BS EN 50341-2-5:2017 BSI Standards Publication Overhead electrical lines exceeding AC kV – Part 2-5: National Normative Aspects (NNA) for DENMARK (based on EN 50341-1:2012) BS EN 50341-2-5:2017 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 50341-2-5:2017 This standard, together with the following list of National Normative Aspect standards, supersedes BS EN 50423-3:2005 and BS EN 50341-3:2001: Country Code AT BE CH DE DK ES FI FR GB GR IE IS IT LU NL NO PT SE CZ EE PL SK Origin Ref Austrian National Committee Belgian National Committee Swiss National Committee German National Committee Danish National Committee Spanish National Committee Finnish National Committee French National Committee British National Committee Greek National Committee Irish National Committee Iceland National Committee Italian National Committee Luxemburg National Committee Nederland’s National Committee Norwegian National Committee Portuguese National Committee Swedish National Committee Czech National Committee Estonian National Committee Polish National Committee Slovak National Committee BS EN 50341-2-1 BS EN 50341-2-2 BS EN 50341-2-3 BS EN 50341-2-4:2016 BS EN 50341-2-5:2017 BS EN 50341-2-6 BS EN 50341-2-7:2015 BS EN 50341-2-8 BS EN 50341-2-9:2015 BS EN 50341-2-10 BS EN 50341-2-11 BS EN 50341-2-12 BS EN 50341-2-13:2017 No NNA available BS EN 50341-2-15 BS EN 50341-2-16:2016 BS EN 50341-2-17 BS EN 50341-2-18 BS EN 50341-2-19:2015 BS EN 50341-2-20:2015 BS EN 50341-2-22:2016 BS EN 50341-2-23:2016 BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon publication of the rest of the series The UK participation in its preparation was entrusted to Technical Committee PEL/11, Overhead Lines A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2017 Published by BSI Standards Limited 2017 ISBN 978 580 97923 ICS 29.240.20 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017 Amendments/corrigenda issued since publication Date Text affected BS EN 50341-2-5:2017 EN 50341-2-5 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM February 2017 ICS 29.240.20 English Version Overhead electrical lines exceeding AC kV - Part 2-5: National Normative Aspects (NNA) for DENMARK (based on EN 50341-1:2012) Lignes électriques aériennes dépassant kV en courant alternatif - Partie 2-5: Aspects normatifs nationaux (NNA)pour le DANEMARK (basé sur l'EN 50341-1:2012) This European Standard was approved by CENELEC on 2017-02-01 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: Avenue Marnix 17, B-1000 Brussels © 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 50341-2-5:2017 E BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 -2/12- Contents Denmark Page European foreword Scope 1.1 DK.1 Reliability levels Normative references, definitions and symbols 2.1 DK.1 Normative references 2.3 DK.1 Symbols Basis of design 3.2 Requirements of overhead lines 3.2.2 DK.1 Reliability levels Actions on lines 4.1 DK.1 Introduction 4.3 Wind loads 4.3.1 DK.1 Field of application and basic wind velocity Table 4.3.1/DK.1 - Reference wind speeds in Denmark 4.3.3 DK.1 Mean wind pressure 4.4 Wind forces on overhead line components 4.4.1 Wind forces on conductors 4.4.1.1 DK.1 General DK.2 General 4.4.1.3 DK.1 Drag factor 4.4.3 Wind forces on lattice towers 4.4.3.1 DK.1 General 4.4.4 DK.1 Wind forces on poles 4.5 Ice loads 4.5.1 DK.1 General 4.5.2 DK.1 Ice forces on conductors 4.6 Combined wind and ice loads 4.6.6 Combination of wind velocity and ice loads 4.6.6.1 DK.1 Extreme ice load IT combined with a high probability wind velocity VIH 4.6.6.2 DK.1 Nominal ice load l3 combined with a low probability wind velocity VIL 4.7 DK.1 Temperature effects 4.8 Security loads 4.8.2 DK.1 Torsional loads 4.8.3 DK.1 Longitudinal loads 4.12 Load cases 4.12.1 DK.1 General 4.12.2 DK.1 Standard load cases 4.13 DK.1 Partial factors for actions Electrical requirements 5.6 Load cases for calculation of clearances 5.6.1 DK.1 Load conditions 5.6.2 DK.1 Maximum conductor temperature 5.6.3 DK.1 Wind loads for determination of electric clearances 5.6.3.2 DK.1 Nominal wind loads for determination of internal and external clearances 10 5.6.4 DK.1 Ice loads for determination of electric clearances 10 5.6.5 DK.1 Combined wind and ice loads 10 5.8 DK.1 Internal clearances within the span