BS EN 50341-2-23:2016 BSI Standards Publication Overhead electrical lines exceeding AC kV Part 2-23: National Normative Aspects (NNA) for SLOVAKIA (based on EN 50341-1:2012) BS EN 50341-2-23:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 50341-2-23:2016 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 Origin Ref AT BE CH DE DK ES FI FR GB GR IE IS IT LU NL NO PT SE CZ EE SI PL 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 Slovak National Committee Polish 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 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 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BS EN 50341-2-20:2015 BS EN 50341-2-21:2016 BS EN 50341-2-22 BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon publication of the rest of the series The UK participation in its preparation was entrusted to Technical Committee PEL/11, Overhead Lines A list of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 2016 Published by BSI Standards Limited 2016 ISBN 978 580 95801 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 December 2016 Amendments/corrigenda issued since publication Date Text affected EUROPEAN STANDARD NORME EUROPÉENNE BS EN 50341-2-23:2016 EN 50341-2-23 EUROPÄISCHE NORM December 2016 ICS 29.240.20 English Version Overhead electrical lines exceeding AC kV - Part 2-23: National Normative Aspects (NNA) for SLOVAKIA (based on EN 50341-1:2012) Lignes électriques aériennes dépassant kV en courant alternatif - Partie 2-23: Aspects normatifs nationaux pour la SLOVAQUIE (basé sur l'EN 50341-1:2012) This European Standard was approved by CENELEC on 2016-09-20 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, 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 © 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members Ref No EN 50341-2-23:2016 E BS EN 50341-2-23:2016 EN 50341-2-23:2016 Contents Scope General Field of application Normative references, definitions and symbols 2.1 Normative references 2.2 Definitions 10 2.3 Symbols 10 Basis of design 12 3.2 Requirements of overhead lines 12 3.2.2 Reliability requirements 12 3.2.5 Strength coordination 12 3.2.6 Additional considerations 12 Actions on lines 13 4.3 Wind loads 13 4.3.1 Field of application and basic wind velocity 13 4.3.2 Mean wind velocity 13 4.3.3 Mean wind pressure 13 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 14 4.4.3 Wind forces on lattice towers 15 4.4.4 Wind forces on poles 15 4.5 Ice loads 15 4.5.1 General 15 4.6 Combined wind and ice loads 17 4.6.1 Combined probabilities 17 4.6.2 Drag factors and ice densities 17 4.6.5 Wind forces on support for ice covered conductors 17 4.6.6 Combination of wind velocities and ice loads 17 4.7 Temperature effects 18 4.8 Security loads 18 4.8.1 General 18 4.8.2 Torsional loads 18 4.8.3 Longitudinal loads 19 4.9 Safety loads 19 4.9.1 Construction and maintenance loads 19 4.9.2 Loads related to the weight of linesmen 19 4.10 Forces due to short-circuit currents 19 4.11 Other special forces 19 4.11.1 Avalanches, creeping snow 19 4.11.2 Earthquakes 20 4.12 Load cases 20 4.12.1 General 20 4.12.2 Standard load cases 20 4.13 Partial factors for actions 21 Electrical requirements 25 5.3 Insulation coordination 25 5.4 Classification of voltages and overvoltages 26 5.4.2 Representative power frequency voltages 26 5.5 Minimum air clearance distances to avoid flashover 26 1.1 1.2 Page C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Application of the theoretical method in Annex E 26 5.5.2 5.5.3 Empirical method based on European experience 26 5.6 Load cases for calculation of clearances 27 5.6.2 Maximum conductor temperature 27 5.6.3 Wind loads for determination of electric clearances 27 5.6.4 Ice loads for determination of electric clearances 28 5.6.5 Combined wind and ice loads 29 5.7 Coordination of conductor positions and electrical stresses 29 5.8 Internal clearances within the span and at the top of support 30 5.9 External clearances 33 5.9.1 General 33 5.9.2 External clearances to ground in areas remote from buildings, roads, etc 34 5.9.3 External clearances to residential and other buildings 34 5.9.4 External clearances to crossing traffic routes 36 5.9.5 External clearances to adjacent traffic routes 39 5.9.6 External clearances to other power lines or overhead telecommunication lines 39 5.10 Corona effect 41 5.10.1 Radio noise 41 5.11 Electric and magnetic fields 41 5.11.1 Electric and magnetic fields under a line 41 5.11.2 Electric and magnetic field induction 41 5.11.3 Interference with telecommunication circuits 41 Earthing systems 42 6.1 Introduction 42 6.1.2 Requirements for dimensioning of earthing systems 42 6.1.3 Earthing measures against