Instrument transformers - Part 10: Additional requirements for low-power passive current transformers

IEC 61869-10:2017 is a product standard and covers only additional requirements for low-power passive current transformers. The product standard for low-power passive current transformers comprises IEC 61869-1, together with IEC 61869-6 and this document with specific requirements. This document is applicable to newly manufactured low-power passive current transformers with analogue output for use with electrical measuring instruments or electrical protective devices having a rated frequency from 15 Hz to 100 Hz. This document covers low-power passive current transformers used for measurement or protection and multi-purpose low-power passive current transformers used for both measurement and protection. This first edition of IEC 61869-10, together with IEC 61869-1, IEC 61869-6, IEC 61869-8 and IEC 61869-9, cancels and replaces the first edition of IEC 60044-8, published in 2002. This edition constitutes a technical revision. The technical changes concern IEC TC 38's decision to restructure the whole set of stand-alone standards in the IEC 60044 series and transform it into a new set of standards composed of general requirements documents and specific requirements documents.

Messwandler - Teil 10: Zusätzliche Anforderungen für Kleinsignal-Stromwandler

Transformateurs de mesure - Partie 10: Exigences supplémentaires concernant les transformateurs de courant passifs de faible puissance

L'IEC 61869-10:2017 est une norme de produit et couvre seulement les exigences supplémentaires concernant les transformateurs de courant passifs de faible puissance. La norme de produit sur les transformateurs de courant passifs de faible puissance est constituée de l'IEC 61869-1, à laquelle s'ajoutent l'IEC 61869-6 et le présent document portant sur les exigences spécifiques. Le présent document s'applique aux transformateurs de courant passifs de faible puissance à sortie analogique fabriqués récemment et destinés à être utilisés avec des appareils de mesure électriques ou des dispositifs électriques de protection présentant une fréquence assignée comprise entre 15 Hz et 100 Hz. Le présent document couvre les transformateurs de courant passifs de faible puissance utilisés pour la mesure ou la protection, ainsi que les transformateurs de courant passifs de faible puissance polyvalents utilisés à la fois pour la mesure et la protection. Cette première édition de l'IEC 61869-10 conjointement avec l'IEC 61869-1, l'IEC 61869-6, l'IEC 61869-8 et l'IEC 61869-9 annulent et remplacent la première édition de l'IEC 60044-8 publiée en 2002. Cette édition constitue une révision technique. Les révisions techniques concernent la décision du TC 38 de l'IEC de restructurer l'ensemble des normes indépendantes de la série IEC 60044 et d'en faire un nouvel ensemble de normes composé de documents portant sur les exigences générales et de documents portant sur des exigences spécifiques.

Instrumentni transformatorji - 10. del: Dodatne zahteve za pasivne tokovne transformatorje majhne moči (IEC 61869-10:2017)

Ta del standarda IEC 61869 je standard za izdelek in obsega le dodatne zahteve za pasivni tokovni transformator z nizko močjo. Standard za izdelek za pasivne tokovne transformatorje z nizko močjo sestavlja standard IEC 61869-1 skupaj s standardom IEC 61869-6 in tem dokumentom s specifičnimi zahtevami.
Ta dokument se uporablja za nove pasivne tokovne transformatorje z nizko močjo in analognim izhodom za uporabo z električnimi merilnimi instrumenti ali električnimi zaščitnimi napravami z nazivno frekvenco od 15 Hz do 100 Hz.
Ta dokument obsega pasivne tokovne transformatorje z nizko močjo, ki se uporabljajo za merjenje ali zaščito, in večnamenske pasivne tokovne transformatorje z nizko močjo, ki se uporabljajo tako za merjenje kot tudi za zaščito.
Podtočka 5.6.1001 obsega zahteve glede natančnosti, ki so potrebne za pasivne tokovne transformatorje z nizko močjo za uporabo z električnimi merilnimi inštrumenti.
Podtočka 5.6.1002 obsega zahteve glede natančnosti, ki so potrebne za pasivne tokovne transformatorje z nizko močjo za uporabo z električnimi varnostnimi releji in zlasti za oblike zaščite, pri katerih glavna zahteva določa vzdrževanje natančnosti do večkratnika naznačenega toka. Če je zahtevano, je v točki 5.6.1002 navedena natančnost prehodne napetosti pasivnih tokovnih transformatorjev z nizko močjo med okvaro.
Pasivni tokovni transformatorji z nizko močjo imajo le analogni napetostni izhod (za digitalni izhod ali za tehnologijo, ki uporablja kakršno koli vrsto aktivnih elektronskih komponent, glejte standard IEC 61869-82). Takšni pasivni tokovni transformatorji z nizko močjo lahko vključujejo sekundarni kabel za signal (kabel za prenos). Načelo delovanja pasivnega tokovnega transformatorja z odvedeno nizko močjo, ki uporablja tuljave z zračnim jedrom (tuljave Rogowski), je navedeno v Dodatku 10B, načelo delovanja pasivnih tokovnih transformatorjev s sorazmerno nizko močjo, ki uporablja tuljave z železnim jedrom in integriranim navitjem, je navedeno v Dodatku 10C.

