EN 60099-4:2004/A1:2006
(Amendment)Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
Superseded by EN 60099-4:2014
Überspannungsableiter - Teil 4: Metalloxidableiter ohne Funkenstrecken für Wechselspannungsnetze
Parafoudres - Partie 4: Parafoudres à oxyde métallique sans éclateurs pour réseaux à courant alternatif
Prenapetostni odvodniki - 4. del: Kovinsko-oksidni prenapetostni odvodniki brez iskrišč za sisteme z izmenično napetostjo (IEC 60099-4:2004/A1:2006)
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Standards Content (Sample)
EUROPEAN STANDARD
EN 60099-4/A1
NORME EUROPÉENNE
August 2006
EUROPÄISCHE NORM
ICS 29.120.50; 20.240.10
English version
Surge arresters
Part 4: Metal-oxide surge arresters without gaps
for a.c. systems
(IEC 60099-4:2004/A1:2006)
Parafoudres Überspannungsableiter
Partie 4: Parafoudres à Teil 4: Metalloxidableiter ohne
oxyde métallique sans éclateurs Funkenstrecken für
pour réseaux à courant alternatif Wechselspannungsnetze
(CEI 60099-4:2004/A1:2006) (IEC 60099-4:2004/A1:2006)
This amendment A1 modifies the European Standard EN 60099-4:2004; 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, 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
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60099-4:2004/A1:2006 E
Foreword
The text of document 37/324/FDIS, future amendment 1 to IEC 60099-4:2004, prepared by IEC TC 37,
Surge arresters, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
amendment A1 to EN 60099-4:2004 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) 2007-04-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2009-07-01
__________
Endorsement notice
The text of amendment 1:2006 to the International Standard IEC 60099-4:2004 was approved by
CENELEC as an amendment to the European Standard without any modification.
__________
INTERNATIONAL IEC
STANDARD 60099-4
AMENDMENT 1
2006-05
Amendment 1
Surge arresters –
Part 4:
Metal-oxide surge arresters without gaps
for a.c. systems
This English-language version is derived from the original
bilingual publication by leaving out all French-language
pages. Missing page numbers correspond to the French-
language pages.
IEC 2006 Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical,
including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
S
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
60099-4 Amend. 1 IEC:2006 – 3 –
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
37/324/FDIS 37/325/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 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.
_____________
Page 3
CONTENTS
Replace, on page 7, the title of Annex N by the following new title:
Annex N (normative) Test procedure to determine the lightning impulse discharge capability
Page 9
Add:
Figure 13 – Examples of arrester units
Figure 14 – Short-circuit test setup
Figure 15 – Example of a test circuit for re-applying pre-failing current immediately before
applying the short-circuit test current
Delete the titles of Figures N.1, N.2 and N.3.
60099-4 Amend. 1 IEC:2006 – 5 –
Page 11
Add:
Table 14 – Test requirements
Table 15 – Required currents for short-circuit tests
Delete the titles of Tables N.1, N.2 and N.3.
Page 51
6.11 Short circuit
Replace the text of this subclause by the following:
An arrester for which a short-circuit rating is claimed by the manufacturer shall be subjected
to a short-circuit test according to 8.7 to show that the arrester will not fail in a manner that
causes violent shattering of the housing and that self-extinguishing of open flames (if any)
occurs within a defined period of time.
6.12.1 Disconnector withstand
Add to this subclause the following third dashed item:
– for surge arresters to be installed in overhead lines with system voltages exceeding 52 kV,
test of the lightning impulse discharge capability (see Annex N).
Page 53
Add, after 6.16, the following new subclause:
6.17 Lightning impulse discharge capability
For surge arresters to be installed in overhead lines with system voltages exceeding 52 kV,
the lightning impulse discharge capability shall be demonstrated by the tests and procedures
of Annex N.
Page 57
Table 3 – Arrester type tests
Delete all references to Annex N.
Page 75
Add, after 8.5.2.2, on page 77, the following new subclauses:
60099-4 Amend. 1 IEC:2006 – 7 –
8.5.2.3 Test procedure for resistor elements stressed at or above the reference voltage
If U is close to or above the reference voltage, it may not be possible to perform an
ct
accelerated ageing test at U , due to the extreme voltage dependence for the power losses
ct
and stability of available voltage source. If U ≥ 0,95*U and if it is not possible to perform
ct ref
an accelerated ageing test according to 8.5.2.1, this alternative test procedure shall apply and
replaces 8.5.2.1 and 8.5.2.2.
NOTE To provide an overview and to serve as an aid to understanding the procedure, the steps required are as
follows.
1) Calculate power loss, P , for the highest stressed resistor (at T = 40 °C and U = U ).
ct a c
2) Determine the steady-state temperature, T , for the highest stressed part of the arrester by using one of the
st
three alternative procedures of 8.5.2.3.1.
3) At a voltage U , determine the ratio, k , of power loss at 115 °C to power loss at T for the type of resistor
ct x st
elements used.
4) Perform an accelerated ageing test at constant power loss, k * P .
x ct
5) Interrupt the test for a short time and take measurements of power loss at specified time intervals.
6) If T > 60 °C, increase test temperature or test time.
st
7) Evaluate the power losses of step 5) according to 8.5.2.3.3.
8.5.2.3.1 Determination of test parameters
Calculate the power losses, P , per resistor element at the maximum ambient temperature of
ct
40 °C with the arrester energized at U , for the highest voltage stressed resistor according to
c
Annex L including the effect of the resistive current.
