SIST EN 61869-5:2012
Instrument transformers - Part 5: Specific requirements for capacitive voltage transformers
Instrument transformers - Part 5: Specific requirements for capacitive voltage transformers
IEC 61869-5:2011 applies to new single-phase capacitor voltage transformers connected between line and ground for system voltages Um ≥ 72,5 kV at power frequencies from 15 Hz to 100 Hz. They are intended to supply a low voltage for measurement, control and protective functions. This standard replaces IEC 60044-5 regarding capacitor voltage transformers as well as IEC-PAS 60044-5 for capacitor voltage transformers. This publication is to be read in conjunction with IEC 61869-1:2007.
Messwandler - Teil 5: Zusätzliche Anforderungen für kapazitive Spannungswandler
Transformateurs de mesure - Partie 5: Exigences additionnelles pour transformateurs capacitifs de tension
La CEI 61869-5:2011 s'applique aux transformateurs condensateurs de tension monophasés neufs connectés entre la ligne et la terre pour des tensions de réseau Um ≥ 72,5 kV aux fréquences industrielles comprises entre 15 Hz et 100 Hz. Ils sont destinés à fournir une basse tension pour les fonctions de mesure, commande et protection. La présente Norme remplace la CEI 60044-5 et la CEI-PAS 60044-5 relatives aux transformateurs condensateurs de tension. Cette publication doit être lue conjointement avec la CEI 61869-1:2007.
Instrumentni transformatorji - 5. del: Posebne zahteve za kapacitivne napetostne transformatorje
Ta del IEC 61869 velja za nove induktivne napetostne transformatorje za uporabo z električnimi merilnimi instrumenti in električnimi zaščitnimi napravami pri frekvencah od 15 Hz do 100 Hz.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2012
Instrumentni transformatorji - 5. del: Posebne zahteve za kapacitivne napetostne
transformatorje
Instrument transformers - Part 5: Specific requirements for capacitive voltage
transformers
Messwandler - Teil 5: Zusätzliche Anforderungen für kapazitive Spannungswandler
Transformateurs de mesure - Partie 5: Exigences additionnelles pour transformateurs
capacitifs de tension
Ta slovenski standard je istoveten z: EN 61869-5:2011
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 61869-5
NORME EUROPÉENNE
October 2011
EUROPÄISCHE NORM
ICS 17.220.20 Supersedes EN 60044-5:2004
English version
Instrument transformers -
Part 5: Additional requirements for capacitor voltage transformers
(IEC 61869-5:2011)
Transformateurs de mesure - Messwandler -
Partie 5: Exigences supplémentaires Teil 5: Zusätzliche Anforderungen für
concernant les transformateurs kapazitive Spannungswandler
condensateurs de tension (IEC 61869-5:2011)
(CEI 61869-5:2011)
This European Standard was approved by CENELEC on 2011-08-17. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61869-5:2011 E
Foreword
The text of document 38/411/FDIS, future edition 1 of IEC 61869-5, prepared by IEC/TC 38, "Instrument
transformers", was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
The following dates are fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-05-17
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-08-17
This European Standard supersedes EN 60044-5:2004 regarding capacitor voltage transformers.
transformers - General Requirements.
This Part 5 follows the structure of EN 61869-1 and supplements or modifies its corresponding clauses.
When a particular clause/subclause of Part 1 is not mentioned in this Part 5, that clause/subclause
applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”, the
relevant text in Part 1 shall 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 501 are additional to
those in Part 1;
– additional annexes are lettered 5A, 5B, etc.
Annex ZZ of EN 61869-1 is not applicable for this part of the series.
An overview of the planned set of standards at the date of publication of this document is given
below. The updated list of standards prepared by IEC TC38 is available at the website:
www.iec.ch.
The updated list of standards prepared by IEC TC38 and approved by CENELEC is available at
the website: www.cenelec.eu.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
- 3 - EN 61869-5:2011
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
61869-2 ADDITIONAL REQUIREMENTS FOR 60044-1
CURRENT TRANSFORMERS
61869-3 ADDITIONAL REQUIREMENTS FOR 60044-2
INDUCTIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-3
61869-4
COMBINED TRANSFORMERS
61869-1 ADDITIONAL REQUIREMENTS FOR 60044-5
61869-5
CAPACITIVE VOLTAGE TRANSFORMERS
GENERAL
REQUIREMENTS
ADDITIONAL REQUIREMENTS FOR 60044-7
FOR 61869-6 61869-7
ELECTRONIC VOLTAGE
INSTRUMENT
ADDITIONAL
TRANSFORMERS
TRANSFORMERS
GENERAL
REQUIREMENT
ADDITIONAL REQUIREMENTS FOR 60044-8
61869-8
FOR
ELECTRONIC CURRENT
ELECTRONIC
TRANSFORMERS
INSTRUMENT
TRANSFORMERS
DIGITAL INTERFACE FOR INSTRUMENT
AND LOW 61869-9
TRANSFORMERS
POWER STAND
ALONE
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW-
61869-10
POWER STAND-ALONE CURRENT
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW 60044-7
61869-11
POWER STAND ALONE VOLTAGE
SENSOR
ADDITIONAL REQUIREMENTS FOR
61869-12
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED STAND
ALONE SENSORS
STAND ALONE MERGING UNIT
61869-13
__________
Endorsement notice
The text of the International Standard IEC 61869-5:2011 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60422 NOTE Harmonized as EN 60422.