lightning effects 42 6.1.4 Transferred potentials 43 6.2 Ratings with regard to corrosion and mechanical strength 43 6.2.1 Earth electrodes 43 6.2.2 Earthing and bonding conductors 44 6.4 Dimensioning with regard to human safety 44 6.4.1 Permissible values for touch voltages 44 6.4.3 Basic design of earthing systems with regard to permissible touch voltage 44 Supports 45 7.3 Lattice steel towers 45 7.3.6 Ultimate limit states 45 7.3.7 Serviceability limit states 45 7.3.8 Resistance of connections 45 7.3.9 Design assisted by testing 45 7.4 Steel poles 45 7.4.6 Ultimate limit states (EN 1993-1-1:2005 – Chapter 6) 45 7.4.7 Serviceability limit states (EN 1993-1-1:2005 – Chapter 7) 45 7.4.8 Resistance of connections 46 7.4.9 Design assisted by testing 46 7.5 Wood poles 46 7.5.5 Ultimate limit states 46 7.5.6 Serviceability limit states 46 7.5.7 Resistance of connections 46 7.5.8 Design assisted by testing 46 7.6 Concrete poles 46 7.6.4 Ultimate limit states 46 7.6.5 Serviceability limit states 47 Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Design assisted by testing 47 7.6.6 7.7 Guyed structures 47 7.7.4 Ultimate limit states 47 7.7.5 Serviceability limit states 47 7.9 Corrosion protection and finishes 47 7.9.1 General 47 7.10 Maintenance facilities 48 7.10.1 Climbing 48 7.10.2 Maintainability 48 7.10.3 Safety requirements 48 Foundations 48 8.1 Introduction 48 8.2 Basis of geotechnical design (EN 1997-1:2004 – Section 2) 48 8.2.2 Geotechnical design by calculation 48 8.3 Soil investigation and geotechnical data (EN 1997-1:2004 – Section 3) 48 Conductors and earth-wires 49 9.1 Introduction 49 9.2 Aluminium based conductors 49 9.2.2 Electrical requirements 49 9.2.3 Conductor service temperatures and grease characteristics 49 9.2.4 Mechanical requirements 50 9.2.5 Corrosion protection 50 9.2.6 Test requirements 50 9.3 Steel based conductors 50 9.3.1 Characteristics and dimensions 50 9.3.3 Conductor service temperatures and grease characteristics 51 9.3.4 Mechanical requirements 51 9.3.5 Corrosion protection 51 9.3.6 Test requirements 51 9.4 Copper base conductors 52 9.5 Conductors and ground wires containing optical fibre telecommunication circuits 52 9.5.1 Characteristics and dimensions 52 9.5.2 Electrical requirements 52 9.5.3 Conductor service temperatures 52 9.5.4 Mechanical requirements 52 9.6 General requirements 53 9.6.2 Partial factor for conductors 53 9.6.3 Minimum cross-sections 53 9.6.4 Sag – tension calculations 53 10 Insulators 53 10.1 Introduction 53 10.4 Pollution performance requirements 53 10.5 Power arc requirements 53 10.7 Mechanical requirements 53 10.10 Characteristics and dimensions of insulators 54 10.11 Type test requirements 54 10.11.1 Standard type tests 54 10.11.2 Optional type tests 54 11 Hardware 55 11.1 Introduction 55 11.6 Mechanical requirements 55 12 Quality assurance, checks and taking-over 56 Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Annex H/SK (informative) 56 Installation and measurements of earthing systems 56 H.2 Basis for the verification 56 H.2.2 Resistance to earth 56 H.3 Installation of earth electrodes and earthing conductors 56 H.3.1 Installation of earth conductors 56 H.4 Measurements for and on earthing systems 56 H.4.4 Determination of the earth potential rise 56 H.4.5 Reduction factor related to earth wires of overhead lines 56 Annex M/SK (informative) 57 Geotechnical and structural design of foundations 57 M.1 Typical values of the geotechnical parameters of soils and rocks 57 M.1.3 Symbols, definitions and units of some ground parameters 57 M.3 Sample semi-empirical models for resistance estimation 63 M.3.1 Geotechnical design by calculation 63 Annex S/SK (informative) 64 Map of icing zones in Slovakia 64 Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 European foreword The Slovak National Committee (NC) is identified by the following address: SLOVAK OFFICE OF STANDARDS, METROLOGY AND TESTING Štefanovičova P.O.Box 76 810 05 Bratislava 15 Slovakia email: unms@normoff.gov.sk tel: +421 252 496 847 tel: +421 252 498 030 The Slovak National Committee has prepared this Part 2-23 (EN 50341-2-23) listing the Slovak National Normative Aspects (NNA) under its sole responsibility and duly passed this document through the CENELEC and CLC/TC11 procedures NOTE The Slovak National Committee also takes sole responsibility for the technically correct coordination of this EN 50341-2-23 with EN 50341-1 It has performed the necessary checks in the frame of quality assurance/control However, it is noted that this quality assurance/control has been made in the framework of the general responsibility of The Slovak National Committee under the national laws/regulations