Low-voltage surge protective devices - Part 22: Surge protective devices connected to telecommunications and signalling networks - Selection and application principles

IEC 61643-22:2015 describes the principles for the selection, operation, location and coordination of SPDs connected to telecommunication and signalling networks with nominal system voltages up to 1 000 V r.m.s. a.c. and 1 500 V d.c. This standard also addresses SPDs that incorporate protection for signalling lines and power lines in the same enclosure (so called multiservice SPDs). This second edition cancels and replaces the first edition published in 2004. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Update the use of multiservice SPDs (Article 8);
- Comparison between SPD classification of IEC 61643-11 and IEC 61643-21 (7.3.3);
- Consideration of new transmission systems as PoE (Annex F);
- EMC requirements of SPDs (Annex G);
- Maintenance cycles of SPDs (Annex I). Keywords: SPD, surge protective devices

Parafoudres basse tension - Partie 22: Parafoudres connectés aux réseaux de signaux et de télécommunications - Principes de choix et d'application

L'IEC 61643-22:2015 décrit les principes à utiliser pour le choix, le fonctionnement, la localisation et la coordination des parafoudres connectés aux réseaux de télécommunications et de transmission de signaux sous une tension nominale de réseau jusqu'à 1 000 V en valeur efficace en courant alternatif et 1 500 V en courant continu. La présente norme couvre aussi les parafoudres qui incorporent la protection pour les lignes de transmission de signaux et les lignes de puissance dans la même enveloppe (parafoudres dits parafoudres multifonctions. Cette deuxième édition annule et remplace la première édition parue en 2004. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Mise à jour de l'utilisation des parafoudres multifonction (Article 8);
- Comparaison entre les classifications de parafoudres de l'IEC 61643-11 et de l'IEC 61643-21 (7.3.3);
- Prise en compte des nouveaux systèmes de transmission PoE (Annexe F);
- Exigences de CEM des parafoudres (Annexe G);
- Cycles de maintenance des parafoudres (Annexe I). Mots clès: parafoudres

General Information

Status
Published
Publication Date
24-Jun-2015
Current Stage
PPUB - Publication issued
Start Date
25-Jun-2015
Completion Date
25-Jun-2015
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IEC 61643-22:2015 - Low-voltage surge protective devices - Part 22: Surge protective devices connected to telecommunications and signalling networks - Selection and application principles
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IEC 61643-22
Edition 2.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage surge protective devices –
Part 22: Surge protective devices connected to telecommunications and
signalling networks – Selection and application principles
Parafoudres basse tension –
Partie 22: Parafoudres connectés aux réseaux de signaux et de
télécommunications – Principes de choix et d'application
IEC 61643-22:2015-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61643-22
Edition 2.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage surge protective devices –
Part 22: Surge protective devices connected to telecommunications and
signalling networks – Selection and application principles
Parafoudres basse tension –
Partie 22: Parafoudres connectés aux réseaux de signaux et de
télécommunications – Principes de choix et d'application
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.240.01; 29.240.10 ISBN 978-2-8322-2750-3

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61643-22:2015  IEC 2015
CONTENTS

FOREWORD ......................................................................................................................... 6

INTRODUCTION ................................................................................................................... 8

1 Scope ............................................................................................................................ 9

2 Normative references..................................................................................................... 9

3 Terms, definitions and abbreviations .............................................................................. 9

3.1 Terms and definitions .......................................................................................... 10

3.2 Abbreviations ...................................................................................................... 10

4 Description of technologies .......................................................................................... 10

4.1 General ............................................................................................................... 10

4.2 Voltage-limiting components ................................................................................ 10

4.2.1 General ....................................................................................................... 10

4.2.2 Clamping components .................................................................................. 11

4.2.3 Switching components.................................................................................. 11

4.3 Current-limiting components ................................................................................ 11

4.3.1 General ....................................................................................................... 11

4.3.2 Current-interrupting components .................................................................. 11

4.3.3 Current-reducing components....................................................................... 11

4.3.4 Current-diverting components ....................................................................... 11

5 Parameters for selection of SPDs and appropriate tests from IEC 61643-21 .................. 12

5.1 General ............................................................................................................... 12

5.2 Normal service conditions ................................................................................... 12

5.2.1 General ....................................................................................................... 12

5.2.2 Air pressure and altitude .............................................................................. 12

5.2.3 Ambient temperature .................................................................................... 12

5.2.4 Relative humidity ......................................................................................... 12

5.2.5 Abnormal service conditions ......................................................................... 12

5.3 SPD parameters that may affect normal system operation .................................... 12

6 Risk management ........................................................................................................ 13

6.1 General ............................................................................................................... 13

6.2 Risk analysis ....................................................................................................... 14

6.3 Risk identification ................................................................................................ 14

