1、BSI Standards PublicationOverhead electrical lines exceeding AC 1 kV Part -2-7: National Normative Aspects (NNA) for FINLAND (based on EN 50341-1:2012)BS EN 50341-2-7:2015National forewordThis British Standard is the UK implementation of EN 50341-2-7:2015.This standard, together with the following l
2、ist of National Normative Aspectstandards, supersedes BS EN 50423-3:2005 and BS EN 50341-3:2001:BS EN 50423-3:2005 and BS EN 50341-3:2001 will be withdrawn upon publication of the rest of the series.The UK participation in its preparation was entrusted to Technical CommitteePEL/11, Overhead Lines.A
3、list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards
4、Limited 2015ISBN 978 0 580 92258 9ICS 29.240.20Compliance with a British Standard cannot confer immunity from legalobligations.This British Standard was published under the authority of the Standards Policyand Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate
5、Text affectedBRITISH STANDARDBS EN 50341-2-7:2015Country Code Origin Ref AT Austrian National Committee BS EN 50341-2-1 BE Belgian National Committee BS EN 50341-2-2 CH Swiss National Committee BS EN 50341-2-3 DE German National Committee BS EN 50341-2-4 DK Danish National Committee BS EN 50341-2-5
6、ES Spanish National Committee BS EN 50341-2-6 FI Finnish National Committee BS EN 50341-2-7:2015FR French National Committee BS EN 50341-2-8 GB British National Committee BS EN 50341-2-9:2015 GR Greek National Committee BS EN 50341-2-10 IE Irish National Committee BS EN 50341-2-11 IS Iceland Nationa
7、l Committee BS EN 50341-2-12 IT Italian National Committee BS EN 50341-2-13 LU Luxemburg National Committee No NNA available NL Nederlands National Committee BS EN 50341-2-15 NO Norwegian National Committee BS EN 50341-2-16 PT Portuguese National Committee BS EN 50341-2-17 SE Swedish National Commit
8、tee BS EN 50341-2-18 CZ Czech National Committee BS EN 50341-2-19:2015EE Estonian National Committee BS EN 50341-2-20:2015 SI Slovak National Committee BS EN 50341-2-21 PL Polish National Committee BS EN 50341-2-22 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 50341-2-7 September 2015 ICS 29.
9、240.20 English Version Overhead electrical lines exceeding AC 1 kV - Part -2-7: National Normative Aspects (NNA) for FINLAND (based on EN 50341-1:2012) This European Standard was approved by CENELEC on 2015-08-11. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulg
10、aria, 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, Switzer
11、land, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in an
12、y form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 50341-2-7:2015 E BS EN 50341-2-7:2015EN 50341-2-7:2015 - 2/27 - FinlandContents Page Foreword . 4 1 Scope . 5 1.1 General . 5 1.2 Field of application . 5 2 Normative references, definitions and symbols . 5 2.1 Normative ref
13、erences . 5 3 Basis of design 6 3.2 Requirements of overhead lines . 6 3.2.2 Reliability requirements . 6 3.2.5 Strength coordination 6 4 Actions on lines . 7 4.3 Wind loads . 7 4.3.1 Field of application and basic wind velocity 7 4.3.2 Mean wind velocity . 7 4.3.3 Mean wind pressure . 8 4.4 Wind fo
14、rces on overhead line components . 8 4.4.1 Wind forces on conductors . 8 4.4.1.1 General . 8 4.4.1.2 Structural factor 8 4.4.1.3 Drag factor . 8 4.4.2 Wind forces on insulator sets 8 4.4.3 Wind forces on lattice towers 9 4.4.3.1 General . 9 4.4.3.2 Method 1 9 4.4.4 Wind forces on poles . 9 4.5 Ice l
15、oads . 9 4.5.1 General . 9 4.6 Combined wind and ice loads . 9 4.6.2 Drag factors and ice densities . 9 4.7 Temperature effects 9 4.8 Security loads 10 4.9 Safety loads . 10 4.9.1 Construction and maintenance loads 10 4.12 Load cases . 11 4.12.1 General . 11 4.12.2 Standard load cases . 11 4.13 Part
16、ial factors for actions . 13 5 Electrical requirements . 14 5.4 Classification of voltages and overvoltages 14 5.4.1 General . 14 5.6 Load cases for calculation of clearances . 14 5.6.1 Load conditions 14 5.6.2 Maximum conductor temperature . 15 5.6.3 Ice loads for determination of electric clearanc
17、es 15 5.8 Internal clearances within the span and at the top of support 15 5.9 External clearances 15 5.9.1 General . 15 5.9.2 External clearances to ground in areas remote from buildings, roads etc. 15 5.9.3 External clearances to residential and other buildings 16 5.9.4 External clearances to cros
18、sing traffic routes . 16 5.9.6 External clearances to other power lines or telecommunication lines . 17 6 Earthing systems 19 6.1 Introduction . 19 6.1.4 Transferred potentials 19 6.4 Dimensioning with regard to human safety . 19 6.4.3 Design of earthing systems with regard to permissible touch volt
