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SLOVENSKI STANDARD
01-april-2019
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Overhead electrical lines exceeding AC 1 kV - Part 2-20: National Normative Aspects
(NNA) for ESTONIA (based on EN 50341-1:2012)
Ta slovenski standard je istoveten z: EN 50341-2-20:2018
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 50341-2-20
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2018
ICS 29.240.20 Supersedes EN 50341-2-20:2015
English Version
Overhead electrical lines exceeding AC 1 kV - Part 2-20:
National Normative Aspects (NNA) for ESTONIA (based on EN
50341-1:2012)
This European Standard was approved by CENELEC on 2018-11-26.
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
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50341-2-20:2018 E
Contents
European foreword .6
0 Introduction .7
0.7 Language .7
1 Scope .7
1.1 General .7
1.2 Field of application .7
2 Normative references, definitions and symbols .8
2.1 Normative references.8
3 Basis of design . 10
3.2 Requirements of overhead lines . 10
3.2.2 Reliability requirements. 10
3.2.3 Security requirements . 11
3.2.5 Strength coordination . 11
3.2.6 Additional considerations . 11
3.3 Limit states . 11
3.3.3 Serviceability limit states . 11
3.4 Actions . 11
3.4.2 Classification of actions by their variation in time . 11
4 Actions on lines . 12
4.1 Introduction . 12
4.3 Wind loads . 12
4.3.1 Field of application and basic wind velocity . 12
4.3.2 Mean wind velocity . 12
4.3.3 Mean wind pressure . 12
4.3.5 Wind forces on any overhead line component . 12
4.4 Wind forces on overhead line components . 13
4.4.1 Wind forces on conductors . 13
4.4.2 Wind forces on insulator sets . 13
4.4.3 Wind forces on lattice towers . 14
4.4.4 Wind forces on poles . 14
4.5 Ice loads . 14
4.5.1 General . 14
4.5.2 Ice forces on conductors . 14
4.6 Combined wind and ice loads . 14
4.6.1 Combined probabilities . 14
4.6.2 Drag factors and ice densities . 15
4.7 Temperature effects . 15
4.8 Security loads . 15
4.8.4 Mechanical conditions of application . 15
Estonia 3/49 EN 50341-2-20:2018
4.9 Safety Loads . 15
4.9.1 Construction and maintenance loads . 15
4.9.2 Loads related to the weight of linesmen . 16
4.10 Forces due to short-circuit currents . 16
4.11 Other special forces . 16
4.11.1 Avalanches, creeping snow . 16
4.11.2 Earthquakes . 16
4.11.3 Floating of ice, accidents of vessels . 16
4.11.4 Mining out areas . 17
4.12 Load cases . 17
4.12.1 General . 17
4.12.2 Standard load cases . 17
4.13 Partial factors for actions . 18
5 Electrical requirements . 19
5.1 Introduction . 19
5.2 Currents . 19
5.2.1 Nominal current . 19
5.2.2 Short-circuit currents . 19
5.3 Insulation co-ordination. 19
5.4 Classification of voltages and overvoltages. 19
5.4.1 General . 19
5.5 Minimum air clearance distances to avoid flashover . 20
5.5.1 General . 20
5.6 Load cases for calculation of clearances. 21
5.6.2 Maximum conductor temperature . 21
5.6.3 Wind loads for determination of electric clearances . 21
5.6.4 Ice loads for determination of electric clearances . 22
5.6.5 Combined wind and ice loads . 22
5.8 Internal clearances within the span and at the top of support . 22
5.9 External clearances . 22
5.9.1 General . 22
5.9.2 External clearances to ground in areas remote from buildings, roads, etc. . 23
5.9.3 External clearances to residential and other buildings . 23
5.9.5 External clearances to adjacent traffic routes. 25
5.9.6 External clearances to other power lines or overhead telecommunication lines. 25
5.9.7 External clearances to recreational areas (playgrounds, sports areas, etc.) . 26
5.9.8 External clearances to line crossing pipelines or adjacent pipelines, including gas and oil
pipelines . 30
5.9.9 Overhead lines adjacent to aerodromes. 31
5.10 Corona effect . 32
5.10.2 Audible noise . 32
5.10.3 Corona loss . 32
6 Earthing systems . 32
6.1 Introduction . 32
6.1.3 Earthing measures against lightning effects . 32
6.2 Ratings with regard to corrosion and mechanical strength. 32
6.2.1 Earth electrodes . 32
6.2.2 Earthing and bonding conductors .
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