BS EN 62305-1-2011 Protection against lightning General principles《雷电防护 通则》.pdf

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1、Protection against lightningPart 1: General principlesBS EN 62305-1:2011BS EN 62305-1:2011Incorporating corrigendum November 2016(IEC 62305-1:2010)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS EN 62305-1:2011 BRITISH STANDARDNational forewordThis British Standar

2、d is the UK implementation of EN 62305-1:2011, incorporating corrigendum November 2016. It is identical to IEC 62305-1:2010. It supersedes BS EN 62305-1:2006, which is withdrawn.Parts 1, 3 and 4 of EN 62305 contain references to EN 62305-2:2011. This reference is incorrect since Part 2 is not due to

3、 be published until 2012 to allow for the finalization of the CENELEC common modifications.Until EN 62305-2:2012 is published and adopted as BS EN 62305-2:2012, the existing BS EN 62305-2:2006 can continue to be used with the newly published BS EN 62305-1:2011, BS EN 62305-3:2011 and BS EN 62305-4:2

4、011.The UK participation in its preparation was entrusted to Technical Committee GEL/81, Protection against lightning.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 contr

5、act. Users are responsible for its correct application. The British Standards Institution 2017. Published by BSI Standards Limited 2017ISBN 978 0 580 96706 1ICS 29.020; 91.120.40Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under

6、 the authority of the Standards Policy and Strategy Committee on 30 June 2011.Amendments/corrigenda issued since publicationDate Text affected28 February 2017 Implementation of CENELEC corrigendum November 2016: modified removed from titles on EN title pageEUROPEAN STANDARD EN 62305-1 NORME EUROPENN

7、E EUROPISCHE NORM February 2011 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue Marnix 17, B - 1000 Brussels 2011 CENELEC - All rights of exploitation in any for

8、m and by any means reserved worldwide for CENELEC members. Ref. No. EN 62305-1:2011 E ICS 29.020; 91.120.40 Supersedes EN 62305-1:2006 + corr. Nov.2006English version Protection against lightning - Part 1: General principles (IEC 62305-1:2010, modified) Protection contre la foudre - Partie 1: Princi

9、pes gnraux (CEI 62305-1:2010, modifie) Blitzschutz -Teil 1: Allgemeine Grundstze (IEC 62305-1:2010, modifiziert) This European Standard was approved by CENELEC on 2011-01-13. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

10、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 Central Secretariat or to any CENELEC member. This European Standard exists in three official versions

11、(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 Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Aust

12、ria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United K

13、ingdom. (IEC 62305-1:2010) )EN 62305-1:2011 - 2 - Foreword The text of document 81/370/FDIS, future edition 2 of IEC 62305-1, prepared by IEC TC 81, Lightning protection, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62305-1 on 2011-01-13. This European Standard su

14、persedes EN 62305-1:2006 + corr. Nov.2006. This EN 62305-1:2011 includes the following significant technical changes with respect to EN 62305-1:2006 + corr. Nov.2006: 1) It no longer covers protection of services connected to structures. 2) Isolated interfaces are introduced as protection measures t

15、o reduce failure of electric and electronic systems. 3) First negative impulse current is introduced as a new lightning parameter for calculation purposes. 4) Expected surge overcurrents due to lightning flashes have been more accurately specified for low voltage power systems and for telecommunicat

16、ion systems. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent rights. The following dates were fixed: latest date by which the EN has to be implem

17、ented at national level by publication of an identical national standard or by endorsement (dop) 2011-10-13 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2014-01-13 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International

18、 Standard IEC 62305-1:2010 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: 1 IEC 60664-1:2007 NOTE Harmonized as EN 60664-1:2007 (not modified). 2 IEC 61000-4-5 NOTE

19、Harmonized as EN 61000-4-5. 7 IEC 61643-1 NOTE Harmonized as EN 61643-11. 8 IEC 61643-21 NOTE Harmonized as EN 61643-21. _ BS EN 62305-1:2011- 3 - EN 62305-1:2011 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following refe

