SIST EN 60831-1:1999
(Main)Shunt power capacitors of the 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
Shunt power capacitors of the 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
Applies to self-healing capacitor units and banks intended to be used, in particular, for power-factor correction of a.c. power systems of up to and including 1000 V rated voltage and frequency 15 Hz to 60 Hz. Also applies to capacitors intended for use in power filter circuits.
Selbstheilende 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 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
S'applique aux condensateurs unitaires et aux batteries de condensateurs autorégénérateurs devant servir plus particulièrement à la correction du facteur de puissance des réseaux à courant alternatif à tension assignée égale ou inférieure à 1000 V et à fréquence comprise entre 15 et 60 Hz. S'applique également aux condensateurs destinés à être utilisés dans des circuits de filtrage.
Shunt power capacitors of the 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 60831-1:1996)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60831-1:1999
01-julij-1999
Shunt power capacitors of the 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 60831-
1:1996)
Shunt power capacitors of the 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
Selbstheilende 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 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 60831-1:1996
ICS:
31.060.70 0RþQRVWQLNRQGHQ]DWRUML Power capacitors
SIST EN 60831-1:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60831-1:1999
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SIST EN 60831-1:1999
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SIST EN 60831-1:1999
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SIST EN 60831-1:1999
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SIST EN 60831-1:1999
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SIST EN 60831-1:1999
NORME CEI
INTERNATIONALE IEC
831-1
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
1996-11
Condensateurs shunt de puissance
autorégénérateurs pour réseaux à courant
alternatif de tension assignée inférieure
ou égale à1 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 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
© CEI 1996 Droits de reproduction réservés
—Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in
utilisée sous quelque forme que ce soit et par aucun pro- any form or by any means, electronic or mechanical,
cédé, électronique ou mécanique, y compris la photocopie et including photocopying and microfilm, without permission
les microfilms, sans l'accord écrit de l'éditeur. in writing from the publisher.
Bureau Central de la Commission Electrotechnique Internationale 3, rue de Varembé Genève, Suisse
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
PRICE CODE
Men11yHaponnae 3nettrporexHHVecKaa KoMHCCHH
IEC
• Pour prix, voir catalogue en vigueur
•
For price, see current catalogue
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SIST EN 60831-1:1999
_ 3 _
831-1 ©IEC:1996
CONTENTS
Page
FOREWORD 7
SECTION 1: GENERAL
Clause
1 Scope and object 9
2 Normative references 11
3 Definitions 13
4 Service conditions 17
SECTION 2: QUALITY REQUIREMENTS AND TESTS
5 Test requirements 19
6 Classification of tests 21
7 Capacitance measurement and output calculation 23
8 Measurement of the tangent of the loss angle (tan 6) of the capacitor 23
9 Voltage tests between terminals 25
10 Voltage tests between terminals and container 27
11 Test of internal discharge device 29
12 Sealing test 29
13 Thermal stability test 29
14 Measurement of the tangent of the loss angle (tan 6) of the capacitor
at elevated temperature 33
15 Lightning impulse voltage test between terminals and container 33
16 Discharge test 35
17 Ageing test 35
18 Self-healing test 35
19 Destruction test 35
SECTION 3: OVERLOADS
20 Maximum permissible voltage 37
21 Maximum permissible current 39
SECTION 4: SAFETY REQUIREMENTS
22 Discharge device 39
23 Container connections 39
24 Protection of the environment 39
25 Other safety requirements 41
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SIST EN 60831-1:1999
831-1 ©I EC: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 45
29 Choice of the rated voltage 45
30 Operating temperature 47
31 Special service conditions 49
32 Overvoltages 51
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
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SIST EN 60831-1:1999
831-1 © IEC:1996 - 7 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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
FOREWORD
The IEC (International Electrotechnical Commission) is a worldwide organization for standardization
1)
comprising all national electrotechnical committees (IEC National Committees). The object of the 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, 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.
In order to promote international unification, IEC National Committees undertake to apply IEC International
4)
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 831-1 has been prepared by IEC technical committee 33:
Power capacitors.
This second edition cancels and replaces the first edition published in 1988, its amend-
ment 1 (1991), and amendment 2 (1993), and constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
33/234/FDIS
33/249/RVD
33/234A/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.
