SIST EN 61643-11:2002/A11:2008
(Main)Low-voltage surge protective devices -- Part 11: Surge protective devices connected to low-voltage power systems - Requirements and tests
Low-voltage surge protective devices -- Part 11: Surge protective devices connected to low-voltage power systems - Requirements and tests
Amandma A11:2008 je dodatek k standardu SIST EN 61643-11:2002
Is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages. These devices are packaged to be connected to 50/60 Hz and d.c. power circuits, and equipment rated up to 1000 V r.m.s. or 1500 V d.c. Performance characteristics, standard methods for testing, and ratings are established for these devices that contain at least one nonlinear component that is intended to limit surge voltages and divert surge currents.
Überspannungsschutzgeräte für Niederspannung -- Teil 11: Überspannungsschutzgeräte für den Einsatz in Niederspannungsanlagen - Anforderungen und Prüfungen
Parafoudres basse-tension -- Partie 11: Parafoudres connectés aux systèmes de distribution basse tension - Prescriptions et essais
Nizkonapetostne naprave za zaščito pred prenapetostnimi udari - 11. del: Naprave za zaščito pred prenapetostnimi udari za nizkonapetostne napajalne sisteme - Zahteve in preskusi
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 61643-11:2002/A11:2008
01-januar-2008
1L]NRQDSHWRVWQHQDSUDYH]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDULGHO 1DSUDYH
]D]DãþLWRSUHGSUHQDSHWRVWQLPLXGDUL]DQL]NRQDSHWRVWQHQDSDMDOQHVLVWHPH
=DKWHYHLQSUHVNXVL
Low-voltage surge protective devices - Part 11: Surge protective devices connected to
low-voltage power systems - Requirements and tests
Überspannungsschutzgeräte für Niederspannung - Teil 11: Überspannungsschutzgeräte
für den Einsatz in Niederspannungsanlagen -
Anforderungen und Prüfungen
Parafoudres basse-tension - Partie 11: Parafoudres connectés aux systemes de
distribution basse tension - Prescriptions et essais
Ta slovenski standard je istoveten z: EN 61643-11:2002/A11:2007
ICS:
29.120.50 9DURYDONHLQGUXJD Fuses and other overcurrent
PHGWRNRYQD]DãþLWD protection devices
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
SIST EN 61643-11:2002/A11:2008 en,fr
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 61643-11/A11
NORME EUROPÉENNE
January 2007
EUROPÄISCHE NORM
ICS 29.240.10
English version
Low-voltage surge protective devices -
Part 11: Surge protective devices
connected to low-voltage power systems -
Requirements and tests
Parafoudres basse-tension - Überspannungsschutzgeräte
Partie 11: Parafoudres connectés aux für Niederspannung -
systèmes de distribution basse tension - Teil 11: Überspannungsschutzgeräte für
Prescriptions et essais den Einsatz in Niederspannungsanlagen -
Anforderungen und Prüfungen
This amendment A11 modifies the European Standard EN 61643-11:2002; it was approved by CENELEC on
2006-07-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for giving this amendment the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This amendment exists in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CENELEC member into its own language and notified to the
Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61643-11:2002/A11:2007 E
---------------------- Page: 2 ----------------------
EN 61643-11:2002/A11:2007 – 2 –
Foreword
This amendment to the European Standard EN 61643-11:2002 was prepared by the Technical
Committee CENELEC TC 37A, Low voltage surge protective devices.
The text of the draft was submitted to the formal vote and was approved by CENELEC as amendment
A11 to EN 61643-11:2002 on 2006-07-01.
The following dates were fixed:
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-08-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2009-07-01
The following table gives an overview on the series of publications from TC 37A.
