1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU K.53 (02/2000) SERIES K: PROTECTION AGAINST INTERFERENCE Values of induced voltages on telecommunication installations to establish telecom and a.c. power and railway operators res ponsi bi I it es ITU-T Reco
2、mmendation K.53 (Formerly CCITT Recommendation) ITU-T RECOMMENDATION K.53 VALUES OF INDUCED VOLTAGES ON TELECOMMUNICATION INSTALLATIONS TO ESTABLISH TELECOM AND A.C. POWER AND RAILWAY OPERATORS RESPONSIBILITIES Summary This Recommendation gives permissible voltages on a telecommunications line cause
3、d by influence from a nearby a.c. power or railway plant during normal operation and fault condition. These values set the maximum permissible voltages and durations that a.c. power and railway operators are allowed to cause by any type of electromagnetic coupling on a telecommunications line withou
4、t being responsible for mitigation measures. Source ITU-T Recommendation K.53 was prepared by ITU-T Study Group 5 (1997-2000) and was I I approved under the WTSC Resolution No. 1 procedure on 25 February 2000. Recommendation K.53 (02/2000) 1 FOREWORD ITU (International Telecommunication Union) is th
5、e United Nations Specialized Agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standar
6、dizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by th
7、e Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration
8、“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property R
9、ight. The 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, the ITU had not received notice
10、of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 2000 All rights reserved. No part
11、of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 11 Recommendation K.53 (02/2000) 1 2 3 4 4.1 CONTENTS Page Scope . References . Definitions Permissible induced v
12、oltages on a telecommunications line Long-term levels . 4.1,l Fundamental frequency 4.1.2 Noise 4.2 Short-term levels . 4.2.1 General . 4.2.2 Typical situation 4.2.3 Severe situation Recommendation K.53 (02/2000) 1 1 2 2 . 111 STDaITU-T RECMN Km53-ENGL 2000 4862571 Ob83480 200 m Foreword The electro
13、magnetic interference between a.c. power and electrified railway plants and telecommunication plants may appear through the mechanisms of inductive, capacitive and conductive coupling which causes voltages on the telecommunication plants in the power and audio frequency range. Voltage levels are her
14、e defined in order to guarantee satisfactory coexistence between telecommunication systems and power and railway systems, taking into account that these voltages can represent a danger to the personnel working on the telecommunication plant and may produce damage, malfunction or disturbance to the e
15、quipment installed in it. In defining these levels, telecommunication systems as well as power and railway systems are seen as a whole, without seeing their details (cables, equipment, etc). This means that the levels do not concern a particular part of the telecommunication system, but the whole sy
16、stem. From another point of view, the levels represent an agreement between the owners of the systems (the so called operators). Thus, such an agreement is of interest for the operators and of those companies involved in the design and the maintenance of the telecommunication, power and railway plan
17、ts. Introduction This Recommendation sets permissible voltages in telecommunication lines caused by the electromagnetic influence from nearby a.c. power and railway plants during normal operation and fault condition. They are related to the worst interference situation. The permissible voltages are
18、those, which a.c. power and electrified railways systems are allowed to cause to a telecommunications line, without the operators of a.c. power and electrified railways systems being responsible for mitigation measures. The levels set in this Recommendation will be reproduced in the Directives Vol.
19、VI 2 in an appropriate way. iv Recommendation K.53 (02/2000) - - STD.ITU-T RECMN K-53-ENGL 2000 m 4862591 0683ir81 147 m Recommendation K.53 VALUES OF INDUCED VOLTAGES ON TELECOMMUNICATION INSTALLATIONS TO ESTABLISH TELECOM AND A.C. POWER AND RAILWAY OPERATORS RESPONSIBILITIES (Geneva, 2000) 1 Scope
20、 This Recommendation specifies the maximum allowed voltages caused by inductive, capacitive and conductive coupling for which a.c. power and railway operators shall not bear the responsibility for mitigation measures. It covers the levels of influence from the fundamental frequency of power and rail
21、ways systems and the psophometric level. When the electromagnetic interference is such that more than one coupling are acting at the same time, the permissible voltages apply to the total interference results. They establish an official agreement between telecommunication operators and power and rai
22、lway operators in order to clearly share responsibilities, and, as a consequence, if necessary, the relevant expenses for mitigation measures. The latter is out of the scope of this Recommendation. However the principle of priority (first coming), national regulations and existing agreements between
23、 operators should be taken into account. The limit values only a ply to the frequency(-ies) used in the area, where the telecommunication plant is located, i.e. 16 /3, 50 or 60 Hz, and the psophometric noise. They only apply to parts of telecommunications systems that may be exposed to a.c. power an
24、d railway systems (e.g. outdoor lines, exchanges). ;P 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 Recom
25、mendations and other references are subject to revision; all 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 regul
