1、 International Telecommunication Union ITU-T K.65TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2011) SERIES K: PROTECTION AGAINST INTERFERENCE Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices Recommendation ITU-T K.65 Rec
2、. ITU-T K.65 (01/2011) i Recommendation ITU-T K.65 Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices Summary Recommendation ITU-T K.65 specifies the overvoltage requirements and test procedures for termination modules, with cont
3、acts for test ports or surge protective devices (SPDs), used for symmetric pair conductors subjected to overvoltages and overcurrents. Overvoltages or overcurrents covered by this Recommendation include surges due to lightning on or near the line plant, short-term induction of alternating voltages f
4、rom adjacent power lines or railway systems, earth potential rise due to power faults, and direct contacts between telecommunication lines and power lines. Major changes compared with the 2004 version of this Recommendation include: the addition of a mains contact test to the equipment side of a mod
5、ule with series elements; a reduction of the current magnitude for test Figure C.2 and for the customer side test for test Figure C.3 (tests 2.2 and 2.3); a revision of Figure E.1 10/350 s current generator to be in line with Recommendation ITU-T K.44, Figure II.4-1 10/350 s current surge generator;
6、 the addition of information on the use of fail-safes; the addition of a coordination test, for modules with series elements, to check that surges under the firing voltage of the gas discharge tube (GDT) will not damage the series elements; the addition of a high voltage a.c. test to simulate a volt
7、age 230 V a.c. which will operate a 600 V GDT. History Edition Recommendation Approval Study Group 1.0 ITU-T K.65 2004-12-14 5 2.0 ITU-T K.65 2011-01-13 5 ii Rec. ITU-T K.65 (01/2011) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of te
8、lecommunications, 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 tele
9、communications 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
10、procedure laid down in WTSA Resolution 1. In some areas of information technology which 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
11、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
12、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 RIGH
13、TS 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
14、 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 m
15、ay 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 2011 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
16、.65 (01/2011) iii Table of Contents Page 1 Scope 1 2 References. 2 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Definitions 2 4 Abbreviations 8 5 Conventions 8 6 Service and test conditions . 8 6.1 Service conditions 8 6.2 Test temperature and humidity . 9 6.3 Termination module and SPD testing
17、 . 9 6.4 Termination module preparation 9 6.5 Test methods . 10 6.6 Termination module/SPD performance: pass/failure criteria . 10 6.7 Determining the required tests 11 6.8 Acceptance test requirements for termination modules/SPDs in MDFs which meet certain conditions 11 7 General requirements 12 7.
18、1 Manufacturer declaration 12 7.2 Use of fail-safes 12 7.3 Breakdown voltage of the termination . 12 7.4 Caution . 12 7.5 Ball bearings . 13 Annex A Dimensioning of terminating wires for all voltage/current tests . 19 Annex B Connection details for voltage tests on termination modules 20 Annex C Con
19、nection details for current tests on termination modules 25 Annex D Test method for tests in aqueous solution . 29 Annex E 30 Appendix I Information on how to test termination modules with SPDs . 31 I.1 Introduction 31 I.2 Termination modules used in the access network 31 I.3 Termination modules use
20、d in MDFs in operator buildings and customer premises 32 iv Rec. ITU-T K.65 (01/2011) Page Appendix II Application . 34 II.1 Environment . 34 II.2 Termination module and SPD types . 34 II.3 Dry termination module and SPD tests 34 II.4 Filled termination module and SPD tests . 34 II.5 Application . 3
21、4 Bibliography. 35 Rec. ITU-T K.65 (01/2011) 1 Recommendation ITU-T K.65 Overvoltage and overcurrent requirements for termination modules with contacts for test ports or surge protective devices 1 Scope This Recommendation specifies the requirements and test procedures for termination modules with c
22、ontacts for test ports or SPDs (see clause 3.2.15) used for symmetric pair conductors subjected to overvoltages and overcurrents. Note, other Recommendations exist, such as ITU-T K.12 and ITU-T K.28, specifying characteristics for surge protective components (SPCs). An example of where termination m
23、odules included in the scope of this Recommendation may be used is given in Figure 1. The following types of terminating modules covered by this Recommendation are: a termination module with terminals but without the facility for an SPD; a termination module with terminals and the facility for an SP
24、D; an integral termination module/SPD. The termination module and SPD are not meant to be separated. This Recommendation does not cover the requirements of termination modules used in equipment. These are covered by the relevant equipment Recommendations, i.e., b-ITU-T K.20, b-ITU-T K.21 or b-ITU-T
25、K.45. It does not cover either the requirements of insulation displacement connectors or termination modules without contacts. These are covered by ITU-T K.55. Refer to Appendix I for information on when and how to test termination modules. Basic Recommendation ITU-T K.44 (test methods and test circ
26、uits) is an integral part of this Recommendation. This Recommendation should be read in conjunction with ITU-T K.11, ITU-T K.39, ITU-T K.46, ITU-T K.47 and IEC 61643-21. Figure 1 Example of where termination modules are used in the network Linecard MDFAbove groundcross-connectframeLT and/orNTUndergr
27、oundjointCustomerequipmentOutdoorcabinet/housingTermination modules in equipment are covered by the relevant equipment RecommendationsK.065_F012 Rec. ITU-T K.65 (01/2011) 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, c
28、onstitute 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 are therefore encouraged to investigate the possibility of applying the most recent edition of th