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Annex ZA of EN 61869-1:2009 applies with the following additions:
Publication Year Title EN/HD Year
IEC 60038 (mod) 2009 IEC standard voltages EN 60038 2011
IEC 60050-436 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 436: Power capacitors
IEC 60050-601 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 601: Generation, transmission and
distribution of electricity - General
IEC 60050-604 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 604: Generation, transmission and
distribution of electricity - Operation
IEC 60060-1 - High-voltage test techniques - EN 60060-1 -
Part 1: General definitions and test
requirements
IEC 60358 - Coupling capacitors and capacitor dividers HD 597 S1 -
IEC 60481 - Coupling devices for power line carrier - -
systems
IEC 61869-1 (mod) 2007 Instrument transformers - EN 61869-1 2009
Part 1: General requirements
IEC 61869-5 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Instrument transformers –
Part 5: Additional requirements for capacitor voltage transformers
Transformateurs de mesure –
Partie 5: Exigences supplémentaires concernant les transformateurs
condensateurs de tension
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 17.220.20 ISBN 978-2-88912-543-2
– 2 – 61869-5 IEC:2011
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references . 8
3 Terms and Definitions . 8
3.1 General definitions .9
3.2 Definitions related to dielectric ratings and voltages . 14
3.4 Definitions related to accuracy . 14
3.5 Definitions related to other ratings . 14
3.7 Index of abbreviations . 15
5 Ratings . 15
5.3 Rated insulation levels . 16
5.3.3 Other requirements for primary terminals insulation . 16
5.3.5 Insulation requirements for secondary terminals. 17
5.3.501 Electromagnetic unit insulation requirements . 17
5.4 Rated frequency . 17
5.5 Rated output . 17
5.5.501 Rated output values . 17
5.5.502 Rated thermal limiting output . 18
5.5.503 Rated output values for residual voltage windings . 18
5.5.504 Rated thermal limiting output for residual voltage windings . 18
5.6 Rated accuracy class . 18
5.6.501 Accuracy requirements for measuring capacitor voltage transformer . 18
5.6.502 Accuracy requirements for protective capacitor voltage transformers . 19
5.501 Standard values of rated voltages . 20
5.501.1 Rated primary voltages U . 20
Pr
5.501.2 Rated secondary voltages . 20
5.501.3 Rated voltages for secondary winding intended to produce a residual
voltage . 21
5.501.4 Standard values of rated voltage factor . 21
6 Design and construction . 22
6.1 Requirements for liquids used in equipment . 22
6.1.4 Liquid tightness . 22
6.7 Mechanical requirements . 22
6.8 Multiple chopped impulse on primary terminals . 22
6.9 Internal arc fault protection requirements . 22
6.13 Markings . 22
6.13.501 Terminal markings . 22
6.13.502 Rating plate markings . 23
6.501 Short circuit withstand capability . 27
6.502 Ferro-resonance. 27
6.502.1 General . 27
6.502.2 Transients of ferro-resonance oscillations . 27
6.503 Transient response . 28
6.503.1 General . 28
6.503.2 Requirements for transient response . 28
6.503.3 Standard transient response classes . 28
61869-5 IEC:2011 – 3 –
6.504 Requirements for carrier – frequency accessories . 29
6.504.1 General . 29
6.504.2 Drain coil . 29
6.504.3 Voltage limitation device . 29
7 Tests . 30
7.1 General . 30
7.1.2 List of tests. 30
7.1.3 Sequence of tests . 31
7.2 Type tests . 33
7.2.2 Temperature-rise test . 33
7.2.3 Impulse voltage withstand test on primary terminals. 34
7.2.4 Wet test for outdoor type transformers . 35
7.2.6 Test for accuracy . 35
7.2.8 Enclosure tightness test at ambient temperature . 37
7.2.501 Capacitance and tanδ measurement at power-frequency . 37
7.2.502 Short-circuit withstand capability test . 38
7.2.503 Ferro-resonance tests . 39
7.2.504 Transient response test . 39
7.2.505 Type test for carrier frequency accessories . 41
7.3 Routine tests . 42
7.3.1 Power-frequency voltage withstand tests on primary terminals . 42
7.3.2 Partial discharge measurement . 44
7.3.5 Test for accuracy . 44
7.3.7 Enclosure tightness test at ambient temperature . 46
7.3.8 Pressure test for the enclosure . 46
7.3.501 Ferro-resonance check . 46
7.3.502 Routine tests for carrier frequency accessories . 46
7.4 Special tests . 47
7.4.1 Chopped impulse voltage withstand test on primary terminals . 47
7.4.2 Multiple chopped impulse test on primary terminals . 47
7.4.3 Measurement of capacitance and dielectric dissipation factor . 47
7.4.6 Internal arc fault test . 47
7.4.501 Determination of the temperature coefficient (TC) . 47
7.4.502 Tightness design test of capacitor units . 47
Annex 5A (normative) Typical diagrammeme of a capacitor voltage transformer . 49
Annex 5B (informative) Transient response of capacitor voltage transformer under
fault conditions . 50
Annex 5C (normative) High-frequency characteristics of capacitor voltage
transformers . 51
Bibliography . 52
Figure 501 – Error diagram of a capacitor voltage transformer for accuracy classes
0,2, 0,5 and 1,0 . 19
Figure 502 – Capacitor voltage transformer with a single secondary . 23
Figure 503 – Capacitor voltage transformer with two secondaries . 23
Figure 504 – Capacitor voltage transformer with two tapped secondaries . 23
Figure 505– Capacitor voltage transformer with one residual voltage winding and a
single secondary . 23
– 4 – 61869-5 IEC:2011
Figure 506 – Example of a typical rating plate . 26
Figure 507 – Transient response of a capacitor voltage transformer . 28
Figure 508 – Flow charts test sequence to be applied when performing type test
(Figure 508a) and routine test (Figure 508b) . 32
Figure 509 – Diagram of a capacitor voltage transformer for the transient response test
using equivalent circuit method . 40
Figure 510 – Series burden . 41
Figure 511 – Pure resistance . 41
Figure 512 – Example of an error diagramme of class 1 CVT for accuracy check with
the equivalent circuit . 45
Figure 5A.1 – Example of a diagram for a capacitor voltage transformer . 49
Figure 5A.2 – Example of a diagram for a capacitor voltage transformer with carrier-
frequency accessories . 49
Table 501 – Limits of voltage error and phase displacement for measuring capacitor
voltage transformers . 19
Table 502 – Limits of voltage error and phase displacement for protective capacitor
voltage transformers . 20
Table 503 – Rated secondary voltages for capacitor voltage transformers to produce a
residual voltage . 21
Table 504 – Standard values of rated voltage factors for accuracy and thermal
requirements . 21
Table 505 – Marking of the rating plate . 23
Table 506a – Ferro-resonance requirements . 27
Table 506b – Ferro-resonance requirements . 28
Table 507 – Standard transient response values and classes . 29
Table 10 – List of tests . 31
Table 508 – Test voltage for temperature rise test . 34
Table 509– Burden ranges for accuracy tests . 36
Table 510 – Test voltages for units, stacks and complete capacitor voltage divider . 43
Table 511 – Accuracy check points (example) . 45
Table 512 – Ferro resonance check . 46
61869-5 IEC:2011 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 5: Additional requirements for capacitor voltage 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.
This International Standard IEC 61869-5 specific clauses for capacitor voltage transformers
has been prepared by IEC technical committee 38: Instrument transformers.
This standard replaces IEC 60044-5 regarding capacitor voltage transformers as well as IEC-
PAS 60044-5 for capacitor voltage transformers.
– 6 – 61869-5 IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
38/411/FDIS 38/414/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is Part 5 of IEC 61869, published under the general title Instrument
transformers.
This part 5 is to be read in conjunction with, and is based on, IEC 61869-1, General
Requirements – first edition (2007) – however the reader is encouraged to use its most recent
edition.
This Part 5 follows the structure of IEC 61869-1 and supplements or modifies its
corresponding clauses.
