CABLES WITH RATED VOLTAGES AB

20、OVE 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 Committees). The object of IEC is to promote international co-operation on all questions concerning

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29、) 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 possibility that some of the elements of this IEC Publication may be the subject of patent rig

30、hts. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 61443 has been prepared by subcommittee 20A: High-voltage cables, of IEC technical committee 20: Electric cables. This consolidated version of IEC 61443 consists of the first edition (199

31、9) documents 20A/409/FDIS and 20A/411/RVD and its amendment 1 (2008) documents 20/953/FDIS and 20/976/RVD. The technical content is therefore identical to the base edition and its amendment and has been prepared for user convenience. It bears the edition number 1.1. A vertical line in the margin sho

32、ws where the base publication has been modified by amendment 1. 4 61443 IEC:1999+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 IEC web site under “http:/webstore.iec.ch“ in the d

33、ata related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 61443 IEC:1999+A1:2008 5 INTRODUCTION The following four aspects may be applicable when selecting the short-circuit rating of a cable system. a) The permi

34、ssible maximum temperature limits for cable components (e.g. conductor, insulation, screen or metallic sheath, bedding, armour and oversheath). For the range of voltages covered by this standard, dielectric integrity is the major limitation. For practical uses, the energy producing the temperature r

35、ise is usually expressed by an equivalent (I2t) value so that the permitted maximum duration for a given short-circuit 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

36、limitations, this determines a maximum current which should not be exceeded. c) The thermal performance of joints and 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

37、the short-circuit current in the cable. d) The influence of installation conditions on the above three aspects. Aspect a) is dealt with in detail, 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

38、 to the cable, but repeated short-circuits may cause cumulative damage. Guidance is given, where appropriate, 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

39、 should be used for guidance only. There is little scientific evidence available on the behaviour of actual cables under short-circuit conditions, most of the information being based on tests on the constituent materials themselves. It has been necessary to exercise considerable judgement in setting

40、 these recommended limits, and, in general, especially for the dielectric, the best average of present 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-circu

41、it capability of the cable is needed, the accessories should be designed appropriately, but this is 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

42、the performance of accessories when they are installed on cables subject to the short-circuit limits given in this standard. 6 61443 IEC:1999+A1:2008 SHORT-CIRCUIT TEMPERATURE LIMITS OF ELECTRIC CABLES WITH RATED VOLTAGES ABOVE 30 kV (Um = 36 kV) 1 Scope This International Standard gives guidance on

43、 the short-circuit maximum temperature limits of electric cables having rated voltages above 30 kV (Um = 36 kV) up to the voltage limits given in IEC 60141 and IEC 62067, with regard to the following: insulating materials; oversheath and bedding materials; conductor and metallic sheath materials and

44、 methods of connection. The design of accessories and the influence of the installation conditions on the temperature 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

45、 IEC 60949. 2 Normative references The following referenced documents are indispensable for the application of 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 60141 (all

46、 parts), Tests on oil-filled and gas-pressure cables and their accessories IEC 60840:1999, Power cables with extruded insulation and their accessories for rated voltages above 30 kV (Um = 36 kV) up to 150 kV (Um = 170 kV) Test methods and requirements IEC 60949:1988, Calculation of thermally permiss

47、ible short-circuit currents, taking into account the non-adiabatic heating effects IEC 62067, Power cables with extruded insulation and their accessories for rated voltages above 150 kV (Um= 170 kV) up to 500 kV (Um= 550 kV) Test methods and requirements 3 Factors governing the application of the te

48、mperature 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 the cable and are valid for short-circuit durations of up to 5 s. When calculating the allowable short-circuit current, t

49、hese temperatures will be obtained if heat loss into the insulation during the short circuit is taken into account (non-adiabatic heating). If heat loss during the short-circuit is neglected (adiabatic heating), the calculations give short-circuit currents that are on the safe side. NOTE The temperature limits given in clause 4 should also not be exceeded with repeated short-circuits occuring in a short time. 61443