1、1 UDC SSES GB P GB50057-20XX y!9?S Design code for protection of Structures against lightning 9| 2010 M 56 , 20XX X X ? 20XX X X L STy!SSES_f9 ? 2 SSESy!9?SDeTign code for protection of Structures against lightning GB 50057-20XX IS|o1?uMy!S?Sa9BvYp1pSS=M1uy!9?Sv(#M7b?S1= 9FBc M(tn 1p ? W%?d0d1p evM(
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5、CONTENTS 1 General principles lllllllllllllllll 8 2 Terms llllllllllllllllllll l 9 3 Classification of structures to be protected against lightning l14 4 Protection measures for structures against lightning lll 16 4.1 General llllllllllllllllllllll 16 4.2 Protection measures for first class of struc
6、tures to be protected against lightning lllllllllllll 16 4.3 Protection measures for second class of structures to be protected against lightning lllllllllllll 23 4.4 Protection measures for third class of structures to be protected against lightning lllllllllllll 29 4.5 Other protection measures ag
7、ainst lightning llllll 33 5 Lightning protection system lllllllllllll 36 5.1 Materials for lightning protection system llllllll 36 5.2 Air-termination system llllllllllllllll 37 5.3 Down-conductor system lllllllllllllll 40 5.4 Earth-termination system lllllllllllllll 41 6 Protection against LEMP lll
8、lllllllllll 44 6.1 General lllllllllllllllllllllll 44 6.2 Lightning protection zones and examples of protection against LEMPlllllllllllllllllllllll 44 6.3 Requirements for magnetic shielding, earthing and equipotential bonding lllllllllllllllll 46 6.4 Requirements for installation and selection of S
9、PDs llll 55 Annex A Expected annual number of lightning flash for structures 59 Annex B Structure parts which are apt to be struck by lightningl62 Annex C Conversion from power frequency earthing resistance of earth-termination system to impulse earthing resistance llll63 Annex D Determination of pr
10、otected volume of air-termination system with rolling sphere method lllllllllllll65 Annex E Values of coefficient kc llllllllllll74 Annex F Lightning currents lllllllllllllll76 Annex G Calculation of induced voltages and currents in loopsl78 7 Annex H Cross-section of the entering cable screen lllll
11、80 Annex J Surge protective deviceslllllllllllll82 J.1 SPDs used in electrical system llllllllllll 82 J.2 SPDs used in electronic system llllllllllll86 Explanations for the words used in this codelllllllll89 List of cited standards and documents llllllllllll90 Appendix: Explanationgs for clausesllll
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