When a particular clause/subclause of Part 1 is not mentioned in this Part 5, 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 note, the following numbering
system is used:
– clauses, subclauses, tables and figures and notes that are numbered starting from 501 are
additional to those in Part 1;
– additional annexes are lettered 5A, 5B, 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 TC38 is available at the website:
www.iec.ch.
61869-5 IEC:2011 – 7 –
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
ADDITIONAL REQUIREMENTS FOR 60044-1
61869-2
CURRENT TRANSFORMERS
60044-6
ADDITIONAL REQUIREMENTS FOR 60044-2
61869-3
INDUCTIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-3
61869-4
COMBINED TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-5
61869-5
CAPACITIVE VOLTAGE TRANSFORMERS
61869-1
ADDITIONAL REQUIREMENTS FOR 60044-7
61869-6 61869-7
ELECTRONIC VOLTAGE
GENERAL
TRANSFORMERS
REQUIREMENTS
ADDITIONAL
FOR
GENERAL
INSTRUMENT REQUIREMENT ADDITIONAL REQUIREMENTS FOR 60044-8
61869-8
TRANSFORMERS ELECTRONIC CURRENT
FOR
TRANSFORMERS
ELECTRONIC
INSTRUMENT
TRANSFORMERS
DIGITAL INTERFACE FOR INSTRUMENT
61869-9
AND LOW
TRANSFORMERS
POWER STAND
ALONE
ADDITIONAL REQUIREMENTS FOR LOW-
61869-10
SENSORS
POWER STAND-ALONE CURRENT
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW 60044-7
61869-11
POWER STAND ALONE VOLTAGE
SENSOR
ADDITIONAL REQUIREMENTS FOR
61869-12
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED STAND
ALONE SENSORS
STAND ALONE MERGING UNIT
61869-13
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.
– 8 – 61869-5 IEC:2011
INSTRUMENT TRANSFORMERS –
Part 5: Additional requirements for capacitor voltage transformers
1 Scope
This part of IEC 61869 applies to new single-phase capacitor voltage transformers connected
between line and ground for system voltages U ≥ 72,5 kV at power frequencies from 15 Hz
m
to 100 Hz. They are intended to supply a low voltage for measurement, control and protective
functions.
The capacitor voltage transformer can be equipped with or without carrier-frequency
accessories for power line carrier-frequency (PLC) application at carrier frequencies from
30 kHz to 500 kHz.
The base requirements for coupling capacitors and capacitors dividers are defined in
IEC 60358. The transmission requirements for coupling devices for power line carrier (PLC)
system are defined in IEC 60481.
The measurement application includes both indication measuring and revenue measuring.
NOTE 501 Diagrams of capacitor voltage transformer to which this standard applies are given in Figures 5A.1 and
5A.2.
2 Normative references
Clause 2 of IEC 61869-1:2007 is applicable with the following additions:
IEC 61869-1:2007, Instrument transformers – Part 1: General requirements
IEC 60038 ed7.0 (2009-06) – IEC standard voltages
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60050-436, International Electrotechnical Vocabulary (IEV) – Chapter 436: Power
capacitors
IEC 60050-601, International Electrotechnical Vocabulary (IEV) – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60050-604, International Electrotechnical Vocabulary (IEV) – Chapter 604: Generation,
transmission and distribution of electricity – Operation
IEC 60358, Coupling capacitors and capacitor dividers
IEC 60481, Coupling devices for power line carrier systems
3 Terms and Definitions
For the purpose of this document, the terms and definitions of IEC 61869-1 apply with the
following additions:
61869-5 IEC:2011 – 9 –
3.1 General definitions
3.1.501
capacitor voltage transformer
CVT
voltage transformer comprising a capacitor divider unit and an electromagnetic unit so
designed and interconnected that the secondary voltage of the electromagnetic unit is
substantially proportional to the primary voltage, and differs in phase from it by an angle
which is approximately zero for an appropriate direction of the connections.
[IEC 60050-321:1986, 321-03-14, modified]
3.1.502
measuring voltage transformer
voltage transformer intended to transmit an information signal to measuring instruments,
integrating meters and similar apparatus
[IEC 60050-321:1986 , 321-03-04 modified]
3.1.503
protective voltage transformer
voltage transformer intended to transmit an information signal to electrical protective and
control devices
[IEC 60050-321:1986 , 321-03-05]
3.1.504
secondary winding
winding which supplies the voltage circuits of measuring instruments, meters, protective or
control devices
[IEC 60050-321:1986, 321-01-07 modified]
3.1.505
residual voltage winding
winding of a single-phase capacitor voltage transformer intended, in a set of three single-
phase transformers, for connection in broken delta for the purpose of producing a residual
voltage under earth-fault conditions.
[IEC 60050-321:1986, 321-03-11]
3.1.506
rated temperature category of a capacitor voltage transformer
range of temperature of the ambient air or of the cooling medium for which the capacitor
voltage transformer has been designed
3.1.507
line terminal
terminal intended for connection to a line conductor of a network
[IEC 60050-436:1986, 436-03-01]
3.1.508
ferro-resonance
sustained resonance of a circuit consisting of a capacitance with a non-linear saturable
magnetic inductance and a voltage ac-source for excitation
NOTE 501 The ferro-resonance can be initiated by switching operations on the primary side or secondary side.
– 10 – 61869-5 IEC:2011
3.1.509
transient response
measured fidelity of the secondary-voltage waveform, compared with the voltage waveform at
the high-voltage terminal under transient conditions
3.1.510
voltage-connected CVT
CVT which has only one connection to the high voltage line
NOTE 501 Under normal conditions the top connection carries only the current of the capacitor voltage
transformer.
3.1.511
current-connected CVT
CVT which has two connections to the high voltage line
NOTE 501 The terminals and the top connection are designed to carry the line current under normal conditions.
3.1.512
line trap-connected CVT
CVT which supports a line trap on its top
3.1.513
capacitor
two terminal device characterized essentially by its capacitance
[IEC 60050-151:2001, 151-13-28]
3.1.514
(capacitor) element
device consisting essentially of two electrodes separated by a dielectric
[IEC 60050-436:1986, 436-01-03]
3.1.515
(capacitor) unit
assembly of one or more capacitor elements in the same container with terminals brought out
[IEC 60050-436:1986, 436-01-04]
NOTE 501 A common type of unit for coupling capacitors has a cylindrical housing of insulating material and
metallic flanges which serve as terminals.
3.1.516
(capacitor) stack
an assembly of capacitor units connected in series
[IEC 60050-436:1986, 436-01-05]
NOTE 501 The capacitor units are usually mounted in a vertical array.
