Low-voltage surge protective devices - Part 12: Surge protective devices connected to low-voltage power distribution systems - Selection and application principles

IEC 61643-12:2008 describes the principles for selection, operation, location and coordination of SPDs to be connected to 50 Hz to 60 Hz a.c. and to d.c. power circuits and equipment rated up to 1 000 V r.m.s. or 1 500 V d.c. Specific change with respect to the previous edition is the incorporation of Amendment 1, which was not published separately due to the number of changes and pages.

Überspannungsschutzgeräte für Niederspannung - Teil 12: Überspannungsschutzgeräte für den Einsatz in Niederspannungsanlagen - Auswahl und Anwendungsgrundsätze

Parafoudres basse tension - Partie 12: Parafoudres connectés aux réseaux de distribution basse tension - Principes de choix et d'application

La CEI 61643-12:2008 décrit les principes relatifs au choix, à la mise en uvre, à l'emplacement et à la coordination des parafoudres à connecter sur des circuits de puissance 50 Hz à 60 Hz en courant alternatif et des circuits en courant continu, et des matériels de puissance allant jusqu'à 1 000 V en valeur efficace ou 1 500 V en courant continu. Le changement spécifique par rapport à l'édition précédente est l'intégration de l'Amendement 1, qui n'a pas été publié séparément en raison du nombre important de modifications et de pages.

Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 12. del: Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme - Izbira in načela za uporabo (IEC 61643-12:2008, spremenjen)

Ta del IEC 61643 opisuje načela za izbiro, delovanje, lokacijo in koordinacijo naprav za zaščito pred prenapetostnimi udari, povezanih z enosmernimi in izmeničnimi tokokrogi s 50 do 60 Hz ter opremo, ki ustreza do 1.000 V RMS ali 1.500 V enosmernega toka.

General Information

Status
Published
Publication Date
22-Dec-2009
Current Stage
6060 - Document made available
Due Date
23-Dec-2009
Completion Date
23-Dec-2009

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SLOVENSKI STANDARD
SIST-TS CLC/TS 61643-12:2010
01-april-2010
1DGRPHãþD
SIST-TS CLC/TS 61643-12:2007
1L]NRQDSHWRVWQHQDSUDYH]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDULGHO1DSUDYH
]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDUL]DQL]NRQDSHWRVWQHQDSDMDOQHVLVWHPH
,]ELUDLQQDþHOD]DXSRUDER ,(&VSUHPHQMHQ

Low-voltage surge protective devices -- Part 12: Surge protective devices connected to

low-voltage power distribution systems - Selection and application principles

Überspannungsschutzgeräte für Niederspannung - Teil 12: Überspannungsschutzgeräte

für den Einsatz in Niederspannungsanlagen - Auswahl und Anwendungsgrundsätze
Parafoudres basse tension -- Partie 12: Parafoudres connectés aux réseaux de
distribution basse tension - Principes de choix et d'application
Ta slovenski standard je istoveten z: CLC/TS 61643-12:2009
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
SIST-TS CLC/TS 61643-12:2010 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CLC/TS 61643-12:2010
---------------------- Page: 2 ----------------------
SIST-TS CLC/TS 61643-12:2010
TECHNICAL SPECIFICATION
CLC/TS 61643-12
SPÉCIFICATION TECHNIQUE
December 2009
TECHNISCHE SPEZIFIKATION
ICS 29.240; 29.240.10 Supersedes CLC/TS 61643-12:2006
English version
Low-voltage surge protective devices -
Part 12: Surge protective devices connected to low-voltage power
distribution systems -
Selection and application principles
(IEC 61643-12:2008, modified)
Parafoudres basse tension - Überspannungsschutzgeräte
Partie 12: Parafoudres connectés für Niederspannung -
aux réseaux de distribution basse tension - Teil 12: Überspannungsschutzgeräte
Principes de choix et d'application für den Einsatz
(CEI 61643-12:2008, modifiée) in Niederspannungsanlagen -
Auswahl und Anwendungsgrundsätze
(IEC 61643-12:2008, modifiziert)
This Technical Specification was approved by CENELEC on 2009-10-30.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to

make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting

national standards in force.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. CLC/TS 61643-12:2009 E
---------------------- Page: 3 ----------------------
SIST-TS CLC/TS 61643-12:2010
CLC/TS 61643-12:2009 – 2 –
Foreword

This Technical Specification consists of the text of the International Standard IEC 61643-12:2008

prepared by SC 37A, Low-voltage surge protective devices, of IEC TC 37, Surge arresters, together

with the common modifications prepared by the Technical Committee CENELEC TC 37A, Low voltage

surge protective devices.