and at the top of support 10 5.9 External clearances 10 5.9.3 DK.1 External clearances to residential and other buildings 10 5.9.4 DK.1 External clearances to crossing traffic routes 10 5.9.7 DK.1 External clearances to recreational areas (playgrounds, sports areas, etc.) 10 Earthing systems 11 Supports 11 7.1 Initial design considerations 11 7.1.1 DK.1 Introduction 11 7.2.1 DK.1 Steel materials, bolts, nuts and washers, welding consumables 11 Denmark -3/12- 50341-2-5:2017 BSBS ENEN 50341-2-5:2017 EN 50341-2-5:2017 7.2.4 DK.1 Holding-down bolts 11 7.3.6 Ultimate limit states 11 7.3.6.1 DK.1 General 11 7.4.6.1 DK.1 General 11 7.4.8 Resistance of connections 11 7.4.8.3 DK.1 General 11 7.6.4 DK.1 Ultimate limit states 11 Foundations 12 8.2.2 DK.1 Geotechnical design by calculation 12 8.3 DK.1 Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3) 12 Conductors and earth-wires 12 10 Insulators 12 10.1 DK.1 Introduction 12 10.7 DK.1 Mechanical requirements 12 11 Hardware 12 12 Quality assurance, checks and taking-over 12 BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 -4/12- Denmark European foreword The Danish National Committee (NC) is identified by the following address: Dansk Standard Göteborg Plads DK-2150 Nordhavn Phone no +45 39 96 61 01 E-mail: dansk.standard@ds.dk The Danish NC has prepared this Part 2-5 of EN 50341, listing the Danish national normative aspects, under its sole responsibility, and duly passed it through the CENELEC and CLC/TC 11 procedures NOTE The Danish NC also takes sole responsibility for the technically correct coordination of this EN 50341-25 with EN 50341-1:2012 It has performed the necessary checks in the frame of quality assurance/control It is noted however that this quality assurance/control has been made in the framework of the general responsibility of a standards committee under the national laws/regulations This EN 50341-2-5 is normative in Denmark and informative for other countries This EN 50341-2-5 has to be read in conjunction with EN 50341-1:2012, hereinafter referred to as Part All clause numbers used in this Part 2-5 correspond to those of Part Specific sub clauses, which are prefixed “DK”, are to be read as amendments to the relevant text in Part Any necessary clarification regarding the application of Part 2-5 in conjunction with Part shall be referred to the Danish NC who will, in cooperation with CLC/TC 11 clarify the requirements When no reference is made in Part 2-5 to a specific sub clause, then Part applies In the case of “boxed values” defined in Part 1, amended values (if any) which are defined in Part 2-5 shall be taken into account in Denmark However any “boxed values“, whether in Part or Part 2-5, shall not be amended in the direction of greater risk in a Project Specification The national Danish standards/regulations related to overhead electrical lines exceeding kV (AC) are identified in 2.1/DK1 NOTE All national standards referred to in this Part 2-5 will be replaced by the relevant European Standards as soon as they become available and are declared by the Danish NC to be applicable and thus reported to the secretary of CLC/TC 11 Denmark Scope (snc) 1.1 (ncpt) -5/12- 50341-2-5:2017 BSBS ENEN 50341-2-5:2017 EN 50341-2-5:2017 This Part 2-5 is applicable for new permanent overhead lines only and generally not for existing lines in Denmark If some planning/design or execution work on existing lines in Denmark has to be performed, the degree of application of this Standard shall be agreed upon by the parties concerned and the authorities DK.1 General Installations in the planning and construction stage may be completed adopting the standard edition valid at the beginning of planning Normative references, definitions and symbols 2.1 DK.1 (A-dev) Normative references Lov nr 525 af 29/04/2015 Lov om sikkerhed ved elektriske anlæg, elektriske installationer og elektrisk materiel (Elsikkerhedsloven) Act No 525 - 29/04/2015 Act on the Safety of Electrical Plants, Electrical Installations and Electrical Equipment (the Electrical Safety Act) Bekendtgørelse nr 1114 af 18/08/2016 Bekendtgørelse om sikkerhed for udførelse af elektriske anlæg Executive Order no 1114 - 18/08/2016 Executive Order on Safety in connection with the Construction of Electrical