Present
Publication No Title
status
EN 61643-11 Low-voltage surge protective devices – Part 11: Surge protective devices connected Published
to low-voltage power systems – Requirements and testing methods
TS 61643-12 Low-voltage surge protective devices – Part 12: Surge protective devices connected Published
to low-voltage power systems –- Selection and application principles
EN 61643-21 Low-voltage surge protective devices – Part 21: Surge protective devices connected Published
to telecommunications and signalling networks – Performance requirements and
testing methods
TS 61643-22 Low-voltage surge protective devices – Part 22: Surge protective devices connected Published
to telecommunications and signalling networks – Selection and application principles
prEN 50XXX-X Low voltage surge protective devices – Surge protective devices for specific At working group
application including d.c. – Part X: Requirements and tests level
prTS 50XXX-Y Low voltage surge protective devices – Surge protective devices for specific At working group
application including d.c. – Part Y: Selection and application rules level
---------------------- Page: 3 ----------------------
– 3 – EN 61643-11:2002/A11:2007
3 Definitions
Replace the existing definitions by the following:
3.11
maximum continuous operating voltage U
c
the maximum r.m.s. voltage, which may be continuously applied to the SPD´s mode of protection
3.18
temporary overvoltage test value U
T
test voltage applied, for a specific duration, to the SPD to simulate the stress under TOV conditions
3.22
1,2/50 voltage impulse
voltage impulse with a virtual front time of 1,2 µs and a time to half-value of 50 µs where
– the front time is defined according to IEC 60060-1 to be 1,67 x (t - t ), where t and t are the
90 30 90 30
90 % and 30 % points on the leading edge of the waveform;
– the time to half-value is defined as the time between the virtual origin and the 50 % point on the
tail. The virtual origin is the point where a straight line, drawn through the 30 % and 90 % points
on the leading edge of the waveform, intersects the U = 0 line.
3.23
8/20 current impulse
current impulse with a virtual front time of 8 µs and a time to half-value of 20 µs where
– the front time is defined according to IEC 60060-1 to be 1,25 x (t - t ), where t and t are the
90 10 90 10
90 % and 10 % points on the leading edge of the waveform;
– the time to half-value is defined as the time between the virtual origin and the 50 % point on the
tail. The virtual origin is the point where a straight line, drawn through the 10 % and 90 % points
on the leading edge of the waveform, intersects the I = 0 line.
Delete definition 3.45 and replace by Void.
Add the following new definitions:
3.47
multipole SPD
type of SPD with more than one mode of protection, or a combination of electrically interconnected
SPDs offered as a unit
3.48
total discharge current I
Total
current which flows through the PE or PEN conductor of a multipole SPD during the total discharge
current test
NOTE 1 This test is used to check for the cumulative effects that occur when multiple modes of protection of a multipole SPD
conduct at the same time.
NOTE 2 I is particularly relevant for class I tested SPDs used for the purpose of lightning protection equipotential bonding
total
according to IEC 62305 series.
---------------------- Page: 4 ----------------------
EN 61643-11:2002/A11:2007 – 4 –
3.49
maximum continuous operating voltage of the power system (U )
cs
maximum r.m.s. voltage to which the SPD may be permanently subjected at the point of application of
the SPD
NOTE This only takes into account voltage regulation and/or voltage drop or increase. It is also called “actual maximum
system voltage” and is equal to 1,1 times U .
0
4 Classification
Add the following new subclause:
4.11 Multipole SPD (if declared by manufacturer)
Replace the title of Clause 5 by:
5 Preferred values
Add the following note at the beginning of Clause 5
NOTE Preferred values means values which are often used in practice. Depending on real conditions lower and in some cases
higher values may be needed.
Replace Subclause 5.1 by
5.1 Preferred values of peak impulse current for class I tests Ipeak
I : 25; 20; 12,5; 10 and 5 kA
peak
NOTE these values and related parameters are described in Table 3.
