SIST EN 60143-2:2013
(Main)Series capacitors for power systems - Part 2: Protective equipments for series capacitor banks
Series capacitors for power systems - Part 2: Protective equipments for series capacitor banks
This part of IEC 60143 covers protective equipment for series capacitor banks, with a size larger than 10 Mvar per phase. Protective equipment is defined as the main circuit apparatus and ancillary equipment, which are part of a series capacitor installation, but which are external to the capacitor part itself. The recommendations for the capacitor part are given in IEC 60143-1:2004. The protective equipment is mentioned in Clause 3 and 10.6 of IEC 60143-1:2004. The protective equipment, treated in this standard, comprises the following items listed below: - overvoltage protector, - protective spark gap, - varistor, - bypass switch, - disconnectors and earthing switches, - discharge current-limiting and damping equipment, - voltage transformer, - current sensors, - coupling capacitor, - signal column, - fibre optical platform links, - relay protection, control equipment and platform-to-ground communication equipment.
Reihenkondensatoren für Starkstromanlagen - Teil 2: Schutzeinrichtungen für Reihenkondensatorbatterien
Condensateurs série destinés à ètre installés sur des réseaux - Partie 2: Matériel de protection pour les batteries de condensateurs série
La CEI 60143-2:2012 concerne les matériels de protection pour les batteries de condensateurs série, de puissance supérieure à 10 Mvar par phase. Le matériel de protection est défini comme étant l'appareillage du circuit principal et du matériel auxiliaire, qui font partie de l'installation des condensateurs série, mais qui sont à l'extérieur de la partie constituée par les condensateurs eux-mêmes. Les recommandations pour la partie condensateur sont fournies dans la CEI 60143-1:2004. Les matériels de protection sont mentionnés aux 3 et 10.6 de la CEI 60143-1:2004. Cette deuxième édition annule et remplace la première édition publiée en 1994. Elle constitue une révision technique. Les modifications par rapport à l'édition précédente sont les suivantes: - mises à jour conformément aux nouvelles normes et aux normes révisées relatives aux composants; - mises à jour relatives aux évolutions technologiques. Les technologies obsolètes ont été retirées: condensateurs série à double éclateurs autodéclenchés. De nouvelles technologies ont été ajoutées: sondes de courant à la place des transformateurs de courant; - les essais des éclateurs ont été mis à jour pour décrire de manière plus claire les exigences et les procédures d'essai. Un nouvel essai au courant établi du shunt remplace l'ancien essai au courant de décharge; - L'Article 5, Guide, a été élargi avec plus d'information concernant les différents circuits d'amortissement et les protections de condensateurs série. Mots cles: protection pour les batteries de condensateurs série
Serijski kondenzatorji za elektroenergetske sisteme - 2. del: Zaščitna oprema za baterije serijskih kondenzatorjev
Ta del standarda IEC 60143 zajema zaščitno opremo za baterije serijskih kondenzatorjev, ki presegajo 10 Mvar po liniji. Zaščitna oprema je opredeljena kot aparat z glavnim vezjem in pomožno opremo, ki sta sestavni del inštalacije serijskega kondenzatorja, nista pa del samega kondenzatorja. Priporočila za sam kondenzator so podana v standardu IEC 60143-1:2004. Zaščitna oprema je omenjena v točkah 3 in 10.6 standarda IEC 60143-1:2004. Zaščitna oprema, obravnavana v tem standardu, obsega naslednje v nadaljevanju navedene elemente: – zaščita pred prenapetostjo, – zaščitno ločilno iskrišče, – varistor, – obvodno stikalo, – ločilniki in ozemljitvena stikala, – razelektritvena oprema za omejevanje toka in ublaževanje – napetostni transformator, – tokovni senzorji, – sklopni kondenzatorji, – opozorilni stolpec, – povezave ploščadi optičnih vlaken, – relejska zaščita, krmilna oprema in oprema za komunikacijo med ploščadjo in zemljo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60143-2:2013
01-september-2013
1DGRPHãþD
SIST EN 60143-2:2000
6HULMVNLNRQGHQ]DWRUML]DHOHNWURHQHUJHWVNHVLVWHPHGHO =DãþLWQDRSUHPD]D
EDWHULMHVHULMVNLKNRQGHQ]DWRUMHY
Series capacitors for power systems - Part 2: Protective equipments for series capacitor
banks
Condensateurs série destinés à ètre installés sur des réseaux - Partie 2: Matériel de
protection pour les batteries de condensateurs série
Ta slovenski standard je istoveten z: EN 60143-2:2013
ICS:
31.060.70 0RþQRVWQLNRQGHQ]DWRUML Power capacitors
SIST EN 60143-2:2013 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60143-2:2013
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SIST EN 60143-2:2013
EUROPEAN STANDARD
EN 60143-2
NORME EUROPÉENNE
June 2013
EUROPÄISCHE NORM
ICS 29.240.99; 31.060.70 Supersedes EN 60143-2:1994
English version
Series capacitors for power systems -
Part 2: Protective equipment for series capacitor banks
(IEC 60143-2:2012)
Condensateurs série destinés Reihenkondensatoren für
à être installés sur des réseaux - Starkstromanlagen -
Partie 2: Matériel de protection pour les Teil 2: Schutzeinrichtungen für
batteries de condensateurs série Reihenkondensatorbatterien
(CEI 60143-2:2012) (IEC 60143-2:2012)
This European Standard was approved by CENELEC on 2013-01-15. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the CEN-CENELEC Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the CEN-CENELEC Management Centre has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60143-2:2013 E
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SIST EN 60143-2:2013
EN 60143-2:2013 - 2 -
Foreword
The text of document 33/517/FDIS, future edition 2 of IEC 60143-2, prepared by IEC/TC 33 "Power
capacitors and their applications" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 60143-2:2013.
