EN 50341-2-24:2019

Overhead electrical lines exceeding AC 1 kV - Part 2-24: National Normative Aspects (NNA) for Romania (based on EN 50341-1:2012)

1.1 General 1.1 RO.1 General (ncpt) This Part 2-24 gives the requirements for planning, design and construction of overhead electrical lines with nominal voltages exceeding A.C. 1 kV operating at 50 Hz frequency. The present Part 2-24 is not applicable for existing overhead electrical lines unless specifically required by Project Specification. The power installations of overhead lines, that are in different stages of design or construction, can be finalised in conformity with the standards in force at project beginning. For the application of this standard for specific requirements relaring to modernization, increasing safety and transport capacity of existing overhead 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 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 with insulated conductors (ncpt) This Part 2-24 is applicable for the design and construction of overhead electrical lines with insulated conductors where the internal and external clearances can be smaller than those specified in Part 1 (SR EN 50341-1:2013).

Lignes électriques aériennes dépassant 1 kV en courant alternatif - Partie 2-24 : Aspects normatifs nationaux (NNA) pour la Roumanie (basés sur l'EN 50341-1:2012)

Nadzemni električni vodi za izmenične napetosti nad 1 kV - 2-24. del: Nacionalna normativna določila (NNA) za Romunijo (na podlagi EN 50341-1:2012)

1.1 Splošno
1.1 RO.1 Splošno
(NCPT) 2-24. del tega standarda določa zahteve za projektiranje, načrtovanje in izgradnjo nadzemnih električnih vodov za nazivne izmenične napetosti nad 1 kV, ki delujejo pri frekvenci 50 Hz.
Ta 2-24. del se ne uporablja za obstoječe nadzemne električne vode, razen če tega izrecno ne zahteva projektna specifikacija. Električne inštalacije nadzemnih vodov na različnih stopnjah projektiranja oziroma izgradnje je mogoče dokončati v skladu s standardi, ki so v veljavi ob začetku projekta.
Uporaba tega standarda za posebne zahteve v zvezi z modernizacijo ter povečevanjem varnostne in transportne zmogljivosti obstoječih nadzemnih vodov mora biti s sklicem opredeljena v projektni specifikaciji. Obenem je treba v projektni specifikaciji vzpostaviti korelacijo med ustreznimi predpisi in povezanimi standardi.
Podaljšek obstoječega električnega voda se obravnava kot nov nadzemni vod, razen stičišč, ki jih je treba podrobneje opredeliti v projektni specifikaciji.
1.2 Področje uporabe
1.2 RO.1 Nadzemni električni vodi z izoliranimi vodniki
(NCPT) 2-24. del tega standarda se uporablja za projektiranje in izgradnjo nadzemnih električnih vodov z izoliranimi vodniki, pri čemer so notranje in zunanje razdalje lahko krajše od razdalj, navedenih v 1. delu standarda (SR EN 50341-1:2013).

General Information

• Status: Published
• Publication Date: 21-Feb-2019
• Withdrawal Date: 21-Nov-2021
• ICS: 29.240.20 - Power transmission and distribution lines
• Technical Committee: CLC/TC 11 - Overhead electrical lines exceeding 1 kV a.c. (1,5 kV d.c.)
• Drafting Committee: CLC/TC 11 - Overhead electrical lines exceeding 1 kV a.c. (1,5 kV d.c.)
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 22-Feb-2019
• Completion Date: 22-Feb-2019
• Ref Project: SIST EN 50341-2-24:2019 - Overhead electrical lines exceeding AC 1 kV - Part 2-24: National Normative Aspects (NNA) for Romania (based on EN 50341-1:2012)

Standards Content (Sample)

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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