1、 IEC 62305-3 Edition 2.0 2010-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Protection against lightning Part 3: Physical damage to structures and life hazard Protection contre la foudre Partie 3: Dommages physiques sur les structures et risques humains IEC62305-3:2010 colourinsideTHIS PUBLICATION
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16、LE Protection against lightning Part 3: Physical damage to structures and life hazard Protection contre la foudre Partie 3: Dommages physiques sur les structures et risques humains INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XG ICS 29.020; 91.120.40 PRICE COD
17、E CODE PRIX ISBN 978-2-83220-129-9 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 avez
18、obtenu cette publication via un distributeur agr. colourinside 2 62305-3 IEC:2010 CONTENTS FOREWORD . 7 INTRODUCTION . 10 1 Scope . 11 2 Normative references . 11 3 Terms and definitions . 12 4 Lightning protection system (LPS) 15 4.1 Class of LPS . 15 4.2 Design of the LPS . 16 4.3 Continuity of st
19、eelwork in reinforced concrete structures . 16 5 External lightning protection system . 17 5.1 General . 17 5.1.1 Application of an external LPS . 17 5.1.2 Choice of external LPS 17 5.1.3 Use of natural components 17 5.2 Air-termination systems . 18 5.2.1 General . 18 5.2.2 Positioning 18 5.2.3 Air-
20、terminations against flashes to the side of tall structures 19 5.2.4 Construction 20 5.2.5 Natural components. 20 5.3 Down-conductor systems. 21 5.3.1 General . 21 5.3.2 Positioning for an isolated LPS 22 5.3.3 Positioning for a non-isolated LPS . 22 5.3.4 Construction 23 5.3.5 Natural components. 2
21、3 5.3.6 Test joints 24 5.4 Earth-termination system . 24 5.4.1 General . 24 5.4.2 Earthing arrangement in general conditions . 25 5.4.3 Installation of earth electrodes . 26 5.4.4 Natural earth electrodes 27 5.5 Components 27 5.5.1 General . 27 5.5.2 Fixing 28 5.5.3 Connections 28 5.6 Materials and
22、dimensions 28 5.6.1 Materials . 28 5.6.2 Dimensions . 28 6 Internal lightning protection system 30 6.1 General . 30 6.2 Lightning equipotential bonding . 31 6.2.1 General . 31 6.2.2 Lightning equipotential bonding for metal installations . 31 6.2.3 Lightning equipotential bonding for external conduc
23、tive parts 32 6.2.4 Lightning equipotential bonding for internal systems 33 62305-3 IEC:2010 3 6.2.5 Lightning equipotential bonding for lines connected to the structure to be protected 33 6.3 Electrical insulation of the external LPS 34 6.3.1 General . 34 6.3.2 Simplified approach . 35 6.3.3 Detail
24、ed approach . 35 7 Maintenance and inspection of an LPS . 35 7.1 General . 35 7.2 Application of inspections 36 7.3 Order of inspections 36 7.4 Maintenance 36 8 Protection measures against injury to living beings due to touch and step voltages 36 8.1 Protection measures against touch voltages 36 8.2
25、 Protection measures against step voltages 37 Annex A (normative) Positioning the air-termination system . 38 Annex B (normative) Minimum cross-section of the entering cable screen in order to avoid dangerous sparking . 43 Annex C (informative) Evaluation of the separation distance s . 44 Annex D (n
26、ormative) Additional information for LPS in the case of structures with a risk of explosion 50 Annex E (informative) Guidelines for the design, construction, maintenance and inspection of lightning protection systems . 57 Bibliography 154 Figure 1 Protection angle corresponding to the class of LPS 1
27、9 Figure 2 Loop in a down-conductor 23 Figure 3 Minimum length l1of each earth electrode according to the class of LPS . 25 Figure A.1 Volume protected by a vertical air-termination rod 38 Figure A.2 Volume protected by a vertical air-termination rod 39 Figure A.3 Volume protected by a wire air-term
28、ination system . 39 Figure A.4 Volume protected by isolated wires combined in a mesh according to the protection angle method and rolling sphere method 40 Figure A.5 Volume protected by non-isolated wires combined in a mesh according to the mesh method and the protection angle method . 41 Figure A.6
29、 Design of an air-termination system according to the rolling sphere method . 42 Figure C.1 Values of coefficient kcin the case of a wire air-termination system . 44 Figure C.2 Values of coefficient kcin the case of multiple down-conductors system . 45 Figure C.3 Values of coefficient kcin the case
30、of a sloped roof with air-termination on the ridge . 47 Figure C.4 Examples of calculation of the separation distance in the case of multiple down-conductors with an interconnecting ring of the down-conductors at each level . 48 Figure C.5 Values of coefficient kc in the case ofa meshed air-terminat
31、ion system, with a multiple down-conductors system . 49 Figure E.1 LPS design flow diagram 59 Figure E.2 LPS design for a cantilevered part of a structure . 65 Figure E.3 Measuring the overall electrical resistance 66 4 62305-3 IEC:2010 Figure E.4 Equipotential bonding in a structure with a steel re
32、inforcement . 68 Figure E.5 Typical methods of joining reinforcing rods in concrete (where permitted) . 69 Figure E.6 Example of clamps used as joints between reinforcing rods and conductors 70 Figure E.7 Examples for connection points to the reinforcement in a reinforced concrete wall 71 Figure E.8