This EN 50341-2-23 is normative in Slovakia and informative for other countries This EN 50341-2-23 has to be read in conjunction with EN 50341-1, hereinafter referred as Part All clause numbers used in Part 2-23 correspond to those of Part Specific subclauses which are prefixed SK are to be read as amendments to the relevant text in Part Any necessary clarification regarding the application of Part 2-23 in conjunction with Part shall be referred to the Slovak Office of Standards, Metrology and Testing that will, in co-operation with CLC/TC11, clarify the requirements When no reference is made in Part 2-23 to a specific subclause, then Part applies In the case of “boxed values“ defined in Part 1, amended values (if any) which are defined in Part 2-23 shall be taken into account in Slovakia However, any “boxed values” whether in Part or Part 2-23, shall not be amended in direction of greater risk in the Project Specification The national Slovak standards/regulations, regarding overhead lines exceeding kV AC, are listed in 2.1/SK.2 and 2.1/SK.3 NOTE All national standards referred to in this Part 2-23 will be replaced by the relevant European Standards as soon as they become available and are declared by the Slovak Office of Standards, Metrology and Testing to be applicable and thus reported to the secretary of CLC/TC11 Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Scope 1.1 General (ncpt) SK.1 New overhead line As a new overhead line is considered a brand new electric overhead line with nominal voltage exceeding kV AC, between the points A and B The new branch line of the existing overhead line shall be considered as a new overhead line except for a junction support for which the specific requirements shall be defined in the Project Specification The extent of application of this standard in respect of reconstruction, relaying and extension of existing overhead lines shall be determined in the Project Specification Simultaneously, the Project Specification shall determine, which of the previous national standards shall be used and to what extent they shall be used for the project in question 1.2 Field of application (ncpt) SK.1 Field of application The requirements of this standard shall be adopted, where applicable (e.g requirements on loads, external clearances, etc.), for telecommunication cables as well In case of overhead line under the design stage, parties concerned shall agree the extent of the application of this standard Overhead line under construction may be completed according to standards valid during the design stage of the line The parties concerned shall agree any possible application of certain clauses of this standard (ncpt) SK.2 Installation of telecommunication equipment on supports Provisions of this standard also apply to the telecommunication equipment and devices (aerials, dish antennas, etc.) which are installed on individual supports of overhead power lines, especially in terms of wind and ice loads on such installed equipment Design and installation has to respect requirements of the utility operating the line in question The design of such telecommunication equipment has to incorporate such technical solutions and such precautions, which shall allow safe access and maintenance of both a power line and telecommunication equipment, and which shall provide protection of persons performing repairs or maintenance of the power line and/or telecommunication equipment against electric shock and protection of telecommunication equipment and attached installations against the influence of the power line (short-circuits, switching and lightning overvoltages etc.) Normative references, definitions and symbols 2.1 Normative references (ncpt) SK.1 General National laws, Government regulations and other binding regulations are included in following 2.1/SK.2 International and national standards quoted in EN 50341-2-23 and not included in 2.1 EN 50341-1 are included in 2.1/SK.3 The set of standards included in 2.1 EN 50341-1 under a common title of Eurocodes is valid in Slovakia including the Slovak National Application documents related to relevant standards, unless EN 50341-1 and/or these Slovak National Normative Aspects (EN 503412-23) specify otherwise NOTE Some EN, IEC, ISO and CISPR publications implemented as Slovak National Standards (STN) include informative notes and informative annexes useful in Slovakia Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 (A-dev) (ncpt) SK.2 National laws, government decrees and other binding rules of law Reference Title 22/2001 Z.z Vyhláška, ktorou sa ustanovujú podrobnosti o zaradení vodných ciest a ich jednotlivých úsekov príslušných tried podľa