EN 50341-2-9-2017 en Overhead electrical lines exceeding AC 1 kV - Part 2-9 National Normative Aspects (NNA) for Great Britain and Northern Ireland.pdf

1、Overhead electrical lines exceeding AC 1 kVPart 2-9: National Normative Aspects (NNA) for Great Britain and Northern Ireland (based on EN 50341-1:2012)BS EN 50341-2-9:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06National forewordThis British Standard is the UK

2、 implementation of EN 50341-2-9:2017.This Standard, together with the following list of National Normative Aspect Standards, supersedes BS EN 50423-3:2005 and BS EN 50341-3:2001. It also supersedes BS EN 50341-2-9:2015, which is withdrawn.Country CodeOrigin RefAT Austrian National Committee BS EN 50

3、341-2-1BE Belgian National Committee BS EN 50341-2-2CH Swiss National Committee BS EN 50341-2-3DE German National Committee BS EN 50341-2-4:2016DK Danish National Committee BS EN 50341-2-5:2017ES Spanish National Committee BS EN 50341-2-6:2017FI Finnish National Committee BS EN 50341-2-7:2015FR Fren

4、ch National Committee BS EN 50341-2-8GB British National Committee BS EN 50341-2-9:2017GR Greek National Committee BS EN 50341-2-10IE Irish National Committee BS EN 50341-2-11IS Iceland National Committee BS EN 50341-2-12IT Italian National Committee BS EN 50341-2-13:2017LU Luxemburg National Commit

5、tee No NNA availableNL Nederlands National Committee BS EN 50341-2-15NO Norwegian National Committee BS EN 50341-2-16:2016PT Portuguese National Committee BS EN 50341-2-17SE Swedish National Committee BS EN 50341-2-18:2016CZ Czech National Committee BS EN 50341-2-19:2015EE Estonian National Committe

6、e BS EN 50341-2-20:2015PL Polish National Committee BS EN 50341-2-22:2016SK Slovak National Committee BS EN 50341-2-23:2016BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon publication of the rest of the series.The UK participation in its preparation was entrusted to Technical Committ

7、ee PEL/11, Overhead lines.A list of organizations represented on this committee can be obtained on request to its secretary.BRITISH STANDARDBS EN 50341-2-9:2017This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

8、The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 98774 8ICS 29.240.20Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on

9、 31 October 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARD BS EN 50341-2-9:2017EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50341-2-9 May 2017 ICS 29.240.20 Supersedes EN 50341-2-9:2015 English Version Overhead electrical lines exceeding AC 1 kV - Part

10、2-9: National Normative Aspects (NNA) for Great Britain and Northern Ireland (based on EN 50341-1:2012) This European Standard was approved by CENELEC on 2017-04-26. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denma

11、rk, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Eur

12、opean Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwi

13、de for CENELEC Members. Ref. No. EN 50341-2-9:2017 E EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50341-2-9 May 2017 ICS 29.240.20 Supersedes EN 50341-2-9:2015 English Version Overhead electrical lines exceeding AC 1 kV - Part 2-9: National Normative Aspects (NNA) for Great Britain and North

14、ern Ireland (based on EN 50341-1:2012) This European Standard was approved by CENELEC on 2017-04-26. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Fran

15、ce, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europe

16、n de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50341-2-9:2017 E BS EN 50341-

17、2-9:2017EN 50341-2-9:2017 -2/35- Great Britain and Northern Ireland CONTENTS 1 Scope 6 1.1 General 6 2 Normative References, definitions and symbols . 6 2.1 Normative references . 6 2.3 Symbols . 7 3 Basis of design 7 3.2 Requirements of overhead lines . 7 3.2.2 Reliability requirements 7 3.2.5 Stre

18、ngth coordination . 7 3.2.6 Additional considerations 7 3.3 Limit states . 7 3.3.3 Serviceability limit states 7 4 Actions on lines 8 4.1 Introduction . 8 4.3 Wind loads . 8 4.3.1 Field of application and basic wind velocity 8 4.3.2 Mean wind velocity . 9 4.3.3 Mean wind pressure . 9 4.4 Wind forces

19、 on overhead line components . 9 4.4.1 Wind forces on conductors . 10 4.4.3 Wind forces on lattice towers . 11 4.5 Ice loads 11 4.6 Combined Wind and Ice loads 12 4.7 Temperature effects . 13 4.8 Security loads . 13 4.9 Safety loads . 14 4.9.1 Construction and maintenance loads . 14 4.9.2 Loads rela

20、ted to the weight of linesmen . 14 4.10 Forces due to short-circuit currents . 14 4.11 Other special forces . 14 4.12 Load cases 15 4.12.2 Standard load cases . 15 4.13 Partial factors for actions 16 5 Electrical requirements 19 5.2 Currents . 19 BS EN 50341-2-9:2017EN 50341-2-9:2017 -2/35- Great Br

