SIST EN 50341-2-4:2016

SLOVENSKI STANDARD
SIST EN 50341-2-4:2016
01-september-2016
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Overhead electrical lines exceeding AC 1 kV - Part 2-4: National Normative Aspects
(NNA) for Germany (based on EN 50341-1:2012)
Freileitungen über AC 1 kV - Teil 2-4: Nationale Normative Festlegungen (NNA) für
Deutschland (basierend auf EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-4:2016
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
SIST EN 50341-2-4:2016 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50341-2-4:2016

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SIST EN 50341-2-4:2016


EUROPEAN STANDARD EN 50341-2-4

NORME EUROPÉENNE

EUROPÄISCHE NORM
January 2016
ICS 29.240.20

English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-4: National
Normative Aspects (NNA) for Germany (based on EN 50341-
1:2012)

This European Standard was approved by CENELEC on 2015-12-01. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 50341-2-4:2016 E

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SIST EN 50341-2-4:2016
EN 50341-2-4:2016 – 2/90 – Germany

Contents


Page
European foreword . 8
1 Scope . 9
1.1 General . 9
1.2 Field of application . 9
2 Normative references, definitions and symbols . 9
2.1 Normative references . 9
2.2 Definitions . 14
2.3 Symbols . 19
3 Basis of design . 23
3.2 Requirements of overhead lines . 23
3.2.1 Basic requirements . 23
3.2.2 Reliability requirements . 23
3.2.5 Strength coordination . 23
3.2.6 Additional considerations . 23
3.4 Actions . 23
3.4.3 Classification of actions by their nature and/or the structural response . 23
3.6 Design values . 24
3.6.3 Design value of a material property . 24
3.6.4 Combination value of a variable action . 24
4 Actions on lines . 24
4.1 Introduction . 24
4.3 Wind loads . 24
4.4 Wind forces on overhead line components . 27
4.4.1 Wind forces on conductors . 27
4.4.2 Wind forces on insulator sets . 29
4.4.3 Wind forces on lattice towers . 30
4.4.4 Wind forces on poles . 32
4.5 Ice loads . 32
4.5.2 Ice forces on conductors . 32
4.6 Combined wind and ice loads . 34
4.6.4 Equivalent diameter D of ice-covered conductor . 34
4.6.6 Combination of wind velocities and ice loads . 34
4.8 Security loads . 34
4.8.1 General. 34
4.9 Safety loads . 34
4.9.1 Construction and maintenance loads . 34

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Page
4.9.2 Loads related to the weight of lines men. 35
4.10 Forces due to short-circuit currents . 35
4.11 Other special forces . 35
4.12 Load cases . 35
4.12.1 General . 35
4.12.2 Standard load cases. 36
4.13 Partial factors for actions . 39
5 Electrical requirements . 40
5.2 Currents . 40
5.2.1 Normal current . 40
5.4 Classification of voltages and overvoltages . 40
5.4.2 Representative power frequency voltages . 40
5.5 Minimum air clearance distances to avoid flashover. 40
5.5.3 Empirical method based on European experience . 40
5.6 Load cases for calculation of clearances . 40
5.6.3 Wind loads for determination of electric clearances . 40
5.6.4 Ice loads for the determination of electric clearances . 41
5.6.5 Combined wind and ice loads . 41
5.8 Internal clearances within the span and at the top of support . 41
5.9 External clearances . 42
5.9.1 General . 42
5.9.2 External clearances to ground in areas remote from buildings, roads etc. . 45
5.9.3 External clearances to residential and other buildings . 45
5.9.4 External clearances to crossing traffic routes . 47
5.9.5 External clearances to adjacent traffic routes . 47
5.9.6 External clearances to other power lines or overhead telecommunication lines . 48
5.11 Electric and magnetic fields . 48
5.11.1 Electric and magnetic fields under a line. 48
5.11.2 Electric and magnetic field Induction . 48
5.11.3 Interference with telecommunication circuits . 49
6 Earthing systems . 49
6.1 Introduction . 49
6.1.2 Requirements for dimensioning of earthing systems . 49
6.1.3 Earthing measures against lightning effects . 51
6.3 Dimensioning with regard to thermal strength . 51
6.3.2 Current rating calculation . 51
6.4 Dimensioning with regard to human safety . 52
6.4.2 Touch voltage limits at different locations . 52

