EN IEC 61869-14:2019

Instrument transformers - Part 14: Additional requirements for current transformers for DC applications

IEC 61869-14:2018 provides all requirements specific to current transformers to be used in DC applications (DCCTs), whatever the technology used. The output signal can be analogue or digital. It is applicable to newly manufactured current transformers used for measuring, protection and/or control applications in DC power systems with a rated voltage above 1,5 kV. The general configuration of a single-pole low-power instrument transformer is described in Figure 601 of IEC 61869-6:2016. The DCCTs intended for current measurement in the transistor branch of the VSC valve (referred to as CT4a and CT4b in Figure 1403 and Table 1402) are not covered by this document, and will be considered in a future revision. IEC 61869-14:2018 applies to current transformers intended to be used in DC applications with at least one of the following functions: • measure DC current (with significant harmonics); • withstand DC voltage. Depending on the position on the DC system, different kinds of application exist, which are briefly described below, together with the approximate voltage or current wave shape.

Messwandler - Teil 14: Zusätzliche Anforderungen an Stromwandler für Gleichstromanwendungen

Transformateurs de mesure - Partie 14: Exigences supplémentaires concernant les transformateurs de courant pour application en courant continu

IEC 61869-14:2018 couvre toutes les exigences particulières concernant les transformateurs de courant utilisés dans les applications en courant continu (DCCTs), quelle que soit la technologie utilisée. Le signal de sortie peut être analogique ou numérique. Elle s'applique aux transformateurs de courant fabriqués récemment et utilisés pour des applications de mesure, de protection et/ou de commande sur des systèmes d'alimentation électrique en courant continu dont la tension assignée est supérieure à 1,5 kV. La configuration générale d'un transformateur de mesure de faible puissance unipolaire est décrite à la Figure 601 de l'IEC 61869-6:2016. Les transformateurs de courant continu destinés aux mesures de courant dans la branche du transistor de la valve VSC (dénommés CT4a et CT4b à la Figure 1403 et au Tableau 1402) ne sont pas couverts par le présent document et seront traités lors d'une prochaine révision. IEC 61869-14:2018 s'applique aux transformateurs de courant destinés à être utilisés dans les applications en courant continu avec l'une des fonctions suivantes au moins:
• mesurage du courant continu (avec des harmoniques élevées); • tension continue de tenue. Selon la position du système à courant continu, différents types d'applications existent. Ils sont décrits brièvement ci-dessous, ainsi que la tension approximative ou la forme d'onde du courant.

Instrumentni transformatorji - 14. del: Dodatne zahteve za tokovne transformatorje za enosmerno napajanje (IEC 61869-14:2018)

Ta del standarda IEC 61869 podaja vse zahteve, specifične za tokovne transformatorje, ki se uporabljajo pri enosmernem toku (DCCT-je), ne glede na uporabljeno tehnologijo. Izhodni signal je lahko analogni ali digitalni.
Uporablja se za nove tokovne transformatorje, ki se uporabljajo za merjenje, zaščito in/ali nadzor v omrežjih enosmernega toka z nazivno napetostjo nad 1,5 kV.
Splošna konfiguracija enopolnega nizkonapetostnega merilnega transformatorja je opisana na sliki 601 standarda IEC 61869-6:2016.
DCCT-ji, ki so namenjeni merjenju toka v tranzistorski veji ventila VSC (imenovani tudi CT4a in CT4b na sliki 1403 in v preglednici 1402), v tem dokumentu niso zajeti in bodo upoštevani v prihodnji reviziji.

General Information

• Status: Published
• Publication Date: 04-Jul-2019
• Withdrawal Date: 04-Jul-2022
• ICS: 17.200.20 - Temperature-measuring instruments
• Technical Committee: CLC/TC 38 - Instrument transformers
• Drafting Committee: IEC/TC 38 - IEC_TC_38
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 05-Jul-2019
• Completion Date: 05-Jul-2019
• Directive: 2004/108/EC - Directive 2004/108/EC of the European Parliament and of the Council of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Directive: 2004/108/EU - DIRECTIVE 2004/108/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Ref Project: SIST EN IEC 61869-14:2019 - Instrument transformers - Part 14: Additional requirements for current transformers for DC applications (IEC 61869-14:2018)