21、itain and Northern Ireland CONTENTS 1 Scope 6 1.1 General 6 2 Normative References, definitions and symbols . 6 2.1 Normative references . 6 2.3 Symbols . 7 3 Basis of design 7 3.2 Requirements of overhead lines . 7 3.2.2 Reliability requirements 7 3.2.5 Strength coordination . 7 3.2.6 Additional co

22、nsiderations 7 3.3 Limit states . 7 3.3.3 Serviceability limit states 7 4 Actions on lines 8 4.1 Introduction . 8 4.3 Wind loads . 8 4.3.1 Field of application and basic wind velocity 8 4.3.2 Mean wind velocity . 9 4.3.3 Mean wind pressure . 9 4.4 Wind forces on overhead line components . 9 4.4.1 Wi

23、nd forces on conductors . 10 4.4.3 Wind forces on lattice towers . 11 4.5 Ice loads 11 4.6 Combined Wind and Ice loads 12 4.7 Temperature effects . 13 4.8 Security loads . 13 4.9 Safety loads . 14 4.9.1 Construction and maintenance loads . 14 4.9.2 Loads related to the weight of linesmen . 14 4.10 F

24、orces due to short-circuit currents . 14 4.11 Other special forces . 14 4.12 Load cases 15 4.12.2 Standard load cases . 15 4.13 Partial factors for actions 16 5 Electrical requirements 19 5.2 Currents . 19 Great Britain and Northern Ireland -3/35- EN 50341-2-9:2017 5.2.1 Normal current 19 5.2.2 Shor

25、t circuit current 19 5.5 Minimum air clearance distances to avoid flashover . 20 5.5.3 Empirical method based on European experience. 20 5.6 Load cases for calculation of clearances. 20 5.6.1 Load cases for calculation of clearances . 20 5.6.3 Wind load for determination of electric clearances 20 5.

26、6.4 Ice load for determination of electric clearances 20 5.6.5 Combined wind and ice loads. 20 5.8 Internal clearances within the span and at the top of support 20 5.9 External clearances 21 5.9.1 General . 21 5.9.4 External clearances to crossing traffic routes 21 5.9.6 External clearances to other

27、 power lines or overhead telecommunication lines 22 5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 22 5.10 Corona effect . 22 5.10.2 Audible noise 22 5.10.3 Corona loss 22 5.11 Electrical and magnetic field . 22 5.11.1 Electrical and magnetic fields under a line

28、. 22 6 Earthing Systems 22 6.2 Ratings with regard to corrosion and mechanical strength 22 6.2.1 Earth electrodes 22 6.4 Dimensioning with regard to human safety . 22 7 Supports 23 7.3 Lattice steel towers 23 7.3.6 Ultimate limit states 23 7.4 Steel poles . 23 7.4.5 Structural analysis 23 7.4.6 Ulti

29、mate limit states 23 7.5 Wood Poles . 24 7.5.1 General . 24 7.5.5 Ultimate limit states 24 7.7 Guyed structures 25 8. Foundations. 25 8.2 Basis of geotechnical design 25 8.2.2 Geotechnical design . 25 8.2.3 Design by prescriptive measures . 25 8.2.4 Load tests and tests on experimental models 25 8.4

30、 Supervision of construction, monitoring and maintenance 25 9. Conductor and earth wires 26 BS EN 50341-2-9:2017EN 50341-2-9:2017 -4/35- Great Britain and Northern Ireland 10. Insulators . 26 10.10 Characteristics and dimensions of insulators 26 11 Line equipment overhead line fittings . 27 11.9 Cha

31、racteristics and dimensions of insulator fittings 27 12 Quality assurance, checks and taking-over . 27 Annex J Angles in lattice steel towers . 27 J.4 Buckling resistance of angles in compression (see 7.3.6.4) . 27 J.4.2 Effective non-dimensional slenderness for flexural buckling 27 J.4.3 Slendernes

32、s of members . 27 J.4.3.3 Primary bracing patterns 27 J.5 Design resistance of bolted connections (see 7.3.8) . 28 J.5.1 General . 28 Figure NA.1 10-Minute mean wind speeds for GB, vb, mapin metres per second 29 Figure NA.2 Ice thickness for GB, roand (rw) in millimetres . 30 Figure NA.3 Weather Zon

33、es for site heights of 0 to 100m 31 Figure NA.4 Weather Zones for site heights of 100 to 200m 32 Figure NA.5 Weather Zones for site heights of 200 to 300m 33 Figure NA.6 Weather Zones for site heights of 300 to 400m 34 Figure NA.7 Weather Zones for site heights of 400 to 500m 35 BS EN 50341-2-9:2017

34、EN 50341-2-9:2017 -4/35- Great Britain and Northern Ireland 10. Insulators . 26 10.10 Characteristics and dimensions of insulators 26 11 Line equipment overhead line fittings . 27 11.9 Characteristics and dimensions of insulator fittings 27 12 Quality assurance, checks and taking-over . 27 Annex J A

35、ngles in lattice steel towers . 27 J.4 Buckling resistance of angles in compression (see 7.3.6.4) . 27 J.4.2 Effective non-dimensional slenderness for flexural buckling 27 J.4.3 Slenderness of members . 27 J.4.3.3 Primary bracing patterns 27 J.5 Design resistance of bolted connections (see 7.3.8) .