3.1.517
capacitor voltage divider
capacitor stack forming an alternating voltage divider
[IEC 60050-436:1986, 436-02-10]
3.1.518
rated capacitance of a capacitor
C
r
the capacitance value for which the capacitor has been designed
61869-5 IEC:2011 – 11 –
NOTE 501 This definition applies:
• for a capacitor unit, to the capacitance between the terminals of the unit;
• for a capacitor stack, to the capacitance between line and low voltage terminals or between line and earth
terminals of the stack;
• for a capacitor divider, to the resultant capacitance: C =C x C /(C + C ).
r 1 2 1 2
3.1.519
coupling capacitor
capacitor used for the transmission of signals in a power system
[IEV 60050-436:1986, 436-02-11]
3.1.520
high voltage capacitor (of a capacitor divider)
C
capacitor connected between the high voltage terminal and the intermediate voltage terminal
of a capacitor divider
[IEC 60050-436:1986, 436-02-12]
3.1.521
intermediate voltage capacitor (of a capacitor divider)
C
capacitor connected between the intermediate voltage and the low voltage terminals of a
capacitor divider
[IEC 60050-436:1986, 436-02-13]
3.1.522
intermediate voltage terminal (of a capacitor divider)
terminal intended for connection to an intermediate circuit such as the electromagnetic unit of
a capacitor voltage transformer
[IEC 60050-436:1986, 436-03-03]
3.1.523
low voltage terminal of a capacitor divider
terminal intended for connection to earth either directly or via an impedance of negligible
value at network frequency.
NOTE 501 in a coupling capacitor, this terminal is connected to the signal transmitting device.
[IEC 60050-436:1986, C 436-03-04]
3.1.524
capacitance tolerance
permissible difference between the actual capacitance and the rated capacitance under
specified conditions
[IEC 60050-436:1986, 436-04-01]
3.1.525
equivalent series resistance of a capacitor
virtual resistance which, if connected in series with an ideal capacitor of capacitance value
equal to that of the capacitor in question, would have a power loss equal to the active power
dissipated in that capacitor under specified operating conditions at a given high frequency
– 12 – 61869-5 IEC:2011
3.1.526
high frequency capacitance (of a capacitor)
effective capacitance at a given frequency resulting from the joint effect of the intrinsic
capacitance and the self-inductance of the capacitor
[IEC 60050-436:1986, 436-04-03]
3.1.527
intermediate voltage of a capacitor divider
U
C
voltage between the intermediate voltage terminal of the capacitor divider and the low voltage
terminal, when the primary voltage is applied between the high and low voltage terminals or
high voltage terminal and earth terminal
3.1.528
voltage ratio (of a capacitor divider)
K
C
ratio of the voltage applied to the capacitor divider to the open-circuit intermediate voltage
[IEC 60050-436:1986, 436-04-05]
NOTE 501 This ratio corresponds to the sum of the capacitances of the high voltage and intermediate voltage
capacitors divided by the capacitance of the high voltage capacitor: (C + C ) / C = K .
1 2 1 C
NOTE 502 C and C include the stray capacitances, which are generally negligible.
1 2
3.1.529
capacitor losses
active power dissipated in the capacitor
[IEC 60050-436:1986, 436-04-10]
3.1.530
tangent of the loss angle (tanδ) of a capacitor
ratio between the active power P and the reactive power P : tanδ = P /P
a r a r
3.1.531
temperature coefficient of capacitance
T
C
fractional change of the capacitance for a given change in temperature:
∆C 1
T =
C
∆T× C K
20°
∆C represents the observed change in capacitance over the temperature interval ∆T
C represents the capacitance measured at 20 °C
20°
NOTE 501 The term ∆C/∆T according to this definition is usable only if the capacitance is an approximate linear
function of the temperature in the range under consideration. If not, the temperature dependency of the
capacitance should be shown in a graph or a table.
3.1.532
stray capacitance of the low voltage terminal
stray capacitance between the low voltage terminal and the earth terminal
3.1.533
stray conductance of the low voltage terminal
stray conductance between the low voltage terminal and the earth terminal
61869-5 IEC:2011 – 13 –
3.1.534
dielectric of a capacitor
insulating material between the electrodes
3.1.535
electromagnetic unit
component of a capacitor voltage transformer, connected between the intermediate voltage
terminal and the earth terminal of the capacitor divider (or possibly directly connected to earth
when a carrier-frequency coupling device is used) which supplies the secondary voltage
NOTE 501 An electromagnetic unit typically comprises a transformer to reduce the intermediate voltage to the
required value of secondary voltage, and a compensating inductance. The reactance L·(2πf ) of the compensating
R
inductance must be approximately equal at rated frequency f to the capacitive reactance
R
1/[2πf ·(C +C )] of the two parts of the divider connected in parallel. The compensating inductance may be
R 1 2
incorporated wholly or partially in the transformer.
3.1.536
intermediate transformer
voltage transformer in which the secondary voltage, in normal conditions of use, is
substantially proportional to the primary voltage
3.1.537
compensating inductance
L
inductance which is usually connected between the intermediate terminal and the high voltage
terminal of the primary winding of the intermediate transformer or between earth terminal and
the earth-side terminal of the primary winding of the intermediate transformer or incorporated
in the primary and secondary windings of the intermediate transformer
NOTE 501 The design value L of the inductance is: L=
(C +C )×(2π f )
1 2 R
3.1.538
damping device
device incorporated in the electromagnetic unit for the purposes of:
a) limiting overvoltages which may appear across one or more components;
b) and/or to prevent sustained ferro-resonance;
c) and or to achieve a higher performance of the transient response of the capacitor voltage
transformer
3.1.539
carrier-frequency accessories
circuit element intended to permit the injection of carrier frequency signal and which is
connected between the low voltage terminal of a capacitor divider unit and earth, having an
impedance which is insignificant at power frequency, but appreciable at the carrier frequency
(see Figure 5A.2)
3.1.540
drain coil
inductance which is connected between the low voltage terminal of a capacitor divider and
earth, and whose impedance is insignificant at power frequency, but has a high value at the
carrier frequency
3.1.541
voltage limitation element
element connected across the drain coil or between low voltage terminal of the capacitor
voltage divider and earth to limit the transient overvoltages which may appear across the
drain coil
– 14 – 61869-5 IEC:2011
NOTE 501 Examples of possible overvoltage causes are:
a) short circuit between the high-voltage terminal and earth;
b) in the case where an impulse voltage is applied between the high voltage terminal and earth;
c) line disconnectors operation.