The following dates are fixed:
(dop) 2013-12-14
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2016-01-15
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60143-2:1994.
EN 60143-2:2013 includes the following significant technical changes with respect to
EN 60143-2:1994:
- updated with respect to new and revised component standards;
- updates with respect to technology changes. Outdated technologies have been removed, i.e.
series capacitors with dual self-triggered gaps. New technologies have been added, i.e. current
sensors instead of current transformers;
- the testing of spark gaps has been updated to more clearly specify requirements and testing
procedures. A new bypass making current test replaces the old discharge current test;
- Clause 5, Guide, has been expanded with more information about different damping circuits and
series capacitor protections.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment
Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice
The text of the International Standard IEC 60143-2:2012 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60068-1 NOTE Harmonised as EN 60068-1.
IEC 60068-2-2 NOTE Harmonised as EN 60068-2-2.
IEC 60068-2-78 NOTE Harmonised as EN 60068-2-78.
IEC 60068-2-30 NOTE Harmonised as EN 60068-2-30.
IEC 60071-1 NOTE Harmonised as EN 60071-1.
IEC 60071-2 NOTE Harmonised as EN 60071-2.
IEC 60143-3 NOTE Harmonised as EN 60143-3.
IEC 60255-1 NOTE Harmonised as EN 60255-1.
IEC 60383-1 NOTE Harmonised as EN 60383-1.
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SIST EN 60143-2:2013
- 3 - EN 60143-2:2013
IEC 60383-2 NOTE Harmonised as EN 60383-2.
IEC 60507 NOTE Harmonised as EN 60507.
IEC 60549 NOTE Harmonised as EN 60549.
IEC 60654-1 NOTE Harmonised as EN 60654-1.
IEC 60654-4 NOTE Harmonised as EN 60654-4.
IEC 60871-1 NOTE Harmonised as EN 60871-1.
IEC 60909 Series NOTE Harmonised as EN 60909 Series (not modified).
IEC 61000-4-2 NOTE Harmonised as EN 61000-4-2.
IEC 61000-4-11 NOTE Harmonised as EN 61000-4-11.
IEC 62217 NOTE Harmonised as EN 62217.
IEC 62271-100 NOTE Harmonised as EN 62271-100.
IEC 62223 NOTE Harmonised as EN 62223.
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SIST EN 60143-2:2013
EN 60143-2:2013 - 4 -
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60044 Series Instrument transformers EN 60044 Series
IEC 60044-1 - Instrument transformers - EN 60044-1 -
Part 1: Current transformers
IEC 60044-8 - Instrument transformers - EN 60044-8 -
Part 8: Electronic current transformers
IEC 60060 Series High-voltage test techniques EN 60060 Series
IEC 60076-1 - Power transformers - EN 60076-1 -
Part 1: General
IEC 60076-6 2007 Power transformers - EN 60076-6 2008
Part 6: Reactors
IEC 60099-4 2004 Surge arresters - EN 60099-4 2004
(mod) Part 4: Metal-oxide surge arresters without
+ A1 2006 gaps for a.c. systems +A1 2006
+ A2 2009 +A2 2009
IEC 60143-1 2004 Series capacitors for power systems - EN 60143-1 2004
Part 1: General
IEC 60255-5 - Electrical relays - EN 60255-5 -
Part 5: Insulation coordination for measuring
relays and protection equipment -
Requirements and tests
IEC 60255-21-1 - Electrical relays - EN 60255-21-1 -
Part 21: Vibration, shock, bump and seismic
tests on measuring relays and protection
equipment -
Section 1: Vibration tests (sinusoidal)
IEC 60270 - High-voltage test techniques - Partial EN 60270 -
discharge measurements
IEC 60358-1 - Coupling capacitors and capacitor dividers - EN 60358-1 -
Part 1: General rules
IEC 60358-2 - Coupling capacitors and capacitor dividers - EN 60358-2 -
Part 2: AC or DC single-phase coupling
capacitor connected between line and
ground for power line carrier-frequency
(PLC) application
IEC 60794-1-1 - Optical fibre cables - EN 60794-1-1 -
Part 1-1: Generic specification - General
IEC 60794-2 - Optical fibre cables - EN 60794-2 -
Part 2: Indoor cables - Sectional
specification
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SIST EN 60143-2:2013
- 5 - EN 60143-2:2013
Publication Year Title EN/HD Year
IEC 61000-4-29 - Electromagnetic compatibility (EMC) - EN 61000-4-29 -
Part 4-29: Testing and measurement
techniques - Voltage dips, short interruptions
and voltage variations on d.c. input power
port immunity tests
IEC 61109 - Insulators for overhead lines - Composite EN 61109 -
suspension and tension insulators for a.c.
