EN 50341-1-2012 en Overhead electrical lines exceeding AC 1 kV - Part 1 General requirements - Common specifications.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 50341-1:2012Overhead electrical linesexceeding AC 1 kV -Part 1: General requirements CommonspecificationsBS EN 50341-1:2012 BRITISH STANDARDNational forewordThis British St

2、andard is the UK implementation of EN 50341-1:2012.It supersedes BS EN 50341-1:2001+A1:2009 and BS EN 50423-1:2005which are withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PEL/11, Overhead Lines.A list of organizations represented on this committee can beobtaine

3、d on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013 ISBN 978 0 580 78410 1 ICS 29.240.20 Compliance with

4、a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2013. Amendments issued since publicationDate T e x t a f f e c t e dBS EN 50341-1:2012EUROPEAN STANDARD EN 50341-1 NORM

5、E EUROPENNE EUROPISCHE NORM December 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation

6、in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 50341-1:2012 E ICS 29.240.20 Supersedes EN 50341-1:2001 + A1:2009, EN 50423-1:2005 English version Overhead electrical lines exceeding AC 1 kV - Part 1: General requirements - Common specifications Lignes lectriques ari

7、ennes dpassant AC 1 kV - Partie 1: Rgles gnrales - Spcifications communes Freileitungen ber AC 1 kV - Teil 1: Allgemeine Anforderungen - Gemeinsame Festlegungen This European Standard was approved by CENELEC on 2012-11-19. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations

8、 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.

9、 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.

10、CENELEC members are the national electrotechnical 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 Neth

11、erlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 50341-1:2012EN 50341-1:2012 - 2 - Contents Foreword .17 0 Introduction.18 0.1 Detailed structure of the standard 18 0.2 Part 1: General requirements - Common specification

12、s .18 0.3 Part 2: National Normative Aspects 18 0.4 A-deviations .18 0.5 Special national conditions (snc) 18 0.6 National complements (NCPTs) 18 0.7 Language .18 1 Scope .19 1.1 General .19 1.2 Field of application .19 1.3 Structure of the European Standard EN 50341-1 .19 2 Normative references, de

13、finitions and symbols .20 2.1 Normative references .20 2.2 Definitions 26 2.3 Symbols .35 3 Basis of design .43 3.1 Introduction .43 3.2 Requirements of overhead lines .44 3.2.1 Basic requirements 44 3.2.2 Reliability requirements .45 3.2.3 Security requirements 46 3.2.4 Safety requirements .47 3.2.

14、5 Strength coordination .47 3.2.6 Additional considerations .47 3.2.7 Design working life .47 3.2.8 Durability 47 3.2.9 Quality assurance 47 3.3 Limit states 47 3.3.1 General 47 3.3.2 Ultimate limit states 47 3.3.3 Serviceability limit states48 3.4 Actions .48 3.4.1 Principal classifications 48 3.4.

15、2 Classification of actions by their variation in time 48 BS EN 50341-1:2012- 3 - EN 50341-1:2012 3.4.3 Classification of actions by their nature and/or the structural response 49 3.5 Characteristic values 49 3.5.1 Characteristic value of an action .49 3.5.1.1 Action (F) 49 3.5.1.2 Permanent action

16、(G) .49 3.5.1.3 Variable action (Q) 49 3.5.1.4 Accidental action (A) .49 3.5.2 Characteristic value of a material property 49 3.6 Design values 49 3.6.1 General 49 3.6.2 Design value of an action 49 3.6.3 Design value of a material property .50 3.6.4 Combination value of a variable action 50 3.7 Par

17、tial factor method and design formula 50 3.7.1 Partial factor method 50 3.7.2 Basic design formula .51 3.7.3 Total design value of the effect of combined actions 51 3.7.3.1 General .51 3.7.3.2 Design situations related to permanent and variable actions .51 3.7.3.3 Design situations related to perman

