EN 60099-9:2014

Surge arresters - Part 9: Metal-oxide surge arresters without gaps for HVDC converter stations

IEC 60099-9:2014 applies to non-linear metal-oxide resistor type surge arresters without spark gaps designed to limit overvoltages in HVDC converter stations of two terminal, multiterminal and back-to-back type up to and including an operating voltage of 1 100 kV. The standard applies in general to porcelain-housed and polymer-housed type arresters but also to gas-insulated metal enclosed arresters (GIS-arresters) solely used as d.c. bus and d.c. line/cable arresters. Arresters for voltage source converters are not covered. Arresters applied on the a.c. systems at the converter station and subjected to power-frequency voltage of 50 or 60 Hz principally without harmonics are tested as per IEC 60099-4. The arresters on a.c.-filters are tested according to this standard. Keywords: testing of gapless metal-oxide surge arrestors for HVDC converter stations

Überspannungsableiter - Teil 9: Metalloxidableiter ohne Funkenstrecken für HGÜ-Stromrichterstationen

Parafoudres - Partie 9: Parafoudres à oxyde métallique sans éclateur pour postes de conversion CCHT

L'IEC 60099-9:2014 s'applique aux parafoudres à résistance variable à oxyde métallique sans éclateur conçus pour limiter les surtensions dans les postes de conversion CCHT de types bi pôles, multi pôles et dos à dos, jusqu'à et y compris une tension de régime de 1 100 kV. La norme s'applique généralement aux parafoudres à enveloppe en porcelaine et à enveloppe synthétique, mais également aux parafoudres sous enveloppe métallique à isolation gazeuse (parafoudres blindés ou parafoudres GIS) utilisés seulement comme parafoudres de bus c.c. et comme parafoudres de câble/ligne c.c. Les parafoudres pour convertisseurs de source de tension ne sont pas couverts. Les parafoudres appliqués sur les réseaux à courant alternatif au poste de conversion et soumis à une tension à fréquence industrielle de 50 Hz ou 60 Hz principalement sans harmonique sont soumis à essai selon l'IEC 60099-4. Les parafoudres sur les filtres c.a. sont soumis à essai selon la présente norme. Mots clés: essais des parafoudres sans éclateur à oxyde métallique dans les postes de conversion CCHT

Prenapetostni odvodniki - 9. del: Kovinskooksidni prenapetostni odvodniki brez iskrišč za enosmerne visokonapetostne pretvorniške postaje (IEC 60099-9:2014)

Standard EN IEC 60099-9 se uporablja za kovinskooksidne prenapetostne odvodnike z nelinearnimi upori brez iskrišč za omejevanje prenapetosti v enosmernih visokonapetostnih pretvorniških postajah z dvema priključkoma, več priključki in zaporedne vrste do vključno obratovalne napetosti 1100 kV. Standard se na splošno uporablja za odvodnike v porcelanskem in polimernem ohišju, pa tudi za plinsko izolirane odvodnike v kovinskem ohišju (odvodniki GIS), ki se uporabljajo izključno kot enosmerni odvodniki z vodili in enosmerni linijski/kabelski odvodniki. Odvodniki za napetostne pretvornike niso obravnavani. Odvodniki, ki se uporabljajo v izmeničnih sistemih pri pretvorniški postaji in so načeloma brez harmonikov podvrženi napetosti pri napajalni frekvenci 50 ali 60 Hz, se preskusijo v skladu s standardom IEC 60099-4. Odvodniki pri izmeničnih filtrih se preskusijo v skladu s tem standardom.