33、 Use of metallic facade as natural down-conductor system and connection of facade supports 75 Figure E.9 Connection of the continuous strip windows to a metal facade covering 76 Figure E.10 Internal down-conductors in industrial structures. 79 Figure E.11 Installation of bonding conductors in reinfo
34、rced concrete structures and flexible bonds between two reinforced concrete parts . 81 Figure E.12 Protection angle method air-termination design for different heights according to Table 2 . 85 Figure E.13 Isolated external LPS using two isolated air-termination masts designed according to the prote
35、ction angle air-termination design method . 86 Figure E.14 Isolated external LPS using two isolated air-termination masts, interconnected by horizontal catenary wire . 87 Figure E.15 Example of design of an air-termination of a non-isolated LPS by air-termination rods 88 Figure E.16 Example of desig
36、n of an air-termination of a non isolated LPS by a horizontal wire according to the protection angle air-termination design method . 89 Figure E.17 Protected volume of an air- termination rod on a sloped surface using the protection angle design method 90 Figure E.18 Design of an LPS air-termination
37、 conductor network on a structure with complicated shape 91 Figure E.19 Design of an LPS air-termination according to the protection angle method, mesh method and general arrangement of air-termination elements . 92 Figure E.20 Space protected by two parallel air-termination horizontal wires or two
38、air-termination rods (r ht) . 93 Figure E.21 Three examples of design of non-isolated LPS air-termination according to the mesh method air-termination design . 95 Figure E.22 Four examples of details of an LPS on a structure with sloped tiled roofs . 98 Figure E.23 Air-termination and visually conce
39、aled conductors for buildings less than 20 m high, with sloping roofs . 99 Figure E.24 Construction of an LPS using natural components on the roof of the structure . 101 Figure E.25 Positioning of the external LPS on a structure made of isolating material e.g. wood or bricks with a height up to 60 m
40、 with flat roof and with roof fixtures 102 Figure E.26 Construction of air-termination network on a roof with conductive covering where puncturing of the covering is not acceptable . 103 Figure E.27 Construction of external LPS on a structure of steel-reinforced concrete using the reinforcement of t
41、he outer walls as natural components . 104 Figure E.28 Example of an air-termination stud used on car park roofs 105 Figure E.29 Air-termination rod used for protection of a metallic roof fixture with electric power installations which are not bonded to the air-termination system 106 Figure E.30 Met
42、hod of achieving electrical continuity on metallic parapet capping . 107 Figure E.31 Metallic roof fixture protected against direct lightning interception, connected to air-termination system 110 62305-3 IEC:2010 5 Figure E.32 Examplesof lightning protection of a house with a TV antenna 113 Figure E
43、.33 Installation of lightning protection of metallic equipment on a roof against a direct lightning flash . 114 Figure E.34 Connection of natural air-termination rod to air-termination conductor . 116 Figure E.35 Construction of the bridging between the segments of the metallic facade plates 117 Fig
44、ure E.36 Installation of external LPS on a structure of insulating material with different roof levels . 120 Figure E.37 Five examples of geometry of LPS conductors 121 Figure E.38 Construction of an LPS using only two down-conductors and foundation earth electrodes 122 Figure E.39 Four examples of
45、connection of earth-termination to the LPS of structures using natural down-conductors (girders) and detail of a test joint 126 Figure E.40 Construction of foundation earth ring for structures of different foundation design . 130 Figure E.41 Two examples of vertical electrodes in type A earthing arr
46、angement . 131 Figure E.42 Meshed earth-termination system of a plant 135 Figure E.43 Example of an equipotential bonding arrangement 142 Figure E.44 Example of bonding arrangement in a structure with multiple point entries of external conductive parts using a ring electrode for interconnection of b
47、onding bars . 143 Figure E.45 Example of bonding in the case of multiple point entries of external conductive parts and an electric power or communication line using an internal ring conductor for interconnection of the bonding bars . 144 Figure E.46 Example of bonding arrangement in a structure wit
48、h multiple point entries of external conductive parts entering the structure above ground level 145 Figure E.47 Directions for calculations of the separation distance, s, for a worst case lightning interception point at a distance l from the reference point according to 6.3 . 147 Table 1 Relation be
49、tween lightning protection levels (LPL) and class of LPS (see IEC 62305-1) 16 Table 2 Maximum values of rolling sphere radius, mesh size and protection angle corresponding to the class of LPS . 19 Table 3 Minimum thickness of metal sheets or metal pipes in air-termination systems . 21 Table 4 Typical preferred values of the distance between down-conductors accor