18、ent, variable and accidental actions.51 3.7.4 Structural design resistance 52 4 Actions on lines 53 4.1 Introduction .53 4.2 Permanent loads .55 4.3 Wind loads .55 4.3.1 Field of application and basic wind velocity .55 4.3.2 Mean wind velocity 55 4.3.3 Mean wind pressure 56 4.3.4 Turbulence intensit

19、y and peak wind pressure .57 4.3.5 Wind forces on any overhead line component 57 4.4 Wind forces on overhead line components .58 4.4.1 Wind forces on conductors 58 4.4.1.1 General .58 4.4.1.2 Structural factor.60 4.4.1.3 Drag factor 63 BS EN 50341-1:2012EN 50341-1:2012 - 4 - 4.4.2 Wind forces on ins

20、ulator sets 63 4.4.3 Wind forces on lattice towers .64 4.4.3.1 General .64 4.4.3.2 Method 1 .64 4.4.3.3 Method 2 .67 4.4.4 Wind forces on poles .68 4.5 Ice loads .69 4.5.1 General 69 4.5.2 Ice forces on conductors69 4.6 Combined wind and ice loads .70 4.6.1 Combined probabilities 70 4.6.2 Drag facto

21、rs and ice densities .71 4.6.3 Mean wind pressure and peak wind pressure .72 4.6.4 Equivalent diameter D of ice covered conductor .72 4.6.5 Wind forces on support for ice covered conductors 72 4.6.6 Combination of wind velocities and ice loads 73 4.6.6.1 Extreme ice load ITcombined with a high proba

22、bility wind velocity VIH73 4.6.6.2 Nominal ice load I3 combined with a low probability wind velocity VIL73 4.7 Temperature effects 74 4.8 Security loads 74 4.8.1 General 74 4.8.2 Torsional loads 74 4.8.3 Longitudinal loads 75 4.8.4 Mechanical conditions of application .75 4.9 Safety Loads 75 4.9.1 C

23、onstruction and maintenance loads 75 4.9.2 Loads related to the weight of linesmen 75 4.10 Forces due to short-circuit currents .76 4.11 Other special forces 76 4.11.1 Avalanches, creeping snow .76 4.11.2 Earthquakes .76 4.12 Load cases .76 4.12.1 General 76 4.12.2 Standard load cases 77 4.13 Partia

24、l factors for actions .80 BS EN 50341-1:2012- 5 - EN 50341-1:2012 5 Electrical requirements 81 5.1 Introduction .81 5.2 Currents .82 5.2.1 Normal current .82 5.2.2 Short-circuit current .82 5.3 Insulation co-ordination .83 5.4 Classification of voltages and overvoltages 83 5.4.1 General 83 5.4.2 Rep

25、resentative power frequency voltages 83 5.4.3 Representative temporary overvoltages 84 5.4.4 Representative slow-front overvoltages 84 5.4.5 Representative fast-front overvoltages 85 5.5 Minimum air clearance distances to avoid flashover 85 5.5.1 General 85 5.5.2 Application of the theoretical metho

26、d in Annex E 86 5.5.3 Empirical method based on European experience 89 5.6 Load cases for calculation of clearances .90 5.6.1 Load conditions 90 5.6.2 Maximum conductor temperature 90 5.6.3 Wind loads for determination of electric clearances 90 5.6.3.1 Wind load cases90 5.6.3.2 Nominal wind loads fo

27、r determination of internal and external clearances 91 5.6.3.3 Extreme wind loads for determination of internal clearances .91 5.6.4 Ice loads for determination of electric clearances .91 5.6.5 Combined wind and ice loads 91 5.7 Coordination of conductor positions and electrical stresses 91 5.8 Inte

28、rnal clearances within the span and at the top of support.92 5.9 External clearances 96 5.9.1 General 96 5.9.2 External clearances to ground in areas remote from buildings, roads, etc. 97 5.9.3 External clearances to residential and other buildings 98 5.9.4 External clearances to crossing traffic ro

29、utes 99 5.9.5 External clearances to adjacent traffic routes100 5.9.6 External clearances to other power lines or overhead telecommunication lines.101 5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) 102 5.10 Corona effect .103 BS EN 50341-1:2012EN 50341-1:2012 - 6 -

