SIST EN 50397-2:2022
(Main)Covered conductors for overhead lines and the related accessories for rated voltages above 1 kV a.c. and not exceeding 36 kV a.c. - Part 2: Accessories for covered conductors - Tests and acceptance criteria
Covered conductors for overhead lines and the related accessories for rated voltages above 1 kV a.c. and not exceeding 36 kV a.c. - Part 2: Accessories for covered conductors - Tests and acceptance criteria
This Part 2 of EN 50397 contains the requirements for accessories that are for use with the covered conductors in accordance with EN 50397 1. They are for applications in overhead lines with rated voltages U above 1 kV a.c. and not exceeding 36 kV a.c.
NOTE This document describes the requirements and tests only for the accessories installed on the covered conductor itself.
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung - Teil 2: Armaturen für kunststoffumhüllte Freileitungsseile - Prüfungen und Anforderungen
Dieses Dokument beinhaltet die Anforderungen an Armaturen, die für kunststoffumhüllte Freileitungsseile nach EN 50397-1 verwendet werden. Sie werden bei Freileitungen mit einer Bemessungsspannung U über 1 kV Wechselspannung bis max. 36 kV Wechselspannung eingesetzt.
ANMERKUNG Dieses Dokument beschreibt die Anforderungen und Prüfungen nur für die Armaturen, die an der Freileitung selbst montiert sind.
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 2: Accessoires pour conducteurs gainés - Exigences et essais
La présente Partie 2 de l'EN 50397 contient les exigences relatives aux accessoires destinés aux conducteurs gainés conformes à l'EN 50397 1. Elle est applicable aux lignes aériennes de tensions assignées U supérieures à 1 kV en courant alternatif et ne dépassant pas 36 kV en courant alternatif.
NOTE Le présent document décrit les exigences et les essais exclusivement pour les accessoires installés sur les conducteurs gainés eux-mêmes.
Oplaščeni vodniki za nadzemne vode in ustrezni pribor za naznačene izmenične napetosti nad 1 kV, ki ne presegajo 36 kV - 2. del: Pribor za oplaščene vodnike - Preskusi in prevzemni pogoji
V tem 2. delu standarda EN 50397 so zahteve za pribor, ki je namenjen uporabi z oplaščenimi vodniki v skladu s standardom EN 50397-1. Uporablja se v nadzemnih vodih z naznačenimi izmeničnimi napetostmi nad 1 kV, ki ne presegajo 36 kV.
OPOMBA: Ta dokument opisuje zahteve in preskuse zgolj za pribor, ki je nameščen na oplaščenem vodniku.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50397-2:2022
01-oktober-2022
Nadomešča:
SIST EN 50397-2:2010
Oplaščeni vodniki za nadzemne vode in ustrezni pribor za naznačene izmenične
napetosti nad 1 kV, ki ne presegajo 36 kV - 2. del: Pribor za oplaščene vodnike -
Preskusi in prevzemni pogoji
Covered conductors for overhead lines and the related accessories for rated voltages
above 1 kV a.c. and not exceeding 36 kV a.c. - Part 2: Accessories for covered
conductors - Tests and acceptance criteria
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit
Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung - Teil 2:
Armaturen für kunststoffumhüllte Freileitungsseile - Prüfungen und Anforderungen
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 2: Accessoires pour conducteurs gainés - Exigences et essais
Ta slovenski standard je istoveten z: EN 50397-2:2022
ICS:
29.060.20 Kabli Cables
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 50397-2:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50397-2:2022
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SIST EN 50397-2:2022
EUROPEAN STANDARD EN 50397-2
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2022
ICS 29.240.20 Supersedes EN 50397-2:2009
English Version
Covered conductors for overhead lines and the related
accessories for rated voltages above 1 kV a.c. and not
exceeding 36 kV a.c. - Part 2: Accessories for covered
conductors - Tests and acceptance criteria
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 2: Armaturen für
alternatif - Partie 2: Accessoires pour conducteurs gainés - kunststoffumhüllte Freileitungsseile - Prüfungen und
Essais et critères d'acceptation Anforderungen
This European Standard was approved by CENELEC on 2022-06-27. 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,
Türkiye 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
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50397-2:2022 E
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 8
4.1 General requirements . 8
4.2 Specific requirements for fittings used on covered conductor . 9
4.3 Marking . 10
5 Quality assurance . 10
6 Classification of tests – Type tests, sample tests, routine tests . 10
6.1 Type tests . 10
6.2 Sample tests . 11
6.3 Routine tests . 11
7 Tests . 11
7.1 General . 11
7.2 Visual examination . 12
7.3 Dimensional and material verification . 12
7.4 Test for permanent marking . 12
7.5 Mechanical tests . 12
7.6 Hot dip galvanizing test . 29
7.7 Water tightness test . 29
7.8 Electrical ageing test for connectors and Joints . 30
7.9 Short-circuit test on APD or EPD . 30
7.10 Power arc test . 31
7.11 Environmental test for suspension and tension clamps . 32
7.12 Environmental tests for connectors and joints . 35
7.13 Endurance test for joints (optional) . 36
Annex A (normative) Type tests, sample tests and routine tests . 37
Annex B (informative) Example of sampling with inspection by attributes . 39
Annex C (informative) Example of sampling with inspection by variable . 40
Annex D (normative) Special national conditions . 41
Bibliography . 42
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
Figures
