IEC 61869-14:2018

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.

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.

Električne inštalacije zgradb – 7. del: Zahteve za posebne inštalacije in lokacije – 713. oddelek: Pohištvo

General Information

• Status: Published
• Publication Date: 16-Jul-2018
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.020 - Electrical engineering in general
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: TC 38 - Instrument Transformers
• Drafting Committee: WG 37 - TC 38/WG 37
• Current Stage: PPUB - Publication issued
• Start Date: 06-Jul-2018
• Completion Date: 17-Jul-2018
• Ref Project: SIST IEC 60364-7-713:2000 - Electrical installations of buildings - Part 7: Requirements for special installations and locations - Section 713: Furniture

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2000
(OHNWULþQHLQãWDODFLMH]JUDGE±GHO=DKWHYH]DSRVHEQHLQãWDODFLMHLQORNDFLMH±
RGGHOHN3RKLãWYR
Electrical installations of buildings - Part 7: Requirements for special installations and
locations - Section 713: Furniture
Installations électriques des bâtiments - Partie 7: Règles pour les installations et
emplacements spéciaux - Section 713: Mobilier
Ta slovenski standard je istoveten z: IEC 60364-7-713
ICS:
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
97.140 Pohištvo Furniture
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
IEC
INTERNATIONALE
364-7-713
INTERNATIONAL
Première édition
STAN DARD First edition
1996-02
bâtiments
Installations électriques des —
Partie 7:
Règles pour les installations et emplacements
spéciaux —
Section 713: Mobilier
Electrical installations of buildings —
Part 7:
Requirements for special installations
and locations —
Section 713: Furniture
© CEI 1996 Droits de reproduction réservés — Copyright — all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher.
Genève, Suisse
Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
PRICE CODE
IEC Me*ayHapomiaa 3nefsrpoyexHH4ecnaR HoMuccus
voir catalogue en vigueur
Pour prix,
For price, see current catalogue

– 3 –
364-7-713 © IEC:1996
CONTENTS
Page
FOREWORD 5
Clause
700.1 Introduction 7
713 Furniture 7
713.1 General 7
713.1.1 Scope 7
713.1.2 Normative references 7
713.1.3 Definitions
11 Selection and erection of electrical equipment
713.5
713.51 Common rules
713.52 Wiring systems
713.55 Other equipment
364-7-713 © IEC:1996 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
ELECTRICAL INSTALLATIONS OF BUILDINGS -
Part 7: Requirements for special installations and locations -
Section 713: Furniture
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the
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4) In order to promote international unification, IEC National Committees undertake to apply IEC International
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The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
5)
equipment declared to be in conformity with one of its standards.
Attention is drawn to the possibility that some of the elements of this International Standard may be the
6)
subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 364-7-713 has been prepared by IEC technical committee 64:
Electrical installations of buildings.
The text of this standard is based on the following documents:
FDIS Report on voting
64/811/FDIS 64/835/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.

364-7-713 © IEC:1996 – 7 -
ELECTRICAL INSTALLATIONS OF BUILDINGS -
Part 7: Requirements for special installations and locations -
Section 713: Furniture
700.1 Introduction
The requirements of part 7 supplement, modify or replace the general requirements of the other
parts of IEC 364. The numbers following the particular number of the section of part 7 are
those of the corresponding parts, chapters, sections or clauses of IEC 364. The absence of a
reference to a chapter, section or clause means that the corresponding general requirements
are applicable.
713 Furniture
713.1 General
713.1.1 Scope
The particular requirements of this section apply to the wiring system of furniture (and similar
fitments) which is connected to the electrical installation.
Examples are beds, cupboards, desks and shop display cases, in which electrical equipment
such as luminaries, socket-outlets, switching devices and wiring systems are installed.
The requirements of this section apply to furniture connected by fixed wiring to the electrical
installation of the building and also to prefabricated furniture and furniture connected by means
of a plug and socket-outlet unless these items are the subject of other IEC publications.
Electrical equipment of furniture shall be connected to a single-phase supply <240 V, and the
total load current shall not exceed 16 A.
The requirements do not apply to electrical appliances and equipment specifically designed for
installation in furniture and which are the subject of other IEC publications, for example radios,
TV receivers, refrigerators and laboratory tables, installe
...

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

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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

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.
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...