IEC 61869-6:2016

Instrument transformers - Part 6: Additional general requirements for low-power instrument transformers

IEC 61869-6:2016(E) is a product family standard and covers only additional general requirements for low-power instrument transformers (LPIT) used for a.c. applications having rated frequencies from 15 Hz to 100 Hz covering MV, HV and EHV or used for d.c. applications. This product standard is based on IEC 61869-1:2007, in addition to the relevant product specific standard. This part of IEC 61869 does not cover the specification for the digital output format of instrument transformers. This part of IEC 61869 defines the errors in case of analogue or digital output. The other characteristics of the digital interface for instrument transformers are standardised in IEC 61869-9 as an application of the standards, the IEC 61850 series, which details layered substation communication architecture. This part of IEC 61869 considers additional requirements concerning bandwidth. General Requirements; however, the reader is encouraged to use its most recent edition. This first edition of IEC 61869-6 cancels and replaces the relevant parts of IEC 60044-7, published in 1999, and of IEC 60044-8, published in 2002.
This publication is to be read in conjunction with IEC 61869-1:2007

Transformateurs de mesure - Partie 6: Exigences générales supplémentaires concernant les transformateurs de mesure de faible puissance

La présente Partie de l'IEC 61869 est une norme de familles de produits et couvre uniquement les exigences générales supplémentaires concernant les transformateurs de mesure de faible puissance (LPIT) utilisés pour les applications en courant alternatif présentant des fréquences assignées comprises entre 15 Hz et 100 Hz couvrant les applications moyenne tension (MT), haute tension (HT) et très haute tension (THT) ou utilisés pour les applications en courant continu. La présente norme de produit s'appuie sur l'IEC 61869-1:2007, en plus de la norme correspondante spécifique au produit.
La présente partie de l'IEC 61869 ne couvre pas la spécification du format de sortie numérique des transformateurs de mesure.
La présente partie de l'IEC 61869 définit les erreurs pour les sorties analogiques et numériques. Les autres caractéristiques de l'interface numérique des transformateurs de mesure sont normalisées dans l'IEC 61869-9 en tant qu'application des normes de la série IEC 61850, qui décrit en détail une architecture de communication en couches applicable aux postes électriques.
La présente partie de l'IEC 61869 tient compte des exigences supplémentaires relatives à la largeur de bande.
Cette première édition de l'IEC 61869-6 annule et remplace les parties correspondantes de l'IEC 60044-7, parue en 1999, et de l'IEC 60044-8, parue en 2002.
La présente Partie 6 doit être utilisée conjointement avec l'IEC 61869-1:2007

General Information

• Status: Replaced
• Publication Date: 26-Apr-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• Technical Committee: TC 38 - Instrument Transformers
• Drafting Committee: WG 37 - TC 38/WG 37

Relations

• Replaced By: IEC 61869-1:2023 - Instrument transformers - Part 1: General requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61869-6 ®
Edition 1.0 2016-04
INTERNATIONAL
STANDARD
colour
inside
Instrument transformers –
Part 6: Additional general requirements for low-power instrument transformers

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

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Switzerland www.iec.ch
About the IEC
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International Standards for all electrical, electronic and related technologies.

About IEC publications
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IEC 61869-6 ®
Edition 1.0 2016-04
INTERNATIONAL
STANDARD
colour
inside
Instrument transformers –
Part 6: Additional general requirements for low-power instrument transformers