30、 5.10.1 Radio noise 103 5.10.1.1 General .103 5.10.1.2 Design influences .103 5.10.1.3 Noise limits 103 5.10.2 Audible noise .103 5.10.2.1 General .103 5.10.2.2 Design influences .104 5.10.2.3 Noise limit .104 5.10.3 Corona loss 104 5.11 Electric and magnetic fields 104 5.11.1 Electric and magnetic

31、fields under a line .104 5.11.2 Electric and magnetic field induction .105 5.11.3 Interference with telecommunication circuits .105 6 Earthing systems .106 6.1 Introduction .106 6.1.1 Purpose106 6.1.2 Requirements for dimensioning of earthing systems 106 6.1.3 Earthing measures against lightning eff

32、ects 107 6.1.4 Transferred potentials 107 6.2 Ratings with regard to corrosion and mechanical strength .107 6.2.1 Earth electrodes .107 6.2.2 Earthing and bonding conductors 107 6.3 Dimensioning with regard to thermal strength 107 6.3.1 General 107 6.3.2 Current rating calculation .108 6.4 Dimension

33、ing with regard to human safety .108 6.4.1 Permissible values for touch voltages .108 6.4.2 Touch voltage limits at different locations108 6.4.3 Basic design of earthing systems with regard to permissible touch voltage .110 6.4.4 Measures in systems with isolated neutral or resonant earthing 112 6.5

34、 Site inspection and documentation of earthing systems .112 7 Supports 113 7.1 Initial design considerations .113 7.1.1 Introduction 113 7.1.2 Structural design resistance of a pole .113 BS EN 50341-1:2012- 7 - EN 50341-1:2012 7.1.3 Buckling Resistance 113 7.2 Materials .113 7.2.1 Steel materials, b

35、olts, nuts and washers, welding consumables 113 7.2.2 Cold formed steel .113 7.2.3 Requirements for steel grades subject to galvanising .113 7.2.4 Holding-down bolts 113 7.2.5 Concrete and reinforcing steel .114 7.2.6 Wood114 7.2.7 Guy materials .114 7.2.8 Other materials 114 7.3 Lattice steel tower

36、s .114 7.3.1 General 114 7.3.2 Basis of design 114 7.3.3 Materials 114 7.3.4 Durability 114 7.3.5 Structural analysis .114 7.3.6 Ultimate limit states 115 7.3.6.1 General .115 7.3.6.2 Resistance of cross section areas 116 7.3.6.3 Tension, bending and compression resistance of members 116 7.3.6.4 Buc

37、kling resistance of members in compression .117 7.3.6.5 Buckling resistance of members in bending .117 7.3.7 Serviceability limit states117 7.3.8 Resistance of connections .117 7.3.9 Design assisted by testing .117 7.3.10 Fatigue .117 7.4 Steel poles .118 7.4.1 General 118 7.4.2 Basis of design (EN

38、1993-1-1:2005 Chapter 2) .118 7.4.3 Materials (EN 1993-1-1:2005 Chapter 3) .118 7.4.4 Durability (EN 1993-1-1:2005 Chapter 4) .118 7.4.5 Structural analysis (EN 1993-1-1:2005 Chapter 5) 118 7.4.6 Ultimate limit states (EN 1993-1-1:2005 Chapter 6) .118 7.4.6.1 General .118 BS EN 50341-1:2012EN 50341-

39、1:2012 - 8 - 7.4.6.2 Resistance of cross section areas 119 7.4.7 Serviceability limit states (EN 1993-1-1:2005 Chapter 7) .119 7.4.8 Resistance of connections .119 7.4.8.1 Basis .119 7.4.8.2 Bolts (other than holding-down bolts) .119 7.4.8.3 Slip joint connections 119 7.4.8.4 Flanged bolted connecti

