ITU-T K 67-2015 Expected surges on telecommunication networks due to lightning (Study Group 5)《电信和信号网络的雷击浪涌的预期(研究组5)》.pdf
《ITU-T K 67-2015 Expected surges on telecommunication networks due to lightning (Study Group 5)《电信和信号网络的雷击浪涌的预期(研究组5)》.pdf》由会员分享,可在线阅读,更多相关《ITU-T K 67-2015 Expected surges on telecommunication networks due to lightning (Study Group 5)《电信和信号网络的雷击浪涌的预期(研究组5)》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
1、 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 U n i o n ITU-T K.67 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2015) SERIES K: PROTECTION AGAINST INTERFERENCE Expected surges on telecommunication networks due to lightning Recommendation ITU-T K.67 Rec. ITU-T K.67 (12/2015) i R
2、ecommendation ITU-T K.67 Expected surges on telecommunication networks due to lightning Summary Recommendation ITU-T K.67 allows the assessment of the characteristics (waveshapes and peak values) of the expected lightning surges on metallic telecommunication lines. These characteristics are presente
3、d as a function of the lightning current parameters and the location on the telecommunication network. A set of formulas and tables are provided, alongside the relevant instructions. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T K.67 2006-02-13 5 11.1002/1000/8737 2.0 ITU-
4、T K.67 2015-12-14 5 11.1002/1000/12673 Keywords Lightning, overcurrent, overvoltage, surge, telecommunication line. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.in
5、t/11.1002/1000/11830-en. ii Rec. ITU-T K.67 (12/2015) 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
6、 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, es
7、tablishes 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-Ts purview, the necessary
8、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
9、 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 equival
10、ents 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 RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claim
11、ed 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 no
12、t 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/IT
13、U-T/ipr/. ITU 2016 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T K.67 (12/2015) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defin
14、ed in this Recommendation . 1 4 Abbreviations and acronyms 2 5 Conventions 2 6 Reference configuration 2 7 Lightning parameters 3 8 Conducted surges due to direct flashes to a structure . 4 9 Induced surges due to flashes to or near to a structure . 5 10 Direct flashes to telecommunication lines 6 1
15、1 Flashes near telecommunication lines 6 Annex A Formulas for the loop inductances 7 A.1 Mutual inductance between a lightning flash and a loop . 7 A.2 Self-inductance of a loop 7 Appendix I Model to compute the lightning current in a telecommunication line due to a direct flash 8 I.1 Introduction 8
16、 I.2 Aerial line . 8 I.3 Buried line 9 Bibliography. 12 Rec. ITU-T K.67 (12/2015) 1 Recommendation ITU-T K.67 Expected surges on telecommunication networks due to lightning 1 Scope The scope of this Recommendation is to assess the overvoltages and overcurrents due to lightning at different points of
17、 the telecommunication access network, both outside and inside structures, i.e., exchanges, customer premises and remote sites. This Recommendation provides the tools that allow the user to obtain the peak values and waveshapes of the overvoltages and overcurrents. 2 References The following ITU-T R
18、ecommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation ar
19、e therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as
20、a stand-alone document, the status of a Recommendation. ITU-T K.98 Recommendation ITU-T K.98 (2014), Overvoltage protection guide for telecommunication equipment installed in customer premises. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere:
21、3.1.1 lightning protection level (LPL): b-IEC 62305-1 Number related to a set of lightning current parameters values relevant to the probability that the associated maximum and minimum design values will not be exceeded in naturally occurring lightning. NOTE Lightning protection level is used to des
22、ign protection measures according to the relevant set of lightning current parameters. 3.1.2 surge: b-ITU-T K.46 Temporary excessive voltage or current, or both, coupled on a telecommunication line from an external electrical source. 3.2 Terms defined in this Recommendation This Recommendation defin
23、es the following terms: 3.2.1 front time or rise time (T1): The front time or rise time of an impulse voltage is defined as 1.67 times the time interval between the instants when the impulse is 30% and 90% of the peak value. The front time of an impulse current is defined as 1.25 times the interval
24、between the instants when the impulse is 10% and 90% of the peak value. 3.2.2 surge protective device (SPD): A device that is intended to mitigate surge overvoltages and overcurrents of limited durations. It may consist of a single component or have a more complex design, where several functions are
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