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20 ISBN 978-2-8322-3330-6

– 2 – IEC 61869-6:2016  IEC 2016

CONTENTS
FOREWORD. 6

1 Scope . 10

2 Normative reference . 10

3 Terms and definitions . 13

3.1 General terms and definitions . 13

3.2 Terms and definitions related to dielectric ratings and voltages . 17

3.3 Terms and definitions related to current ratings . 17

3.4 Terms and definitions related to accuracy . 21
3.5 Terms and definitions related to other ratings . 26
3.7 Index of abbreviations and symbols . 26
4 Normal and special service conditions . 28
4.2 Normal service conditions . 28
4.2.3 Vibrations or earth tremors . 28
4.2.601 Partially outdoor LPIT . 28
5 Ratings . 28
5.3 Rated insulation levels and voltages . 28
5.3.5 Insulation requirements for secondary terminals . 28
5.3.601 Rated auxiliary power supply voltage (U ) . 28
ar
5.4 Rated frequency . 29
5.5 Rated output . 29
5.5.601 Rated burden (R ) . 29
br
5.5.602 Standard values for the rated delay time (t ) . 29
dr
5.6 Rated accuracy class . 30
6 Design and construction . 30
6.7 Mechanical requirements . 30
6.11 Electromagnetic compatibility (EMC) . 30
6.11.3 Requirements for immunity . 30
6.11.4 Requirement for transmitted overvoltages . 32
6.11.601 Emission requirements . 32
6.13 Markings . 33
6.601 Requirements for optical transmitting system and optical output link . 33
6.601.1 General . 33

6.601.2 Optical connectors . 33
6.601.3 Fibre optic terminal box . 33
6.601.4 Total cable length . 33
6.602 Requirements for electrical transmitting system and electrical wires for
output link . 33
6.602.1 Connectors . 33
6.602.2 Earthing of the output cable. 34
6.603 Signal-to-noise ratio . 34
6.604 Failure detection and maintenance announcement . 35
6.605 Operability . 35
6.606 Reliability and dependability . 35
6.607 Vibrations . 35
7 Tests . 36
7.1 General . 36

7.1.2 List of tests . 36

7.2 Type tests . 37

7.2.1 General . 37

7.2.2 Temperature-rise test . 37

7.2.3 Impulse voltage withstand test on primary terminals . 37

7.2.5 Electromagnetic compatibility (EMC) tests . 37

7.2.6 Test for accuracy . 41

7.2.601 Low-voltage component voltage withstand test . 43

7.3 Routine tests . 44

7.3.1 Power-frequency voltage withstand tests on primary terminals . 44

7.3.4 Power-frequency voltage withstand tests on secondary terminals . 45
7.3.5 Test for accuracy . 45
7.3.601 Power-frequency voltage withstand test for low-voltage components . 45
7.4 Special tests . 45
7.4.601 Vibration tests . 45
601 Information to be given with enquiries, tenders and orders . 46
601.1 Designation . 46
601.2 Dependability . 46
Annex 6A (normative) LPIT frequency response and accuracy requirements for
harmonics . 47
6A.1 General . 47
6A.2 Requirements for noise and distortion . 47
6A.3 Anti-aliasing filter requirements for LPIT using digital data processing . 47
6A.4 LPIT accuracy requirements for harmonics and low frequencies . 49
6A.4.1 General . 49
6A.4.2 Measuring accuracy classes . 49
6A.4.3 Accuracy class extension for quality metering and low bandwidth d.c.
applications . 50
6A.4.4 Protective accuracy classes . 51
6A.4.5 Special high bandwidth protection accuracy class . 51
6A.4.6 Special accuracy classes for d.c. coupled low-power voltage
transformers . 52
6A.5 Tests for accuracy versus harmonics and low frequencies . 52
6A.6 Test arrangement and test circuit. 53
6A.6.1 Test for accuracy for harmonics and low frequencies . 53

6A.6.2 Type test for proper anti-aliasing . 53
Annex 6B (informative) Transient performances of low-power current transformers . 55
6B.1 General . 55
6B.2 Short-circuit currents in power systems . 55
6B.3 Conventional current transformer equivalent circuit . 58
6B.4 Types of current transformers . 60
6B.4.1 Types of conventional CTs . 60
6B.4.2 Types of low-power current transformers . 61
6B.5 Transient performance of current transformers . 62
6B.5.1 Transient performance of conventional current transformers . 62
6B.5.2 Transient performance of low-power current transformers . 63
6B.6 Summary . 64
Annex 6C (informative) Transient performances of low-power voltage transformers . 65
6C.1 Overview . 65

– 4 – IEC 61869-6:2016  IEC 2016

6C.2 General .
...

