SIST EN IEC 60099-8:2018

Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV

This part of IEC 60099 covers metal-oxide surge arresters with external series gap (externally
gapped line arresters (EGLA)) that are applied on overhead transmission and distribution
lines, only to protect insulator assemblies from lightning-caused flashovers.
This document defines surge arresters to protect the insulator assembly from lightning-caused
over-voltages only. Therefore, and since metal-oxide resistors are not permanently connected
to the line, the following items are not considered for this document:
• switching impulse spark-over voltage;
• residual voltage at steep current and switching current impulse;
• thermal stability;
• long-duration current impulse withstand duty;
• power-frequency voltage versus time characteristics of an arrester;
• disconnector test;
• aging duties by power-frequency voltage.
Considering the particular design concept and the special application on overhead
transmission and distribution lines, some unique requirements and tests are introduced, such
as the verification test for coordination between insulator withstand and EGLA protective
level, the follow current interrupting test, mechanical load tests, etc.
Designs with the EGLA's external series gap installed in parallel to an insulator are not
covered by this document.

Überspannungsableiter - Teil 8: Metalloxid-Überspannungsableiter mit externer Serienfunkenstrecke (EGLA) für Übertragungs- und Verteilungsleitungen von Wechselstromsystemen über 1 kV

Parafoudres - Partie 8: Parafoudres à oxyde métallique avec éclateur extérieur en série (EGLA) pour lignes aériennes de transmission et de distribution de réseaux à courant alternatif de plus de 1 kV

NEW!IEC 60099-8:2017 est disponible sous forme de IEC 60099-8:2017 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

Prenapetostni odvodniki - 8. del: Kovinskooksidni prenapetostni odvodniki z zunanjim zaporedno vezanim iskriščem (EGLA) za nadzemne prenosne in razdelilne vode v izmeničnih sistemih nad 1 kV

V tem delu standarda IEC 60099 so obravnavani prenapetostni odvodniki iz kovinskega oksida z zunanjim iskriščem skupinske strukture (linijski odvodniki z zunanjim iskriščem (EGLA)), ki se uporabljajo za nadzemni prenos in razdelilna omrežja, in sicer z izključnim namenom zaščite izolacijskih sklopov pred prebojnim vžigom zaradi delovanja strele.
V tem dokumentu so opredeljeni prenapetostni odvodniki samo zaradi zaščite izolacijskega sklopa pred prenapetostjo, ki jo povzroči udar strele. Zaradi tega in ker upori iz kovinskega oksida niso trajno priključeni na vod, naslednji elementi niso upoštevani za ta dokument:
• vžigna napetost pri stikalnem napetostnem udaru,
• preostala napetost pri strmem tokovnem impulzu in preklopnem tokovnem impulzu,
• toplotna stabilnost,
• odpornosti proti dolgotrajnemu tokovnemu impulzu,
• električne napetosti v odvisnosti od časa trajanja prenapetostnega odvodnika,
• preskusa prekinjal,
• vpliva električne napetosti na delovanje pri staranju.
Ob upoštevanju posebnega koncepta projektiranja in posebne uporabe pri omrežjih za nadzemni prenos in razdelilnih omrežjih so predstavljene nekatere edinstvene zahteve in preskusi, kot je preverjalni preskus za namen usklajevanja med odpornostjo izolatorjev in zaščitno ravnjo EGLA, prekinjevalni preskus sledilnega toka, preskusi z mehansko obremenitvijo itd.
Zasnove z nameščenim zunanjim iskriščem skupinske strukture EGLA vzporedno z izolatorjem niso obravnavane v tem dokumentu.

General Information

• Status: Published
• Publication Date: 16-Apr-2018
• ICS: 29.240.10 - Substations. Surge arresters
• Technical Committee: POD - Surge aresters
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 16-Mar-2018
• Due Date: 21-May-2018
• Completion Date: 17-Apr-2018
• Ref Project: EN IEC 60099-8:2018 - Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV

Relations

• Replaces: SIST EN 60099-8:2011 - Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV
• Effective Date: 01-May-2018
• Replaces: SIST EN 60099-8:2011 - Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead transmission and distribution lines of a.c. systems above 1 kV
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60099-8:2018
01-maj-2018
1DGRPHãþD
SIST EN 60099-8:2011
3UHQDSHWRVWQLRGYRGQLNLGHO.RYLQVNRRNVLGQLSUHQDSHWRVWQLRGYRGQLNL]
]XQDQMLP]DSRUHGQRYH]DQLPLVNULãþHP(*/$]DQDG]HPQHSUHQRVQHLQ
UD]GHOLOQHYRGHYL]PHQLþQLKVLVWHPLKQDGN9
Surge arresters - Part 8: Metal-oxide surge arresters with external series gap (EGLA) for
overhead transmission and distribution lines of a.c. systems above 1 kV
Überspannungsableiter - Teil 8: Metalloxid-Überspannungsableiter mit externer
Serienfunkenstrecke (EGLA) für Übertragungs- und Verteilungsleitungen von
Wechselstromsystemen über 1 kV
Parafoudres - Partie 8: Parafoudres à oxyde métallique avec éclateur extérieur en série
(EGLA) pour lignes aériennes de transmission et de distribution de réseaux à courant
alternatif de plus de 1 kV
Ta slovenski standard je istoveten z: EN IEC 60099-8:2018
ICS:
29.240.10 Transformatorske postaje. Substations. Surge arresters
Prenapetostni odvodniki
SIST EN IEC 60099-8:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60099-8:2018

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SIST EN IEC 60099-8:2018


EUROPEAN STANDARD EN IEC 60099-8

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2018
ICS 29.240.10 Supersedes EN 60099-8:2011
English Version
Surge arresters - Part 8: Metal-oxide surge arresters with
external series gap (EGLA) for overhead transmission and
distribution lines of a.c. systems above 1 kV
(IEC 60099-8:2017)
Parafoudres - Partie 8: Parafoudres à oxyde métallique Überspannungsableiter - Teil 8: Metalloxid-
avec éclateur extérieur en série (EGLA) pour lignes Überspannungsableiter mit externer Serienfunkenstrecke
aériennes de transmission et de distribution de réseaux à (EGLA) für Übertragungs- und Verteilungsleitungen von
courant alternatif de plus de 1 kV Wechselstromsystemen über 1 kV
(IEC 60099-8:2017) (IEC 60099-8:2017)
This European Standard was approved by CENELEC on 2017-12-19. 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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60099-8:2018 E

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SIST EN IEC 60099-8:2018
EN IEC 60099-8:2018 (E)

European foreword
The text of document 37/436/FDIS, future edition 2 of IEC 60099-8, prepared by IEC/TC 37 "Surge
arresters" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60099-8:2018.

The following dates are fixed:
• latest date by which the document has to be (dop) 2018-09-19
implemented at national level by
publication of an identical national
standard or by endorsement
(dow) 2020-12-19
• latest date by which the national
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60099-8:2011.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 60099-8:2017 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated :

ISO 3274 NOTE Harmonized as EN ISO 3274.

2

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SIST EN IEC 60099-8:2018
EN IEC 60099-8:2018 (E)

Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.

NOTE 1  Where 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 2010 High-voltage test techniques -- Part 1: EN 60060-1 2010
General definitions and test requirements
IEC 60060-2 2010 High-voltage test techniques -- Part 2: EN 60060-2 2011
Measuring systems
IEC 60068-2-11 1981 Basic environmental testing procedures - EN 60068-2-11 1999
Part 2-11: Tests - Test Ka: Salt mist
IEC 60068-2-14 2009 Environmental testing -- Part 2-14: Tests - EN 60068-2-14 2009
Test N: Change of temperature
IEC 60099-4 2014 Surge arresters - Part 4: Metal-oxide surge EN 60099-4 2014
arresters without gaps for a.c. systems
IEC 60270 2000 High-voltage test techniques - Partial EN 60270 2001
discharge measurements
IEC 60507 2013 Artificial pollution tests on high-voltage EN 60507 2014
ceramic and glass insulators to be used on
a.c. systems
IEC 62217 2012 Polymeric HV insulators for indoor and EN 62217 2013
outdoor use - General definitions, test
methods and acceptance criteria
IEC/TS 60815-1 2008 Selection and dimensioning of high-voltage - -
insulators intended for use in polluted
conditions - Part 1: Definitions, information
and general principles
ISO 4287 -  Geometrical Product Specifications (GPS) EN ISO 4287 -
- Surface texture: Profile method - Terms,
definitions and surface texture parameters
ISO 4892-1 -  EN ISO 4892-1 -
ISO 4892-2 -  Plastics - Methods of exposure to EN ISO 4892-2 -
laboratory light sources - Part 2: Xenon-arc
lamps
ISO 4892-3 -  EN ISO 4892-3 -