Figure 1 — Test arrangement for damage and failure load test . 13
Figure 2 — Test arrangement of slip test at ambient temperature . 14
Figure 3 — Slip test arrangement at low temperature . 16
Figure 4 — Lift and side load test . 18
Figure 5 — Tensile test arrangement . 20
Figure 6 — Arrangement for the low temperature zone . 21
Figure 7 — Test arrangement . 26
Figure 8 — Mechanical stresses on earth parking device . 28
Figure 9 — Test arrangement for water tightness test . 30
Figure 10 — Resistance measurement . 31
Figure 11 — Example of power arc test arrangement for arc protection system . 32
Tables
Table 1 — Specified minimum loads . 18
Table A.1 . 37
3
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
European foreword
This document (EN 50397-2:2022) has been prepared by CLC/TC 20 “Electric cables”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2023-06-27
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2025-06-27
conflicting with this document have to be
withdrawn
This document will supersede EN 50397-2:2009 and all of its amendments and corrigenda (if any).
EN 50397-2:2022 has been updated editorially with respect to EN 50397-2:2009.
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.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
Introduction
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 must 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 50397-2:2022
EN 50397-2:2022 (E)
1 Scope
This document contains the requirements for accessories that are for use with covered conductors, see
EN 50397-1. They are for applications in overhead lines with rated voltages U above 1 kV a.c. and not
exceeding 36 kV a.c.
NOTE This document describes the requirements and tests only for the accessories installed on the covered conductor
itself.
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 50397-1:2020, 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
EN 50483-5, Test requirements for low voltage aerial bundled cable accessories — Part 5: Electrical ageing
test
EN 50483-6:2009, Test requirements for low voltage aerial bundled cable accessories — Part 6: Environmental
testing
EN 61284:1997, Overhead lines — Requirements and tests for fittings
EN 61467, Insulators for overhead lines - Insulator strings and sets for lines with a nominal voltage greater than
1 000 V — AC power arc tests
EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test
methods (ISO 1461)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 2859-2, Sampling procedures for inspection by attributes — Part 2: Sampling plans indexed by limiting
quality (LQ) for isolated lot inspection
ISO 3951 (series), Sampling procedures for inspection by variables
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
type test
test 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: Symbol T.
Note 2 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.
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EN 50397-2:2022 (E)
3.2
sample test
test made on samples of completed product or components taken from the completed product adequate to
verify, that the finished product meets the design specifications
Note 1 to entry: Symbol S.
3.3
routine test
test intended to prove conformance of fittings to specific requirements and made on every fitting
Note 1 to entry: Symbol R.
3.4
rated voltage
reference voltage (U), for which it 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 kV, where U is the r.m.s. value between any
two phase conductors.
3.5
ambient temperature
temperature from 15 °C to 30 °C
3.6
factory-formed helical conductor fitting
fitting consisting of helically formed wires which provide the force necessary to grip the conductor by self-
tightening
3.7
tension clamp
device which firmly attaches a covered conductor to a support and is designed to transmit the specified
mechanical tension in the conductor to the supporting structure
[SOURCE: IEV 461-18-01, modified]
3.8
tension joint
mid-span sleeve designed to joint two lengths of tensioned conductor
3.9
non-tension joint
sleeve designed to joint two lengths of non-tensioned conductor
3.10
suspension clamp
device which attaches a covered conductor to a support in order to carry its weight and any specified load
[SOURCE: IEV 461-18-02, modified]
3.11
top clamp
device to clamp the covered conductor on the top of a pin or line post insulator in order to carry its weight and
any specified load
7
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
3.12
branch connector
metallic device for connecting a branch conductor to a main conductor at an intermediate point on the latter
[SOURCE: IEV 461-17-05]
3.13
arc protection device
APD
metallic device installed on the conductor or on accessories to protect the conductor against the possible arcs
3.14
arc protection system
assembly of arc protection devices, insulators and conductor, including all needed accessories
3.15
earth parking device
EPD
device installed on the conductor to allow temporary earthing
3.16
specified minimum slip load
SMSL
minimum load specified by the purchaser or declared by the supplier at which slippage will not take place
3.17
specified minimum failure load
SMFL
minimum load specified by the purchaser or declared by the supplier at which mechanical failure will not take
place
Note 1 to entry: From the probabilistic point of view, the specified minimum failure load corresponds to the value having
the probability of e % in the distribution function of the strength of the fitting. The exclusion limit e % is usually taken within
2 % to 5 % with 10 % being the upper limit (see IEC 60826).
