SIST EN 62420:2009
Concentric lay stranded overhead electrical conductors containing one or more gap(s)
Concentric lay stranded overhead electrical conductors containing one or more gap(s)
This International Standard specifies the 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 60889, 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 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.
Leiter für Freileitungen aus konzentrisch verseilten runden Drähten mit einem oder mehreren Zwischenraum/räumen
Conducteurs pour lignes électriques aériennes câblés en couches concentriques comprenant un ou plusieurs intervalle(s)
La CEI 62420:2008 spécifie les caractéristiques électriques et mécaniques des conducteurs pour lignes électriques aériennes, câblés en couches concentriques comprenant une ou plusieurs couches d'aluminium ou d'alliage d'aluminium autoporteuses, constituées de combinaisons de l'un des câbles métalliques suivants:
- aluminium écroui dur selon la CEI 60889, désigné A1;
- alliage d'aluminium de type A ou B selon la CEI 60104, désigné A2 ou A3;
- type d'alliage d'aluminium résistant à la chaleur selon la CEI 62004, désigné AT1, AT2, AT3 ou AT4;
- acier à résistance normale selon la CEI 60888, désigné S1A ou S1B;
- acier à haute résistance selon la CEI 60888, désigné S2A ou S2B;
- acier à très haute résistance selon la CEI 60888, désigné S3A;
- acier revêtu d'aluminium selon la CEI 61232, désigné 20SA, 27SA, 30SA ou 40SA.
Pleteni koncentrično ležeči nadzemni električni vodi z eno ali več režami (IEC 62420:2008)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 62420:2009
01-januar-2009
3OHWHQLNRQFHQWULþQROHåHþLQDG]HPQLHOHNWULþQLYRGL]HQRDOLYHþUHåDPL ,(&
Concentric lay stranded overhead electrical conductors containing one or more gap(s)
Leiter für Freileitungen aus konzentrisch verseilten runden Drähten mit einem oder
mehreren Zwischenraum/räumen
Conducteurs pour lignes électriques aériennes câblés en couches concentriques
comprenant un ou plusieurs intervalle(s)
Ta slovenski standard je istoveten z: EN 62420:2008
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 62420:2009 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 62420:2009
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SIST EN 62420:2009
EUROPEAN STANDARD
EN 62420
NORME EUROPÉENNE
August 2008
EUROPÄISCHE NORM
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 électriques Leiter für Freileitungen aus
aériennes câblés en couches konzentrisch verseilten runden Drähten
concentriques comprenant mit einem oder mehreren
un ou plusieurs intervalle(s) Zwischenraum/räumen
(CEI 62420:2008) (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 stipulate 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 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 electrotechnical 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, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für 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 for CENELEC members.
Ref. No. EN 62420:2008 E
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SIST EN 62420:2009
EN 62420:2008 - 2 -
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 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.
__________
Endorsement notice
The text of the International Standard IEC 62420:2008 was approved by CENELEC as a European
Standard without any modification.
__________
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SIST EN 62420:2009
- 3 - EN 62420:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
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 EN 60889 1997
line conductors
IEC 61232 (mod) 1993 Aluminium-clad steel wires for electrical EN 61232 1995
purposes + corr. February 1996
+ A11 2000
IEC 61395 1998 Overhead electrical conductors - Creep EN 61395 1998
test procedures for stranded conductors
IEC 62004 2007 Thermal resistant aluminium alloy wire for –
–
overhead line conductor
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SIST EN 62420:2009
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SIST EN 62420:2009
IEC 62420
Edition 1.0 2008-04
INTERNATIONAL
STANDARD
Concentric lay stranded overhead electrical conductors containing one or more
gap(s)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
U
ICS 29.240.20, 29.060.10 ISBN 2-8318-9721-1
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SIST EN 62420:2009
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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 .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.9
5.4.6 Conductor strength .10
6 Tests .10
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
6.3.1 Cross-sectional area.12
6.3.2 Overall diameter .12
6.3.3 Linear mass.12
6.3.4 Surface condition.12
6.3.5 Lay ratio and direction of lay.12
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
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 purchaser.18
Annex B (normative) Stress-strain test method .19
Annex C (normative) Nominal mass of grease for stranded conductors .22
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Annex D (informative) Alternate method of measuring 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 gaps .16
Figure 2 – Method of measuring wire canting.17
Figure C.1 – Illustration for calculation of mass of grease in round 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 permitted.15
Table 2 – Number of joints permitted in aluminium wires.16
a
Table 3 – Standard increments due to stranding .16
Table E.1 – Properties of some A1G/S1A conductors with gaps.27
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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 electrotechnical 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 Specifications,
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, governmental 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 decisions 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 international 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 order 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 clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual 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, 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 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:
Overhead 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 drafted in accordance with the ISO/IEC Directives, Part 2.