General Information

Status
Published
Publication Date
15-Mar-2018
Drafting Committee
Current Stage
6060 - Document made available
Due Date
12-Sep-2017

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SLOVENSKI STANDARD
SIST EN IEC 61869-10:2018
01-maj-2018
Instrumentni transformatorji - 10. del: Dodatne zahteve za pasivne tokovne
transformatorje majhne moči (IEC 61869-10:2017)

Instrument transformers - Part 10: Additional requirements for low-power passive current

transformers (IEC 61869-10:2017)
Ta slovenski standard je istoveten z: EN IEC 61869-10:2018
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN IEC 61869-10:2018 en

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

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SIST EN IEC 61869-10:2018
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SIST EN IEC 61869-10:2018
EUROPEAN STANDARD EN IEC 61869-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 17.220.20
English Version
Instrument transformers - Part 10: Additional requirements for
low-power passive current transformers
(IEC 61869-10:2017)

Transformateurs de mesure - Partie 10: Exigences Messwandler - Teil 10: Zusätzliche Anforderungen für

supplémentaires concernant les transformateurs de courant Kleinsignal-Stromwandler

passifs de faible puissance (IEC 61869-10:2017)
(IEC 61869-10:2017)

This European Standard was approved by CENELEC on 2018-01-17. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61869-10:2018 E
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SIST EN IEC 61869-10:2018
EN IEC 61869-10:2018 (E)
European foreword

The text of document 38/550/FDIS, future edition 1 of IEC 61869-10, prepared by IEC/TC 38

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

CENELEC as EN IEC 61869-10:2018.
The following dates are fixed:
(dop) 2018-10-17
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-01-17
standards conflicting with the
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 61869-10:2017 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 61869-10:2018
EN IEC 61869-10:2018 (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.
Publication Year Title EN/HD Year
IEC 60059 - IEC standard current ratings EN 60059 -
IEC 61869-6 2016 Instruments transformers -- Part 6: EN 61869-6 2016
Additional general requirements for Low
Power Instrument Transformers
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SIST EN IEC 61869-10:2018
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SIST EN IEC 61869-10:2018
IEC 61869-10
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 10: Additional requirements for low-power passive current transformers
Transformateurs de mesure –
Partie 10: Exigences supplémentaires concernant les transformateurs de
courant passifs de faible puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5129-4

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 61869-10:2018
– 2 – IEC 61869-10:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

3.1 General definitions ................................................................................................ 10

3.4 Definitions related to accuracy .............................................................................. 10

3.7 Index of abbreviations ........................................................................................... 13

5 Ratings .......................................................................................................................... 13

5.3 Rated insulation levels and voltages ..................................................................... 13

5.5 Rated output ......................................................................................................... 14

5.6 Rated accuracy class ............................................................................................ 14

5.1001 Standard values for rated primary current (I )...................................................... 16

5.1002 standard values for rated extended primary current factor (K ) .......................... 16

pcr

5.1003 Standard value of rated continuous thermal current (I ) ..................................... 16

cth

5.1004 Standard values of rated secondary voltage (U ) ................................................. 17

5.1005 Short-time current ratings ..................................................................................... 17

5.1006 Rated phase offset (φ ) ....................................................................................... 17

6 Design and construction ................................................................................................ 17

6.11 Electromagnetic compatibility (EMC) ..................................................................... 17

6.13 Markings ............................................................................................................... 17

6.601 Requirements for optical transmitting system and optical output link ..................... 19

6.602 Requirements for electrical transmitting system and electrical wires for

output link ............................................................................................................. 19