3

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SIST EN IEC 60099-8:2018

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SIST EN IEC 60099-8:2018




IEC 60099-8

®


Edition 2.0 2017-11




INTERNATIONAL



STANDARD








colour

inside










Surge arresters –

Part 8: Metal-oxide surge arresters with external series gap (EGLA) for overhead

transmission and distribution lines of a.c. systems above 1 kV

























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 29.240.10 ISBN 978-2-8322-4987-1



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 60099-8:2018
– 2 – IEC 60099-8:2017 © IEC 2017
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Identification and classification . 13
4.1 EGLA identification . 13
4.2 EGLA classification . 13
5 Standard ratings and service conditions . 14
5.1 Standard rated voltages . 14
5.2 Standard rated frequencies . 14
5.3 Standard nominal discharge currents . 14
5.4 Service conditions . 14
5.4.1 Normal service conditions . 14
5.4.2 Special service conditions . 14
6 Requirements . 15
6.1 Insulation withstand of the SVU and the complete EGLA . 15
6.1.1 Insulation withstand of the housing of the SVU . 15
6.1.2 Insulation withstand of EGLA with shorted (failed) SVU . 15
6.2 Residual voltages . 15
6.3 High current duty . 15
6.4 Lightning discharge capability . 15
6.5 Short-circuit performance of the SVU . 15
6.6 Mechanical performance . 16
6.7 Weather aging of SVU . 16
6.8 Reference voltage of the SVU . 16
6.9 Internal partial discharges . 16
6.10 Coordination between insulator withstand and EGLA protective level . 16
6.11 Follow current interrupting . 17
6.12 Electromagnetic compatibility . 17
6.13 End of life . 17
7 General testing procedure . 17
7.1 Measuring equipment and uncertainty . 17
7.2 Test samples . 17
8 Type tests . 18
8.1 General . 18
8.2 Insulation withstand tests on the SVU housing and on the EGLA with failed
SVU . 18
8.2.1 General . 18
8.2.2 Insulation withstand test on the SVU housing . 19
8.2.3 Insulation withstand tests on EGLA with failed SVU . 19
8.3 Residual voltage tests . 20
8.3.1 General . 20
8.3.2 Procedure for correction and calculation of inductive voltages . 20
8.3.3 Lightning current impulse residual voltage test . 21

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SIST EN IEC 60099-8:2018
IEC 60099-8:2017 © IEC 2017 – 3 –
8.3.4 High current impulse residual voltage test . 22
8.4 Standard lightning impulse sparkover test . 22
8.5 High current impulse withstand test. 23
8.5.1 Selection of test samples . 23
8.5.2 Test procedure . 23
8.5.3 Test evaluation . 24
8.6 Test to verify the repetitive charge transfer rating, Q with lightning
rs
discharges . 24
8.6.1 MO resistors . 24
8.6.2 Series gap . 26
8.7 Short-circuit tests . 27
8.7.1 General . 27
8.7.2 Preparation of the test samples . 28
8.7.3 Mounting of the test sample . 29
8.7.4 High-current short-circuit tests . 30
8.7.5 Low-current short-circuit test . 32
8.7.6 Evaluation of test results . 32
8.8 Follow current interrupting test . 38
8.8.1 General . 38
8.8.2 "Test method A" . 38
8.8.3 "Test method B" . 40
8.9 Mechanical load tests on the SVU . 42
8.9.1 General . 42
8.9.2 Bending test . 42
8.9.3 Vibration test . 51
8.10 Weather aging tests . 52
8.10.1 General . 52
8.10.2 Sample preparation . 52
8.10.3 Test procedure . 52
8.10.4 Test evaluation . 52
8.10.5 Additional test procedure for polymer (composite and cast resin)
housed SVUs . 53
8.11 Radio interference voltage (RIV) test . 53
9 Routine tests . 53
9.1 General . 53
10 Acceptance tests . 54
10.1 General . 54
10.2 Reference voltage measurement of SVU . 54
10.3 Internal partial discharge test of SVU . 55
10.4 Radio interference voltage (RIV) test . 55
10.5 Test for coordination between insulator withstand and EGLA protective level . 55
10.5.1 General . 55
10.5.2 Steep front impulse test . 55
10.5.3 Standard lightning impulse sparkover test . 56
10.6 Follow current interrupting test . 56
10.6.1 General . 56
10.6.2 Test procedure . 57
10.6.3 Test sequence . 57
10.6.4 Test evaluation . 57

