ITU-T K 126-2017 Surge protective component application guide C High frequency signal isolation transformers (Study Group 5).pdf
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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.126 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (07/2017) SERIES K: PROTECTION AGAINST INTERFERENCE Surge protective component application guide High frequency signal isolation transformers Recommendation ITU-T K.126
2、Rec. ITU-T K.126 (07/2017) i Recommendation ITU-T K.126 Surge protective component application guide High frequency signal isolation transformers Summary Failures of Ethernet local area network (LAN) ports have been attributed to the use of inappropriate surge protective devices (SPDs), lack of insu
3、lation coordination and inappropriate wiring, which causes the failure of transformers, associated wiring, components and connectors. Recommendation ITU-T K.126 discusses isolation transformer parameters and how they influence the equipment common-mode and differential-mode surge performance. Access
4、 to the full text of Recommendation ITU-T K.95 is necessary to fully understand this Recommendation. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T K.126 2017-07-29 5 11.1002/1000/13280 Keywords Characteristics, common-mode surge, differential-mode surge, Ethernet, high fre
5、quency, isolation transformer, power over Ethernet, PoE, ratings, surge protective device, SPD. * 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.int/11.1002/1000/11830
6、-en. ii Rec. ITU-T K.126 (07/2017) 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 permanent organ of
7、 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, establishes the topic
8、s 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 standards are prepa
9、red 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 Recommendation may
10、 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 equivalents are used to ex
11、press 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 claimed Intellectual Pro
12、perty 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 not received notice o
13、f 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/ITU-T/ipr/. ITU 2017
14、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.126 (07/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recomme
15、ndation . 2 4 Abbreviations and acronyms 3 5 Conventions 3 6 Component construction . 4 6.1 Transformer basics . 4 6.2 Transformer parasitics 4 6.3 Transformer core saturation . 5 6.4 High frequency signal transformers . 6 7 Characteristics . 8 7.1 Measurement 8 7.2 Inter-winding capacitance 8 7.3 I
16、nsulation resistance . 9 7.4 Core saturation voltagetime value 10 7.5 Winding resistance . 11 7.6 Saturated core secondary winding inductance . 11 8 Ratings 12 8.1 Verification . 12 8.2 Rated impulse voltage 12 8.3 Rated winding d.c. 13 9 Application examples . 14 9.1 Transformer example 14 9.2 Comm
17、on-mode surge . 14 9.3 DC insulation resistance . 17 9.4 Differential-mode primary winding surge 18 9.5 Rated impulse voltage 23 9.6 Rated winding d.c. 24 Annex A Use of isolating transformers for a.c. power and signal applications 25 A.1 Application of LITs to equipment that requires isolation 25 A
18、.2 Application of LITs on communication line for high-speed signal transmission 25 A.3 LITs for equipment with low resistibility . 26 Bibliography. 27 Rec. ITU-T K.126 (07/2017) 1 Recommendation ITU-T K.126 Surge protective component application guide High frequency signal isolation transformers 1 S
19、cope The b-ITU-T K.96 application overview guide and other ITU-T component specific guide Recommendations cover surge protective components (SPCs) used in power and telecom surge protective devices (SPDs) and equipment ports. This application guide on high frequency signal isolation transformer tech
20、nology SPCs covers: component construction; characteristics; ratings; application examples. 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 ed
21、itions 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 Recommendations and other references listed below. A list of the currently va
22、lid 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.95 Recommendation ITU-T K.95 (2016), Surge parameters of isolating transformers used in telecommunication devi
23、ces and equipment. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 clearance b-IEC/TR 60664-2-1: Shortest distance in air between two conductive parts. 3.1.2 common-mode surge ITU-T K.95: Surge appearing equally on all conductors of a g
24、roup at a given location. NOTE 1 The reference point for common-mode surge voltage measurement can be a chassis terminal, or a local earth/ground point. NOTE 2 Also known as longitudinal surge or asymmetrical surge. 3.1.3 creepage distance b-IEC/TR 60664-2-1: Shortest distance along the surface of a
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