EN 50341-2-9-2015 en Overhead electrical lines exceeding AC 1 kV - Part 2-9 National Normative Aspects (NNA) for Great Britain and Northern Ireland.pdf

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1、BSI Standards PublicationBS EN 50341-2-9:2015Overhead electrical linesexceeding AC 1 kVPart 2-9: National Normative Aspects (NNA)for Great Britain and Northern Ireland(based on EN 50341-1:2012)BS EN 50341-2-9:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN

2、50341-2-9:2015.This standard, together with the following list of NationalNormative Aspect standards, supersedes BS EN 50423-3:2005 andBS EN 50341-3:2001:CountryCode Origin Ref AT Austrian National Committee BS EN 50341-2-1 BE Belgian National Committee BS EN 50341-2-2 CH Swiss National Committee BS

3、 EN 50341-2-3 DE German National Committee BS EN 50341-2-4 DK Danish National Committee BS EN 50341-2-5 ES Spanish National Committee BS EN 50341-2-6 FI Finnish National Committee BS EN 50341-2-7 FR French National Committee BS EN 50341-2-8 GB British National Committee BS EN 50341-2-9:2015 GR Greek

4、 National Committee BS EN 50341-2-10 IE Irish National Committee BS EN 50341-2-11 IS Iceland National Committee BS EN 50341-2-12 IT Italian National Committee BS EN 50341-2-13 LU Luxemburg National Committee No NNA availableNL Nederlands National Committee BS EN 50341-2-15NO Norwegian National Commi

5、ttee BS EN 50341-2-16PT Portuguese National Committee BS EN 50341-2-17SE Swedish National Committee BS EN 50341-2-18 CZ Czech National Committee BS EN 50341-2-19:2015EE Estonian National Committee BS EN 50341-2-20:2015 SI Slovak National Committee BS EN 50341-2-21 PL Polish National Committee BS EN

6、50341-2-22 BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn uponpublication of the rest of the series.The UK participation in its preparation was entrusted to TechnicalCommittee PEL/11, Overhead Lines.A list of organizations represented on this committee can be obtainedon request to its s

7、ecretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 91204 7ICS 29.240.20Compliance with a British Standard cann

8、ot confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 31 July 2015.Amendments/corrigenda issued since publicationDate Text affectedBS EN 50341-2-9:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 5034

9、1-2-9 June 2015 ICS 29.240.20 English Version Overhead electrical lines exceeding AC 1 kV - Part 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 2015-06-02. CENELEC members are the national elec

10、trotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Ro

11、mania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Bruss

12、els 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50341-2-9:2015 E BS EN 50341-2-9:2015EN 50341-2-9:2015 -2/34- Great Britain and Northern Ireland CONTENTS 1 Scope 6 1.1 General 6 2 Normative References, definitions and symbo

13、ls . 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 considerations 7 3.3 Limit states . 7 3.3.3 Serviceability limit states 7 4 Actions on lines 8 4.1 Introduc

14、tion . 8 4.3 Wind loads . 8 4.3.1 Field of application and basic wind velocity 8 4.3.2 Mean wind velocity . 8 4.3.3 Mean wind pressure . 9 4.4 Wind forces on overhead line components . 9 4.4.1 Wind forces on conductors . 10 4.4.3 Wind forces on lattice towers . 10 4.5 Ice loads 11 4.6 Combined Wind

15、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 Forces due to short-circuit currents . 14 4.11 Other special forces . 14 4.12 Load cases 14 4.12.2 Standar

16、d load cases . 14 4.13 Partial factors for actions 15 5 Electrical requirements 18 5.2 Currents . 18 5.2.1 Normal current 18 5.2.2 Short circuit current 18 BS EN 50341-2-9:2015EN 50341-2-9:2015 -2/34-BS EN 50341-2-9:2015Great Britain and Northern Ireland -3/34- EN 50341-2-9:2015 5.5 Minimum air clea

17、rance distances to avoid flashover . 19 5.5.3 Empirical method based on European experience. 19 5.6 Load cases for calculation of clearances. 19 5.6.1 Load cases for calculation of clearances . 19 5.6.3 Wind load for determination of electric clearances 19 5.6.4 Ice load for determination of electri

18、c clearances 19 5.6.5 Combined wind and ice loads. 19 5.8 Internal clearances within the span and at the top of support 19 5.9 External clearances 20 5.9.1 General . 20 5.9.4 External clearances to crossing traffic routes 20 5.9.6 External clearances to other power lines or overhead telecommunicatio

19、n lines 21 5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 21 5.10 Corona effect . 21 5.10.2 Audible noise 21 5.10.3 Corona loss 21 5.11 Electrical and magnetic field . 21 5.11.1 Electrical and magnetic fields under a line . 21 6 Earthing Systems 21 6.2 Ratings wi

20、th regard to corrosion and mechanical strength 21 6.2.1 Earth electrodes 21 6.4 Dimensioning with regard to human safety . 21 7 Supports 22 7.3 Lattice steel towers 22 7.3.6 Ultimate limit states 22 7.4 Steel poles . 22 7.4.5 Structural analysis 22 7.4.6 Ultimate limit states 22 7.5 Wood Poles . 23