29、e 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 a stand-alone document, the status of a Recommendation. ITU-T K.11 Recommendation ITU-T K.11 (2
30、009), Principles of protection against overvoltages and overcurrents. ITU-T K.12 Recommendation ITU-T K.12 (2010), Characteristics of gas discharge tubes for the protection of telecommunications installations. ITU-T K.28 Recommendation ITU-T K.28 (1993), Characteristics of semi-conductor arrester as
31、semblies for the protection of telecommunications installations. ITU-T K.39 Recommendation ITU-T K.39 (1996), Risk assessment of damages to telecommunication sites due to lightning discharges. ITU-T K.44 Recommendation ITU-T K.44 (2008), Resistibility tests for telecommunication equipment exposed to
32、 overvoltages and overcurrents Basic Recommendation. ITU-T K.46 Recommendation ITU-T K.46 (2008), Protection of telecommunication lines using metallic symmetric conductors against lightning-induced surges. ITU-T K.47 Recommendation ITU-T K.47 (2008), Protection of telecommunication lines using metal
33、lic conductors against direct lightning discharges. ITU-T K.55 Recommendation ITU-T K.55 (2002), Overvoltage and overcurrent requirements for insulation displacement connectors (IDC) terminations. ITU-T K.77 Recommendation ITU-T K.77 (2009), Characteristics of metal oxide varistors for the protectio
34、n of telecommunications installations ITU-T K.82 Recommendation ITU-T K.82 (2010), Characteristics and ratings of solid-state, self-restoring overcurrent protectors for the protection of telecommunications installations. IEC 61643-21 IEC 61643-21 ed1.0 (2009), Low voltage surge protective devices Pa
35、rt 21: Surge protective devices connected to telecommunications and signalling networks Performance requirements and testing methods. IEC 60695-2-10 IEC 60695-2-10 ed1.0 (2000), Fire hazard testing Part 2-10 Glowing/hot-wire based test methods Glow-wire apparatus and common test procedure. 3 Definit
36、ions 3.1 Terms defined elsewhere The majority of definitions used in this Recommendation are defined in ITU-T K.44. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 above ground: A termination module/surge protective device is considered to be above gro
37、und if the joint enclosure is not normally exposed to water. Rec. ITU-T K.65 (01/2011) 3 3.2.2 below ground: A termination module/surge protective device is considered to be used below ground when the joint enclosure may be exposed to damp or wet conditions on a regular basis, e.g., a direct buried
38、joint or a joint in a pit or manhole. A joint installed in a building basement or an enclosure is not considered below ground if flooding and water ingress is prevented. 3.2.3 controlled environment: The humidity is controlled using energy, e.g., air-conditioning. 3.2.4 earthing bar: A part or parts
39、 intended for providing an earthing connection from the earth pin of the SPD to earth. This bar may be an integral part of the termination module or a separate component when SPDs are installed. 3.2.5 fail-safe: A device used in conjunction with a surge protective device (SPC) to prevent excessive t
40、emperature rise of the SPC. If the SPC reaches a set temperature, due to the current being conducted, the fail-safe will operate and short out the SPC. 3.2.6 insulation displacement connector (IDC): An IDC is an interconnecting or terminating element for symmetric pair conductors where the insulatio
41、n is mechanically displaced during the termination process. A 2-wire connector is used to connect two wires together. A 3-wire connector is used to connect a conductor or tap from the main conductor. A modular connector, or multi-pair connector, is a connector containing more than one termination. C
42、onnectors can be either “dry“ or “filled“. A filled connector is filled with grease or gel to make it moisture resistant. 3.2.7 insulation resistance (IR): Insulation resistance is the resistance from one connection point to an adjacent connection point or earth. 3.2.8 protection circuit (PCT): A pr
43、otection circuit contains one or more surge protective devices or protective components. It may include a printed circuit board. 3.2.9 protection holder: A component used to support and electrically connect to a protection circuit (PCT). The protection holder and PCT may be integral (not separable).
44、 The combination of protection holder and PCT is a surge protective device (SPD). Different holders may be required for matching to the different types of termination modules. The termination module and SPD may also be integral (not separable). 3.2.10 protective component (PC): A protective componen
45、t is any component used in a protection circuit which cannot be classified as a surge protective device (SPC). Examples of PCs are resistors, PTCs and fail-safes. 3.2.11 semi-controlled environment: An attempt has been made to control the environment by passive means, e.g., by sealing to reduce the
46、probability of water ingress, or by ventilation to reduce the probability of water condensation. 3.2.12 surge: Temporary excessive voltage or current, or both, coupled on a telecommunication line, from an external electrical source. NOTE 1 Typical electrical sources are lightning and AC/DC power sys
47、tems. NOTE 2 Electrical source coupling can be one or more of the following: electric field (capacitive), magnetic field (inductive), conductive (resistive), electromagnetic field. 3.2.13 surge protective component (SPC) (adapted from b-IEC Electropedia, 151-11-21): Constitutes part of a surge prote
48、ctive device which cannot be physically divided into smaller parts without losing its protective function. NOTE The protective function is non-linear. Amplitude restriction effectively begins when the amplitude attempts to exceed the predetermined threshold value of the component. 4 Rec. ITU-T K.65
49、(01/2011) 3.2.14 surge protective device (SPD): Device that restricts the voltage of a designated port or ports, caused by a surge, when it exceeds a predetermined level. 1) Secondary functions may be incorporated, such as a current limiting device to restrict a terminal current. 2) Typically, the protective circuit has at least one non-linear voltage-limiting surge protective component. 3) An SPD is a combination of a protection circuit and holder. 3.2.15 terminati
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