6.4 Risk treatment ..................................................................................................... 14

7 Application of SPDs ..................................................................................................... 16

7.1 General ............................................................................................................... 16

7.2 Coupling mechanisms ......................................................................................... 16

7.3 Application, selection and installation of surge protective devices (SPDs) ............. 18

7.3.1 Application requirements for SPDs ............................................................... 18

7.3.2 SPD installation cabling considerations ........................................................ 22

7.3.3 Comparison between SPD classification of IEC 61643-11 and

IEC 61643-21 ............................................................................................... 25

8 Multiservice surge protective devices ........................................................................... 25

9 Coordination of SPDs/ITE ............................................................................................ 28

Annex A (informative) Voltage-limiting components ............................................................ 29

A.1 Clamping components ......................................................................................... 29

A.1.1 General ....................................................................................................... 29

A.1.2 Metal oxide varistor (MOV) ........................................................................... 29

---------------------- Page: 4 ----------------------
IEC 61643-22:2015  IEC 2015 – 3 –

A.1.3 Silicon semi-conductors ............................................................................... 29

A.2 Switching components ......................................................................................... 31

A.2.1 General ....................................................................................................... 31

A.2.2 Gas discharge tube (GDT) ............................................................................ 31

A.2.3 Air gaps ....................................................................................................... 31

A.2.4 Thyristor surge suppressor (TSS) – Fixed voltage types (self-gating) ............ 32

A.2.5 Thyristor surge suppressor (TSS) – Gated types ........................................... 32

Annex B (informative) Current-limiting components ............................................................. 33

B.1 General ............................................................................................................... 33

B.2 Non-resetting current limiters .............................................................................. 33

B.2.1 General ....................................................................................................... 33

B.2.2 Series current-interrupting components ........................................................ 33

B.2.3 Shunt current-diverting limiters ..................................................................... 34

B.3 Self-resetting current limiters ............................................................................... 36

B.3.1 General ....................................................................................................... 36

B.3.2 Series current-reducing components ............................................................. 36

B.3.3 Shunt current-diverting components ............................................................. 38

Annex C (informative) Risk management ............................................................................ 39

C.1 Risk due to lightning discharges .......................................................................... 39

C.1.1 Risk assessment .......................................................................................... 39

C.1.2 Risk analysis................................................................................................ 39

C.1.3 Risk treatment ............................................................................................. 41

C.2 Risk due to power line faults ................................................................................ 42

C.2.1 General ....................................................................................................... 42

C.2.2 AC power systems ....................................................................................... 42

C.2.3 DC power systems ....................................................................................... 42

Annex D (informative) Transmission characteristics related to IT systems ........................... 44

D.1 General ............................................................................................................... 44

D.2 Telecommunications systems .............................................................................. 44

D.3 Signalling, measurement and control systems ...................................................... 45

D.4 Cable TV systems ............................................................................................... 45

Annex E (informative) Coordination of SPDs/ITE ................................................................ 46

E.1 General ............................................................................................................... 46

E.2 Determination of U and I ............................................................................... 46

IN IN

E.3 Determine the output protective voltage and current waveforms for SPD1 ............ 47

E.4 Compare SPD1 and SPD2 values ........................................................................ 47

E.5 Necessity of verification of the coordination by testing ......................................... 48

Annex F (informative) Protection of Ethernet systems ......................................................... 49

F.1 Power over Ethernet (PoE) .................................................................................. 49

F.2 Withstand capabilities and SPD coordination ....................................................... 50

F.3 Common mode to differential mode surge conversion by switching devices .......... 50

F.3.1 General ....................................................................................................... 50

F.3.2 Differential mode voltage reduction by inter-wire protection ........................... 51

F.3.3 Differential mode voltage reduction by single switching element .................... 52

Annex G (informative) EMC impact of SPDs ....................................................................... 54

G.1 General ............................................................................................................... 54

G.2 Electromagnetic immunity .................................................................................... 54

G.3 Electromagnetic emission .................................................................................... 54

---------------------- Page: 5 ----------------------
– 4 – IEC 61643-22:2015  IEC 2015

Annex H (informative) Definition of internal port (Source: ITU-T K.44) ................................. 55

Annex I (informative) Maintenance of SPDs for Information Technology .............................. 56

I.1 General requirements .......................................................................................... 56

I.2 Maintenance responsibilities ................................................................................ 56

I.3 Maintenance of SPDs .......................................................................................... 56

I.3.1 General ....................................................................................................... 56

I.3.2 Visual inspection .......................................................................................... 57

I.3.3 Complete inspection ..................................................................................... 57

I.3.4 Examining periods ....................................................................................... 57

Annex J (informative) Earth potential rise (EPR) ................................................................. 59

J.1 General ............................................................................................................... 59

J.2 Causes of EPR ................................................................................................... 59