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2019
Instrumentni transformatorji - 14. del: Dodatne zahteve za tokovne transformatorje
za enosmerno napajanje (IEC 61869-14:2018)
Instrument transformers - Part 14: Additional requirements for current transformers for
DC applications (IEC 61869-14:2018)
Messwandler - Teil 14: Besondere Anforderungen für Gleichstromwandler (IEC 61869-
14:2018)
Transformateurs de mesure - Partie 14: Exigences supplémentaires concernant les
transformateurs de courant pour application en courant continu (IEC 61869-14:2018)
Ta slovenski standard je istoveten z: EN IEC 61869-14:2019
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61869-14

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 17.200.20
English Version
Instrument transformers - Part 14: Additional requirements for
current transformers for DC applications
(IEC 61869-14:2018)
Transformateurs de mesure - Partie 14: Exigences Messwandler - Teil 14: Besondere Anforderungen für
supplémentaires concernant les transformateurs de courant Gleichstromwandler
pour application en courant continu (IEC 61869-14:2018)
(IEC 61869-14:2018)
This European Standard was approved by CENELEC on 2018-08-21. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61869-14:2019 E

European foreword
The text of document 38/560/FDIS, future edition 1 of IEC 61869-14, prepared by IEC/TC 38
"Instrument transformers" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61869-14:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-01-05
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-07-05
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 61869-14:2018 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Clause 2 of IEC 61869-6:2016 is applicable, with the following additions and modifications:
Publication Year Title EN/HD Year
IEC/TS 60815-4 2019 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 4: Insulators for d.c.
systems
IEC/TS 61245:2015 2015 Artificial pollution tests on high-voltage - -
ceramic and glass insulators to be used on
d.c. systems
IEC 61869-6 2016 Instrument transformers - Part 6: Additional EN 61869-6 2016
general requirements for low-power
instrument transformers
IEC 61869-9 2016 Instrument transformers - Part 9: Digital EN IEC 61869-9 2019
interface for instrument transformers

IEC 61869-14 ®
Edition 1.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 14: Additional requirements for current transformers for DC applications

Transformateurs de mesure –
Partie 14: Exigences supplémentaires concernant les transformateurs de

courant pour application en courant continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5803-3

– 2 – IEC 61869-14:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 11
5 Ratings . 16
6 Design and construction . 20
7 Tests . 25
Annex 14A (informative) Equivalent thermal current in CTs for DC application . 37
14A.1 General . 37
14A.2 Current harmonic content . 37
14A.3 Losses in primary conductor due to harmonic content . 38
14A.4 Thermal test with AC current . 40
Annex 14B (informative) Proposed rated insulation level applicable to current
transformers for DC application. 41
Bibliography . 42

Figure 1401 – Example of LCC scheme . 7
Figure 1402 – Typical scheme for VSC – symmetrical monopole . 8
Figure 1403 – Typical scheme for VSC – asymmetrical monopole or bipole . 9
Figure 1404 – Typical step responses of a system . 14
Figure 1405 – Accuracy limits of a DCCT . 19
Figure 1406 – Polarity reversal test profile . 30
Figure 1407 – Measurement of the step response time . 32
Figure 14A.1 – Typical waveform of current flowing in the primary conductor for LCC
applications . 37
Figure 14A.2 – The two terms that make up the total losses in the primary conductor . 39
Figure 14A.3 – Additional losses in conductors due to typical current harmonics . 40
Figure 14A.4 – Power-frequency losses in conductors compared to DC losses . 40

Table 1401 – Current and voltage in current transformers for LCC application . 8
Table 1402 – Current and voltage in current transformers for VSC application . 10
Table 3 – Partial discharge test voltages and permissible levels . 17
Table 1403 – Limits of ratio error for DCCT (classes from 0,1 to 1) . 19
Table 7 – Static withstand test loads . 21
Table 8 – Arc fault duration and performance criteria . 22
Table 1404 – Markings of terminals . 23
Table 1405 – Rating plate marking for common rating plate . 24
Table 1406 – Rating plate marking for each secondary converter . 24
Table 1407 – Rating plate marking for auxiliary power supply . 25

IEC 61869-14:2018 © IEC 2018 – 3 –
Table 10 – List of tests. 26
Table 14A.1 – Typical harmonic current values (800 kV LCC) . 38
Table 14B.1 – Proposed rated primary terminal insulation levels for current
transformers for DC application. 41

– 4 – IEC 61869-14:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 14: Additional requirements for current
transformers for DC applications

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,
...