NOTE 1 For dead-front and liquid-immersed arresters, 65 °C and 95 °C, respectively, apply as maximum ambient
temperatures.
Select one of the three following test procedures to determine the steady-state temperature,
T , of the most stressed part of the arrester at maximum ambient temperature.
st
NOTE 2 The test procedures are considered to be conservative in increasing order from 1 to 3.
1. At an ambient temperature of 25 °C ± 10 K, energize the complete arrester at the claimed
U until steady-state temperature conditions have been attained. The temperature shall be
c
measured on resistor elements, at five points as evenly spaced as possible over the most
highly stressed 20 % portion of the length of each column of the arrester. If this 20 %
portion contains less than five resistor elements, the number of measuring points may be
limited to one point on each resistor element. The average temperature rise above
ambient of the resistor elements shall be added to the maximum ambient temperature to
obtain the temperature T .
st
2. At the maximum ambient temperature, energize a thermally pro-rated section
representative for the arrester type at a voltage level, which results in the same power
losses per resistor element as determined above. Keep the power losses constant by
adjusting the voltage if necessary. Measure the temperature of the resistors in steady-
state condition and calculate the average steady-state temperature, which is set equal to
T
st.
3. At an ambient temperature of 25 °C ± 10 K, energize a thermally pro-rated section
representative for the arrester type at a voltage level which results in the same power
losses per resistor element as determined above. Keep the power losses constant by
adjusting the voltage if necessary. Measure the temperature of the resistors in steady-
state condition and calculate the average steady-state temperature rise, ΔT , above
st
ambient. Determine the temperature, T by adding ΔT to the maximum ambient
st , st
temperature.
60099-4 Amend. 1 IEC:2006 – 9 –
The prorated section shall represent the steady-state thermal behaviour of the complete
arrester.
NOTE 3 The section may not necessarily be the same as that used for the operating duty test.
At a voltage U , determine the ratio, k , of power losses at 115 °C to power losses at T for
ct x st
the type of resistor elements used. For this test the voltage source shall fulfil the requirements
according to 8.5.1.
8.5.2.3.2 Test procedure
Three resistor samples shall be subjected to constant power losses equal to k *P (tolerance
x ct
+30
%) for 1 000 h. During the test, the temperature shall be controlled to keep the surface
temperature of the resistor at the required test temperature T ± 4 K. The applied test voltage
t
at the start of the test shall be not less than 0,95*U .
ct
If the temperature, T , is equal to or below 60 °C, T shall be 115 °C. If T is above 60 °C,
st t st
either the test temperature or the testing time shall be increased as follows.
a) Increase of the test temperature
= 115 + (T – T – ΔT )
T
t st a,max n
where
T is the test temperature in °C;
t
T is the steady-state temperature of the resistors in °C;
st
T is the maximum ambient temperature in °C;
a,max
ΔT = 20 K.
n
NOTE 1 For liquid-immersed arresters ΔT = 25 K, which results from the requirement that the operating duty test
n
starting temperature for these arresters (120 °C) is 25 K above the maximum ambient temperature (95 °C), while
for other arresters the difference between the operating duty test starting temperature and the maximum ambient
temperature is 20 K.
b) Increase of the testing time
ΔT/10
t = t * 2,5
where
t is the testing time in h;
t = 1 000 h;
ΔT is the temperature above 60 °C.
NOTE 2 For dead-front and liquid-immersed arresters, t is 2 000 h and 7 000 h, respectively, and ΔT is the
temperature above 85 °C and 120 °C, respectively.
8.5.2.3.3 Determination of elevated rated and continuous operating voltages
The three test samples shall be heated to T ± 4 K and subjected to the constant power losses
t
k *P . One to two hours after the voltage application, the voltage is adjusted to a voltage in
x ct
the range 0,95* U to U and the power losses, P , are measured. During the test, after
ct ct 1ct
30 %, 50 % and 70 % of the testing time, the measurement of power losses is repeated under
the same conditions with respect to temperature and voltage. The minimum power loss values
at these times are designated as P . At the end of the ageing test, under the same
3ct
conditions with regard to block temperature and at the same voltage, the power losses P
2ct
are determined.
60099-4 Amend. 1 IEC:2006 – 11 –
• If P is equal to or below 1,1 times P , then the test according to 8.5.4 and 8.5.5 shall
2ct 3ct
be performed on new resistors:
– if P is equal to or less than P , U and U are used without any modification;
2ct 1ct sc sr
– if P > P , the ratio P /P is determined for each sample. The highest of these
2ct 1ct 2ct 1ct
ratios is called K . On three new resistors at ambient temperature, the power losses
ct
P and P are measured at U and U , respectively. Thereafter, the voltages are
1c 1r sc sr
increased so that the corresponding power losses P and P fill the relation:
2c 2r
P P
2c 2r
= K ; = K
ct ct
P P
1c 1r
U * and U * are the highest of the three increased voltages obtained. As an alternative,
c r
aged resistors may also be used after agreement between the user and the manufacturer.
• If P is greater than 1,1 times P , and P is greater than or equal to P , then aged
2ct 3ct 2ct 1ct
resistors shall be used for the following test of 8.5.4 and 8.5.5. New resistors with
corrected values U * and U * can be used, but only after agreement between the user and
c r
the manufacturer.
Aged resistors are, by definition, resistors tested according to 8.5.2.3.2.
These cases are summarized in Table 7.
Where aged resistors are used in the operating duty test, it is recommended that the time
delay between the ageing test and the operating duty test be not more than 24 h.
The measuring time should be short enough to avoid increased power loss due to heating.
Page 9
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