EN 60931-1:1996

SLOVENSKI STANDARD
01-julij-1999
Shunt power capacitors of the non-self-healing type for a.c. systems having a
rated voltage up to and including 1 kV - Part 1: General - Performance, testing and
rating - Safety requirements - Guide for installation and operation (IEC 60931-
1:1996)
Shunt power capacitors of the non-self-healing type for a.c. systems having a rated
voltage up to and including 1 kV -- Part 1: General - Performance, testing and rating -
Safety requirements - Guide for installation and operation
Nichtselbstheilende Leistungs-Parallelkondensatoren für Wechselstromanlagen mit einer
Nennspannung bis 1 kV -- Teil 1: Allgemeines - Leistungsanforderungen, Prüfung und
Bemessung - Sicherheitsanforderungen - Anleitung für Errichtung und Betrieb
Condensateurs shunt de puissance non autorégénérateurs pour réseaux à courant
alternatif de tension assignée inférieure ou égale à 1 kV -- Partie 1: Généralités -
Caractéristiques fonctionnelles, essais et valeurs assignées - Règles de sécurité - Guide
d'installation et d'exploitation
Ta slovenski standard je istoveten z: EN 60931-1:1996
ICS:
31.060.70 0RþQRVWQLNRQGHQ]DWRUML Power capacitors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME CEI
INTERNATIONALE IEC
931-1
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1996-11
Condensateurs shunt de puissance non
autorégénérateurs 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
Shunt power capacitors of the non-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
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931-1 © IEC:1996
CONTENTS
Page
FOREWORD 7
SECTION 1: GENERAL
Clause
1 Scope and object 9
2 Normative references
3 Definitions
4 Service conditions
SECTION 2: QUALITY REQUIREMENTS AND TESTS
5 Test requirements 19
6 Classification of tests 21
7 Capacitance measurement and output calculation
8 Measurement of the tangent of the loss angle (tan 8) of the capacitor
9 Voltage tests between terminals
10 Voltage tests between terminals and container
11 Test of internal discharge device
12 Sealing test 29
13 Thermal stability test 29
14 Measurement of the tangent of the loss angle (tan 8) of the capacitor at elevated
temperature
15 Lightning impulse voltage test between terminals and container
16 Discharge test
17 Ageing test
18 Self-healing test
19 Destruction test
SECTION 3: OVERLOADS
20 Maximum permissible voltage
21 Maximum permissible current
SECTION 4: SAFETY REQUIREMENTS
22 Discharge device 39
23 Container connections
24 Protection of the environment
25 Other safety requirements
931-1 ©IEC:1996 – 5 –
Clause Page
SECTION 5: MARKINGS
26 Marking of the unit 41
27 Marking of the bank 43
SECTION 6: GUIDE FOR INSTALLATION AND OPERATION
28 General 43
29 Choice of the rated voltage
30 Operating temperature
31 Special service conditions
32 Overvoltages 49
33 Overload currents 51
34 Switching and protective devices and connections 53
35 Choice of creepage distance 55
36 Capacitors connected to systems with audio-frequency remote control 55
37 Electromagnetic compatibility (EMC) 57
Annexes
A Additional definitions, requirements and tests for power filter capacitors 61
B Formulae for capacitors and installations 65

931-1 © IEC:1996 — 7 —
INTERNATIONAL ELECTROTECHNICAL COMMISSION
SHUNT POWER CAPACITORS OF THE NON-SELF-HEALING TYPE
FOR AC SYSTEMS HAVING A
RATED VOLTAGE
UP TO AND INCLUDING 1000 V –
Part 1: General – Performance, testing and rating –
Safety requirements – Guide for installation and operation
FOREWORD
1)
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international cooperation on all questions concerning standardization in the electrical and
electronic fields. To this end and in addition to other activities, the IEC publishes International Standards.
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. The 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 the 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 National Committees.
3)
The documents produced have the form of recommendations for international use and are published in the
form of standards, technical reports or guides and they are accepted by the National Committees in that
sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6)
Attention is drawn to the possibility that some of the elements of this International Standard may be the
subject of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 931-1 has been prepared by IEC technical committee 33:
Power capacitors.
This second edition cancels and replaces the first edition published in 1989 and its
amendment 1 (1991), and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
33/235/FDIS
33/250/RVD
33/235A/FDIS
Full information on the voting for the approval of this standard can be found in the report
on voting indicated in the above table.
Annexe A forms an integral part of this standard.
Annex B is for information only.