3.1.542
carrier earthing switch
switch for earthing, when necessary, of the low voltage terminal
3.2 Definitions related to dielectric ratings and voltages
3.2.501
rated primary voltage
U
Pr
value of the primary voltage which appears in the designation of the voltage transformer and
on which its performance is based
[IEC 60050-321:1986, C321-01-12]
3.2.502
rated secondary voltage
U
Sr
value of the secondary voltage which appears in the designation of the voltage transformer
and on which its performance is based
[IEC 60050-321:1986, C 321-01-16]
3.2.503
rated voltage factor
F
V
multiplying factor to be applied to the rated primary voltage U to determine the maximum
Pr
voltage at which a transformer must comply with the relevant thermal requirements for a
specified time and with the relevant accuracy requirements
[IEC 60050-321:1986, C 321-03-12]
3.4 Definitions related to accuracy
3.4.3
ratio error
ε
subclause 3.4.3 of IEC 61869-1 is applicable with
...
SLOVENSKI STANDARD
01-januar-2012
Merilni transformatorji - 5. del: Posebne zahteve za kapacitivne napetostne
transformatorje
Instrument transformers - Part 5: Specific requirements for capacitive voltage
transformers
Messwandler - Teil 5: Zusätzliche Anforderungen für kapazitive Spannungswandler
Transformateurs de mesure - Partie 5: Exigences additionnelles pour transformateurs
capacitifs de tension
Ta slovenski standard je istoveten z: EN 61869-5:2011
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN 61869-5
NORME EUROPÉENNE
October 2011
EUROPÄISCHE NORM
ICS 17.220.20 Supersedes EN 60044-5:2004
English version
Instrument transformers -
Part 5: Additional requirements for capacitor voltage transformers
(IEC 61869-5:2011)
Transformateurs de mesure - Messwandler -
Partie 5: Exigences supplémentaires Teil 5: Zusätzliche Anforderungen für
concernant les transformateurs kapazitive Spannungswandler
condensateurs de tension (IEC 61869-5:2011)
(CEI 61869-5:2011)
This European Standard was approved by CENELEC on 2011-08-17. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61869-5:2011 E
Foreword
The text of document 38/411/FDIS, future edition 1 of IEC 61869-5, prepared by IEC/TC 38, "Instrument
transformers", was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
The following dates are fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-05-17
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-08-17
This European Standard supersedes EN 60044-5:2004 regarding capacitor voltage transformers.
transformers - General Requirements.
This Part 5 follows the structure of EN 61869-1 and supplements or modifies its corresponding clauses.
When a particular clause/subclause of Part 1 is not mentioned in this Part 5, that clause/subclause
applies as far as is reasonable. When this standard states “addition”, “modification” or “replacement”, the
relevant text in Part 1 shall 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 501 are additional to
those in Part 1;
– additional annexes are lettered 5A, 5B, etc.
Annex ZZ of EN 61869-1 is not applicable for this part of the series.
An overview of the planned set of standards at the date of publication of this document is given
below. The updated list of standards prepared by IEC TC38 is available at the website:
www.iec.ch.
The updated list of standards prepared by IEC TC38 and approved by CENELEC is available at
the website: www.cenelec.eu.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
- 3 - EN 61869-5:2011
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
61869-2 ADDITIONAL REQUIREMENTS FOR 60044-1
CURRENT TRANSFORMERS
61869-3 ADDITIONAL REQUIREMENTS FOR 60044-2
INDUCTIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-3
61869-4
COMBINED TRANSFORMERS
61869-1 ADDITIONAL REQUIREMENTS FOR 60044-5
61869-5
CAPACITIVE VOLTAGE TRANSFORMERS
GENERAL
REQUIREMENTS
ADDITIONAL REQUIREMENTS FOR 60044-7
FOR 61869-6 61869-7
ELECTRONIC VOLTAGE
INSTRUMENT
ADDITIONAL
TRANSFORMERS
TRANSFORMERS
GENERAL
REQUIREMENT
ADDITIONAL REQUIREMENTS FOR 60044-8
61869-8
FOR
ELECTRONIC CURRENT
ELECTRONIC
TRANSFORMERS
INSTRUMENT
TRANSFORMERS
DIGITAL INTERFACE FOR INSTRUMENT
AND LOW 61869-9
TRANSFORMERS
POWER STAND
ALONE
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW-
61869-10
POWER STAND-ALONE CURRENT
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW 60044-7
61869-11
POWER STAND ALONE VOLTAGE
SENSOR
ADDITIONAL REQUIREMENTS FOR
61869-12
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED STAND
ALONE SENSORS
STAND ALONE MERGING UNIT
61869-13
__________
Endorsement notice
The text of the International Standard IEC 61869-5:2011 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60422 NOTE Harmonized as EN 60422.
__________
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application 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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Annex ZA of EN 61869-1:2009 applies with the following additions:
Publication Year Title EN/HD Year
IEC 60038 (mod) 2009 IEC standard voltages EN 60038 2011
IEC 60050-436 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 436: Power capacitors
IEC 60050-601 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 601: Generation, transmission and
distribution of electricity - General
IEC 60050-604 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 604: Generation, transmission and
distribution of electricity - Operation
IEC 60060-1 - High-voltage test techniques - EN 60060-1 -
Part 1: General definitions and test
requirements
IEC 60358 - Coupling capacitors and capacitor dividers HD 597 S1 -
IEC 60481 - Coupling devices for power line carrier - -
systems
IEC 61869-1 (mod) 2007 Instrument transformers - EN 61869-1 2009
Part 1: General requirements
IEC 61869-5 ®
Edition 1.0 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Instrument transformers –
Part 5: Additional requirements for capacitor voltage transformers
Transformateurs de mesure –
Partie 5: Exigences supplémentaires concernant les transformateurs
condensateurs de tension
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XA
ICS 17.220.20 ISBN 978-2-88912-543-2
– 2 – 61869-5 IEC:2011
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references . 8
3 Terms and Definitions . 8
3.1 General definitions .9
3.2 Definitions related to dielectric ratings and voltages . 14
3.4 Definitions related to accuracy . 14
3.5 Definitions related to other ratings . 14
3.7 Index of abbreviations . 15
5 Ratings . 15
5.3 Rated insulation levels . 16
5.3.3 Other requirements for primary terminals insulation . 16
5.3.5 Insulation requirements for secondary terminals. 17
5.3.501 Electromagnetic unit insulation requirements . 17
5.4 Rated frequency . 17
5.5 Rated output . 17