26、arly published. i ITU-T Recommendation K.33 (1996), Limits for people safety related to coupling into telecommunications systems from a. c. electric power and a.c. electrified railway installations in fault conditions. CCITT Directives concerning the protection of telecommunication lines against har
27、mful effects from electric power and electrified railway lines, Volume VI: Danger and disturbance, 1990. ITU-T Recommendation K. 10 (1996), Low frequency interference due to unbalance about earth of telecommunication equipment. 2 3 Recommendation K.53 (02/2000) 1 STD.ITU-T RECMN K.53-ENGL ZOOU 48b25
28、9L Ob83482 083 3 Definitions This Recommendation defines the following terms: 3.1 Induced voltage: The induced voltage in a given point of a telecommunications installation is the voltage caused in that point by the electromagnetic coupling with nearby a.c. power or electrified railway line. It can
29、be a voltage to earth if calculated or measured as the difference between the potential caused in that point by all the electromagnetic coupling phenomena acting together, and the potential of earth. It can be a voltage between two metallic elements of the telecommunication installation if calculate
30、d or measured as difference between the potentials caused in such two metallic elements (e.g. voltage between the two wires of a pair, wire to sheath voltage, etc.) by all the electromagnetic coupling phenomena acting together. The frequency is the one used in the area, where the telecommunication p
31、lant is located, i.e. 16*h, 50 or 60 Hz. 3.2 Induced psophometric voltage: The induced psophometric voltage in a given point of a telecommunications line caused by a nearby a.c. power or electrified railway line by all the electromagnetic coupling phenomena acting together, is the voltage, U, in tha
32、t point appearing between the two wires of the pair given by the expression: in which: Uf is the component at frequency If“ of the voltage due to the presence of the power line and measured between those two wires; is the weighting for this frequency given in the weighting table associated with the
33、psophometer specification. The table gives values of pf for the various frequencies, when p800 is equal by convention to 1000. l Pf NOTE - The table of the psophometric weightings is given in the Directives Vol. VI. 3.3 Reference earth: A point in the soil whose electrical potential is zero. This co
34、ncept applies both to calculation and measurement of voltages, considered as difference of the potential of the induced telecommunication plant and the potential of the soil. 4 Permissible induced voltages on a telecommunications line 4.1 Long-term levels 4.1.1 Fundamental frequency The long-term pe
35、rmissible induced voltage with respect to the reference earth at any point of a telecommunications line is 60 Vms. By long-term is meant more than 1 s in this context. 4.1.2 Noise The long-term permissible induced psophometric voltage between the two wires of a pair is 0.5 mV at any terminal of a te
36、lecommunications line. The LCL of the telecommunications installation shall be in accordance with Recommendation K. 1 O 31. NOTE - LCL values as indicated in clause 6K.10 lead to a permissible induced psophometric longitudinal voltage of 200 mV at any terminal of a telecommunications line. 2 Recomme
37、ndation K.53 (02/2000) By long-term is meant more than 1 s in this context. 0.2 t 50.35 0.35 t 50.5 0.5 t I 1.0 4.2 Short-term levels 780 650 430 4.2.1 General The short-term permissible induced voltage at any point of a telecommunications line is indicated in 4.2.2 and 4.2.3 for typical and severe
38、situation respectively. The meaning of typical or severe situation is given in Recommendation K.33 i. Induced duration ts t 50.2 0.2 t 50.35 4.2.2 Typical situation If the line has metallic signal conductors or remote feeding telecommunication (FWT) circuit, the permissible short-term induced voltag
39、e at any point of a telecommunications line is stated in Table 1. Induced voltage U2 V,m, 1500 1 O00 Table 1K.53 - Permissible short-term induced voltages for typical situation 0.5 t I 1.0 I Induced duration ts 1 Induced voltage U1 VrmJ I 43 O I t 50.2 I 1030 I NOTE - U1 is derived from the same dis
40、sipation in components connected to the line as for 650 V, 0.5 s, which has been used until now. If the metallic element of the line is not intended for transmitting signals or for the supply of power to equipment, the permissible short-term induced voltage at any point of a telecommunications line
41、is stated in Table 2. 0.35 t 5 0.5 I 650 I Recommendation K.53 (02/2000) 3 STD-ITU-T RECMN K-53-ENGL 2000 m 4Bb259L Ob83484 95b m Induced duration tis t 0.1 4.2.3 Severe situation The permissible short-term induced voltage at any point of a telecommunications line is stated in Table 3. Induced volta
42、ge U3 V, 430 Table 3K.53 - Permissible short-term induced voltages for severe situation I 0.1 It 1 I 300 I I NOTE - U3 has been derived from Recommendation K.33 for severe situation. I 4 Recommendation K.53 (02/2000) STDmITU-T RECMN K.53-ENGL 2000 48b259L Ob83485 892 eries A leries B leries C leries
43、 D ieries E ieries F Series G Series H Series I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols
44、, classification General telecommunication statistics General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems I
45、ntegrated services digital network Transmission of television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telepho
46、ne circuits telegraphy, facsimile and leased circuits Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Tel
47、egraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communications Global information infrastructure and Internet protocol aspects Languages and general software aspects for telecommunication systems Printed in Switzerland Geneva, 2000
