SIST EN 50397-1:2021
(Main)Covered conductors for overhead lines and the related accessories for rated voltages above 1 kV AC and not exceeding 36 kV AC - Part 1: Covered conductors
Covered conductors for overhead lines and the related accessories for rated voltages above 1 kV AC and not exceeding 36 kV AC - Part 1: Covered conductors
This document contains the requirements for covered conductors with or without integrated longitudinal watertightness and/or semi-conductive conductor screen for applications in overhead lines with rated voltages U above 1 kV a.c. and not exceeding 36 kV a.c.
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung - Teil 1: Kunststoffumhüllte Freileitungsseile
Conducteurs gainés pour lignes aériennes et accessoires associés pour des tensions assignées supérieures à 1 kV en courant alternatif et ne dépassant pas 36 kV en courant alternatif - Partie 1: Conducteurs gainés
Le présent document contient les exigences pour les conducteurs gainés avec ou sans étanchéité longitudinale intégrée et/ou un écran semi-conducteur autour de l’âme pour les applications dans les lignes aériennes avec une tension assignée U supérieure à 1 kV en courant alternatif et ne dépassant pas 36 kV en courant alternatif.
Oplaščeni vodniki za nadzemne vode in ustrezen pribor za naznačene izmenične napetosti nad 1 kV, ki ne presegajo 36 kV - 1. del: Oplaščeni vodniki
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50397-1:2021
01-januar-2021
Nadomešča:
SIST EN 50397-1:2007
Oplaščeni vodniki za nadzemne vode in ustrezen pribor za naznačene izmenične
napetosti nad 1 kV, ki ne presegajo 36 kV - 1. del: Oplaščeni vodniki
Covered conductors for overhead lines and the related accessories for rated voltages
above 1 kV AC and not exceeding 36 kV AC - Part 1: Covered conductors
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit
Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung - Teil 1:
Kunststoffumhüllte Freileitungsseile
Conducteurs gainés pour lignes aériennes et accessoires associés pour des tensions
assignées supérieures à 1 kV en courant alternatif et ne dépassant pas 36 kV en courant
alternatif - Partie 1: Conducteurs gainés
Ta slovenski standard je istoveten z: EN 50397-1:2020
ICS:
29.060.20 Kabli Cables
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 50397-1:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50397-1:2021
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SIST EN 50397-1:2021
EUROPEAN STANDARD EN 50397-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 29.240.20 Supersedes EN 50397-1:2006 and all of its amendments
and corrigenda (if any)
English Version
Covered conductors for overhead lines and the related
accessories for rated voltages above 1 kV AC and not exceeding
36 kV AC - Part 1: Covered conductors
Conducteurs gainés pour lignes aériennes et accessoires Kunststoffumhüllte Leiter und zugehörige Armaturen für
associés pour des tensions assignées supérieures à 1 kV Freileitungen mit Nennspannungen über 1 kV und nicht
en courant alternatif et ne dépassant pas 36 kV en courant mehr als 36 kV Wechselspannung - Teil 1:
alternatif - Partie 1: Conducteurs gainés Kunststoffumhüllte Freileitungsseile
This European Standard was approved by CENELEC on 2020-10-26. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50397-1:2020 E
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
Contents Page
European foreword . 4
Introduction .5
1 Scope . 6
2 Normative references . 6
3 Definitions . 7
4 Covered conductors . 7
4.1 Code designation . 7
4.2 Construction requirements . 8
4.2.1 Conductor . 8
4.2.2 Filling. 8
4.2.3 Covering . 8
5 Marking . 10
5.1 Indication of origin . 10
5.2 Continuity of marks . 10
5.3 Other markings. 11
5.4 Durability . 11
5.5 Legibility . 11
6 Tests . 11
Annex A (normative) Measurement of the leakage current . 14
A.1 Test equipment . 14
A.2 Sampling . 14
A.3 Test procedure . 15
A.4 Test evaluation . 15
Annex B (normative) Tracking resistance . 16
B.1 Scope and object . 16
B.2 Definitions . 16
B.3 Test specimens . 16
B.3.1 Dimensions . 16
B.3.2 Preparation . 17
B.4 Apparatus . 17
B.4.1 Electrical apparatus . 17
B.4.1.1 General. 17
B.4.1.2 Power supply . 17
B.4.1.3 Resistor. 17
B.4.1.4 Voltmeter . 18
B.4.1.5 Overcurrent delay relay . 18
B.4.2 Electrodes . 19
B.4.2.1 General. 19
2
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
B.4.2.2 Top electrode. 19
B.4.2.3 Bottom electrode . 20
B.4.3 Contamination . 20
B.4.3.1 Contaminant . 20
B.4.3.2 Applicator paper . 20
B.4.3.3 Contaminant flow . 21
B.4.3.4 Flow rate . 21
B.4.4 Timing device . 21
B.4.5 Depth gauge . 21
B.5 Procedure . 22
B.5.1 Preparation of the test . 22
B.5.1.1 Ambient conditions . 22
B.5.1.2 Mounting . 22
B.5.1.3 Adjustment of the contaminant flow . 22
B.5.2 Application of the voltage. 22
B.5.3 Test evaluation . 22
B.6 Test report . 22
Annex C (normative) Slippage test . 23
C.1 Scope and object . 23
C.2 Definitions . 23
C.3 Test specimens . 23
C.3.1 Dimensions . 23
C.3.2 Preparation . 23
C.4 Apparatus — clamp. 24
C.5 Procedure and requirements . 24
C.5.1 General. 24
C.5.2 Test conditions . 24
C.6 Test report . 25
Annex D (normative) Non-electrical test on samples of complete cable — Resistance
to UV rays 26
D.1 Resistance to UV rays . 26
Bibliography . 28
3
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
European foreword
This document (EN 50397-1:2020) has been prepared by WG 13 “Covered Overhead Line Conductors” of
CLC/TC 20 “Electric cables”.