3.18
minimum breaking load
MBL
minimum breaking load of the conductor given by the manufacturer
Note 1 to entry: If not defined in EN 50397-1.
4 Requirements
4.1 General requirements
4.1.1 General
General requirements shall be according to EN 61284:1997, 4.1.
Other accessories should be resistant against corrosion and environmental ageing.
4.1.2 Speed of load application
For all mechanical tests, the load increase shall be carried out smoothly with a tension machine and the rate of
the load increase shall be between 5 000 N/min and 7 500 N/min for mechanical accessories and 1 000 N/min
to 5 000 N/min for connectors.
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
4.2 Specific requirements for fittings used on covered conductor
4.2.1 General
The piercing part or element of any accessories shall not decrease the mechanical strength of the conductor
below than 90 % of the minimum breaking load (MBL) of the conductor. All accessories are watertight, they
shall prevent moisture ingress in the conductor. The water tightness shall be tested according to 7.7.
The intended piercing of the cover is not considered as a damage caused by the fitting.
4.2.2 Tension clamps
For the purpose of terminating covered conductors over the covering fitting shall include, but are not limited to,
the following:
— cone, bolted or wedge type clamp;
— preformed helical fittings.
The fittings shall be able to withstand the specific minimum failure load (SMFL) and shall not damage the
covering and shall be designed to prevent the ingress of moisture during service.
“shall not damage the covering” means no damage shall occur which could affect the correct function of the
covering.
4.2.3 Suspension and top clamps
Fittings for the purpose of suspension over the covering include, but are not limited to the following:
— top-clamps;
— pre-formed helical fittings;
— suspension clamp according to EN 61284:1997, 11.4.
The fittings shall not damage the covering and shall be designed to prevent the ingress of moisture during
service.
“shall not damage the covering” means no damage shall occur which could affect the correct function of the
covering.
The suspension clamps shall be so designed that the effects of vibration, both on the covered conductor and
on the clamps themselves, are minimized. The clamps shall be designed to avoid localized pressure or damage
to the covered conductor.
If needed the suspension clamps shall have sufficient current carrying capability to avoid damage by fault
currents.
The wear resistance of the articulation assembly shall be sufficient to prevent deterioration in service.
4.2.4 Connectors for piercing the covering
Connectors shall be capable of carrying the load current, and fault current if any.
4.2.5 Arc protection devices
These protection devices are designed to protect insulator sets and covered conductors against damage caused
by power arcs (arcing horns, arcing rings).
The maximum short-circuit current shall be 10 kA for 1 s.
This device shall be delivered with an installation instruction. It shall include the description of the conditions for
installation of arc protection system in order this whole installation withstands the arc power test at 1 kA and
10 kA.
9
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EN 50397-2:2022 (E)
The arc protective devices shall withstand a mechanical load in order to support the installation strengths.
4.2.6 Earth parking devices
The earth parking device shall be capable of carrying the short circuit current. The maximum short circuit current
shall be 10 kA for 1 s.
These fittings shall withstand a mechanical load in order to support the installation strengths.
4.2.7 Joint
The joint shall be suitable for the covered conductor for which they are designed.
The joint shall have the same basic insulation properties as the conductor covering. In this case, the test shall
by carried out according to EN 50397-1:2020, Table 2, ref. 1.2 “High voltage test”. The conductor shall have a
sufficient length so that the joint is immersed and the test duration shall be same as for sample test.
4.3 Marking
All products mentioned above shall permanently bear:
— manufacturer’s trade mark or logo;
— product code or reference;
— traceability code / batch number;
— the minimum and maximum cross section for which the unit is suitable;
— tightening torque or die reference, if applicable;
— recycling code, if any.
Other specific markings should be agreed between customer and manufacturer.
A test for marking is provided in 7.4.
5 Quality assurance
A quality assurance programme taking into account the requirements of this document can be used by
agreement between the purchaser and the supplier to verify the quality of the fittings during the manufacturing
process.
NOTE Detailed information on the use of quality assurance is given in EN ISO 9000, and other standards in the same
series.
6 Classification of tests – Type tests, sample tests, routine tests
6.1 Type tests
6.1.1 General
Type tests are intended to establish design characteristics. They are normally only made once and repeated
only when the design or the material of the fitting is changed. The results of type tests are recorded as evidence
of compliance with design requirements.
6.1.2 Application
Fittings shall be subject to type tests in accordance with Table A.1.
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EN 50397-2:2022 (E)
6.2 Sample tests
6.2.1 General
Sample tests are intended to verify the quality of materials and workmanship.