General Information

• Status: Published
• Publication Date: 11-Sep-2014
• Withdrawal Date: 30-Jul-2017
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• ICS: 29.240.10 - Substations. Surge arresters
• Technical Committee: CLC/SR 37 - Surge arresters
• Drafting Committee: IEC/TC 37 - IEC_TC_37
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 12-Sep-2014
• Completion Date: 12-Sep-2014
• Ref Project: SIST EN 60099-9:2014 - Surge arresters - Part 9: Metal-oxide surge arresters without gaps for HVDC converter stations

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2014
3UHQDSHWRVWQLRGYRGQLNLGHO.RYLQVNRRNVLGQLSUHQDSHWRVWQLRGYRGQLNLEUH]
LVNULãþ]DHQRVPHUQHYLVRNRQDSHWRVWQHSUHWYRUQLãNHSRVWDMH,(&
Surge arresters - Part 9: Metal-oxide surge arresters without gaps for HVDC converter
stations
Ta slovenski standard je istoveten z: EN 60099-9:2014
ICS:
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60099-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2014
ICS 29.240.10; 29.120.50
English Version
Surge arresters - Part 9: Metal-oxide surge arresters without
gaps for HVDC converter stations
(IEC 60099-9:2014)
Parafoudres - Partie 9: Parafoudres à oxyde métallique Überspannungsableiter - Teil 9: Metalloxidableiter ohne
sans éclateur pour postes de conversion CCHT Funkenstrecken für HGÜ-Stromrichterstationen
(CEI 60099-9:2014) (IEC 60099-9:2014)
This European Standard was approved by CENELEC on 2014-07-31. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard 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 CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard 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 CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2014 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60099-9:2014 E
Foreword
The text of document 37/417/FDIS, future edition 1 of IEC 60099-9, prepared by IEC/TC 37 "Surge
arresters" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
– latest date by which the document has to be implemented at (dop) 2015-05-01
national level by publication of an identical national
standard or by endorsement
– latest date by which the national standards conflicting with (dow) 2017-07-31
the document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60099-9:2014 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60071-1 NOTE Harmonized as EN 60071-1.
IEC 60143-1 NOTE Harmonized as EN 60143-1.
IEC 60633:1998 NOTE Harmonized as EN 60633:1999 (not modified).
IEC 60507 NOTE Harmonized as EN 60507.
IEC 62271-1:2007 NOTE Harmonized as EN 62271-1:2008 (not modified).
ISO 4892-1 NOTE Harmonized as EN ISO 4892-1.
ISO 4892-2 NOTE Harmonized as EN ISO 4892-2.
ISO 4892-3 NOTE Harmonized as EN ISO 4892-3.

- 3 - EN 60099-9:2014
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is
available here: www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 60060-1 -  High-voltage test techniques - EN 60060-1 -
Part 1: General definitions and test
requirements
IEC 60060-2 -  High-voltage test techniques - EN 60060-2 -
Part 2: Measuring systems
IEC 60068-2-11 1981 Environmental testing - EN 60068-2-11 1999
Part 2: Tests - Test Ka: Salt mist
IEC 60068-2-14 -  Environmental testing - EN 60068-2-14 -
Part 2-14: Tests - Test N: Change of
temperature
IEC 60068-2-17 -  Environmental testing - EN 60068-2-17 -
Part 2: Tests - Test Q: Sealing
IEC 60071-2 1996 Insulation co-ordination - EN 60071-2 1997
Part 2: Application guide
IEC 60099-4 (mod) 2004 Surge arresters - EN 60099-4 2004
Part 4: Metal-oxide surge arresters without
gaps for a.c. systems
IEC 60143-2 -  Series capacitors for power systems - EN 60143-2 -
Part 2: Protective equipment for series
capacitor banks
IEC 60270 -  High-voltage test techniques - EN 60270 -
Partial discharge measurements
IEC 60721-3-2 -  Classification of environmental conditions - EN 60721-3-2 -
Part 3: Classification of groups of
environmental parameters and their
severities -
Section 2: Transportation
IEC 62217 -  Polymeric HV insulators for indoor and EN 62217 -
outdoor use - General definitions, test
methods and acceptance criteria

