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

Messwandler - Teil 6: Zusätzliche allgemeine Anforderungen für Kleinsignal-Messwandler

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

Instrumentni transformatorji - 6. del: Dodatne splošne zahteve za instrumentne transformatorje majhnih moči (IEC 61869-6:2016)

Ta del standarda IEC 61869 je standard za skupino proizvodov in zajema samo dodatne splošne zahteve za merilne transformatorje majhnih moči (LPIT) za uporabo z izmeničnim tokom z nazivnimi frekvencami 15–100 Hz, ki zajemajo MV, HV in EHV, ali za uporabo z
enosmernim tokom. Ta standard za proizvode temelji na ustreznem standardu za posamezen proizvod ter na standardu IEC 61869-1:2007.
Ta del standarda IEC 61869 ne obravnava specifikacij za digitalno obliko zapisa merilnih transformatorjev.
Ta del standarda IEC 61869 določa napake v primeru analognega ali digitalnega zapisa. Druge lastnosti digitalnega vmesnika za merilne transformatorje so standardizirane v standardu IEC 61869-9 kot uporaba skupine standardov IEC 61850, ki podrobno opisujejo večplastno komunikacijsko arhitekturo podpostaj.
Ta del standarda IEC 61869 obravnava dodatne zahteve glede pasovne širine. Zahteve glede natančnosti pri harmonskih nihanjih in zahteve za filtre za odpravljanje potujevanja frekvenc so podane v normativnem dodatku 6A.4.
Splošni blokovni diagram enofaznih merilnih transformatorjev majhnih moči je podan na sliki 601.
Glede na tehnologijo ni povsem nujno, da so vsi deli, opisani na sliki 601, vključeni v merilnem transformatorju.
Tako so na primer pri pasivnih transformatorjih majhnih moči (transformatorji brez aktivnih elektronskih komponent) bloki sestavljeni samo iz pasivnih komponent brez napajanja.

General Information

Status
Published
Publication Date
22-Dec-2016
Drafting Committee
Current Stage
6060 - Document made available
Due Date
23-Dec-2016
Completion Date
23-Dec-2016

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SLOVENSKI STANDARD
SIST EN 61869-6:2017
01-februar-2017
Nadomešča:
SIST EN 60044-7:2000
SIST EN 60044-8:2003
Instrumentni transformatorji - 6. del: Dodatne splošne zahteve za instrumentne
transformatorje majhnih moči (IEC 61869-6:2016)
Instruments transformers - Part 6: Additional general requirements for Low Power
Instrument Transformers (IEC 61869-6:2016)
Ta slovenski standard je istoveten z: EN 61869-6:2016
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN 61869-6:2017 en

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

---------------------- Page: 1 ----------------------
SIST EN 61869-6:2017
---------------------- Page: 2 ----------------------
SIST EN 61869-6:2017
EUROPEAN STANDARD EN 61869-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 17.220.20 Supersedes EN 60044-7:2000 (partially),
EN 60044-8:2002 (partially)
English Version
Instrument transformers - Part 6: Additional general
requirements for low-power instrument transformers
(IEC 61869-6:2016)

Transformateurs de mesure - Partie 6: Exigences générales Messwandler - Teil 6: Zusätzliche allgemeine

supplémentaires concernant les transformateurs de mesure Anforderungen für Kleinsignal-Messwandler

de faible puissance (IEC 61869-6:2016)
(IEC 61869-6:2016)

This European Standard was approved by CENELEC on 2016-06-01. 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, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61869-6:2016 E
---------------------- Page: 3 ----------------------
SIST EN 61869-6:2017
EN 61869-6:2016
European foreword

The text of document 38/501/FDIS, future edition 1 of IEC 61869-6, prepared by IEC/TC 38

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

CENELEC as EN 61869-6:2016.
The following dates are fixed:
(dop) 2017-06-23
• 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) 2019-12-23
standards conflicting with the
document have to be withdrawn

This document is to be read jointly with, and is based on, EN 61869-1:2009, General requirements,

However, the reader is encouraged to use the most recent edition of that document.

