IEC 60099-6:2002

INTERNATIONAL IEC
STANDARD
60099-6
First edition
2002-08
Surge arresters –
Part 6:
Surge arresters containing both series
and parallel gapped structures –
Rated 52 kV and less
Reference number
Publication numbering
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INTERNATIONAL IEC
STANDARD
60099-6
First edition
2002-08
Surge arresters –
Part 6:
Surge arresters containing both series
and parallel gapped structures –
Rated 52 kV and less
 IEC 2002  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
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 60099-6  IEC:2002(E)
CONTENTS
FOREWORD . 4

INTRODUCTION .5

1 General . 6

1.1 Scope . 6

1.2 Normative references . 6

2 Definitions . 7
3 Identification and classification .14
3.1 Arrester identification.14
3.2 Arrester classification .14
4 Standard ratings .15
4.1 Standard rated voltages.15
4.2 Standard rated frequencies.15
4.3 Standard nominal discharge currents.15
4.4 Service conditions .15
5 Requirements .16
5.1 Insulation withstand of the arrester housing.16
5.2 Reference voltage .16
5.3 Impulse protective levels .16
5.4 Partial discharges .16
5.5 Seal leakage.16
5.6 Thermal stability .16
5.7 Long duration current impulse withstand.16
5.8 Operating duty.17
5.9 Power frequency voltage versus time characteristics of an arrester .17
5.10 Short-circuit withstand .18
5.11 Disconnectors.18
5.12 Requirements for internal and external grading components .18
5.13 Power frequency sparkover .18
5.14 Grading current .18
5.15 Weather ageing tests.18

6 General procedures .18
6.1 Measuring equipment and accuracy.18
6.2 Reference voltage measurements.19
6.3 Test samples .19
7 Type tests (design tests).19
7.1 General .19
7.2 Insulation withstand tests on the arrester housing.20
7.3 Impulse protective level tests.21
7.4 Long duration current impulse withstand test .25
7.5 Operating duty tests .27
7.6 Tests of arrester disconnectors.33
7.7 Power frequency voltage sparkover tests.35
7.8 Moisture ingress tests.35
7.9 Weather ageing tests.35

60099-6  IEC:2002(E) – 3 –
8 Routine tests and acceptance tests.36

8.1 Routine tests .36

8.2 Acceptance tests .36

Annex A (normative) Abnormal service conditions .39

Annex B (normative) Test to verify thermal equivalency between complete arrester

and arrester section .40

Annex C (normative) Procedure to verify the power frequency voltage versus time
characteristics of an arrester.41

Annex D (normative) Artificial pollution testing of metal-oxide surge arresters
containing gapped structures .42
Annex E (informative) Typical information given with inquiries and tenders .43
Annex F (informative) Typical maximum protective levels.45
Bibliography.46
Figure 1 – Power losses of arrester at elevated temperatures vs. time .30
Table 1 – Arrester classification and tests .14
Table 2 – Steps of rated voltages.15
Table 3 – Peak currents for switching impulse residual voltage tests.22
Table 4 – Parameters for the line discharge test (10 000 A arresters) .26
Table 5 – Requirements for the long-duration current impulse test
on 5 000 A and 2 500 A arresters.27
Table 6 – Arrester design and ageing test requirements.28
Table 7 – Determination of elevated rated and continuous operating voltages.30
Table 8 – Requirements for high current impulses.32
Table 9 – Weather ageing test selection.35
Table 10 – Summary of high current operating duty test (see 7.5.3) .38
Table 11 – Thermal stability test .38
Table F.1 – Typical maximum protective levels for 10 kA, 5 kA, 2,5 kA and 1,5 kA
arresters per unit of rated voltage .45

– 4 – 60099-6  IEC:2002(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION

___________
SURGE ARRESTERS –
Part 6: Surge arresters containing both series

and parallel gapped structures –

Rated 52 kV and less
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization 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 specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
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 lEC 60099-6 has been prepared by lEC technical committee 37: Surge
arresters.
The text of this standard is based on the following documents:
FDIS Report on voting
37/282/FDIS 37/283/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
Annexes A, B, C and D form an integral part of this standard.
Annexes E and F are for information only.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
The committee has decided that the contents of this publication will remain unchanged until 2004.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60099-6  IEC:2002(E) – 5 –
INTRODUCTION
This part of IEC 6009
...