IEC 62146-2:2023

Capacitors for high‑voltage alternating current circuit‑breakers - Part 2: TRV capacitors

IEC 62146-2:2023 is applicable to TRV capacitors used on high-voltage alternating current circuit-breakers with rated voltages above 100 kV with 50 Hz or 60 Hz.
TRV capacitors are installed phase to earth, either in parallel to the bushing on dead tank circuit-breakers, or immersed inside the circuit-breaker, or freestanding close to the circuit-breaker. Their function is to limit the transient recovery voltage (TRV) and the rate of rise of recovery voltage (RRRV) on the circuit-breaker. Capacitors in compliance with this document can be used as TRV capacitor.
This document applies to TRV capacitors falling into one or both of the following categories for:
- mounting on or close to air insulated switchgear (AIS) dead tank and live tank circuit-breakers, or
- mounting on gas insulated switchgear (GIS) circuit-breakers.
The testing for each of the above applications is in some cases different.
This document does not apply to grading capacitors installed in parallel to the chambers of the circuit-breaker, which are specified in IEC 62146-1.
This document does not apply to capacitors not directly associated with high-voltage alternating current circuit-breakers.
The object of this document is:
- to define uniform rules regarding performances, testing and rating
- to define specific safety rules
- to provide a guidance for installation and operation
The TRV capacitor is a sub-component for the circuit-breaker and is specified in accordance with the circuit-breaker specifications according to IEC 62271-1, IEC 62271-100, and if applicable to IEC 62271-203.
TRV capacitors are commonly built with composite or ceramic housings (insulators). Those insulators follow IEC 61462 or IEC 62155. Other housings can be used if they can sustain applicable type tests according to IEC 61462 and IEC 62155.
This International Standard is to be used in conjunction with IEC 62146-1:2013 and IEC 62146-1:2013/AMD1:2016.

Condensateurs pour disjoncteurs à courant alternatif haute tension - Partie 2: Condensateurs TTR

IEC 62146-2:2023 s’applique aux condensateurs TTR utilisés sur les disjoncteurs à courant alternatif haute tension dont les tensions assignées sont supérieures à 100 kV à 50 Hz ou 60 Hz.
Les condensateurs TTR à neutre reliés à la terre sont installés soit parallèlement à la traversée sur les disjoncteurs à cuve mise à la terre, soit immergés à l’intérieur du disjoncteur, soit de façon autonome à proximité du disjoncteur. Leur fonction est de limiter la tension transitoire de rétablissement (TTR) et la vitesse d’accroissement de la tension de rétablissement (VATR) sur le disjoncteur. Les condensateurs conformes au présent document peuvent être utilisés comme condensateur TTR.
Le présent document s’applique aux condensateurs TTR relevant de l’une ou l’autre des catégories suivantes pour:
– montage sur ou à proximité de disjoncteurs à cuve mise à la terre ou à cuve sous tension des appareillages isolés dans l’air (AIS); ou
– montage sur des disjoncteurs à isolation gazeuse (GIS).
Les essais pour chacune des applications ci-dessus sont, dans certains cas, différents.
Le présent document ne s’applique pas aux condensateurs installés en parallèle aux chambres du disjoncteur, qui sont spécifiés dans l’IEC 62146-1.
Le présent document ne s’applique pas aux condensateurs qui ne sont pas directement associés aux disjoncteurs à courant alternatif haute tension.
Le présent document a pour objet de:
– définir des règles uniformes concernant les performances, les essais et les caractéristiques assignées;
– définir des règles de sécurité spécifiques;
– fournir des recommandations pour l’installation et le fonctionnement.
Le condensateur TTR est un sous-composant du disjoncteur et il est spécifié conformément aux spécifications des disjoncteurs de l’IEC 62271-1, de l’IEC 62271-100 et, le cas échéant, de l’IEC 62271-203.
Les condensateurs TTR sont généralement construits avec des boîtiers composites ou céramiques (isolateurs). Ces isolateurs sont conformes à l’IEC 61462 ou l’IEC 62155. D’autres boîtiers peuvent être utilisés s’ils peuvent supporter les essais de type applicables conformément à l’IEC 61462 et à l’IEC 62155.
This International Standard is to be used in conjunction with IEC 62146-1:2013 and IEC 62146-1:2013/AMD1:2016.