The following dates are fixed:
• latest date by which this document has (dop) 2021-10-26
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-10-26
standards conflicting with this document
have to be withdrawn
This document supersedes EN 50397-1:2006 and all of its amendments and corrigenda (if any).
EN 50397-1:2020 includes the following significant technical changes with respect to EN 50397-1:2006:
— new references to HD 605 S3 2019.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
The EN 50397 series consists of three parts:
— Part 1, “Covered conductors”;
— Part 2, “Accessories for covered conductors: Tests and acceptance criteria”; and
— Part 3, “Guide to use”
4
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
Introduction
The EN 50397 series covers the construction, performance and test requirements for covered conductors
for overhead lines having a nominal voltage U above 1 kV AC up to and including 36 kV AC, and for the
related accessories.
Covered conductors consist of a conductor surrounded by a covering made of insulating material as
protection against accidental contacts with other covered conductors and with grounded parts such as tree
branches, etc. In comparison with insulated conductors, this covering has reduced properties, but is able
to withstand the phase-to-earth voltage temporarily.
Since covered conductors are unscreened, they are not touch-proof, i.e. they should be treated as bare
conductors with respect to electric shock.
This document does not cover aspects related to the installation of overhead lines such as determination
of clearances, spans, sags, etc.
5
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
1 Scope
This document contains the requirements for covered conductors with or without integrated longitudinal
water tightness and/or semi-conductive conductor screen for applications in overhead lines with rated
voltages U above 1 kV a.c. and not exceeding 36 kV a.c.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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.
EN 50182:2001, Conductors for overhead lines - Round wire concentric lay stranded conductors
EN 60811-201, Electric and optical fibre cables - Test methods for non-metallic materials - Part 201:
General tests - Measurement of insulation thickness (IEC 60811-201)
1
EN 60811-401:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 401:
Miscellaneous tests - Thermal ageing methods - Ageing in an air oven (IEC 60811-401:2012)
EN 60811-402, Electric and optical fibre cables - Test methods for non-metallic materials - Part 402:
Miscellaneous tests - Water absorption tests (IEC 60811-402)
2
EN 60811-501:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 501:
Mechanical tests - Tests for determining the mechanical properties of insulating and sheathing compounds
(IEC 60811-501:2012)
EN 60811-502, Electric and optical fibre cables - Test methods for non-metallic materials - Part 502:
Mechanical tests - Shrinkage test for insulations (IEC 60811-502)
EN 60811-507, Electric and optical fibre cables - Test methods for non-metallic materials - Part 507:
Mechanical tests - Hot set test for cross-linked materials (IEC 60811-507)
3
EN 60811-508:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 508:
Mechanical tests - Pressure test at high temperature for insulation and sheaths (IEC 60811-508:2012)
EN 60811-605:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 605:
Physical tests - Measurement of carbon black and/or mineral filler in polyethylene compounds
(IEC 60811-605:2012)
EN 62219, Overhead electrical conductors - Formed wire, concentric lay, stranded conductors (IEC 62219)
EN 62230, Electric cables - Spark-test method (IEC 62230)
HD 605 S3:2019, Electric cables - Additional test methods
IEC 60502-2:2014, Power cables with extruded insulation and their accessories for rated voltages from 1
kV (U = 1,2 kV) up to 30 kV (U = 36 kV) - Part 2: Cables for rated voltages from 6 kV (U = 7,2 kV) up
m m m
to 30 kV (U = 36 kV)
m
———————
1
As impacted by EN 60811-401:2012/A1:2017.
2
As impacted by EN 60811-501:2012/A1:2018.
3
As impacted by EN 60811-508:2012/A1:2017.
6
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
3 Definitions
For the purpose of this document, the following definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1 Definitions relating to tests
3.1.1
type tests
T
tests required to be made before supplying a type of product covered by this document on a general
commercial basis in order to demonstrate satisfactory performance characteristics to meet the intended
application
Note 1 to entry: These tests are of such nature that, after they have been made, they need not be repeated unless
changes are made in the material, design or manufacturing process, which might change the performance
characteristics.