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Page
6.4.3 Basic design of earthing systems with regard to permissible touch voltage . 52
6.4.4 Measures in systems with isolated neutral or resonant earthing . 53
6.5 Site inspection and documentation of earthing systems . 53
7 Supports . 53
7.1 Initial design considerations . 53
7.2 Materials . 54
7.2.1 Steel materials, bolts, nuts and washers, welding consumables . 54
7.2.6 Wood . 54
7.2.8 Other materials . 54
7.3 Lattice steel towers. 54
7.3.1 General. 54
7.3.5 Structural analysis . 55
7.3.6 Ultimate limit states . 55
7.3.8 Resistance of connections . 55
7.4 Steel poles . 57
7.4.1 General. 57
7.4.5 Structural analysis . 57
7.4.6 Ultimate limit states . 57
7.4.7 Serviceability limit states . 58
7.4.8 Resistance of connections . 58
7.5 Wood poles . 58
7.5.2 Basis of design . 58
7.5.5 Ultimate limit states . 59
7.5.6 Serviceability limit states . 59
7.5.7 Resistance of connections . 59
7.6 Concrete poles . 59
7.6.2 Basis of Design . 59
7.6.2.1 General rules . 59
7.6.4 Ultimate limit states . 59
7.6.5 Serviceability limit states . 60
7.7 Guyed structures . 60
7.7.1 General. 60
7.7.3 Materials . 60
7.8 Other structures . 60
7.9 Corrosion protections and finishes . 61
7.9.1 General. 61
7.9.2 Galvanising . 61
7.9.4 Paint over galvanising in plant (Duplex system) . 61
7.9.7 Protection of wood poles . 61
7.10 Maintenance facilities . 61

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Page
7.10.1 Climbing . 61
7.10.2 Maintainability . 63
7.10.3 Safety requirements . 63
8 Foundations . 63
8.2 Basis of geotechnical design . 63
8.2.2 Geotechnical design by calculation . 63
8.2.3 Design by prescriptive measures . 64
8.2.4 Load tests and tests on experimental models . 64
8.6 Interaction between support foundations and soil . 64
9 Conductors and earth wires . 65
9.2 Aluminium based conductors . 65
9.2.1 Characteristics and dimensions . 65
9.2.3 Conductor service temperatures and grease characteristics . 66
9.3 Steel based conductors . 66
9.3.1 Characteristics and dimensions . 66
9.3.3 Conductor service temperatures and grease characteristics . 67
9.3.4 Mechanical requirements . 67
9.4 Copper based conductors . 68
9.6 General requirements . 69
9.6.2 Partial factor for conductors . 69
9.6.3 Minimum cross sections . 70
9.6.4 Sag-tension calculations . 70
10 Insulators . 71
10.1 Introduction . 71
10.7 Mechanical requirements . 71
10.9 Material selection and specification . 73
10.10 Characteristics and dimensions of insulators . 73
11 Hardware . 73
11.1 Introduction . 73
11.2 Electrical requirements . 73
11.2.1 Requirements applicable to all fittings. 73
11.2.2 Requirements applicable to current carrying fittings . 74
11.6 Mechanical requirements . 74
12 Quality assurance, checks and taking-over . 76
Annex G (normative) Calculation methods for earthing systems . 77
G.4 Touch voltage and body current . 77
G.4.1 Equivalence between touch voltage and body current . 77
Annex J (normative) Angles in lattice steel towers . 78

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J.2 General . 78
J.3 Tensile resistance of angles connected through one leg . 78
J.4 Buckling resistance of angles in compression . 79
J.4.1 Flexural buckling resistance . 79
J.4.3 Slenderness of members . 79
J.4.3.2 Leg members and chords . 79
J.4.3.3 Primary bracing pattern . 80
J.4.3.4 Compound members . 84
J.4.4 Secondary (or redundant) bracing members . 84
J.5 Design resistance of bolted connections . 85
J.5.1 General . 85
Annex M (informative) Geotechnical and structural design of foundations . 86
M.3 Sample semi-empirical models for resistance estimation . 86
M.3.1 Geotechnical design by calculation . 86
M.3.1.1 General. 86
M.3.1.2 Monoblock foundations . 86
M.3.1.3 Slab foundations . 86
M.3.1.4 Grillage-typ slab foundations . 86
M.3.1.5 Single-pile foundations . 86
M.3.1.6 Separate stepped block foundations, pad and chimney foundations . 87
M.3.1.9 Pile foundations . 87
M.3.2 Structural design of concrete foundations . 87
Annex AA (informative) Assumptions for ice loads . 88
Literature. 90


Figures
Figure 4/DE.1 – Map of wind zones for the Federal Republic of Germany according to
DIN EN 1991-1-4/NA:2010-12 . 26
Figure 4/DE.2 – Wind action on conductors and resulting wind force in any wind direction .
...