20、renced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common

21、modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 62305-2 2010 Protection against lightning - Part 2: Risk management EN 62305-2 2011 IEC 62305-3 2010 Protection against lightning - Part 3: Physical damage to structures and life hazard EN 62305-3 20

22、11 IEC 62305-4 2010 Protection against lightning - Part 4: Electrical and electronic systems within structures EN 62305-4 2011 BS EN 62305-1:2011 2 62305-1 IEC:2010(E) CONTENTS FOREWORD . 5 INTRODUCTION 7 1 Scope . 8 2 Normative references . 8 3 Terms and definitions . 8 4 Lightning current paramete

23、rs 14 5 Damage due to lightning . 14 5.1 Damage to a structure 14 5.1.1 Effects of lightning on a structure 14 5.1.2 Sources and types of damage to a structure . 16 5.2 Types of loss . 16 6 Need and economic justification for lightning protection 18 6.1 Need for lightning protection 18 6.2 Economic

24、justification of lightning protection . 19 7 Protection measures. 19 7.1 General 19 7.2 Protection measures to reduce injury of living beings by electric shock . 19 7.3 Protection measures to reduce physical damage 20 7.4 Protection measures to reduce failure of electrical and electronic systems 20

25、7.5 Protection measures selection 20 8 Basic criteria for protection of structures 21 8.1 General 21 8.2 Lightning protection levels (LPL) 21 8.3 Lightning protection zones (LPZ) 23 8.4 Protection of structures 25 8.4.1 Protection to reduce physical damage and life hazard . 25 8.4.2 Protection to re

26、duce the failure of internal systems . 26 Annex A (informative) Parameters of lightning current . 27 Annex B (informative) Time functions of the lightning current for analysis purposes 38 Annex C (informative) Simulation of the lightning current for test purposes . 44 Annex D (informative) Test para

27、meters simulating the effects of lightning on LPS components . 48 Annex E (informative) Surges due to lightning at different installation points . 62 Bibliography 67 Figure 1 Connection between the various parts of IEC 62305 . 7 Figure 2 Types of loss and corresponding risks resulting from different

28、 types of damage . 18 Figure 3 LPZ defined by an LPS (IEC 62305-3) . 24 Figure 4 LPZ defined by an SPM (IEC 62305-4) 25 Figure A.1 Definitions of impulse current parameters (typically T2RTIn this case, protection measures shall be adopted in order reduce the risk R (R1 to R3) to the tolerable level

29、RT R # RTBS EN 62305-1:2011BS EN 62305-1:201162305-1 IEC:2010(E) 18 62305-1 IEC:2010(E) 19 If more than one type of loss could appear, the condition R # RTshall be satisfied for each type of loss (L1, L2 and L3). The values of tolerable risk RTwhere lightning could result in the loss of items of soc

30、ial value should be under the responsibility of a competent national body. NOTE 2 An authority having jurisdiction may specify the need for lightning protection for specific applications without requiring a risk assessment. In these cases, the required lightning protection level will be specified by

31、 the authority having jurisdiction. In some cases, a risk assessment may be performed as a technique by which to justify a waiver to these requirements. NOTE 3 Detailed information on risk assessment and on the procedure for selection of protection measures is reported in IEC 62305-2. 6.2 Economic j

32、ustification of lightning protection Besides the need for lightning protection for the structure to be protected, it may be useful to evaluate the economic benefits of providing protection measures in order to reduce the economic loss L4. In this case, the risk R4 of loss of economic values should b

33、e assessed. The assessment of risk R4 allows for the evaluation of the cost of the economic loss with and without the adopted protection measures. Lightning protection is cost effective if the sum of the cost CRLof residual loss in the presence of protection measures and the cost CPMof protection me

34、asures is lower than the cost CLof total loss without protection measures: CRL+ CPM CLNOTE Detailed information on the evaluation of economic justification of lightning protection is reported in IEC 62305-2. 7 Protection measures 7.1 General Protection measures may be adopted in order to reduce the

