1、BRITISH STANDARDBS EN 62420:2008Concentric lay stranded overhead electrical conductors containing one or more gap(s)ICS 29.060.10; 29.240.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60
2、g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 62420:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2008 BSI 2008ISBN 978 0 580 57675 1National forewordThis British Standard is the UK implementation of EN 62420:2008. It is id
3、entical to IEC 62420:2008. The UK participation in its preparation was entrusted to Technical Committee GEL/7, Overhead electrical conductors.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessa
4、ry provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN 62420 NORME EUROPENNE EUROPISCHE NORM August 2008 CENELEC Eu
5、ropean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide
6、for CENELEC members. Ref. No. EN 62420:2008 E ICS 29.240.20; 29.060.10 English version Concentric lay stranded overhead electrical conductors containing one or more gap(s) (IEC 62420:2008) Conducteurs pour lignes lectriques ariennes cbls en couches concentriques comprenant un ou plusieurs intervalle
7、(s) (CEI 62420:2008) Leiter fr Freileitungen aus konzentrisch verseilten runden Drhten mit einem oder mehreren Zwischenraum/rumen (IEC 62420:2008) This European Standard was approved by CENELEC on 2008-06-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipula
8、te the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard
9、exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national e
10、lectrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Swi
11、tzerland and the United Kingdom. Foreword The text of document 7/587/FDIS, future edition 1 of IEC 62420, prepared by IEC TC 7, Overhead electrical conductors, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62420 on 2008-06-01. The following dates were fixed: latest
12、 date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2009-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-06-01 Annex ZA has been added by CENELEC. _ Endorsemen
13、t notice The text of the International Standard IEC 62420:2008 was approved by CENELEC as a European Standard without any modification. _ 2 BS EN 62420:2008CONTENTS 1 2 3 4 5 5.1 5.2 5.3 5.4 5.4.1 5.4.2 5.4.3 5.4.4 5.4.5 5.4.6 6 6.1 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.3 6.3.1 6.3.2 6.3.3 6.3.4
14、 6.3.5 6.3.6 6.3.7 7 7.1 7.2 8 8.1 8.2 8.3 3 BS EN 62420:2008Scope.5 Normative references .5 Terms and definitions .5 Designation system 7 Requirements for stranded conductors .7 Material.7 Conductor sizes 7 Surface .7 Stranding 7 General .7 Lay ratio for core wires 7 Lay ratio for aluminium layer(s
15、) .8 Joints 8 Linear mass.8 Tests 9 Conductor strength 9 Classification of tests 9 Type Tests 9 Length of sample required .9 Joints in aluminium wires.9 Annular gap(s).9 Stress-strain curves.10 Breaking strength of conductor 10 Creep curves.10 Sample tests .10 Cross-sectional area11 Overall diameter
16、 11 Linear mass.11 Surface condition.11 Lay ratio and direction of lay11 Breaking strength of wires after stranding (if requested) 12 Wire canting on the outside layer (if requested).12 Inspection.12 Test location .12 Acceptance or rejection.12 Packaging and marking 13 Packaging .13 Marking and tare
17、 .13 Random lengths 13 Annex A (normative) Information to be supplied by purchaser17 Annex B (normative) Stress-strain test method 18 Annex C (normative) Nominal mass of grease for stranded conductors 21 Annex E (informative) Recommended conductor sizes and tables of conductor Table 3 Standard incre
18、mentsa 4 BS EN 62420:2008Annex D (informative) Alternate method of measuring the gap(s) within the conductor.24 properties .25 Figure 1 Examples of conductors containing one or more gaps 15 Figure 2 Method of measuring wire canting16 Figure C.1 Illustration for calculation of mass of grease in round
19、 wire layer (s） 21 Figure C.2 Illustration of calculation of mass of grease for core layer(s).22 Figure C.3 Illustration of calculation of grease for annular gap(s).23 Table 1 Metal combinations permitted14 Table 2 Number of joints permitted in aluminium wires.15 due to stranding .15 Table E.1 Prope
20、rties of some A1G/S1A conductors with gaps26 Annex ZA (normative) Normative references to international publications with their corresponding European publications 27CONCENTRIC LAY STRANDED OVERHEAD ELECTRICAL CONDUCTORS CONTAINING ONE OR MORE GAP(S) 1 Scope This International Standard specifies the
21、 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 608
22、89, 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, designated
23、 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
24、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 freel
25、y 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 document
26、. 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 c
27、onductors 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 Term
28、s and definitions For the purposes of this document, the following terms and definitions apply. 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 conductor 5 BS EN 62420:
29、20083.3 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
30、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-ha
31、nd 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