systems with a nominal voltage greater than
1 000 V - Definitions, test methods and
acceptance criteria
IEC 61300-3-4 - Fibre optic interconnecting devices and EN 61300-3-4 -
passive components - Basic test and
measurement procedures -
Part 3-4: Examinations and measurements -
Attenuation
IEC 61869-3 - Instrument transformers - EN 61869-3 -
Part 3: Additional requirements for inductive
voltage transformers
IEC 61869-5 - Instrument transformers - EN 61869-5 -
Part 5: Additional Requirements for capacitor
voltage transformers
IEC 62271-1 - High-voltage switchgear and controlgear - EN 62271-1 -
Part 1: Common specifications
IEC 62271-102 2001 High-voltage switchgear and controlgear - EN 62271-102 2002
+ corr. April 2002 Part 102: Alternating current disconnectors + corr. March 2005
+ corr. May 2003 and earthing switches + corr. July 2008
+ corr. February 2005
IEC 62271-109 2008 High-voltage switchgear and controlgear - EN 62271-109 2009
Part 109: Alternating-current series capacitor
by-pass switches
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SIST EN 60143-2:2013
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SIST EN 60143-2:2013
IEC 60143-2
®
Edition 2.0 2012-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Series capacitors for power systems –
Part 2: Protective equipment for series capacitor banks
Condensateurs série destinés à être installés sur des réseaux –
Partie 2: Matériel de protection pour les batteries de condensateurs série
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 29.240.99; 31.060.70 ISBN 978-2-83220-546-4
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
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SIST EN 60143-2:2013
– 2 – 60143-2 IEC:2012
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions . 9
4 Quality requirements and tests . 15
4.1 Overvoltage protector . 15
4.2 Protective spark gap . 16
4.2.1 Purpose . 16
4.2.2 Classification of triggering principles . 16
4.2.3 Tests . 16
4.3 Varistor . 21
4.3.1 Purpose . 21
4.3.2 Classification . 21
4.3.3 Tests . 22
4.4 Bypass switch . 26
4.5 Disconnectors and earthing switches . 26
4.5.1 Purpose . 26
4.5.2 Classification . 27
4.5.3 Tests . 27
4.6 Discharge current-limiting and damping equipment (DCLDE) . 28
4.6.1 Purpose . 28
4.6.2 Classification . 28
4.6.3 Tests . 28
4.7 Voltage transformer . 32
4.7.1 Purpose . 32
4.7.2 Classification . 32
4.7.3 Tests . 32
4.8 Current sensors . 33
4.8.1 Purpose . 33
4.8.2 Classification . 33
4.8.3 Current transformer tests . 33
4.8.4 Electronic transformer tests . 33
4.8.5 Optical transducer tests . 33
4.9 Coupling capacitor. 34
4.9.1 Purpose . 34
4.9.2 Tests . 34
4.10 Signal column . 34
4.10.1 Purpose . 34
4.10.2 Tests . 34
4.11 Fibre optical platform links . 34
4.11.1 Purpose . 34
4.11.2 Tests . 35
4.12 Relay protection, control equipment and platform-to-ground communication
equipment . 35
4.12.1 Purpose . 35
4.12.2 Classification . 35
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SIST EN 60143-2:2013
60143-2 IEC:2012 – 3 –
4.12.3 Tests . 35
5 Guide . 36
5.1 General . 36
5.2 Specification data for series capacitors . 36
5.3 Protective spark gap . 37
5.4 Varistor . 38
5.4.1 General . 38
5.4.2 Varistor voltage-current characteristic . 39
5.4.3 Varistor current and voltage waveforms during a system fault . 40
5.4.4 Comments on varistor definitions and type tests . 41
5.5 Bypass switch . 44
5.6 Disconnectors . 44
5.7 Discharge current-limiting and damping equipment . 44
5.7.1 Purpose of the Discharge Current-Limiting and Damping Equipment . 44
5.7.2 Location of the DCLDE . 45
5.7.3 Configuration of the DCLDE. 47
5.7.4 Miscellaneous comments regarding the DCLDE . 48
5.8 Voltage transformer . 49
5.9 Current transformer . 49
5.10 Relay protection, control equipment and platform-to-ground communication
equipment . 49
5.11 Protection redundancy . 51
5.12 Commissioning tests . 52
5.13 Energization tests . 52
Bibliography . 54
Figure 1 – Typical nomenclature of a series capacitor installation . 7
Figure 2 – Classification of overvoltage protection . 16
Figure 3 – Illustration of waveforms in recovery voltage test . 19
Figure 4 – Typical voltage-current characteristics of one specific metal oxide varistor
element (95 mm diameter) . 40
Figure 5 – Current, voltage and energy waveforms for a phase-to-earth fault . 41
Figure 6 – Conventional location in the bypass branch . 45
Figure 7 – DCLDE in series with the capacitor and the parallel connected MOV . 45
Figure 8 – DCLDE in series with the capacitor and parallel to the MOV . 45
Figure 9 – Only a discharge current-limiting reactor . 47
Figure 10 – Discharge current-limiting reactor connected in parallel with a damping
resistor. A varistor is connected in series with the resistor . 47