931-1 © IEC:1996 - 9 -
SHUNT POWER CAPACITORS
OF THE NON-SELF-HEALING TYPE
FOR AC SYSTEMS HAVING A RATED VOLTAGE
UP TO AND INCLUDING 1000 V –
Part 1: General – Performance, testing and rating –
Safety requirements – Guide for installation and operation
Section 1: General
1 Scope and object
This part of IEC 931 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 1000 V and frequencies 15 Hz to 60 Hz.
This part of IEC 931 also applies to capacitors intended for use in power filter circuits.
Additional definitions, requirements, and tests for filter capacitors are given in annex A.
Additional requirements for capacitors protected by internal element fuses, as well as
requirements for the same, are given in IEC 931-3.
The following capacitors are excluded from this part of IEC 931:
-
Shunt power capacitors of the self-healing type for a.c. systems having a rated volt-
age up to and including 1000 V (IEC 831).
- Shunt capacitors for a.c. power systems having a rated voltage above 1000 V
(IEC 871).
- Capacitors for inductive heat-generating plants operating at frequencies between
40 Hz and 24 000 Hz (IEC 110).
Series capacitors (IEC 143).
- Capacitors for motor applications and the like (IEC 252).
- Coupling capacitors and capacitor dividers (IEC 358).
- Capacitors to be used in power electronic circuits (IEC 1071).
- Small a.c. capacitors to be used for fluorescent and discharge lamps (IEC 1048 and
IEC 1049).
- 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., are to be in
accordance with the relevant IEC standards.

- 11 -
931-1 ©IEC:1996
a) to formulate uniform rules regarding performances, testing and rating;
b) to formulate specific safety rules;
c) to provide a guide for installation and operation.
2 Normative references
The following normative documents contains provisions which, through reference in this
text, constitute provisions of this part of IEC 931. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this part of IEC 931 are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. Members
of IEC and ISO maintain registers of currently valid International Standards.
IEC 50(436): 1990, International Electrotechnical Vocabulary (lEV) - Chapter 436: Power
capacitors
IEC 60-1: 1989, High voltage test techniques - Part 1: General definitions and test
requirements
IEC 110: 1973, Recommendation for capacitors for inductive heat generating plants
operating at frequencies between 40 and 24 000 Hz
IEC 143: 1992, Series capacitors for power systems
A.C. motor capacitors
IEC 252: 1993,
IEC 269-1: 1986, Low-voltage fuses - Part 1: General requirements
IEC 358: 1990, Coupling capacitors and capacitor dividers
IEC 831-1: 1996, Shunt power capacitors of the self-healing type for a.c. systems having a
rated voltage up to and including 1000 V - Part 1: General - Performance, testing and
rating - Safety requirements - Guide for installation and operation
IEC 871-1: 1987, Shunt capacitors for a.c. power systems having a rated voltage above
1000 V* - Part 1: General - Performance, testing and rating - Safety requirements -
Guide for installation and operation
IEC 931-2: 1995, Shunt power capacitors of the non-self-healing type for a.c. systems
having a rated voltage up to and including 1000 V - Part 2: Ageing test and destruction
test
* According to Amendment No. 1 (1991).

931-1 ©IEC:1996 - 13 -
IEC 931-3: 1996, Shunt power capacitors of the non-self-healing type for a.c. systems
having a rated voltage up to and including 1000 V - Pa
rt 3: Internal fuses
IEC 1000-2-2: 1990, Electromagnetic compatibility (EMC) - Part 2: Environment -
Section 2: Compatibility levels for low-frequency conducted disturbances and signalling in
public low-voltage power supply systems
IEC 1000-4-1: 1992, Electromagnetic compatibility (EMC) - Part 4: Testing and measure-
ment techniques - Section 1: Overview of immunity tests - Basic EMC publication
IEC 1048: 1991, Capacitors for use in tubular fluorescent and other discharge lamp
circuits - General and safety requirements
IEC 1049: 1991, Capacitors for use in tubular fluorescent and other discharge lamp
circuits - Performance requirements
IEC 1071-1: 1993, Power electronic capacitors - Part 1: General
3 Definitions
For the purpose of this part of IEC 931, the following definitions apply:
3 1 capacitor element (or element): A device consisting essentially of two electrodes
separated by a dielectric. [IEV 436-01-03]
3.2 capacitor unit (or unit): An assembly of one or more capacitor elements in the
same container with terminals brought out. [IEV 436-01-04]
3.3 non-self-healing capacitor: A capacitor in which the dielectric, after local break-
down, is not restored.
3.4 capacitor bank (or bank): A number of capacitor units connected so as to act
together. [IEV 436-01-06]
3.5 capacitor: In this part of IEC 931, the word capacitor is used when it is not neces-
sary to lay particular stress upon the different meanings of the words capacitor unit or
capacitor bank.
One or more capacitor banks and their accessories.
3.6 capacitor installation:
[IEV 436-01-07]
3.7 discharge device of a capacitor: A device which may be incorporated in a capaci-
tor, capable of reducing the voltage between the terminals practically to zero, within a
given time, after the capacitor has been disconnected from a network. [IEV 436-03-15
modified]
931-1 ©IEC:1996 –15 –
3.8 internal fuse of a capacitor: A fuse connected inside a capacitor unit, in series
with an element or a group of elements. [IEV 436-03-16]
3.9 overpressure disconnector for a capacitor:
A disconnecting device designed
to switch off the capacitor in the case of abnormal increase of the internal pressure.
[IEV 436-03-17 modified]
3.10 overtemperature disconnector for a capacitor:
A disconnecting device designed
to switch off the capacitor in the case of abnormal increase of
...