This document follows the structure of EN 61869 series and supplements or modifies the

corresponding clauses in EN 61869-1 Standard.

When a particular clause/subclause of Part 1, is not mentioned in this Part 6, that clause/subclause

applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”,

the relevant text in Part 1 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 601 are additional to

those in Part 1;
– additional annexes are lettered 6A, 6B, etc.

This document, jointly with EN 61869-1:2009, supersedes EN 60044-7:2000 (partially) and

EN 60044-8:2002 (partially).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 61869-6:2016 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60044-7:1999 NOTE Harmonized as EN 60044-7:2000 (not modified).
IEC 60044-8:2002 NOTE Harmonized as EN 60044-8:2002 (not modified)
IEC 61508-1 NOTE Harmonized as EN 61508-1.
IEC 61508-3 NOTE Harmonized as EN 61508-3.
IEC 61850 Series NOTE Harmonized as EN 61850 Series.
IEC 61869 Series NOTE Harmonized as EN 61869 Series.
IEC 61869-5 NOTE Harmonized as EN 61869-5.
IEC 61869-9 NOTE Harmonized as EN 61869-9.
IEC 61869-10 NOTE Harmonized as EN 61869-10.
IEC 61869-11 NOTE Harmonized as EN 61869-11.
---------------------- Page: 4 ----------------------
SIST EN 61869-6:2017
EN 61869-6:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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
Annex ZA of EN 61869:2009 is applicable with the following additions:
Publication Year Title EN/HD Year
- - Voltage characteristics of electricity EN 50160 2010
supplied by public electricity networks
IEC 60068-2-6 2007 Environmental testing - EN 60068-2-6 2008
Part 2-6: Tests - Test Fc: Vibration
(sinusoidal)
IEC 60255-27 2013 Measuring relays and protection equipment EN 60255-27 2014
- Part 27: Product safety requirements
IEC 60603-7-1 2011 Connectors for electronic equipment - EN 60603-7-1 2011
Part 7-1: Detail specification for 8-way,
shielded, free and fixed connectors
IEC 60794-2 2002 Optical fibre cables - EN 60794-2 2003
Part 2: Indoor cables - Sectional
specification
IEC 60794-3 2014 Optical fibre cables - EN 60794-3 2015
Part 3: Outdoor cables - Sectional
specification
IEC 60812 2006 Analysis techniques for system reliability - EN 60812 2006
Procedure for failure mode and effects
analysis (FMEA)
1) 2)
IEC 61000-4-1 2006 Electromagnetic compatibility (EMC) - EN 61000-4-1 2007
Part 4-1: Testing and measurement
techniques - Overview of IEC 61000-4
series
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
+A1 2007 +A1 2008
+A2 2010 +A2 2010
Superseded by IEC/TR 61000-4-1:2016.
Withdrawn publication.
---------------------- Page: 5 ----------------------
SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - EN 61000-4-4 2012
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - EN 61000-4-5 2014
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - EN 61000-4-6 2014
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-7 2002 Electromagnetic compatibility (EMC) - EN 61000-4-7 2002
Part 4-7: Testing and measurement
techniques - General guide on harmonics
and interharmonics measurements and
instrumentation, for power supply systems
and equipment connected thereto
+A1 2008 +A1 2009
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - EN 61000-4-8 2010
Part 4-8: Testing and measurement
techniques - Power frequency magnetic
field immunity test
IEC 61000-4-9 1993 Electromagnetic compatibility (EMC) - EN 61000-4-9 1993
Part 4-9: Testing and measurement
techniques - Pulse magnetic field immunity
test
+A1 2000 +A1 2001
IEC 61000-4-10 1993 Electromagnetic compatibility (EMC) - EN 61000-4-10 1993
Part 4-10: Testing and measurement
techniques - Damped oscillatory magnetic
field immunity test
+A1 2000 +A1 2001
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) - EN 61000-4-13 2002
Part 4-13: Testing and measurement
techniques - Harmonics and
interharmonics including mains signaling at
a.c. power port, low frequency immunity
tests
+A1 2009 +A1 2009
Superseded by EN 61000-4-9:2016 (IEC 61000-4-9:2016): DOW = 2019-08-17.
Superseded by IEC 61000-4-10:2016.
---------------------- Page: 6 ----------------------
SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
IEC 61000-4-16 1998 Electromagnetic compatibility (EMC) - EN 61000-4-16 1998
Part 4-16: Testing and measurement
techniques - Test for immunity to
conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
+A1 2001 +A1 2004
+A2 2009 +A2 2011
IEC 61000-4-18 2006 Electromagnetic compatibility (EMC) - EN 61000-4-18 2007
Part 4-18: Testing and measurement + corr. September 2007
techniques - Damped oscillatory wave
immunity test
+A1 2010 +A1 2010
IEC 61000-4-29 2000 Electromagnetic compatibility (EMC) - EN 61000-4-29 2000
Part 4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61025 2006 Fault Tree Analysis (FTA) EN 61025 2007
IEC 61076-2-101 2012 Connectors for electronic equipment - EN 61076-2-101 2012
Product requirements -
Part 2-101: Circular connectors - Detail
specification for M12 connectors with
screw-locking
IEC/TS 61850-2 2003 Communication networks and systems in - -
substations -
Part 2: Glossary
IEC 61850-7-4 2010 Communication networks and systems for EN 61850-7-4 2010
power utility automation -
Part 7-4: Basic communication structure -
Compatible logical node classes and data
object classes
IEC 61869-1 (mod) 2007 Instrument transformers - EN 61869-1 2009
Part 1: General requirements
IEC 61869-2 2012 Instrument transformers - EN 61869-2 2012
Part 2: Additional requirements for current
transformers
IEC 61869-3 2011 Instrument transformers - EN 61869-3 2011
Part 3: Additional requirements for
inductive voltage transformers
IEC/TR 61869-103 2012 Instrument transformers - The use of - -
instrument transformers for power quality
measurement
IEC 62271-100 2008 High-voltage switchgear and controlgear - EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
+A1 2012 +A1 2012
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
Superseded by EN 61000-4-16:2016 (IEC 61000-4-16:2015): DOW = 2019-01-13.
---------------------- Page: 7 ----------------------
SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
ISO/IEC/IEEE 2010 Information technology - Smart transducer - -
21451-4 interface for sensors and actuators -
Part 4: Mixed-mode communication
protocols and Transducer Electronic Data
Sheet (TEDS) formats
---------------------- Page: 8 ----------------------
SIST EN 61869-6:2017
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