6.2.2 Application
Overhead line fittings shall be subjected to sample tests as listed in Table A.1. The samples to be tested shall
be selected at random from the lot offered for acceptance. The purchaser has the right to make the selection.
6.2.3 Sampling and acceptance criteria
Unless otherwise agreed between purchaser and supplier, the sampling plan procedures according to
ISO 2859-1, ISO 2859-2 (inspection by attributes) and to the ISO 3951 series (inspection by variables) shall be
applied.
For each sample test, the type of inspection (by attributes or by variables) and the detailed procedures
(inspection level, acceptable quality level, single, double or multiple sampling, etc.) shall be agreed between
purchaser and supplier (see example in Annex B for inspection by attributes, and Annex C for inspection by
variables).
NOTE Sampling inspection by variables is an acceptance sampling procedure to be used in place of inspection by
attributes when it is more appropriate to measure on some continuous scale the characteristic(s) under consideration. In the
case of failure load tests and similar expensive tests, better discrimination between acceptable quality and objective quality
is available with acceptance sampling by variables than by attributes for the same sample size.
The purpose of the sampling process may also be important in the choice between a variables or attributes
plan.
For example, a purchaser may choose to use an attributes acceptance sampling plan to ensure that parts in a
shipment lot are within a required dimensional tolerance; the manufacturer may make measurements under a
variables sampling plan of the same dimensions because he is concerned with gradual trends or changes which
may affect his ability to provide shipment lots which meet the AQL.
6.3 Routine tests
6.3.1 General
Routine tests are intended to prove conformance of fittings to specific requirements and are made on every
fitting. The tests shall not damage the fitting.
6.3.2 Application and acceptance criteria
The compliance with the requirements according to Clause 4 shall be established by the tests listed in Table A.1.
The tests are only for fittings which are clamping the conductor over the covering.
7 Tests
7.1 General
Three samples of fittings or clamps shall be tested, except when the specific subclause requires another
number.
Annex A provides a table of the general tests required for each product.
NOTE This clause defines only the tests for fittings used over the covering.
For fittings directly used on conductor itself, see EN 61284.
11
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EN 50397-2:2022 (E)
7.2 Visual examination
This test shall include visual examination to ascertain conformity of the fittings, in all essential respects, with the
contract drawings. Deviations from the drawings shall be subject to an agreement between supplier and
purchaser and shall be appropriately documented as an agreed concession.
7.3 Dimensional and material verification
These tests shall include verification of dimensions, to ensure that fittings are within the dimensional tolerances
stated on contract drawings. The purchaser may choose to witness the measurement of selected dimensions
or may inspect the supplier's documentation when this is available. Measuring devices/gauges shall be selected
with regard to the required precision and accuracy. Documentary evidence of calibration of such devices shall
be provided on request.
Routine tests shall include a specified level of dimensional checking when required by the contract quality plan.
Particular attention should be given to those dimensions potentially affecting fitting interchange ability (for
example ball and socket couplings (HD 474); clevis and tongue couplings (IEC 60471)) or mechanical and/or
electrical performance.
7.4 Test for permanent marking
7.4.1 Principle
This test shall be carried out according to the procedures of EN 50483-1:2009, 9.2.
This test ensures that the marking of accessories is readable and durable.
7.4.2 Test arrangement
Two samples shall be tested.
7.4.3 Procedure
The marking shall be rubbed by hand for 15 s with a piece of cloth soaked with water and again for 15 s with a
piece of cloth soaked with petroleum spirit.
NOTE Petroleum spirit is defined as the aliphatic solvent hexane with a content of aromatics of maximum 0,1 % by
3
volume, a kauri-butanol value of 29, initial boiling point of 65 °C, a dry point of 69 °C and a specific gravity of 0,68 g/cm .
7.4.4 Requirement
The marking shall remain clear and allow the accessory to be easily identified.
7.5 Mechanical tests
7.5.1 General
Number of fittings to be tested:
— type tests: mechanical type tests shall be carried out on three fittings. All fittings shall pass the test;
— sample tests: mechanical sample tests shall be carried out according to the procedures in EN 61284:1997,
6.2.3.
7.5.2 Damage and failure load test for tension and suspension clamps
(without helical fittings)
7.5.2.1 Principle
This test shall be carried out to ensure that the clamps are capable of sustaining loads without permanent
deformation, which may affect the proper function of the clamp.
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SIST EN 50397-2:2022
EN 50397-2:2022 (E)
7.5.2.2 Test arrangement
The test shall be carried out as in Figures 1a, 1b, 1c, 1d or according to an equivalent scheme. Armour rods
shall be applied to the covered conductor if any are used in service.
