1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T K.55TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2002) SERIES K: PROTECTION AGAINST INTERFERENCE Overvoltage and overcurrent requirements for insulation displacement connectors (IDC) terminations ITU-T Recommendation K.55 ITU-T Rec. K.55 (08/2002)
2、i ITU-T Recommendation K.55 Overvoltage and overcurrent requirements for insulation displacement connectors (IDC) terminations Summary This Recommendation specifies the overvoltage requirements and test procedures for Insulation Displacement Connectors (IDCs) used for symmetric pair conductors subje
3、cted 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 from adjacent power lines or railway systems, earth potential rise due to power faults and direct
4、 contacts between telecommunication lines and power lines. Source ITU-T Recommendation K.55 was prepared by ITU-T Study Group 5 (2001-2004) and approved under the WTSA Resolution 1 procedure on 13 August 2002. ii ITU-T Rec. K.55 (08/2002) FOREWORD The International Telecommunication Union (ITU) is t
5、he United Nations specialized agency in the field of telecommunications. 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
6、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
7、the 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 bot
8、h a telecommunication administration and a recognized operating agency. 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 ev
9、idence, 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
10、 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. ITU 2002 All rights reserved. No part of this publication may be reproduced, by any means wha
11、tsoever, without the prior written permission of ITU. ITU-T Rec. K.55 (08/2002) iii CONTENTS Page 1 Scope 1 2 References 1 3 Definitions and abbreviations. 2 3.1 Definitions 2 3.2 Abbreviations . 2 4 Tests 2 4.1 General test requirements. 2 4.2 Connector preparation 3 4.2.1 2 or 3 wire IDC connector
12、s 3 4.2.2 Multi pair IDC connectors 3 4.3 High voltage test methods 3 4.4 General failure criteria for IDC 3 4.5 Failure criteria for IDC for the mains power contact test 3 4.6 Ball bearings. 3 5 Electrical requirements and test procedures. 3 Annex A Dimensioning of terminating wires for all voltage
13、/current tests. 6 Annex B Connection details for voltage tests on multi pair connectors. 7 Annex C Connection details for current tests on multi pair connectors . 10 Annex D Test method for tests in aqueous solution . 11 Appendix I IDC service condition and application 11 I.1 Environment/ service co
14、nditions 11 I.1.1 Air pressure 11 I.1.2 Humidity. 11 I.2 Connector types and tests with respect to the service conditions 12 I.2.1 Dry connector Tests . 12 I.2.2 Filled Connector Tests . 12 ITU-T Rec. K.55 (08/2002) 1 ITU-T Recommendation K.55 Overvoltage and overcurrent requirements for insulation
15、displacement connectors (IDC) terminations 1 Scope This Recommendation specifies the overvoltage requirements and test procedures for Insulation Displacement Connectors (IDCs) used for symmetric pair conductors subjected to overvoltages and overcurrents. The basic ITU-T Rec. K.44 (test methods and t
16、est circuits) is an integral part of this Recommendation. This Recommendation should be read in conjunction with ITU-T Recs K.11, K.39, K.46 and K.47. An example of where connectors, included in the scope of this Recommendation, may be used, is given in Figure 1. This Recommendation does not cover t
17、he requirements of overvoltage protection holders or separable contacts. It also does not cover the requirements of IDCs used in equipment. These are covered by the relevant equipment Recommendation. K.55_F01LinecardMDFNTConnectors in the equipment are covered by the relevant equipment Recommendatio
18、n.Above ground cross connectframeOutdoorcabinet/housing UndergroundjointCustomerequipmentFigure 1/K.55 Example of IDC connectors used in the network 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions o
19、f 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 the Recommendation and o
20、ther references listed below. A list of currently valid ITU-T Recommendations is regularly published. ITU-T Recommendation K.11 (1993), Principles of protection against overvoltages and overcurrents. ITU-T Recommendation K.39 (1996), Risk assessment of damages to telecommunication sites due to light
21、ning discharges. ITU-T Recommendation K.44 (2000), Resistibility of telecommunication equipment exposed to overvoltages and overcurrents Basic Recommendation. ITU-T Recommendation K.46 (2000), Protection of telecommunication lines using metallic symmetric conductors against lightning induced surges.
