prEN 50397-2

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

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 ustrezen pribor za naznačene izmenične napetosti nad 1 kV, ki ne presegajo 36 kV - 2. del: Pribor za oplaščene vodnike - Preskusi in prevzemni pogoji

General Information

• Status: Not Published
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/TC 20 - Electric cables
• Current Stage: 4099 - Decision to launch vote
• Due Date: 07-Jan-2022
• Completion Date: 07-Jan-2022
• Ref Project: oSIST prEN 50397-2:2021 - 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

RELATIONS

• Revised: EN 50397-2:2009 - Covered conductors for overhead lines and the related accessories for rated voltages above 1 kV AC and not exceeding 36 kV AC - Part 2: Accessories for covered conductors - Tests and acceptance criteria
• Effective Date: 22-Dec-2020

Standards Content (sample)

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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prEN 50397-2:2021 (E)
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

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
...