Instrument transformers - Part 15: Additional requirements for voltage transformers for DC applications

IEC 61869-15:2018 provides all requirements specific to voltage transformers to be used in DC applications (DCVTs), whatever the technology used. The output signal can be analogue or digital. It is applicable to newly manufactured voltage transformers used for measuring, protection and/or control applications in DC power systems with a rated voltage above 1,5 kV. This document covers passive voltage dividers as well as active voltage transformers, used for measurement, control and protection. The general configuration of a single-pole low-power instrument transformer is described in Figure 601 of IEC 61869-6:2016. IEC 61869-15:2018 applies to voltage transformers (VT) intended to be used in DC applications with the following functions: • measure DC voltage (with significant harmonics); • withstand DC voltage. Two main technologies of DC converters exist today: LCC and VSC • Line-commutated converters (LCC) are based on thyristor converters. They are characterized by a single direction of current flow, and a voltage polarity reversal possibility. Significant voltage and current harmonics exist up to frequencies of about 3 kHz to 4 kHz. • Voltage source converters (VSC) are based on transistor converters. They are characterized by a bi-directional current flow and a single voltage polarity. Voltage and current harmonics exist up to frequencies of about 20 kHz.

Messwandler - Teil 15: Zusätzliche Anforderungen an Spannungswandler für Gleichstromanwendungen

Transformateurs de mesure - Partie 15: Exigences supplémentaires concernant les transformateurs de tension pour application en courant continu

IEC 61869-15:2018 couvre toutes les exigences particulières concernant les transformateurs de tension utilisés dans les applications en courant continu (transformateurs de tension pour courant continu), quelle que soit la technologie utilisée. Le signal de sortie peut être analogique ou numérique. Elle s'applique aux transformateurs de tension 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. Le présent document couvre les diviseurs de tension passifs et les transformateurs de tension actifs utilisés à des fins de mesurage, de commande et de protection. La configuration générale d'un transformateur de mesure de faible puissance unipolaire est décrite à la Figure 601 de l'IEC 61869-6:2016. IEC 61869-15:2018 s'applique aux transformateurs de tension (VT, Voltage Transformer) destinés à être utilisés dans les applications en courant continu avec les fonctions suivantes: • mesurage de la tension continue (avec des harmoniques élevées); • tension continue de tenue. Il existe aujourd'hui deux principales technologies de convertisseur de courant continu: les convertisseurs commutés par le réseau (LCC, Line-Commutated Converter) et les convertisseurs de source de tension (VSC, Voltage Source Converter) • Les convertisseurs commutés par le réseau (LCC) sont basés sur les convertisseurs à thyristor. Ils se caractérisent par un flux de courant unidirectionnel et la possibilité d'inverser la polarité de la tension. Des harmoniques de tension et de courant élevées existent jusqu'à des fréquences d'environ 3 kHz à 4 kHz. • Les convertisseurs de source de tension (VSC) sont basés sur les convertisseurs à transistor. Ils se caractérisent par un flux de courant unidirectionnel et une polarité de tension unique. Des harmoniques de tension et de courant élevées existent jusqu'à des fréquences d'environ 20 kHz.

Instrumentni transformatorji - 15. del: Posebne zahteve za napetostne transformatorje (IEC 61869-15:2018)

Ta del standarda IEC 61869 podaja vse zahteve, specifične za napetostne transformatorje, ki se uporabljajo pri enosmernem toku (DCVT-je), ne glede na uporabljeno tehnologijo. Izhodni signal je lahko analogni ali digitalni.
Uporablja se za nove napetostne transformatorje, ki se uporabljajo za merjenje, zaščito in/ali nadzor v omrežjih enosmernega toka z nazivno napetostjo nad 1,5 kV.
Ta dokument zajema tako razdelilnike pasivne napetosti kot tudi transformatorje aktivne napetosti, ki se uporabljajo za nadzor in zaščito.
Splošna konfiguracija enopolnega nizkonapetostnega merilnega transformatorja je opisana na sliki 601 standarda IEC 61869-6:2016.

