1、 IEC 62420 Edition 1.0 2008-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Concentric lay stranded overhead electrical conductors containing one or more gap(s) Conducteurs pour lignes lectriques ariennes cbls en couches concentriques comprenant un ou plusieurs intervalles IEC 62420:2008 THIS PUBLICA
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16、ctez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 62420 Edition 1.0 2008-04 INTERNATIONAL STANDARD NORME INTERNATIONALE Concentric lay stranded overhead electrical conductors containing one or more gap(s) Conducteurs pour lignes lectriques ariennes cbls en couches concentri
17、ques comprenant un ou plusieurs intervalles INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 29.240.20; 29.060.10 PRICE CODE CODE PRIX ISBN 2-8318-1035-2 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Elec
18、trotechnique Internationale 2 62420 IEC:2008 CONTENTS FOREWORD.4 1 Scope.6 2 Normative 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 .9 5.4 Stranding 9 5.4.1 General .9 5.4.2 Lay ratio for co
19、re wires 9 5.4.3 Lay ratio for aluminium layer(s) .9 5.4.4 Joints 9 5.4.5 Linear mass.10 5.4.6 Conductor strength10 6 Tests10 6.1 Classification of tests 10 6.2 Type Tests 11 6.2.1 Length of sample required .11 6.2.2 Joints in aluminium wires.11 6.2.3 Annular gap(s).11 6.2.4 Stress-strain curves.11
20、6.2.5 Breaking strength of conductor 11 6.2.6 Creep curves.12 6.3 Sample tests .12 6.3.1 Cross-sectional area12 6.3.2 Overall diameter13 6.3.3 Linear mass.13 6.3.4 Surface condition.13 6.3.5 Lay ratio and direction of lay13 6.3.6 Breaking strength of wires after stranding (if requested) 14 6.3.7 Wir
21、e canting on the outside layer (if requested).14 7 Inspection.14 7.1 Test location .14 7.2 Acceptance or rejection.14 8 Packaging and marking 15 8.1 Packaging .15 8.2 Marking and tare .15 8.3 Random lengths 15 Annex A (normative) Information to be supplied by purchaser19 Annex B (normative) Stress-s
22、train test method 20 Annex C (normative) Nominal mass of grease for stranded conductors23 Annex D (informative) Alternate method of measuring the gap(s) within the conductor.27 62420 IEC:2008 3 Annex E (informative) Recommended conductor sizes and tables of conductor properties .28 Figure 1 Examples
23、 of conductors containing one or more gaps17 Figure 2 Method of measuring wire canting18 Figure C.1 Illustration for calculation of mass of grease in round wire layer (s） 23 Figure C.2 Illustration of calculation of mass of grease for core layer(s).24 Figure C.3 Illustration of calculation of grease
24、 for annular gap(s).25 Table 1 Metal combinations permitted16 Table 2 Number of joints permitted in aluminium wires.17 Table 3 Standard increments due to stranding .17 Table E.1 Properties of some A1G/S1A conductors with gaps29 4 62420 IEC:2008 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ CONCENTRIC
25、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 electrotechnical committees (IEC National Committees). The object of IEC is to promote int
26、ernational 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 Available Specifications (PAS) and Guides (hereaf
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33、dual 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 the publication, use of, or reliance upon, t
34、his 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 possibility that some of the elements of t
35、his 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: Overhead electrical conductors. This bilingual version (2009-04) replaces the Eng
36、lish version. 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. The French version of this standard has not been
37、 voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. 62420 IEC:2008 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 th
38、e data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 62420 IEC:2008 CONCENTRIC LAY STRANDED OVERHEAD ELECTRICAL CONDUCTORS CONTAINING ONE OR MORE GAP(S) 1 Scope This International Standard specifies the
39、 electrical and mechanical characteristics of concentric lay stranded overhead electrical conductors, containing 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 60
40、889, designated A1; b) aluminium alloy type A or B as per IEC 60104, designated A2 or A3; c) thermal resistant 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, designate
41、d S2A or S2B; f) extra-high strength steel as per IEC 60888, designated S3A; g) aluminium-clad steel as per 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
42、 common design feature and the presence of one or more gaps between layers, they are intended for different 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 free
43、ly over the core during installation, and therefore usually do not require more than one gap. The various metal 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 documen
44、t. For dated references, only the edition cited applies. For undated references, the latest edition of the 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
45、conductors IEC 60889:1987, Hard-drawn aluminium wire for overhead line conductors IEC 61232:1993, Aluminium-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 Ter
46、ms and definitions For the purposes of this document, the following terms and definitions apply. 62420 IEC:2008 7 3.1 aluminium 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 conduc
47、tor 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 used for carrying electric current consisting of a plurality of uninsulated wires twisted together 3.5 concentric lay stranded c
48、onductor 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 of 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-han
49、d 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 formed 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 hel