klasifikácie európskych vodných ciest Regulation, which establishes the details on classification of waterways and their individual sections into relevant classes according to European waterway classification 534/2007 Z.z Vyhláška o podrobnostiach o požiadavkách na zdroje elektromagnetického žiarenia a na limity expozície obyvateľov elektromagnetickému žiareniu v životnom prostredí Regulation on the details on requirements on electromagnetic radiation sources and on limits of population exposure to electromagnetic radiation in the environment 251/2012 Z.z Zákon o energetike a o zmene a doplnení niektorých zákonov (energetický zákon) Act on energetics and on amendment to certain laws (Energy Act) FMPE 994/11:1981 FMD 621/1981-SM Dohoda o postupu při interferenčním ovlivnění zabezpečovacího zařízení celostátních drah zařízeními elektrizační soustavy The agreement on the common practice on interference influence of state railway security equipment by electricity system devices SK.3 Standards Reference Title STN EN 1991-1-4 Eurokód Zaťaženia konštrukcií Časť 1-4: Všeobecné zaťaženia Zaťaženie vetrom (Národná príloha NA pre SR, Mapa vetrových oblastí Eurocode 1: Action on structures Part 1-4: General actions – Wind Actions (National Annex NA for Slovakia, Wind zone map) STN 33 2040 Elektrotechnické predpisy Ochrana pred účinkami elektromagnetického poľa 50 Hz v pásme vplyvu zariadenia elektrizačnej sústavy Electric engineering regulations Protection against effects of the electromagnetic fields 50 Hz in the zone of influence of electric power system device STN 33 2160 Elektrotechnické predpisy Predpisy na ochranu oznamovacích vedení a zariadení pred nebezpečnými vplyvmi trojfázových vedení VN, VVN a ZVN Electric engineering regulations Rules for the protection of telecommunication lines and equipment against dangerous influences of three-phase high voltage, very high voltage and ultra high voltage lines Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 9.4 Copper base conductors (ncpt) SK.1 Characteristics and dimensions Requirements on dimensions and characteristics of conductors shall be determined in the Project Specification, possibly with a reference to existing national standards of other countries 9.5 Conductors and ground wires containing optical fibre telecommunication circuits 9.5.1 Characteristics and dimensions (ncpt) SK.1 Characteristics and dimensions Characteristics and dimensions of conductors with optical telecommunication fibres shall be specified in the Project Specification in relation to EN 60794-4 9.5.2 Electrical requirements (ncpt) SK.1 Conditions for the determination of maximum design temperature If a conductor with optical fibres is to be used as a phase conductor, provisions of 9.2.2/SK.1 apply 9.5.3 Conductor service temperatures (ncpt) SK.1 Maximum permissible conductor temperatures The maximum design temperature of phase conductors with optical fibres under a normal current loading shall not be higher than +80 °C The maximum conductor temperature under a short-term overload due to power system fault, shall not be higher than +200 °C The Project Specification may specify a lower temperature and/or may specify other requirements When determining maximum conductor temperature due to a specified power system fault or short-circuit, it is necessary to consider the data from conductor manufacturer For a specified maximum conductor temperature under a power system fault, any permanent degradation of optical, mechanical and electrical characteristics of conductor shall not occur When calculating conductor temperature due to a specified power system fault or short-circuit, the initial temperature of conductors is taken as +40 °C The Project Specification shall specify the values of fault currents and fault durations (as well as method of consideration of reclosing systems), which shall be considered for the thermal dimensioning of the conductor If special materials and/or conductor designs allow for a higher operational temperature, the highest allowable operational temperature shall be specified in the Project Specification This temperature may be higher than specified above in 9.5.3/SK.1 9.5.4 Mechanical requirements (ncpt) SK.1 Requirements on conductor strength Rated strength of a conductor is determined according to EN 60794-4, or is specified by a conductor manufacturer Maximum allowable tension (MAT) of a conductor according to EN 60794-4, under which no degradation of the optical characteristics of the conductor shall occur, shall not be lower than the maximum conductor tension under loads, resulting from load cases 1, 3a and according to 4.12.2/SK.1 The Project Specification may require that