IEC 60252-1:2010/AMD1:2013

IEC 60252-1 ®
Edition 2.0 2013-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 1
AMENDEMENT 1
AC motor capacitors –
Part 1: General – Performance, testing and rating – Safety requirements –
Guidance for installation and operation

Condensateurs des moteurs à courant alternatif –
Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs
assignées – Règles de sécurité – Lignes directrices pour l'installation et
l'utilisation
IEC 60252-1:2010/A1:2013
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IEC 60252-1 ®
Edition 2.0 2013-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
AMENDMENT 1
AMENDEMENT 1
AC motor capacitors –
Part 1: General – Performance, testing and rating – Safety requirements –

Guidance for installation and operation

Condensateurs des moteurs à courant alternatif –

Partie 1: Généralités – Caractéristiques fonctionnelles, essais et valeurs

assignées – Règles de sécurité – Lignes directrices pour l'installation et

l'utilisation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 31.060.30; 31.060.70 ISBN 978-2-8322-1058-1

– 2 – 60252-1 Amend.1 © IEC:2013
FOREWORD
This amendment has been prepared by IEC technical committee 33: Power capacitors and
their applications.
The text of this amendment is based on the following documents:
FDIS Report on voting
33/532/FDIS 33/538/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base 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• withdrawn,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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
_____________
2 Normative references
Replace the reference to IEC 60529 by the following:
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
Replace the reference to ISO 4046 by the following:
ISO 4046:2002, Paper, board, pulps and related terms – Vocabulary
3 Terms and definitions
3.22
class of safety protection
Replace definition 3.22 by the following:

60252-1 Amend.1 © IEC:2013 – 3 –
3.22
class of safety protection
degree of safety protection identified by one of four codes to be marked on the capacitor
3.22.1
(SO) class of safety protection
degree of safety protection indicating that the capacitor type has no specific failure protection
Note 1 to entry: Formerly referred to as P0.
3.22.2
(S1) class of safety protection
degree of safety protection indicating that the capacitor type may fail in the open-circuit or
short-circuit mode and is protected against fire or shock hazard
Note 1 to entry: Compliance is verified by the test described in 5.16.3 and 5.16.5.
Note 2 to entry: Formerly referred to as P1.
3.22.3
(S2) class of safety protection
degree of safety protection indicating that the capacitor type has been designed to fail in the
open-circuit mode only and is protected against fire or shock hazard
Note 1 to entry: Compliance is verified by the test described in 5.16.3 and 5.16.5.
Note 2 to entry: formerly referred to as P2.
3.22.4
(S3) class of safety protection
degree of safety protection indicating that the capacitor is of segmented film construction as
defined in 3.6
Note 1 to entry: This capacitor type is required to fail with low residual capacitance (<1 % C ) and has protection
N
against fire and shock hazard. Compliance is verified by the test described in 5.16.4 and 5.16.6.

5.16 Destruction test
Replace Subclause 5.16 by the following:
5.16 Destruction test
5.16.1 General
This test is optional.
Refer to revised definition 3.22 for the appropriate test for each class of safety protection.
Capacitors marked S0 are not required to be tested in accordance with this subclause.
Capacitors fitted with overpressure disconnect device designated S1 and S2 shall be
subjected to the sequential DC and AC test described in 5.16.3 and 5.16.5.
Capacitors with segmented film as defined in 3.6 and designated S3 class of safety protection
shall be subjected to the simultaneous DC and AC test described in 5.16.4 and 5.16.6.
For capacitors designated S1, S2 and S3 refer to Figure 1.

– 4 – 60252-1 Amend.1 © IEC:2013
5.16 Destruction test
Class of safety
5.16.2 Test specimen Class of safety
protection
protection S3
S1 and S2
5.16.3 + 5.16.5 5.16.4 + 5.16.6
sequential destruction simultaneous destruction
test test
5.16.7 Evaluation
IEC  2199/13
Figure 1 – Destruction test
5.16.2 Test specimens
The test is to be carried out on 10 samples, with a similar specimen of 10 samples held in
reserve for possible retest. Half the test specimens (5) shall have passed the test according to
5.4.1. The remaining five capacitors shall have passed the endurance test described in 5.13
(group 2).
For capacitors with a metal case, the metal case shall be connected to one of the terminals of
the voltage source.
If a distinction can be made between the capacitor terminals, the group shall be subdivided
into two subgroups. The first subgroup shall have terminal A connected to the case, the
second subgroup shall have terminal B connected to the case.
5.16.3 Test apparatus for sequential DC and AC test (capacitor type S1 and S2)
5.16.3.1 Test apparatus for d.c. conditioning
Apparatus for carrying out the d.c. conditioning is shown in Figure 2. The d.c. source shall be
capable of delivering an open-circuit voltage equivalent to 10 U and have a sustained short
N
circuit capability greater than 50 mA.
R
mA
DC
V C
source
IEC  2157/10
Figure 2 – Test apparatus for d.c. conditioning

60252-1 Amend.1 © IEC:2013 – 5 –
The d.c. source is adjusted to provide an open-circuit voltage equivalent to 10 U with the
N
switch in position 1.
A variable resistor R is adjusted to provide a current of 50 mA with the switch in position 2.
DC voltage is applied to the test capacitor with the switch in position 3.
5.16.3.2 Test apparatus for a.c. destruction test
a) The instantaneous short-circuit current of the a.c. supply shall be at least 300 A.
b) A 25 A slow-blow fuse and adjustable inductance (L) shall be inserted between the a.c.
source and the capacitor (see Figure 3).
Fuse L
A
V1 V2
IEC  2158/10
Figure 3 – Test apparatus for a.c. destruction test
The inductor shall be so adjusted that, with the switch in position 1 and a voltage of 1,3 U
N
applied across the voltmeter V1, a current equal to 1,3 times the capacitor rated current (I )
N
flows.
The capacitor is energized with the switch in position 2.
NOTE The variable inductor L in Figure 3 may be replaced by the arrangement shown in Figure 4 whereby T2 is a
fixed ratio transformer and L is a fixed inductor. A variable ratio transformer T1 is used to adjust the inductive
f
current.
T2
L
T1
L
f
IEC  2159/10
Figure 4 – Arrangement to produce the variable inductor L in Figure 3
5.16.4 Test apparatus for simultaneous DC and AC test (capacitor type S3)