General Information

Status
Published
Publication Date
04-Jul-2019
Drafting Committee
Current Stage
6060 - Document made available
Due Date
05-Jul-2019
Completion Date
05-Jul-2019

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SLOVENSKI STANDARD
SIST EN IEC 61869-15:2019
01-oktober-2019
Instrumentni transformatorji - 15. del: Posebne zahteve za napetostne
transformatorje (IEC 61869-15:2018)

Instrument Transformers - Part 15: Specific Requirements for DC Voltage Transformers

(IEC 61869-15:2018)
Messwandler - Teil 15: Besondere Anforderungen für Gleichspannungswandler (IEC
61869-15:2018)
Transformateurs de mesure - Part 15: Exigences supplémentaires concernant les
transformateurs de tension pour CC (IEC 61869-15:2018)
Ta slovenski standard je istoveten z: EN IEC 61869-15:2019
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN IEC 61869-15:2019 en

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

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SIST EN IEC 61869-15:2019
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SIST EN IEC 61869-15:2019
EUROPEAN STANDARD EN IEC 61869-15
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 17.220.20
English Version
Instrument transformers - Part 15: Additional requirements for
voltage transformers for DC applications
(IEC 61869-15:2018)

Transformateurs de mesure - Partie 15: Exigences Messwandler - Teil 15: Besondere Anforderungen für

supplémentaires concernant les transformateurs de tension Gleichspannungswandler
pour application en courant continu (IEC 61869-15:2018)
(IEC 61869-15:2018)

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 61869-15:2019 E
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SIST EN IEC 61869-15:2019
EN IEC 61869-15:2019 (E)
European foreword

The text of document 38/561/FDIS, future edition 1 of IEC 61869-15, prepared by IEC/TC 38

"Instrument transformers" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 61869-15:2019.
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.

Endorsement notice

The text of the International Standard IEC 61869-15:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60358-1:2012 NOTE Harmonized as EN 60358-1:2012 (not modified)
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SIST EN IEC 61869-15:2019
EN IEC 61869-15:2019 (E)
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:
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 61869-1 (mod) 2007 Instrument transformers - Part 1: General EN 61869-1 2009

requirements
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
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SIST EN IEC 61869-15:2019
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SIST EN IEC 61869-15:2019
IEC 61869-15
Edition 1.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 15: Additional requirements for voltage transformers for DC applications
Transformateurs de mesure –
Partie 15: Exigences supplémentaires concernant les transformateurs de
tension pour application en courant continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5804-0

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 IEC 61869-15:2019
– 2 – IEC 61869-15:2018 © IEC 2018
CONTENTS

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

INTRODUCTION ..................................................................................................................... 6

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

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

3 Terms, definitions, abbreviated terms and symbols .......................................................... 8

5 Ratings .......................................................................................................................... 12

6 Design and construction ................................................................................................ 15

7 Tests ............................................................................................................................. 20

Annex 15A (informative) Proposed rated insulation level applicable to voltage

transformers for DC application............................................................................................. 34

Bibliography .......................................................................................................................... 35

Figure 1501 – Position of the DCVT’s in the DC scheme ......................................................... 6

Figure 1502 – Typical step responses of a system ................................................................ 10

Figure 1503 – Accuracy limits of a DCVT .............................................................................. 14

Figure 1504 – RC divider with low-voltage part outside the main housing ............................. 25

Figure 1505 – Connection for voltage withstand test of the external low voltage part of

a DCVT ................................................................................................................................. 26

Figure 1506 – Polarity reversal test profile ............................................................................ 27

Figure 1507– Measurement of the step response time .......................................................... 29

Table 1501 – Voltage on DCVT’s ............................................................................................ 6

Table 3 – Partial discharge test voltages and permissible levels ........................................... 13

Table 1502 – Limits of ratio error for DCVT (classes from 0,1 to 3) ...................................... 14

Table 7 – Static withstand test loads ..................................................................................... 16

Table 8 – Arc fault duration and performance criteria ............................................................ 17

Table 1503 – Markings of terminals ...................................................................................... 18

Table 1504 – Rating plate marking for common rating plate .................................................. 19

Table 1505 – Rating plate marking for each secondary converter ......................................... 19

Table 1506 – Rating plate marking for auxiliary power supply ............................................... 20

Table 10 – List of tests.......................................................................................................... 21

Table 15A.1 – Proposed rated primary terminal insulation levels for voltage

transformers for DC application............................................................................................. 34

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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 15: Additional requirements for
voltage 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, 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 61869-15 has been prepared by IEC technical committee 38:

Instrument transformers.
The text of this standard is based on the following documents:
FDIS Report on voting
38/561/FDIS 38/566/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

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

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SIST EN IEC 61869-15:2019
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A list of all parts in the IEC 61869 series, published under the general title Instrument

transformers, can be found on the IEC website.

This Part 15 is to be used in conjunction with IEC 61869-1:2007, General Requirements, and

IEC 61869-6:2016, Additional general requirements for low-power instrument transformers –

however, the reader is encouraged to use the most recent edition.
This Part 15 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and
supplements or modifies their corresponding clauses.