no tensile load of optical fibres would occur under these loads (ncpt) SK.2 Protection against effects of wind induced vibrations The Project Specification shall specify, whether and in what manner conductors are to be protected against damage due to wind induced vibrations It is recommended that the conductors with optical fibres will always be protected against vibrations by appropriate vibration dampers or other corresponding measure Simultaneously, it is necessary to take into account the recommendations of conductor manufacturer Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 9.6 General requirements 9.6.2 Partial factor for conductors (ncpt) SK.1 Partial factor for a material property for conductors The value of the partial factor for a material property for all types of conductors, related to rated tensile strength of a conductor is: γM = 1,80 9.6.3 Minimum cross-sections (ncpt+) SK.1 Minimum cross-sections of phase conductors and earth wires (A-dev) Nominal cross-section area of earth wires of lines with nominal voltage exceeding 45 kV shall not be lower than 50 mm Minimum cross-section area of phase conductors of lines with nominal voltage exceeding 45 kV shall be specified with respect to allowed limits of radio noise and allowed hygienic limits of audible noise 9.6.4 Sag – tension calculations (ncpt) SK.1 Sag – tension calculations in initial and final condition Minimum allowable electrical clearances shall not be infringed neither in the condition after installation of conductors (initial condition), nor in the condition at the end of design life of conductors (final condition), specified in the Project Specification For lines with a nominal voltage exceeding 45 kV, the designer shall therefore perform the sag – tension calculations in initial and final conductor conditions 10 Insulators 10.1 Introduction (ncpt) SK.1 Application of protective fittings for lines with nominal voltage exceeding 45 kV Insulator sets shall be equipped with protective fittings to ensure the required short-circuit resistance given in the Project Specification Each A class insulator (see EN 60383-1) in an insulator set shall be equipped with protective fittings, unless demonstrated by type tests that their use is not necessary (ncpt) SK.2 Orientation of insulator set protective fittings Orientation of insulator set protective fittings shall be specified in the Project Specification 10.4 Pollution performance requirements (ncpt) SK.1 Selection of insulators for polluted environment Site pollution severity of areas, which the line is routed through, and the requirements on the insulator choice (required test procedures with artificial pollution or required values of unified specific creepage distance) shall be determined in the Project Specification 10.5 Power arc requirements (ncpt) SK.1 Short circuit resistance Requirements on short circuit resistance of insulator sets shall be specified in the Project Specification 10.7 Mechanical requirements (ncpt) SK.1 Partial factor for a material property for insulators Partial factor for a material property is related to: − minimum mechanical (for ceramic and glass insulator units – class A) or electromechanical (for ceramic and glass insulator units – class B) failing load according to EN 60383-1, − specified mechanical load of composite insulators according to EN 61109 Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 When verifying the design resistance of insulators at the ultimate limit states the value of the partial factor for a material property γM = 1,8 shall be taken for all insulator types for lines with nominal voltage exceeding 45 kV, unless a higher value is required in the Project Specification Design forces acting on insulators resulting from conductors and insulator sets themselves in the load cases, defined in 4.12.2/SK.1 in Table 4/SK.3, shall be considered for the verification Value of the partial factor for a material property γM = 1,6 shall be considered for all insulator types for lines with nominal voltage up to 45 kV, unless a higher value is required in the Project Specification The requirement for insulator resistance under the one-sided release of a conductor tension in the loading case 5a according to 4.12.2/SK.1, Table 4/SK.3, does not apply to rigid line post insulators, where the requirements for insulator resistance against longitudinal forces shall be specified in the Project Specification (ncpt) SK.2 Minimum allowed load of insulator sets of lines with nominal voltage exceeding 45 kV To prevent potential occurrence of radio noise by spark discharges due to capacitive coupling, every sliding connection in all line insulator sets shall be subjected, under