1、 IEC 62305-4 Edition 2.0 2010-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Protection against lightning Part 4: Electrical and electronic systems within structures Protection contre la foudre Partie 4: Rseaux de puissance et de communication dans les structures IEC62305-4:2010 THIS PUBLICATION IS
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16、Protection against lightning Part 4: Electrical and electronic systems within structures Protection contre la foudre Partie 4: Rseaux de puissance et de communication dans les structures INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XC ICS 29.020; 91.120.40 PRI
17、CE CODE CODE PRIX ISBN 978-2-83220-130-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous
18、 avez obtenu cette publication via un distributeur agr. 2 62305-4 IEC:2010 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope . 9 2 Normative references . 9 3 Terms and definitions . 10 4 Design and installation of SPM . 13 4.1 General . 13 4.2 Design of SPM 16 4.3 Lightning protection zones (LPZ) . 17
19、4.4 Basic SPM 20 5 Earthing and bonding . 21 5.1 General . 21 5.2 Earth-termination system . 22 5.3 Bonding network 24 5.4 Bonding bars . 28 5.5 Bonding at the boundary of an LPZ . 29 5.6 Material and dimensions of bonding components . 29 6 Magnetic shielding and line routing . 30 6.1 General . 30 6
20、.2 Spatial shielding 30 6.3 Shielding of internal lines 30 6.4 Routing of internal lines . 30 6.5 Shielding of external lines . 31 6.6 Material and dimensions of magnetic shields . 31 7 Coordinated SPD system 31 8 Isolating interfaces . 32 9 SPM management 32 9.1 General . 32 9.2 SPM management plan
21、 . 32 9.3 Inspection of SPM . 33 9.3.1 General . 33 9.3.2 Inspection procedure . 34 9.3.3 Inspection documentation 34 9.4 Maintenance 35 Annex A (informative) Basis of electromagnetic environment evaluation in an LPZ 36 Annex B (informative) Implementation of SPM for an existing structure 60 Annex C
22、 (informative) Selection and installation of a coordinated SPD system 76 Annex D (informative) Factors to be considered in the selection of SPDs . 82 Bibliography 87 Figure 1 General principle for the division into different LPZ 13 Figure 2 Examples of possible SPM (LEMP protection measures) 15 Figu
23、re 3 Examples for interconnected LPZ . 19 Figure 4 Examples for extended lightning protection zones 20 62305-4 IEC:2010 3 Figure 5 Example of a three-dimensional earthing system consisting of the bonding network interconnected with the earth-termination system 22 Figure 6 Meshed earth-termination sy
24、stem of a plant . 23 Figure 7 Utilization of reinforcing rods of a structure for equipotential bonding . 25 Figure 8 Equipotential bonding in a structure with steel reinforcement . 26 Figure 9 Integration of conductive parts of internal systems into the bonding network 27 Figure 10 Combinations of i
25、ntegration methods of conductive parts of internal systems into the bonding network . 28 Figure A.1 LEMP situation due to lightning strike . 37 Figure A.2 Simulation of the rise of magnetic field by damped oscillations . 40 Figure A.3 Large volume shield built by metal reinforcement and metal frames
26、 41 Figure A.4 Volume for electrical and electronic systems inside an inner LPZ n . 42 Figure A.5 Reducing induction effects by line routing and shielding measures . 43 Figure A.6 Example of SPM for an office building . 45 Figure A.7 Evaluation of the magnetic field values in case of a direct lightn
27、ing strike . 46 Figure A.8 Evaluation of the magnetic field values in case of a nearby lightning strike . 48 Figure A.9 Distance sadepending on rolling sphere radius and structure dimensions 51 Figure A.10 Types of grid-like large volume shields . 52 Figure A.11 Magnetic field strengthH1/MAXinside a
28、 grid-like shield type 1 . 53 Figure A.12 Magnetic field strengthH1/MAXinside a grid-like shield type 1 according to mesh width . 54 Figure A.13 Low-level test to evaluate the magnetic field inside a shielded structure . 55 Figure A.14 Voltages and currents induced into a loop formed by lines 56 Fig
29、ure B.1 SPM design steps for an existing structure . 63 Figure B.2 Possibilities to establish LPZ in existing structures . 67 Figure B.3 Reduction of loop area using shielded cables close to a metal plate . 69 Figure B.4 Example of a metal plate for additional shielding 70 Figure B.5 Protection of a
30、erials and other external equipment . 71 Figure B.6 Inherent shielding provided by bonded ladders and pipes . 72 Figure B.7 Ideal positions for lines on a mast (cross-section of steel lattice mast) 72 Figure B.8 Upgrading of the SPM in existing structures 74 Figure C.1 Surge voltage between live con
31、ductor and bonding bar 79 Figure D.1 Installation example of test class I, class II and class III SPDs . 83 Figure D.2 Basic example for different sources of damage to a structure and lightning current distribution within a system . 84 Figure D.3 Basic example of balanced current distribution . 85 T
32、able 1 Minimum cross-sections for bonding components 30 Table 2 SPM management plan for new buildings and for extensive changes in construction or use of buildings 33 Table A.1 Parameters relevant to source of harm and equipment . 38 Table A.2 Examples for I0MAX = 100 kA and wm= 2 m . 48 Table A.3 M
33、agnetic attenuation of grid-like spatial shields for a plane wave . 49 Table A.4 Rolling sphere radius corresponding to maximum lightning current 51 4 62305-4 IEC:2010 Table A.5 Examples for I0/MAX= 100 kA and wm= 2 m corresponding to SF = 12,6 dB . 51 Table B.1 Structural characteristics and surrou
34、ndings 60 Table B.2 Installation characteristics 61 Table B.3 Equipment characteristics 61 Table B.4 Other questions to be considered for the protection concept 61 Table D.1 Preferred values of Iimp. 82 62305-4 IEC:2010 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ PROTECTION AGAINST LIGHTNING Part
35、4: Electrical and electronic systems within structures FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-opera
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45、this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62305-4 has been prepared by IEC technical com
46、mittee 81: Lightning protection. This second edition cancels and replaces the first edition, published in 2006, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: 1) Isolating interfaces capable of reducing co
47、nducted surges on lines entering the structure are introduced. 2) Minimum cross-sections for bonding components are slightly modified. 3) First negative impulse current is introduced for calculation purposes as electromagnetic source of harm to the internal systems. 4) Selection of SPD with regard t
48、o voltage protection level is improved to take into account oscillation and induction phenomena in the circuit downstream of SPD. 5) Annex C dealing with SPD coordination is withdrawn and referred back to SC 37A. 6 62305-4 IEC:2010 6) A new informative Annex D is introduced giving information on fac
49、tors to be considered in the selection of SPDs. This bilingual version (2012-06) corresponds to the monolingual English version, published in 2010-12. The text of this standard is based on the following documents: FDIS Report on voting 81/373/FDIS 81/383/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in th
