1、 International Telecommunication Union ITU-T K.68TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (04/2008) SERIES K: PROTECTION AGAINST INTERFERENCE Operator responsibilities in the management of electromagnetic interference by power systems on telecommunication systems Recommendation ITU-T K.68 Rec
2、. ITU-T K.68 (04/2008) i Recommendation ITU-T K.68 Operator responsibilities in the management of electromagnetic interference by power systems on telecommunication systems Summary Recommendation ITU-T K.68 deals with the management of electromagnetic (e.m.) interference produced by electric power s
3、ystems and electrified traction systems on telecommunication systems. This Recommendation defines the procedure to evaluate the acceptability of an e.m. interference and gives: the criteria defining the interference situations to be examined; the interference management voltages to be applied; the i
4、nstallation conditions of electric power, electrified traction and telecommunication systems under which the management voltages are applicable. This Recommendation establishes an official agreement between telecommunication operators and power and railway operators in order to clearly share respons
5、ibilities, and, as a consequence, if necessary, the relevant expenses for mitigation measures. Source Recommendation ITU-T K.68 was approved on 13 April 2008 by ITU-T Study Group 5 (2005-2008) under Recommendation ITU-T A.8 procedure. Keywords Damage, danger, disturbance, immunity, malfunction, nois
6、e, power frequency interference, resistibility, responsibility, safety. ii Rec. ITU-T K.68 (04/2008) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Teleco
7、mmunication 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 As
8、sembly (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 w
9、hich fall within ITU-Ts 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
10、 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 lan
11、guage 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
12、 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
13、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 t
14、he 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. Rec. ITU-T K.68 (04/2008) iii CONTENTS Page 1 Scope 1 2 References. 2 3 Definitions 2 4 Procedure
15、 for evaluating the e.m. interference. 7 4.1 General . 7 4.2 Interference frame 8 4.3 Collection of electrical information of inducing plants 9 4.4 Evaluation of the interference results and compliance with the management voltages . 9 5 Interference situations to be examined . 10 5.1 Coupling types
16、to be considered. 10 5.2 Reference influence distance 11 6 Management voltages . 19 6.1 Criteria defining the application of the management voltages. 19 6.2 Danger voltages: Limits . 19 6.3 Damage voltages 20 6.4 Immunity voltages 21 6.5 Noise voltage: Limit. 21 7 Reference interference conditions 2
17、2 7.1 General . 22 7.2 Conditions related to the inducing plant. 22 7.3 Conditions related to the telecommunication plant 26 8 Determination of compliance with the management voltages 26 8.1 General . 26 8.2 Superposition of the effects 27 8.3 Determination of compliance through calculations 27 8.4
18、Determination of compliance through measurements 27 9 Operators responsibilities. 28 10 Management of interference. 28 10.1 General . 28 10.2 Plant life 28 10.3 Exchange of information 28 10.4 Plant documentation . 29 Annex A Method for the evaluation of the reference influence distance . 30 A.1 Ind
19、uctive coupling 30 A.2 Conductive coupling. 35 Appendix I Weighting factors for use in determining the psophometrically weighted voltage 42 iv Rec. ITU-T K.68 (04/2008) Page Appendix II Values for the quantities affecting the reference influence distance for inductive coupling 45 II.1 Guidance value
20、s 45 II.2 Values of the parameters for the RID evaluation: Inductive coupling. 52 II.3 Values of the parameters for the RID evaluation: Conductive coupling 55 Appendix III Steps for determining the RID values due to a.c. power or electrified traction line . 56 Bibliography. 59 Rec. ITU-T K.68 (04/20
21、08) v Introduction The Directives (Directives concerning the protection of telecommunication lines against harmful effects from electric power and electrified railway lines) are the reference documents dealing with the electromagnetic interference (e.m. interference) produced by electric power syste
22、ms and electrified railway systems on telecommunication systems. The Directives (1988, 1989, 1999 and 2008 editions) are divided into 9 volumes, each dealing with a separate part of the overall subject. Their use can be guided as follows: For a broad understanding of telecommunication, power and rai
23、lway facilities and their mutual coupling effects, consult Volume I. For further information on inducing installations in power or electrified railway systems, consult Volume IV (railway systems) or Volume V (power systems). For understanding the physical-mathematical theory of the e.m. interference
24、 and to know calculation methods, at various levels of detail and precision, consult Volumes II and III. To understand the effects of induced voltages and currents, i.e., danger, damage and disturbance, and the recommended permissible values, consult Volume VI. For advice on protective components or
25、 complex protective devices, consult Volume VIII. For information on relevant testing and measuring techniques, consult Volume IX. NOTE The content of the Directives has been formally agreed by ITU, CIGRE and UIC. Since their first edition (1952), the Directives have been the worldwide reference tex
26、t in the field of e.m. interference, used for establishing regional or national standards, even for topics not identical to the ones dealt with in the Directives but strictly related to them, like e.m. interference produced by electric power systems and electric traction systems on pipelines or meta
27、llic structures. The Directives were established when the number of actors involved in e.m. interference was low. Even if, in some countries, the liberalization in telecommunication, energy and transportation dates back a long time, in many countries there was only one telecommunication company, one