still air conditions, to tension or compression load with a minimum value of 0,5 kN (ncpt) SK.3 Multiple insulator sets In case of failing of one string of an insulator set, composed of two or more insulator strings, it shall be verified that the effect of design actions does not exceed the design resistance of remaining insulators It is assumed that maximum static forces, resulting from load cases 1, 3a and given in 4.12.2/SK.1, Table 4/SK.3, act on insulators in the remaining strings The partial factor for a material property for insulators in remaining strings is taken as for ceramic insulators γM = 1,35 for glass insulators γM = 1,1 for composite insulators γM = 1,1 unless a higher value is specified in the Project Specification 10.10 Characteristics and dimensions of insulators (ncpt) SK.1 Dimensions of pin type or stay wire insulators There are no EN or IEC standards for the dimensions of pin type or stay wire insulators and the requirements shall be specified in the Project Specification 10.11 Type test requirements 10.11.1 Standard type tests (ncpt) SK.1 Type tests of insulator sets For insulator sets for the nominal voltage exceeding 45 kV, in addition to electric tests according to EN 60383-2, the following type tests are required: − radio interference tests according to EN 60437 (parameters of the test shall be given in the Project Specification), − power arc tests on single suspension set (unless otherwise specified in the Project Specification) according to EN 61467 Parameters of the test shall be given in the Project Specification 10.11.2 Optional type tests (ncpt) SK.1 Radio interference tests and power arc tests Radio interference tests and power arc tests are considered to be the standard type tests for lines with nominal voltage exceeding 45 kV Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 (ncpt) SK.2 Other optional type tests Requirements, specifications and parameters for the performance of optional type tests shall be given in the Project Specification 11 Hardware 11.1 Introduction (ncpt) SK.1 General Double or multiple insulator sets, composed of parallel insulator strings of the long rod porcelain insulators, should be designed so that no insulator in the remaining strings would fail due to the impact of insulators or fittings of the ruptured string upon movement caused by the failure of the string 11.6 Mechanical requirements (ncpt) SK.1 Partial factor for a material property for fittings Partial factor for a material property for fittings is related to the specified minimum failing loads (SMFL) for the fittings of an insulator set, fittings of an earth wire, suspension and tension clamps and conductor in-span joints according to EN 61284 When verifying the ultimate limit states the value of the partial factor for a material property γM = 1,8 shall be taken for lines with nominal voltage exceeding 45 kV, unless a higher value is required in the Project Specification Design forces acting on fittings resulting from conductors and insulator sets in the load cases, defined in 4.12.2/SK.1 in Table 4/SK.3, shall be considered for the verification The requirement for fittings resistance under the one-sided release of conductor tension (security load - load case 5a) does not apply to rigid line post insulators, where the requirements shall be specified in the Project Specification The value of the partial factor for a material property γM = 1,6 shall be considered for all fittings for lines with nominal voltage up to 45 kV, unless a higher value is required in the Project Specification (ncpt) SK.2 Fittings of multiple insulator sets In case of failing of one string of an insulator set, composed of two or more insulator strings, it shall be verified that the effects of design actions not exceed the design resistance of remaining loaded fittings It is assumed that the maximum static forces, resulting from load cases 1, 3a and given in 4.12.2/SK.1, in Table 4/SK.3, act on insulators in the remaining strings The partial factor for a material property is taken as γM = 1,1, unless a higher value is required in the Project Specification (ncpt) SK.3 Tension clamps and conductor in-span joints The specified minimum failing load of tension clamps and conductor in-span joints according to EN 61284 is given by SMFL = X 0,95 RTS where SMFL RTS X is the specified minimum failing load which refers to the grip of the clamp/joint on the conductor, is the conductor rated tensile strength, is the factor, equal to 0,9, unless otherwise stated in the Project Specification The specified minimum failing load of conductor in-span joints for lines with nominal voltage up to 45 kV shall be specified in the Project