Add the following new subclause:
5.6 Preferred values for I
Total
Type 1: 100; 75 and 50 kA
Type 2: 80; 60; 40 and 20 kA
Type 3: not applicable
6 Requirements
6.1.1 Identification
Replace items e) and f) by the following:
e) Maximum continuous operating voltage U (one value for each mode of protection except if all
c
values are equal)
f) SPD type and discharge parameters for each mode of protection declared by the manufacturer:
– type 1 and I in kA or alternatively “T1“ (T1 in a square) and I in kA
imp imp
– type 2 and I in kA or alternatively “T2“ (T2 in a square) and I in kA
max max
– type 3 and U in kV or alternatively “T3“ (T3 in a square) and U in kV
oc oc
---------------------- Page: 5 ----------------------
– 5 – EN 61643-11:2002/A11:2007
Replace item p) by the following:
p) installation instructions (e.g. type of LV systems: TN, TT, IT etc , connections to LV systems and
rated system voltages for which the SPD is designed, mechanical dimensions, lead lengths, etc.)
Add a new item x) as follows:
x) Total discharge current I for multipole SPDs (if declared by the manufacturer)
Total
6.1.2 Marking
Replace the first sentence by the following:
Markings a), e), f), g), h), j), I), o) and q) in 6.1.1 are mandatory on the body, or permanently attached
to the body, of the SPD.
6.2.11 Short-circuit withstand capability
Replace the existing text of Subclause 6.2.11 by the following:
An overstressed (short-circuited) SPD shall withstand the power short-circuit currents that may occur
in service. Testing is in accordance with 7.7.3.
Replace Subclause 6.5.5 by the following:
6.5.5 Behaviour under temporary overvoltages
An SPD shall either withstand a TOV without changes in functionality, or fail in a manner described in
7.7.4 and 7.7.6.
NOTE The tests given in 7.7.4 and 7.7.6 do not take into account the possibility of a surge occurring simultaneously with a
TOV event.
6.5.5.1 TOVs caused by faults in the high (medium) voltage system
SPDs connected to PE and for use on power distribution systems shall be tested at U in accordance
T
with 7.7.4 and Table B.1.
6.5.5.2 TOVs caused by faults or disturbances in the low voltage system
If U is greater or equal to U there is no need to perform this test.
c
T
All other SPDs shall be tested using either the TOV voltages U given in Table B.1 or the TOV
T
voltages stated by the manufacturer according to 6.1.1 w), whichever values are higher. This test shall
be performed in accordance with 7.7.6.
Add the following new subclause:
6.5.6 Total discharge current I
Total
This test is only conducted if the manufacturer claims a total discharge current in accordance with
7.9.10.
International Electrotechnical Commission IEC
---------------------- Page: 6 ----------------------
EN 61643-11:2002/A11:2007 – 6 –
6.6 Additional test requirements for two-port SPDs and one-port SPDs with separate
input/output terminals
Add the following new subclause:
6.6.4 Overload behaviour
The SPD shall not be damaged or altered by overloads, which may occur in normal use. Compliance
with this requirement is checked according to 7.8.5.
7 Type tests
Replace the full clause by the following:
Type tests are carried out as indicated in Table 2 on three samples per test series. Within any test
series, the tests shall be carried out in the order given in Table 2. The order in which test series are
carried out may be varied.
If all samples pass a test series, the design of the SPD is acceptable for that test series. If two or more
test samples fail a test series, the SPD does not comply with this standard.
In the event that a single sample does not pass a test, this test, and those preceding in the same test
series that may have influenced the result of this test, shall be repeated with three new samples, but
this time no failure of any sample is allowed.
A set of three samples may be used for more than one test series, if agreed by the manufacturer.
If the SPD is an integral part of a product covered by another international standard, the requirements
of the other international standard shall apply to those parts of the product which do not belong to the
SPD section of the product.
7.1 General testing procedures
Add the following new paragraph after the first paragraph:
Unless otherwise specified, a.c. values given in this standard are r.m.s values.
Add the following new paragraph after the paragraph starting with “When not otherwise specified.”