Annexe B is for information only.
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SIST EN 60831-1:1999
831-1 ©IEC:1996 – 9 –
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
Section 1: General
1 Scope and object
This part of IEC 831 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 831 also applies to capacitors intended for use in power filter circuits.
Additional definitions, requirements, and tests for filter capacitors are given in annex A.
The following capacitors are excluded from this part of IEC 831:
– Shunt power capacitors of the non-self-healing type for a.c. systems having a rated
voltage up to and including 1000 V (IEC 931).
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., should be
in accordance with the relevant IEC standards.
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SIST EN 60831-1:1999
831-1 © IEC:1996 - 11 -
The object of this part of IEC 831 is to:
a) formulate uniform rules regarding performances, testing and rating;
formulate specific safety rules;
b)
c) provide a guide for installation and operation.
2 Normative references
The following normative documents contain provisions which, through reference in this
text, constitute provisions of this part of IEC 831. 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 831 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.
International Electrotechnical Vocabulary (1EV) - Chapter 436: Power
IEC 50(436): 1990,
capacitors
1: General definitions and test
IEC 60-1: 1989, High voltage test techniques - Part
requirements
Recommendation for capacitors for inductive heat generating plants
IEC 110: 1973,
operating at frequencies between 40 and 24 000 Hz
IEC 143: 1992, Series capacitors for power systems
IEC 252: 1993, A.C. motor capacitors
IEC 269-1: 1986, Low-voltage fuses - Part 1: General requirements
IEC 358:1990, Coupling capacitors and capacitor dividers
IEC 831-2:1995, Shunt power capacitors of the self-healing type for a.c. systems having a
rated voltage up to and including 1000 V - Part 2: Ageing test, self-healing test and
destruction test
IEC 871-1: 1987, Shunt capacitors for a.c. power systems having a rated voltage above
woo V* — Part 1: General - Performance, testing and rating - Safety requirements -
Guide for installation and operation
IEC 931-1: 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 1: General - Performance,
testing and rating - Safety requirements - Guide for installation and operation
* According to Amendment No. 1 (1991).
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SIST EN 60831-1:1999
831-1 ©IEC:1996 -13 -
Shunt power capacitors of the non-self-healing type for a.c. systems
IEC 931-3: 1996,
having a rated voltage up to and including 1000 V - Pa rt 3: Internal fuses
Electromagnetic compatibility (EMC) - Part 2: Environment -
IEC 1000-2-2: 1990,
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
Capacitors for use in tubular fluorescent and other discharge lamp
IEC 1048: 1991,
circuits - General and safety requirements
Capacitors for use in tubular fluorescent and other discharge lamp
IEC 1049: 1991,
circuits - Performance requirements
Power electronic capacitors - Part 1: General
IEC 1071-1: 1993,
3 Definitions
For the purposes of this part of IEC 831, the following definitions apply:
A device consisting essentially of two electrodes
3 1 capacitor element (or element):
separated by a dielectric. [IEV 436-01-03]
An assembly of one or more capacitor elements in the
3.2 capacitor unit (or unit):
same container with terminals brought out. [IEV 436-01-04]
-healing capacitor: A capacitor of which the electrical properties, after local
3.3 self
breakdown of the dielectric, are rapidly and essentially restored. [IEV 436-03-12]
A number of capacitor units connected so as to act
3.4 capacitor bank (or bank):
together. [IEV 436-01-06]
In this part of IEC 831, the word capacitor is used when it is not
3.5 capacitor:
necessary 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]
A device which may be incorporated in a
3.7 discharge device of a capacitor:
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.
[IEV 436 03-15 modified]
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SIST EN 60831-1:1999
831-1 © 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 the internal temperature.
3.11 line terminal: A terminal intended for connection to a line conductor of a network.
[IEV 436-03-01]
NOTE — In polyphase capacitors, a terminal intended to be connected to the neutral conductor is not
considered to be a line terminal.
3.12 rated capacitance of a capacitor (CN):
The capacitance value for which the
capacitor has been designed. [IEV 436-01-12 modified]
3.13 rated output of a capacitor (ON): The reactive power derived from the rated
values of capacitance, frequency and voltage. [IEV 436-01-16 modified]
3.14 rated voltage of a capacitor (UN): The r.m.s. value of the alternating voltage for
which the capacitor has been designed. [IEV 436-01-15]
NOTE — In the case of capacitors consisting of one or more separate circuits (such as single-phase units
intended for use in polyphase connection, or polyphase units with separate circuits), UN refers to the rated
voltage of each circuit.