7.5.2.3 Procedure
The number of fittings tested, the method for increasing the load during the test and the method for evaluating
the test results shall be those stated in EN 61284:1997, 11.3.1. The angle α and the angle β, at the minimum
damage load shall be the maximum design angle specified by the supplier.
a)
b)
c)
Key
1 Specified mechanical minimum damage load (T)
2 Load (R)
3 Side Load (R2)
4 Liftload (R1)
α Max. design angle
β Max. design angle
Figure 1 — Test arrangement for damage and failure load test
7.5.2.4 Acceptance criteria
Regarding damage load, the test is passed if no permanent deformation, which can affec
...
SLOVENSKI STANDARD
oSIST prEN 50397-2:2021
01-oktober-2021
Oplaščeni vodniki za nadzemne vode in ustrezen pribor za naznačene izmenične
napetosti nad 1 kV, ki ne presegajo 36 kV - 2. del: Pribor za oplaščene vodnike -
Preskusi in prevzemni pogoji
Covered conductors for overhead lines and the related accessories for rated voltages
above 1 kV a.c. and not exceeding 36 kV a.c. - Part 2: Accessories for covered
conductors - Tests and acceptance criteria
Kunststoffumhüllte Leiter und zugehörige Armaturen für Freileitungen mit
Nennspannungen über 1 kV und nicht mehr als 36 kV Wechselspannung - Teil 2:
Armaturen für kunststoffumhüllte Freileitungsseile - Prüfungen und Anforderungen
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 2: Accessoires pour conducteurs gainés - Exigences et essais
Ta slovenski standard je istoveten z: prEN 50397-2
ICS:
29.060.20 Kabli Cables
29.240.20 Daljnovodi Power transmission and
distribution lines
oSIST prEN 50397-2:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50397-2:2021
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oSIST prEN 50397-2:2021
EUROPEAN STANDARD DRAFT
prEN 50397-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2021
ICS 29.240.20 Will supersede EN 50397-2:2009 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 a.c. and not
exceeding 36 kV a.c. - Part 2: Accessories for covered
conductors - Tests and acceptance criteria
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 2: Armaturen für
alternatif - Partie 2: Accessoires pour conducteurs gainés - kunststoffumhüllte Freileitungsseile - Prüfungen und
Exigences et essais Anforderungen
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2021-11-05.
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
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 73238 Ref. No. prEN 50397-2 E
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1 Contents Page
2 European foreword . 4
3 Introduction . 5
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 6
7 4 Requirements . 8
8 4.1 General requirements . 8
9 4.2 Specific requirements for fittings used on covered conductor . 9
10 4.3 Marking . 10
11 5 Quality assurance . 10
12 6 Classification of tests – Type tests, sample tests, routine tests . 10
13 6.1 Type tests . 10
14 6.2 Sample tests . 11
15 6.3 Routine tests . 11
16 7 Tests . 11
17 7.1 General . 11
18 7.2 Visual examination . 12
19 7.3 Dimensional and material verification . 12
20 7.4 Test for permanent marking . 12
21 7.5 Mechanical tests . 12
22 7.6 Hot dip galvanizing test . 29
23 7.7 Water tightness test . 29
24 7.8 Electrical ageing test for connectors and Joints . 30
25 7.9 Short-circuit test on APD or EPD . 30
26 7.10 Power arc test . 31
27 7.11 Environmental test for suspension and tension clamps . 32
28 7.12 Environmental tests for connectors and joints . 35
29 7.13 Endurance test for joints (optional) . 36
30 Annex A (normative) Type tests, sample tests and routine tests . 37
31 Annex B (informative) Example of sampling with inspection by attributes . 39
32 Annex C (informative) Example of sampling with inspection by variable . 40
33 Annex D (normative) Special national conditions . 41
34 Bibliography . 42
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35 Figures
36 Figure 1 — Test arrangement for damage and failure load test . 14
37 Figure 2 — Test arrangement of slip test at ambient temperature . 14
38 Figure 3 — Slip test arrangement at low temperature . 16
39 Figure 4 — Lift and side load test . 18
40 Figure 5 — Tensile test arrangement . 20
41 Figure 6 — Arrangement for the low temperature zone . 21
42 Figure 7 — Test arrangement . 26
43 Figure 8 — Mechanical stresses on earth parking device . 28
44 Figure 9 — Test arrangement for water tightness test . 30
45 Figure 10 — Resistance measurement . 31
46 Figure 11 — Example of power arc test arrangement for arc protection system . 32
47 Tables
48 Table 1 — Specified minimum loads . 18
49 Table A.1 . 37
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50 European foreword
51 This document (prEN 50397-2:2021) has been prepared by CLC/TC 20 “Electric cables”.
52 This document is currently submitted to the Enquiry.
53 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)
54 This document will supersede EN 50397-2:2009 and all of its amendments and corrigenda (if any).
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55 Introduction
56 Covered conductors consist of a conductor surrounded by a covering made of insulating material as protection
57 against accidental contacts with other covered conductors and with grounded parts such as tree branches, etc.