3.1.2
sample tests
S
tests made on samples of completed product or components taken from the completed product adequate
to verify that the finished product meets the design specifications
3.1.3
routine tests
R
tests made on all production lengths to demonstrate their integrity
3.2
rated voltage
reference voltage for which the conductor is designed and which serves to define the electrical tests
Note 1 to entry: The rated voltage is expressed by the value U, expressed in kilovolts, where U is the r.m.s. value
between any two-phase conductors.
4 Covered conductors
4.1 Code designation
Covered conductors shall be designated as follows:
Type code CC;
Covering material S (for semi-conductive conductor screen, if any),
X (for cross-linked polyethylene),
T (for thermoplastic polyethylene);
Conductor material and cross-section according to EN 50182;
Conductor design W (for watertight),
K (for compacted);
Rated voltage U in kV …kV.
7
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
EXAMPLE 1 OF DESIGNATION
“CCX 66-AL3 WK 20kV” is a XLPE-covered conductor with a rated voltage of 20 kV, longitudinal watertight
2
compacted conductor of aluminium alloy AL3 and a nominal conductor cross-section of 66 mm .
EXAMPLE 2 OF DESIGNATION
“CCST 66-A3F W 20 kV” is a thermoplastic polyethylene covered conductor with a rated voltage of 20 kV,
longitudinal watertight conductor with formed aluminium alloy wire AF3 and a nominal conductor cross-
2
section of 66mm .
4.2 Construction requirements
4.2.1 Conductor
Number of 1
conductors:
Conductor material: aluminium alloy or steel reinforced aluminium
2 2
Nom. cross-section: 25 mm to 400 mm for all conductors
Conductor design: the conductors may be compacted or non-compacted, with round wire or
profiled wire.
Information on bare conductors with round wires in frequent use can be found in the national lists, contained
in EN 50182:2001, Annex F. However, for the purpose of this document, conductors may be selected from
any national table. Conductors deviating in design from the standard values shall be given by the
manufacturer, but fulfilling all requirements given in EN 50182.
Information about conductors made from profiled wires shall be provided by the manufacturer.
Non-compacted conductors shall comply with EN 50182 or EN 62219 (with the exception of the filling, if
any).
For compacted conductors, based on conductors according to EN 50182, the following paragraph applies:
The outer diameter of the compacted conductor shall be 95 % (±1 % for 7 and 19-wire
constructions, ± 1,5 % for 37-wire constructions) of the diameter given in EN 50182. The rated tensile
strength (RTS) shall be at least 95 % of the value given in EN 50182. The DC resistance shall not exceed
the value given in EN 50182 by more than 5 %.
4.2.2 Filling
The stranded conductor may be longitudinally watertight by means of adequate measures as e.g. filling
with an adequate mass. The filling mass or other materials for obtaining the longitudinal watertightness,
shall be compatible with the conductor material and the material of the covering (see Table 2).
4.2.3 Covering
The covering shall consist of a cross-linked polyethylene compound, which shall comply with the
requirements according to Table 1, column 3 or of a thermoplastic polyethylene compound, complying with
the requirements according Table 1, column 4.
It shall be possible to remove the covering without damage to the conductor.
Table 1 — Properties of the covering materials
1 2 3 4
Unit
Compound designation X T
Basic material XLPE PE
8
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EN 50397-1:2020 (E)
1 2 3 4
Unit
a
Maximum operating temperature of the conductor °C 70
90
Mechanical properties
before ageing on sample (EN 60811-501:2012, 4.2)
minimum tensile strength MPa 12,5 12,5
minimum elongation at break % 200 300
1
after ageing on sample (of EN 60811-401:2012 , 4.2.3.2)
Temperature °C 135 110
Duration h 168 336
minimum tensile strength MPa - 12,5
maximum variation T1/T0 % ± 25 -
minimum elongation at break % - 300
maximum variation T1/T0 % ± 25 -
b
after ageing on complete product sample
1
(EN 60811-401:2012 , 4.2.3.4)
Temperature °C 100 ± 2 100 ± 2
Duration h 168 168
minimum tensile strength MPa - 12,5
maximum variation T2/T0 % ± 25 -
minimum elongation at break % - 300
maximum variation T2/T0 % ± 25 -
Physical and chemical properties
hot set test (EN 60811-507)
temperature °C 200 -
duration min 15 -
mechanical stress MPa 0,2 -
maximum elongation under load % 175 -
maximum residual elongation % 15 -
3
pressure test at high temperature (EN 60811-508:2012 ,
4.3)
temperature °C - 80
duration h - 4
coefficient k - - 0,8
maximum depth of indentation % - 50
Gravimetric water absorption (EN 60811-402)
temperature °C 85 85
duration h 336 336
2
maximum variation of mass mg/cm 1 1
shrinkage test (EN 60811-502)
distance L between marks mm 200 200
duration h 1 1
9
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EN 50397-1:2020 (E)
1 2 3 4
Unit
temperature °C 130 ± 3 100 ± 3
maximum shrinkage % 4 4
Shore D hardness (HD 605 S3:2019, 2.2.1)
minimum hardness ShD - 55
a
Maximum operating temperature of the conductor is limited to 80 °C due to mechanical reasons.
b
For use together with watertight conductors only. Adequate measures e.g. neutral capping to prevent leakage of filling
material shall be taken.