6.603 Signal-to-noise ratio .............................................................................................. 19

6.604 Failure detection and maintenance announcement ................................................ 19

6.605 Operability ............................................................................................................ 19

6.606 Reliability and dependability ................................................................................. 19

6.607 Vibrations ............................................................................................................. 20

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

7.1 General ................................................................................................................. 20

7.2 Type tests ............................................................................................................. 21

7.4 Special tests ......................................................................................................... 25

601 Information to be given with enquiries, tenders and orders ............................................ 25

601.1 Designation ........................................................................................................... 25

601.2 Dependability ........................................................................................................ 26

Annex 10A (informative) Designation of accuracy class when using the corrected

transformation ratio and ratio correction factor ...................................................................... 27

10A.1 General ................................................................................................................. 27

10A.2 Designation of accuracy class based on rated transformation ratio ....................... 28

10A.3 Designation of accuracy class based on individual ratio correction factor .............. 28

10A.4 Example of application .......................................................................................... 28

Annex 10B (informative) Principle of operation of Rogowski coils ......................................... 32

10B.1 General ................................................................................................................. 32

10B.2 Principle of operation ............................................................................................ 32

10B.3 Designs ................................................................................................................ 33

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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 3 –

10B.4 Accuracy ............................................................................................................... 33

10B.5 Frequency dependence and response ................................................................... 35

Annex 10C (informative) Principle of operation of low-power iron core current

transformers (proportional LPCT) .......................................................................................... 37

10C.1 General ................................................................................................................. 37

10C.2 Principle ............................................................................................................... 37

10C.3 Accuracy ............................................................................................................... 38

Annex 10D (normative) Test for accuracy with respect to the positioning of the primary

conductor .............................................................................................................................. 39

10D.1 General ................................................................................................................. 39

10D.2 Designation of accuracy class extension ............................................................... 39

10D.3 Test procedure ...................................................................................................... 40

Bibliography .......................................................................................................................... 42

Figure 1001 – General block diagram of a single-phase low-power passive current

transformer ............................................................................................................................. 8

Figure 1002 – Marking of terminals ....................................................................................... 18

Figure 1003 – Test set up for impact of magnetic field from other phases ............................. 24

Figure 10A.1 – Accuracy class designation improved based on individual ratio

correction factor CF ............................................................................................................. 28

Figure 10A.2 – Accuracy test of passive LPCT ...................................................................... 29

Figure 10A.3 – Accuracy class of 1 % designated based on rated transformation ratio .......... 30

Figure 10A.4 – Accuracy class of 0,1 % designated based on using the ratio correction

factor and corrected transformation ratio ............................................................................... 31

Figure 10B.1 – Rogowski coil Equivalent Circuits .................................................................. 35

Figure 10B.2 – Integrated and non-integrated Rogowski coil output signals .......................... 35

Figure 10B.3 – Rogowski coil frequency dependence test ..................................................... 36

Figure 10C.1 – Principle of iron core current transformer ...................................................... 37

Figure 10C.2 – Equivalent circuit of the iron core current transformer with voltage

output ................................................................................................................................... 38

Figure 10D.1 – Definition of the angle between the primary conductor and the LPCT ............ 39

d = d ......................................................................................................................... 40

min max

Figure 10D.2 – Illustration of the primary conductor position according to the position

factor .................................................................................................................................... 40

Figure 10D.3 – Accuracy measurement test set up ............................................................... 41

Table 1001 – Limits of ratio error and phase error for measuring passive LPCT ................... 15

Table 1002 – Limits of errors ................................................................................................ 16

Table 1003 – Pin assignment for RJ45 connectors used in passive LPCT ............................. 19

Table 10 – List of tests.......................................................................................................... 20

Table 1004 – Designation of a passive LPCT ........................................................................ 26

Table 10A.1 – Ratio, ratio error based on mean value, and corresponding primary

current .................................................................................................................................. 29

Table 10A.2 – Measured ratio error, correction factor and ratio error based on ratio

correction factor for five passive LPCT ................................................................................. 30

Table 10D.1 – Limits for the position of the primary conductor with respect to the

passive LPCT ....................................................................................................................... 39

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SIST EN IEC 61869-10:2018
– 4 – IEC 61869-10:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 10: Additional requirements
for low-power passive current transformers
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

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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 61869-10 has been prepared IEC technical committee 38:

Instrument transformers.