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

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 9 ----------------------
SIST EN 61869-6:2017
– 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

5.4 Rated frequency .................................................................................................. 29

5.5 Rated output ....................................................................................................... 29

5.5.601 Rated burden (R ) ...................................................................................... 29

5.5.602 Standard values for the rated delay time (t ) ............................................... 29

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

---------------------- Page: 10 ----------------------
SIST EN 61869-6:2017
IEC 61869-6:2016  IEC 2016 – 3 –

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

---------------------- Page: 11 ----------------------
SIST EN 61869-6:2017
– 4 – IEC 61869-6:2016  IEC 2016

6C.2 General ............................................................................................................... 65

6C.2.1 Defining primary and secondary voltages ...................................................... 65

6C.2.2 Normal service conditions of the network ...................................................... 65

6C.2.3 Abnormal service conditions of the network .................................................. 66

6C.2.4 Rated secondary voltages ............................................................................ 66

6C.2.5 Steady-state conditions ................................................................................ 66

6C.3 Transient conditions ............................................................................................ 66

6C.3.1 Theoretical considerations ........................................................................... 66

6C.3.2 Definition of transient error ........................................................................... 73

6C.3.3 Test of transient performance ....................................................................... 73

Annex 6D (informative) Test circuits ................................................................................... 78

6D.1 Test circuits for accuracy measurements in steady state for low-power

current transformers ............................................................................................ 78

6D.2 Test circuits for accuracy measurements in steady state for low-power

voltage transformers ........................................................................................... 81

