EN 50341-2-24:2024
(Main)Overhead electrical lines exceeding AC 1 kV - Part 2-24: National Normative Aspects (NNA) for Romania (based on 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)
General 1.1 RO.1 General (ncpt) This standard EN 50341-2-24 (Part 2-24) gives the requirements for design and construction of overhead electrical lines with nominal voltages exceeding A.C. 1 kV operating at 50 Hz frequency. This Part 2-24 applies to new overhead electrical lines, as well as in the following cases: - the extension of existing overhead electrical lines; - the deviation of some portions of the existing overhead electrical lines in accordance with the provisions of technical regulations in force issued by the National Energy Regulatory Authority (see article 39 of ANRE Order 25/2016); - new supports to be used for the replacement and/or relocation of existing supports. This Part 2-24 is not applicable for the existing overhead electrical lines unless specifically required by Project Specification. The overhead electrical lines, that are in different stages of design or construction, can be completed in conformity with the standards in force at the beginning of project. For the application of this standard for specific requirements relating to modernization, increasing safety and transport capacity of existing overhead electrical lines, reference shall be specified in the Project Specification. At the same time, the correlation between relevant regulations and associated standards shall be established in the Project Specifications. The extension of existing electrical lines is considered as new overhead electrical lines, except the junction points that shall be detailed in the Project Specifications. 1.2 Field of application 1.2 RO.1 Overhead electrical lines having uninsulated, pre-insulated and insulated conductors (ncpt) This Part 2-24 is applicable for the design and construction of overhead electrical lines with uninsulated, pre-insulated and insulated conductors where the internal and external clearances can be smaller than those specified in Part 1 (SR EN 50341-1:2013).
Nadzemni električni vodi za izmenične napetosti nad 1 kV - 2-24. del: Nacionalna normativna določila (NNA) za Romunijo (na podlagi EN 50341-1:2012)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2025
Nadomešča:
SIST EN 50341-2-24:2019
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)
Ta slovenski standard je istoveten z: EN 50341-2-24:2024
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 December 2024
ICS 29.240.20 Supersedes EN 50341-2-24:2019
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 2024-11-06. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-24:2024 E
Romania – 1/95 – EN 50341-2-24:2024
Contents Page
European foreword . 3
0 Introduction. 4
0.7 Language . 4
1 Scope . 4
1.1 General . 4
1.2 Field of application. 4
2 Normative references, definitions and symbols . 4
2.1 Normative references . 4
2.2 Definitions . 10
2.3 Symbols . 17
3 Basis of design . 21
3.2 Requirements of overhead lines . 21
3.2.1 Basic requirements . 21
3.2.2 Reliability requirements . 21
3.2.5 Strength coordination . 21
3.2.6 Additional considerations . 21
4 Actions on lines . 21
4.1 Introduction . 21
4.3 Wind loads . 22
4.3.1 Field of application and basic wind velocity . 22
4.4 Wind forces on overhead line components . 24
4.4.1 Wind forces on conductors . 24
4.4.3 Wind forces on lattice towers . 25
4.4.3.2 Method 1 . 25
4.5 Ice loads . 25
4.5.1 General . 25
4.5.2 Ice forces on conductors . 26
4.6 Combined wind and ice loads . 27
4.6.1 Combined probabilities . 27
4.6.4 Equivalent diameter D of an ice-covered conductor . 30
4.6.5 Wind forces on support for ice-covered conductors . 30
4.6.6 Combination of wind velocities and ice loads . 32
4.9 Safety loads . 34
4.9.1 Construction and maintenance loads . 34
4.9.2 Loads related to the weight of linesmen . 36
4.10 Forces due to short-circuit currents . 36
4.11 Other special forces . 36
4.12 Load cases . 38
4.12.1 General . 38
4.12.2 Standard load cases . 39
5 Electrical requirements . 46
5.2 Currents . 46
5.2.1 Normal current . 46
5.2.2 Short-circuit current . 46
5.7 Coordination of conductor positions and electrical stresses . 46
5.8 Internal clearances within the span and at the top of support . 47
5.9 External clearances . 51
5.9.1 General . 51
6 Earthing systems . 54
6.1.3 Earthing measures against lightning effects . 55
7 Supports . 57
7.1 Initial design considerations . 57
7.2 Materials . 57
7.3 Lattice steel towers . 58
7.3.1 General . 58
7.3.5 Structural analysis . 58
7.3.6 Ultimate limit states . 60
7.3.6.1 General . 60
7.3.6.3 Tension, bending and compression resistance of members. 60
7.3.8 Resistance of connections . 60
7.4 Steel poles . 62
7.4.1 General . 62
7.4.6.2 Resistance of cross section areas . 62
7.9 Corrosion protection and finishes . 62
7.10 Maintenance facilities . 63
7.10.2 Maintainability . 63
7.10.3 Safety requirements . 63
8 Foundations . 63
8.2 Basis of geotechnical design (EN 1997-1-1:2004 – Section 2) . 63
8.2.1 General . 63
8.6 Interaction between support foundations and soil . 63
9 Conductors and earth-wires. 64
9.1 Introduction . 64
9.2 Conductors for overhead electrical lines . 64
9.2.1 Characteristics and dimensions . 64
9.2.3 Conductor service temperatures and grease characteristics . 67
9.3 Steel based conductors . 67
9.3.1 Characteristics and dimensions . 67
9.3.5 Corrosion protection . 67
9.6 General requirements . 67
9.6.1 Avoidance of damage . 67
9.6.2 Partial factor for conductors . 68
9.6.4 Sag - tension calculations . 68
Figure 9/RO.1 — The diagrams of recommended tensile forces (see CIGRE Brochure no. 273
[1]) 69
10 Insulators . 69
10.2 Standard electrical requirements . 69
10.4 Pollution performance requirements . 71
10.5 Power arc requirements . 72
10.7 Mechanical requirements . 72
10.16 Selection, delivery and installation of insulators . 72
11 Hardware .
...
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