5.5.501 Rated output values . 17
5.5.502 Rated thermal limiting output . 18
5.5.503 Rated output values for residual voltage windings . 18
5.5.504 Rated thermal limiting output for residual voltage windings . 18
5.6 Rated accuracy class . 18
5.6.501 Accuracy requirements for measuring capacitor voltage transformer . 18
5.6.502 Accuracy requirements for protective capacitor voltage transformers . 19
5.501 Standard values of rated voltages . 20
5.501.1 Rated primary voltages U . 20
Pr
5.501.2 Rated secondary voltages . 20
5.501.3 Rated voltages for secondary winding intended to produce a residual
voltage . 21
5.501.4 Standard values of rated voltage factor . 21
6 Design and construction . 22
6.1 Requirements for liquids used in equipment . 22
6.1.4 Liquid tightness . 22
6.7 Mechanical requirements . 22
6.8 Multiple chopped impulse on primary terminals . 22
6.9 Internal arc fault protection requirements . 22
6.13 Markings . 22
6.13.501 Terminal markings . 22
6.13.502 Rating plate markings . 23
6.501 Short circuit withstand capability . 27
6.502 Ferro-resonance. 27
6.502.1 General . 27
6.502.2 Transients of ferro-resonance oscillations . 27
6.503 Transient response . 28
6.503.1 General . 28
6.503.2 Requirements for transient response . 28
6.503.3 Standard transient response classes . 28
61869-5 IEC:2011 – 3 –
6.504 Requirements for carrier – frequency accessories . 29
6.504.1 General . 29
6.504.2 Drain coil . 29
6.504.3 Voltage limitation device . 29
7 Tests . 30
7.1 General . 30
7.1.2 List of tests. 30
7.1.3 Sequence of tests . 31
7.2 Type tests . 33
7.2.2 Temperature-rise test . 33
7.2.3 Impulse voltage withstand test on primary terminals. 34
7.2.4 Wet test for outdoor type transformers . 35
7.2.6 Test for accuracy . 35
7.2.8 Enclosure tightness test at ambient temperature . 37
7.2.501 Capacitance and tanδ measurement at power-frequency . 37
7.2.502 Short-circuit withstand capability test . 38
7.2.503 Ferro-resonance tests . 39
7.2.504 Transient response test . 39
7.2.505 Type test for carrier frequency accessories . 41
7.3 Routine tests . 42
7.3.1 Power-frequency voltage withstand tests on primary terminals . 42
7.3.2 Partial discharge measurement . 44
7.3.5 Test for accuracy . 44
7.3.7 Enclosure tightness test at ambient temperature . 46
7.3.8 Pressure test for the enclosure . 46
7.3.501 Ferro-resonance check . 46
7.3.502 Routine tests for carrier frequency accessories . 46
7.4 Special tests . 47
7.4.1 Chopped impulse voltage withstand test on primary terminals . 47
7.4.2 Multiple chopped impulse test on primary terminals . 47
7.4.3 Measurement of capacitance and dielectric dissipation factor . 47
7.4.6 Internal arc fault test . 47
7.4.501 Determination of the temperature coefficient (TC) . 47
7.4.502 Tightness design test of capacitor units . 47
Annex 5A (normative) Typical diagrammeme of a capacitor voltage transformer . 49
Annex 5B (informative) Transient response of capacitor voltage transformer under
fault conditions . 50
Annex 5C (normative) High-frequency characteristics of capacitor voltage
transformers . 51
Bibliography . 52
Figure 501 – Error diagram of a capacitor voltage transformer for accuracy classes
0,2, 0,5 and 1,0 . 19
Figure 502 – Capacitor voltage transformer with a single secondary . 23
Figure 503 – Capacitor voltage transformer with two secondaries . 23
Figure 504 – Capacitor voltage transformer with two tapped secondaries . 23
Figure 505– Capacitor voltage transformer with one residual voltage winding and a
single secondary . 23
– 4 – 61869-5 IEC:2011
Figure 506 – Example of a typical rating plate . 26
Figure 507 – Transient response of a capacitor voltage transformer . 28
Figure 508 – Flow charts test sequence to be applied when performing type test
(Figure 508a) and routine test (Figure 508b) . 32
Figure 509 – Diagram of a capacitor voltage transformer for the transient response test
using equivalent circuit method . 40
Figure 510 – Series burden . 41
Figure 511 – Pure resistance . 41
Figure 512 – Example of an error diagramme of class 1 CVT for accuracy check with
the equivalent circuit . 45
Figure 5A.1 – Example of a diagram for a capacitor voltage transformer . 49
Figure 5A.2 – Example of a diagram for a capacitor voltage transformer with carrier-
frequency accessories . 49
Table 501 – Limits of voltage error and phase displacement for measuring capacitor
voltage transformers . 19
Table 502 – Limits of voltage error and phase displacement for protective capacitor
voltage transformers . 20
Table 503 – Rated secondary voltages for capacitor voltage transformers to produce a
residual voltage . 21
Table 504 – Standard values of rated voltage factors for accuracy and thermal
requirements . 21
Table 505 – Marking of the rating plate . 23
Table 506a – Ferro-resonance requirements . 27
Table 506b – Ferro-resonance requirements . 28
Table 507 – Standard transient response values and classes . 29
Table 10 – List of tests . 31
Table 508 – Test voltage for temperature rise test . 34
Table 509– Burden ranges for accuracy tests . 36
Table 510 – Test voltages for units, stacks and complete capacitor voltage divider . 43
Table 511 – Accuracy check points (example) . 45
Table 512 – Ferro resonance check . 46
61869-5 IEC:2011 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INSTRUMENT TRANSFORMERS –
Part 5: Additional requirements for capacitor voltage 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.
This International Standard IEC 61869-5 specific clauses for capacitor voltage transformers
has been prepared by IEC technical committee 38: Instrument transformers.
This standard replaces IEC 60044-5 regarding capacitor voltage transformers as well as IEC-
PAS 60044-5 for capacitor voltage transformers.
– 6 – 61869-5 IEC:2011
The text of this standard is based on the following documents:
FDIS Report on voting
38/411/FDIS 38/414/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard is Part 5 of IEC 61869, published under the general title Instrument
transformers.
This part 5 is to be read in conjunction with, and is based on, IEC 61869-1, General
Requirements – first edition (2007) – however the reader is encouraged to use its most recent
edition.
This Part 5 follows the structure of IEC 61869-1 and supplements or modifies its
corresponding clauses.
When a particular clause/subclause of Part 1 is not mentioned in this Part 5, 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 note, the following numbering
system is used:
– clauses, subclauses, tables and figures and notes that are numbered starting from 501 are
additional to those in Part 1;
– additional annexes are lettered 5A, 5B, 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 TC38 is available at the website:
www.iec.ch.