Figure 11 – Discharge current-limiting reactor connected in parallel with a damping
resistor. A small spark gap is connected in series with the resistor . 47
Figure 12 – Current-limiting and damping equipment with and without damping resistor . 48
Table 1 – Summary of varistor energy absorption design criteria (example) . 38
Table 2 – Overview of typical series capacitor bank protections . 51
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SIST EN 60143-2:2013
– 4 – 60143-2 IEC:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SERIES CAPACITORS FOR POWER SYSTEMS –
Part 2: Protective equipment for series capacitor banks
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,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
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 non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
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.
International Standard IEC 60143-2 has been prepared by IEC technical committee 33: Power
capacitors and their applications.
This second edition cancels and replaces the first edition published in 1994. It constitutes a
technical revision. The main changes with respect to the previous edition are:
• updated with respect to new and revised component standards;
• updates with respect to technology changes. Outdated technologies have been removed,
i.e. series capacitors with dual self-triggered gaps. New technologies have been added,
i.e. current sensors instead of current transformers;
• the testing of spark gaps has been updated to more clearly specify requirements and
testing procedures. A new bypass making current test replaces the old discharge current
test;
• Clause 5, Guide, has been expanded with more information about different damping
circuits and series capacitor protections
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SIST EN 60143-2:2013
60143-2 IEC:2012 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
33/517/FDIS 33/521/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60143 series, under the general title Series capacitors for
power systems, can be found on the IEC website.
The committee has decided that the contents of this publication 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 publication. At this date, the publication 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.
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SIST EN 60143-2:2013
– 6 – 60143-2 IEC:2012
SERIES CAPACITORS FOR POWER SYSTEMS –
Part 2: Protective equipment for series capacitor banks
1 Scope
This part of IEC 60143 covers protective equipment for series capacitor banks, with a size
larger than 10 Mvar per phase. Protective equipment is defined as the main circuit apparatus
and ancillary equipment, which are part of a series capacitor installation, but which are
external to the capacitor part itself. The recommendations for the capacitor part are given in
IEC 60143-1:2004. The protective equipment is mentioned in Clause 3 and 10.6 of
IEC 60143-1:2004.
The protective equipment, treated in this standard, comprises the following items listed below:
– overvoltage protector,
– protective spark gap,
– varistor,
– bypass switch,
– disconnectors and earthing switches,
– discharge current-limiting and damping equipment,
– voltage transformer,
– current sensors,
– coupling capacitor,
– signal column,
– fibre optical platform links,
– relay protection, control equipment and platform-to-ground communication equipment.
See Figure 1.
Principles involved in the application and operation of series capacitors are given in Clause 5.
Examples of fault scenarios are given in Clause 5.
Examples of protective schemes utilizing different overvoltage protectors are given in 4.1.
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SIST EN 60143-2:2013
60143-2 IEC:2012 – 7 –
Key
1 assembly of capacitor units
2-7 main protective equipment
9 isolating disconnector
10 bypass disconnector
11 earth switch
Figure 1 – Typical nomenclature of a series capacitor installation
NOTE Most series capacitors are configured with a single module, unless the reactance and current requirements
result in a voltage across the bank that is impractical for the supplier to achieve with one module. Normally each
module has its own bypass switch but a common bypass switch can be used for more than one module. See 10.2.3
of IEC 60143-1:2004 for additional details.
The object of this standard is:
– to formulate uniform rules regarding performance, testing and rating,
– to illustrate different kinds of overvoltage protectors,
– to provide a guide for installation and operation.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60044 (all part
...
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