40、ons 120 7.4.8.5 Welded connections .120 7.4.8.6 Direct embedding into the concrete 120 7.4.8.7 Base plate and holding-down bolts .120 7.4.9 Design assisted by testing .121 7.5 Wood poles 121 7.5.1 General 121 7.5.2 Basis of design 121 7.5.3 Materials 121 7.5.4 Durability 121 7.5.5 Ultimate limit sta

41、tes 121 7.5.5.1 Basis .121 7.5.5.2 Calculation of internal forces and moments .121 7.5.5.3 Resistance of wood elements .122 7.5.5.4 Decay conditions 122 7.5.6 Serviceability limit states123 7.5.7 Resistance of connections .123 7.5.8 Design assisted by testing .123 7.6 Concrete poles 123 7.6.1 Genera

42、l 123 7.6.2 Basis of design 123 7.6.2.1 General rules 123 7.6.2.2 Design load .123 7.6.2.3 Lateral reinforcement 124 7.6.3 Materials 124 7.6.4 Ultimate limit states 124 7.6.5 Serviceability limit states124 7.6.6 Design assisted by testing .124 BS EN 50341-1:2012- 9 - EN 50341-1:2012 7.7 Guyed struct

43、ures 125 7.7.1 General 125 7.7.2 Basis of design 125 7.7.3 Materials 125 7.7.4 Ultimate limit states 125 7.7.4.1 Basis .125 7.7.4.2 Calculation of internal forces and moments .126 7.7.4.3 Second order analysis 126 7.7.4.4 Maximum slendernesses 127 7.7.5 Serviceability limit states127 7.7.6 Design de

44、tails for guys 127 7.8 Other structures 128 7.9 Corrosion protection and finishes 128 7.9.1 General 128 7.9.2 Galvanising 128 7.9.3 Metal spraying .129 7.9.4 Paint over galvanising in plant (Duplex system) 129 7.9.5 Decorative finishes 129 7.9.6 Use of weather-resistant steels .129 7.9.7 Protection

45、of wood poles .129 7.10 Maintenance facilities .130 7.10.1 Climbing .130 7.10.2 Maintainability 130 7.10.3 Safety requirements .130 7.11 Loading tests .130 7.12 Assembly and erection .130 8 Foundations 131 8.1 Introduction .131 8.2 Basis of geotechnical design (EN 1997-1:2004 Section 2) 131 8.2.1 Ge

46、neral 131 8.2.2 Geotechnical design by calculation .131 8.2.3 Design by prescriptive measures 133 8.2.4 Load tests and tests on experimental models .133 8.3 Soil investigation and geotechnical data (EN 1997-1:2004 Section 3) .133 8.4 Supervision of construction, monitoring and maintenance (EN 1997-1

47、:2004 Section 4) 133 BS EN 50341-1:2012EN 50341-1:2012 - 10 - 8.5 Fill, dewatering, ground improvement and reinforcement (EN 1997-1:2004 Section 5) 133 8.6 Interactions between support foundations and soil .133 9 Conductors and earth-wires135 9.1 Introduction .135 9.2 Aluminium based conductors .135

48、 9.2.1 Characteristics and dimensions .135 9.2.2 Electrical requirements 135 9.2.3 Conductor service temperatures and grease characteristics 136 9.2.4 Mechanical requirements.136 9.2.5 Corrosion protection 136 9.2.6 Test requirements 136 9.3 Steel based conductors137 9.3.1 Characteristics and dimens

49、ions .137 9.3.2 Electrical requirements 137 9.3.3 Conductor service temperatures and grease characteristics 137 9.3.4 Mechanical requirements.137 9.3.5 Corrosion protection 137 9.3.6 Test requirements 137 9.4 Copper based conductors137 9.5 Conductors and ground wires containing optical fibre telecommunication circuits 138 9.5.1 Characteristics and dimensions .138 9.5.2 Electrical requirements 138 9.5.3 Conductor service temperatures .138 9.5.4 Mechanical requirements.138 9.5.5 Corrosion protection 138 9.5.6 Test requirements 138 9.6 General requirements