When a subclause of Part 1 or Part 6 is not mentioned in this Part 15, that subclause applies.

When this standard states "addition", "modification" or "replacement", the relevant text in

Part 1 or Part 6 is to be adapted accordingly.

For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering

system is used:

• clauses, subclauses, tables, figures and notes that are numbered starting from 1501 are

additional to those in Part 1 and Part 6;
• additional annexes are lettered 15A, 15B, etc.

An overview of the planned set of standards at the date of publication of this document is

given below. The updated list of standards issued by IEC TC 38 is available at the website:

www.iec.ch.
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
61869-1 61869-2 ADDITIONAL REQUIREMENTS FOR 60044-1
CURRENT TRANSFORMERS 60044-6
GENERAL
REQUIREMENTS
61869-3 ADDITIONAL REQUIREMENTS FOR 60044-2
INDUCTIVE VOLTAGE TRANSFORMERS
61869-4 ADDITIONAL REQUIREMENTS FOR 60044-3
COMBINED TRANSFORMERS
61869-5 ADDITIONAL REQUIREMENTS FOR 60044-5
CAPACITIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR
61869-6 61869-7 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS ADDITIONAL REQUIREMENTS FOR
61869-8 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
61869-9 DIGITAL INTERFACE FOR INSTRUMENT
TRANSFORMERS
61869-10 ADDITIONAL REQUIREMENTS FOR LOW-
POWER PASSIVE CURRENT
TRANSFORMERS
61869-11 ADDITIONAL REQUIREMENTS FOR LOW- 60044-7
POWER PASSIVE VOLTAGE
TRANSFORMERS
61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED LOW-
POWER PASSIVE TRANSFORMERS
61869-13 STAND ALONE MERGING UNIT
61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 5 –

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

stability date indicated on the IEC website 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.
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SIST EN IEC 61869-15:2019
– 6 – IEC 61869-15:2018 © IEC 2018
INTRODUCTION

This document applies to voltage transformers (VT) intended to be used in DC applications

with the following functions:
• measure DC voltage (with significant harmonics);
• withstand DC voltage.
Two main technologies of DC converters exist today: LCC and VSC
• Line-commutated converters (LCC) are based on thyristor converters. They are

characterized by a single direction of current flow, and a voltage polarity reversal

possibility. Significant voltage and current harmonics exist up to frequencies of about

3 kHz to 4 kHz.
• Voltage source converters (VSC) are based on transistor converters. They are

characterized by a bi-directional current flow and a single voltage polarity. Voltage and

current harmonics exist up to frequencies of about 20 kHz.
The position of the DCVTs on the DC system is illustrated in Figure 1501.
Figure 1501 – Position of the DCVT’s in the DC scheme

Table 1501 gives an overview of the voltage waveshape as well as the main characteristics of

the VT.
Table 1501 – Voltage on DCVT’s
Voltage Characteristics
Pure DC application
High-accuracy measurement
Harmonics measurement
Metering, control and protection purpose
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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 7 –

The actual technology used for DCVT’s are resistive voltage dividers (with or without

additional capacitance). However, other technologies could be used in the future (for

example, optical voltage sensors).

This document includes some specific requirements applicable to resistive voltage dividers,

but can be applied to any technology.
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SIST EN IEC 61869-15:2019
– 8 – IEC 61869-15:2018 © IEC 2018
INSTRUMENT TRANSFORMERS –
Part 15: Additional requirements for
voltage transformers for DC applications
1 Scope

This part of IEC 61869 provides all requirements specific to voltage transformers to be used

in DC applications (DCVTs), whatever the technology used. The output signal can be

analogue or digital.

It is applicable to newly manufactured voltage transformers used for measuring, protection

and/or control applications in DC power systems with a rated voltage above 1,5 kV.

This document covers passive voltage dividers as well as active voltage transformers, used

for measurement, control and protection.

The general configuration of a single-pole low-power instrument transformer is described in

Figure 601 of IEC 61869-6:2016.
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.
Clause 2 of IEC 61869-6:2016 is applicable, with the following additions:

IEC TS 60815-4:2016, Selection and dimensioning of high-voltage insulators intended for use

in polluted conditions – Part 4: Insulators for DC systems

IEC TS 61245, Artificial pollution tests on high-voltage ceramic and glass insulators to be

used on DC systems
IEC 61869-1:2007, Instrument transformers – Part 1: General requirements

IEC 61869-6:2016, Instrument transformers – Part 6: Additional general requirements for low-

power instrument transformers

IEC 61869-9:2016, Instrument transformers – Part 9: Digital interface for instrument

transformers
3 Terms, definitions, abbreviated terms and symbols

For the purposes of this document, the terms and definitions given in Clause 3 of IEC 61869-

1:2007, of IEC 61869-6:2016 and of IEC 61869-9:2016 are applicable with the following

additions and modifications.