For polyphase capacitors with internal electrical connections between the phases, and for polyphase
capacitor banks, UN refers to the phase-to-phase voltage.
3.15 rated frequency of a capacitor (fN): The frequency for which the capacitor has
been designed. [IEV 436-01-14]
current of a capacitor (IN): The r.m.s. value of the alternating current for
3.16 rated
which the capacitor has been designed. [IEV 436-01-13]
3.17 capacitor losses: The active power dissipated in the capacitor. [IEV 436-04-10]
NOTE — All loss-producing components should be included, for example:
— for a unit, losses from dielectric, internal fuses, internal discharge resistor, connections, etc.;
—
for a bank, losses from units, external fuses, busbars, discharge and damping reactors, etc.
3.18 tangent of the loss angle (tan 8) of a capacitor: The ratio between the equivalent
series resistance and the capacitive reactance of the capacitor at specified sinusoidal
alternating voltage and frequency. [IEV 436-04-11]
3.19 maximum permissible a.c. voltage of a capacitor: The maximum r.m.s. alter-
nating voltage which the capacitor can sustain for a given time in specified conditions.
[IEV 436-04-07]
3.20 The maximum r.m.s. alter-
maximum permissible a.c. current of a capacitor:
nating current which the capacitor can sustain for a given time in specified conditions.
[IEV 436-04-09]
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SIST EN 60831-1:1999
831-1 ©IEC:1996 -17 -
3.21 ambient air temperature: The temperature of the air at the proposed location of
the capacitor.
3.22 cooling air temperature: The temperature of the cooling air measured at the
hottest position in the bank, under steady-state conditions, midway between two units.
If only one unit is involved, it is the temperature measured at a point approximately 0,1 m
away from the capacitor container and at two-thirds of the height from its base.
3.23 steady-state condition: Thermal equilibrium attained by the capacitor at constant
output and at constant ambient air temperature.
3.24 residual voltage: The voltage remaining on the terminals of a capacitor at a
ce rtain time following disconnection.
4 Service conditions
4.1 Normal service conditions
This standard gives requirements for capacitors intended for use in the following
conditions:
a) Residual voltage at energization
Not to exceed 10 % rated voltage (clause 22, clause 32, and annex B).
b) Altitude
Not exceeding 2000 m.
c) Ambient air temperature categories
Capacitors are classified in temperature categories, each category being specified by a
number followed by a letter. The number represents the lowest ambient air temperature
at which the capacitor may operate.
The letters represent upper limits of temperature variation ranges, having maximum values
specified in table 1. The temperature categories cover the temperature range of -50 °C to
+55 °C.
The lowest ambient air temperature at which the capacitor may be operated should be
chosen from the five preferred values +5 °C, -5 °C, -25 °C, -40 °C, -50 °C.
For indoor use, a lower limit of -5 °C is normally applicable.
Table 1 is based on service conditions in which the capacitor does not influence the
ambient air temperature (for example outdoor installations).
Table 1 - Letter symbols for upper limit of temperature range
Ambient temperature
oc
Symbol
Highest mean over any period of
Maximuum
24 h 1 year
A 40 30 20
B 45 35 25
30
C 50 40
55 35
D 45
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SIST EN 60831-1:1999
831-1 ©IEC:1996 - 19 -
NOTES
The temperature values according to table 1 can be found in the meteorological temperature table
1
covering the installation site.
2 Higher temperature values than those indicated in table 1 can be considered in special applications by
mutual agreement between manufacturer and purchaser. In that case, the temperature category should be
indicated by the combination of minimum and maximum temperature values, for example, -40/60.
If the capacitor influences the air temperature, the ventilation and/or choice of capacitor
shall be such that the table 1 limits are maintained. The cooling air temperature in such an
installation shall not exceed the temperature limits of table 1 by more than 5 °C.
Any combination of minimum and maximum values can be chosen for the standard
temperature category of a capacitor, for example -40/A or -5/C.