19、age 19 BS EN 50341-2-7:2015Finland - 3/27 - EN 50341-2-7:2015 7 Supports 19 7.3 Lattice steel towers . 19 7.3.1 General . 19 7.3.6 Ultimate limit states 19 7.3.6.1 General 19 7.5 Wood poles 20 7.5.3 Materials 20 7.5.5 Ultimate limit states 20 7.5.5.1 Basis. 20 7.5.5.2 Calculation of internal forces
20、and moments 20 7.5.5.3 Resistance of wood elements . 20 7.5.5.4 Decay conditions 20 7.7 Guyed structures 21 7.7.4 Ultimate limit states 21 7.7.4.1 Basis. 21 7.7.4.3 Second order analysis 21 7.7.6 Design details for guys 21 7.10 Maintenance facilities . 22 7.10.3 Safety requirements . 22 8 Foundation
21、s . 22 8.1 Introduction . 22 8.2 Basis of geotechnical design 23 8.2.1 General . 23 8.2.2 Geotechnical design by calculation 23 8.2.3 Design by prescriptive measures . 24 9 Conductors and earth wires . 25 9.1 Introduction . 25 9.6 General requirements . 26 9.6.2 Partial factor for conductors 26 10 I
22、nsulators . 26 10.2 Standard electrical requirements . 26 10.11 Type test requirements . 26 11 Hardware 27 11.6 Mechanical requirements 27 11.8 Material selection and specification 27 12 Quality assurance, checks and taking over 27 BS EN 50341-2-7:2015EN 50341-2-7:2015 - 4/27 - Finland Foreword 1 Th
23、e Finnish National Committee (NC) is identified by the following address: SESKO Standardization in Finland Standardization committee SK11, High Voltage Overhead Lines Addr. P.O. Box 134, 00211 Helsinki, Finland Tel. +358-9-696391 Fax. +358-9-677059 Email palautesesko.fi 2 The Finnish NC has prepared
24、 this Part 2-7 of EN 50341 listing the Finnish national normative aspects (NNA), under its sole responsibility, and duly passed it through the CENELEC and CLC/TC 11 procedures. NOTE: The Finnish NC also takes sole responsibility for the technically correct co-ordination of this NNA with EN 50341-1.
25、It has performed the necessary checks in the frame of quality assurance/control. However, it is noted that this quality control has been made in the framework of the general responsibility of a standards committee under the national laws/regulations. 3 This NNA is normative in Finland and informativ
26、e for other countries. 4 This NNA has to be read in conjunction with Part 1 (EN 50341-1). All clause numbers used in this NNA correspond to those of Part 1. Specific sub-clauses, which are prefixed “FI“, are to be read as amendments to the relevant text in Part 1. Any necessary clarification regardi
27、ng the application of this combined NNA in conjunction with Part 1 shall be referred to the Finnish NC who will, in co-operation with CLC/TC 11, clarify the requirements. When no reference is made in this NNA to a specific sub-clause, then Part 1 applies. 5 In the case of “boxed values“ defined in P
28、art 1, amended values (if any), which are defined in this NNA, shall be taken into account in Finland. However, any boxed value, whether in Part 1 or in this NNA, shall not be amended in the direction of greater risk in a Project Specification. 6 The national Finnish standards/regulations related to
29、 overhead electrical lines exceeding 1 kV AC are listed in 2.1/FI.1-2. NOTE: All national standards referred to in this NNA will be replaced by the relevant European Standards as soon as they become available and are declared by the Finnish NC to be applicable and thus reported to the secretary of C
30、LC/TC 11. BS EN 50341-2-7:2015Finland - 5/27 - EN 50341-2-7:2015 1 Scope 1.1 General (ncpt) FI.1 Application of the standard in Finland In Finland the standard EN 50341-1 (Part 1) can only be applied using this NNA (EN 50341-2-7) containing National Normative Aspects for Finland. The requirements of
31、 the standard are applied also for low voltage (below 1 kV AC) overhead lines. The requirements of the structural design are applicable also for DC overhead lines, where the electrical requirements are given in the Project Specification. This standard is applicable for new overhead lines only. (ncpt
32、) FI.2 Application for existing overhead lines Overhead lines complying with the mechanical and electrical requirements of its original date of construction can be operated and maintained, if they do not cause obvious danger. The reparation and overhaul of lines can be done according to the previous
33、 requirements. Reparation means that a component which has been damaged is substituted with a similar new one. Overhaul means a wider improvement of the line for extending its lifetime. The basic structure remains same as before. This standard should be used for all modification works on existing li
34、nes. In modification works earlier norms and standards may also be used. In that case it shall especially be verified that changes in actions do not have significant impact on the loads of lines. Modification work means e.g. relocation of some supports or an extension to a line when this supplement