An UV-protection shall be provided. Covering materials having a content of carbon black of (2,5 ± 0,5) %
are considered to have adequate protection. Otherwise protection against UV shall be demonstrated
fulfilling the UV-test specified in Chapter 6, Table 2, No.4.3.
The nominal thickness of the covering shall be calculated according to the following formula:
S = 0,11 U
where
S is the nominal thickness of the covering in mm (rounded to one decimal place);
U is the rated voltage (see 3.2) in kV.
The nominal thickness of the covering shall be not less than 2,3 mm.
The minimum thickness of the covering at any place shall not be less than the nominal value by more than
(0,1 mm + 10 % of the nominal value). The mean value of the thickness of the covering shall not exceed
the nominal value by more than (0,1 mm + 10 % of the nominal value).
A semi-conductive conductor screen, if any, shall not be measured as covering thickness.
The covering shall be applied onto the conductor by extrusion of one or more material layers. In screened
versions (constructions), the extruded conductor screen should be durable firmly bonded to the closest
layer of insulation.
5 Marking
5.1 Indication of origin
Covered conductors shall be provided with an identification of origin consisting of a continuous marking of
the manufacturer’s name or trademark on the surface of the covering. This marking shall be made by
embossing.
5.2 Continuity of marks
The distance between the end of a mark and the beginning of the next identical mark shall not exceed
1 000 mm.
Figure 1 below shows an example of the marking, where the word “ORIGIN” stands for the mandatory
information required in 5.1 and “XYZ” stands for one of any other mandatory marks required in 5.3.
10
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SIST EN 50397-1:2021
EN 50397-1:2020 (E)
Figure 1 — Example of marking
5.3 Other markings
Covered conductors shall be equipped with a continuous embossing as follows:
— code designation according to 4.1;
— year of production;
— standard number.
Optional markings (e.g. slippage factor according to Annex C, meter marking) may be added upon
agreement between manufacturer and user. These optional markings may be made by printing or
embossing.
5.4 Durability
Printed markings shall be durable. Durability shall be checked by the test according to HD 605 S3:2019,
2.5.4. The markings shall be legible after this test.
5.5 Legibility
All markings shall be clearly legible. Printed markings shall be in contrasting colours.
6 Tests
The compliance with the requirements according to 4.2 and Clause 5 shall be established by visual
examination and the tests listed in Table 2.
A type test shall be performed on every covered conductor type, irrespective of the cross sectional area.
The results will be valid across the whole range of cross sectional areas for that type.
The slippage test shall be performed on each cross sectional area (see C.3.1).
Table 2 — Tests
1 2 3 4 5
No Tests Category Requirements Test methods
of tests
1 Electrical tests
a
1.1 Conductor resistance T, HD 605 S3:2019,
b
3.1.1
S
1.2 High voltage test
1.2.1 — for CC without conductor screen: no breakdown HD 605 S3:2019,
3.2.2.2
Test voltage (a.c.) 1 U
Number of specimen 1
Length of specimen (minimum) 5 m
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EN 50397-1:2020 (E)
1 2 3 4 5
No Tests Category Requirements Test methods
of tests
Duration of immersion in water (minimum) 1 h
Temperature of water (20 ± 5) °C
Test duration 15 min S
3 h T
1.2.2 — for CC with conductor screen or upon agreement no breakdown HD 605 S3:2019,
between customer and producer: 3.2.2.2
Test voltage (AC) 1 U
Number of specimen 1
Length of specimen (minimum) 5 m
Duration of immersion in water (minimum) 1 h
Temperature of water (20 ± 5) °C
Test duration 4 h S
48 h T
c
1.3 R no breakdown EN 62230
Spark test on the covering
Test voltage: AC 0,7 U
or DC 1 U
1.4 Leakage current T maximum Annex A
1 mA
Test voltage (AC) 0,7 U
d
1.5 T Annex B Annex B
Tracking resistance
2 Construction and dimensions
2.1 Compliance with the design requirements T, S, R 4.2 visual inspection
2.2 Thickness of the covering T, S, R 4.2.3 EN 60811-201
3 Construction and mechanical properties of the
conductor
b
3.1 Rated tensile strength a a
T, S
3.2 Construction and dimensions T, S a a
4 Non-electrical tests on the covering
4.1 Mechanical properties
a) before ageing of sample T 4.2.3 EN 60811-501:2012,
4.2
b) after ageing of sample T 4.2.3 EN 60811-401:2012,
4.2.3.2
e
4.2 T 4.2.3 EN 60811-605:2012,
Carbon black content
4.2
f
4.3 T Annex D
Resistance to UV rays
g
5
Test of compatibility
1
Ageing of complete product sample T 4.2.3
EN 60811-401:2012 ,
4.2.3.4
6 Thermal properties of the covering
6.1 Shrinkage test T 4.2.3 EN 60811-502
Distance “L” between marks (200 ± 5) mm
12
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EN 50397-1:2020 (E)
1 2 3 4 5
No Tests Category Requirements Test methods
of tests
h
6.2 T, S 4.2.3 EN 60811-507
Hot-set-test
i 3
6.3 T 4.2.3
Pressure test at high temperature EN 60811-508:2012 ,
4.3
7 Further tests on the covering
7.1 Gravimetric water absorption test T 4.2.3 EN 60811-402
i
7.2 T 4.2.3 HD 605 S3:2019,
Shore D hardness
2.2.1
g
8
Test of the longitudinal watertightness
8.1 With heat cycle T no leakage IEC 60502-2:2014,
Annex F
Number of specimen 1
Length of specimen 3 m
Test duration 24 h
Bending radius 20 D
8.2 Without heat cycle S no leakage IEC 60502-2:2014,
j
Annex F
Number of specimen 1
Length of specimen 1 m
Test duration 1 h
9 Marki
...