This first edition of IEC 61869-10, together with IEC 61869-1, IEC 61869-6, IEC 61869-8 and

IEC 61869-9, cancels and replaces the first edition of IEC 60044-8, published in 2002 . This

edition constitutes a technical revision.

The technical changes concern IEC TC 38's decision to restructure the whole set of stand-

alone standards in the IEC 60044 series and transform it into a new set of standards

composed of general requirements documents and specific requirements documents.
_____________

IEC 60044-8 will eventually be replaced by the IEC 61869 series, but until all the relevant parts of the

IEC 61869 series will be published, this standard is still in force.
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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
38/550/FDIS 38/551/RVD

Full information on the voting for the approval of this part of IEC 61869 can be found in the

report on voting indicated in the above table.

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

This standard is Part 10 of IEC 61869, published under the general title Instrument

transformers.

This Part 10 is to be read in conjunction with, and is based on, 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 of

these documents.
This Part 10 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and
supplements or modifies the corresponding clauses.

When a particular subclause of Part 1or part 6 is not mentioned in this Part 10, that subclause

applies. When this part of IEC 61869 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 note, the following numbering

system is used:

– clauses, subclauses, tables, figures and notes that are numbered starting from 1001 are

additional to those in Part 1 and Part 6;
– additional annexes are lettered 10A, 10B, 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 on the IEC

website.
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SIST EN IEC 61869-10:2018
– 6 – IEC 61869-10:2017 © IEC 2017
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
IEC 61869-2 ADDITIONAL REQUIREMENTS FOR IEC 60044-1
CURRENT TRANSFORMERS
IEC 60044-6
IEC 61869-3 ADDITIONAL REQUIREMENTS FOR IEC 60044-2
INDUCTIVE VOLTAGE
TRANSFORMERS
IEC 61869-4 ADDITIONAL REQUIREMENTS FOR IEC 60044-3
COMBINED TRANSFORMERS
IEC 61869-5 ADDITIONAL REQUIREMENTS FOR IEC 60044-5
IEC 61869-1
CAPACITIVE VOLTAGE
GENERAL
TRANSFORMERS
REQUIREMENTS
IEC 61869-6 IEC 61869-7 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS IEC 61869-8 SPECIFIC REQUIREMENTS FOR IEC 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
IEC 61869-9 DIGITAL INTERFACE FOR
INSTRUMENT TRANSFORMERS
IEC 61869-10 ADDITIONAL REQUIREMENTS FOR
LOW-POWER PASSIVE CURRENT
TRANSFORMERS
IEC 61869-11 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
LOW-POWER PASSIVE VOLTAGE
TRANSFORMERS
IEC 61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC
INSTRUMENT TRANSFORMER OR
COMBINED LOW-POWER PASSIVE
INSTRUMENT TRANSFORMERS
IEC 61869-13 STAND-ALONE MERGING UNIT
IEC 61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
IEC 61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 7 –

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

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

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

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

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

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

colour printer.
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SIST EN IEC 61869-10:2018
– 8 – IEC 61869-10:2017 © IEC 2017
INTRODUCTION

Low-power passive current transformers (LPCT) are based on passive technologies without

any active electronic components. They can have an output signal proportional to the primary

current, for example iron core coils with integrated shunt as a current to voltage converter

(primary converter) or they can have an output signal proportional to the derivative of the

primary current, for example air-core coils (Rogowski coils). This part of IEC 61869 does not

cover the air-core coils with active integrator.

According to a general block diagram given in Figure 601 of IEC 61869-6:2016, the low-power

passive current transformers do not use an active primary converter (i.e. without any active

electronic component); therefore, there is no need for primary power supply. Additionally,

neither the secondary converter nor the secondary power supply is used.
The general block diagram of a low-power passive current transformer is given in
Figure 1001.

The applied technology decides which part is necessary for the realization of a low-power

passive current transformer, i.e. it is not absolutely necessary that the transmitting cable or

primary converter described in Figure 1001 be included in the low-power passive current

transformer. The derivative LPCT solution considers only the air-core coil as the primary

sensor and the transmission cable as the transmitting system. In this technology, the primary

converter is not considered. In case of a proportional LPCT solution, the ferromagnetic-core

coil is considered as the primary sensor, a burden resistance connected directly to the coil

outputs works as a primary converter and the transmission cable is a transmitting system.