Preferred temperature categories are:
-40/A, -25/A, -5/A and -5/C.
4.2 Unusual service conditions
Unless otherwise agreed between manufacturer and purchaser, this standard does not
apply to capacitors, the service conditions of which, in general, are incompatible with the
requirements of the present standard.
Section 2: Quality requirements and tests
5 Test requirements
5.1 General
This clause gives the test requirements for capacitor units and, when specified, for
capacitor elements.
Supporting insulators, switches, instrument transformers, fuses, etc, shall be in
accordance with relevant IEC standards.
5.2 Test conditions
Unless otherwise specified for a particular test or measurement, the temperature of the
capacitor dielectric at the start of the test shall be in the range of +5 °C to +35 °C.
It may be assumed that the dielectric temperature is the same as the ambient temper-
ature, provided that the capacitor has been left in an unenergized state at constant
ambient temperature for an adequate period. When a correction has to be applied, the
reference temperature to be used is +20 °C, unless otherwise agreed between the manu-
facturer and the purchaser.
The a.c. tests and measurements shall be carried out at a frequency of 50 Hz or 60 Hz
independent of the rated frequency of the capacitor, if not otherwise specified.
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SIST EN 60831-1:1999
831-1 © IEC:1996 - 21 -
Capacitors having a rated frequency below 50 Hz shall be tested and measured at 50 Hz
or 60 Hz, if not otherwise specified.
6 Classification of tests
The tests are classified as:
6.1 Routine tests
Capacitance measurement and output calculation (see clause 7).
a)
Measurement of the tangent of the loss angle (tan 5) of the capacitor (see clause 8).
b)
c) Voltage test between terminals (see 9.1).
d) Voltage test between terminals and container (see 10.1).
e) Test of the internal discharge device (see clause 11).
f) Sealing test (see clause 12).
Routine tests shall have been carried out by the manufacturer on every capacitor before
delivery. If the purchaser so requests, he shall be supplied with a certificate detailing the
results of such tests.
In general, the indicated sequence of the tests is not mandatory.
6.2 Type tests
Thermal stability test (see clause 13).
a)
b) Measurement of the tangent of the loss angle (tan 5) of the capacitor at elevated
temperature (see clause 14).
c) Voltage test between terminals (see 9.2)
Voltage test between terminals and container (see 10.2).
d)
e) Lightning impulse voltage test between terminals and container (see clause 15).
f) Discharge test (see clause 16).
g) Ageing test (see clause 17).
h) Self-healing test (see clause 18).
i) Destruction test (see clause 19).
Type tests are carried out in order to ascertain that, as regards design, size, materials and
construction, the capacitor complies with the specified characteristics and operation
requirements detailed in this standard.
Unless otherwise specified, every capacitor sample to which it is intended to apply the
type test shall first have withstood satisfactorily the application of all the routine tests.
The type tests shall have been carried out by the manufacturer, and the purchaser shall,
on request, be supplied with a certificate detailing the results of such tests.
The successful completion of each type test is also valid for units having the same rated
voltage and lower output, provided that they do not differ in any way that may influence
the properties to be checked by the test. It is not essential that all type tests be carried out
on the same capacitor sample.
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SIST EN 60831-1:1999
831-1 ©IEC:1996 - 23 -
6.3 Acceptance tests
The routine and/or type tests, or some of them, may be repeated by the manufacturer in
connection with any contract by agreement with the purchaser. The kind of tests, the
number of samples that may be subjected to such repeated tests, and the acceptance
criteria shall be subject to agreement between manufacturer and purchaser, and shall be
stated in the contract.
7 Capacitance measurement and output calculation
7.1 Measuring procedure
The capacitance shall be measured at the voltage and at the frequency, chosen by
the manufacturer. The method used shall not include errors due to harmonics, or to
accessories external to the capacitor to be measured, such as reactors and blocking
circuits in the measuring circuit. The accuracy of the measuring method and the
correlation with the values measured at rated voltage and frequency shall be given.
The capacitance measurement shall be carried out after the voltage test between
terminals (see clause 9).