General Information

• Status: Published
• Publication Date: 09-Jan-2023
• ICS: 31.060 - Capacitors
• ICS: 31.060.70 - Power capacitors
• Technical Committee: TC 33 - Power capacitors and their applications
• Drafting Committee: JMT 17A - TC 33/JMT 17A
• Current Stage: PPUB - Publication issued
• Start Date: 27-Jan-2023
• Completion Date: 10-Jan-2023

Standards Content (Sample)

IEC 62146-2
®

Edition 1.0 2023-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Capacitors for high‑voltage alternating current circuit‑breakers –
Part 2: TRV capacitors

Condensateurs pour disjoncteurs à courant alternatif haute tension –
Partie 2: Condensateurs TTR

IEC 62146-2:2023-01(en-fr)

---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62146-2

®


Edition 1.0 2023-01




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE











Capacitors for high‑voltage alternating current circuit‑breakers –

Part 2: TRV capacitors



Condensateurs pour disjoncteurs à courant alternatif haute tension –

Partie 2: Condensateurs TTR
















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 31.060; 31.060.70 ISBN 978-2-8322-6353-2




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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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– 2 – IEC 62146-2:2023 © IEC 2023
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Abbreviated terms . 8
5 Service conditions . 8
6 Ratings . 9
6.1 Rated voltage (U ) . 9
cr
6.2 Rated insulation level . 9
6.3 Rated frequency (f ) . 11
r
7 Design and construction . 11
7.1 Capacitance tolerances . 11
7.2 Capacitor loss requirements . 11
7.3 Partial discharge level . 11
7.4 Angle of mounting . 11
7.5 Minimum withstand value of mechanical bending load . 11
7.5.1 Capacitors mounted on air insulated circuit-breaker . 11
7.5.2 Immersed capacitors . 12
7.5.3 Freestanding capacitors . 12
7.6 Requirements for impregnation medium in capacitor . 12
7.7 Protection against corrosion . 12
7.8 Marking of the equipment . 12
7.9 Creepage distances for outdoor insulators . 13
7.10 Tightness . 13
8 Type tests . 13
8.1 Information for identification of specimens . 13
8.2 Information to be included in type-test reports . 13
8.3 Test conditions . 13
8.4 Electrical type tests . 13
8.4.1 General . 13
8.4.2 Switching impulse voltage test . 14
8.4.3 Lightning and chopped impulse voltage test . 14
8.5 Voltage test at low and high temperature . 15
8.5.1 Test procedure . 15
8.5.2 Capacitor reduced-scale model design . 15
8.6 Radio Interference Voltage (RIV) test . 15
8.7 Short-circuit discharge test . 16
8.8 Resonance frequency measurements. 16
8.9 Mechanical bending test . 16
8.10 Tightness test at different temperatures . 16
8.11 Tightness test to check gas ingress from pressurized environment . 16
8.12 Vibration test . 16
9 Routine tests . 17
9.1 General . 17
9.2 Test conditions . 17
9.3 Capacitance and loss angle measurements at power frequency . 17

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IEC 62146-2:2023 © IEC 2023 – 3 –
9.4 Power frequency voltage test . 17
9.5 Partial discharge test . 18
9.6 Tightness test . 18
9.6.1 General . 18
9.6.2 Oil impregnated capacitor . 18
9.6.3 Tightness test for gas filled capacitors . 18
9.7 Visual inspection and dimensional check . 18
10 Recommendations for transport, storage, erection, operation, and maintenance . 19
11 Safety . 19
11.1 General . 19
11.2 Precautions by manufacturers . 19
11.3 Precautions by users . 19
11.4 National regulations . 19
12 Environmental aspects . 20


Figure 1 – Electrical type tests sequence . 14
Figure 2 – Reduced scale model capacitor element geometry . 15
Figure 3 – Electrical routine test sequence . 17


Table 1 – Standard insulation levels – Range I (U < 300 kV). 9
r
Table 2 – Standard insulation levels – Range II (U ≥ 300 kV) . 10
r
Table 3 – Partial discharge test voltages and permissible levels . 11

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– 4 – IEC 62146-2:2023 © IEC 2023
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

CAPACITORS FOR HIGH‑VOLTAGE ALTERNATING
CURRENT CIRCUIT‑BREAKERS –

Part 2: TRV capacitors

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
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62146-2 has been prepared by IEC technical committee 33: Power capacitors and their
applications. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
33/685/FDIS 33/686/RVD

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.