22、 ITU-T Recommendation K.47 (2000), Protection of telecommunication lines using metallic conductors against direct lightning discharges. 2 ITU-T Rec. K.55 (08/2002) IEC 60352-4 (Ed. 1.0 B) (1994), Solderless connections Part 4: Solderless non-accessible displacement connections General requirements,
23、test methods and practical guidance. IEC 60512-7 (Ed 3.0 B, 8) (1993), Electromechanical components for electronic equipment: basic testing procedures and measuring methods Part 7: Mechanical operating tests and sealing tests. IEC 61643-21 (Ed. 1.0 B) (2000), Low voltage surge protective devices Par
24、t 21: Surge protective devices connected to telecommunications and signalling networks Performance requirements and testing methods. IEC 61663-2 (Ed. 1.0 B) (2001), Lightning protection Telecommunication lines Part 2: Lines using metallic conductors. 3 Definitions and abbreviations The majority of d
25、efinitions, abbreviations and symbols used in this Recommendation are defined in ITU-T Rec. K.44. Unique definitions, abbreviations and symbols used in this Recommendation are defined below. 3.1 Definitions This Recommendation defines the following terms. 3.1.1 insulation displacement connector (IDC
26、)s: An Insulation Displacement Connector (IDC) is an interconnecting or terminating element for symmetric pair conductors where the insulation 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 c
27、onductor or tap from the main conductor. A modular connector, or multi pair connector, is a connector containing more than one termination. Connectors can be either “dry“ or “filled“. A filled connector is filled with a grease or a gel to make it moisture resistant. 3.1.2 insulation resistance: Insu
28、lation resistance is the leakage resistance from one connection point to an adjacent connection point or ground (earth). 3.2 Abbreviations This Recommendation uses the following abbreviations: c ground connection of IDC; earth rail (only applicable to modules with holders) IDC Insulation Displacemen
29、t Connector IR Insulation Resistance xa1, xb2 xbnline side of IDC ya1, yb2 ybncross connect side of IDC 4 Tests 4.1 General test requirements For information on general test conditions refer to IEC 61643-21. Refer to Appendix I for guidance on the type of connector to be used in the intended environ
30、ment. The tests in the appropriate test table shall be performed in sequence. ITU-T Rec. K.55 (08/2002) 3 4.2 Connector preparation The connectors shall be terminated, as per the IDC manufacturers instructions, with conductors with solid insulation. Both the minimum and maximum conductor sizes speci
31、fied for the connector shall be used. Use the minimum conductor size necessary, from the allowable conductor range, to prevent fusion of the conductor for the lightning surge current and power contact tests. Fusing of the conductor is not a connector failure. 4.2.1 2 or 3 wire IDC connectors A minim
32、um of thirty connectors shall be terminated according to Figure A.1. 4.2.2 Multi pair IDC connectors A minimum of six assembled modules shall be terminated according to Figure A.2. Only half the conductors are terminated on the cross connect side for the voltage breakdown test sequence, see Figures
33、B.1, B.2 and B.3. 4.3 High voltage test methods Use one third of the assembled samples for tests 1.1 to 1.4, the second third for tests 2.1 to 2.3 and the rest of the samples for tests 3.1 to 3.3. The assembled connectors shall be tested for their high voltage/current performance in accordance with
34、the tests outlined in Table 1. 4.4 General failure criteria for IDC All assembled connectors shall comply with the test requirements outlined in Table 1. Further, the connector shall not exhibit any of the following modes of failure: flashover to the foil or electrode; expulsion of any terminating p
35、art; internal breakdown (blackening of grease); fusing of the conductor at the conductor/connector interface; physical damage to the connector. 4.5 Failure criteria for IDC for the mains power contact test For test resistor values of 160 or greater the connector should not be damaged, as per the cri