32、 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 conductor 3.11 lay ratio ratio of the lay length to the external diameter of the corresponding layer of wires in the stranded conduct
33、or 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
34、 and to which tolerances are applied NOTE Nominal values should be target values. 3.14 rated tensile strength calculated maximum tensile load value at which a conductor may be subjected before one or more of its constituent wires break 3.15 round wire filament of drawn metal having a constant circul
35、ar cross-section 6 BS EN 62420:20083.16 self-supporting layer layer made of formed wires which are designed in such a way as to not rely on the underlying layer for support 4 Designation system A designation system is used to identify stranded conductors containing one or more gap(s).Conductors are
36、designated AxGy/Syz or AxGy/SA where Ax identifies external wires (or the envelope), Gy denotes the presence and the number of annular gap(s) between two or more layers, and Syz and SA identify the steel core.In the designation of zinc coated wires, y represents the type of steel (regular, high or e
37、xtra high strength) and z represents the class of zinc coating (A or B). Conductors are identified as follows: a) a code number giving the equivalent conductive section of A1 expressed in mm2; b) a code number giving the section of the core material in mm2; c) a designation identifying the type of w
38、ires constituting the conductor in accordance with the second paragraph of this clause. The first designation (Ax) applies to the envelope, the second designation (Gy) applies to the presence and number of annular gap(s), and the third designation (Syz or SA) applies to the core; d) a code number de
39、signating the outside diameter of the conductor. Example: 400/66-A1G2/S1A-274: A conductor made of 400 mm2A1 and 66 mm2S1A (regular strength steel), containing two annular gaps, with a nominal outside diameter of 27,4 mm (274 x 0,1). 5 Requirements for stranded conductors 5.1 Material Stranded condu
40、ctors shall be made up of round and/or formed aluminium wires and of zinc-coated steel or aluminium-clad wires. Before stranding all wires shall have the properties as specified in the International Standards given in Clause 2. 5.2 Conductor sizes A list of conductor sizes is given as guidance in An
41、nex E. Conductors for existing or established designs of overhead lines as well as sizes and strandings not included in this standard may be designed and supplied as agreed upon by the manufacturer and purchaser and the relevant requirements of this standard shall apply. 5.3 Surface The surface of t
42、he conductor shall be free from all imperfections visible to the unaided eye (normal corrective lenses accepted), such as nicks, indentations, etc., not consistent with good commercial practice. 5.4 Stranding 5.4.1 General All wires of the conductor shall be concentrically stranded. Before stranding
43、, aluminium and core wires shall have approximately uniform temperature. Adjacent wire layers shall be stranded with reverse lay directions. The direction of lay of the external layer shall be right-hand except when specifically indicated in the purchase order. 5.4.2 Lay ratio for core wires The lay
44、 ratios for the zinc-coated (galvanised) steel or aluminium-clad wire layers shall be as follows: a) the lay ratio for the six-wire layer of the core shall be not less than 16 nor more than 26; 7 BS EN 62420:2008b) the lay ratio for subsequent core layers shall be not less than 14 nor more than 22.
45、The lay ratio of subsequent layer(s) shall be not greater than the lay ratio of the core layer immediately beneath it. All core wires shall lie naturally in their position in the stranded core, and where the core is cut, the wire ends shall remain in position or be readily replaced by hand and then
46、remain approximately in position. 5.4.3 Lay ratio for aluminium layer(s) The lay ratios for the aluminium layer(s) shall be as follows: a) the lay ratio for the outside layer of aluminium wires shall be not less than 10 nor more than 14; b) the lay ratios for the inner layers of aluminium wires shal
47、l be not less than 10 nor more than 16; c) the lay ratio of any aluminium layer shall be not greater than the lay ratio of the aluminium layer immediately beneath it. Aluminium wires composing the outside layer of the conductor shall lie naturally in their position, and where the conductor is cut, t
48、hey shall remain in position or be readily replaced by hand and then remain approximately in position. 5.4.4 Joints There shall be no joints of any kind made in the core wire or wires during stranding. There shall be no joints in the finished aluminium wire prior to stranding. During stranding, no a
49、luminium wire welds shall be made for the purpose of achieving the required conductor length. Joints are permitted in aluminium wires unavoidably broken during stranding, provided such breaks are not associated with either inherently defective wire or with the use of short lengths of aluminium wires. Joints shall conform to the geometry of original wire, i.e. joints shall be dressed smoothly with a shape equal to that of the parent wires and shall not be kinked. Joints in aluminium wires shall not exceed those specifie
