Integration of internal arc-fault mitigation systems in power switchgear and controlgear assemblies (PSC‑Assemblies) according to IEC 61439-2

IEC TS 63107:2020 states requirements for integration and testing of IAMS in low-voltage switchgear and controlgear assemblies – power switchgear and controlgear assemblies according to IEC 61439-1 and IEC 61439-2 (PSC-assemblies) to demonstrate their correct operation.
This document does not address personnel safety or damage to the PSC-assembly. These requirements are dealt with in IEC TR 61641 (see also 10.10.1).

Intégration de systèmes de limitation de défaut d'arc interne dans des ensembles d'appareillage de puissance (EAP) conformément à l'IEC 61439-2

L'IEC TS 63107:2020 définit les exigences d'intégration et d'essai d'un IAMS dans des ensembles d'appareillage à basse tension – ensembles d'appareillage de puissance (EAP), conformément à l'IEC 61439-1 et l'IEC 61439-2, afin de démontrer leur bon fonctionnement.
Le présent document ne traite pas de la sécurité du personnel ou de dommages causés à l'EAP. Ces exigences sont couvertes par l'IEC TR 61641 (voir également 10.10.1).

General Information

Status
Published
Publication Date
27-Apr-2020
Current Stage
PPUB - Publication issued
Completion Date
28-Apr-2020
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IEC TS 63107
Edition 1.0 2020-04
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Integration of internal arc-fault mitigation systems in power switchgear and
controlgear assemblies (PSC assemblies) according to IEC 61439-2
Intégration de systèmes de limitation de défaut d'arc interne dans des
ensembles d'appareillage de puissance (EAP) conformément à l'IEC 61439-2
IEC TS 63107:2020-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 63107
Edition 1.0 2020-04
TECHNICAL
SPECIFICATION
SPECIFICATION
TECHNIQUE
colour
inside
Integration of internal arc-fault mitigation systems in power switchgear and
controlgear assemblies (PSC assemblies) according to IEC 61439-2
Intégration de systèmes de limitation de défaut d'arc interne dans des
ensembles d'appareillage de puissance (EAP) conformément à l'IEC 61439-2
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-8249-6

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

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63107:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Symbols and abbreviated terms ..................................................................................... 10

5 Interface characteristics................................................................................................. 10

6 Information .................................................................................................................... 10

7 Service conditions ......................................................................................................... 11

8 Constructional requirements .......................................................................................... 11

9 Performance requirements............................................................................................. 12

10 Design verification ......................................................................................................... 13

11 Routine verification ........................................................................................................ 22

Annex HH (informative) Guidance for the user of PSC-assemblies about the aspects

to be considered when specifying a PSC-assembly with an integrated IAMS ......................... 24

HH.1 General information ................................................................................................... 24

HH.2 Influence of the electrical parameters of the supply ................................................... 25

HH.3 Interaction with other devices/systems in the PSC-assembly ..................................... 26

Annex II (informative) Guidance for the original manufacturer of PSC-assemblies on

construction requiring particular attention when incorporating IAMS ...................................... 28

II.1 Selection of devices forming parts of an IAMS ............................................................... 28

II.2 Installation of switching devices and components .......................................................... 28

II.3 Accessibility .................................................................................................................. 29

Annex JJ (informative) Description of the extinction of an internal arc-fault in a PSC-

assembly by an IAMS using an AQD during testing ............................................................... 30

JJ.1 General ....................................................................................................................... 30

JJ.2 Circuit diagram and event description .......................................................................... 30

JJ.3 Selected oscillograms .................................................................................................. 31

Bibliography .......................................................................................................................... 38

Figure HH.1 – Time/current characteristic curves NH- Fuse-links Size 000 –

3 gG AC 400 V IEC 60269-2 ................................................................................................. 25

Figure JJ.1 – Circuit diagram ................................................................................................ 30

Figure JJ.2 – Incoming currents at the beginning of the sequence ........................................ 31

Figure JJ.3 – Currents and voltages at the incoming terminals at the end of the

sequence .............................................................................................................................. 32

Figure JJ.4 – Currents in the AQD circuit .............................................................................. 33

Figure JJ.5 – Currents in the arc-fault circuit ......................................................................... 34