Publication Year Title EN/HD Year
IEC 62271-200 2011 High-voltage switchgear and controlgear - EN 62271-200 2012
Part 200: AC metal-enclosed switchgear
and controlgear for rated voltages above
1 kV and up to and including 52 kV
IEC 62271-203 2011 High-voltage switchgear and controlgear - EN 62271-203 2012
Part 203: Gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV
IEC/TS 60071-5 2002 Insulation co-ordination - - -
Part 5: Procedures for high-voltage direct
current (HVDC) converter stations
IEC/TS 60815-2 -  Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions -
Part 2: Ceramic and glass insulators for
a.c. systems
CISPR 16-1-1 -  Specification for radio disturbance and EN 55016-1-1 -
immunity measuring apparatus and
methods -
Part 1-1: Radio disturbance and immunity
measuring apparatus - Measuring
apparatus
CISPR/TR 18-2 -  Radio interference characteristics of - -
overhead power lines and high-voltage
equipment -
Part 2: Methods of measurement and
procedure for determining limits

IEC 60099-9 ®
Edition 1.0 2014-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Surge arresters –
Part 9: Metal-oxide surge arresters without gaps for HVDC converter stations

Parafoudres –
Partie 9: Parafoudres à oxyde métallique sans éclateur pour postes de

conversion CCHT
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XD
ICS 29.120.50; 29.240.10 ISBN 978-2-8322-1644-6

– 2 – IEC 60099-9:2014 © IEC 2014
CONTENTS
FOREWORD . 7
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Typical HVDC converter station schemes, arrester types, locations and operating
voltage . 19
5 Identification and classification . 24
5.1 Arrester identification . 24
5.2 Arrester classification . 25
6 Service conditions . 25
6.1 Normal service conditions . 25
6.2 Abnormal service conditions . 25
7 Requirements . 26
7.1 Insulation withstand of the arrester housing . 26
7.2 Reference voltage . 26
7.3 Residual voltage . 26
7.4 Internal partial discharge . 27
7.5 Seal leak rate. 27
7.6 Current distribution in a multi-column arrester and between matched
arresters . 27
7.7 Long term stability under continuous operating voltage . 27
7.8 Repetitive charge transfer withstand . 27
7.9 Thermal energy capability . 27
7.10 Short-circuit performance . 28
7.11 Requirements on internal grading components . 28
7.12 Mechanical loads . 28
7.12.1 General . 28
7.12.2 Bending moment . 28
7.12.3 Resistance against environmental stresses . 28
7.12.4 Insulating base . 28
7.12.5 Mean value of breaking load (MBL). 29
7.13 Electromagnetic compatibility . 29
7.14 End of life . 29
8 General testing procedure . 29
8.1 Measuring equipment and accuracy . 29
8.2 Reference voltage measurements . 29
8.3 Test samples . 29
8.3.1 General . 29
8.3.2 Arrester section requirements . 30
9 Type tests (design tests) . 31
9.1 General . 31
9.2 Insulation withstand test on the arrester housing . 32
9.2.1 General . 32
9.2.2 Tests on individual unit housings . 32
9.2.3 Tests on complete arrester housing assemblies . 32

IEC 60099-9:2014 © IEC 2014 – 3 –
9.2.4 Ambient air conditions during tests . 32
9.2.5 Wet test procedure . 33
9.2.6 Lightning impulse voltage test . 33
9.2.7 Switching impulse voltage test . 33
9.2.8 Power-frequency voltage test. 34
9.3 Short-circuit tests . 34
9.4 Internal partial discharge tests . 35
9.5 Test of the bending moment . 36
9.5.1 Test on porcelain-housed arresters . 36
9.5.2 Test on polymer-housed arresters . 37
9.6 Environmental tests . 43
9.6.1 General . 43
9.6.2 Overview . 43
9.6.3 Sample preparation . 44
9.6.4 Test procedure . 44
9.6.5 Test evaluation . 44
9.7 Weather ageing test . 44
9.7.1 General . 44
9.7.2 Test specimens . 44
9.7.3 Test procedure . 44
9.7.4 Evaluation of the test . 45
9.8 Seal leak rate test . 46
9.8.1 General . 46
9.8.2 Overview . 46
9.8.3 Sample preparation . 46
9.8.4 Test procedure . 46
9.8.5 Test evaluation . 46
9.9 Radio interference voltage (RIV) test . 46
9.10 Residual voltage test . 48
9.10.1 General . 48
9.10.2 Steep current impulse residual voltage test . 49
9.10.3 Lightning impulse residual voltage test . 49
9.10.4 Switching impulse residual voltage test . 50
9.11 Test to verify long term stability under continuous operating voltage . 50
9.11.1 General . 50
9.11.2 Test procedure for arresters subjected to voltage reversal . 51
9.11.3 Test procedure for arresters not subjected to voltage reversal . 53
9.12 Test to verify the repetitive charge transfer rating, Q . 54
rs
9.12.1 General . 54
9.12.2 Test procedure . 55
9.12.3 Test evaluation . 55
9.12.4 Rated values of repetitive charge transfer rating, Q . 56
rs
9.13 Heat dissipation behaviour of test sample . 56
9.13.1 General . 56
9.13.2 Arrester section requirements . 56
9.13.3 Procedure to verify thermal equivalency between arrester and arrester
section . 56
9.14 Test to verify the thermal energy rating, W . 57
th
9.14.1 General . 57