J.3 Influence of soil resistivity ................................................................................... 59

J.4 Fibre optics ......................................................................................................... 59

Annex K (informative) References and examples of risk management based on

IEC 62305-2 ................................................................................................................ 60

Bibliography ....................................................................................................................... 61

Figure 1 – SPD installation in telecommunications and signalling networks .......................... 15

Figure 2 – Measurement and Control network (MCR) ........................................................... 15

Figure 3 – Coupling mechanisms ........................................................................................ 17

Figure 4 – Example of a configuration of the lightning protection concept ............................. 19

Figure 5 – Example of a configuration according to the zones (Figure 4) .............................. 20

Figure 6 – Example of protection measures against common-mode voltages and

differential mode voltages of the data (f) and supply voltage input (g) of an ITE ................... 21

Figure 7 – Influence of voltages U and U on protection level U caused by
L1 L2 P

inductance of the leads ....................................................................................................... 22

Figure 8 – Removal of the voltages U and U from the protector unit by connecting
L1 L2

leads to a common point ..................................................................................................... 23

Figure 9 – Necessary installation conditions of a three, five or multi-terminal SPD with

an ITE for minimizing the interference influences on the protection level .............................. 24

Figure 10 – Individual SPDs ................................................................................................ 26

Figure 11 – MSPD with PE connection option ...................................................................... 26

Figure 12 – MSPD with transient bonding SPCs to PE terminals .......................................... 27

Figure 13 – Coordination of two SPDs ................................................................................. 28

Figure A.1 – Behaviour of clamping components ................................................................. 29

Figure A.2 – Behaviour of switching components ................................................................. 31

Figure B.1 – Behaviour of current interrupting components .................................................. 33

Figure B.2 – Behaviour of current-diverting component ........................................................ 34

Figure B.3 – Thermally operated (heat coil) three-terminal shunt current limiter .................... 35

Figure B.4 – Behaviour of current-reducing components (thermally operated type) ............... 36

Figure B.5 – Thermally operated (PTC thermistor) two-terminal series current limiting

component .......................................................................................................................... 37

Figure B.6 – Two-terminal series electronic current limiting component ................................ 38

Figure B.7 – Electronic (gated bidirectional thyristor) three-terminal shunt current

limiting component .............................................................................................................. 38

Figure C.1 – Risk evaluation procedure ............................................................................... 41

---------------------- Page: 6 ----------------------
IEC 61643-22:2015  IEC 2015 – 5 –

Figure E.1 – Coordination verification process ..................................................................... 47

Figure F.1 – PoE powering modes ....................................................................................... 49

Figure F.2 – Common mode to differential mode surge conversion by asynchronous

SPD operation .................................................................................................................... 50

Figure F.3 – Differential surge generated by asynchronous SPD operation on a

longitudinal surge ............................................................................................................... 51

Figure F.4 – SPD circuit with inter-wire protection to limit the differential surge .................... 51

Figure F.5 – Differential surge voltage limited by inter-wire protection .................................. 52

Figure F.6 – SPD using a single switching element and a steering diode bridge ................... 52

Figure F.7 – Differential surge voltage reduced by single switching element and

steering diode bridge .......................................................................................................... 53

Table 1 – Responsibility for managing the protective measures ............................................ 14

Table 2 – Coupling mechanisms .......................................................................................... 18

Table 3 – Selection aid for rating SPDs for the use in (zone) interfaces according to

IEC 62305-1 ....................................................................................................................... 20

Table 4 – Relationship between SPD classification of IEC 61643-21 and IEC 61643-11 ........ 25

Table 5 – Relationship between LPZ and the requested test categories of MSPDs ............... 27

Table C.1 – AC overhead power systems ............................................................................ 42

Table C.2 – AC underground electric cables ........................................................................ 42

Table C.3 – DC overhead power systems ............................................................................ 43

Table C.4 – DC underground electric cables ........................................................................ 43

Table D.1 – Transmission characteristics for telecommunications systems in access

networks ............................................................................................................................. 44

Table D.2 – Transmission characteristics of IT systems in customer premises ...................... 45

Table D.3 – Transmission characteristics of cable TV systems ............................................. 45

Table F.1 – Comparison of Type 1 (PoE) and Type 2 PoE+) powering values ....................... 49

Table I.1 – Maximum period between inspections of lightning protective measures

covered by IEC 62305-3 ...................................................................................................... 57

Table I.2 – Maximum period between inspections of lightning protective measures

covered by ITU-T K.69 [28] ................................................................................................. 58

---------------------- Page: 7 ----------------------
– 6 – IEC 61643-22:2015  IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
LOW-VOLTAGE SURGE PROTECTIVE DEVICES –
Part 22: Surge protective devices connected to
telecommunications and signalling networks –
Selection and application principles
FOREWORD

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