SLOVENSKI STANDARD
oSIST prEN 50397-1:2020
01-junij-2020
Oplaščeni vodniki za nadzemne vode in ustrezni pribor za naznačene izmenične
napetosti nad 1 kV, ki ne presegajo 36 kV - 1. del: Oplaščeni vodniki
Covered conductors for overhead lines and the related accessories for rated voltages
above 1 kV AC and not exceeding 36 kV AC - Part 1: Covered conductors
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit
Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung -- Teil 1:
Kunststoffumhüllte Freileitungsseile
Conducteurs gainés pour lignes aériennes et accessoires associés pour des tensions
assignées supérieures à 1 kV en courant alternatif et ne dépassant pas 36 kV en courant
alternatif – Partie 1: Conducteurs gainés
Ta slovenski standard je istoveten z: prEN 50397-1
ICS:
29.060.20 Kabli Cables
29.240.20 Daljnovodi Power transmission and
distribution lines
oSIST prEN 50397-1:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50397-1:2020
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oSIST prEN 50397-1:2020
EUROPEAN STANDARD DRAFT
prEN 50397-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 29.240.20 Will supersede EN 50397-1:2006 and all of its
amendments and corrigenda (if any)
English Version
Covered conductors for overhead lines and the related
accessories for rated voltages above 1 kV AC and not exceeding
36 kV AC - Part 1: Covered conductors
Conducteurs gainés pour lignes aériennes et accessoires To be completed
associés pour des tensions assignées supérieures à 1 kV
en courant alternatif et ne dépassant pas 36 kV en courant
alternatif - Partie 1: Conducteurs gainés
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2020-06-12.
It has been drawn up by CLC/TC 20.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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 CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 70523 Ref. No. prEN 50397-1 E
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Contents Page
1
2 European foreword . 4
3 Introduction .5
4 1 Scope .6
5 2 Normative references . 6
6 3 Definitions .7
7 4 Covered conductors . 7
8 4.1 Code designation . 7
9 4.2 Construction requirements . 8
10 4.2.1 Conductor . 8
11 4.2.2 Filling. 8
12 4.2.3 Covering. 8
13 5 Marking . 11
14 5.1 Indication of origin. 11
15 5.2 Continuity of marks . 11
16 5.3 Other markings . 11
17 5.4 Durability . 11
18 5.5 Legibility . 11
19 6 Tests . 11
20 Annex A (normative) Measurement of the leakage current . 15
21 A.1 Test equipment . 15
22 A.2 Sampling . 15
23 A.3 Test procedure . 16
24 A.4 Test evaluation . 16
25 Annex B (normative) Tracking resistance . 17
26 B.1 Scope and object . 17
27 B.2 Definitions . 17
28 B.3 Test specimens . 17
29 B.3.1 Dimensions . 17
30 B.3.2 Preparation . 17
31 B.4 Apparatus. 18
32 B.4.1 Electrical apparatus . 18
33 B.4.1.1 General . 18
34 B.4.1.2 Power supply . 18
35 B.4.1.3 Resistor . 18
36 B.4.1.4 Voltmeter . 18
37 B.4.1.5 Overcurrent delay relay . 19
38 B.4.2 Electrodes . 19
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39 B.4.2.1 General . 19
40 B.4.2.2 Top electrode . 20
41 B.4.2.3 Bottom electrode . 21
42 B.4.3 Contamination . 21
43 B.4.3.1 Contaminant . 21
44 B.4.3.2 Applicator paper . 21
45 B.4.3.3 Contaminant flow . 22
46 B.4.3.4 Flow rate . 22
47 B.4.4 Timing device . 22
48 B.4.5 Depth gauge . 22
49 B.5 Procedure. 23
50 B.5.1 Preparation of the test . 23
51 B.5.1.1 Ambient conditions . 23
52 B.5.1.2 Mounting . 23
53 B.5.1.3 Adjustment of the contaminant flow . 23
54 B.5.2 Application of the voltage . 23
55 B.5.3 Test evaluation . 23
56 B.6 Test report. 23
57 Annex C (normative) Slippage test . 24
58 C.1 Scope and object . 24
59 C.2 Definitions . 24
60 C.3 Test specimens . 24
61 C.3.1 Dimensions . 24
62 C.3.2 Preparation . 24
63 C.4 Apparatus — clamp . 24
64 C.5 Procedure and requirements . 25
65 C.5.1 General . 25
66 C.5.2 Test conditions . 25
67 C.6 Test report. 25
68 Annex D (normative) Non-electrical test on samples of complete cable — Resistance
69 to UV rays . 26
70 D.1 Resistance to UV rays . 26
71 Bibliography . 28
72
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73 European foreword
74 This document (prEN 50397-1:2020) has been prepared by WG13 “Covered Overhead Line Conductors”
75 of CLC/TC 20 "Electric cables".