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IEC 62146-2:2023 © IEC 2023 – 5 –
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This International Standard is to be used in conjunction with IEC 62146-1:2013 and
IEC 62146-1:2013/AMD1:2016.
A list of all parts in the IEC 62146 series, published under the general title Capacitors for
high-voltage alternating current circuit-breakers, can be found on the IEC website. The title of
the series was changed in 2022 by decision of TC 33, and the title of IEC 62146-1 will be
modified accordingly in its next edition.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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– 6 – IEC 62146-2:2023 © IEC 2023
CAPACITORS FOR HIGH‑VOLTAGE ALTERNATING
CURRENT CIRCUIT‑BREAKERS –

Part 2: TRV capacitors



1 Scope
This part of IEC 62146 is applicable to TRV capacitors used on high-voltage alternating current
circuit-breakers with rated voltages above 100 kV with 50 Hz or 60 Hz.
TRV capacitors are installed phase to earth, either in parallel to the bushing on dead tank
circuit-breakers, or immersed inside the circuit-breaker, or freestanding close to the circuit-
breaker. Their function is to limit the transient recovery voltage (TRV) and the rate of rise of
recovery voltage (RRRV) on the circuit-breaker. Capacitors in compliance with this document
can be used as TRV capacitor.
This document applies to TRV capacitors falling into one or both of the following categories for:
– mounting on or close to air insulated switchgear (AIS) dead tank and live tank circuit-
breakers, or
– mounting on gas insulated switchgear (GIS) circuit-breakers.
The testing for each of the above applications is in some cases different.
This document does not apply to grading capacitors installed in parallel to the chambers of the
circuit-breaker, which are specified in IEC 62146-1.
This document does not apply to capacitors not directly associated with high-voltage alternating
current circuit-breakers.
The object of this document is:
– to define uniform rules regarding performances, testing and rating
– to define specific safety rules
– to provide a guidance for installation and operation
The TRV capacitor is a sub-component for the circuit-breaker and is specified in accordance
with the circuit-breaker specifications according to IEC 62271-1, IEC 62271-100, and if
applicable to IEC 62271-203.
TRV capacitors are commonly built with composite or ceramic housings (insulators). Those
insulators follow IEC 61462 or IEC 62155. Other housings can be used if they can sustain
applicable type tests according to IEC 61462 and IEC 62155.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements

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IEC 62146-2:2023 © IEC 2023 – 7 –
IEC 60358-1:2012, Coupling capacitors and capacitor dividers – Part 1: General rules
IEC 60815 (all parts), Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions
IEC 60871-1:2014, Shunt capacitors for a.c. power systems having a rated voltage above
1 000 V – Part 1: General
IEC 61462:2007, Composite hollow insulators – Pressurized and unpressurized insulators for
use in electrical equipment with rated voltage greater than 1 000 V – Definitions, test methods,
acceptance criteria and design recommendations
IEC 62146-1:2013, Grading capacitors for high-voltage alternating current circuit-breakers –
Part 1: General
IEC 62146-1:2013/AMD1:2016
IEC 62155:2003, Hollow pressurized and unpressurized ceramic and glass insulators for use in
electrical equipment with rated voltages greater than 1 000 V
IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications
for alternating current switchgear and controlgear
IEC 62271-1:2017/AMD1:2021
IEC 62271-100:2021, High-voltage switchgear and controlgear – Part 100: Alternating-current
circuit-breakers
IEC 62271-203, High-voltage switchgear and controlgear – Part 203: AC gas-insulated metal-
enclosed switchgear for rated voltages above 52 kV
IEC GUIDE 109, Environmental aspects – Inclusion in electrotechnical product standards
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62146-1:2013 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
capacitor
two-terminal device characterized essentially by its capacitance
[SOURCE: IEC 60050-151:2001, 151-13-28]
3.2
TRV capacitor
capacitor for installation on high-voltage circuit-breakers phase to earth, either on circuit-
breaker bushings or freestanding close to the circuit-breaker to limit TRV or RRRV
Note 1 to entry: The TRV capacitors alone are accessories of the circuit-breaker.

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– 8 – IEC 62146-2:2023 © IEC 2023
3.3
freestanding capacitor
TRV capacitor installed as an accessory to the circuit-breaker and mounted in its proximity
Note 1 to entry: The freestading capacitor does not need to be fixed at the same supporting structure of the circuit-
breaker.
Note 2 to entry: Freestanding capacitors are sometimes named standalone TRV capacitors.
3.4
ambient temperature
temperature of the insulating fluid surrounding the capacitor at its surface
3.5
transient recovery voltage
TRV
recovery voltage during the time in which it has a significant transient character
Note 1 to entry: The transient recovery voltage may be oscillatory or non-oscillatory or a combination of these
depending on the characteristics of the circuit and the switching device. It includes the voltage shift of the neutral of
a polyphase circuit.
Note 2 to entry: The transient recovery voltages in three-phase circuits are, unless otherwise stated, that across
the first pole to clear, because this voltage is generally higher than that which appears across each of the other two
poles.
[SOURCE: IEC 60050-441:1984, 441-17-26]
3.6
rate of rise of recovery voltage
RRRV
first peak transient recovery voltage divided by the total time from zero voltage to peak voltage
Note 1 to entry: Levels of TRV and the RRRV are key factors in determining whether the fault can be cleared
successfully.
3.7
voltage factor
F
V
factor used when the TRV capacitor is composed of several capacitors connected in series
phase to earth
Note 1 to entry: F will affect the insulating voltage levels of the individual capacitors to add some safety margin.
v
4 Abbreviated terms
Clause 4 of IEC 62146-1:2013 is applicable with the following additions.
F voltage factor
v
TRV transient recovery voltage
RRRV rate of rise of recovery voltage
5 Service conditions
For TRV capacitors installed on the circuit-breaker or immersed capacitors, the service
conditions are given in IEC 62146-1:2013, Clause 5.
For freestanding capacitors, the service conditions are given in IEC 60358-1:2012, Clause 4.