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SIST EN IEC 60099-8:2018
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10.7 Vibration test on the SVU with attached electrode . 57
10.7.1 General . 57
10.7.2 Sample preparation . 57
10.7.3 Test procedure and test condition . 57
10.7.4 Test evaluation . 58
Annex A (informative) Example of a test circuit for the follow current interrupting test . 59
Annex B (normative) Mechanical considerations . 60
B.1 Test of bending moment. 60
B.2 Definition of mechanical loads . 61
B.3 Definition of seal leak rate . 62
B.4 Calculation of wind-bending-moment. 63
B.5 Flow chart – Procedures of tests of bending moment for porcelain/cast resin
and polymer-housed SVUs . 64
Annex C (normative) Special service conditions . 65
C.1 General . 65
C.2 Temperature in excess of +40 °C or below –40 °C . 65
C.3 Application at altitudes higher than 1 000 m . 65
C.4 Fumes or vapours that may cause deterioration of insulating surface or
mounting hardware . 65
C.5 Excessive contamination by smoke, dirt, salt spray or other conducting
materials . 65
C.6 Excessive exposure to moisture, humidity, dripping water, or steam . 65
C.7 Live washing of arrester . 65
C.8 Unusual transportation or storage . 65
C.9 Non-vertical erection and suspended erection . 66
C.10 Wind speed > 34 m/s . 66
C.11 Earthquake . 66
C.12 Torsional loading of the arrester . 66
Bibliography . 67

Figure 1 – Configuration of an EGLA with insulator and arcing horn . 8
Figure 2 – Test procedure to verify the repetitive charge transfer rating, Q . 25
rs
Figure 3 – Test procedure to verify the repetitive charge withstand of the series gap . 27
Figure 4 – Examples of SVU units . 36
Figure 5 – Short-circuit test setup . 37
Figure 6 – Example of a test circuit for re-applying pre-failing circuit immediately
before applying the short-circuit test current . 38
Figure 7 – Thermo-mechanical test . 46
Figure 8 – Example of the test arrangement for the thermo-mechanical test and
direction of the cantilever load . 47
Figure 9 – Test sequence of the water immersion test . 48
Figure A.1 – Example of a test circuit for the follow current interrupting test . 59
Figure B.1 – Bending moment – Multi-unit SVU. 60
Figure B.2 – Definition of mechanical loads . 61
Figure B.3 – SVU unit . 62
Figure B.4 – SVU dimensions . 63

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SIST EN IEC 60099-8:2018
IEC 60099-8:2017 © IEC 2017 – 5 –
Figure B.5 – Procedures of tests of bending moment for porcelain/cast resin and
polymer-housed SVUs . 64

Table 1 – EGLA classification – “Series X” and “Series Y“ . 13
Table 2 – Steps of rated voltages (r.m.s. values) . 14
Table 3 – Type tests (all tests to be performed with or without insulator assembly; by
manufacturer's decision) . 18
Table 4 – Test requirements . 34
Table 5 – Required currents for short-circuit tests . 35
Table 6 – Acceptance tests . 54
Table 7 – Virtual steepness of wave front of steep front impulses . 55

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SIST EN IEC 60099-8:2018
– 6 – IEC 60099-8:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

SURGE ARRESTERS –

Part 8: Metal-oxide surge arresters with external series gap (EGLA)
for overhead transmission and distribution lines
of a.c. systems above 1 kV

FOREWORD
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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 IEC 60099-8 has been prepared by IEC technical committee 37: Surge
arresters.
This second edition cancels and replaces the first edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) The Lightning discharge capability test has been completely re-written and re-named to
Test to verify the repetitive charge transfer rating, Qrs with lightning disc
...