Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1 000 V - Part 1: General - Performance, testing and rating - Safety requirements - Guide for installation and operation

IEC 60831-1:2014 is available as IEC 60831-1:2014 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60831-1:2014 is applicable to both capacitor units and capacitor banks intended to be used, particularly, for power-factor correction of a.c. power systems having a rated voltage up to and including 1 000 V and frequencies of 15 Hz to 60 Hz. This part of IEC 60831 also applies to capacitors intended for use in power filter circuits. Additional definitions, requirements, and tests for power filter capacitors are given in Annex A. The object of this part of IEC 60831 is to:
- formulate uniform rules regarding performances, testing and rating;
- formulate specific safety rules;
- provide a guide for installation and operation. This third edition cancels and replaces the second edition published in 1996 and Amendment 1:2002. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Updating of the normative references;
- Test conditions have been clarified;
- Thermal stability test has been clarified;
- Maximum permissible voltage and current have been clarified;
- The protection of the environment has been amended with safety concerns and plastic quality requirements.
The contents of the corrigendum of May 2014 have been included in this copy.

Condensateurs shunt de puissance autoregénérateurs pour réseaux à courant alternatif de tension assignée inférieure ou égale à 1 000 V - Partie 1: Généralités - Caractéristiques fonctionnelles, essais et valeurs assignées - Règles de sécurité - Guide d'installation et d'exploitation

IEC 60831-1:2014 est disponible sous forme de IEC 60831-1:2014 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
IEC 60831-1:2014 s'applique aux condensateurs unitaires et aux batteries de condensateurs autorégénérateurs destinés plus particulièrement à la correction du facteur de puissance des réseaux à courant alternatif de tension assignée inférieure ou égale à 1 000 V et de fréquence comprise entre 15 Hz et 60 Hz. Cette partie de la CEI 60831 s'applique également aux condensateurs destinés à être utilisés dans des circuits de filtrage. Les définitions, les exigences et les essais complémentaires pour les condensateurs de filtrage en courants forts sont indiqués dans l'Annexe A. La présente partie de la CEI 60831 a pour objet:
- de formuler des règles uniformes pour les performances, les essais et les caractéristiques assignées;
- de formuler des règles spécifiques de sécurité;
- de fournir un guide pour l'installation et l'utilisation. Cette troisième édition annule et remplace la seconde édition parue en 1996 et l'Amendement 1:2002. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour des références normatives;
- clarification des conditions d'essai;
- clarification de l'essai de stabilité thermique;
- clarification de la tension maximale et du courant maximal autorisés;
- modification des mesures de sécurité et des exigences en matière de qualité du plastique pour la protection de l'environnement. Mots clés: condensateurs unitaires et aux batteries de condensateurs autorégénérateurs, règles uniformes pour les performances, essais et les caractéristiques assignées règles spécifiques de sécurité; guide pour l'installation et l'utilisation. Le contenu du corrigendum de mai 2014 a été pris en considération dans cet exemple.

General Information

Status
Published
Publication Date
10-Feb-2014
Current Stage
PPUB - Publication issued
Start Date
11-Feb-2014
Completion Date
11-Feb-2014
Ref Project

Buy Standard

Standard
IEC 60831-1:2014 - Shunt power capacitors of the self-healing type for a.c. systems having a rated voltage up to and including 1 000 V - Part 1: General - Performance, testing and rating - Safety requirements - Guide for installation and operation
English and French language
73 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 60831-1
Edition 3.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Shunt power capacitors of the self-healing type for a.c. systems having a rated
voltage up to and including 1 000 V –
Part 1: General – Performance, testing and rating – Safety requirements – Guide
for installation and operation
Condensateurs shunt de puissance autoregénérateurs pour réseaux à courant
alternatif de tension assignée inférieure ou égale à 1 000 V –
Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs
assignées – Règles de sécurité – Guide d'installation et d'exploitation
IEC 60831-1:2014-02(EN-FR)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2014 IEC, Geneva, Switzerland