P1 S1
Primary
Passive Transmitting
current sensor
primary converter cable
P2 S2
IEC
Figure 1001 – General block diagram of a single-phase low-power
passive current transformer
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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 9 –
INSTRUMENT TRANSFORMERS –
Part 10: Additional requirements
for low-power passive current transformers
1 Scope

This part of IEC 61869 is a product standard and covers only additional requirements for low-

power passive current transformers. The product standard for low-power passive current

transformers comprises IEC 61869-1, together with IEC 61869-6 and this document with

specific requirements.

This document is applicable to newly manufactured low-power passive current transformers

with analogue output for use with electrical measuring instruments or electrical protective

devices having a rated frequency from 15 Hz to 100 Hz.

This document covers low-power passive current transformers used for measurement or

protection and multi-purpose low-power passive current transformers used for both

measurement and protection.

Subclause 5.6.1001 covers the accuracy requirements that are necessary for low-power

passive current transformers for use with electrical measuring instruments.

Subclause 5.6.1002 covers the accuracy requirements that are necessary for low-power

passive current transformers for use with electrical protective relays, and particularly for forms

of protection in which the prime requirement is to maintain the accuracy up to several times

the rated current. If required, the transient accuracy of low-power passive current

transformers during fault is also given in 5.6.1002.

Low-power passive current transformers have analogue voltage output only (for digital output

or for technology using any kind of active electronic components refer to IEC 61869-8 ). Such

low-power passive current transformers can include the secondary signal cable (transmitting

cable). The principle of operation of derivative low-power passive current transformers using

air-core coils (Rogowski coils) is given in Annex 10B and the principle of operation of

proportional low-power passive current transformers using iron-core coils with integrated

shunt is given in Annex 10C.
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 60059, IEC standard current ratings
IEC 61869-6:2016, Instrument transformers – Part 6: Additional general requ
...

SLOVENSKI STANDARD
SIST EN IEC 61869-10:2018
01-maj-2018
0HULOQLWUDQVIRUPDWRUMLGHO'RGDWQH]DKWHYH]DSDVLYQHWRNRYQH
WUDQVIRUPDWRUMHPDMKQHPRþL ,(&

Instrument transformers - Part 10: Additional requirements for low-power passive current

transformers (IEC 61869-10:2017)
Ta slovenski standard je istoveten z: EN IEC 61869-10:2018
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
SIST EN IEC 61869-10:2018 en

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

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SIST EN IEC 61869-10:2018
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SIST EN IEC 61869-10:2018
EUROPEAN STANDARD EN IEC 61869-10
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 17.220.20
English Version
Instrument transformers - Part 10: Additional requirements for
low-power passive current transformers
(IEC 61869-10:2017)

Transformateurs de mesure - Partie 10: Exigences Messwandler - Teil 10: Zusätzliche Anforderungen für

supplémentaires concernant les transformateurs de courant Kleinsignal-Stromwandler

passifs de faible puissance (IEC 61869-10:2017)
(IEC 61869-10:2017)

This European Standard was approved by CENELEC on 2018-01-17. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 61869-10:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 61869-10:2018
EN IEC 61869-10:2018 (E)
European foreword

The text of document 38/550/FDIS, future edition 1 of IEC 61869-10, prepared by IEC/TC 38

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

CENELEC as EN IEC 61869-10:2018.
The following dates are fixed:
(dop) 2018-10-17
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2021-01-17
standards conflicting with the
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 61869-10:2017 was approved by CENELEC as a European

Standard without any modification.
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SIST EN IEC 61869-10:2018
EN IEC 61869-10:2018 (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.
Publication Year Title EN/HD Year
IEC 60059 - IEC standard current ratings EN 60059 -
IEC 61869-6 2016 Instruments transformers -- Part 6: EN 61869-6 2016
Additional general requirements for Low
Power Instrument Transformers
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SIST EN IEC 61869-10:2018
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SIST EN IEC 61869-10:2018
IEC 61869-10
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 10: Additional requirements for low-power passive current transformers
Transformateurs de mesure –
Partie 10: Exigences supplémentaires concernant les transformateurs de
courant passifs de faible puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-5129-4