The text of the draft was circulated for voting in accordance with the Internal Regulations, Part 2,

Subclause 11.3.3.3 and was accepted by CENELEC as CLC/TS 61643-12 on 2009-10-30.
This Technical Specification supersedes CLC/TS 61643-12:2006.
The following date was fixed:
– latest date by which the existence of the CLC/TS
has to be announced at national level (doa) 2010-04-30
This Technical Specification is to be used in conjunction with EN 61643-11:2002.
__________
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SIST-TS CLC/TS 61643-12:2010
– 3 – CLC/TS 61643-12:2009
Contents

0 Introduction ........................................................................................................................................6

0.1 General ...................................................................................................................................6

0.2 Keys to understanding the structure of this Technical Specification ......................................6

1 Scope ................................................................................................................................................8

2 Normative references ........................................................................................................................8

3 Terms, definitions and abbreviated terms .........................................................................................9

3.1 Terms and definitions ..............................................................................................................9

3.2 List of variables and abbreviations used in this Technical Specification ............................. 14

4 Systems and equipment to be protected ........................................................................................ 15

4.1 Low-voltage power distribution systems .............................................................................. 15

4.2 Characteristics of the equipment to be protected ................................................................ 18

5 Surge protective devices ................................................................................................................ 19

5.1 Basic functions of SPDs ....................................................................................................... 19

5.2 Additional requirements ....................................................................................................... 19

5.3 Classification of SPDs .......................................................................................................... 19

5.4 Characteristics of SPDs ....................................................................................................... 21

5.5 Additional information on characteristics of SPDs ............................................................... 22

6 Application of SPDs in low-voltage power distribution systems ..................................................... 27

6.1 Installation and its effect on the protection given by SPDs .................................................. 27

6.2 Selection of SPD .................................................................................................................. 35

6.3 Characteristics of auxiliary devices ...................................................................................... 43

7 Risk analysis................................................................................................................................... 43

8 Co-ordination where equipment has both signalling and power terminals .................................... 44

Annex A (informative) Examples of various SPD technologies ............................................................ 45

A.1 Examples of internal circuits for one port and two port SPDs ............................................. 45

A.2 Response of SPDs to a combination wave impulse ............................................................ 47

Annex B (informative) Explanation of testing procedures used in EN 61643-11 ................................. 48

B.1 Determination of U for SPDs tested in accordance with class I and class II tests ........... 48

res

B.2 Impulse waveshape for assessment of U ......................................................................... 48

res

B.3 Influence of a back filter on determination of U ................................................................ 48

res

B.4 Operating duty test for SPDs ............................................................................................... 49

B.5 TOV failure test .................................................................................................................... 50

B.6 Differences in the testing conditions of Type 1 (test class I), 2 (test class II) and

3 (tests class III) SPDs ......................................................................................................... 50

B.7 Short-circuit withstand capability test in conjunction with overcurrent protection

(if any) .................................................................................................................................. 51

Annex C (informative) Partial lightning current calculations ................................................................. 52

Annex D (informative) Examples of application of CLC/TS 61643-12 ................................................. 54

D.1 Domestic application ............................................................................................................ 54

D.2 Industrial application ............................................................................................................ 55

D.3 Presence of a lightning protection system ........................................................................... 60

Annex E (informative) Examples of application of the risk analysis ..................................................... 61

Annex F (informative) Consideration for SPDs when Type 1 SPDs are to be applied ........................ 65

Annex G (informative) Immunity versus insulation withstand ............................................................... 67

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SIST-TS CLC/TS 61643-12:2010
CLC/TS 61643-12:2009 – 4 –

Annex H (informative) Examples of SPD installation in power distribution boards in some

countries ......................................................................................................................................... 69

Annex I (informative) Short circuit backup protection and surge withstand ......................................... 72

I.1 Introduction .......................................................................................................................... 72

I.2 Information single shot 8/20 and 10/350 fuses withstand. ................................................... 72

I.3 Fuse influencing factors (reduction) for preconditioning and operating duty test ................ 73

I.4 Specific examples with estimated range of factors for reduction of single shot fuse

withstand. ............................................................................................................................. 73

Annex J (informative) SPD coordination test principles ....................................................................... 75

J.1 Introduction .......................................................................................................................... 75

J.2 Coordination criteria ............................................................................................................. 75

J.3 Coordination techniques ...................................................................................................... 75

J.4 Coordination test .................................................................................................................. 76