Figure JJ.6 – Currents in the arc-fault circuit, curves magnified ............................................ 35

Figure JJ.7 – Voltages at the incoming terminals .................................................................. 36

Figure JJ.8 – Electrical energy caused by the arc-fault currents and the voltages at the

incoming terminals with t as the start point for calculation ................................................... 37

Table 1 – Symbols and abbreviated terms ............................................................................ 10

---------------------- Page: 4 ----------------------
IEC TS 63107:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INTEGRATION OF INTERNAL ARC-FAULT MITIGATION SYSTEMS IN
POWER SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
(PSC-ASSEMBLIES) ACCORDING TO IEC 61439-2
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

The main task of IEC technical committees is to prepare International Standards. In

exceptional circumstances, a technical committee may propose the publication of a Technical

Specification when

• the required support cannot be obtained for the publication of an International Standard,

despite repeated efforts, or

• the subject is still under technical development or where, for any other reason, there is the

future but no immediate possibility of an agreement on an International Standard.

Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC TS 63107, which is a technical specification, has been prepared by subcommittee 121B:

Low-voltage switchgear and controlgear assemblies, of IEC technical committee 121:

Switchgear and controlgear and their assemblies for low-voltage.
---------------------- Page: 5 ----------------------
– 4 – IEC TS 63107:2020 © IEC 2020
The text of this technical specification is based on the following documents:
DTS Report on voting
121B/89/DTS 121B/97/RVDTS

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This technical specification is to be read in conjunction with IEC 61439-1 and IEC 61439-2.

The provisions of IEC 61439-1 and IEC 61439-2 are applicable to this document where they

are specifically cited. When this document states "addition", "modification" or "replacement",

the relevant text in IEC 61439-1 and IEC 61439-2 is to be adapted accordingly.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related

to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 6 ----------------------
IEC TS 63107:2020 © IEC 2020 – 5 –
INTRODUCTION

Internal arc-fault mitigation systems (IAMS) denote systems that consist of an internal arc-

fault control device (IACD) and an internal arc-fault reduction device (IARD).
An IACD and an IARD can be combined and designed in one device.

An IACD uses the effects of an arc, e.g. light, gas pressure, change of current and/or voltage

to detect an arc inside the power switchgear and controlgear assembly (PSC-assembly) to

generate a trigger signal for an associated IARD.

An IARD reduces the arc energy below the level which would be released if an IARD was not

present and the fault would be interrupted by the conventional short-circuit protective device

(SCPD).

The operation of IARDs can be achieved by various methods, individually or in combination

including, but not limited to, the following examples:
a) by interruption using an upstream SCPD triggered by an IACD;

b) by parallel connection of a low-impedance current path by using an arc quenching device

(AQD) for commutation of current to this parallel path. The operation of an upstream

SCPD is also required to interrupt the short-circuit current caused by the AQD before it

exceeds its current carrying capabilities;

c) by introducing a defined impedance in series with the arc-fault circuit by using an internal

arc-fault limiting device (IALD). An upstream SCPD may be required to extinguish the arc.

The most commonly used techniques are described under a) and b) above.
The purpose of this document is:

to define the specific requirements for the correct integration of the IAMS into PSC-

assemblies which shall be fulfilled by the original manufacturer of the assembly.

to provide the necessary requirements in order to verify the correct operation of the IAMS.

to provide the user with details of the different options that can be considered when

requiring IAMS within a PSC-assembly.

to provide guidance to the original manufacturer of PSC-assemblies on the constructional

requirements needing particular attention when incorporating the IAMS.

For the safe and reliable operation of the IAMS, the proper operation of the IARD in

conjunction with the accompanying IACD is crucial. It is assumed, that passing all tests

detailed in this document will verify the correct functioning of the entire system (combination

and integration of the respective devices).

This document defines tests to verify there will be no unintentional operation of the IAMS

which could be caused by e.g. switching operation of built-in components.

It is important to consider the behaviour of the complete system when an internal arc occurs

immediately after the assembly is energised.

Additionally, external influences in surrounding environment, e.g. sources of light, have to be

considered.