– 4 – IEC 60099-9:2014 © IEC 2014
9.14.2 Arrester section requirements . 57
9.14.3 Test procedure . 57
9.15 Test to verify the dielectric withstand of internal components . 58
9.15.1 General . 58
9.15.2 Test procedure . 59
9.15.3 Test evaluation . 59
9.16 Test of internal grading components . 59
9.16.1 Test to verify long term stability under continuous operating voltage . 59
9.16.2 Thermal cyclic test . 60
10 Routine tests and acceptance test . 61
10.1 Routine tests. 61
10.2 Acceptance tests . 62
10.2.1 Standard acceptance tests . 62
10.2.2 Special thermal stability test . 62
11 Test requirements on different types of arresters . 62
11.1 General . 62
11.2 Valve arrester (V) . 62
11.2.1 General . 62
11.2.2 Continuous operating voltage . 62
11.2.3 Equivalent continuous operating voltage . 63
11.2.4 Type tests . 64
11.2.5 Routine and acceptance tests . 65
11.3 Bridge arrester and HV and LV converter unit arresters (B, CH, CL) . 65
11.3.1 Continuous operating voltage . 65
11.3.2 Equivalent continuous operating voltage . 66
11.3.3 Type tests . 66
11.3.4 Routine and acceptance tests . 66
11.4 Converter unit arrester (C) . 66
11.4.1 General . 66
11.4.2 Continuous operating voltage . 66
11.4.3 Equivalent continuous operating voltage . 66
11.4.4 Type tests . 67
11.4.5 Routine and acceptance tests . 67
11.5 Mid-point d.c. bus arrester, mid-point bridge arresters and arrester between
converters (M, MH, ML, CM) . 67
11.5.1 Continuous operating voltage . 67
11.5.2 Equivalent continuous operating voltage . 67
11.5.3 Type tests . 68
11.5.4 Routine and acceptance tests . 68
11.6 Converter unit d.c. bus arrester (CB). 68
11.6.1 Continuous operating voltage . 68
11.6.2 Equivalent continuous operating voltage . 68
11.6.3 Type tests . 69
11.6.4 Routine and acceptance tests . 69
11.7 DC bus and d.c. line/cable arrester (DB, DL/DC) . 69
11.7.1 General . 69
11.7.2 Continuous operating voltage . 69
11.7.3 Equivalent continuous operating voltage . 69
11.7.4 Type tests . 69