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

addresses:
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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 9 –
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 General definitions
3.1.1501
instrument transformer for DC application

instrument transformer intended to be used in DC applications with at least one of the

following functions:
• measure DC current or DC voltage (with significant harmonics);
• withstand DC voltage.
3.1.1502
voltage transformer for DC application
DCVT

instrument transformer for DC application in which the secondary signal, under normal

conditions of use, is substantially proportional to the primary voltage
3.2 Definitions related to dielectric ratings
3.2.2
highest voltage for equipment
Definition 3.2.2 of IEC 61869-1:2007 is replaced by the following one:

highest value of DC voltage for which the equipment is designed to operate continuously, in

respect of its insulation as well as other characteristics that relate to this voltage

3.3 Definitions related to current ratings
3.3.1501
maximum peak fault current

maximum peak value of current occurring during a fault condition of the DC power system

3.4 Definitions related to accuracy
3.4.1501
absolute error

error (expressed in V) that a voltage transformer introduces into the measurement and which

arises from the fact that the actual transformation ratio is not equal to the rated transformation

ratio
Note 1 to entry: The absolute error is defined by the following formula:
ε = K ⋅ U – U
V r s p
where
K is the rated transformation ratio;
U is the DC value of the actual primary voltage in steady state;
U is the DC value of the output voltage.
3.5 Definitions related to other ratings
3.5.1501
step response

duration between the instant when the measurand (or quantity supplied) is subjected to a

specified abrupt change and the instant when the indication (or quantity supplied) reaches,

and remains within specified limits of, its final steady-state value
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Note 1 to entry: See graphical explanation in Figure 1502.
For periodic behaviour
For aperiodic behaviour
u Input variable
U Initial value of the input variable
U Step height of the input variable
v Output variable
V , V Steady-state values before and after application of the step
0 ∞
v Overshoot
Specified tolerance limit
2 ∆v
T Step response time
T Settling time
T Dead time
Figure 1502 – Typical step responses of a system
Note 2 to entry: The dead time includes the delay time.

[SOURCE: IEC 60050-311:2001, 311-06-04 and IEC 60050-351:2013, 351-45-27, modified –

Notes to entry of the sources have been deleted and a new Note 1 to entry has been added.]

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IEC 61869-15:2018 © IEC 2018 – 11 –
3.5.1502
step response time

for a step response, the duration of the time interval between the instant of the step change of

an input variable and the instant when the output variable reaches for the first time a specified

percentage of the difference between the final and the initial steady-state values

Note 1 to entry: The step response time includes the delay time of the voltage transformer.

[SOURCE: IEC 60050-351:2013, 351-45-36 modified – Note 1 to entry of the source has been

deleted and a new Note 1 to entry has been added, and the symbol has been added.]

3.5.1503
settling time

for a step response, the duration of the time interval between the instant of the step change of

an input variable and the instant when the difference between the step response and their

steady-state value remains smaller than the transient value tolerance

Note 1 to entry: The settling time includes the delay time of the voltage transformer.

[SOURCE: IEC 60050-351:2013, 351-45-37 modified – Note 1 to entry of the source has been

deleted and a new Note 1 to entry has been added, and the symbol has been added.]

3.5.1504
overshoot

for a step response of a transfer element, the maximum transient deviation from the final

steady-state value of the output variable, usually expressed in percent of the difference

between the final and the initial steady-state values and for reference-variable step response

or disturbance-variable step response of a control system the maximum transient deviation

from the desired value

[SOURCE: IEC 60050-351:2013, 351-45-38, modified – Note 1 to entry has been deleted and

the symbol has been replaced.]
3.7 Index of abbreviated terms and symbols
The table in 3.7 of IEC 61869-6:2016 is replaced by the following one:
DCVT voltage transformer for DC application
F mechanical load
I maximum supply current
amax
I rated supply current
I maximum peak fault current
IT instrument transformer
K actual transformation ratio
K rated transformation ratio
R rated burden
t delay time
t rated delay time
T settling time
T step response time
T dead time
U auxiliary power supply voltage
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U highest voltage for equipment
U rated primary voltage
U rated secondary voltage
v overshoot
ratio error
ε absolute error
5 Ratings
5.1 General
Subclause 5.1 of IEC 61869-1:2007 is replaced by the following one:

If applicable, the ratings of voltage transformers, including their auxiliary equipment, shall be

selected from the following ones:
• highest voltage for equipment (U
• rated primary voltage (U );
• rated delay time (t );
• rated secondary voltage (U );
• insulation level;
• rated burden (R );
• rated accuracy class;
• rated step response time (T ).