Annex K (informative) Simple calculation of I for a Type 1 SPD in case of a building

imp

protected by a LPS ......................................................................................................................... 79

Bibliography ........................................................................................................................................... 81

Figures

Figure 1 – Examples of components and combinations of components ............................................... 20

Figure 2 – Relationship between U , U , U and U ............................................................................. 22

p 0 c cs

Figure 3 – Typical curve of U versus I for ZnO varistors .................................................................... 25

res

Figure 4 – Typical curve for a spark gap ............................................................................................... 25

Figure 5 – Flowchart for SPD application .............................................................................................. 27

Figure 6 – Connection Type 1 ............................................................................................................... 29

Figure 7 – Connection Type 2 ............................................................................................................... 30

Figure 8 – Influence of SPD connecting lead lengths ........................................................................... 33

Figure 9 – Need for additional protection .............................................................................................. 34

Figure 10 – Flowchart for the selection of an SPD ................................................................................ 35

Figure 11 – Typical use of two SPDs – Electrical drawing .................................................................... 41

Figure A.1 – Examples of one-port SPDs ............................................................................................. 45

Figure A.2 – Examples of two-port SPDs .............................................................................................. 46

Figure A.3 – Response of one-port and two-port SPDs to a combination wave impulse ..................... 47

Figure B.1 – Test setting ....................................................................................................................... 50

Figure C.1 – Simple calculation of the sum of partial lightning currents into the power

distribution system ................................................................................................................................. 52

Figure D.1 – Domestic installation ......................................................................................................... 55

Figure D.2 – Industrial installation ......................................................................................................... 58

Figure D.3 – Industrial installation circuitry ............................................................................................ 59

Figure D.4 – Example for a lightning protection system ........................................................................ 60

Figure E.1 – HV and LV overhead lines ................................................................................................ 62

Figure E.2 – HV overhead line and buried LV lines .............................................................................. 63

Figure E.3 – HV and LV buried lines ..................................................................................................... 63

Figure E.4 – HV line overhead .............................................................................................................. 63

Figure F.1 – General distribution of lightning current ............................................................................ 66

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SIST-TS CLC/TS 61643-12:2010
– 5 – CLC/TS 61643-12:2009

Figure H.1 – Wiring diagram of an SPD connected on the load side of the main incoming

isolator via a separate isolator (which could be included in SPD enclosure) ........................................ 69

Figure H.2 – SPD connected to the nearest available outgoing way (MCB) to the incoming

supply (TNS installation typically seen in the UK) ................................................................................. 70

Figure H.3 – Single line-wiring diagram of an SPD connected in shunt on the first outgoing way

of the distribution panel via a fuse (or MCB) ......................................................................................... 71

Figure J.1 – SPDs arrangement for the coordination test ..................................................................... 77

Tables

Table 1 – Maximum TOV values as given in IEC 60364-4-44 .............................................................. 18

Table 2 – Preferred values of I .......................................................................................................... 24

imp

Table 3 – Possible modes of protection for various LV systems........................................................... 31

Table 4 – Minimum required U of the SPD dependent on supply system configuration...................... 36

Table 5 – Typical TOV test values ........................................................................................................ 37

Table I.1 – Examples of ratio between single shot withstand and full preconditioning/operating

duty test ................................................................................................................................................. 74

Table J.1 – Test procedure for coordination .......................................................................................... 78

Table K.1 – Determination of the value of I on the AC side of PV generators .................................. 80

imp
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SIST-TS CLC/TS 61643-12:2010
CLC/TS 61643-12:2009 – 6 –
0 Introduction
0.1 General
This Technical Specification is to be used with EN 61643-11:2002.

Surge protective devices (SPDs) are used to protect, under specified conditions, electrical systems

and equipment against various overvoltages and impulse currents, such as lightning and switching

surges.

SPDs shall be selected in accordance with their environmental conditions and the acceptable failure

rate of the equipment and the SPDs.
This Technical Specification provides information :
• to the user about characteristics useful for the selection of an SPD.

• to evaluate, with reference to EN 62305-1 to EN 62305-4 and HD 384/60364 series, the need for

using SPDs in low-voltage systems.

• on selection and co-ordination of SPDs, while taking into account the entire environment in which

they are applied. Some examples are: equipment to be protected and system characteristics,

insulation levels, overvoltages, method of installation, location of SPDs, co-ordination of SPDs,

failure mode of SPDs and equipment failure consequences.
• and provides guidance to perform a risk analysis.

The HD 384/60364 series of harmonised documents provides direct information for contractors on the

installation of SPDs.