IEC 61869-6 ®
Edition 1.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 6: Additional general requirements for low-power instrument transformers

Transformateurs de mesure –
Partie 6: Exigences générales supplémentaires concernant les transformateurs
de mesure de faible puissance
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

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documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

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The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
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IEC 61869-6 ®
Edition 1.0 2016-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Instrument transformers –
Part 6: Additional general requirements for low-power instrument transformers

Transformateurs de mesure –
Partie 6: Exigences générales supplémentaires concernant les transformateurs

de mesure de faible puissance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20 ISBN 978-2-8322-4534-7

– 2 – IEC 61869-6:2016  IEC 2016
CONTENTS
FOREWORD . 6
1 Scope . 10
2 Normative reference . 10
3 Terms and definitions . 13
3.1 General terms and definitions . 13
3.2 Terms and definitions related to dielectric ratings and voltages . 17
3.3 Terms and definitions related to current ratings . 17
3.4 Terms and definitions related to accuracy . 21
3.5 Terms and definitions related to other ratings . 26
3.7 Index of abbreviations and symbols . 26
4 Normal and special service conditions . 28
4.2 Normal service conditions . 28
4.2.3 Vibrations or earth tremors . 28
4.2.601 Partially outdoor LPIT . 28
5 Ratings . 28
5.3 Rated insulation levels and voltages . 28
5.3.5 Insulation requirements for secondary terminals . 28
5.3.601 Rated auxiliary power supply voltage (U ) . 28
ar
5.4 Rated frequency . 29
5.5 Rated output . 29
5.5.601 Rated burden (R ) . 29
br
5.5.602 Standard values for the rated delay time (t ) . 29
dr
5.6 Rated accuracy class . 30
6 Design and construction . 30
6.7 Mechanical requirements . 30
6.11 Electromagnetic compatibility (EMC) . 30
6.11.3 Requirements for immunity . 30
6.11.4 Requirement for transmitted overvoltages . 32
6.11.601 Emission requirements . 32
6.13 Markings . 33
6.601 Requirements for optical transmitting system and optical output link . 33
6.601.1 General . 33
6.601.2 Optical connectors . 33
6.601.3 Fibre optic terminal box . 33
6.601.4 Total cable length . 33
6.602 Requirements for electrical transmitting system and electrical wires for
output link . 33
6.602.1 Connectors . 33
6.602.2 Earthing of the output cable . 34
6.603 Signal-to-noise ratio . 34
6.604 Failure detection and maintenance announcement . 35
6.605 Operability . 35
6.606 Reliability and dependability . 35
6.607 Vibrations . 35
7 Tests . 36
7.1 General . 36

7.1.2 List of tests . 36
7.2 Type tests . 37
7.2.1 General . 37
7.2.2 Temperature-rise test . 37
7.2.3 Impulse voltage withstand test on primary terminals . 37
7.2.5 Electromagnetic compatibility (EMC) tests . 37
7.2.6 Test for accuracy . 41
7.2.601 Low-voltage component voltage withstand test . 43
7.3 Routine tests . 44
7.3.1 Power-frequency voltage withstand tests on primary terminals . 44
7.3.4 Power-frequency voltage withstand tests on secondary terminals . 45
7.3.5 Test for accuracy . 45
7.3.601 Power-frequency voltage withstand test for low-voltage components . 45
7.4 Special tests . 45
7.4.601 Vibration tests . 45
601 Information to be given with enquiries, tenders and orders . 46
601.1 Designation. 46
601.2 Dependability . 46
Annex 6A (normative) LPIT frequency response and accuracy requirements for
harmonics . 47
6A.1 General . 47
6A.2 Requirements for noise and distortion .
...