76 This document is currently submitted to the Enquiry.
77 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
78 This document will supersede EN 50397-1:2006 and all of its amendments and corrigenda (if any).
79 The EN 50397 series consists of three parts:
80 — Part 1, “Covered conductors”; and
81 — Part 2, “Accessories for covered conductors: Tests and acceptance criteria”; and
82 — Part 3, “Guide to use”
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83 Introduction
84 The EN 50397 series covers the construction, performance and test requirements for covered conductors
85 for overhead lines having a nominal voltage U above 1 kV AC up to and including 36 kV AC, and for the
86 related accessories.
87 Covered conductors consist of a conductor surrounded by a covering made of insulating material as
88 protection against accidental contacts with other covered conductors and with grounded parts such as
89 tree branches, etc. In comparison with insulated conductors, this covering has reduced properties, but is
90 able to withstand the phase-to-earth voltage temporarily.
91 Since covered conductors are unscreened, they are not touch-proof, i.e. they should be treated as bare
92 conductors with respect to electric shock.
93 This document does not cover aspects related to the installation of overhead lines such as determination
94 of clearances, spans, sags, etc.
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95 1 Scope
96 This document contains the requirements for covered conductors with or without integrated longitudinal
97 watertightness and/or semi-conductive conductor screen for applications in overhead lines with rated
98 voltages U above 1 kV a.c. and not exceeding 36 kV a.c.
99 2 Normative references
100 The following documents are referred to in the text in such a way that some or all of their content
101 constitutes requirements of this document. For dated references, only the edition cited applies. For
102 undated references, the latest edition of the referenced document (including any amendments) applies.
103 EN 50182:2001, Conductors for overhead lines - Round wire concentric lay stranded conductors
104 EN 60811-201, Electric and optical fibre cables - Test methods for non-metallic materials - Part 201:
105 General tests - Measurement of insulation thickness (IEC 60811-201)
1
106 EN 60811-401:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part
107 401: Miscellaneous tests - Thermal ageing methods - Ageing in an air oven (IEC 60811-401:2012)
108 EN 60811-402, Electric and optical fibre cables - Test methods for non-metallic materials - Part 402:
109 Miscellaneous tests - Water absorption tests (IEC 60811-402)
2
110 EN 60811-501:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part
111 501: Mechanical tests - Tests for determining the mechanical properties of insulating and sheathing
112 (IEC 60811-501:2012)
113 EN 60811-502, Electric and optical fibre cables - Test methods for non-metallic materials - Part 502:
114 Mechanical tests - Shrinkage test for insulations (IEC 60811-502)
115 EN 60811-507, Electric and optical fibre cables - Test methods for non-metallic materials - Part 507:
116 Mechanical tests - Hot set test for cross-linked materials (IEC 60811-507)
3
117 EN 60811-508:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part
118 508: Mechanical tests - Pressure test at high temperature for insulation and sheaths (IEC 60811-
119 508:2012)
120 EN 60811-605:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 605:
121 Physical tests - Measurement of carbon black and/or mineral filler in polyethylene compounds
122 (IEC 60811-605:2012)
123 EN 62219, Overhead electrical conductors - Formed wire, concentric lay, stranded conductors
124 (IEC 62219)
125 EN 62230, Electric cables - Spark-test method (IEC 62230)
126 HD 605 S3:2019, Electric cables - Additional test methods
127 IEC 60502-2:2014, Power cables with extruded insulation and their accessories for rated voltages from 1
128 kV (Um = 1,2 kV) up to 30 kV (Um = 36 kV) – Part 2: Cables for rated voltages from 6 kV (Um = 7,2 kV)
129 up to 30 kV (Um = 36 kV)
———————
1
As impacted by EN 60811-401:2012/A1:2017.
2
As impacted by EN 60811-501:2012/A1:2018.
3
As impacted by EN 60811-508:2012/A1:2017.