Annex 6E (informative) Graph explaining the accuracy requirements for multi-purpose

low-power current transformer ............................................................................................. 84

Bibliography ....................................................................................................................... 85

Figure 601 – General block diagram of a single-phase LPIT................................................. 10

Figure 602 – Primary time constant T ................................................................................ 19

Figure 603 – Duty cycles, single energization ...................................................................... 20

Figure 604 – Duty cycles, double energization ..................................................................... 21

Figure 605 – Examples of subassembly subjected to EMC tests – Usual structure used

in HV AIS applications ........................................................................................................ 38

Figure 606 – Examples of subassembly subjected to EMC tests – Usual structure used

in MV applications .............................................................................................................. 39

Figure 607 – Examples of subassembly subjected to EMC tests – Usual structure used

in HV GIS applications ........................................................................................................ 39

Figure 608 – Temperature cycle accuracy test ..................................................................... 42

Figure 6A.1 – Digital data acquisition system example ......................................................... 48

Figure 6A.2 – Frequency response mask for metering accuracy class 1 (f = 60 Hz, f =

r s

4 800 Hz) ........................................................................................................................... 49

Figure 6B.1 – Illustration of a fault in a power system .......................................................... 56

Figure 6B.2 – Short-circuit current a.c. and d.c. components ............................................... 56

Figure 6B.3 – Symmetric fault current ................................................................................. 57

Figure 6B.4 – Asymmetric fault current ................................................................................ 57

Figure 6B.5 – Equivalent electrical circuit of a conventional CT ............................................ 58

Figure 6B.6 – Flux-current characteristic for a conventional CT without remanence

representation .................................................................................................................... 59

Figure 6B.7 – Representation of hysteresis and remanent flux for a conventional CT ........... 60

Figure 6B.8 – Comparison of flux-current characteristics for gapped and gapless CTs ......... 62

Figure 6B.9 – Secondary current distorted due to the CT saturation ..................................... 63

Figure 6B.10 – AC component for non-saturated and saturated CT ...................................... 63

Figure 6C.1 – Schematic diagram explaining the trapped charge phenomena ....................... 69

Figure 6C.2 – Voltages during trapped charges phenomena ................................................ 70

Figure 6C.3 – Modelization example of a simplified low-power voltage transformer ............... 72

---------------------- Page: 12 ----------------------
SIST EN 61869-6:2017
IEC 61869-6:2016  IEC 2016 – 5 –
Figure 6C.4 – Testing arrangement for short time constant .
...

SLOVENSKI STANDARD
SIST EN 61869-6:2017
01-februar-2017
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SIST EN 60044-8:2003
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Instruments transformers - Part 6: Additional general requirements for Low Power
Instrument Transformers (IEC 61869-6:2016)
Ta slovenski standard je istoveten z: EN 61869-6:2016
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
SIST EN 61869-6:2017 en

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

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SIST EN 61869-6:2017
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SIST EN 61869-6:2017
EUROPEAN STANDARD EN 61869-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2016
ICS 17.220.20 Supersedes EN 60044-7:2000 (partially),
EN 60044-8:2002 (partially)
English Version
Instrument transformers - Part 6: Additional general
requirements for low-power instrument transformers
(IEC 61869-6:2016)

Transformateurs de mesure - Partie 6: Exigences générales Messwandler - Teil 6: Zusätzliche allgemeine

supplémentaires concernant les transformateurs de mesure Anforderungen für Kleinsignal-Messwandler

de faible puissance (IEC 61869-6:2016)
(IEC 61869-6:2016)

This European Standard was approved by CENELEC on 2016-06-01. 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, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 61869-6:2016 E
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SIST EN 61869-6:2017
EN 61869-6:2016
European foreword

The text of document 38/501/FDIS, future edition 1 of IEC 61869-6, prepared by IEC/TC 38

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

CENELEC as EN 61869-6:2016.
The following dates are fixed:
(dop) 2017-06-23
• 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) 2019-12-23
standards conflicting with the
document have to be withdrawn

This document is to be read jointly with, and is based on, EN 61869-1:2009, General requirements,

However, the reader is encouraged to use the most recent edition of that document.