If not otherwise specified, for all tests where a power supply at U is required, the voltage tolerance for
C
0
testing shall be U%.
c −5
Replace the existing Table 2 by the following new Table 2:
---------------------- Page: 7 ----------------------
– 7 – EN 61643-11:2002/A11:2007
Table 2 – Type test requirements where applicable for SPDs
ACCESSIBLE OUT OF REACH
Test
FIXED PORTABLE FIXED
Test description Subclause
series
Test class
I II III I II III I II III
6.1.1/6.1.2/7.2
1 Identification and marking Y Y Y Y Y Y Y Y Y
6.2.1/6.3/7.3
Terminals and connections Y Y Y Y Y Y Y Y Y
Testing for protection against direct
6.5.1/7.4
Y Y Y Y Y Y – – –
contact
Standby power consumption and
6.5.3/6.5.4/7.7.5
Y Y Y Y Y Y Y Y Y
residual current
2 Protection level 6.2.2/7.5
Determination of the presence of a
7.5.1
N N N N N N N N N
switching component
Residual voltage 7.5.2 Y Y – Y Y – Y Y –
7.5.3
Front of wave sparkover voltage Y Y – Y Y – Y Y –
7.5.4/7.5.5
Limiting voltage with combination wave – – Y – – Y – – Y
Determination of the magnitude of the
7.6.2 N N N N N N N N N
follow current
6.2.6/7.6
3 Operating duty test
Preconditioning 7.6.4 7.7.1 Y Y – Y Y – Y Y –
6.2.3/6.2.4/7.6.5/
Class I and II operating duty test
Y Y – Y Y – Y Y –
7.6.6/7.7.1
Class III operating duty test 6.2.5/7.6.7/7.7.1 – – Y – – Y – – Y
4 Class I and II total discharge current 6.5.6/7.9.10 N N – N N – N N –
5 6.2.7/7.7.2
Test of thermal stability Y Y Y Y Y Y Y Y Y
6.2.7/6.2.11/
6* Short-circuit withstand capability test
Y Y Y Y Y Y Y Y Y
7.7.3
7* TOV test 6.2.7/6.5.5/7.7.6 Y Y Y Y Y Y Y Y Y
6.2.7/6.5.5/7.7.4
TOV test Y Y Y Y Y Y Y Y Y
8 Flexible cables and cords and their
7.9.1 – – – Y Y Y – – –
connection
6.3/6.5.1.1/
Mechanical strength
Y Y Y Y Y Y Y Y Y
7.9.2.1
6.3/6.5.1.1/
Mechanical strength
– – – Y Y Y – – –
7.9.2.2
6.5.1.3/7.9.7
Insulation resistance Y Y Y Y Y Y Y Y Y
Dielectric withstand 6.2.10/7.9.8 Y Y Y Y Y Y Y Y Y
6.4/6.5.1/7.9.9
Environment, IP code Y Y Y Y Y Y Y Y Y
6.5.1.2/7.9.3
Heat resistance Y Y Y Y Y Y Y Y Y
6.2.8/7.9.5.1
Air clearances and creepage distances Y Y Y Y Y Y Y Y Y
Resistance to abnormal heat and fire 6.5.2/7.9.4 Y Y Y Y Y Y Y Y Y
Tracking resistance 6.2.9/7.9.6 Y Y Y Y Y Y Y Y Y
9 Additional tests for two-port SPDs and one port-SPDs with separate input/output terminals
6.6.1/7.8.1
Percentage voltage regulation Y Y Y Y Y Y Y Y Y
Rated load current 6.6.2/7.8.2 Y Y Y Y Y Y Y Y Y
Load side surge withstand 6.6.3/7.8.4 N N N N N N N N N
6.6.4/7.8.5
Overload behaviour N N N N N N N N N
Load side short-circuit withstand
6.2.7/7.8.3 Y Y Y Y Y Y N N N
capability test
10 Additional checks and tests
6.2.12
Status indicator operation Y Y Y Y Y Y Y Y Y
Isolation between separate circuits 6.2.13 Y Y Y Y Y Y Y Y Y
Y: applicable; N: not mandatory (optional); –: not applicable.
* For this test series more than one set of samples may be needed.