The aim of the integration of the IAMS into PSC-assemblies is to reduce the released energy

in case of an internal arc-fault by using the activation of an IARD in order to:
reduce the damage to PSC-assemblies;
---------------------- Page: 7 ----------------------
– 6 – IEC TS 63107:2020 © IEC 2020

improve the suitability of PSC-assemblies for further service after an internal arc-fault;

improve the ability of PSC-assemblies to reduce the risk of injury to personnel;

The protection offered by an IAMS has some limitations. These are described in this

document in the term "IAMS protected area" (verified within specific ranges of values for the

rated operational voltage and the prospective short-circuit current) for the correct functioning

of the IAMS.

IEC TR 61641 provides guidance for testing of PSC-assemblies with an integrated IAMS

under conditions of arcing in air due to an internal fault and addresses personnel safety and

damage to the PSC-assembly. Subclause 10.101.4 of this document (Verification of an IAMS

in PSC-assemblies by test) is intended to be used in conjunction with IEC TR 61641.

---------------------- Page: 8 ----------------------
IEC TS 63107:2020 © IEC 2020 – 7 –
INTEGRATION OF INTERNAL ARC-FAULT MITIGATION SYSTEMS IN
POWER SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
(PSC-ASSEMBLIES) ACCORDING TO IEC 61439-2
1 Scope

This document states requirements for integration and testing of IAMS in low-voltage

switchgear and controlgear assemblies – power switchgear and controlgear assemblies

according to IEC 61439-1 and IEC 61439-2 (PSC-assemblies) to demonstrate their correct

operation.

This document does not address personnel safety or damage to the PSC-assembly. These

requirements are dealt with in IEC TR 61641 (see also 10.10.1).

NOTE This document can be used as a reference for other types of assemblies in the IEC 61439 series, but

adaptation of the test procedures and acceptance criteria can apply taking into account the specifics of such other

assemblies or products.

IAMS consist of IACDs and IARDs complying with their relevant product standard (e.g. optical

based IACDs in accordance with IEC 60947-9-2, AQDs in accordance with IEC 60947-9-1 and

SCPD’s in accordance with IEC 60947-2). For the reliable function in a PSC-assembly, the

verification of correct operation of the complete system under built-in conditions is addressed.

This document applies only to enclosed PSC-assemblies and deals with all required

verifications needed for the integration in conjunction with IEC 61439-1 and IEC 61439-2.

The test procedure given in this document takes into consideration:
the correct function of the IAMS within the PSC-assembly;
the prevention of unintended operation of the IAMS within the PSC-assembly;

the functioning behaviour of the system immediately after the assembly is energised.

Different tests under more severe conditions (e.g. doors in open position) can be performed

with an agreement between the user and the original manufacturer of the PSC-assembly.

This document does not supersede any individual product standard. Individual devices are

required to comply with their relevant standard.

This document does not apply to integration of arc fault detection devices (AFDD) according

to IEC 62606.

The informative Annex II gives guidance on particular constructional requirements for

incorporation of IAMS within a PSC-assembly.

The informative Annex HH gives guidance for the user of PSC-assemblies about the criteria to

be considered when specifying a PSC-assembly with an integrated IAMS.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements 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.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 63107:2020 © IEC 2020

IEC 60947-9-1:2019, Low-voltage switchgear and controlgear - Part 9-1: Active arc-fault

mitigation systems - Arc quenching devices

IEC 60947-9-2:—, Low-voltage switchgear and controlgear - Active arc-fault mitigation

systems - Part 9-2: Optical-based internal arc-detection and mitigation devices

IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies - Part 1: General

rules
IEC 61439-2:—, Low-voltage switchgear and controlgear assemblies - Part 2: Power
switchgear and controlgear assemblies

