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1、 IEC 62420 Edition 1.0 2008-04 INTERNATIONAL STANDARD Concentric lay stranded overhead electrical conductors containing one or more gap(s) IEC 62420:2008(E) Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2
2、008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 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 mean
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9、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 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MD
10、TNo reproduction or networking permitted without license from IHS -,-,- IEC 62420 Edition 1.0 2008-04 INTERNATIONAL STANDARD Concentric lay stranded overhead electrical conductors containing one or more gap(s) INTERNATIONAL ELECTROTECHNICAL COMMISSION U ICS 29.240.20, 29.060.10 PRICE CODE ISBN 2-831
11、8-9721-1 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 62420 IEC:2008(E) CONTENTS FOREWORD.4 1 Scope.6 2 Normative
12、 references .6 3 Terms and definitions .6 4 Designation system 8 5 Requirements for stranded conductors .8 5.1 Material.8 5.2 Conductor sizes 8 5.3 Surface .8 5.4 Stranding 8 5.4.1 General .8 5.4.2 Lay ratio for core wires 8 5.4.3 Lay ratio for aluminium layer(s) .9 5.4.4 Joints 9 5.4.5 Linear mass.
13、9 5.4.6 Conductor strength10 6 Tests10 6.1 Classification of tests 10 6.2 Type Tests 10 6.2.1 Length of sample required .10 6.2.2 Joints in aluminium wires.10 6.2.3 Annular gap(s).10 6.2.4 Stress-strain curves.11 6.2.5 Breaking strength of conductor 11 6.2.6 Creep curves.11 6.3 Sample tests .11 6.3.
14、1 Cross-sectional area12 6.3.2 Overall diameter12 6.3.3 Linear mass.12 6.3.4 Surface condition.12 6.3.5 Lay ratio and direction of lay12 6.3.6 Breaking strength of wires after stranding (if requested) 13 6.3.7 Wire canting on the outside layer (if requested).13 7 Inspection.13 7.1 Test location .13
15、7.2 Acceptance or rejection.13 8 Packaging and marking 14 8.1 Packaging .14 8.2 Marking and tare .14 8.3 Random lengths 14 Annex A (normative) Information to be supplied by purchaser18 Annex B (normative) Stress-strain test method 19 Annex C (normative) Nominal mass of grease for stranded conductors
16、22 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 62420 IEC:2008(E) 3 Annex D (informative) Alternate method of measu
17、ring the gap(s) within the conductor.25 Annex E (informative) Recommended conductor sizes and tables of conductor properties .26 Figure 1 Examples of conductors containing one or more gaps16 Figure 2 Method of measuring wire canting17 Figure C.1 Illustration for calculation of mass of grease in roun
18、d wire layer (s） 22 Figure C.2 Illustration of calculation of mass of grease for core layer(s).23 Figure C.3 Illustration of calculation of grease for annular gap(s).24 Table 1 Metal combinations permitted15 Table 2 Number of joints permitted in aluminium wires.16 Table 3 Standard incrementsa due to
19、 stranding .16 Table E.1 Properties of some A1G/S1A conductors with gaps27 Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -
20、,-,- 4 62420 IEC:2008(E) INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CONCENTRIC LAY STRANDED OVERHEAD ELECTRICAL CONDUCTORS CONTAINING ONE OR MORE GAP(S) FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotec
21、hnical committees (IEC National Committees). 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 Specification
22、s, Technical Reports, Publicly Available 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, g
23、overnmental and non- governmental organizations 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 decisi
24、ons or agreements of IEC on technical 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 interna
25、tional use and are accepted by IEC National 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 orde
26、r to promote international uniformity, 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 clea
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29、l fees) and expenses arising out of the 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 publ
30、ication. 9) Attention is drawn to the 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 62420 has been prepared by IEC technical committee 7: O
31、verhead electrical conductors. The text of this standard is based on the following documents: FDIS Report on voting 7/587/FDIS 7/588/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been draft