This document follows the structure of EN 61869 series and supplements or modifies the

corresponding clauses in EN 61869-1 Standard.

When a particular clause/subclause of Part 1, is not mentioned in this Part 6, that clause/subclause

applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”,

the relevant text in Part 1 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 601 are additional to

those in Part 1;
– additional annexes are lettered 6A, 6B, etc.

This document, jointly with EN 61869-1:2009, supersedes EN 60044-7:2000 (partially) and

EN 60044-8:2002 (partially).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 61869-6:2016 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60044-7:1999 NOTE Harmonized as EN 60044-7:2000 (not modified).
IEC 60044-8:2002 NOTE Harmonized as EN 60044-8:2002 (not modified)
IEC 61508-1 NOTE Harmonized as EN 61508-1.
IEC 61508-3 NOTE Harmonized as EN 61508-3.
IEC 61850 Series NOTE Harmonized as EN 61850 Series.
IEC 61869 Series NOTE Harmonized as EN 61869 Series.
IEC 61869-5 NOTE Harmonized as EN 61869-5.
IEC 61869-9 NOTE Harmonized as EN 61869-9.
IEC 61869-10 NOTE Harmonized as EN 61869-10.
IEC 61869-11 NOTE Harmonized as EN 61869-11.
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SIST EN 61869-6:2017
EN 61869-6:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