58 In comparison with insulated conductors, this covering has reduced properties, but is able to withstand the
59 phase-to-earth voltage temporarily.
60 Since covered conductors are unscreened, they are not touch-proof, i.e. they must be treated as bare
61 conductors with respect to electric shock.
62 This document does not cover aspects related to the installation of overhead lines such as determination of
63 clearances, spans, sags, etc.
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64 1 Scope
65 This Part 2 of EN 50397 contains the requirements for accessories that are for use with the covered conductors
66 in accordance with EN 50397-1. They are for applications in overhead lines with rated voltages U above
67 1 kV a.c. and not exceeding 36 kV a.c.
68 NOTE This document describes the requirements and tests only for the accessories installed on the covered conductor
69 itself.
70 2 Normative references
71 The following documents are referred to in the text in such a way that some or all of their content constitutes
72 requirements of this document. For dated references, only the edition cited applies. For undated references, the
73 latest edition of the referenced document (including any amendments) applies.
74 EN 50397-1:2020, Covered conductors for overhead lines and the related accessories for rated voltages above
75 1 kV a.c. and not exceeding 36 kV a.c. - Part 1: Covered conductors
76 EN 50483-5, Test requirements for low voltage aerial bundled cable accessories - Part 5: Electrical ageing test
77 EN 50483-6:2009, Test requirements for low voltage aerial bundled cable accessories - Part 6: Environmental
78 testing
79 EN 61284:1997, Overhead lines - Requirements and tests for fittings (IEC 61284:1997)
80 EN 61467, Insulators for overhead lines - Insulator strings and sets for lines with a nominal voltage greater than
81 1 000 V - AC power arc tests (IEC 61467)
82 EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles - Specifications and test methods
83 (ISO 1461)
84 ISO 2859-1, Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by
85 acceptance quality limit (AQL) for lot-by-lot inspection
86 ISO 2859-2, Sampling procedures for inspection by attributes - Part 2: Sampling plans indexed by limiting quality
87 (LQ) for isolated lot inspection
88 ISO 3951 (series), Sampling procedures for inspection by variables
89 3 Terms and definitions
90 For the purposes of this document, the following terms and definitions apply.
91 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
92 — ISO Online browsing platform: available at https://www.iso.org/obp
93 — IEC Electropedia: available at http://www.electropedia.org/
94 3.1
95 type test
96 test required to be made before supplying a type of product covered by this document on a general commercial
97 basis in order to demonstrate satisfactory performance characteristics to meet the intended application
98 Note 1 to entry: Symbol T.
99 Note 2 to entry: These tests are of such nature that, after they have been made, they need not be repeated unless changes
100 are made in the material, design or manufacturing process, which might change the performance characteristics.
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101 3.2
102 sample test
103 test made on samples of completed product or components taken from the completed product adequate to
104 verify, that the finished product meets the design specifications
105 Note 1 to entry: Symbol S.
106 3.3
107 routine test
108 test intended to prove conformance of fittings to specific requirements and made on every fitting
109 Note 1 to entry: Symbol R.
110 3.4
111 rated voltage
112 reference voltage (U), for which it is designed and which serves to define the electrical tests
113 Note 1 to entry: The rated voltage is expressed by the value U expressed in kV, where U is the r.m.s. value between any
114 two phase conductors.
115 3.5
116 ambient temperature
117 temperature from 15 °C to 30 °C
118 3.6
119 factory-formed helical conductor fitting
120 fitting consisting of helically formed wires which provide the force necessary to grip the conductor by self-
121 tightening
122 3.7
123 tension clamp
124 device which firmly attaches a covered conductor to a support and is designed to transmit the specified
125 mechanical tension in the conductor to the supporting structure
126 [SOURCE: IEV 461-18-01, modified]
127 3.8
128 tension joint
129 mid-span sleeve designed to joint two lengths of tensioned conductor
130 3.9
131 non-tension joint
132 sleeve designed to joint two lengths of non tensioned conductor
133 3.10
134 suspension clamp
135 device which attaches a covered conductor to a support in order to carry its weight and any specified load
136 [SOURCE: IEV 461-18-02 modified]
137 3.11
138 top clamp
139 device to clamp the covered conductor on the top of a pin or line post insulator in order to carry its weight and
140 any specified load
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141 3.12
142 branch connector
143 metallic device for connecting a branch conductor to a main conductor at an intermediate point on the latter
144 [SOURCE: IEV 461-17-05]
145 3.13
146 arc protection device
147 APD
148 metallic device installed on the conductor or on accessories to protect the conductor against the possible arcs
149 3.14
150 arc protection system
151 assembly of arc protection devices, insulators and conductor, including all needed accessories
152 3.15
153 earth parking device
154 EPD
155 device installed on the conductor to allow temporary earthing
156 3.16
157 specified minimum slip load
158 SMSL
159 minimum load specified by the purchaser or declared by the supplier at which slippage will not take place
160 3.17
161 specified minimum failure load
162 SMFL
163 minimum load specified by the purchaser or declared by the supplier at which mechanical failure will not take
164 place
165 Note 1 to entry: From the probabilistic point of view, the specified minimum failure load corresponds to the value having
166 the probability of e % in the distribution function of the strength of the fitting. The exclusion limit e % is usually taken within
167 2 % to 5 % with 10 % being the upper limit (see IEC 60826).