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

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

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org

The stand-alone application for consulting the entire The world's leading online dictionary of electronic and

bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and

Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 14

documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International

iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary

The advanced search enables to find IEC publications by a More than 55 000 electrotechnical terminology entries in

variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions

committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries

and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc

details all new publications released. Available online and If you wish to give us your feedback on this publication or

also once a month by email. need further assistance, please contact the Customer Service

Centre: csc@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
14 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 55 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC

en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et

comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus

projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just

Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette

Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:

csc@iec.ch.
---------------------- Page: 2 ----------------------
IEC 60831-1
Edition 3.0 2014-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Shunt power capacitors of the self-healing type for a.c. systems having a rated
voltage up to and including 1 000 V –
Part 1: General – Performance, testing and rating – Safety requirements – Guide
for installation and operation
Condensateurs shunt de puissance autoregénérateurs pour réseaux à courant
alternatif de tension assignée inférieure ou égale à 1 000 V –
Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs
assignées – Règles de sécurité – Guide d'installation et d'exploitation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.120.99; 31.060.70 ISBN 978-2-8322-1391-9

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

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

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60831-1 © IEC:2014
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 8

3 Terms and definitions ...................................................................................................... 8

4 Service conditions ......................................................................................................... 11

4.1 Normal service conditions ................................................................................ 11

4.2 Unusual service conditions .............................................................................. 12

5 Test requirements.......................................................................................................... 12

5.1 General ............................................................................................................ 12

5.2 Test conditions ................................................................................................ 13

6 Classification of tests .................................................................................................... 13

6.1 Routine tests.................................................................................................... 13

6.2 Type tests ........................................................................................................ 13

6.3 Acceptance tests ............................................................................................. 14

7 Capacitance measurement and output calculation ......................................................... 14

7.1 Measuring procedure ....................................................................................... 14

7.2 Capacitance tolerances .................................................................................... 14

8 Measurement of the tangent of the loss angle (tan δ) of the capacitor ............................ 15

8.1 Measuring procedure ....................................................................................... 15

8.2 Loss requirements ........................................................................................... 15

9 Voltage tests between terminals .................................................................................... 15

9.1 Routine test ..................................................................................................... 15

9.2 Type test .......................................................................................................... 15

10 Voltage tests between terminals and container .............................................................. 16

10.1 Routine test ..................................................................................................... 16

10.2 Type test .......................................................................................................... 16

11 Test of internal discharge device ................................................................................... 17

12 Sealing test ................................................................................................................... 17

13 Thermal stability test ..................................................................................................... 17

14 Measurement of the tangent of the loss angle (tan δ) of the capacitor at elevated

temperature ................................................................................................................... 19

14.1 Measuring procedure ....................................................................................... 19

14.2 Requirements .................................................................................................. 19

15 Lightning impulse voltage test between terminals and container .................................... 19

16 Discharge test ............................................................................................................... 19

17 Ageing test .................................................................................................................... 20

18 Self-healing test ............................................................................................................ 20

19 Destruction test ............................................................................................................. 20

20 Maximum permissible voltage ........................................................................................ 20

20.1 Long-duration voltages .................................................................................... 20

20.2 Switching voltages ........................................................................................... 21

21 Maximum permissible current ........................................................................................ 21

22 Discharge device ........................................................................................................... 21

23 Container connections ................................................................................................... 22

---------------------- Page: 4 ----------------------
60831-1 © IEC:2014 – 3 –

24 Protection of the environment ........................................................................................ 22

25 Other safety requirements ............................................................................................. 22

26 Marking of the unit ......................................................................................................... 22

26.1 Rating plate ..................................................................................................... 22

26.2 Standardized connection symbols .................................................................... 23

26.3 Warning plate .................................................................................................. 23

27 Marking of the bank ....................................................................................................... 23

27.1 Instruction sheet or rating plate ........................................................................ 23

27.2 Warning plate .................................................................................................. 23

28 General ......................................................................................................................... 24

29 Choice of the rated voltage ............................................................................................ 24

30 Operating temperature ................................................................................................... 25

30.1 General ............................................................................................................ 25

30.2 Installation ....................................................................................................... 25

30.3 High ambient air temperature ........................................................................... 25

30.4 Evaluation of losses ......................................................................................... 25

31 Special service conditions ............................................................................................. 26