For the purpose of having a usable and complete working document, parts from existing documents

have been duplicated where necessary. Such parts are explicitly mentioned in the text and attention is

drawn to the reader that these parts may change in future.
0.2 Keys to understanding the structure of this Technical Specification

The list below summarizes the structure of this Technical Specification and provides a summary of the

information covered in each clause and annex. The main clauses provide basic information on the

factors used for SPD selection. Readers who wish to obtain more detail on the information provided in

Clauses 4 to 7 should refer to the relevant annexes.
Clause 1 describes the scope of this Technical Specification.

Clause 2 lists the normative references where additional information may be found.

Clause 3 provides definitions useful for the comprehension of this Technical Specification.

Clause 4 addresses the parameters of systems and equipment relevant to SPDs. In addition to the

stresses created by lightning, those created by the network itself as temporary overvoltages and

switching surges are described.

Clause 5 lists the electrical parameters used in the selection of an SPD and gives some explanation

regarding these parameters. These are related to the data given in EN 61643-11.
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SIST-TS CLC/TS 61643-12:2010
– 7 – CLC/TS 61643-12:2009

Clause 6 is the core of this Technical Specification. It relates the stresses coming from the network (as

discussed in Clause 4) to the characteristics of the SPD (as discussed in Clause 5). It outlines how the

protection given by SPDs may be affected by its installation. The different steps for the selection of an

SPD are presented including the problems of co-ordination when more than one SPD is used in an

installation (details about co-ordination may be found in Annex F).

Clause 7 is an introduction to the risk analysis (considerations of when the use of SPDs is beneficial).

Clause 8 deals with co-ordination between signalling and power lines (under consideration).

Annex A gives examples of various SPD technologies.
Annex B deals with explanations of testing procedures used in EN 61643-11.

Annex C deals with the calculation of the sharing of lightning current between different earthing

systems.
Annex D provides specific examples on the use of this Technical Specification.
Annex E provides specific examples of the use of the risk analysis.
Annex F deals with consideration when Type 1 SPDs are to be applied.

Annex G discusses differences between immunity level and insulation withstand of equipments.

Annex H provides practical examples of SPD installation as used in some countries.

Annex I deals with surge withstand of fuses.
Annex J provides SPD coordination tests principles.

Annex K provides simple calculation of I for Type 1 SPDs in case of a building protected by a LPS.

imp
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SIST-TS CLC/TS 61643-12:2010
CLC/TS 61643-12:2009 – 8 –
1 Scope

This Technical Specification describes the principles for selection, operation, location and

co-ordination of SPDs to be connected to 50 Hz to 60 Hz a.c. power circuits and equipment rated up

to 1 000 V r.m.s..

NOTE 1 This Technical Specification deals only with SPDs and not with SPDs components integrated inside equipment.

NOTE 2 Additional requirements may be necessary for special applications such as electrical traction, etc.

NOTE 3 It should be remembered that IEC 60364 series and EN 62305-4 are also applicable.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced

document (including any amendments) applies.

HD 384/60364 series, Electrical installations of buildings/Low-voltage electrical installations

(IEC 60364 series, mod.)

HD 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety – Protection

against electric shock (IEC 60364-4-41, mod.)

HD 60364-4-443:2006, Electrical installations of buildings – Part 4-44: Protection for safety –

Protection against voltage disturbances and electromagnetic disturbances – Clause 443: Protection

against overvoltages of atmospheric origin or due to switching (IEC 60364-4-44:2001/A1:2003, mod.)

HD 60364-5-534:2008, Low-voltage electrical installations – Part 5-53: Selection and erection of

electrical equipment – Isolation, switching and control – Clause 534: Devices for protection against

overvoltages (IEC 60364-5-53:2001/A1:2002 (Clause 534), mod.)
EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)

EN 60664-1, Insulation coordination for equipment within low-voltage systems – Part 1: Principles,

requirements and tests (IEC 60664-1)

EN 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement

techniques – Surge immunity test (IEC 61000-4-5)

EN 61008-1, Residual current operated circuit-breakers without integral overcurrent protection for

household and similar uses (RCCB's) – Part 1: General rules (IEC 61008-1, mod.)

EN 61009-1, Residual current operated circuit-breakers with integral overcurrent protection for

household and similar uses (RCBO's) – Part 1: General rules (IEC 61009-1, mod.)

EN 61643-11:2002 + A11:2007, Low-voltage surge protective devices – Part 11: Surge protective

devices connected to low-voltage power systems – Requirements and tests (IEC 61643-1:1998, mod.