36、teria in 4.4. For test resistor values less than 160 the connector may be damaged, but a fire hazard shall not occur, and the adjacent circuits shall not be damaged. Fusing of the conductor is not a connector failure. 4.6 Ball bearings Ball bearings used as an electrode shall have a diameter of 3.1
37、mm 0.1 mm. 5 Electrical requirements and test procedures Type test requirements: The connectors shall meet the tests outlined in Table 1. Connection details for multi pair connectors are given in Annexes B and C. A special test condition is used to simulate exposure to moist conditions. The detailed
38、 test method is given in Annex D. Acceptance test requirements: These tests are made by agreement between the manufacturer and user. 4 ITU-T Rec. K.55 (08/2002) Table 1/K.55 Requirements and test procedures Test No. Test description Test circuit and waveshape (see Annex A/K.44) Basic test levels(als
39、o see 7/K.44) Enhanced test levels (also see clauses 5 and 7/K.44) No. of tests Acceptance criteria Test method 1.1 Insulation Resistance (Initial) IR Test Instrument Udc= 500 V t = 60 s U = 500 V t = 60 s 1 100 M Prepare the connector as follows: For dry connectors, completely wrap the assembled co
40、nnector in Aluminium foil or place in ball bearings. (Note 2) For filled connectors, place the assembled connectors in an aqueous solution, see Figure D.1. Measure the IR conductor to foil/bearings or electrode at the end of the test period. Where applicable, measure the IR conductor to conductor at
41、 the end of the test period. 1.2 a.c. Voltage Breakdown Test A.3.6/K.44 Frequency = 50 or 60 Hz Ua.c.= 1000 V R = 100k t = 60 s Frequency = 50 or 60 Hz Ua.c.= 3000 V R = 100k t = 60 s 1 No failure as specified in 4.4. Prepare the connector as described for test 1.1. Apply the a.c. voltage between th
42、e conductors tied together and the foil/bearings or electrode. 1.3 Lightning Surge Voltage Test A.3.1/K.44 10/700 s Uc= 4 kV R = 25 Uc= 8 kV R = 25 5 of each polarity No failure as specified in 4.4. Prepare the connector as described for test 1.1. Apply the impulse voltage between the conductors tie
43、d together and the foil/bearings or electrode. 1.4 Insulation Resistance (Final) IR Test Instrument Ud.c.= 500 V t = 60 s Ud.c.= 500 V t = 60 s 1 100 M Repeat test 1.1. 2.1 Connection Resistance Test (Initial) 4 wire resistance measurement instrument 1 25 m The connection resistance shall be measure
44、d for each termination and recorded. 2.2 Lightning Surge Current Test A.3.4/K.44 8/20 s I = 1 kAs R = 0 I = 5 kA R = 0 (Note 1) 5 No failure as specified in 4.4. With the connector insulated the test current is applied through the termination. 5 ITU-T Rec. K.55 (08/2002) Table 1/K.55 Requirements an
45、d test procedures Test No. Test description Test circuit and waveshape (see Annex A/K.44) Basic test levels(also see 7/K.44) Enhanced test levels (also see clauses 5 and 7/K.44) No. of tests Acceptance criteria Test method 2.3 Connection Resistance Test (Final) 4 wire resistance measurement instrume
46、nt 1delta 2.5 m Repeat test 2.1 and compare with the previously recorded result. 3.1 Connection Resistance Test (Initial) 4 wire resistance measurement instrument 1 25 m The connection resistance shall be measured for each termination and recorded. 3.2 Mains power contact Test A.3.6/K.44 Ua.c.= 230
47、V Frequency = 50 or 60 Hz. T = 15 min. R = 10, 20, 40, 80, 160, 300, 600 and 1000 Ua.c.= 230 V Frequency = 50 or 60 Hz. T = 15 min. R = 10, 20, 40, 80, 160, 300, 600 and 1000 (Note 1) 1 Refer to 4.5. With the connector insulated the test current is applied through the termination. 3.3 Connection Res
48、istance Test (Final) 4 wire resistance measurement instrument 1 delta 2.5 m Repeat test 3.1 and compare with the previously recorded result. NOTE 1 Use the minimum size conductor necessary, within the allowable conductor range, for tests 2.2 and 3.2 to prevent the conductor from fusing. NOTE 2 The a
49、luminium foil is used to simulate an adjacent earthed metal surface or bare conductor. If easier, the test may be performed by placing each of the six faces of the connector on a ground plane in turn. 6 ITU-T Rec. K.55 (08/2002) Annex A Dimensioning of terminating wires for all voltage/current tests K.55_FA1(i) For voltage test:A = 250 mmB = 20 mm(ii) For current test:A = 90 mmB = 30 mmA( 1 mm)B ConnectorFigure A.1/K.55 Dimensions of terminating wires for 2 or 3 wire co