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IEC 62146-2:2023 © IEC 2023 – 9 –
6 Ratings
6.1 Rated voltage (U )
cr
The rated voltage U of a TRV capacitor connected between one phase of a three-phase
cr
system and earth shall be equal or greater than the value of the rated voltage U of the circuit-
r
breaker divided by √3.
Preferred values for U are given in IEC 62271-1.
r
NOTE U used in IEC 62271 series and in this standard corresponds to U presented in IEC 60071-1.
r m
6.2 Rated insulation level
The choice of the insulation level for equipment shall be made in accordance with the standard
insulation levels, based on its highest voltage for equipment U . Guidance for the choice of the
r
insulation level is given below.
In case of TRV capacitor of an air insulated circuit-breaker installed parallel to the bushing, the
insulation levels are according to IEC 62271-1.
In case of TRV capacitor installed in a gas insulated switchgear (GIS and dead tank breaker),
the insulation levels are according to IEC 62271-203.
In case of TRV capacitor installed freestanding, the insulation levels are according to Table 1
and Table 2 (adapted from IEC 60358-1). The rated insulation levels shall be based on the rated
voltage of the circuit-breaker U .
r
Table 1 – Standard insulation levels – Range I (U < 300 kV)
r
Rated voltage of Rated power- Rated lightning Rated switching
the circuit- frequency withstand impulse withstands withstand voltage
breaker (U ) voltage voltage
r
Range
(RMS) (RMS) (peak) (peak)
kV kV kV kV
100 185 450
185 450
123
230 550
230 550
145
I 275 650
275 650
170
325 750
395 950
245
460 1 050
NOTE 1 For exposed installations it is recommended to choose the highest insulation level.
NOTE 2 For alternative levels, see IEC 60071-1.

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– 10 – IEC 62146-2:2023 © IEC 2023
Table 2 – Standard insulation levels – Range II (U ≥ 300 kV)
r
Rated voltage of Rated power- Rated lightning Rated switching
the circuit- frequency withstand impulse withstands withstand voltage
breaker (U ) voltage voltage
r
Range
(RMS) (RMS) (peak) (peak)
kV kV kV kV
850
395 750
950
300
950
460 850
1 050
950
460 850
1 050
362
1 050
510 950
1 175
1 050
850
1 175
570
1 175
420 950
1 300
1 300
630 1 050
1 425
1 175
950
1 300
630
1 300
550 1 050
1 425
1 425
680 1 175
1 550
II
1 675
1 300
1 800
880
1 800
800 1 425
1 950
1 950
975 1 550
2 100
1 950
1 425
2 100
2 100
1 550
2 250
1 100
2 250
1 675
2 400
2 400
1 800
2 550
2 100
1 675
2 250
2 250
1 800
1 200
2 400
2 550
1 950
2 700
NOTE 1 For exposed installations it is recommended to choose the highest insulation level.
NOTE 2 For alternative levels, see IEC 60071-1.

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IEC 62146-2:2023 © IEC 2023 – 11 –
6.3 Rated frequency (f )
r
The standard considered values for the rated frequency are 50 Hz or 60 Hz.
7 Design and construction
7.1 Capacitance tolerances
The measured capacitance shall not differ from the rated capacitance (C ) by more than ±5 %
r
for all type of TRV capacitors unless otherwise agreed between manufacturer and user.
7.2 Capacitor loss requirements
Subclause 7.2 of IEC 62146-1:2013 is applicable.
7.3 Partial discharge level
The partial discharge level shall not exceed the limits specified in Table 3 at the partial
discharge test voltage specified in the same table according to the procedures of clause 9.5.
Table 3 – Partial discharge test voltages and permissible levels
Permissible PD level (pC) Permissible PD level (pC)
PD test voltage (RMS)
Air insulated capacitors Immersed capacitors
1,2 𝑈𝑈 ≤ 10 ≤ 5
r
1,2 𝑈𝑈
r
≤ 5 ≤ 3

3
√
NOTE 1 The permissible PD level is also valid for frequ
...