+ corrigendum Dec. 1998, mod.)

EN 62305-1:2006, Protection against lightning – Part 1: General principles (IEC 62305-1:2006)

EN 62305-2, Protection against lightning – Part 2: Risk management (IEC 62305-2)

EN 62305-3, Protection against lightning – Part 3: Physical damage to structures and life hazard

(IEC 62305-3, mod.)

EN 62305-4, Protection against lightning – Part 4: Electrical and electronic systems within structures

(IEC 62305-4)
---------------------- Page: 10 ----------------------
SIST-TS CLC/TS 61643-12:2010
– 9 – CLC/TS 61643-12:2009
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

NOTE These definitions are for the most part reproduced from EN 61643-11 (the definition number being indicated within

square brackets). Where necessary a note has been added for better understanding regarding application of SPDs.

3.1
surge protective device
SPD

device that is intended to limit transient overvoltages and divert surge currents. It contains at least one

non-linear component
[EN 61643-11:2002, Definition 3.1]
3.2
continuous operating current

current flowing through each mode of protection of the SPD when energized at the maximum

continuous operating voltage (U ) for each mode
3.3
maximum continuous operating voltage

maximum r.m.s. voltage which may be continuously applied to the SPD's mode of protection. This is

equal to the rated voltage
[EN 61643-11:2002, Definition 3.11]
3.4
voltage protection level

parameter that characterizes the performance of the SPD in limiting the voltage across its terminals,

which is selected from a list of preferred values. This value is greater than the highest value of the

measured limiting voltages
[EN 61643-11:2002, Definition 3.15]
3.5
measured limiting voltage

maximum magnitude of voltage that is measured across the terminals of the SPD during the

application of impulses of specified waveshape and amplitude
[EN 61643-11:2002, Definition 3.16]
3.6
residual voltage
res

peak value of voltage that appears between the terminals of an SPD due to the passage of discharge

current
[EN 61643-11:2002, Definition 3.17]
---------------------- Page: 11 ----------------------
SIST-TS CLC/TS 61643-12:2010
CLC/TS 61643-12:2009 – 10 –
3.7
temporary overvoltage test value

test voltage applied for a specific duration, to the SPD to simulate the stress under TOV conditions

NOTE 1 Adapted from EN 61643-11:2002, Definition 3.18, by adding the following note.

NOTE 2 It is a characteristic declared by the manufacturer that gives information about the behaviour of the SPD when

stressed with voltages U above U for a given specific duration t (this behaviour may either be no change in the performance

T c T

after application of the temporary overvoltage or a defined failure without hazard for either personnel, equipment or facility).

3.8
temporary overvoltage of the network
TOV

power frequency overvoltage occurring on the network at a given location, of relatively long duration.

TOVs may be caused by faults inside the LV system (U ) or inside the HV system (U )

TOV,LV TOV,HV

NOTE Temporary overvoltages, typically lasting up to several seconds, usually originate from switching operations or faults

(for example, sudden load rejection, single-phase faults, etc.) and/or from non-linearity (ferroresonance effects, harmonics, etc.).

3.9
nominal discharge current

crest value of the current through the SPD having a current waveshape of 8/20. This is used for the

classification of the SPD for class II test and also for preconditioning of the SPD for class I and II tests

[EN 61643-11:2002, Definition 3.8]
3.10
impulse current
imp

it is defined by three parameters, a current peak value I , a charge Q and a specific energy W/R.

peak

Tested in accordance with the test sequence of the operating duty test. This is used for the

classification of the SPD for class I test
[EN 61643-11:2002, Definition 3.9]
3.11
thermal runaway

operational condition when the sustained power dissipation of an SPD exceeds the thermal dissipation

capability of the housing and connections, leading to a cumulative increase in the temperature of the

internal elements culminating in failure
[EN 61643-11:2002, Definition 3.25]
3.12
thermal stability

an SPD is thermally stable if after the operating duty test causing temperature rise, the temperature of

the SPD decreases with time when the SPD is energized at specified maximum continuous operating

voltage and at specified ambient temperature conditions
[EN 61643-11:2002, Definition 3.26]
3.13
SPD disconnector

device (internal and/or external) required for disconnecting an SPD from the power system

NOTE This disconnecting device is not required to have isolating capability. It is to prevent a persistent fault on the system and

is used to give indication of the SPD failure.

There may be more than one disconnector function for example, an overcurrent protection function and a thermal protection

function. These functions may be integrated into one unit or performed in separate units.

[EN 61643-11:2002, Definition 3.29]
------
...

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