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130 3 Definitions
131 For the purpose of this document, the following definitions apply.
132 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
133 • IEC Electropedia: available at http://www.electropedia.org/
134 • ISO Online browsing platform: available at http://www.iso.org/obp
135 3.1 Definitions relating to tests
136 3.1.1
137 type tests
138 T
139 tests required to be made before supplying a type of product covered by this document on a general
140 commercial basis in order to demonstrate satisfactory performance characteristics to meet the intended
141 application
142 Note 1 to entry: These tests are of such nature that, after they have been made, they need not be
143 repeated unless changes are made in the material, design or manufacturing process which might change
144 the performance characteristics
145 3.1.2
146 sample tests
147 S
148 tests made on samples of completed product or components taken from the completed product adequate
149 to verify that the finished product meets the design specifications
150 3.1.3
151 routine tests
152 R
153 tests made on all production lengths to demonstrate their integrity
154 3.2
155 rated voltage
156 the reference voltage for which the conductor is designed and which serves to define the electrical tests
157 Note 1 to entry: The rated voltage is expressed by the value U, expressed in kilovolts, where U is the r.m.s. value
158 between any two-phase conductors.
159 4 Covered conductors
160 4.1 Code designation
161 Covered conductors shall be designated as follows:
Type code CC;
Covering material S (for semi-conductive conductor screen, if any),
X (for cross-linked polyethylene),
T (for thermoplastic polyethylene);
Conductor material and cross-section according to EN 50182;
Conductor design W (for watertight),
K (for compacted);
Rated voltage U in kV
…kV.
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162 EXAMPLE 1 OF DESIGNATION
163 “CCX 66-AL3 WK 20kV” is a XLPE-covered conductor with a rated voltage of 20 kV, longitudinal
164 watertight compacted conductor of aluminium alloy AL3 and a nominal conductor cross-section of
2
165 66 mm .
166 EXAMPLE 2 OF DESIGNATION
167 “CCST 66-A3F W 20 kV” is a thermoplastic polyethylene covered conductor with a rated voltage of 20 kV,
168 longitudinal watertight conductor with formed aluminium alloy wire AF3 and a nominal conductor cross-
2
169 section of 66mm .
170 4.2 Construction requirements
171 4.2.1 Conductor
Number of 1
conductors:
Conductor material: aluminium alloy or steel reinforced aluminium
2 2
Nom. cross-section: 25 mm to 400 mm for all conductors
Conductor design: the conductors may be compacted or non-compacted, with round wire or
profiled wire.
172 Information on bare conductors with round wires in frequent use can be found in the national lists,
173 contained in EN 50182:2001, Annex F. However, for the purpose of this document, conductors may be
174 selected from any national table. Conductors deviating in design from the standard values shall be given
175 by the manufacturer, but fulfilling all requirements given in EN 50182.
176 Information about conductors made from profiled wires shall be provided by the manufacturer.
177 Non-compacted conductors shall comply with EN 50182 or EN 62219 (with the exception of the filling, if
178 any).
179 For compacted conductors, based on conductors according to EN 50182, the following paragraph
180 applies:
181 The outer diameter of the compacted conductor shall be 95 % (±1 % for 7 and 19-wire
182 constructions, ± 1,5 % for 37-wire constructions) of the diameter given in EN 50182. The rated tensile
183 strength (RTS) shall be at least 95 % of the value given in EN 50182. The DC resistance shall not exceed
184 the value given in EN 50182 by more than 5 %.
185 4.2.2 Filling
186 The stranded conductor may be longitudinally watertight by means of adequate measures as e.g. filling
187 with an adequate mass. The filling mass or other materials for obtaining the longitudinal watertightness,
188 shall be compatible with the conductor material and the material of the covering (see Table 2).
189 4.2.3 Covering
190 The covering shall consist of a cross-linked polyethylene compound, which shall comply with the
191 requirements according to Table 1, column 3 or of a thermoplastic polyethylene compound, complying
192 with the requirements according Table 1, column 4.
193 It shall be possible to remove the covering without damage to the conductor.
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194 Table 1 — Properties of the covering materials
1 2 3 4
Unit
Compound designation X T
Basic material XLPE PE
Maximum operating temperature of the °C a 70
90
conductor
Mechanical properties
before ageing on sample
(EN 60811-501:2012, 4.2)
minimum tensile strength MPa 12,5 12,5
minimum elongation at break % 200 300
after ageing on sample (of
4
EN 60811-401:2012 , 4.2.3.2)
Temperature °C 135 110
Duration h 168 336
minimum tensile strength MPa - 12,5
maximum variation T1/T0 % ± 25 -
minimum elongation at break % - 300
maximum variation T1/T0 % ± 25 -
b
after ageing on complete product sample
5
(EN 60811-401:2012 , 4.2.3.4)
Temperature °C 100 ± 2 100 ± 2
Duration h 168 168
minimum tensile strength MPa - 12,5
maximum variation T2/T0 % ± 25 -
minimum elongation at break % - 300
maximum variation T2/T0 % ± 25 -
Physical and chemical properties
hot set test (EN 60811-507)
temperature °C 200 -
duration min 15 -
mechanical stress MPa 0,2 -
maximum elongation under load % 175 -
maximum residual elongation % 15 -
pressure test at high temperature
6
(EN 60811-508:2012 , 4.3)
———————
4
As impacted by EN 60811-401:2012/A1:2017.
5
As impacted by EN 60811-401:2012/A1:2017.
6
As impacted by EN 60811-508:2012/A1:2017.