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 61869-10:2018
– 2 – IEC 61869-10:2017 © IEC 2017
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 8

1 Scope .............................................................................................................................. 9

2 Normative references ...................................................................................................... 9

3 Terms and definitions .................................................................................................... 10

3.1 General definitions ................................................................................................ 10

3.4 Definitions related to accuracy .............................................................................. 10

3.7 Index of abbreviations ........................................................................................... 13

5 Ratings .......................................................................................................................... 13

5.3 Rated insulation levels and voltages ..................................................................... 13

5.5 Rated output ......................................................................................................... 14

5.6 Rated accuracy class ............................................................................................ 14

5.1001 Standard values for rated primary current (I )...................................................... 16

5.1002 standard values for rated extended primary current factor (K ) .......................... 16

pcr

5.1003 Standard value of rated continuous thermal current (I ) ..................................... 16

cth

5.1004 Standard values of rated secondary voltage (U ) ................................................. 17

5.1005 Short-time current ratings ..................................................................................... 17

5.1006 Rated phase offset (φ ) ....................................................................................... 17

6 Design and construction ................................................................................................ 17

6.11 Electromagnetic compatibility (EMC) ..................................................................... 17

6.13 Markings ............................................................................................................... 17

6.601 Requirements for optical transmitting system and optical output link ..................... 19

6.602 Requirements for electrical transmitting system and electrical wires for

output link ............................................................................................................. 19

6.603 Signal-to-noise ratio .............................................................................................. 19

6.604 Failure detection and maintenance announcement ................................................ 19

6.605 Operability ............................................................................................................ 19

6.606 Reliability and dependability ................................................................................. 19

6.607 Vibrations ............................................................................................................. 20

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

7.1 General ................................................................................................................. 20

7.2 Type tests ............................................................................................................. 21

7.4 Special tests ......................................................................................................... 25

601 Information to be given with enquiries, tenders and orders ............................................ 25

601.1 Designation ........................................................................................................... 25

601.2 Dependability ........................................................................................................ 26

Annex 10A (informative) Designation of accuracy class when using the corrected

transformation ratio and ratio correction factor ...................................................................... 27

10A.1 General ................................................................................................................. 27

10A.2 Designation of accuracy class based on rated transformation ratio ....................... 28

10A.3 Designation of accuracy class based on individual ratio correction factor .............. 28

10A.4 Example of application .......................................................................................... 28

Annex 10B (informative) Principle of operation of Rogowski coils ......................................... 32

10B.1 General ................................................................................................................. 32

10B.2 Principle of operation ............................................................................................ 32

10B.3 Designs ................................................................................................................ 33

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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 3 –

10B.4 Accuracy ............................................................................................................... 33

10B.5 Frequency dependence and response ................................................................... 35

Annex 10C (informative) Principle of operation of low-power iron core current

transformers (proportional LPCT) .......................................................................................... 37

10C.1 General ................................................................................................................. 37

10C.2 Principle ............................................................................................................... 37

10C.3 Accuracy ............................................................................................................... 38

Annex 10D (normative) Test for accuracy with respect to the positioning of the primary

conductor .............................................................................................................................. 39

10D.1 General ................................................................................................................. 39

10D.2 Designation of accuracy class extension ............................................................... 39

10D.3 Test procedure ...................................................................................................... 40

Bibliography .......................................................................................................................... 42

Figure 1001 – General block diagram of a single-phase low-power passive current

transformer ............................................................................................................................. 8

Figure 1002 – Marking of terminals ....................................................................................... 18

Figure 1003 – Test set up for impact of magnetic field from other phases ............................. 24

Figure 10A.1 – Accuracy class designation improved based on individual ratio

correction factor CF ............................................................................................................. 28

Figure 10A.2 – Accuracy test of passive LPCT ...................................................................... 29

Figure 10A.3 – Accuracy class of 1 % designated based on rated transformation ratio .......... 30

Figure 10A.4 – Accuracy class of 0,1 % designated based on using the ratio correction

factor and corrected transformation ratio ............................................................................... 31

Figure 10B.1 – Rogowski coil Equivalent Circuits .................................................................. 35

Figure 10B.2 – Integrated and non-integrated Rogowski coil output signals .......................... 35

Figure 10B.3 – Rogowski coil frequency dependence test ..................................................... 36

Figure 10C.1 – Principle of iron core current transformer ...................................................... 37