Specification Tensile tests shall be performed according to EN 61284 More detailed requirements can be stated in the Project Specification Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 12 Quality assurance, checks and taking-over (ncpt) SK.1 Requirements for quality assurance, checks and taking-over The relevant requirements shall be specified in the Project Specification Annex H/SK (informative) Installation and measurements of earthing systems H.2 Basis for the verification H.2.2 Resistance to earth (ncpt) SK.1 Calculation of resistance to earth Formulae for calculating the resistance to earth of strip horizontal earth electrodes, earthing rods and mesh earth electrodes are given in H.2 For the determination of total resistance to earth of a support, it is possible to take into account the combination of resistance to earth of foundations and purpose-made earthing When applying earthing systems composed of more individual earth electrodes of the same or different types, it is necessary to take into account the use factor of earth electrodes Details for calculating the resistance to earth of earthing systems shall be specified in the Project Specification H.3 Installation of earth electrodes and earthing conductors H.3.1 Installation of earth conductors H.3.1.4 Jointing the earth conductors (ncpt) SK.1 Placement of copper and steel earth electrodes Copper earth electrodes shall not be placed within a clearance of m from steel earth electrodes and shall not be connected to them either H.4 Measurements for and on earthing systems H.4.4 Determination of the earth potential rise (ncpt) SK.1 Probability factor w Factor w is introduced for calculation of earth potential rise Value of w = 0,7 is taken, unless a lower value is demonstrated by a calculation Current to earth during a fault is then given by a formula IE = r ⋅ 3I0 ⋅ w where r is reduction factor of earth wires, 3I0 is the sum of zero sequence currents during fault, w probability (or simultaneity) factor, for example according to STN 33 2160 H.4.5 Reduction factor related to earth wires of overhead lines H.4.5.2 Values of reduction factor of overhead lines (ncpt) SK.1 Values of reduction factor of overhead lines Values of reduction factors of earth wires of the most widely used types of lines with rated voltages of 110 kV, 220 kV and 400 kV are given in STN 33 2160 This standard applies to calculations of dangerous influences of overhead and cable lines of high voltage, very high voltage and ultra high voltage on telecommunication lines and equipment, their protection against these influences and for the calculations of dangerous influences and for determination of protection measures of telecommunication equipment and lines entering the power stations of high, very high and ultra high voltage For a particular line, the corresponding value of the reduction factor of earth wires may be determined by calculation Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Annex M/SK (informative) Geotechnical and structural design of foundations M.1 Typical values of the geotechnical parameters of soils and rocks M.1.1 General (ncpt) SK.1 Typical values of the geotechnical parameters of soils and rocks In Slovakia it is possible to consider the values given in the following tables M/SK.1 to M/SK.5 in the calculations The definitions of symbols used in tables are listed in M.1.3 and completed in the following M.1.3/SK.1 For Table M/SK.5 the definitions given under the table apply M.1.3 Symbols, definitions and units of some ground parameters (ncpt) SK.1 Symbols, definitions and units of some ground parameters Soils Edef Modulus of deformation MN/m φu Total angle of internal friction degrees Rdt Design pressure resistance kN/m Poisson coefficient - Rocks µ Stt.010.Mssv.BKD002ac.email.ninhd.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj.dtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn.Stt.010.Mssv.BKD002ac.email.ninhddtt@edu.gmail.com.vn.bkc19134.hmu.edu.vn C.vT.Bg.Jy.Lj.Tai lieu Luan vT.Bg.Jy.Lj van Luan an.vT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.LjvT.Bg.Jy.Lj Do an.Tai lieu Luan van Luan an Do an.Tai lieu Luan van Luan an Do an BS EN 50341-2-23:2016 EN 50341-2-23:2016 Table M/SK.1 – Characteristic values of fine-grained soils properties (design value is given for Rdt) Workability STN 73 6133 / STN 73 3050 STN 73 1001/STN EN ISO 14688-1,2 Soil Class Consistency Boring Class STN ability / STN EN ISO Compactness class 73 146881001 1,2 Edef γ cu -3 kN.m MN/m kN/m Gravelly loam Gravelly clay F1 MG grSi grCl saSi saCl Medium and low F5 saclSi plasticity Ml/MI loam Medium and low F6 plasticity Cl/CI clay sasiCl kN/m Rdt ° kN/m + 19,0 19,0