28、 energy company, one railway company. The solution of e.m. interference problems was managed by few specialists and had the character of scientific study. Now the number of actors is highly increased, and the solution of the e.m. interference problems must be treated as a normal design activity and
29、the need of information and the guidance of such actors are necessary. The Directives contain a very large amount of valuable information both at the scientific and practical design levels. Therefore, there is the need to guide through this information the mainly small companies or companies who cou
30、ld face the e.m. interference problems for the first time. In fact, the Directives do not answer the following questions: 1) who is responsible for the e.m. interference; 2) when the e.m. interference has to be evaluated; 3) how this evaluation shall be carried out. This Recommendation deals with th
31、e management of the e.m. interference; in particular, it aims to define: the maximum distance between the involved plants for evaluating the e.m. interference (when); the conditions (installation conditions, working conditions, energy flow, etc.) of the involved plants to which the management voltag
32、es are related (how); the Operators responsibilities for the e.m. interference (who). This Recommendation deals with all the aspects of the management of e.m. interference in a comprehensive manner. Rec. ITU-T K.68 (04/2008) 1 Recommendation ITU-T K.68 Operator responsibilities in the management of
33、electromagnetic interference by power systems on telecommunication systems 1 Scope This Recommendation gives the criteria defining situations to be examined and the installation conditions of both power and telecommunication plants under which the management voltages are applicable to the e.m. inter
34、ference produced on telecommunication systems by the following power systems: a.c. electric power systems; d.c. electric power systems; a.c. electrified traction systems; d.c. electrified traction systems; resulting from the following physical mechanisms: inductive coupling; conductive coupling; cap
35、acitive coupling; for different power system conditions: normal; fault; in the frequency range 0 Hz to 9 kHz. It covers the resulting effects of: danger to people; damage to the telecommunication system; disturbance to the telecommunication system (malfunction, noise). This Recommendation is applica
36、ble to all telecommunication lines with metallic elements. Fibre-optic cables are to be considered only if a metal conductor, screen or sheath, is included in their construction. The objective of this Recommendation is to establish: the procedure for evaluating the e.m. interference (clause 4); the
37、maximum distance between power and telecommunication plants for studying the e.m. interference between them (clause 5); the installation conditions (clause 7) of both power and telecommunication plants under which the interference results shall be evaluated (through calculations in accordance with v
38、olume II or III of the Directives, through measurements, or through a suitable combination of both) in order to check the compliance (clause 8) of the induced voltages on the telecommunication line with the appropriate management voltages (clause 6); an official agreement between telecommunication o
39、perators and electric power and electrified railway operators in order to clearly share responsibilities and, as a consequence, if necessary, the relevant expenses for mitigation measures (clause 9); 2 Rec. ITU-T K.68 (04/2008) a reminder of the need to maintain a suitable monitoring of the technica
40、l characteristics evolution of the plants involved in the interference to avoid, due to modifications, an acceptable interference evolving into an unacceptable one (clause 10). This Recommendation is applicable to all situations where a private or public telecommunication plant is liable to be influ
41、enced by one or more power plants. This Recommendation is applicable to new telecommunication and new power plants and also to existing plants where modifications are proposed, such as changes of system earthing, line configuration, operating voltage and fault current (also due to modifications in p
42、lants connected to another under consideration), which will significantly increase the existing levels of e.m. interference. This Recommendation shall be used in the determination of the types of coupling to be considered for various power system operating conditions, and in the comparison of predic
43、ted induced voltages with the management voltages given in clause 6. This Recommendation does not apply to e.m. interference from electric power systems with a nominal operating voltage below 1 kV. The definition of the mitigation measures, if necessary, is outside the scope of this Recommendation.
44、2 References The following ITU-T Recommendations 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 revisio
45、n; users of this Recommendation are 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 Re
46、commendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T K.10 Recommendation ITU-T K.10 (1996), Low frequency interference due to unbalance about earth of telecommunication equipment. IEC 60050-161 IEC 60050-161 (1990), International Electrotechnical Vocabulary
47、 Chapter 161: Electromagnetic compatibility. IEC 60050-448 IEC 60050-448 (1995), International Electrotechnical Vocabulary Chapter 448: Power system protection. IEC/TS 60479-1 IEC/TS 60479-1 (2005), Effects of current on human beings and livestock Part 1: General aspects. 3 Definitions This Recommen
48、dation defines the following terms: Unless defined in this Recommendation, the definitions given in IEC 60050-161 and IEC 60050-448 shall be applicable. 3.1 system: Generic word to encompass all the elements, parts, equipment connected together, of a given technology (electric power system, electrif
49、ied traction system, telecommunication system). 3.2 a.c. electric power system: Electrical system, operating with alternating current (a.c.), devoted to electrical energy transmission and distribution. Rec. ITU-T K.68 (04/2008) 3 NOTE Two-phase power systems operating at 16 Hz dedicated to the supply of a.c. electrified traction systems shall be considered as a.c. electrified power systems, even if the relevant conductors are placed on the same poles of traction lines. 3.3 d.c. electric power system:
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