32 Overvoltages ................................................................................................................. 26

33 Overload currents .......................................................................................................... 27

34 Switching and protective devices and connections ......................................................... 27

35 Choice of creepage distance ......................................................................................... 28

36 Capacitors connected to systems with audio-frequency remote control .......................... 29

37 Electromagnetic compatibility (EMC) ............................................................................. 29

37.1 Emission .......................................................................................................... 29

37.2 Immunity .......................................................................................................... 29

37.2.1 General .......................................................................................... 29

37.2.2 Low-frequency disturbances ........................................................... 29

37.2.3 Conducted transients and high-frequency disturbances .................. 29

37.2.4 Electrostatic discharges .................................................................. 29

37.2.5 Magnetic disturbances .................................................................... 30

37.2.6 Electromagnetic disturbances ......................................................... 30

Annex A (normative) Additional definitions, requirements and tests for power filter

capacitors ............................................................................................................................. 31

A.1 Terms and definitions ....................................................................................... 31

A.2 Quality requirements and tests ......................................................................... 31

A.2.1 Capacitance tolerance .................................................................... 31

A.2.2 Voltage test between terminals (see Clause 9) ............................... 32

A.2.3 Thermal stability test (see Clause 13) ............................................. 32

A.3 Overloads – Maximum permissible current (see Clause 21) ............................. 32

A.4 Markings – Instruction sheet or rating plate (see 27.1) ..................................... 32

A.5 Guide for installation and operation – Choice of the rated voltage (see

Clause 29) ....................................................................................................... 32

Annex B (informative) Formulae for capacitors and installations .......................................... 33

B.1 Computation of the output of three-phase capacitors from three single-

phase capacitance measurements ................................................................... 33

B.2 Resonance frequency ...................................................................................... 33

B.3 Voltage rise ..................................................................................................... 33

---------------------- Page: 5 ----------------------
– 4 – 60831-1 © IEC:2014

B.4 Inrush transient current .................................................................................... 34

B.4.1 Switching in of single capacitor ....................................................... 34

B.4.2 Switching of capacitors in parallel with energized capacitor(s) ........ 34

B.4.3 Discharge resistance in single-phase units or in one-phase or

polyphase units .............................................................................. 34

Bibliography .......................................................................................................................... 36

Figure B.1 – k values depending on the method of connection of the resistors with the

capacitor units ...................................................................................................................... 35

Table 1 – Letter symbols for upper limit of temperature range ............................................... 12

Table 2 – Ambient air temperature for the thermal stability test ............................................. 18

Table 3 – Admissible voltage levels in service ...................................................................... 20

---------------------- Page: 6 ----------------------
60831-1 © IEC:2014 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SHUNT POWER CAPACITORS OF THE SELF-HEALING TYPE FOR A.C.
SYSTEMS HAVING A RATED VOLTAGE UP TO AND INCLUDING 1 000 V –
Part 1: General – Performance, testing and rating –
Safety requirements – Guide for installation and operation
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60831-1 has been prepared by IEC technical committee 33: Power

capacitors and their applications.

This third edition cancels and replaces the second edition published in 1996 and Amendment

1:2002. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) Updating of the normative references;
b) Test conditions have been clarified;
c) Thermal stability test has been clarified;
d) Maximum permissible voltage and current have been clarified;
---------------------- Page: 7 ----------------------
– 6 – 60831-1 © IEC:2014

e) The protection of the environment has been amended with safety concerns and plastic

quality requirements.
The text of this standard is based on the following documents:
FDIS Report on voting
33/543/FDIS 33/550/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.

A list of all parts in the IEC 60831 series, published under the general title Shunt power

capacitors of the self-healing type for a.c. systems having a rated voltage up to and including,

1 000 V can be found on the IEC website.

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.
The contents of the corrigendum of May 2014 have been included in this copy.
---------------------- Page: 8 ----------------------
60831-1 © IEC:2014 – 7 –
SHUNT POWER CAPACITORS OF THE SELF-HEALING TYPE FOR A.C.
SYSTEMS HAVING A RATED VOLTAGE UP TO AND INCLUDING 1 000 V –
Part 1: General – Performance, testing and rating –
Safety requirements – Guide for installation and operation
1 Scope

This part of the IEC 60831 series is applicable to both capacitor units and capacitor banks

intended to be used, particularly, for power-factor correction of a.c. power systems having a

rated voltage up to and including 1 000 V and frequencies of 15 Hz to 60 Hz.