---------------------- Page: 8 ----------------------
EN 61643-11:2002/A11:2007 – 8 –
Replace the existing Table 3 by the following new Table 3:
Table 3 – Typical test values for class I test parameters
I Q W/R
peak
within 10 ms within 10 ms
within 50 µs
As kJ/Ω
kA
25 12,5 156
20 10 100
12,5 6,25 39
10 5 25
5 2,5 6,25
The following tolerances shall apply:
– I ±10 %;
peak
– Q ±20 %;
– W/R ±35 %.
7.1.2 Delete last paragraph
7.1.3 Class I and II voltage impulse test
Replace the paragraph that begins with “The measurement of the voltage …” by:
Oscillations exceeding 3 % of the peak value are not allowed at the rising portion of the voltage
impulse.
The measuring devices shall have an overall bandwidth of at least 25 MHz and the overshoot shall be
less than 3 %.
NOTE For SPDs with low nominal discharge currents the 20% value may be exceeded to ensure firing of the switching
components.
Replace the last paragraph by the following:
The short-circuit current of the test generator shall preferably be less than 20 % of the nominal
discharge current I , but sufficient to ensure that the SPD´s voltage switching component(s) conduct
n
during the test.
Add the following new subclause:
7.1.5 Testing of SPDs classified outdoor only and for mounting out of reach
For SPDs classified outdoor only and for mounting out of reach, the tests of 7.7 and 7.8 are performed
without the cubic wooden box.
NOTE Application of such SPDs inside closed shelters may require special attention.
7.5 Determination of the measured limiting voltage
Replace the first sentence of item b) by the following:
For a one-port SPD having terminals, the test is performed without external disconnectors and the
measured limiting voltage is measured at the terminals. For a one-port SPD having connecting leads,
the measured limiting voltage is measured with an external lead length of 150 mm.
---------------------- Page: 9 ----------------------
– 9 – EN 61643-11:2002/A11:2007
Replace the existing Figure 3 by the following new Figure 3:
Start
Test to determine
Class
Class III
the presence of
I or II What
a switching
is the class
component
test?
in the SPD
(see 7.5.1)
Test to measure
the residual
voltage with
8/20 current
impulse
(see 7.5.2)
Is
there a
No
switching
component?
Yes
Test to measure
Test to measure
the sparkover
the limiting
voltage with 1,2/50
voltage with
voltage impulse
the combination
(see 7.5.3)
wave
(see 7.5.4)
Maximum
voltage value
during the tests
performed
Tests
completed
Select U
p
(see 5.4)
IEC 003/98
Figure 3 – Test flow chart to determine the voltage protection level U
p
---------------------- Page: 10 ----------------------
EN 61643-11:2002/A11:2007 – 10 –
7.5.2 Test procedure to measure the residual voltage with 8/20 current impulses
Add a note after 7.5.2 a):
NOTE For testing SPDs containing a switching component, the rate of rise of the generator output voltage should be limited to
a value of 10 kV/µs.
Replace Subclause 7.5.3 by the following:
7.5.3 Test procedure to measure the front-of-wave sparkover voltage
The 1,2/50 voltage impulse is used. The generator voltage is set to an open circuit output voltage of
6 kV.
a) 10 impulses are applied to the SPD, five of positive and five of negative polarity.
b) The interval between individual impulses shall be long enough to allow the sample to cool down
to ambient temperature.
c) If sparkover is not observed during any of the 10 impulses on the front of the wave, then a) and b)
above are repeated with a generator open circuit output voltage of 10 kV.
d) The voltage at the SPD shall be recorded with an oscilloscope.
e) The measured limiting voltage is the maximum value of the sparkover voltages recorded during
the whole test sequence.
7.6.1 General
Delete the last sentence of the fourth paragraph, which reads “For the test of 7.5.3, the average of 10
measured peak values shall be used.”
Replace Subclause 7.6.3.2 by the following:
7.6.3.2 SPDs with follow current above 500 A
The test sample shall be connected to a power frequency voltage U with a prospective short-circuit
c
current equal to the follow current interrupt rating I declared by the manufacturer in accordance with
fi
Table 11, or 500 A, whichever is greater.
For SPDs connected between neutral and protective earth only, the prospective short-circuit current
shall be at least 100 A.
