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SLOVENSKI STANDARD
01-december-2019
Nadzemni električni vodi za izmenične napetosti nad 1 kV - 2-24. del: Nacionalna
normativna določila (NNA) za Romunijo (na podlagi EN 50341-1:2012)
Overhead electrical lines exceeding AC 1 kV - Part 2-24: National Normative Aspects
(NNA) for Romania (based on EN 50341-1:2012)
Lignes électriques aériennes dépassant 1 kV en courant alternatif - Partie 1: Exigences
générales - Spécifications communes
Ta slovenski standard je istoveten z: EN 50341-2-24:2019
ICS:
29.240.20 Daljnovodi Power transmission and
distribution lines
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN 50341-2-24
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-24:
National Normative Aspects (NNA) for Romania (based on EN
50341-1:2012)
This European Standard was approved by CENELEC on 2018-11-22.
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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-24:2019 E
Contents
Page
Foreword . 4
0 Introduction. 5
0.7 Language . 5
1 Scope . 5
1.1 General . 5
1.2 Field of application. 5
2 Normative references, definitions and symbols . 5
2.1 Normative references . 5
2.2 Definitions . 11
2.3 Symbols . 18
3 Basis of design . 20
3.2 Requirements of overhead lines . 20
3.2.1 Basic requirements . 20
3.2.2 Reliability requirements . 20
3.2.5 Strength coordination . 20
3.2.6 Additional considerations . 21
4 Actions on lines . 21
4.1 Introduction . 21
4.3 Wind loads . 21
4.4 Wind forces on overhead line components . 23
4.4.1 Wind forces on conductors . 23
4.4.3 Wind forces on lattice towers . 23
4.4.3.2 Method 1 . 23
4.5 Ice loads . 24
4.5.1 General . 24
4.5.2 Ice forces on conductors . 24
4.6 Combined wind and ice loads . 24
4.6.1 Combined probabilities . 24
4.6.4 Equivalent diameter D of ice covered conductor . 27
4.6.5 Wind forces on support for ice covered conductors. 27
4.6.6 Combination of wind velocities and ice loads . 28
4.9 Safety loads . 30
4.9.1 Construction and maintenance loads . 30
4.9.2 Loads related to the weight of linesmen . 30
4.10 Forces due to short-circuit currents . 30
4.11 Other special forces . 30
4.12 Load cases . 32
4.12.1 General . 32
4.12.2 Standard load cases . 33
5 Electrical requirements . 38
5.2 Currents . 38
5.2.1 Normal current . 38
5.2.2 Short-circuit current . 38
5.7 Coordination of conductor positions and electrical stresses . 39
5.8 Internal clearances within the span and at the top of support . 39
5.9 External clearances . 42
5.9.1 General . 42
6 Earthing systems . 44
6.1.3 Earthing measures against lightning effects . 45
7 Supports . 47
7.1 Initial design considerations . 47
7.2 Materials . 47
7.3 Lattice steel towers . 47
7.3.1 General . 47
Romania 3/61 EN 50341-2-24:2019
7.3.5 Structural analysis . 47
7.3.6 Ultimate limit states . 49
7.3.6.1 General . 49
7.3.6.3 Tension, bending and compression resistance of members . 49
7.3.8 Resistance of connections . 49
7.4 Steel poles . 50
7.4.1 General . 50
7.4.6.2 Resistance of cross section areas . 50
7.9 Corrosion protection and finishes . 51
7.10 Maintenance facilities . 51
7.10.2 Maintainability . 51
7.10.3 Safety requirements . 51
8 Foundations . 51
8.2 Basis of geotechnical design . 51
8.2.1 General . 51
8.6 Intercations between support foundations and soil . 52
9 Conductors and earth-wires. 52
9.1 Introduction . 52
9.2 Aluminium based conductors . 52
9.2.1 Characteristics and dimensions . 52
9.2.3 Conductor service temperatures and grease characteristics . 52
9.3 Steel based conductors . 53
9.3.1 Characteristics and dimensions . 53
9.3.5 Corrosion protection . 53
9.6 General requirements . 53
9.6.1 Avoidance of damage . 53
9.6.2 Partial factor for conductors . 53
9.6.4 Sag - tension calculations . 54
10 Insulators . 56
10.2 Standard electrical requirements . 56
10.4 Pollution performance requirements . 58
10.5 Power arc requirements . 58
10.6 Audible noise requirements . 58
10.7 Mechanical requirements . 58
10.16 Selection, delivery and installation of insulators . 59
11 Hardware . 60
11.4 Magnetic characteristics . 60
11.6 Mechanical requirements . 60
12 Quality as
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