NOTE 1 When 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
Annex ZA of EN 61869:2009 is applicable with the following additions:
Publication Year Title EN/HD Year
- - Voltage characteristics of electricity EN 50160 2010
supplied by public electricity networks
IEC 60068-2-6 2007 Environmental testing - EN 60068-2-6 2008
Part 2-6: Tests - Test Fc: Vibration
(sinusoidal)
IEC 60255-27 2013 Measuring relays and protection equipment EN 60255-27 2014
- Part 27: Product safety requirements
IEC 60603-7-1 2011 Connectors for electronic equipment - EN 60603-7-1 2011
Part 7-1: Detail specification for 8-way,
shielded, free and fixed connectors
IEC 60794-2 2002 Optical fibre cables - EN 60794-2 2003
Part 2: Indoor cables - Sectional
specification
IEC 60794-3 2014 Optical fibre cables - EN 60794-3 2015
Part 3: Outdoor cables - Sectional
specification
IEC 60812 2006 Analysis techniques for system reliability - EN 60812 2006
Procedure for failure mode and effects
analysis (FMEA)
1) 2)
IEC 61000-4-1 2006 Electromagnetic compatibility (EMC) - EN 61000-4-1 2007
Part 4-1: Testing and measurement
techniques - Overview of IEC 61000-4
series
IEC 61000-4-2 2008 Electromagnetic compatibility (EMC) - EN 61000-4-2 2009
Part 4-2: Testing and measurement
techniques - Electrostatic discharge
immunity test
IEC 61000-4-3 2006 Electromagnetic compatibility (EMC) - EN 61000-4-3 2006
Part 4-3: Testing and measurement
techniques - Radiated, radio-frequency,
electromagnetic field immunity test
+A1 2007 +A1 2008
+A2 2010 +A2 2010
Superseded by IEC/TR 61000-4-1:2016.
Withdrawn publication.
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SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
IEC 61000-4-4 2012 Electromagnetic compatibility (EMC) - EN 61000-4-4 2012
Part 4-4: Testing and measurement
techniques - Electrical fast transient/burst
immunity test
IEC 61000-4-5 2014 Electromagnetic compatibility (EMC) - EN 61000-4-5 2014
Part 4-5: Testing and measurement
techniques - Surge immunity test
IEC 61000-4-6 2013 Electromagnetic compatibility (EMC) - EN 61000-4-6 2014
Part 4-6: Testing and measurement
techniques - Immunity to conducted
disturbances, induced by radio-frequency
fields
IEC 61000-4-7 2002 Electromagnetic compatibility (EMC) - EN 61000-4-7 2002
Part 4-7: Testing and measurement
techniques - General guide on harmonics
and interharmonics measurements and
instrumentation, for power supply systems
and equipment connected thereto
+A1 2008 +A1 2009
IEC 61000-4-8 2009 Electromagnetic compatibility (EMC) - EN 61000-4-8 2010
Part 4-8: Testing and measurement
techniques - Power frequency magnetic
field immunity test
IEC 61000-4-9 1993 Electromagnetic compatibility (EMC) - EN 61000-4-9 1993
Part 4-9: Testing and measurement
techniques - Pulse magnetic field immunity
test
+A1 2000 +A1 2001
IEC 61000-4-10 1993 Electromagnetic compatibility (EMC) - EN 61000-4-10 1993
Part 4-10: Testing and measurement
techniques - Damped oscillatory magnetic
field immunity test
+A1 2000 +A1 2001
IEC 61000-4-11 2004 Electromagnetic compatibility (EMC) - EN 61000-4-11 2004
Part 4-11: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations
immunity tests
IEC 61000-4-13 2002 Electromagnetic compatibility (EMC) - EN 61000-4-13 2002
Part 4-13: Testing and measurement
techniques - Harmonics and
interharmonics including mains signaling at
a.c. power port, low frequency immunity
tests
+A1 2009 +A1 2009
Superseded by EN 61000-4-9:2016 (IEC 61000-4-9:2016): DOW = 2019-08-17.
Superseded by IEC 61000-4-10:2016.
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SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
IEC 61000-4-16 1998 Electromagnetic compatibility (EMC) - EN 61000-4-16 1998
Part 4-16: Testing and measurement
techniques - Test for immunity to
conducted, common mode disturbances in
the frequency range 0 Hz to 150 kHz
+A1 2001 +A1 2004
+A2 2009 +A2 2011
IEC 61000-4-18 2006 Electromagnetic compatibility (EMC) - EN 61000-4-18 2007
Part 4-18: Testing and measurement + corr. September 2007
techniques - Damped oscillatory wave
immunity test
+A1 2010 +A1 2010
IEC 61000-4-29 2000 Electromagnetic compatibility (EMC) - EN 61000-4-29 2000
Part 4-29: Testing and measurement
techniques - Voltage dips, short
interruptions and voltage variations on d.c.
input power port immunity tests
IEC 61025 2006 Fault Tree Analysis (FTA) EN 61025 2007
IEC 61076-2-101 2012 Connectors for electronic equipment - EN 61076-2-101 2012
Product requirements -
Part 2-101: Circular connectors - Detail
specification for M12 connectors with
screw-locking
IEC/TS 61850-2 2003 Communication networks and systems in - -
substations -
Part 2: Glossary
IEC 61850-7-4 2010 Communication networks and systems for EN 61850-7-4 2010
power utility automation -
Part 7-4: Basic communication structure -
Compatible logical node classes and data
object classes
IEC 61869-1 (mod) 2007 Instrument transformers - EN 61869-1 2009
Part 1: General requirements
IEC 61869-2 2012 Instrument transformers - EN 61869-2 2012
Part 2: Additional requirements for current
transformers
IEC 61869-3 2011 Instrument transformers - EN 61869-3 2011
Part 3: Additional requirements for
inductive voltage transformers
IEC/TR 61869-103 2012 Instrument transformers - The use of - -
instrument transformers for power quality
measurement
IEC 62271-100 2008 High-voltage switchgear and controlgear - EN 62271-100 2009
Part 100: Alternating current circuit-
breakers
+A1 2012 +A1 2012
CISPR 11 (mod) 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
Superseded by EN 61000-4-16:2016 (IEC 61000-4-16:2015): DOW = 2019-01-13.
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SIST EN 61869-6:2017
EN 61869-6:2016
Publication Year Title EN/HD Year
ISO/IEC/IEEE 2010 Information technology - Smart transducer - -
21451-4 interface for sensors and actuators -
Part 4: Mixed-mode communication
protocols and Transducer Electronic Data
Sheet (TEDS) formats
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SIST EN 61869-6:2017
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