This part of IEC 60831 also applies to capacitors intended for use in power filter circuits.

Additional definitions, requirements, and tests for power filter capacitors are given in Annex A.

The following capacitors are excluded from this part of IEC 60831:

– Shunt power capacitors of the non-self-healing type for a.c. systems having a rated

voltage up to and including 1 000 V (IEC 60931-, -2 and -3).
– Shunt capacitors for a.c. power systems having a rated voltage above 1 000 V
(IEC 60871-1, -2, -3 and -4).

– Capacitors for inductive heat-generating plants operating at frequencies between 40 Hz

and 24 000 Hz (IEC 60110-1 and -2)
– Series capacitors (IEC60143-1, -2, -3 and -4)
– AC motor capacitors (IEC 60252-1 and -2)
– Coupling capacitors and capacitor dividers (IEC 60358-1)
– Capacitors for power electronic circuits (IEC 61071).

– Small a.c. capacitors to be used for fluorescent and discharge lamps (IEC 61048 and

IEC 61049).
– Capacitors for suppression of radio interference (under consideration).

– Capacitors intended to be used in various types of electrical equipment, and thus

considered as components.

– Capacitors intended for use with d.c. voltage superimposed on the a.c. voltage.

Accessories such as insulators, switches, instrument transformers, fuses, etc., should be in

accordance with the relevant IEC standards and are not covered by the scope of this part of

IEC 60831.
The object of this part of IEC 60831 is to:
a) formulate uniform rules regarding performances, testing and rating;
b) formulate specific safety rules;
c) provide a guide for installation and operation.
---------------------- Page: 9 ----------------------
– 8 – 60831-1 © IEC:2014
2 Normative references

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.

IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements
IEC 60269-1:2006, Low-voltage fuses – Part 1: General requirements

IEC 60831-2:2013, Shunt power capacitors of the self-healing type for a.c. systems having a

rated voltage up to and including 1 000 V – Part 2: Ageing test, self-healing test and

destruction test

IEC 60695-2-12:2010, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –

Glow-wire flammability index (GWFI) test method for materials

IEC 61000-2-2:2002, Electromagnetic compatibility (EMC) – Part 2-2: Environment –

Compatibility levels for low-frequency conducted disturbances and signalling in public low-

voltage power supply systems
IEC 61000-4-1:2006, Electromagnetic compatibility (EMC) – Part 4-1: Testing and
measurement techniques – Overview of IEC 61000-4 series
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
capacitor element
element
device consisting essentially of two electrodes separated by a dielectric
[SOURCE: IEC 60050-436:1990, 436-01-03]
3.2
capacitor unit
unit

assembly of one or more capacitor elements in the same container with terminals brought out

[SOURCE: IEC 60050-436:1990, 436-01-04]
3.3
self-healing capacitor

capacitor of which the electrical properties, after local breakdown of the dielectric, are rapidly

and essentially restored
[SOURCE: IEC 60050-436:1990, 436-03-12]
3.4
capacitor bank
bank
number of capacitor units connected so as to act together
---------------------- Page: 10 ----------------------
60831-1 © IEC:2014 – 9 –
[SOURCE: IEC 60050-436:1990, 436-01-06]
3.5
capacitor
generic term, encompassing the notions of capacitor unit and capacitor bank

Note 1 to entry: In this part of IEC 60831, the word capacitor is used when it is not necessary to lay particular

stress upon the different meanings of the words capacitor unit or capacitor bank.

3.6
capacitor installation
one or more capacitor banks and their accessories
[SOURCE: IEC 60050-436:1990, 436-01-07]
3.7
discharge device of a capacitor

device which may be incorporated in a capacitor, capable of reducing the voltage between the

terminals practically to zero, within a given time, after the capacitor has been disconnected

from a network
[SOURCE: IEC 60050-436:199
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.