35、has been taken into account in the original design, e.g. addition of a circuit or changing of the conductors to existing supports. 1.2 Field of application (ncpt) FI.1 Application to covered conductors and aerial cables The standard includes requirements for the design and construction of overhead l
36、ines equipped with covered conductors and aerial cables. Additionally, the requirements of the equipment standards and manufacturers instructions shall be followed. (ncpt) FI.2 Application to cables for telecommunication The standard includes requirements for the application of telecommunication cab
37、les installed on common supports with electrical lines. (ncpt) FI.3 Installation of other equipment Only equipment belonging to the line (electric or telecommunication line) can be installed on the overhead lines. However, equipment serving communal services or environmental protection like telecomm
38、unication equipment, road signs, warning signs or warning balls may also be installed with the permission of the owner of the line. Other equipment than those mentioned above can also be installed on supports equipped with aerial cables with the permission of the owner of the line. If other equipmen
39、t is installed on the supports, the requirements of safe working practices shall be taken into account. The installation height of equipment meant to be installed and maintained by an ordinary person shall be such that the work can be done without climbing the support and the distances of safe elect
40、rical work can be followed (see standard SFS 6002). The additional loads due to other equipment on the line supports shall be taken into account. 2 Normative references, definitions and symbols 2.1 Normative references (A-dev) FI.1 National normative laws, government regulations Shkturvallisuuslaki
41、(410/1996) Electrical Safety Act Shkturvallisuusasetus (498/1996) Electrical Safety Decree Kauppa- ja teollisuusministerin pts shklaitteistojen turvallisuudesta (1193/1999) Decision of Ministry of Trade and Industry on Safety of electrical installations Viestintviraston mrys M 43 tietoliikenneverkon
42、 shkisest suojaamisesta BS EN 50341-2-7:2015EN 50341-2-7:2015 - 6/27 - Finland Decree nr M 43 of the Finnish Communications Regulatory Authority on the electrical protection of a telecommunication network Liikenteen turvallisuusviraston mrys AGA M3-6, Lentoesterajoitukset ja lentoesteiden merkitsemi
43、nen. Aviation regulation AGA M3-6 of the Finnish Transport Safety Agency on the Aviation obstacle limitations and marking of objects. Liikenneviraston ohje 23/2014 Ilmajohtojen sek kaapeleiden ja putkijohtojen asettaminen ja merkitseminen vesialueella. Publication 23/2014 of the Finnish Transport Ag
44、ency: Installation and marking of overhead lines, cables and pipelines in waterways. (ncpt) FI.2 National normative standards SFS 2662 Ilmajohtotarvikkeet. Puupylvs Overhead line materials. Wood pole SFS 5717 Maakaasun siirtoputkiston sijoittaminen suurjnnitejohdon tai kytkinlaitoksen lheisyyteen Pl
45、acing of the natural gas transmission pipeline close to a high-voltage line or substation SFS 6000 Pienjnniteshkasennukset Low voltage electrical installations SFS 6001 Suurjnniteshkasennukset High voltage electrical installations SFS 6002 Shktyturvallisuus (perustuu standardiin EN 50110-1/2) Safety
46、 at electrical work (based on standard EN 50110-1/2) RIL 202/by 61 Betonirakenteiden suunnitteluohje (perustuu standardiin SFS-EN 1992-1-1) Design guide for concrete structures (based on standard SFS-EN 1992-1-1) RIL 207 Geotekninen suunnittelu (perustuu standardiin SFS-EN 1997-1) Geotechnical desig
47、n (based on standard SFS-EN 1997-1) RIL 254 Paalutusohje Piling instructions 3 Basis of design 3.2 Requirements of overhead lines 3.2.2 Reliability requirements (ncpt) FI.1 Selection of reliability levels The minimum reliability levels based on the nominal voltage and importance of the lines are def
48、ined in Table 3.1/FI.1 below. The level shall be given in the Project Specification. Table 3.1/FI.1 - Reliability levels of overhead lines in Finland Level Nominal voltage Type of line 1 Un AC 45 kV Normal lines Un AC 45 kV Temporary or unimportant lines 2 Un AC 45 kV Special lines Un AC 45 kV Norma
49、l lines 3 all Very important lines, i.e. all 400 kV lines 3.2.5 Strength coordination (ncpt) FI.1 Angle and tension supports The partial factors Mfor the resistance of the structural elements of angle (angle 10 degrees), tension and terminal supports shall be multiplied by an additional factor S= 1,1. This requirement needs not to be applied at construction load cases. In these cases, when determining the structural design resistance Rdin the basic design formula Ed45 kV, if n