IEC 60099-9:2014 © IEC 2014 – 5 –
11.7.5 Routine and acceptance tests . 70
11.8 Neutral bus arresters (EB, E1, E) . 71
11.8.1 Continuous operating voltage . 71
11.8.2 Equivalent continuous operating voltage . 71
11.8.3 Type tests . 71
11.8.4 Routine and acceptance tests . 72
11.9 DC and AC filter arresters (FA, FD). 72
11.9.1 Continuous operating voltage . 72
11.9.2 Equivalent continuous operating voltage . 72
11.9.3 Type tests . 74
11.9.4 Routine and acceptance tests . 74
11.10 Electrode line and metallic return arresters (EL, EM) . 74
11.10.1 Continuous operating voltage . 74
11.10.2 Equivalent continuous operating voltage . 74
11.10.3 Type tests . 74
11.10.4 Routine and acceptance tests . 74
11.11 Smoothing reactor arrester (DR) . 74
11.11.1 General . 74
11.11.2 Continuous operating voltage . 74
11.11.3 Equivalent continuous operating voltage . 74
11.11.4 Type tests . 74
11.11.5 Routine and acceptance tests . 74
11.12 Capacitor arrester (CC) . 75
11.12.1 General . 75
11.12.2 Continuous operating voltage . 75
11.12.3 Equivalent continuous operating voltage . 75
11.12.4 Type tests . 75
11.12.5 Routine and acceptance tests . 75
11.13 Transformer valve winding arrester (T). 75
11.13.1 General . 75
11.13.2 Continuous operating voltage . 76
11.13.3 Equivalent continuous operating voltage . 76
11.13.4 Type tests . 76
11.13.5 Routine and acceptance tests . 76
Annex A (normative) Test to verify thermal equivalency between complete arrester
and arrester section . 77
Annex B (normative) Determination of the start temperature in the thermal recovery
test . 79
Annex C (normative) Mechanical considerations . 80
C.1 Test of bending moment. 80
C.2 Seismic test . 81
C.3 Definition of mechanical loads . 81
C.4 Definition of seal leak rate . 83
C.5 Calculation of wind-bending-moment. 83
C.6 Procedures of tests of bending moment for porcelain and polymer-housed
arresters . 84
Annex D (informative) Different circuit configurations . 86
Bibliography . 88

– 6 – IEC 60099-9:2014 © IEC 2014
Figure 1 – Single line diagram of typical converter station with two 12-pulse converter
bridges per pole . 20
Figure 2 – Single line diagram of typical converter station with one 12-pulse converter
bridge per pole. 21
Figure 3 – Single line diagram of typical capacitor commutated converter (CCC) pole
with two 12-pulse converters in series. 22
Figure 4 – Typical continuous operating voltages for different arresters – low-
frequency modelling (location as per Figures 1 to 3, fundamental frequency 50 Hz) . 23
Figure 5 – Typical continuous operating voltages for different arresters – high-
frequency modelling (location as per Figures 1 to 3, fundamental frequency 50 Hz) . 24
Figure 6 – Thermomechanical test . 40
Figure 7 – Example of the test arrangement for the thermomechanical test and
direction of the cantilever load . 41
Figure 8 – Water immersion . 42
Figure 9 – Test cycle for accelerated ageing test with polarity reversals, method a) . 52
Figure 10 – Operating voltage of a valve arrester (V) (rectifier operation) and definition
of PCOV and CCOV . 63
Figure 11 – Operating voltage of a bridge arrester and definition of DCOV, PCOV and
CCOV . 65
Figure 12 – Plot showing the relative duration of voltage above certain amplitudes . 73
Figure C.1 – Bending moment – multi-unit surge arrester . 80
Figure C.2 – Definitions of mechanical loads . 82
Figure C.3 – Surge arrester unit . 83
Figure C.4 – Surge-arrester dimensions . 84
Figure C.5 – Flow chart of bending moment test procedures . 85
Figure D.1 – Single line diagram of CSCC converter station with two 12-pulse
converters in series . 86
Figure D.2 – Single line diagram of back-to-back converter station with two 12-pulse
converters in series . 87

Table 1 – Summary of type tests – 1 . 64
Table 2 – Summary of type tests – 2 . 71

IEC 60099-9:2014 © IEC 2014 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SURGE ARRESTERS –
Part 9: Metal-oxide surge arresters without
gaps for HVDC converter stations

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of 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, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). 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. 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 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 IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard 60099-9 has been prepared by IEC technical committee 37: Surge
arresters.
The text of this standard is based on the following documents:
FDIS Report on voting
37/417/FDIS 37/422/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.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