The rating applies at the standardized reference atmosphere (temperature 20 °C, pressure

101,3 kPa, and humidity 11 g/m ) as specified in IEC 60071-1.

NOTE The ratings are specified by the purchaser depending on the characteristics of the whole DC system

application.
5.2 Highest voltage for equipment
There are no standard values for highest voltage for equipment.
However, a tentative list of standard values is given in Annex 15A.
5.3 Rated insulation levels
5.3.1 General
Subclause 5.3.1 from IEC 61869-1:2007 is replaced by the following one:

The standard values of insulation level of IEC 60071-1 are not applicable to DC systems.

Methods of calculation for applied dielectric test voltages are given in the relevant clauses of

this document.

Additionally, indication for impulse withstand voltage values are given in Annex 15A.

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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 13 –
5.3.3 Other requirements for insulation of primary terminals
5.3.3.1 Partial discharges
Subclause 5.3.3.1 of IEC 61869-1:2007 is replaced by the following one:

The partial discharge level measured during the power-frequency voltage withstand test, shall

not exceed the limits specified in Table 3.
Table 3 – Partial discharge test voltages and permissible levels
Maximum permissible PD level
PD test voltage
(r.m.s.)
Type of insulation
immersed in liquid or gas solid
1,5 U /√2 10 50
1,2 U /√2 5 20
5.4 Rated frequency
Subclause 5.4 of IEC 61869-1:2007 is replaced by the following one:
The rated frequency is equal to 0 (which means DC).
5.5 Rated output
5.5.602 Standard values for the rated delay time (t )
Subclause 5.5.602 of IEC 61869-6:2016 is replaced by the following one:
The standard values for rated delay time are:
5 µs – 25 µs – 100 µs
In the case of a pure passive DCVT, the rated delay time is 0
...

SLOVENSKI STANDARD
SIST EN IEC 61869-15:2019
01-oktober-2019
Merilni transformatorji - 15. del: Posebne zahteve za napetostne transformatorje
(IEC 61869-15:2018)

Instrument Transformers - Part 15: Specific Requirements for DC Voltage Transformers

(IEC 61869-15:2018)
Messwandler - Teil 15: Besondere Anforderungen für Gleichspannungswandler (IEC
61869-15:2018)
Transformateurs de mesure - Part 15: Exigences supplémentaires concernant les
transformateurs de tension pour CC (IEC 61869-15:2018)
Ta slovenski standard je istoveten z: EN IEC 61869-15:2019
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN IEC 61869-15:2019 en

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

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SIST EN IEC 61869-15:2019
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SIST EN IEC 61869-15:2019
EUROPEAN STANDARD EN IEC 61869-15
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 17.220.20
English Version
Instrument transformers - Part 15: Additional requirements for
voltage transformers for DC applications
(IEC 61869-15:2018)

Transformateurs de mesure - Partie 15: Exigences Messwandler - Teil 15: Besondere Anforderungen für

supplémentaires concernant les transformateurs de tension Gleichspannungswandler
pour application en courant continu (IEC 61869-15:2018)
(IEC 61869-15:2018)

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 61869-15:2019 E
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SIST EN IEC 61869-15:2019
EN IEC 61869-15:2019 (E)
European foreword

The text of document 38/561/FDIS, future edition 1 of IEC 61869-15, prepared by IEC/TC 38

"Instrument transformers" was submitted to the IEC-CENELEC parallel vote and approved by

CENELEC as EN IEC 61869-15:2019.
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.

Endorsement notice

The text of the International Standard IEC 61869-15:2018 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60358-1:2012 NOTE Harmonized as EN 60358-1:2012 (not modified)
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SIST EN IEC 61869-15:2019
EN IEC 61869-15:2019 (E)
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:
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 61869-1 (mod) 2007 Instrument transformers - Part 1: General EN 61869-1 2009

requirements
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
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SIST EN IEC 61869-15:2019
IEC 61869-15
Edition 1.0 2018-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 15: Additional requirements for voltage transformers for DC applications
Transformateurs de mesure –
Partie 15: Exigences supplémentaires concernant les transformateurs de
tension pour application en courant continu
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5804-0

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 IEC 61869-15:2019
– 2 – IEC 61869-15:2018 © IEC 2018
CONTENTS