168 3.18
169 minimum breaking load
170 MBL
171 minimum breaking load of the conductor given by the manufacturer if not defined in EN 50397-1
172 4 Requirements
173 4.1 General requirements
174 4.1.1 General
175 General requirements shall be according to EN 61284:1997, 4.1.
176 Other accessories should be resistant against corrosion and environmental ageing.
177 4.1.2 Speed of load application
178 For all mechanical tests, the load increase shall be carried out smoothly with a tension machine and the rate of
179 the load increase shall be between 5 000 N/min and 7 500 N/min for mechanical accessories and 1 000 N/min
180 to 5 000 N/min for connectors.
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181 4.2 Specific requirements for fittings used on covered conductor
182 4.2.1 General
183 The piercing part or element of any accessories shall not decrease the mechanical strength of the conductor
184 below than 90 % of the Minimum breaking load (MBL) of the conductor. All accessories are watertight, they
185 shall prevent moisture ingress in the conductor. The water tightness shall be tested according to 7.7.
186 The intended piercing of the cover is not considered as a damage caused by the fitting.
187 4.2.2 Tension clamps
188 For the purpose of terminating covered conductors over the covering fitting shall include, but are not limited to,
189 the following:
190 — cone, bolted or wedge type clamp;
191 — preformed helical fittings.
192 The fittings shall be able to withstand the specific minimum failure load (SMFL) and shall not damage the
193 covering and shall be designed to prevent the ingress of moisture during service.
194 “shall not damage the covering” means no damage shall occur which could affect the correct function of the
195 covering.
196 4.2.3 Suspension and top clamps
197 Fittings for the purpose of suspension over the covering include, but are not limited to the following:
198 — top-clamps;
199 — pre-formed helical fittings;
200 — suspension clamp according to EN 61284:1997, 11.4.
201 The fittings shall not damage the covering and shall be designed to prevent the ingress of moisture during
202 service.
203 “shall not damage the covering” means no damage shall occur which could affect the correct function of the
204 covering.
205 The suspension clamps shall be so designed that the effects of vibration, both on the covered conductor and
206 on the clamps themselves, are minimized. The clamps shall be designed to avoid localized pressure or damage
207 to the covered conductor.
208 If needed the suspension clamps shall have sufficient current carrying capability to avoid damage by fault
209 currents.
210 The wear resistance of the articulation assembly shall be sufficient to prevent deterioration in service.
211 4.2.4 Connectors for piercing the covering
212 Connectors shall be capable of carrying the load current, and fault current if any.
213 4.2.5 Arc protection devices
214 These protection devices are designed to protect insulator sets and covered conductors against damage caused
215 by power arcs (arcing horns, arcing rings).
216 The maximum short-circuit current shall be 10 kA for 1 s.
217 This device shall be delivered with an installation instruction. It shall include the description of the conditions for
218 installation of arc protection system in order this whole installation withstands the arc power test at 1 kA and
219 10 kA.
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220 The arc protective devices shall withstand a mechanical load in order to support the installation strengths.
221 4.2.6 Earth parking devices
222 The earth parking device shall be capable of carrying the short circuit current. The maximum short circuit current
223 shall be 10 kA for 1 s.
224 These fittings shall withstand a mechanical load in order to support the installation strengths.
225 4.2.7 Joint
226 The joint shall be suitable for the covered conductor for which they are designed.
227 The joint shall have the same basic insulation properties as the conductor covering. In this case, the test shall
228 by carried out according to EN 50397-1:2020, Table 2, ref. 1.2 “High voltage test”. The conductor shall have a
229 sufficient length so that the joint is immersed and the test duration shall be same as for sample test.
230 4.3 Marking
231 All products mentioned above shall permanently bear:
232 — manufacturer’s trade mark or logo;
233 — product code or reference;
234 — traceability code / batch number;
235 — the minimum and maximum cross section for which the unit is suitable;
236 — tightening torque or die reference, if applicable;
237 — recycling code, if any.
238 Other specific markings should be agreed between customer and manufacturer.
239 A test for marking is provided in 7.4.
240 5 Quality assurance
241 A quality assurance programme taking into account the requirements of this document can be used by
242 agreement between the purchaser and the supplier to verify the quality of the fittings during the manufacturing
243 process.
244 NOTE Detailed information on the use of quality assurance is given in EN ISO 9000, and other standards in the same
245 series.