7.7.2.2 Thermal stability test
Replace the text of 7.7.2.2 by the following new text:
This test is not performed on SPDs containing only voltage switching components.
Test settings
This test shall be performed on each mode of protection; however, if some modes of protection have
identical circuitry, one single test can be performed on the mode of protection which presents the most
vulnerable configuration. This test procedure addresses two different designs:
– SPDs containing only voltage limiting components. In this case, the following procedure a) applies;
– SPDs containing both voltage limiting and voltage switching components. In this case, the
following procedure b) applies.
---------------------- Page: 11 ----------------------
– 11 – EN 61643-11:2002/A11:2007
Sample preparation
Any voltage switching component which is connected in series with a voltage limiting component shall
be short-circuited by a copper wire with a diameter such that it does not melt during the test.
For SPDs with different non-linear components connected in parallel, this test has to be performed for
every current path of the SPD by disconnecting/interrupting all the remaining current paths. If
components of the same type and parameters are connected in parallel, they shall be tested as one
current path.
The manufacturer shall provide samples prepared according to the above requirements.
a) Test procedure for SPDs having no switching component in series with other components
The test samples shall be connected to a power frequency source.
The voltage shall be high enough to allow a current to flow through the SPD. For this test, the current
is set to a constant value. The tolerance for the test current is ± 10 %. The test is started at a value of
2 mA r.m.s.
The starting point may be changed from 2 mA to a current corresponding to the maximum power
dissipation of the component, if it is known.
This value of current is then increased in steps of either 2 mA or 5 % of the previously adjusted test
current, whichever is greater.
Each step is maintained until thermal equilibrium is reached (i.e. variation of temperature less than 2 K
within 10 min).
The surface temperature on the hottest spot of the SPD (for accessible SPDs only) and the current
through the SPD are monitored continuously. The hottest spot of the SPD may be determined by an
initial test or alternatively many points may be monitored in order to determine the hottest spot.
This test is interrupted if all non-linear components under test are disconnected. The voltage shall not
be increased further in order to avoid any malfunction of the disconnector.
If the voltage across the SPD falls below U during the test, the current regulation is discontinued and
cs
the voltage is adjusted back to U and maintained for a duration of 15 min. Continuous current
cs
monitoring is therefore no longer required. The source shall have a short-circuit current capability
which will not limit the current before any disconnector operates. The maximum available current value
shall not exceed the short-circuit withstand capability declared by the manufacturer.
b) Test procedure for SPDs having a switching component in series with other components
The SPD is energized with a power frequency source at U and having a short-circuit current
Cs
capability which will not limit the current before any disconnector operates. The maximum available
current value shall not exceed the short-circuit withstand capability declared by the manufacturer.
If no significant current flows, test procedure a) shall be followed.
NOTE The usage of “no significant current” infers that the SPD has not entered its onset of conduction transition (i.e. SPD
remains thermally stable).
---------------------- Page: 12 ----------------------
EN 61643-11:2002/A11:2007 – 12 –
Pass criteria
If a disconnector operates, there shall be clear evidence of effective and permanent disconnection by
1)
the device. To check this, a power frequency voltage equal to U shall be applied for 1 min without
c
current flow in excess of 0,5 mA r.m.s.
Indoor SPDs:
The surface temperature rise shall be less than 120 K during the test. The surface temperature shall
not exceed 80 K above ambient temperature 5 min after the disconnector has operated.
During the test there shall be no expulsion of solid material.
Outdoor SPDs:
There shall be no evidence of burning and there shall be no expulsion of solid material.
Accessible SPDs:
After the test, SPDs having an IP degree equal or greater than IP20 shall not have live parts
accessible with the standardized test finger applied with a force of 5 N (see EN 60529), except the life
parts which were already accessible before the test when the SPD is fitted as in normal use.
Replace Subclause 7.7.3 by the following:
7.7.3 Short-circuit withstand capability
This test is not applied to SPDs which are either
– classified for outdoor use and mounted out of reach, or
– for connection N-PE in TN- and/or TT-systems only.