Measurement at a voltage between 0,9 and 1,1 times the rated voltage, and at a frequency
between 0,8 and 1,2 times the rated frequency, shall be performed on the capacitor used
for the thermal stability test (see clause 13), the ageing test (see clause 17), and the
self-healing test (see clause 18) before these tests, and could be performed on other
capacitors at the request of the purchaser in agreement with the manufacturer.
7.2 Capacitance tolerances
The capacitance shall not differ from the rated capacitance by more than:
-5 % to +15 % for units and banks up to 100 kvar;
0 % to +10 % for units and banks above 100 kvar.
The capacitance value is that measured under the conditions of 7.1
In three-phase units, the ratio of maximum to minimum value of the capacitance measured
between any two-line terminals shall not exceed 1,08.
NOTE — A formula for calculation of the output of a three-phase capacitor from single-phase capacitance
measurement is given in annex B.
8 Measurement of the tangent of the loss angle (tan 5) of the capacitor
8.1 Measuring procedure
The capacitor losses (or tan 8) shall be measured at the voltage and at the frequency
chosen by the manufacturer. The method used shall not include errors due to harmonics,
or to accessories external to the capacitor to be measured, such as reactors and blocking
circuits in the measuring circuit. The accuracy of the measuring method and the
correlation with the values measured at rated voltage and frequency shall be given.
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SIST EN 60831-1:1999
831-1 ©IEC:1996 - 25 -
The measurement of the capacitor losses shall be carried out after the voltage test
between terminals (see clause 9).
Measurement at a voltage between 0,9 and 1,1 times the rated voltage, and at a frequency
between 0,8 and 1,2 times the rated frequency shall be performed on the capacitor before
the thermal stability test (see clause 13), and may be performed on other capacitors on
request of the purchaser in agreement with the manufacturer.
NOTES
1 When testing a large number of capacitors, statistical sampling may be used for measuring tan S. The
statistical sampling plan should be by agreement between manufacturer and purchaser.
2 The tan S value of certain types of dielectric is a function of the energization time before the
measurement. In that case, test voltage and energization time should be by agreement between manufac-
turer and purchaser.
8.2
Loss requirements
The value of tan 8, measured in accordance with 8.1, shall not exceed the value declared
by the manufacturer for the temperature and voltage of the test, or the value agreed upon
between manufacturer and purchaser.
9 Voltage tests between terminals
9.1 Routine test
Each capacitor shall be subjected to an a.c. test at Ut = 2,15 UN for a minimum time of 2 s.
The a.c. test shall be carried out with a substantially sinusoidal voltage at a frequency
between 15 Hz and 100 Hz, and preferably as near as possible to the rated frequency.
During the test, no permanent puncture or flashover shall occur. Self-healing breakdowns
are permitted.
When the unit is composed of a number of elements, or a group of elements connected in
parallel, and which are tested separately, it is not necessary to repeat the test on the unit.
NOTES
1 For polyphase capacitors, the test voltages should be adjusted as appropriate.
2 Operation of internal element fuses is permitted, provided the capacitance tolerances are still met and
that not more than two fuses have operated per unit.
9.2 Type test
Each capacitor shall be subjected to an a.c. test at Ut = 2,15 UN for 10 s.
The a.c. test shall be carried out with a substantially sinusoidal voltage.
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SIST EN 60831-1:1999
831-1 © IEC:1996 - 27 -
During the test, no permanent puncture or flashover shall occur. Self-healing breakdowns
are permitted.
NOTES
1 For polyphase capacitors, the test voltages should be adjusted as appropriate.
2 Operation of internal element fuses is permitted, provided capacitance tolerances are still met, and
that not more than two fuses have operated per unit.
10 Voltage tests between terminals and container
10.1
Routine test
Units having all terminals insulated from the container shall be subjected to an a.c. voltage
applied between the terminals (joined together) and the container. If the rated voltage of
the capacitor is UN <_660 V, the voltage to be applied is 3 kV for 10 s or 3,6 kV for a
minimum time of 2 s. If the rated voltage of the capacitor is
UN >660 V, the voltage to be
applied is 6 kV for 10 s or 7,2 kV for a minimum time of 2 s.
During the test, neither puncture nor flashover shall occur.
The test shall be performed, even if, in se rvice, one of the terminals is intended to be
connected to the container.
Three-phase units having separate phase capacitance can be tested with respect to the
container with all the terminals joined to
...
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