Plants 2.3 (ncpt) DK.1 Symbols Symbol Signification Reference L Length of the intact span [m] 4.8.2/DK.1 E Modulus of elasticity of the conductor [N/mm2] 4.8.2/DK.1 γ Weight of the conductor including possible external 4.8.2/DK.1 Load divided by the cross-sectional area [N/m/mm2] σ Tensile stress in the conductor prior to breakage [N/mm2] 4.8.2/DK.1 I Max movement of movable suspension in the direction 4.8.2/DK.1 of the line [m] u Deflection of the support in the direction of the line at the 4.8.2/DK.1 attachment point of the insulator [m] d Horizontal conductor swing [m] 5.6.3.2/DK.1 BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 -6/12- Denmark y0 Overhead line sag at 0°C [m] 5.6.3.2/DK.1 Ik Distance from the attachment point of the conductor 5.6.3.2/DK.1 and the turning point of the insulator string [m] Basis of design 3.2 Requirements of overhead lines 3.2.2 DK.1 Reliability requirements (ncpt) One reliability level generally applies corresponding to level Actions on lines 4.1 DK.1 Introduction (snc) 4.3 For assessment of climatic data to determine numerical values for action approach is applied Wind loads 4.3.1 DK.1 Field of application and basic wind velocity (snc) The basic wind velocity, Vb,0 can be taken as given in Table 4.3.1 below Table 4.3.1/DK.1 - Reference wind speeds in Denmark Part of the country Reference wind speed The whole of Denmark, however with the exceptions mentioned below 24 m/s The west coast of Jutland 27 m/s From the west coast line of Jutland and 25 km inland Linear declination from 27 m/s to 24 m/s Further information can be found in DS/EN 1991-1-4 DK NA 4.3.3 DK.1 Mean wind pressure (snc) 4.4 4.4.1 Density of air of ρ=1.25 kg/m3 is used in Denmark This is independent of temperature and altitude Wind forces on overhead line components Wind forces on conductors 4.4.1.1 DK.1 General (ncpt) (ncpt) Method in Table 4.3 should be used for the determination of the reference height above ground, h of the conductors DK.2 General For calculation of the mechanical tension in a section, the equivalent mean section length should be used as the span length Denmark -7/12- 50341-2-5:2017 BSBS ENEN 50341-2-5:2017 EN 50341-2-5:2017 4.4.1.3 DK.1 Drag factor (npct) Method or shall be used for determination of the drag factor of the conductors 4.4.3 Wind forces on lattice towers 4.4.3.1 DK.1 General (npct) Method should be used for determining the wind forces on the tower itself 4.4.4 DK.1 Wind forces on poles (ncpt) Method is used for determination of the reference height for the pole The reference height should be 60% of the total height 4.5 Ice loads 4.5.1 DK.1 General (ncpt) No ice loads apply on insulators or towers DK.2 Characteristic ice load (snc) The characteristic ice load, I, on a conductor with the diameter d in mm is I = 12 + 0.9 d [N/m] The ice is considered as glaze ice For a 30 mm conductor the value reflects a 50-year return period load Density of ice is 900 kg/m3 4.5.2 DK.1 Ice forces on conductors (ncpt) The vertical ice force on a support from each sub-conductor is QI = I (LW1+LW2)/2 4.6 Combined wind and ice loads 4.6.6 Combination of wind velocity and ice loads 4.6.6.1 (snc) ΨW = 0.4 Only the extreme ice load combined with the reduced wind load have to be investigated, i.e I = 4.6.6.2 (snc) DK.1 Extreme ice load IT combined with a high probability wind velocity VIH DK.1 Nominal ice load l3 combined with a low probability wind velocity VIL This situation should not be investigated in Denmark 4.7 (snc) DK.1 Temperature effects The following temperature effects should be considered: a) A minimum temperature to be considered with no other climatic action: -20 °C b) A normal ambient reference temperature assumed for the extreme wind velocity condition: °C c+d) Not relevant e) A temperature to be used for the combination of wind and ice: °C 4.8 Security loads BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 4.8.2 (ncpt) -8/12- Denmark DK.1 Torsional loads The β-method shall be applied and calculated in accordance with an accepted model, simulating the residual situation after a conductor breakage Simplified β can be found using the diagram in Figure 4.8.2/DK.1 Figure 4.8.2/DK.1 - Tension reduction factor where: X = E L γ ; σ σ Y = E I +u σ L L the length of the intact span [m] E the modulus of elasticity of the conductor [N/mm²] γ the weight of the conductor including possible external load divided by the cross-sectional area [N/m/mm²] σ the tensile stress in the conductor prior to breakage [N/mm²] I the max movement of movable suspension in the direction of the line [m] u the deflection of the support in the direction of the line at the attachment point of the insulator [m] NOTE The basis of the simplified method is reported in CIGRÉ paper 22-10, 1976 The number of released conductors is as follows: - single and double circuit lines multiple circuit lines The number of broken sub-conductors in a bundle conductor can be taken as half the sum of sub-conductors Denmark -9/12- 50341-2-5:2017 BSBS ENEN 50341-2-5:2017 EN 50341-2-5:2017 The partial factor, γA1, to be 1.5, however for secondary parts of suspension supports, i.e tower peak and cross-arm peaks which not support other conductors, the partial factor, γA1, may be reduced to 1.0 4.8.3 (ncpt) 4.12 DK.1 Longitudinal loads The β-method shall be applied and calculated in accordance with an accepted model, simulating the residual situation after breakage of all conductors including all sub-conductors in bundle conductors, overhead ground wires, etc on one side of the support The simplified method as given in 4.8.2/DK.1 can be used Derived β-values are multiplied by 0.80 Load cases 4.12.1 DK.1 General (ncpt) The same sub clauses shall apply for overhead lines exceeding a nominal system voltage AC kV up to and including AC 45 kV as for overhead lines exceeding a nominal system voltage AC 45 kV 4.12.2 DK.1 Standard load cases (ncpt) The following reduction factors shall be used: α = 0.0 α1 = 0.0 α2 = 0.5 on all spans α3 = 0.0 α4 = 0.0 NOTE Attention should be paid to the limited effect of unbalanced ice loads on suspension supports as referred to in the note in 4.8.3 4.13 (snc) DK.1 Partial factors for actions Partial factors on Torsional security loads are given in section 4.8.2/DK.1 Electrical requirements 5.6 Load cases for calculation of clearances 5.6.1 DK.1 (ncpt) 5.6.2 DK.1 (ncpt) 5.6.3 DK.1 Load conditions Load cases for calculation of clearances Three different load cases have to be considered in Denmark: - Maximum conductor temperature (given in 5.6.2/DK.1) - Nominal wind load (given in 5.6.3.3/DK.1) - Ice loads (given in 5.6.4/DK.1) - Extreme Ice load - Uneven Ice load The load cases are detailed below Maximum conductor temperature The clearances should be based on the maximum continuous service temperature of the conductor specified in the Project Specification Wind loads for determination of electric clearances BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 5.6.3.2 DK.1 (ncpt) -10/12- Denmark Nominal wind loads for determination of internal and external clearances For external clearances the following method shall be used: On a given location X in a conductor span between two towers the value of the horizontal conductor swing (d) under wind influence is determined as follows: d = 0.75⋅(y0 + lk) y0 is the overhead line sag (in metres) at the point X at °C lk is the distance (in metres) from the attachment point of the conductor and the turning point of the insulator string If lk is different at the two end points of a span, the mean value shall be used By using post insulators or V-string insulators lk = is used (ncpt) 5.6.4 (ncpt) DK.2 Galloping condition The conductor deflection for Galloping Condition shall be investigated according to the Project Specification DK.1 Ice loads for determination of electric clearances For all not specified clearances the specified ice load given in 4.5.1/DK.2, shall be used Uneven ice load: Uneven ice load is calculated as the half of the ice load defined in 4.5.1/DK.2 and shall be assumed in the crossing span and no ice load in all the other spans of the line section Uneven ice load is to be applied in addition to extreme ice load in table 5.11 and 5.12 5.6.5 (snc) 5.8 (ncpt) 5.9 5.9.3 (ncpt) 5.9.4 (ncpt) 5.9.7 (ncpt) DK.1 Combined wind and ice loads A verification of clearances under combined wind and ice loads is not required DK.1 Internal clearances within the span and at the top of support k1 is defined as 0.7 for use in table 5.8 and annex F External clearances DK.1 