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SIST EN 62420:2009
62420 © IEC:2008(E) – 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,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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SIST EN 62420:2009
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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, 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 60889, 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 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 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 freely 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.
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 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 Terms 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
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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 used 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 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-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
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 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 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 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 circular cross-section
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3.16
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 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 extra high strength) and z represents the class of
zinc coating (A or B).
Conductors are identified as follows:
2
a) a code number giving the equivalent conductive section of A1 expressed in mm ;
2
b) a code number giving the section of the core material in mm ;
c) a designation identifying the type of wires 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 designating the outside diameter of the conductor.
2 2
Example: 400/66-A1G2/S1A-274: A conductor made of 400 mm A1 and 66 mm S1A (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 conductors 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 Annex 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 the 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, 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 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;
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b) the lay ratio for subsequent core layers shall be not less than 14 nor more than 22. 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 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 shall 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, they 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 aluminium 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 specified in Table 2. These joints shall not
be closer than 15 m from a joint in the same wire or in any other aluminium wire of the
completed conductor.
Joints shall be made by electric butt welding, electric butt cold upset welding or cold pressure
welding (see Note 1) and other approved methods. These joints shall be made in accordance
with good commercial practice. The first type of joints shall be electrically annealed for
approximately 250 mm on both sides of the weld.
While the joints specified in this clause are not required to meet the requirements of unjointed
wires (see Note 2), they shall withstand a stress of not less than 75 MPa for annealed electric
butt welded joints and not less than 130 MPa for cold pressure and electric butt cold upset
welded joints. The manufacturer shall demonstrate that the proposed welding method is
capable of meeting the specified strength requirements.
NOTE 1 It is a practice in some countries to require the annealing of cold pressure joints made in A2 or A3
material.
NOTE 2 The behaviour of properly spaced wire joints in stranded conductors is related to both tensile strength
and elongation. Because of higher elongation properties, the lower strength annealed electric butt welded joint
gives a similar overall performance to that of a cold pressure or an electric butt cold upset welded joint.
5.4.5 Linear mass
The masses given in the Table E.1 of Annex E have been calculated for each size and
stranding of conductor using densities for the aluminium, aluminium-clad and zinc-coated
steel wires as given in the standards listed in Clause 2, the stranding increments given in
Table 3, and the cross-sectional areas for aluminium and core wires based on their theoretical
unrounded values.
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The increments in per cent, for mass due to stranding, based on the mean lay ratios given in
5.4.2 and 5.4.3, shall be taken as given in Table 3. If greater accuracy is desired, actual lay
factors shall be used.
Whenever a conductor is to be greased, the nominal mass of grease shall be calculated
according to the method given in Annex C.
5.4.6 Conductor strength
The rated tensile strength at room temperature of composite conductors shall be the sum of
the tensile strength of the aluminium portion plus the strength of the core corresponding to an
elongation compatible with that of aluminium at rupture load. For the purpose of specification
and practicability, the strength of steel and aluminium-clad steel is conservatively established
as the stress corresponding to 1 % elongation in a 250 mm gauge length.
The tensile strength of any single wire is the product of its nominal area and the appropriate
minimum stress given in the standards listed in Clause 2.
6 Tests
6.1 Classification of tests
Type tests are intended to verify the main characteristics of a conductor which depend mainly
on its design. They are carried out once for a new design or manufacturing process of
conductor and then subsequently repeated only when the design or manufacturing process is
changed.
Sample tests are intended to guarantee the quality of conductors and compliance with the
requirements of this standard.
6.2 Type tests
Type tests shall be carried out only on a conductor which meets the requirements of all the
relevant sample tests.
Type tests consist of the following:
a) joints in aluminium wires;
b) annular gap(s);
c) stress-strain curves;
d) breaking strength of conductor;
e) creep curves.
6.2.1 Length of sample required
The sample length required for tensile and stress-strain tests shall be at least 400 times the
diameter of the conductor but not less than 10 m.
The length of samples in this subclause is the minimum required for a good accuracy of
stress-strain curves. In cases where the manufa
...
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