Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)

IEC 61643-352:2018 covers the application of surge isolation transformers (SITs) that are used in telecommunication transformer applications with signal levels up to 400 V peak to peak. These transformers have a high rated impulse voltage with or without screen between the input and output windings. SITs are components for surge protection and are used to mitigate the onward propagation of common-mode voltage surges. This document describes SITs' selection, application principles and related information. This document does not cover power line communication transformers.

Composants pour protection par parafoudres basse tension - Partie 352: Principes de choix et d'application pour les transformateurs d'isolement contre les surtensions (SIT) dans les réseaux de signalisation et de télécommunications

IEC 61643-352:2018 trait à l'application des transformateurs d'isolement contre les surtensions (SIT) utilisés dans des applications de transformateur de télécommunication dont les niveaux de signal atteignent 400 V de crête à crête. Ces transformateurs ont une tension assignée de tenue aux chocs élevée, avec ou sans blindage entre les enroulements d'entrée et de sortie. Les SIT sont des composants de protection contre les surtensions; ils sont utilisés pour atténuer la propagation de surtensions en mode commun. Le présent document traite du choix des SIT, de leurs principes d'application et des informations les concernant. Le présent document ne couvre pas les transformateurs de communication sur ligne d'alimentation.
Mots clés: transformateurs d'isolement contre les surtensions (SIT), applications de transformateur de télécommunication

General Information

Status
Published
Publication Date
09-Jan-2018
Current Stage
PPUB - Publication issued
Start Date
26-Jan-2018
Completion Date
10-Jan-2018
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IEC 61643-352:2018 - Components for low-voltage surge protection - Part 352: Selection and application principles for telecommunications and signalling network surge isolation transformers (SITs)
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IEC 61643-352 ®
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Components for low-voltage surge protection –
Part 352: Selection and application principles for telecommunications and
signalling network surge isolation transformers (SITs)

Composants pour protection par parafoudres basse tension –
Partie 352: Principes de choix et d'application pour les transformateurs
d'isolement contre les surtensions (SIT) dans les réseaux de signalisation et de
télécommunications
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IEC 61643-352 ®
Edition 1.0 2018-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Components for low-voltage surge protection –

Part 352: Selection and application principles for telecommunications and

signalling network surge isolation transformers (SITs)

Composants pour protection par parafoudres basse tension –

Partie 352: Principes de choix et d'application pour les transformateurs

d'isolement contre les surtensions (SIT) dans les réseaux de signalisation et de

télécommunications
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.040.99 ISBN 978-2-8322-5225-3

– 2 – IEC 61643-352:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms, definitions, symbols and abbreviated terms . 7
3.1 Terms and definitions . 7
3.2 Symbols . 8
3.3 Abbreviated terms . 9
4 Service conditions . 10
4.1 Temperature range . 10
4.2 Humidity . 10
4.3 Altitude . 10
4.4 Microclimate . 10
5 SIT surge conditions . 11
5.1 SIT surge mitigation . 11
5.2 Common-mode surges . 12
5.3 Differential-mode surges . 13
5.3.1 General . 13
5.3.2 Ethernet transformer differential surge action . 13
6 Selection . 13
6.1 General . 13
6.2 Impulse withstand voltage . 13
6.3 Rated values of SIT . 14
7 Applications . 14
7.1 General . 14
7.2 Example of surge protection using SITs with ES for control and terminal
equipment installed in two different buildings respectively . 14
7.3 Example of surge protection using SITs for telecommunication equipment in
substation . 14
7.4 Example of surge protection using SITs for transmission and switching
equipment installed in different floors in a communication building . 16
7.5 Example of surge protection using SITs for computer network equipment in a
data centre . 17
7.6 Example of surge protection using SITs for a Power over Ethernet (PoE)
system . 17
7.7 Example of surge protection using SITs for LAN . 18
Annex A (informative) Lightning overvoltages of telecommunication line . 19
Bibliography . 20

Figure 1 – Symbol for a two-winding SIT . 8
Figure 2 – Symbol for a two-winding SIT with polarity indication . 9
Figure 3 – Symbol for a two-winding SIT with electric screen . 9
Figure 4 – SIT with centre tapped windings . 9
Figure 5 – Common-mode surge conditions for SIT . 11
Figure 6 – Common-mode surge conditions for SIT with an electric screen . 12
Figure 7 – Transformer differential surge truncation . 13

Figure 8 – Example of surge protection using SITs in order to isolate two different
buildings . 14
Figure 9 – Example of surge protection using SITs in substation . 15
Figure 10 – Example of surge protection using SITs in a communication building . 16
Figure 11 – Example of surge protection using SITs in a data centre . 17
Figure 12 – Example of surge protection using SITs for a Power over Ethernet (PoE)
system . 17
Figure 13 – Example of surge protection using SITs for LAN . 18
Figure A.1 – Lightning overvoltages of telecommunication line. 19

Table 1 – List of abbreviated terms used in this document . 10
Table 2 – Classification of microclimate condition . 10

– 4 – IEC 61643-352:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COMPONENTS FOR LOW-VOLTAGE SURGE PROTECTION –

Part 352: Selection and application principles for telecommunications and
signalling network surge isolation transformers (SITs)

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and no
...

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