Figure 10C.2 – Equivalent circuit of the iron core current transformer with voltage

output ................................................................................................................................... 38

Figure 10D.1 – Definition of the angle between the primary conductor and the LPCT ............ 39

d = d ......................................................................................................................... 40

min max

Figure 10D.2 – Illustration of the primary conductor position according to the position

factor .................................................................................................................................... 40

Figure 10D.3 – Accuracy measurement test set up ............................................................... 41

Table 1001 – Limits of ratio error and phase error for measuring passive LPCT ................... 15

Table 1002 – Limits of errors ................................................................................................ 16

Table 1003 – Pin assignment for RJ45 connectors used in passive LPCT ............................. 19

Table 10 – List of tests.......................................................................................................... 20

Table 1004 – Designation of a passive LPCT ........................................................................ 26

Table 10A.1 – Ratio, ratio error based on mean value, and corresponding primary

current .................................................................................................................................. 29

Table 10A.2 – Measured ratio error, correction factor and ratio error based on ratio

correction factor for five passive LPCT ................................................................................. 30

Table 10D.1 – Limits for the position of the primary conductor with respect to the

passive LPCT ....................................................................................................................... 39

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SIST EN IEC 61869-10:2018
– 4 – IEC 61869-10:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 10: Additional requirements
for low-power passive current transformers
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 61869-10 has been prepared IEC technical committee 38:

Instrument transformers.

This first edition of IEC 61869-10, together with IEC 61869-1, IEC 61869-6, IEC 61869-8 and

IEC 61869-9, cancels and replaces the first edition of IEC 60044-8, published in 2002 . This

edition constitutes a technical revision.

The technical changes concern IEC TC 38's decision to restructure the whole set of stand-

alone standards in the IEC 60044 series and transform it into a new set of standards

composed of general requirements documents and specific requirements documents.
_____________

IEC 60044-8 will eventually be replaced by the IEC 61869 series, but until all the relevant parts of the

IEC 61869 series will be published, this standard is still in force.
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SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
FDIS Report on voting
38/550/FDIS 38/551/RVD

Full information on the voting for the approval of this part of IEC 61869 can be found in the

report on voting indicated in the above table.

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

This standard is Part 10 of IEC 61869, published under the general title Instrument

transformers.

This Part 10 is to be read in conjunction with, and is based on, 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 of

these documents.
This Part 10 follows the structure of IEC 61869-1:2007 and IEC 61869-6:2016 and
supplements or modifies the corresponding clauses.

When a particular subclause of Part 1or part 6 is not mentioned in this Part 10, that subclause

applies. When this part of IEC 61869 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 note, the following numbering

system is used:

– clauses, subclauses, tables, figures and notes that are numbered starting from 1001 are

additional to those in Part 1 and Part 6;
– additional annexes are lettered 10A, 10B, 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 on the IEC

website.
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SIST EN IEC 61869-10:2018
– 6 – IEC 61869-10:2017 © IEC 2017
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
IEC 61869-2 ADDITIONAL REQUIREMENTS FOR IEC 60044-1
CURRENT TRANSFORMERS
IEC 60044-6
IEC 61869-3 ADDITIONAL REQUIREMENTS FOR IEC 60044-2
INDUCTIVE VOLTAGE
TRANSFORMERS
IEC 61869-4 ADDITIONAL REQUIREMENTS FOR IEC 60044-3
COMBINED TRANSFORMERS
IEC 61869-5 ADDITIONAL REQUIREMENTS FOR IEC 60044-5
IEC 61869-1
CAPACITIVE VOLTAGE
GENERAL
TRANSFORMERS
REQUIREMENTS
IEC 61869-6 IEC 61869-7 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
ELECTRONIC VOLTAGE
ADDITIONAL
TRANSFORMERS
GENERAL
REQUIREMENTS IEC 61869-8 SPECIFIC REQUIREMENTS FOR IEC 60044-8
FOR LOW-POWER
ELECTRONIC CURRENT
INSTRUMENT
TRANSFORMERS
TRANSFORMERS
IEC 61869-9 DIGITAL INTERFACE FOR
INSTRUMENT TRANSFORMERS
IEC 61869-10 ADDITIONAL REQUIREMENTS FOR
LOW-POWER PASSIVE CURRENT
TRANSFORMERS
IEC 61869-11 ADDITIONAL REQUIREMENTS FOR IEC 60044-7
LOW-POWER PASSIVE VOLTAGE
TRANSFORMERS
IEC 61869-12 ADDITIONAL REQUIREMENTS FOR
COMBINED ELECTRONIC
INSTRUMENT TRANSFORMER OR
COMBINED LOW-POWER PASSIVE
INSTRUMENT TRANSFORMERS
IEC 61869-13 STAND-ALONE MERGING UNIT
IEC 61869-14 ADDITIONAL REQUIREMENTS FOR
CURRENT TRANSFORMERS FOR DC
APPLICATIONS
IEC 61869-15 ADDITIONAL REQUIREMENTS FOR
VOLTAGE TRANSFORMERS FOR DC
APPLICATIONS
---------------------- Page: 12 ----------------------
SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 7 –