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

INTRODUCTION ..................................................................................................................... 6

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

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

3 Terms, definitions, abbreviated terms and symbols .......................................................... 8

5 Ratings .......................................................................................................................... 12

6 Design and construction ................................................................................................ 15

7 Tests ............................................................................................................................. 20

Annex 15A (informative) Proposed rated insulation level applicable to voltage

transformers for DC application............................................................................................. 34

Bibliography .......................................................................................................................... 35

Figure 1501 – Position of the DCVT’s in the DC scheme ......................................................... 6

Figure 1502 – Typical step responses of a system ................................................................ 10

Figure 1503 – Accuracy limits of a DCVT .............................................................................. 14

Figure 1504 – RC divider with low-voltage part outside the main housing ............................. 25

Figure 1505 – Connection for voltage withstand test of the external low voltage part of

a DCVT ................................................................................................................................. 26

Figure 1506 – Polarity reversal test profile ............................................................................ 27

Figure 1507– Measurement of the step response time .......................................................... 29

Table 1501 – Voltage on DCVT’s ............................................................................................ 6

Table 3 – Partial discharge test voltages and permissible levels ........................................... 13

Table 1502 – Limits of ratio error for DCVT (classes from 0,1 to 3) ...................................... 14

Table 7 – Static withstand test loads ..................................................................................... 16

Table 8 – Arc fault duration and performance criteria ............................................................ 17

Table 1503 – Markings of terminals ...................................................................................... 18

Table 1504 – Rating plate marking for common rating plate .................................................. 19

Table 1505 – Rating plate marking for each secondary converter ......................................... 19

Table 1506 – Rating plate marking for auxiliary power supply ............................................... 20

Table 10 – List of tests.......................................................................................................... 21

Table 15A.1 – Proposed rated primary terminal insulation levels for voltage

transformers for DC application............................................................................................. 34

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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 15: Additional requirements for
voltage 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, 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 61869-15 has been prepared by IEC technical committee 38:

Instrument transformers.
The text of this standard is based on the following documents:
FDIS Report on voting
38/561/FDIS 38/566/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

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

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A list of all parts in the IEC 61869 series, published under the general title Instrument

transformers, can be found on the IEC website.

This Part 15 is to be used in conjunction with IEC 61869-1:2007, General Requirements, and

IEC 61869-6:2016, Additional general requirements for low-power instrument transformers –

however, the reader is encouraged to use the most recent edition.
This Part 15 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and
supplements or modifies their corresponding clauses.

When a subclause of Part 1 or Part 6 is not mentioned in this Part 15, that subclause applies.

When this standard states "addition", "modification" or "replacement", the relevant text in

Part 1 or Part 6 is to be adapted accordingly.

For additional clauses, subclauses, figures, tables, annexes or notes, the following numbering

system is used:

• clauses, subclauses, tables, figures and notes that are numbered starting from 1501 are

additional to those in Part 1 and Part 6;
• additional annexes are lettered 15A, 15B, etc.

An overview of the planned set of standards at the date of publication of this document is

given below. The updated list of standards issued by IEC TC 38 is available at the website:

www.iec.ch.
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
61869-1 61869-2 ADDITIONAL REQUIREMENTS FOR 60044-1
CURRENT TRANSFORMERS 60044-6
GENERAL
REQUIREMENTS
61869-3 ADDITIONAL REQUIREMENTS FOR 60044-2
INDUCTIVE VOLTAGE TRANSFORMERS
61869-4 ADDITIONAL REQUIREMENTS FOR 60044-3
COMBINED TRANSFORMERS
61869-5 ADDITIONAL REQUIREMENTS FOR 60044-5
CAPACITIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR
61869-6 61869-7 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS ADDITIONAL REQUIREMENTS FOR
61869-8 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
61869-9 DIGITAL INTERFACE FOR INSTRUMENT
TRANSFORMERS
61869-10 ADDITIONAL REQUIREMENTS FOR LOW-
POWER PASSIVE CURRENT
TRANSFORMERS
61869-11 ADDITIONAL REQUIREMENTS FOR LOW- 60044-7
POWER PASSIVE VOLTAGE
TRANSFORMERS
61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED LOW-
POWER PASSIVE TRANSFORMERS
61869-13 STAND ALONE MERGING UNIT
61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 5 –

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

stability date indicated on the IEC website 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.
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SIST EN IEC 61869-15:2019
– 6 – IEC 61869-15:2018 © IEC 2018
INTRODUCTION