External clearances to residential and other buildings It is not allowed in Denmark for overhead lines to cross buildings with non-fire resistant roofs and fire sensitive installations Following addition to table 5.11 are valid for protection system B: Uneven Ice load: To clearance case: ‘With fire resistant roofs where the slope is less than or equal to 15°to the horizontal’: m + Del but at least m For other clearance cases: m + Del but at least m DK.1 External clearances to crossing traffic routes Following addition to table 5.12 are valid for protection system B: Uneven Ice load: To clearance case: ‘Top of road’: 4.5 m + Del - For other clearance cases: Del DK.1 External clearances to recreational areas (playgrounds, sports areas, etc.) It is not allowed in Denmark for overhead lines to cross sport facilities and swimming pools Denmark -11/12- 50341-2-5:2017 BSBS ENEN 50341-2-5:2017 EN 50341-2-5:2017 Earthing systems Part applies without change Supports 7.1 Initial design considerations 7.1.1 DK.1 (ncpt) Introduction Where Eurocodes are specified in the standard, these codes are valid without applying the Danish National Annex Boxed values of partial factors are used, unless stated otherwise in this standard or the present National Complements 7.2 Materials 7.2.1 DK.1 (ncpt) 7.2.4 (ncpt) Steel materials, bolts, nuts and washers, welding consumables The Execution Class according to EN 1090-2 is normally EXC EXC or EXC may be chosen in Project Specification DK.1 Holding-down bolts Straight undeformed anchors (Annex K.6) are not allowed for round bars without bends or plates 7.3 Lattice steel towers 7.3.6 Ultimate limit states 7.3.6.1 DK.1 General (ncpt) 7.4 7.4.6.1 (ncpt) For lattice steel towers the following partial coefficients shall be used: 1.1 γM0 = 1.1 γM1 = 1.25 γM2 = Steel poles DK.1 General For steel poles the following partial coefficients shall be used: 1.1 γM0 = 1.1 γM1 = 1.25 γM2 = 7.4.8 Resistance of connections 7.4.8.3 DK.1 General (ncpt) For slip joints the conicity of the pole body based on the diameter shall be >10 mm/m 7.6 Concrete poles 7.6.4 DK.1 Ultimate limit states (ncpt) For concrete poles the following partial coefficients shall be used: 1.45 γMC = 1.2 γMS = BS EN 50341-2-5:2017 BS EN 50341-2-5:2017 EN 50341-2-5:2017 -12/12- Foundations 8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) 8.2.2 DK.1 (ncpt) Denmark Geotechnical design by calculation Methods for Geotechnical design shall follow the methods given in EN 1997-1 DK NA Driven piles should be analysed according to the method described in EN 1997-1 DK NA, Annex L For ground properties the following partial factors for soil parameters shall be used: 1.2 γφ’ = 1.2 γc’ = 1.8 γcu = The partial factors for driven piles should be: γ = 1.3 Other values for partial factors and correlation factors should be taken from EN 1997-1 DK NA Pile foundation For pile foundations the resistance is calculated according to 8.2.2 with the following partial factors: γ = 1.8 (For resistance found without load test) γ = 1.4 (For resistance found with load test) γ = 1.3 (For resistance where the actual pile has been tested) 8.3 (ncpt) DK.1 Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3) The structure of the soil below surface, down to a depth greater than two times the footing effective width, and in case of a piled foundation, greater than the pile tip depth, shall be known in sufficient detail Conductors and earth-wires Part applies without change 10 10.1 (ncpt) 10.7 (ncpt) Insulators DK.1 Introduction Fail safe insulators should be used when crossing highways and main roads Fail safe insulators are cap and pin insulators Alternatively, shall double long rod or composite insulators be used DK.1 Mechanical requirements The partial material factor for all types of insulators shall have a minimum value of: γm =2.0 11 Hardware Part applies without change 12 Quality assurance, checks and taking-over Part applies without change This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Reproducing extracts We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions For permission to reproduce content from BSI publications contact the BSI Copyright & Licensing team The knowledge embodied in our 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