EN 50341-2-9:2015

Overhead electrical lines exceeding AC 1 kV - Part 2-9: National Normative Aspects (NNA) for Great Britain and Northern Ireland (based on EN 50341-1:2012)

This NNA is only applicable to all new overhead lines above A.C. 1kV. This Euronorm is only applicable to new overhead lines and shall not be applied to maintenance, reconductoring, tee-offs, extensions or diversions to existing overhead lines unless specifically required by the Project Specification. For details of the application of this standard for overhead lines constructed with covered conductor refer to the Project Specification. For details of the application of this standard to telecommunication systems involving optical fibres either incorporated in or wrapped around earthwires or conductors or suspended from overhead line supports, reference should be made to the Project Specification.

Nadzemni električni vodi za izmenične napetosti nad 1 kV - 2-9. del: Nacionalna normativna določila (NNA) za Združeno kraljestvo (na podlagi EN 50341-1:2012)

Ta standard velja le za vse nove nadzemne vode z napetostjo pri izmeničnem toku nad 1 kV. Ta normativ Euronorm velja le za nove nadzemne vode in ne velja za vzdrževanje, zamenjavo napeljave, odcepne prenosne tokokroge, podaljške ali preusmeritve v zvezi z obstoječimi nadzemnimi vodi, razen če tega izrecno ne zahteva projektna specifikacija. Za podrobnejše informacije o uporabi tega standarda za nadzemne vode, izdelane z izoliranim vodnikom, glej projektno specifikacijo. Za podrobnejše informacije o uporabi tega standarda za telekomunikacijska omrežja, ki vključujejo optična vlakna, vgrajena v zaščitne vrvi ali vodnike ali ovita vanje oziroma visijo s podpor nadzemnih vodov, glej projektno specifikacijo.

General Information

• Status: Withdrawn
• Publication Date: 25-Jun-2015
• Withdrawal Date: 01-Jun-2018
• 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: 9960 - Withdrawal effective - Withdrawal
• Start Date: 26-Apr-2020
• Completion Date: 26-Apr-2020
• Ref Project: SIST EN 50341-2-9:2016 - Overhead electrical lines exceeding AC 1 kV - Part 2-9: National Normative Aspects (NNA) for GREAT BRITAIN AND NORTHERN IRELAND (based on EN 50341-1:2012)

Relations

• Replaced By: EN 50341-2-9:2017 - Overhead electrical lines exceeding AC 1 kV - Part 2-9: National Normative Aspects (NNA) for Great Britain and Northern Ireland (based on EN 50341-1:2012)
• Effective Date: 09-May-2017

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2016
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QRUPDWLYQDGRORþLOD11$]D=GUXåHQRNUDOMHVWYRQDSRGODJL(1
Overhead electrical lines exceeding AC 1 kV - Part 2-9: National Normative Aspects
(NNA) for GREAT BRITAIN AND NORTHERN IRELAND (based on EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-9:2015
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 50341-2-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2015
ICS 29.240.20
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-9: National
Normative Aspects (NNA) for Great Britain and Northern Ireland
(based on EN 50341-1:2012)
This European Standard was approved by CENELEC on 2015-06-02.
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
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-9:2015 E
CONTENTS
1 Scope . 6
1.1 General . 6
2 Normative References, definitions and symbols . 6
2.1 Normative references . 6
2.3 Symbols . 7
3 Basis of design . 7
3.2 Requirements of overhead lines . 7
3.2.2 Reliability requirements . 7
3.2.5 Strength coordination . 7
3.2.6 Additional considerations . 7
3.3 Limit states . 7
3.3.3 Serviceability limit states . 7
4 Actions on lines . 8
4.1 Introduction . 8
4.3 Wind loads . 8
4.3.1 Field of application and basic wind velocity . 8
4.3.2 Mean wind velocity . 8
4.3.3 Mean wind pressure . 9
4.4 Wind forces on overhead line components . 9
4.4.1 Wind forces on conductors . 10
4.4.3 Wind forces on lattice towers . 10
4.5 Ice loads . 11
4.6 Combined Wind and Ice loads . 12
4.7 Temperature effects . 13
4.8 Security loads . 13
4.9 Safety loads . 14
4.9.1 Construction and maintenance loads . 14
4.9.2 Loads related to the weight of linesmen . 14
4.10 Forces due to short-circuit currents . 14
4.11 Other special forces . 14
4.12 Load cases . 14
4.12.2 Standard load cases . 14
4.13 Partial factors for actions . 15
5 Electrical requirements . 18
5.2 Currents . 18
5.2.1 Normal current . 18
5.2.2 Short circuit current . 18

Great Britain and Northern Ireland -3/34- EN 50341-2-9:2015

5.5 Minimum air clearance distances to avoid flashover . 19
5.5.3 Empirical method based on European experience. 19
5.6 Load cases for calculation of clearances. 19
5.6.1 Load cases for calculation of clearances . 19
5.6.3 Wind load for determination of electric clearances . 19
5.6.4 Ice load for determination of electric clearances . 19
5.6.5 Combined wind and ice loads. 19
5.8 Internal clearances within the span and at the top of support . 19
5.9 External clearances . 20
5.9.1 General . 20
5.9.4 External clearances to crossing traffic routes . 20
5.9.6 External clearances to other power lines or overhead telecommunication lines . 21
5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 21
5.10 Corona effect . 21
5.10.2 Audible noise . 21
5.10.3 Corona loss . 21
5.11 Electrical and magnetic field . 21
5.11.1 Electrical and magnetic fields under a line . 21
6 Earthing Systems . 21
6.2 Ratings with regard to corrosion and mechanical strength. 21
6.2.1 Earth electrodes . 21
6.4 Dimensioning with regard to human safety . 21
7 Supports . 22
7.3 Lattice steel towers . 22
7.3.6 Ultimate limit states . 22
7.4 Steel poles . 22
7.4.5 Structural analysis . 22
7.4.6 Ultimate limit states . 22
7.5 Wood Poles . 23
7.5.1 General . 23
7.5.5 Ultimate limit states . 23
7.7 Guyed structures . 24
8. Foundations. 24
8.2 Basis of geotechnical design . 24
8.2.2 Geotechnical design . 24
8.2.3 Design by prescriptive measures . 24
8.2.4 Load tests and tests on experimental models . 24
8.4 Supervision of construction, monitoring and maintenance . 24
9. Conductor and earth wires . 24
10. Insulators . 25
10.10 Characteristics and dimensions of insulators . 25

11 Line equipment – overhead line fittings . 26
11.9 Characteristics and dimensions of insulator fittings . 26
12 Quality assurance, checks and taking-over . 26
Annex J Angles in lattice steel towers . 26
J.4 Buckling resistance of angles in compression (see 7.3.6.4) . 26
J.4.2 Effective non-dimensional slenderness for flexural buckling . 26
J.4.3 Slenderness of members . 26
J.4.3.3 Primary bracing patterns.
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