61869-5 IEC:2011 – 7 –
PRODUCT FAMILY STANDARDS PRODUCT PRODUCTS OLD
STANDARD STANDARD
ADDITIONAL REQUIREMENTS FOR 60044-1
61869-2
CURRENT TRANSFORMERS
60044-6
ADDITIONAL REQUIREMENTS FOR 60044-2
61869-3
INDUCTIVE VOLTAGE TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-3
61869-4
COMBINED TRANSFORMERS
ADDITIONAL REQUIREMENTS FOR 60044-5
61869-5
CAPACITIVE VOLTAGE TRANSFORMERS
61869-1
ADDITIONAL REQUIREMENTS FOR 60044-7
61869-6 61869-7
ELECTRONIC VOLTAGE
GENERAL
TRANSFORMERS
REQUIREMENTS
ADDITIONAL
FOR
GENERAL
INSTRUMENT REQUIREMENT ADDITIONAL REQUIREMENTS FOR 60044-8
61869-8
TRANSFORMERS ELECTRONIC CURRENT
FOR
TRANSFORMERS
ELECTRONIC
INSTRUMENT
TRANSFORMERS
DIGITAL INTERFACE FOR INSTRUMENT
61869-9
AND LOW
TRANSFORMERS
POWER STAND
ALONE
ADDITIONAL REQUIREMENTS FOR LOW-
61869-10
SENSORS
POWER STAND-ALONE CURRENT
SENSORS
ADDITIONAL REQUIREMENTS FOR LOW 60044-7
61869-11
POWER STAND ALONE VOLTAGE
SENSOR
ADDITIONAL REQUIREMENTS FOR
61869-12
COMBINED ELECTRONIC INSTRUMENT
TRANSFORMER OR COMBINED STAND
ALONE SENSORS
STAND ALONE MERGING UNIT
61869-13
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.
– 8 – 61869-5 IEC:2011
INSTRUMENT TRANSFORMERS –
Part 5: Additional requirements for capacitor voltage transformers
1 Scope
This part of IEC 61869 applies to new single-phase capacitor voltage transformers connected
between line and ground for system voltages U ≥ 72,5 kV at power frequencies from 15 Hz
m
to 100 Hz. They are intended to supply a low voltage for measurement, control and protective
functions.
The capacitor voltage transformer can be equipped with or without carrier-frequency
accessories for power line carrier-frequency (PLC) application at carrier frequencies from
30 kHz to 500 kHz.
The base requirements for coupling capacitors and capacitors dividers are defined in
IEC 60358. The transmission requirements for coupling devices for power line carrier (PLC)
system are defined in IEC 60481.
The measurement application includes both indication measuring and revenue measuring.
NOTE 501 Diagrams of capacitor voltage transformer to which this standard applies are given in Figures 5A.1 and
5A.2.
2 Normative references
Clause 2 of IEC 61869-1:2007 is applicable with the following additions:
IEC 61869-1:2007, Instrument transformers – Part 1: General requirements
IEC 60038 ed7.0 (2009-06) – IEC standard voltages
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60050-436, International Electrotechnical Vocabulary (IEV) – Chapter 436: Power
capacitors
IEC 60050-601, International Electrotechnical Vocabulary (IEV) – Chapter 601: Generation,
transmission and distribution of electricity – General
IEC 60050-604, International Electrotechnical Vocabulary (IEV) – Chapter 604: Generation,
transmission and distribution of electricity – Operation
IEC 60358, Coupling capacitors and capacitor dividers
IEC 60481, Coupling devices for power line carrier systems
3 Terms and Definitions
For the purpose of this document, the terms and definitions of IEC 61869-1 apply with the
following additions:
61869-5 IEC:2011 – 9 –
3.1 General definitions
3.1.501
capacitor voltage transformer
CVT
voltage transformer comprising a capacitor divider unit and an electromagnetic unit so
designed and interconnected that the secondary voltage of the electromagnetic unit is
substantially proportional to the primary voltage, and differs in phase from it by an angle
which is approximately zero for an appropriate direction of the connections.
[IEC 60050-321:1986, 321-03-14, modified]
3.1.502
measuring voltage transformer
voltage transformer intended to transmit an information signal to measuring instruments,
integrating meters and similar apparatus
[IEC 60050-321:1986 , 321-03-04 modified]
3.1.503
protective voltage transformer
voltage transformer intended to transmit an information signal to electrical protective and
control devices
[IEC 60050-321:1986 , 321-03-05]
3.1.504
secondary winding
winding which supplies the voltage circuits of measuring instruments, meters, protective or
control devices
[IEC 60050-321:1986, 321-01-07 modified]
3.1.505
residual voltage winding
winding of a single-phase capacitor voltage transformer intended, in a set of three single-
phase transformers, for connection in broken delta for the purpose of producing a residual
voltage under earth-fault conditions.
[IEC 60050-321:1986, 321-03-11]
3.1.506
rated temperature category of a capacitor voltage transformer
range of temperature of the ambient air or of the cooling medium for which the capacitor
voltage transformer has been designed
3.1.507
line terminal
terminal intended for connection to a line conductor of a network
[IEC 60050-436:1986, 436-03-01]
3.1.508
ferro-resonance
sustained resonance of a circuit consisting of a capacitance with a non-linear saturable
magnetic inductance and a voltage ac-source for excitation
NOTE 501 The ferro-resonance can be initiated by switching operations on the primary side or secondary side.
– 10 – 61869-5 IEC:2011
3.1.509
transient response
measured fidelity of the secondary-voltage waveform, compared with the voltage waveform at
the high-voltage terminal under transient conditions
3.1.510
voltage-connected CVT
CVT which has only one connection to the high voltage line
NOTE 501 Under normal conditions the top connection carries only the current of the capacitor voltage
transformer.
3.1.511
current-connected CVT
CVT which has two connections to the high voltage line
NOTE 501 The terminals and the top connection are designed to carry the line current under normal conditions.
3.1.512
line trap-connected CVT
CVT which supports a line trap on its top
3.1.513
capacitor
two terminal device characterized essentially by its capacitance
[IEC 60050-151:2001, 151-13-28]
3.1.514
(capacitor) element
device consisting essentially of two electrodes separated by a dielectric
[IEC 60050-436:1986, 436-01-03]
3.1.515
(capacitor) unit
assembly of one or more capacitor elements in the same container with terminals brought out
[IEC 60050-436:1986, 436-01-04]
NOTE 501 A common type of unit for coupling capacitors has a cylindrical housing of insulating material and
metallic flanges which serve as terminals.
3.1.516
(capacitor) stack
an assembly of capacitor units connected in series
[IEC 60050-436:1986, 436-01-05]
NOTE 501 The capacitor units are usually mounted in a vertical array.