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

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

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

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

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

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

colour printer.
---------------------- Page: 13 ----------------------
SIST EN IEC 61869-10:2018
– 8 – IEC 61869-10:2017 © IEC 2017
INTRODUCTION

Low-power passive current transformers (LPCT) are based on passive technologies without

any active electronic components. They can have an output signal proportional to the primary

current, for example iron core coils with integrated shunt as a current to voltage converter

(primary converter) or they can have an output signal proportional to the derivative of the

primary current, for example air-core coils (Rogowski coils). This part of IEC 61869 does not

cover the air-core coils with active integrator.

According to a general block diagram given in Figure 601 of IEC 61869-6:2016, the low-power

passive current transformers do not use an active primary converter (i.e. without any active

electronic component); therefore, there is no need for primary power supply. Additionally,

neither the secondary converter nor the secondary power supply is used.
The general block diagram of a low-power passive current transformer is given in
Figure 1001.

The applied technology decides which part is necessary for the realization of a low-power

passive current transformer, i.e. it is not absolutely necessary that the transmitting cable or

primary converter described in Figure 1001 be included in the low-power passive current

transformer. The derivative LPCT solution considers only the air-core coil as the primary

sensor and the transmission cable as the transmitting system. In this technology, the primary

converter is not considered. In case of a proportional LPCT solution, the ferromagnetic-core

coil is considered as the primary sensor, a burden resistance connected directly to the coil

outputs works as a primary converter and the transmission cable is a transmitting system.

P1 S1
Primary
Passive Transmitting
current sensor
primary converter cable
P2 S2
IEC
Figure 1001 – General block diagram of a single-phase low-power
passive current transformer
---------------------- Page: 14 ----------------------
SIST EN IEC 61869-10:2018
IEC 61869-10:2017 © IEC 2017 – 9 –
INSTRUMENT TRANSFORMERS –
Part 10: Additional requirements
for low-power passive current transformers
1 Scope

This part of IEC 61869 is a product standard and covers only additional requirements for low-

power passive current transformers. The product standard for low-power passive current

transformers comprises IEC 61869-1, together with IEC 61869-6 and this document with

specific requirements.

This document is applicable to newly manufactured low-power passive current transformers

with analogue output for use with electrical measuring instruments or electrical protective

devices having a rated frequency from 15 Hz to 100 Hz.

This document covers low-power passive current transformers used for measurement or

protection and multi-purpose low-power passive current transformers used for both

measurement and protection.

Subclause 5.6.1001 covers the accuracy requirements that are necessary for low-power

passive current transformers for use with electrical measuring instruments.

Subclause 5.6.1002 covers the accuracy requirements that are necessary for low-power

passive current transformers for use with electrical protective relays, and particularly for forms

of protection in which the prime requirement is to maintain the accuracy up to several times

the rated current. If required, the transient accuracy of low-power passive current

transformers during fault is also given in 5.6.1002.

Low-power passive current transformers have analogue voltage output only (for digital output

or for technology using any kind of active electronic components refer to IEC 61869-8 ). Such

low-power passive current transformers can include the secondary signal cable (transmitting

cable). The principle of operation of derivative low-power passive current transformers using

air-core coils (Rogowski coils) is given in Annex 10B and the principle of operation of

proportional low-power passive current transformers using iron-core coils with integrated

shunt is given in Annex 10C.
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 60059, IEC standard current ratings
IEC 61869-6:2016, Instrument transformers – Part 6: Ad
...

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