32、ed in accordance with the ISO/IEC Directives, Part 2. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 62420 IEC:2008(E
33、) 5 The committee has decided that the contents of this publication 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, repla
34、ced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001 Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking pe
35、rmitted without license from IHS -,-,- 6 62420 IEC:2008(E) CONCENTRIC LAY STRANDED OVERHEAD ELECTRICAL CONDUCTORS CONTAINING ONE OR MORE GAP(S) 1 Scope This International Standard specifies the electrical and mechanical characteristics of concentric lay stranded overhead electrical conductors, conta
36、ining one or more self- supporting aluminium or aluminium alloy layer(s) as depicted in Figure 1, made of combinations of any of the following metal wires: a) hard-drawn aluminium as per IEC 60889, designated A1; b) aluminium alloy type A or B as per IEC 60104, designated A2 or A3; c) thermal resist
37、ant aluminium alloy type as per IEC 62004, designated AT1, AT2, AT3 or AT4; d) regular strength steel as per IEC 60888, designated S1A or S1B; e) high strength steel as per IEC 60888, designated S2A or S2B; f) extra-high strength steel as per IEC 60888, designated S3A; g) aluminium-clad steel as per
38、 IEC 61232, designated 20SA, 27SA, 30SA or 40SA. NOTE This standard covers the construction of self-damping conductors, as well as gap-type conductors. Although both types of conductors share a common design feature and the presence of one or more gaps between layers, they are intended for different
39、 purposes. Self-damping conductors (SDC) may have more than one gap to provide increased self-damping, whereas gap-type conductors are so designed as to allow the aluminium layers to slide freely over the core during installation, and therefore usually do not require more than one gap. The various m
40、etal combinations permitted by this standard shall be in accordance with Table 1. 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
41、referenced document (including any amendments) applies. IEC 60104:1987, Aluminium-magnesium-silicon alloy wire for overhead line conductors IEC 60888:1987, Zinc-coated steel wires for stranded conductors IEC 60889:1987, Hard-drawn aluminium wire for overhead line conductors IEC 61232:1993, Aluminium
42、-clad steel wires for electrical purposes IEC 61395:1998, Creep test procedures for stranded conductors IEC 62004:2007, Thermal resistant aluminium alloy wire for overhead line conductors 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 alumin
43、ium all types of aluminium and aluminium alloys listed in Clause 1 3.2 annular gap constant space, void of any material except for air or grease, between two layers of a conductor Copyright International Electrotechnical Commission Provided by IHS under license with IECLicensee=Boeing Co/5910770001
44、Not for Resale, 07/25/2008 03:57:46 MDTNo reproduction or networking permitted without license from IHS -,-,- 62420 IEC:2008(E) 7 3.3 canting phenomena by which a formed wire is twisted relative to its own axis, thus producing a protuberance outside the layer 3.4 conductor material intended to be us
45、ed for carrying electric current consisting of a plurality of uninsulated wires twisted together 3.5 concentric lay stranded conductor conductor composed of a central core surrounded by one or more adjacent layers of wires being laid helically in opposite directions. 3.6 direction of lay direction o
46、f twist of a layer of wires as it moves away from the viewer , with a right-hand lay being a clockwise direction and a left-hand lay being an anti-clockwise direction 3.7 equivalent wire diameter the diameter of a round wire which would have the same cross-sectional area as a given formed wire 3.8 f
47、ormed wire filament of drawn or rolled metal having a constant, non-circular cross-section 3.9 layer group of wires located at a constant radial distance from the centre of the conductor 3.10 lay length axial length of one complete turn of the helix formed by an individual wire in a stranded conduct
48、or 3.11 lay ratio ratio of the lay length to the external diameter of the corresponding layer of wires in the stranded conductor 3.12 lot group of conductors manufactured by the same manufacturer under similar conditions of production NOTE A lot may consist of part or all of the purchased quantity. 3.13 nominal name or identifying value of a measurable property by which a conductor or component of a conductor is identified and t