21、7.5.1 General . 23 7.5.5 Ultimate limit states 23 7.7 Guyed structures 24 8. Foundations. 24 8.2 Basis of geotechnical design 24 8.2.2 Geotechnical design . 24 8.2.3 Design by prescriptive measures . 24 8.2.4 Load tests and tests on experimental models 24 8.4 Supervision of construction, monitoring

22、and maintenance 24 9. Conductor and earth wires 24 10. Insulators . 25 10.10 Characteristics and dimensions of insulators 25 BS EN 50341-2-9:2015EN 50341-2-9:2015-3/34BS EN 50341-2-9:2015EN 50341-2-9:2015 -4/34- Great Britain and Northern Ireland 11 Line equipment overhead line fittings . 26 11.9 Ch

23、aracteristics and dimensions of insulator fittings 26 12 Quality assurance, checks and taking-over . 26 Annex J Angles in lattice steel towers . 26 J.4 Buckling resistance of angles in compression (see 7.3.6.4) . 26 J.4.2 Effective non-dimensional slenderness for flexural buckling 26 J.4.3 Slenderne

24、ss of members . 26 J.4.3.3 Primary bracing patterns 26 J.5 Design resistance of bolted connections (see 7.3.8) . 27 J.5.1 General . 27 Figure NA.1 10-Minute mean wind speeds for GB, vb, mapin metres per second 28 Figure NA.2 Ice thickness for GB, roand (rw) in millimetres . 29 Figure NA.3 Weather Zo

25、nes for site heights of 0 to 100m 30 Figure NA.4 Weather Zones for site heights of 100 to 200m 31 Figure NA.5 Weather Zones for site heights of 200 to 300m 32 Figure NA.6 Weather Zones for site heights of 300 to 400m 33 Figure NA.7 Weather Zones for site heights of 400 to 500m 34 BS EN 50341-2-9:201

26、5EN 50341-2-9:2015 -4/34-BS EN 50341-2-9:2015Great Britain and Northern Ireland -5/34- EN 50341-2-9:2015 Foreword 1. The British National Committee is identified by the following address: British Standards Institution 389 Chiswick High Road London W4 4AL Tel: + 44 20 8996 9000 Fax: + 44 20 8996 7799

27、 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) listing the GB National Normative Aspects under its sole responsibility and duly passed this document through the CENELEC and CLC/

28、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 the necessary checks in the frame of quality assurance / control. However, it is noted that this quality control has been made in the

29、 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 countries. 4. This document shall be read in conjunction with Part 1 (EN 50341-1). All clause numbers used in this NNA correspond to

30、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 application 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

31、 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 values (if any), which are defined in this NNA, shall be taken into account in GB and Northern Ireland. However any boxed value whe

32、ther 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 relating to overhead electrical lines exceeding A.C. 1 kV are listed in subclause 2.1. 7. The British NC declares in accordance with

33、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 Specification. BS EN 50341-2-9:2015EN 50341-2-9:2015-5/34BS EN 50341-2-9:2015EN 50341-2-9:2015 -6/34- Great Britain and Northern Irel

34、and 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, reconductoring, tee-offs, extensions or diversions to existing overhead lines unless speci

35、fically 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 application of this standard to telecommunication systems involving optical fibres either incorp

36、orated 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 Normative references (A-dev) GB.1 National statutes Reference Name and Date of GB and NI Statute E

37、lectricity 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) Regulations 1970 SI 2035 The Overhead Lines (Exemption) Regulations 1990 SI 2665 The Electric

38、ity 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 21,20 (e1/d0); 31,85 (e1/d0 0,5); 40,96 (P1/d0 0,5); 52,3 (e2/d0 0,5)

39、and iare reduction factors The default value for each iis 1, but a smaller (more conservative) value may be defined in the NNA. The value of is still valid in the case of bolts layout on two or more rows if P1, e1and e2are defined as: P1is the minimum centre-to-centre distance between two consecutiv

40、e holes, on the same row; e1is the minimum distance of the bolt nearest to the end; e2is the minimum distance of the bolt nearest to the edge. The design resistance of a group of fasteners may be taken as the sum of the design bearing resistances, Fb,Rd of the individual fasteners provided that the

41、design shear resistance, Fv,Rdof each individual fastener is greater than or equal to the design bearing resistance, Fb,Rd. Otherwise, the design resistance of a group of fasteners should be taken as the number of fasteners multiplied by the smallest design resistance of any of the individual fasten

42、ers. Tension resistance per bolt: Ft,Rd = 0,9 fubAS/ M2fuis the ultimate tensile strength fubis the ultimate tensile strength for bolt fybis the yield strength for bolt A is the gross cross-section area of bolt ASis the tensile stress area of bolt d is the bolt diameter t, d0, e1, e2, P1are as defined in Figure J.6 M2is as defined in 7.3.6.1 BS EN 50341-2-9:2015EN 50341-2-9:2015-27/34BS EN 50341-2-9:2015EN 50341-2-9:2015 -28/34- Great Britain and Northern Ireland Figure NA.1 10-Minute mean wind speeds for GB, vb, mapin metres per second BS EN 50341-2-9:2015EN 50341-2-9:2015 -28/34-