IEC_62305-4_Protection_Against_Lightning.pdf

NORMECEIINTERNATIONALEIECINTERNATIONAL62305-4STANDARDPremiere editionFirst edition2006-01Protection contre la foudrePartie 4:Reseaux de puissance et de communicationdans les structuresProtection against lightningPart 4:Electrical and electronic systemswithin structuresIEC 2006 Droits de reproduction reserves-Copyright-all rights reservedAucune partie de ce publication ne peutNo part of this publication may be reproduced or utilized in anyutilisee sous quelque forme que ce soit et par aucun procede,form or by any means,electronic or mechanical,includingelectronique ou mecanique,y compris la photocopie et lesphotocopying and microfilm,without permission in writing frommicrofilms,sans Iaccord ecrit de lditeur.the publisher.Intemational Electrotechnical Commission,3.rue de Varembe,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chCODE PRIXCommission Electrotechnique InternationalePRICE CODEXDInternational Electrotechnical CommissionMexnyHapogHan 3neKTpoTexHnueckan KoMMCCHFour prix,volr cataogue en vigueurFor price,see current calalogue62305-41EC:2006-5-Figure 7-Utilization of reinforcing rods of a structure for equipotential bonding.47Figure 8-Equipotential bonding in a structure with steel reinforcement.49Figure 9-Integration of electronic systems into the bonding network.51Figure 10-Combinations of integration methods of electronic systems into thebonding network.53Figure A.1-LEMP situation due to lightning flash.73Figure A.2-Simulation of the rise of magnetic field by damped oscillations.77Figure A.3-Large volume shield built by metal reinforcement and metal frames.79Figure A.4-Volume for electrical and electronic systems inside an inner LPZ n.81Figure A.5-Reducing induction effects by line routing and shielding measures.85Figure A.6-Example of an LPMS for an office building.87Figure A.7-Evaluation of the magnetic field values in case of a direct lightning flash.91Figure A.8-Evaluation of the magnetic field values in case of a nearby lightning flash.95Figure A.9-Distance sa depending on rolling sphere radius and structure dimensions.101Figure A.10-Types of grid-like large volume shields.105Figure A.11-Magnetic field strength H1/max inside a grid-like shield Type 1.107Figure A.12-Magnetic field strength H1/max inside a grid-like shield Type 1.107Figure A.13-Low-level test to evaluate the magnetic field inside a shielded structure.111Figure A.14-Voltages and currents induced into a loop built by lines.113Figure B.1-Upgrading of LEMP protection measures and electromagneticcompatibility in existing structures.125Figure B.2-Possibilities to establish LPZs in existing structures.137Figure B.3-Reduction of loop area using shielded cables close to a metal plate.141Figure B.4-Example of a metal plate for additional shielding.143Figure B.5-Protection of aerials and other external equipment.147Figure B.6-Inherent shielding provided by bonded ladders and pipes.149Figure B.7-Ideal positions for lines on a mast(cross-section of steel lattice mast).151Figure C.1-Example for the application of SPD in power distribution systems.157Figure C.2-Basic model for energy coordination of SPD.161Figure C.3-Combination of two voltage-limiting type SPDs.163Figure C.4-Example with two voltage-limiting type MOV 1 and MOV 2.167Figure C.5-Combination of voltage-switching type spark gap and voltage-limiting typeM0V.169Figure C.6-Example with voltage-switching type spark gap and voltage-limiting type MOV171Figure C.7-Determination of decoupling inductance for 10/350 us and 0,1kA/us surges.173Figure C.8-Example with spark gap and MOV for a 10/350 us surge.177