Test settings
Power frequency source characteristic:
The prospective short-circuit current and power factor at the SPD terminals, are given by the
manufacturer according to Table 11. The test voltage is set to U
CS.
Table 11 – Prospective short-circuit current and power factor
+5 0
Ip % Cosϕ
0 −0,05
kA
0,95
I ≤ 1,5
p
1,5 < I ≤ 3,0 0,9
p
3,0 < I ≤ 4,5 0,8
p
0,7
4,5 < I ≤ 6,0
p
0,5
6,0 < I ≤ 10,0
p
0,3
10,0 < I ≤ 20,0
p
20,0 < I ≤ 50,0 0,25
p
50,0 < I 0,2
p
NOTE Recovery voltage according to IEC 60947-1.
1)
Note for the reader: this is kept intentionally to U .
c
---------------------- Page: 13 ----------------------
– 13 – EN 61643-11:2002/A11:2007
The SPD itself and its disconnectors shall be placed in the centre of a cube shaped wooden box with
sides that are (500 ± 50) mm away from the SPD external surfaces. The internal surface of the box is
covered with muslin paper or cheese cloth. One of the box sides (not the bottom one) remains open in
order that the supply cables can be connected according to the manufacturer's instructions.
NOTE 1 Muslin paper: thin, soft and rather strong paper, generally used to wrap breakable objects and whose weight stands
2 2
between 12 g/m and 25 g/m .
2 2
NOTE 2 Cheese cloth: weighing approximately 29 g/m – 30 g/m and having a weave of 13 threads in one direction and 11
threads in the other direction per square centimetre.
The test sample shall be mounted in accordance with the manufacturer's published recommendations
and connected with conductors of the maximum cross section according to 7.3.1, keeping the cables
inside the box to a maximum length of 0,5 m each
Sample preparations
For SPDs with non-linear components connected in parallel, separate sets of three samples shall be
prepared in the manner described below for every current path of the SPD, which contains one or
more non-linear components described in 3.4 and 3.5
Voltage limiting components and voltage switching components described in 3.4 and 3.5 shall be
replaced by appropriate copper blocks, (dummies), ensuring that the internal connections and their
cross-section and surrounding material (e.g. resins) and packaging are not changed.
Samples according to the above requirement shall be provided by the manufacturer.
Test procedure
This test shall be performed at two different test settings with a separate set of prepared test samples
for each setting a) and b):
a) Test of the declared short circuit withstand capability:
The sample is connected to a power frequency source at U , having a prospective short-circuit
Cs
current according to the declared short-circuit withstand capability and power factor according to
Table 11.
The test is carried out twice with the short-circuit initiated at 45 electrical degrees and at 90
electrical degrees after the zero crossing of the voltage. If a replaceable or resettable internal or
external disconnector operates, the relevant disconnector shall be replaced or reset each time. If
the disconnector cannot be replaced or reset, the test is stopped.
b) Test at low short-circuit current:
A power frequency source at U , having a prospective short-circuit current of five times the rated
Cs
current of the maximum overcurrent protection (if declared by the manufacturer), and a power
factor according to Table 11, shall be applied for 5 s ± 0,5 s. If no external overcurrent protection is
required by the manufacturer, a prospective short-circuit current of 300 A is used. The test is
carried out once with the short-circuit initiated at 45 electrical degrees after the zero crossing of the
voltage.
Pass criteria
During the above two short-circuit tests, neither the muslin paper nor the cheese cloth shall catch fire.
In addition, during the test for the short circuit withstand capability, the power short-circuit current shall
be interrupted by one of the disconnectors (internal or external) required by the manufacturer.
Internal and/or special disconnectors not covered by another IEC standard:
If they operate there shall be clear evidence of effective and permanent disconnection. To check this,
a power frequency voltage equal to U shall be applied for 1 min to the disconnector(s) having
c
operated. The current flow shall not exceed 0,5 mA r.m.s.
---------------------- Page: 14 ----------------------
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.