35、risk according to the type of damage. 7.2 Protection measures to reduce injury of living beings by electric shock Possible protection measures include: adequate insulation of exposed conductive parts; equipotentialization by means of a meshed earthing system; “ physical restrictions and warning noti

36、ces; “ lightning equipotential bonding (EB). NOTE 1 Equipotentialization and an increase of the contact resistance of the ground surface inside and outside the structure may reduce the life hazard (see Clause 8 of IEC 62305-3:2010). NOTE 2 Protection measures are effective only in structures protect

37、ed by an LPS. NOTE 3 The use of storm detectors and the associated provision taken may reduce the life hazard. BS EN 62305-1:2011BS EN 62305-1:201162305-1 IEC:2010(E) 19 20 62305-1 IEC:2010(E) 7.3 Protection measures to reduce physical damage Protection is achieved by the lightning protection system

38、 (LPS) which includes the following features: air-termination system; down-conductor system; earth-termination system; lightning equipotential bonding (EB); electrical insulation (and hence separation distance) against the external LPS. NOTE 1 When an LPS is installed, equipotentialization is a very

39、 important measure to reduce fire and explosion danger and life hazard. For more details see IEC 62305-3. NOTE 2 Provisions limiting the development and propagation of the fire such as fireproof compartments, extinguishers, hydrants, fire alarms and fire extinguishing installations may reduce physic

40、al damage. NOTE 3 Protected escape routes provide protection for personnel. 7.4 Protection measures to reduce failure of electrical and electronic systems Possible protection measures (SPM) include $ earthing and bonding measures, $ magnetic shielding, $ line routing, $ isolating interfaces, $ coord

41、inated SPD system. These measures may be used alone or in combination. NOTE 1 When source of damage S1 is considered, protection measures are effective only in structures protected by an LPS. NOTE 2 The use of storm detectors and the associated provision taken may reduce failures of electrical and e

42、lectronic systems. 7.5 Protection measures selection The protection measures listed in 7.2, 7.3 and 7.4 together form the overall lightning protection. Selection of the most suitable protection measures shall be made by the designer of the protection measures and the owner of the structure to be pro

43、tected according to the type and the amount of each kind of damage, the technical and economic aspects of the different protection measures and the results of risk assessment. The criteria for risk assessment and for selection of the most suitable protection measures are given in IEC 62305-2. Protec

44、tion measures are effective provided that they comply with the requirements of relevant standards and are able to withstand the stress expected in the place of their installation. BS EN 62305-1:2011BS EN 62305-1:201162305-1 IEC:2010(E) 20 62305-1 IEC:2010(E) 21 8 Basic criteria for protection of str

45、uctures 8.1 General An ideal protection for structures would be to enclose the structure to be protected within an earthed and perfectly conducting continuous shield of adequate thickness, and to provide adequate bonding, at the entrance point into the shield, of the lines connected to the structure

46、. This would prevent the penetration of lightning current and related electromagnetic field into the structure to be protected and prevent dangerous thermal and electrodynamic effects of current, as well as dangerous sparkings and overvoltages for internal systems. In practice, it is often neither p

47、ossible nor cost effective to go to such measures to provide such full protection. Lack of continuity of the shield and/or its inadequate thickness allows the lightning current to penetrate the shield causing: physical damage and life hazard; failure of internal systems. Protection measures, adopted

48、 to reduce such damages and relevant consequential loss, shall be designed for the defined set of lightning current parameters against which protection is required (lightning protection level). 8.2 Lightning protection levels (LPL) For the purposes of IEC 62305, four lightning protection levels (I t

49、o IV) are introduced. For each LPL, a set of maximum and minimum lightning current parameters is fixed. NOTE 1 Protection against lightning whose maximum and minimum lightning current parameters exceed those relevant to LPL I needs more efficient measures which should be selected and erected on an individual basis. NOTE 2 The probability of occurrence of lightning with minimum or maximum current parameters outside the range of values defined for LPL I is less than 2 %. The maximum