IEC 60099-4:2004/AMD2:2009

Amendment 2 - Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems

Amendement 2 - Parafoudres - Partie 4: Parafoudres à oxyde métallique sans éclateurs pour réseaux à courant alternatif

General Information

• Status: Published
• Publication Date: 25-Feb-2009
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 29.240.10 - Substations. Surge arresters
• Technical Committee: TC 37 - Surge arresters
• Drafting Committee: MT 4 - TC 37/MT 4
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 30-Jun-2014

Relations

• Amends: IEC 60099-4:2004 - Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
• Effective Date: 05-Sep-2023
• Revised: IEC 60099-4:2014 - Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60099-4 ®
Edition 2.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Surge arresters –
Part 4: Metal-oxide surge arresters without gaps for a.c. systems

Parafoudres –
Partie 4: Parafoudres à oxyde métallique sans éclateurs pour réseaux à courant
alternatif
IEC 60099-4:2004/A2:2009
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IEC 60099-4 ®
Edition 2.0 2009-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AMENDMENT 2
AMENDEMENT 2
Surge arresters –
Part 4: Metal-oxide surge arresters without gaps for a.c. systems

Parafoudres –
Partie 4: Parafoudres à oxyde métallique sans éclateurs pour réseaux à courant
alternatif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
M
CODE PRIX
ICS 29.240.10; 29.120.50 ISBN 978-2-88910-056-9
– 2 – 60099-4 Amend.2 © IEC:2009

FOREWORD
This amendment has been prepared by IEC technical committee 37: Surge arresters.

The text of this amendment is based on the following documents:

FDIS Report on voting
37/354/FDIS 37/357/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 maintenance result 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• withdrawn,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.
_____________
Replace definitions 3.66, 3.67 and 3.68 with the following new definitions:
3.66
specified long-term load
SLL
force perpendicular to the longitudinal axis of an arrester, allowed to be continuously applied
during service without causing any mechanical damage to the arrester
3.67
specified short-term load
SSL
greatest force perpendicular to the longitudinal axis of an arrester, allowed to be applied
during service for short periods and for relatively rare events (for example, short-circuit

current loads and extreme wind gusts) without causing any mechanical damage to the
arrester
NOTE SSL does not relate to mechanical strength requirements for seismic loads. See M.2.
3.68
mean breaking load
MBL
the average breaking load for porcelain or cast resin-housed arresters determined from tests

60099-4 Amend.2 © IEC:2009 – 3 –

6.14.1 Bending moment
Change NOTE 1 of Subclause 6.14.1 as follows:

NOTE 1 When determining the mechanical load applied to a surge arrester, the user should consider, for

example, wind, ice and electromagnetic forces likely to affect the installation.

Add the following subclause to 6.14:

6.14.4 Mean value of breaking load (MBL)

The MBL shall be ≥ 1,2 times the specified short-term load (SSL) (see 8.9.4).

Replace the existing Subclause 8.9 by the following new Subclause 8.9:
8.9 Test of the bending moment
This test applies to porcelain and cast-resin housed arresters for U > 52 kV. It also applies
m
to porcelain and cast-resin housed arresters for U ≤ 52 kV for which the manufacturer claims
m
cantilever strength.
The complete test procedure is shown by the flow chart in Annex M.
8.9.1 General
This test demonstrates the ability of the arrester to withstand the manufacturer's declared
values for bending loads. Normally, an arrester is not designed for torsional loading. If an
arrester is subjected to torsional loads, a specific test may be necessary by agreement
between manufacturer and user.
The test shall be performed on complete arrester units without internal overpressure. For
single-unit arrester designs, the test shall be performed on the longest unit of the design.
Where an arrester contains more than one unit or where the arrester has different specified
bending moments in both ends, the test shall be performed on the longest unit of each
different specified bending moment, with loads determined according to M.1.
The test shall be performed in two parts that may be done in any order:

– a bending moment test to determine the mean value of breaking load (MBL);
– a static bending moment test with the test load equal to the specified short-term load
(SSL), i.e. the 100 % value of M.3.
8.9.2 Sample preparation
One end of the sample shall be firmly fixed to a rigid mounting surface of the test equipment,
and a load shall be applied to the other (free) end of the sample to produce the required
bending moment at the fixed end. The direction of the load shall pass through and be
perpendicular to the longitudinal axis of the arrester. If the arrester is not axi-symmetrical with
respect to its bending strength, the manufacturer shall provide information regarding this non-
symmetric strength, and the load shall be applied in an angular direction that subjects the
weakest part of the arrester to the maximum bending moment.

