ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护 K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges

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ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护  K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges  第 1 页 ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护  K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges  第 2 页 ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护  K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges  第 3 页 ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护  K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges  第 4 页 ITU-T K.47-2008 使用金属导体抗闪电放电的电信线路保护  K系列:干涉保护 Protection of telecommunication lines using metallic conductors against direct lightning discharges  第 5 页
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国外分类,ITU,ITU-T(电信标准分局),itu,使用,金属,导体,闪电,放电,电信,线路,保护,系列,干涉,保护,protection,of,telecommunication,lines,using,metallic,conductors,against,direct,lightning,discharges

I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU U n i o n K.47 (04/2008) SERIES K: PROTECTION AGAINST INTERFERENCE Protection of telecommunication lines using metallic conductors against direct lightning discharges Recommendation ITU-T K.47 Recommendation ITU-T K.47 Protection of telecommunication lines using metallic conductors against direct lightning discharges Summary Recommendation ITU-T K.47 specifies a procedure for the protection of telecommunication lines using metallic conductors against direct lightning discharges to the line itself or to structures that the line enters. The protection procedure is related to the exposure of the line to direct lightning discharges and includes the selection of cable characteristics/installation, bonding/earthing of the cable shield, use of shield wires, lightning protective cable, steel tube, lightning protective cable duct, installation of surge protective devices (SPDs) and route redundancy. Examples of application of this Recommendation are reported in Appendix III. Source Recommendation ITU-T K.47 was approved on 13 April 2008 by ITU-T Study Group 5 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Direct lightning, failure current, protection, risk, risk assessment, sheath breakdown current, test current. Rec. ITU-T K.47 (04/2008) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-T's purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words "shall" or some other obligatory language such as "must" and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http://www.itu.int/ITU-T/ipr/. © ITU 2009 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ii Rec. ITU-T K.47 (04/2008) CONTENTS Page 1 Scope ............................................................................................................................ 1 2 References..................................................................................................................... 1 3 Definitions .................................................................................................................... 2 4 Reference configuration................................................................................................ 3 5 Expected risk of damage............................................................................................... 5.1 General ........................................................................................................... 5.2 Frequency of damage to cables .................................

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