IEC TR 61641:2014, Enclosed low-voltage switchgear and controlgear assemblies - Guide for

testing under conditions of arcing due to internal fault
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61439-2, and the

following, apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
internal arc-fault mitigation system
IAMS

system consisting of an internal arc-fault control device (IACD) and an internal arc-fault

reduction device (IARD) that operates in case of an internal arc-fault

Note 1 to entry: An IAMS can include a "combined type" single device which combines the functions of an IACD

and an IARD as defined in IEC 60947-9-2.
Note 2 to entry: This note applies to the French language only.
3.2
internal arc-fault control device
IACD

device intended to detect an internal arc-fault, which provides a signal for operation of a

separate mitigation device, or automatically mitigates the internal arc-fault

Note 1 to entry: IACD with mitigation capability combines in the same device internal arc-fault detection and

breaking or making capabilities.
Note 2 to entry: This note applies to the French language only.
[SOURCE: IEC 60947-9-2:—, 3.3]
_____________
Under preparation. Stage at the time of publication: IEC/CCDV 60947-9-2:2020.
Under preparation. Stage at the time of publication: IEC/RFDIS 61439-2:2020.
---------------------- Page: 10 ----------------------
IEC TS 63107:2020 © IEC 2020 – 9 –
3.3
internal arc-fault reduction device
IARD
device intended to reduce the energy released by an internal arc-fault
Note 1 to entry: An IARD can be achieved by a SCPD, AQD or IALD.
Note 2 to entry: This note applies to the French language only.
3.3.1
arc quenching device
AQD

IARD intended to eliminate internal arc-faults by creating a lower impedance current path in

order to cause the arcing current to transfer to the new current path
Note 1 to entry: This note applies to the French language only.

[SOURCE: IEC 60947-9-1:2019, 3.1, modified – In the definition "device" has been replaced

with "IARD" and the Note 1 to entry has been deleted.]
3.3.2
internal arc-fault limiting device
IALD

IARD intended to reduce the arc-fault current below a particular level other than a SCPD with

current limiting functionality e.g. fuse or circuit-breaker
Note 1 to entry: This note applies to the French language only.
3.4
IAMS protected area

area monitored by an IAMS where an internal arc-fault is detected, mitigated and finally

extinguished, and where unintended operation as a result of a switching arc will not occur

3.5
automatic transfer switching equipment
ATSE
self-acting transfer switching equipment

Note 1 to entry: ATSE normally includes all necessary devices for monitoring and transferring operations.

Note 2 to entry: ATSE can have an optional feature for manual operation.
Note 3 to entry: This note applies to the French language only.
[SOURCE: IEC 60947-6-1:2005/AMD1:2013, 3.1.4]
3.6
arc-fault mitigation time in an assembly
mtA

interval of time between the ignition t of the internal arc-fault and the significant commutation

of currents into the AQD

Note 1 to entry: Arc-fault mitigation time in an assembly is as described in Figure JJ.2 between points c) and g).

Note 2 to entry: For applications without AQD(s) the arc-fault extinction time of IEC 60947-9-2 can be used as an

alternative to t .
mtA
3.7
arc-energy
arc
energy released by the arc during the arcing-fault
---------------------- Page: 11 ----------------------
– 10 – IEC TS 63107:2020 © IEC 2020
4 Symbols and abbreviated terms

For the purposes of this document, symbols and abbreviated terms given in IEC 61439-2, as

well as those given in Table 1, apply.
Table 1 – Symbols and abbreviated terms
Symbol/Abbreviated Term Subclause
term
ACB air circuit-breaker JJ.1
AQD arc quenching device 3.3.1
ATSE automatic transfer switching equipment 3.5
E arc-energy 3.7
arc
IACD internal arc-fault control device 3.2
IALD internal arc-fault limiting device 3.3.2
IAMS internal arc-fault mitigation system 3.1
IARD internal arc-fault reduction device 3.3
t arc-fault mitigation time in an assembly 3.6
mtA
5 Interface characteristics
Clause 5 of IEC 61439-2 is applicable except as follows.
Addition:
5.101 Characteristics for each individual IAMS protected area
Declaration of IAMS protected areas shall include following parameters:

range of prospective short-circuit current (I ) at the incoming terminals of the PSC-

assembly declared for each IAMS protected area for which the IAMS is effective;

range of rated operational voltages (U ) at the incoming terminals of the PSC-assembly

declared for each IAMS protected area for which the IAMS is effective;

maximum arc energy during the tests (E ) which is the highest value declared for the

arc
whole assembly defined by test(s) in 10.101.4.

The functioning behaviour of the IAMS immediately after the assembly is energised shall be

considere
...

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