Apparatus for carrying out the simultaneous DC and AC test is shown in Figure 5. The d.c.
source (U ) shall be capable of delivering an open-circuit voltage equivalent to 10 U and
dc N
shall have a sustained short-circuit capability greater than 50 mA but limited to 50 mA during
the test.
C D 100 kΩ/5 kV
F
Tr L
I
U U
AC DC
V0 V2 V3
Cx
AC DC
R
IEC  2200/13
– 6 – 60252-1 Amend.1 © IEC:2013
Tr Transformer (AC power supply) with sufficient capacity to supply an instantaneous short-circuit
current of at least 300 A
F Slow-blow fuse, rated 25 A
L Inductor of approximately 10 mH for grid decoupling (resonant free in all switching modes)
C Capacitor for DC decoupling: C ≥ 10 × C (e.g. C = 330 µF -->C = 33 µF)/U = 5 kV
x xmax cmax
C Capacitor under test
x
D High voltage diode for AC decoupling
I AC current: 1,3 × I at the beginning of the test when the capacitor is full operative (I = Rated
1 R R
current of the capacitor under test)
V2 AC test voltage: 1,3 × U (U = Rated voltage of the capacitor under test)
R R
V3 DC test voltage: Voltage increase from 0 V to max. 10 × U at a rate of 200 V/min (U = Rated
R R
voltage of the capacitor under test)
R Resistor for capacitor discharging at the end of the test
Figure 5 – Test apparatus for simultaneous DC and AC
5.16.5 Test procedure for sequential DC and AC test (capacitor type S1 and S2)
5.16.5.1 General
The test shall be conducted in four stages:
• 5.16.5.2 Preparation and pre-conditioning,
• 5.16.5.3 DC conditioning,
• 5.16.5.4 AC destruction test,
• 5.16.7 Evaluation of the failure.
NOTE The purpose of the d.c. conditioning is to produce a dielectric breakdown condition. It is not the intention
that d.c. conditioning is used to create open-circuit capacitors.
5.16.5.2 Preparation and pre-conditioning
All the test specimens shall be prepared and pre-conditioned as follows:
The capacitors shall be wrapped closely in tissue paper complying with 6.86 of
ISO 4046:2002 and mounted within an "air circulating" test chamber at t + 10 °C. The
c
temperature deviation shall not exceed ±2 °C. In preparation for the destruction test, the
specimens shall have rated voltage (U ) applied for 2 h at t + 10 °C.
N c
No open-circuit or short-circuit capacitors are permitted. If this occurs, the type shall be
declared a failure.
5.16.5.3 DC conditioning
Five capacitors that have passed the endurance test (group 2) shall be pre-heated to a
temperature of t + 10 °C before d.c. conditioning. The remaining five capacitors, having
c
passed the test in 5.4.1 shall be tested at room temperature.
The voltage of a d.c. source (see Figure 2) shall be raised from zero to a maximum of 10 U
N
at a rate of approximately 200 V/min until a short-circuit occurs or 10 U has been reached.
N
Capacitors shall be removed from d.c. conditioning when the voltage indicated on the
voltmeter is zero or 10 U has been reached and maintained for a period of 5 min or other
N
period as defined by the manufacturer.
A capacitor that becomes open-circuit after the d.c. conditioning shall be replaced by another
sample and not counted. The d.c. conditioning test may be repeated on new samples until all
the 10 reserve specimens referred to in 5.16.1 have been used up. If the required number of

60252-1 Amend.1 © IEC:2013 – 7 –
capacitors with dielectric breakdown cannot be achieved, then the test shall be regarded as
failed.
5.16.5.4 AC destruction test
With the capacitors maintained at the d.c. conditioning temperature, they shall then have
applied an a.c. voltage of 1,3 U (see Figure 3) . If the capacitor clears (becomes operative)
N
or becomes open-circuit, the voltage shall be maintained for 5 min. If the capacitor is still
operative after 5 min then the d.c. conditioning shall be repeated.
If the capacitor becomes short-circuit then the test shall be maintained for 8 h.
5.16.6 Test procedure for simultaneous DC and AC test (capacitor type S3)
5.16.6.1 Preparation and pre-conditioning
Same as 5.16.5.2.
5.16.6.2 Simultaneous DC and AC test
Five capacitors that have passed the endurance test (group 2) shall be pre-heated to a
temperature of t + 10 °C before testing. The remaining five capacitors, having passed the test
c
in 5.4.1 shall be tested at room temperature.
Apply a constant a.c. voltage of 1,3 U at U (V ) and measure the initial current (I ).
N ac1 2 1
The voltage of a d.c. source U (V ) shall be raised from zero to a maximum of 10 U at a
dc1 3 N
rate of approximately 200 V/min until the capacitor becomes inoperative or 10 U has been
N
reached.
The capacitor shall be considered as failed if it does not become inoperative (capacitance
<1 % C ) within 5 minutes at 10 U
N N.
The d.c. current shall be limited to 50 mA.
NOTE Inoperat
...