This document applies to voltage transformers (VT) intended to be used in DC applications

with the following functions:
• measure DC voltage (with significant harmonics);
• withstand DC voltage.
Two main technologies of DC converters exist today: LCC and VSC
• Line-commutated converters (LCC) are based on thyristor converters. They are

characterized by a single direction of current flow, and a voltage polarity reversal

possibility. Significant voltage and current harmonics exist up to frequencies of about

3 kHz to 4 kHz.
• Voltage source converters (VSC) are based on transistor converters. They are

characterized by a bi-directional current flow and a single voltage polarity. Voltage and

current harmonics exist up to frequencies of about 20 kHz.
The position of the DCVTs on the DC system is illustrated in Figure 1501.
Figure 1501 – Position of the DCVT’s in the DC scheme

Table 1501 gives an overview of the voltage waveshape as well as the main characteristics of

the VT.
Table 1501 – Voltage on DCVT’s
Voltage Characteristics
Pure DC application
High-accuracy measurement
Harmonics measurement
Metering, control and protection purpose
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The actual technology used for DCVT’s are resistive voltage dividers (with or without

additional capacitance). However, other technologies could be used in the future (for

example, optical voltage sensors).

This document includes some specific requirements applicable to resistive voltage dividers,

but can be applied to any technology.
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SIST EN IEC 61869-15:2019
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INSTRUMENT TRANSFORMERS –
Part 15: Additional requirements for
voltage transformers for DC applications
1 Scope

This part of IEC 61869 provides all requirements specific to voltage transformers to be used

in DC applications (DCVTs), whatever the technology used. The output signal can be

analogue or digital.

It is applicable to newly manufactured voltage transformers used for measuring, protection

and/or control applications in DC power systems with a rated voltage above 1,5 kV.

This document covers passive voltage dividers as well as active voltage transformers, used

for measurement, control and protection.

The general configuration of a single-pole low-power instrument transformer is described in

Figure 601 of IEC 61869-6:2016.
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.
Clause 2 of IEC 61869-6:2016 is applicable, with the following additions:

IEC TS 60815-4:2016, Selection and dimensioning of high-voltage insulators intended for use

in polluted conditions – Part 4: Insulators for DC systems

IEC TS 61245, Artificial pollution tests on high-voltage ceramic and glass insulators to be

used on DC systems
IEC 61869-1:2007, Instrument transformers – Part 1: General requirements

IEC 61869-6:2016, Instrument transformers – Part 6: Additional general requirements for low-

power instrument transformers

IEC 61869-9:2016, Instrument transformers – Part 9: Digital interface for instrument

transformers
3 Terms, definitions, abbreviated terms and symbols

For the purposes of this document, the terms and definitions given in Clause 3 of IEC 61869-

1:2007, of IEC 61869-6:2016 and of IEC 61869-9:2016 are applicable with the following

additions and modifications.

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

addresses:
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SIST EN IEC 61869-15:2019
IEC 61869-15:2018 © IEC 2018 – 9 –
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1 General definitions
3.1.1501
instrument transformer for DC application

instrument transformer intended to be used in DC applications with at least one of the

following functions:
• measure DC current or DC voltage (with significant harmonics);
• withstand DC voltage.
3.1.1502
voltage transformer for DC application
DCVT

instrument transformer for DC application in which the secondary signal, under normal

conditions of use, is substantially proportional to the primary voltage
3.2 Definitions related to dielectric ratings
3.2.2
highest voltage for equipment
Definition 3.2.2 of IEC 61869-1:2007 is replaced by the following one:

highest value of DC voltage for which the equipment is designed to operate continuously, in

respect of its insulation as well as other characteristics that relate to this voltage

3.3 Definitions related to current ratings
3.3.1501
maximum peak fault current

maximum peak value of current occurring during a fault condition of the DC power system

3.4 Definitions related to accuracy
3.4.1501
absolute error

error (expressed in V) that a voltage transformer introduces into the measurement and which

arises from the fact that the actual transformation ratio is not equal to the rated transformation

ratio
Note 1 to entry: The absolute error is defined by the following formula:
ε = K ⋅ U – U
V r s p
where
K is the rated transformation ratio;
U is the DC value of the actual primary voltage in steady state;
U is the DC value of the output voltage.
3.5 Definitions related to other ratings
3.5.1501
step response

duration between the instant when the measurand (or quantity supplied) is subjected to a

specified abrupt change and the instant when the indication (or quantity supplied) reaches,

and remains within specified limits of, its final steady-state value
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Note 1 to entry: See graphical explanation in Figure 1502.
For periodic behaviour
For aperiodic behaviour
u Input variable
U Initial value of the input variable
U Step height of the input variable
v Output variable
V , V Steady-state values before and after application of the step
0 ∞
v Overshoot
Specified tolerance limit
2 ∆v
T Step response time
T Settling time
T Dead time
Figure 1502 – Typical step responses of a system
Note 2 to entry: The dead time includes the delay time.