36、28 J.5.1 General . 28 Figure NA.1 10-Minute mean wind speeds for GB, vb, mapin metres per second 29 Figure NA.2 Ice thickness for GB, roand (rw) in millimetres . 30 Figure NA.3 Weather Zones for site heights of 0 to 100m 31 Figure NA.4 Weather Zones for site heights of 100 to 200m 32 Figure NA.5 Wea

37、ther Zones for site heights of 200 to 300m 33 Figure NA.6 Weather Zones for site heights of 300 to 400m 34 Figure NA.7 Weather Zones for site heights of 400 to 500m 35 Great Britain and Northern Ireland -5/35- EN 50341-2-9:2017 European foreword 1. The British National Committee is identified by the

38、 following address: British Standards Institution 389 Chiswick High Road London W4 4AL Tel: + 44 20 8996 9000 Fax: + 44 20 8996 7799 email: infobsi.org.uk Attention: Secretary of PEL/11 Overhead lines Standards Development 2. The British National Committee has prepared this NNA (part 2-9 of EN 50341

39、) listing the GB National Normative Aspects under its sole responsibility and duly passed this document through the CENELEC and CLC/TC 11 procedures. NOTE: The British National NC also takes sole responsibility for the technically correct co-ordination of this NNA with EN 50341-1. It has performed t

40、he necessary checks in the frame of quality assurance / control. However, it is noted that this quality control has been made in the framework of the general responsibility of a standards committee under the national laws / regulations. 3. This Part 2-9 is normative in GB and informative for other c

41、ountries. 4. This document shall be read in conjunction with Part 1 (EN 50341-1). All clause numbers used in this NNA correspond to those in Part 1. Specific sub-clauses that are prefixed “GB” are to be read as amendments to the relevant text in Part 1. Any necessary clarification regarding the appl

42、ication of this NNA in conjunction with Part 1 shall be referred to the British NC who will, in co-operation with CLC/TC 11, clarify the requirements. Where no reference is made in this NNA to a specific sub-clause, then Part 1 shall apply. 5. In the case of “boxed values” defined in Part 1, amended

43、 values (if any), which are defined in this NNA, shall be taken into account in GB and Northern Ireland. However any boxed value whether in Part 1 or in this NNA, shall not be amended in the direction of greater risk in a Project Specification. 6. The GB and Northern Ireland standards/ regulations r

44、elating to overhead electrical lines exceeding A.C. 1 kV are listed in subclause 2.1. 7. The British NC declares in accordance with clause 4.1 of Part 1 that this NNA follows both design “Approach 1” and design “Approach 3”. The specific design Approach to be used shall be specified in the Project S

45、pecification. BS EN 50341-2-9:2017EN 50341-2-9:2017 -6/35- Great Britain and Northern Ireland 1 SCOPE 1.1 General (ncpt) GB.1 General This NNA is only applicable to all new overhead lines above A.C. 1kV. This Euronorm is only applicable to new overhead lines and shall not be applied to maintenance,

46、reconductoring, tee-offs, extensions or diversions to existing overhead lines unless specifically required by the Project Specification. For details of the application of this standard for overhead lines constructed with covered conductor refer to the Project Specification. For details of the applic

47、ation of this standard to telecommunication systems involving optical fibres either incorporated in or wrapped around earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specification. 2 NORMATIVE REFERENCES, DEFINITIONS AND SYMBOLS 2.1 Normativ

48、e references (A-dev) GB.1 National statutes Reference Name and Date of GB and NI Statute Electricity Act 1989, Chapter 29, Health and Safety at Work Act 1974 and subsequent amendments SI 635 The Electricity at Work Regulations 1989 (Northern Ireland) 1991 SI 1355 The Electricity (Overhead Lines) Reg

49、ulations 1970 SI 2035 The Overhead Lines (Exemption) Regulations 1990 SI 2665 The Electricity Safety, Quality and Continuity Regulations 2002 SI 381 The Electricity Safety, Quality and Continuity Regulations (Northern Ireland) 2012 SI 3074 The Overhead Lines (Exemption) Regulations 1992 SI 320 The Construction (Design & Management) Regulations 2007 SI 231(NI) Electricity (Northern Ireland) Order 1992 SR 142 The Construction (Design & Management) (Amendment) Regulations (Northern Ireland) 2001 SR 209 The Construction (Design & Management) Regulations (Norther