– 8 – IEC 60099-9:2014 © IEC 2014
A list of all parts in the IEC 60099 series, published under the general title Surge arresters,
can be found on the IEC website.
The committee has decided that the contents of this 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
his document using a
understanding of its contents. Users should therefore print t
colour printer.
IEC 60099-9:2014 © IEC 2014 – 9 –
SURGE ARRESTERS –
Part 9: Metal-oxide surge arresters without
gaps for HVDC converter stations

1 Scope
This part of IEC 60099 applies to non-linear metal-oxide resistor type surge arresters without
spark gaps designed to limit overvoltages in HVDC converter stations of two terminal,
multiterminal and back-to-back type up to and including an operating voltage of 1 100 kV. The
standard applies in general to porcelain-housed and polymer-housed type arresters but also
to gas-insulated metal enclosed arresters (GIS-arresters) solely used as d.c. bus and d.c.
line/cable arresters. Arresters for voltage source converters are not covered. Arresters
applied on the a.c. systems at the converter station and subjected to power-frequency voltage
of 50 or 60 Hz principally without harmonics are tested as per IEC 60099-4. The arresters on
a.c.-filters are tested according to this standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements
IEC 60060-2, High-voltage test techniques – Part 2: Measuring systems
IEC 60068-2-11:1981, Environmental testing – Part 2: Tests. Test Ka: Salt mist
IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature
IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing
IEC 60071-2:1996, Insulation co-ordination – Part 2: Application guide
IEC TS 60071-5:2002, Insulation co-ordination – Part 5: Procedures for high-voltage direct
current (HVDC) converter stations
IEC 60099-4:2004, Surge arresters – Part 4: Metal-oxide surge arresters without gaps for a.c.
systems
IEC 60143-2, Series capacitors for power systems – Part 2: Protective equipment for series
capacitor banks
IEC 60270, High-voltage test techniques – Partial discharge measurements
IEC 60721-3-2, Classification of environmental conditions – Part 3: Classification of groups of
environmental parameters and their severities – Section 2: Transportation
IEC TS 60815-2, Selection and dimensioning of high-voltage insulators intended for use in
polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems

– 10 – IEC 60099-9:2014 © IEC 2014
IEC 62217, Polymeric HV insulators for indoor and outdoor use – General definitions, test
methods and acceptance criteria
IEC 62271-200:2011, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
IEC 62271-203:2011, High-voltage switchgear and controlgear – Part 203: Gas-insulated
metal-enclosed switchgear for rated voltages above 52 kV
CISPR 16-1-1, Specification for radio disturbance and immunity measuring apparatus and
methods – Part 1-1: Radio disturbance and immunity measuring apparatus – Measuring
apparatus
CISPR/TR 18-2, Radio interference characteristics of overhead power lines and high-voltage
equipment – Part 2: Methods of measurement and procedure for determining limits
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
acceptance tests
tests made on arresters or representative samples after agreement between manufacturer
and user
3.2
bending moment
force perpendicular to the longitudinal axis of an arrester multiplied by the vertical distance
between the mounting base (lower level of the flange) of the arrester and the point of
application of the force
3.3
breaking load
force perpendicular to the longitudinal axis of a porcelain-housed arrester leading to
mechanical failure of the arrester housing
3.4
continuous current of an arrester
current flowing through the arrester when energized at the continuous operating voltage
Note 1 to entry: The continuous current, which consists of a resistive and a capacitive component, may vary with
temperature, stray capacitance and external pollution effects. The continuous current of a test sample may,
therefore, not be the same as the continuous current of a complete arrester.
Note 2 to entry: The continuous current is, for comparison purposes, expressed either by its r.m.s. or peak value.
3.5
continuous operating voltage of an HVDC-arrester
U
cHVDC
maximum continuous voltage characterized by the voltages CCOV, PCOV and DCOV and the
frequency DFCOV where applicable and that may be applied continuously between the
arrester terminals
3.6
coordination current of an arrester
for a given system under study and for each class of overvoltage, the current through the
arrester for which the representative overvoltage is determined
...