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

® Registered trademark of the International Electrotechnical Commission
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SIST EN 61869-6:2017
– 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

5.4 Rated frequency .................................................................................................. 29

5.5 Rated output ....................................................................................................... 29

5.5.601 Rated burden (R ) ...................................................................................... 29

5.5.602 Standard values for the rated delay time (t ) ............................................... 29

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

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SIST EN 61869-6:2017
IEC 61869-6:2016  IEC 2016 – 3 –

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

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SIST EN 61869-6:2017
– 4 – IEC 61869-6:2016  IEC 2016

6C.2 General ............................................................................................................... 65

6C.2.1 Defining primary and secondary voltages ...................................................... 65

6C.2.2 Normal service conditions of the network ...................................................... 65

6C.2.3 Abnormal service conditions of the network .................................................. 66

6C.2.4 Rated secondary voltages ............................................................................ 66

6C.2.5 Steady-state conditions ................................................................................ 66

6C.3 Transient conditions ............................................................................................ 66

6C.3.1 Theoretical considerations ........................................................................... 66

6C.3.2 Definition of transient error ........................................................................... 73

6C.3.3 Test of transient performance ....................................................................... 73

Annex 6D (informative) Test circuits ................................................................................... 78

6D.1 Test circuits for accuracy measurements in steady state for low-power

current transformers ............................................................................................ 78

6D.2 Test circuits for accuracy measurements in steady state for low-power

voltage transformers ........................................................................................... 81

Annex 6E (informative) Graph explaining the accuracy requirements for multi-purpose

low-power current transformer ............................................................................................. 84

Bibliography ....................................................................................................................... 85

Figure 601 – General block diagram of a single-phase LPIT................................................. 10

Figure 602 – Primary time constant T ................................................................................ 19

Figure 603 – Duty cycles, single energization ...................................................................... 20

Figure 604 – Duty cycles, double energization ..................................................................... 21

Figure 605 – Examples of subassembly subjected to EMC tests – Usual structure used

in HV AIS applications ........................................................................................................ 38

Figure 606 – Examples of subassembly subjected to EMC tests – Usual structure used

in MV applications .............................................................................................................. 39

Figure 607 – Examples of subassembly subjected to EMC tests – Usual structure used

in HV GIS applications ........................................................................................................ 39

Figure 608 – Temperature cycle accuracy test ..................................................................... 42

Figure 6A.1 – Digital data acquisition system example ......................................................... 48

Figure 6A.2 – Frequency response mask for metering accuracy class 1 (f = 60 Hz, f =

r s

4 800 Hz) ........................................................................................................................... 49

Figure 6B.1 – Illustration of a fault in a power system .......................................................... 56

Figure 6B.2 – Short-circuit current a.c. and d.c. components ............................................... 56

Figure 6B.3 – Symmetric fault current ................................................................................. 57

Figure 6B.4 – Asymmetric fault current ................................................................................ 57

Figure 6B.5 – Equivalent electrical circuit of a conventional CT ............................................ 58

Figure 6B.6 – Flux-current characteristic for a conventional CT without remanence

representation .................................................................................................................... 59

Figure 6B.7 – Representation of hysteresis and remanent flux for a conventional CT ........... 60

Figure 6B.8 – Comparison of flux-current characteristics for gapped and gapless CTs ......... 62

Figure 6B.9 – Secondary current distorted due to the CT saturation ..................................... 63

Figure 6B.10 – AC component for non-saturated and saturated CT ...................................... 63

Figure 6C.1 – Schematic diagram explaining the trapped charge phenomena ....................... 69

Figure 6C.2 – Voltages during trapped charges phenomena ................................................ 70

Figure 6C.3 – Modelization example of a simplified low-power voltage transformer ............... 72

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SIST EN 61869-6:2017
IEC 61869-6:2016  IEC 2016 – 5 –
Figure 6C.4 – Testing arrangement for short tim
...

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