3.1.517
capacitor voltage divider
capacitor stack forming an alternating voltage divider
[IEC 60050-436:1986, 436-02-10]
3.1.518
rated capacitance of a capacitor
C
r
the capacitance value for which the capacitor has been designed
61869-5 IEC:2011 – 11 –
NOTE 501 This definition applies:
• for a capacitor unit, to the capacitance between the terminals of the unit;
• for a capacitor stack, to the capacitance between line and low voltage terminals or between line and earth
terminals of the stack;
• for a capacitor divider, to the resultant capacitance: C =C x C /(C + C ).
r 1 2 1 2
3.1.519
coupling capacitor
capacitor used for the transmission of signals in a power system
[IEV 60050-436:1986, 436-02-11]
3.1.520
high voltage capacitor (of a capacitor divider)
C
capacitor connected between the high voltage terminal and the intermediate voltage terminal
of a capacitor divider
[IEC 60050-436:1986, 436-02-12]
3.1.521
intermediate voltage capacitor (of a capacitor divider)
C
capacitor connected between the intermediate voltage and the low voltage terminals of a
capacitor divider
[IEC 60050-436:1986, 436-02-13]
3.1.522
intermediate voltage terminal (of a capacitor divider)
terminal intended for connection to an intermediate circuit such as the electromagnetic unit of
a capacitor voltage transformer
[IEC 60050-436:1986, 436-03-03]
3.1.523
low voltage terminal of a capacitor divider
terminal intended for connection to earth either directly or via an impedance of negligible
value at network frequency.
NOTE 501 in a coupling capacitor, this terminal is connected to the signal transmitting device.
[IEC 60050-436:1986, C 436-03-04]
3.1.524
capacitance tolerance
permissible difference between the actual capacitance and the rated capacitance under
specified conditions
[IEC 60050-436:1986, 436-04-01]
3.1.525
equivalent series resistance of a capacitor
virtual resistance which, if connected in series with an ideal capacitor of capacitance value
equal to that of the capacitor in question, would have a power loss equal to the active power
dissipated in that capacitor under specified operating conditions at a given high frequency
– 12 – 61869-5 IEC:2011
3.1.526
high frequency capacitance (of a capacitor)
effective capacitance at a given frequency resulting from the joint effect of the intrinsic
capacitance and the self-inductance of the capacitor
[IEC 60050-436:1986, 436-04-03]
3.1.527
intermediate voltage of a capacitor divider
U
C
voltage between the intermediate voltage terminal of the capacitor divider and the low voltage
terminal, when the primary voltage is applied between the high and low voltage terminals or
high voltage terminal and earth terminal
3.1.528
voltage ratio (of a capacitor divider)
K
C
ratio of the voltage applied to the capacitor divider to the open-circuit intermediate voltage
[IEC 60050-436:1986, 436-04-05]
NOTE 501 This ratio corresponds to the sum of the capacitances of the high voltage and intermediate voltage
capacitors divided by the capacitance of the high voltage capacitor: (C + C ) / C = K .
1 2 1 C
NOTE 502 C and C include the stray capacitances, which are generally negligible.
1 2
3.1.529
capacitor losses
active power dissipated in the capacitor
[IEC 60050-436:1986, 436-04-10]
3.1.530
tangent of the loss angle (tanδ) of a capacitor
ratio between the active power P and the reactive power P : tanδ = P /P
a r a r
3.1.531
temperature coefficient of capacitance
T
C
fractional change of the capacitance for a given change in temperature:
∆C 1
T =
C
∆T× C K
20°
∆C represents the observed change in capacitance over the temperature interval ∆T
C represents the capacitance measured at 20 °C
20°
NOTE 501 The term ∆C/∆T according to this definition is usable only if the capacitance is an approximate linear
function of the temperature in the range under consideration. If not, the temperature dependency of the
capacitance should be shown in a graph or a table.
3.1.532
stray capacitance of the low voltage terminal
stray capacitance between the low voltage terminal and the earth terminal
3.1.533
stray conductance of the low voltage terminal
stray conductance between the low voltage terminal and the earth terminal
61869-5 IEC:2011 – 13 –
3.1.534
dielectric of a capacitor
insulating material between the electrodes
3.1.535
electromagnetic unit
component of a capacitor voltage transformer, connected between the intermediate voltage
terminal and the earth terminal of the capacitor divider (or possibly directly connected to earth
when a carrier-frequency coupling device is used) which supplies the secondary voltage
NOTE 501 An electromagnetic unit typically comprises a transformer to reduce the intermediate voltage to the
required value of secondary voltage, and a compensating inductance. The reactance L·(2πf ) of the compensating
R
inductance must be approximately equal at rated frequency f to the capacitive reactance
R
1/[2πf ·(C +C )] of the two parts of the divider connected in parallel. The compensating inductance may be
R 1 2
incorporated wholly or partially in the transformer.
3.1.536
intermediate transformer
voltage transformer in which the secondary voltage, in normal conditions of use, is
substantially proportional to the primary voltage
3.1.537
compensating inductance
L
inductance which is usually connected between the intermediate terminal and the high voltage
terminal of the primary winding of the intermediate transformer or between earth terminal and
the earth-side terminal of the primary winding of the intermediate transformer or incorporated
in the primary and secondary windings of the intermediate transformer
NOTE 501 The design value L of the inductance is: L=
(C +C )×(2π f )
1 2 R
3.1.538
damping device
device incorporated in the electromagnetic unit for the purposes of:
a) limiting overvoltages which may appear across one or more components;
b) and/or to prevent sustained ferro-resonance;
c) and or to achieve a higher performance of the transient response of the capacitor voltage
transformer
3.1.539
carrier-frequency accessories
circuit element intended to permit the injection of carrier frequency signal and which is
connected between the low voltage terminal of a capacitor divider unit and earth, having an
impedance which is insignificant at power frequency, but appreciable at the carrier frequency
(see Figure 5A.2)
3.1.540
drain coil
inductance which is connected between the low voltage terminal of a capacitor divider and
earth, and whose impedance is insignificant at power frequency, but has a high value at the
carrier frequency
3.1.541
voltage limitation element
element connected across the drain coil or between low voltage terminal of the capacitor
voltage divider and earth to limit the transient overvoltages which may appear across the
drain coil
– 14 – 61869-5 IEC:2011
NOTE 501 Examples of possible overvoltage causes are:
a) short circuit between the high-voltage terminal and earth;
b) in the case where an impulse voltage is applied between the high voltage terminal and earth;
c) line disconnectors operation.
3.1.542
carrier earthing switch
switch for earthing, when necessary, of the low voltage terminal
3.2 Definitions related to dielectric ratings and voltages
3.2.501
rated primary voltage
U
Pr
value of the primary voltage which appears in the designation of the voltage transformer and
on which its performance is based
[IEC 60050-321:1986, C321-01-12]
3.2.502
rated secondary voltage
U
Sr
value of the secondary voltage which appears in the designation of the voltage transformer
and on which its performance is based
[IEC 60050-321:1986, C 321-01-16]
3.2.503
rated voltage factor
F
V
multiplying factor to be applied to the rated primary voltage U to determine the maximum
Pr
voltage at which a transformer must comply with the relevant thermal requirements for a
specified time and with the relevant accuracy requirements
[IEC 60050-321:1986, C 321-03-12]
3.4 Definitions related to accuracy
3.4.3
ratio error
ε
subclause 3.4.3 o
...
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