[SOURCE: IEC 60050-311:2001, 311-06-04 and IEC 60050-351:2013, 351-45-27, modified –

Notes to entry of the sources have been deleted and a new Note 1 to entry has been added.]

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3.5.1502
step response time

for a step response, the duration of the time interval between the instant of the step change of

an input variable and the instant when the output variable reaches for the first time a specified

percentage of the difference between the final and the initial steady-state values

Note 1 to entry: The step response time includes the delay time of the voltage transformer.

[SOURCE: IEC 60050-351:2013, 351-45-36 modified – Note 1 to entry of the source has been

deleted and a new Note 1 to entry has been added, and the symbol has been added.]

3.5.1503
settling time

for a step response, the duration of the time interval between the instant of the step change of

an input variable and the instant when the difference between the step response and their

steady-state value remains smaller than the transient value tolerance

Note 1 to entry: The settling time includes the delay time of the voltage transformer.

[SOURCE: IEC 60050-351:2013, 351-45-37 modified – Note 1 to entry of the source has been

deleted and a new Note 1 to entry has been added, and the symbol has been added.]

3.5.1504
overshoot

for a step response of a transfer element, the maximum transient deviation from the final

steady-state value of the output variable, usually expressed in percent of the difference

between the final and the initial steady-state values and for reference-variable step response

or disturbance-variable step response of a control system the maximum transient deviation

from the desired value

[SOURCE: IEC 60050-351:2013, 351-45-38, modified – Note 1 to entry has been deleted and

the symbol has been replaced.]
3.7 Index of abbreviated terms and symbols
The table in 3.7 of IEC 61869-6:2016 is replaced by the following one:
DCVT voltage transformer for DC application
F mechanical load
I maximum supply current
amax
I rated supply current
I maximum peak fault current
IT instrument transformer
K actual transformation ratio
K rated transformation ratio
R rated burden
t delay time
t rated delay time
T settling time
T step response time
T dead time
U auxiliary power supply voltage
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U highest voltage for equipment
U rated primary voltage
U rated secondary voltage
v overshoot
ratio error
ε absolute error
5 Ratings
5.1 General
Subclause 5.1 of IEC 61869-1:2007 is replaced by the following one:

If applicable, the ratings of voltage transformers, including their auxiliary equipment, shall be

selected from the following ones:
• highest voltage for equipment (U
• rated primary voltage (U );
• rated delay time (t );
• rated secondary voltage (U );
• insulation level;
• rated burden (R );
• rated accuracy class;
• rated step response time (T ).

The rating applies at the standardized reference atmosphere (temperature 20 °C, pressure

101,3 kPa, and humidity 11 g/m ) as specified in IEC 60071-1.

NOTE The ratings are specified by the purchaser depending on the characteristics of the whole DC system

application.
5.2 Highest voltage for equipment
There are no standard values for highest voltage for equipment.
However, a tentative list of standard values is given in Annex 15A.
5.3 Rated insulation levels
5.3.1 General
Subclause 5.3.1 from IEC 61869-1:2007 is replaced by the following one:

The standard values of insulation level of IEC 60071-1 are not applicable to DC systems.

Methods of calculation for applied dielectric test voltages are given in the relevant clauses of

this document.

Additionally, indication for impulse withstand voltage values are given in Annex 15A.

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5.3.3 Other requirements for insulation of primary terminals
5.3.3.1 Partial discharges
Subclause 5.3.3.1 of IEC 61869-1:2007 is replaced by the following one:

The partial discharge level measured during the power-frequency voltage withstand test, shall

not exceed the limits specified in Table 3.
Table 3 – Partial discharge test voltages and permissible levels
Maximum permissible PD level
PD test voltage
(r.m.s.)
Type of insulation
immersed in liquid or gas solid
1,5 U /√2 10 50
1,2 U /√2 5 20
5.4 Rated frequency
Subclause 5.4 of IEC 61869-1:2007 is replaced by the following one:
The rated frequency is equal to 0 (which means DC).
5.5 Rated output
5.5.602 Standard values for the rated delay time (t )
Subclause 5.5.602 of IEC 61869-6:2016 is replaced by the following one:
The standard values for rated delay time are:
5 µs – 25 µs – 100 µs
In the case of a pure passive
...

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