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1 2 3 4
Unit
temperature °C - 80
duration h - 4
coefficient k - - 0,8
maximum depth of indentation % - 50
Gravimetric water absorption
(EN 60811-402)
temperature °C 85 85
duration h 336 336
2
maximum variation of mass mg/cm 1 1
shrinkage test (EN 60811-502)
distance L between marks mm 200 200
duration h 1 1
temperature °C 130 ± 3 100 ± 3
maximum shrinkage % 4 4
Shore D hardness (HD 605 S3:2019, 2.2.1)
minimum hardness ShD - 55
a
Maximum operating temperature of the conductor is limited to 80 °C due to mechanical reasons.
b
For use together with watertight conductors only. Adequate measures e.g. neutral capping to prevent
leakage of filling material shall be taken.
195 An UV-protection shall be provided. Covering materials having a content of carbon black of (2,5 ± 0,5) %
196 are considered to have adequate protection. Otherwise protection against UV shall be demonstrated
197 fulfilling the UV-test specified in Chapter 6, Table 2, No.4.3.
198 The nominal thickness of the covering shall be calculated according to the following formula:
199 S = 0,11 U
200 where
S is the nominal thickness of the covering in mm (rounded to one decimal place);
U
is the rated voltage (see 3.2) in kV.
201 The nominal thickness of the covering shall be not less than 2,3 mm.
202 The minimum thickness of the covering at any place shall not be less than the nominal value by more
203 than (0,1 mm + 10 % of the nominal value). The mean value of the thickness of the covering shall not
204 exceed the nominal value by more than (0,1 mm + 10 % of the nominal value).
205 A semi-conductive conductor screen, if any, shall not be measured as covering thickness.
206 The covering shall be applied onto the conductor by extrusion of one or more material layers. In screened
207 versions (constructions), the extruded conductor screen should permanently connect to the closest layer
208 of insulation.
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209 5 Marking
210 5.1 Indication of origin
211 Covered conductors shall be provided with an identification of origin consisting of a continuous marking of
212 the manufacturer’s name or trademark on the surface of the covering. This marking shall be made by
213 embossing.
214 5.2 Continuity of marks
215 The distance between the end of a mark and the beginning of the next identical mark shall not exceed
216 1 000 mm.
217 Figure 1 below shows an example of the marking, where the word “ORIGIN” stands for the mandatory
218 information required in 5.1 and “XYZ” stands for one of any other mandatory marks required in 5.3.
219
220 Figure 1 — Example of marking
221 5.3 Other markings
222 Covered conductors shall be equipped with a continuous embossing as follows:
223 — code designation according to 4.1;
224 — year of production;
225 — standard number.
226 Optional markings (e.g. slippage factor according to Annex C, meter marking) may be added upon
227 agreement between manufacturer and user. These optional markings may be made by printing or
228 embossing.
229 5.4 Durability
230 Printed markings shall be durable. Durability shall be checked by the test according to HD 605 S3:2019,
231 2.5.4. The markings shall be legible after this test.
232 5.5 Legibility
233 All markings shall be clearly legible. Printed markings shall be in contrasting colours.
234 6 Tests
235 The compliance with the requirements according to 4.2 and Clause 5 shall be established by visual
236 examination and the tests listed in Table 2.
237 A type test shall be performed on every covered conductor type, irrespective of the cross sectional area.
238 The results will be valid across the whole range of cross sectional areas for that type.
239 The slippage test shall be performed on each cross sectional area (see C.3.1).
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240 Table 2 — Tests
1 2 3 4 5
No Tests Catego Requireme Test
ry of nts methods
tests
1 Electrical tests
1.1 Conductor resistance T, HD 605
a
b S3:2019, 3.1.1
S
1.2 High voltage test
1.2.1 — for CC without conductor screen: no HD 605
breakdown S3:2019,
3.2.2.2
Test voltage (a.c.) 1 U
Number of specimen 1
Length of specimen (minimum) 5 m
Duration of immersion in water (minimum) 1 h
Temperature of water (20 ± 5) °C
Test duration 15 min S
3 h T
1.2.2 — for CC with conductor screen or upon agreement no HD 605
between customer and producer: breakdown S3:2019,
3.2.2.2
Test voltage (AC) 1 U
Number of specimen 1
Length of specimen (minimum) 5 m
Duration of immersion in water (minimum) 1 h
Temperature of water (20 ± 5) °C
Test duration 4 h S
48 h T
1.3 c R no EN 62230
Spark test on the covering
breakdown
Test voltage: AC 0,7 U or
DC 1 U
1.4 Leakage current T maximum Annex A
1 mA
Test voltage (AC) 0,7 U
1.5 d T Annex B Annex B
Tracking resistance
2 Construction and dimensions
2.1 Compliance with the design requirements T, S, R 4.2 visual
inspection
2.2 Thickness of the covering T, S, R 4.2.3 EN 60811-201
3 Construction and mechanical properties of the
conductor
3.1 Rated tensile strength b a a
T, S
3.2 Construction and dimensions T, S a a
4
...
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