– 4 – 60099-4 Amend.2 © IEC:2009

8.9.3 Test procedure
8.9.3.1 Test procedure to determine mean value of breaking load (MBL)

Three samples shall be tested. If the test to verify the SSL (see 8.9.3.2) is performed first,
then samples from that test may be used for determination of MBL. The test samples need not

contain the internal parts. On each sample, the bending load shall be increased smoothly until

breaking occurs within 30 s to 90 s. “Breaking” includes fracture of the housing and damages

that may occur to fixing device or end fittings.

The mean breaking load, MBL, is calculated as the mean value of the breaking loads for the

test samples.
NOTE Care should be taken because the housing of an arrester can splinter while under load.
8.9.3.2 Test procedure to verify the specified short-term load (SSL)
Three samples shall be tested. The test samples shall contain the internal parts. Prior to the
tests, each test sample shall be subjected to a leakage check (see 9.1 d)) and an internal
partial discharge test (see 9.1 c)). If these tests have been performed as routine tests, they
need not be repeated at this time.
+5
On each sample, the bending load shall be increased smoothly to SSL, tolerance %, within
−0
30 s to 90 s. When the test load is reached, it shall be maintained for 60 s to 90 s. During this
time the deflection shall be measured. Then the load shall be released smoothly and the
residual deflection shall be recorded. The residual deflection shall be measured in the interval
1 min to 10 min after the release of the load.
NOTE 1 Care should be taken because the housing of an arrester may break and splinter while under load.
NOTE 2 Agreement must be made with the manufacturer if it is necessary for any reason to apply a load that is
more than 5 % above SSL.
8.9.4 Test evaluation
The arrester shall have passed the test if
– the mean value of breaking load, MBL, is ≥ 1,2 x SSL;
– for the SSL test
– there is no visible mechanical damage;
– the remaining permanent deflection is ≤ 3 mm or ≤ 10 % (whichever is greater) of
maximum deflection during the test;

– the test samples pass the leakage test in accordance with 9.1 d);
– the internal partial discharge level of the test samples does not exceed the value
specified in 9.1 c);
60099-4 Amend.2 © IEC:2009 – 5 –

Replace the existing Subclause 8.10 by the following new Subclause 8.10:

8.10 Environmental tests
These tests apply to porcelain and cast resin-housed arresters.

8.10.1 General
The environmental tests demonstrate by accelerated test procedures that the sealing

mechanism and the exposed metal combinations of the arrester are not impaired by

environmental conditions.
The test shall be performed on complete arrester units of any length.
For arresters with an enclosed gas volume and a separate sealing system, the internal parts
may be omitted.
Arresters whose units differ only in terms of their lengths, and which are otherwise based on
the same design and material, and have the same sealing system in each unit, are considered
to be the same type of arrester.
8.10.2 Sample preparation
Prior to the tests, the test sample shall be subjected to the leakage check of 9.1 d).
8.10.3 Test procedure
The tests specified below shall be performed on one sample in the sequence given.
8.10.3.1 Temperature cycling test
The test shall be performed according to test Nb of IEC 60068-2-14.
The hot period shall be at a temperature of at least +40 °C, but not higher than
+70 °C. The cold period shall be at least 85 K below the value actually applied in the hot
period; however, the lowest temperature in the cold period shall not be lower than –50 °C:
– temperature change gradient: 1 K/min;
– duration of each temperature level: 3 h;
– number of cycles: 10.
8.10.3.2 Salt mist test
The test shall be performed according to Clauses 4 and Subclause 7.6, as applicable, of
IEC 60068-2-11:
– salt solution concentration:  5 % ± 1 % by weight;
– test duration: 96 h.
8.10.4 Test evaluation
The arrester shall have passed the tests if the sample passes the leakage check in
accordance with 9.1 d).
– 6 – 60099-4 Amend.2 © IEC:2009

10.6 Requirements
Add the following items to 10.6:

6.14.1 Bending moment – reference to 10.8.9

6.14.3 Insulating base – reference to 10.8.9. Environmental tests do not apply

6.14.4 does not apply
10.8.1 General
Add the following items to 10.8.1:
9) Test of the bending moment – see 10.8.9
10) Environmental tests do not apply
Delete the following item from 10.8.1:
13) Moisture ingress test
10.8.9 Test of the bending moment
Replace the existing Subclause 10.8.9 by the following new Subclause 10.8.9:
10.8.9 Test of the bending moment
This test applies to polymer (except cast-resin) housed arresters (with and without enclosed
gas volume) for U > 52
...