246 6 Classification of tests – Type tests, sample tests, routine tests
247 6.1 Type tests
248 6.1.1 General
249 Type tests are intended to establish design characteristics. They are normally only made once and repeated
250 only when the design or the material of the fitting is changed. The results of type tests are recorded as evidence
251 of compliance with design requirements.
252 6.1.2 Application
253 Fittings shall be subject to type tests in accordance with Table A.1.
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254 6.2 Sample tests
255 6.2.1 General
256 Sample tests are intended to verify the quality of materials and workmanship.
257 6.2.2 Application
258 Overhead line fittings shall be subjected to sample tests as listed in Table A.1. The samples to be tested shall
259 be selected at random from the lot offered for acceptance. The purchaser has the right to make the selection.
260 6.2.3 Sampling and acceptance criteria
261 Unless otherwise agreed between purchaser and supplier, the sampling plan procedures according to
262 ISO 2859-1, ISO 2859-2 (inspection by attributes) and to the ISO 3951 series (inspection by variables) shall be
263 applied.
264 For each sample test, the type of inspection (by attributes or by variables) and the detailed procedures
265 (inspection level, acceptable quality level, single, double or multiple sampling, etc.) shall be agreed between
266 purchaser and supplier (see example in Annex B for inspection by attributes, and Annex C for inspection by
267 variables).
268 NOTE Sampling inspection by variables is an acceptance sampling procedure to be used in place of inspection by
269 attributes when it is more appropriate to measure on some continuous scale the characteristic(s) under consideration. In the
270 case of failure load tests and similar expensive tests, better discrimination between acceptable quality and objective quality
271 is available with acceptance sampling by variables than by attributes for the same sample size.
272 The purpose of the sampling process may also be important in the choice between a variables or attributes
273 plan.
274 For example, a purchaser may choose to use an attributes acceptance sampling plan to ensure that parts in a
275 shipment lot are within a required dimensional tolerance; the manufacturer may make measurements under a
276 variables sampling plan of the same dimensions because he is concerned with gradual trends or changes which
277 may affect his ability to provide shipment lots which meet the AQL.
278 6.3 Routine tests
279 6.3.1 General
280 Routine tests are intended to prove conformance of fittings to specific requirements and are made on every
281 fitting. The tests shall not damage the fitting.
282 6.3.2 Application and acceptance criteria
283 The compliance with the requirements according to Clause 4 shall be established by the tests listed in Table A.1.
284 The tests are only for fittings which are clamping the conductor over the covering.
285 7 Tests
286 7.1 General
287 Three samples of fittings or clamps shall be tested, except when the specific subclause requires another
288 number.
289 Annex A provides a table of the general tests required for each product.
290 NOTE This clause defines only the tests for fittings used over the covering.
291 For fittings directly used on conductor itself, see EN 61284.
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292 7.2 Visual examination
293 This test shall include visual examination to ascertain conformity of the fittings, in all essential respects, with the
294 contract drawings. Deviations from the drawings shall be subject to an agreement between supplier and
295 purchaser and shall be appropriately documented as an agreed concession.
296 7.3 Dimensional and material verification
297 These tests shall include verification of dimensions, to ensure that fittings are within the dimensional tolerances
298 stated on contract drawings. The purchaser may choose to witness the measurement of selected dimensions
299 or may inspect the supplier's documentation when this is available. Measuring devices/gauges shall be selected
300 with regard to the required precision and accuracy. Documentary evidence of calibration of such devices shall
301 be provided on request.
302 Routine tests shall include a specified level of dimensional checking when required by the contract quality plan.
303 Particular attention should be given to those dimensions potentially affecting fitting interchange ability (for
304 example ball and socket couplings (HD 474); clevis and tongue couplings (IEC 60471)) or mechanical and/or
305 electrical performance.
306 7.4 Test for permanent marking
307 7.4.1 Principle
308 This test shall be carried out according to the procedures of EN 50483-1:2009, 9.2.
309 This test ensures that the marking of accessories is readable and durable.
310 7.4.2 Test arrangement
311 Two samples shall be tested.
312 7.4.3 Procedure
313 The marking shall be rubbed by hand for 15 s with a piece of cloth soaked with water and again for 15 s with a
314 piece of cloth soaked with petroleum spirit.
315 NOTE Petroleum spirit is defined as the aliphatic solvent hexane with a content of aromatics of maximum 0,1 % by
3
316 volume, a kauri-butanol value of 29, initial boiling point of 65 °C, a dry point of 69 °C and a specific gravity of 0,68 g/cm .
317 7.4.4 Requirement
318 The marking shall remain clear and allow the accessory to be easily identified.
319 7.5 Mechanical tests
320 7.5.1 General
321 Number of fittings to be tested:
322 — type tests: mechanical type tests shall
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