SLOVENSKI STANDARD
01-oktober-2019
Merilni transformatorji - 14. del: Dodatne zahteve za tokovne transformatorje za
enosmerno napajanje (IEC 61869-14:2018)
Instrument transformers - Part 14: Additional requirements for current transformers for
DC applications (IEC 61869-14:2018)
Messwandler - Teil 14: Besondere Anforderungen für Gleichstromwandler (IEC 61869-
14:2018)
Transformateurs de mesure - Partie 14: Exigences supplémentaires concernant les
transformateurs de courant pour application en courant continu (IEC 61869-14:2018)
Ta slovenski standard je istoveten z: EN IEC 61869-14:2019
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61869-14

NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 17.200.20
English Version
Instrument transformers - Part 14: Additional requirements for
current transformers for DC applications
(IEC 61869-14:2018)
Transformateurs de mesure - Partie 14: Exigences Messwandler - Teil 14: Besondere Anforderungen für
supplémentaires concernant les transformateurs de courant Gleichstromwandler
pour application en courant continu (IEC 61869-14:2018)
(IEC 61869-14:2018)
This European Standard was approved by CENELEC on 2018-08-21. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61869-14:2019 E

European foreword
The text of document 38/560/FDIS, future edition 1 of IEC 61869-14, prepared by IEC/TC 38
"Instrument transformers" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61869-14:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-01-05
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-07-05
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s).
For the relationship with EU Directive(s) see informative Annex ZZ, which is an integral part of this
document.
Endorsement notice
The text of the International Standard IEC 61869-14:2018 was approved by CENELEC as a European
Standard without any modification.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Clause 2 of IEC 61869-6:2016 is applicable, with the following additions and modifications:
Publication Year Title EN/HD Year
IEC/TS 60815-4 2019 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 4: Insulators for d.c.
systems
IEC/TS 61245:2015 2015 Artificial pollution tests on high-voltage - -
ceramic and glass insulators to be used on
d.c. systems
IEC 61869-6 2016 Instrument transformers - Part 6: Additional EN 61869-6 2016
general requirements for low-power
instrument transformers
IEC 61869-9 2016 Instrument transformers - Part 9: Digital EN IEC 61869-9 2019
interface for instrument transformers

IEC 61869-14 ®
Edition 1.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 14: Additional requirements for current transformers for DC applications

Transformateurs de mesure –
Partie 14: Exigences supplémentaires concernant les transformateurs de

courant pour application en courant continu

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5803-3

– 2 – IEC 61869-14:2018 © IEC 2018
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 11
2 Normative references . 11
3 Terms and definitions . 11
5 Ratings . 16
6 Design and construction . 20
7 Tests . 25
Annex 14A (informative) Equivalent thermal current in CTs for DC application . 37
14A.1 General . 37
14A.2 Current harmonic content . 37
14A.3 Losses in primary conductor due to harmonic content . 38
14A.4 Thermal test with AC current . 40
Annex 14B (informative) Proposed rated insulation level applicable to current
transformers for DC application. 41
Bibliography . 42

Figure 1401 – Example of LCC scheme . 7
Figure 1402 – Typical scheme for VSC – symmetrical monopole . 8
Figure 1403 – Typical scheme for VSC – asymmetrical monopole or bipole . 9
Figure 1404 – Typical step responses of a system . 14
Figure 1405 – Accuracy limits of a DCCT . 19
Figure 1406 – Polarity reversal test profile . 30
Figure 1407 – Measurement of the step response time . 32
Figure 14A.1 – Typical waveform of current flowing in the primary conductor for LCC
applications . 37
Figure 14A.2 – The two terms that make up the total losses in the primary conductor . 39
Figure 14A.3 – Additional losses in conductors due to typical current harmonics . 40
Figure 14A.4 – Power-frequency losses in conductors compared to DC losses . 40

Table 1401 – Current and voltage in current transformers for LCC application . 8
Table 1402 – Current and voltage in current transformers for VSC application . 10
Table 3 – Partial discharge test voltages and permissible levels . 17
Table 1403 – Limits of ratio error for DCCT (classes from 0,1 to 1) . 19
Table 7 – Static withstand test loads . 21
Table 8 – Arc fault duration and performance criteria . 22
Table 1404 – Markings of terminals . 23
Table 1405 – Rating plate marking for common rating plate . 24
Table 1406 – Rating plate marking for each secondary converter . 24
Table 1407 – Rating plate marking for auxiliary power supply . 25

IEC 61869-14:2018 © IEC 2018 – 3 –
Table 10 – List of tests. 26
Table 14A.1 – Typical harmonic current values (800 kV LCC) . 38
Table 14B.1 – Proposed rated primary terminal insulation levels for current
transformers for DC application. 41

– 4 – IEC 61869-14:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 14: Additional requirements for current
transformers for DC applications

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 director
...