IEC 60099-8:2017
(Main)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
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 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. 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:
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 discharges to reflect changes introduced in IEC 60099-4 Ed.3 (2014) regarding new methods for rating the energy and charge handling capability of metal-oxide arresters. In addition to testing to evaluate the performance of the MO resistors, procedures for evaluating the performance of the EGLA series gaps have been introduced.
- Omissions from Ed. 1 of this standard have been included, notably an RIV test and a means for determining the thermal time constant of the SUV portion of the EGLA.
- Definitions for new terms have been added
- A number of NOTES in Ed. 1 have been converted to normative requirements
Keywords: externally gapped line arresters (EGLA), lightning-caused over-voltages
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
IEC 60099-8:2017 concerne les parafoudres à oxyde métallique avec éclateur extérieur en série (parafoudres de ligne avec éclateur extérieur) utilisés sur les lignes aériennes de transmission et de distribution, uniquement pour protéger les ensembles isolateurs contre les contournements provoqués par la foudre. Le présent document définit des parafoudres destinés à protéger l'ensemble isolateur uniquement contre les surtensions provoquées par la foudre. Par conséquent, et sachant que les résistances à oxyde métallique ne sont pas connectées en permanence à la ligne, les éléments suivants ne sont pas pris en compte dans le présent document:
• la tension d'amorçage au choc de manœuvre;
• la tension résiduelle au choc de courant à front raide et au choc de courant de manœuvre;
• la stabilité thermique;
• la tenue au choc de courant de longue durée en fonctionnement;
• la caractéristique de tension à fréquence industrielle en fonction du temps, d'un parafoudre;
• les essais portant sur les dispositifs de déconnexion;
• le fonctionnement et le vieillissement sous tension à fréquence industrielle.
Compte tenu de la conception particulière et du caractère unique de l'application aux lignes aériennes de transmission et de distribution, certaines exigences et certains essais spécifiques ont été introduits, tels que l'essai de vérification de la coordination entre la tenue de l'isolateur et le niveau de protection de l'EGLA, l'essai de coupure du courant de suite, les essais d'efforts mécaniques, etc. Les conceptions avec des EGLA à éclateur extérieur en série montés en parallèle sur un isolateur ne sont pas couvertes par le présent document. Cette deuxième édition annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) L’essai de la capacité de décharge aux chocs de foudre a été complètement reformulé et renommé en «Essai de vérification des caractéristiques assignées de transfert de charges répétitives, Qrs, avec décharges de foudre» pour refléter les modifications apportées à l’IEC 60099-4 Éd. 3 (2014) concernant les nouvelles méthodes de classification de la capacité à supporter une énergie ou une charge des parafoudres à oxyde métallique. En plus des essais permettant d’évaluer les performances des résistances MO, des procédures permettant d’évaluer les performances des éclateurs en série des EGLA ont été introduites.
b) Les omissions de l’Éd. 1 de la présente norme ont été rétablies, en particulier un essai aux tensions perturbatrices RF et un moyen de déterminer la constante de temps thermique du bloc de varistances en série de l’EGLA.
c) De nouveaux termes et définitions ont été ajoutés.
d) Un certain nombre de NOTES de l’Éd. 1 ont été converties en exigences normatives.
Mots clés: parafoudres de ligne avec éclateur extérieur, surtensions provoquées par la foudre
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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
IEC 60099-8 :2017-11(en)
All rights reserved. Unless otherwise specified, 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
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
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latest edition, a corrigenda or an amendment might have been published.
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and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
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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
– 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
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 .
...
IEC 60099-8 ®
Edition 2.0 2017-11
REDLINE VERSION
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
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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Centre: csc@iec.ch.
IEC 60099-8 ®
Edition 2.0 2017-11
REDLINE VERSION
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 978-2-8322-5076-1
– 2 – IEC 60099-8:2017 RLV © 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 Abnormal Special service conditions . 15
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 . 16
6.4 Lightning discharge capability . 16
6.5 Short-circuit performance of the SVU . 16
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 . 17
6.10 Coordination between insulator withstand and EGLA protective level . 17
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 accuracy uncertainty . 17
7.2 Test samples . 18
8 Type tests . 18
8.1 General . 18
8.2 Insulation withstand tests on the SVU housing and on the EGLA with failed
SVU . 19
8.2.1 General . 19
8.2.2 Insulation withstand test on the SVU housing . 19
8.2.3 Insulation withstand tests on EGLA with failed SVU . 20
8.3 Residual voltage tests . 21
8.3.1 General . 21
8.3.2 Procedure for correction and calculation of inductive voltages . 21
8.3.3 Lightning current impulse residual voltage test . 22
8.3.4 High current impulse residual voltage test . 23
8.4 Standard lightning impulse sparkover test . 23
8.5 High current impulse withstand test. 24
8.5.1 Selection of test samples . 24
8.5.2 Test procedure . 24
8.5.3 Test evaluation . 25
8.6 Test to verify the repetitive charge transfer rating, Q with lightning
rs
discharges capability test . 25
8.6.1 MO resistors . 25
8.6.2 Series gap . 28
8.6.3 Test parameters for the lightning impulse discharge capability test .
8.6.4 Measurements during the lightning impulse discharge capability test .
8.6.5 Rated lightning impulse discharge capability .
8.7 Short-circuit tests . 29
8.7.1 General . 29
8.7.2 Preparation of the test samples . 30
8.7.3 Mounting of the test sample . 31
8.7.4 High-current short-circuit tests . 32
8.7.5 Low-current short-circuit test . 34
8.7.6 Evaluation of test results . 34
8.8 Follow current interrupting test . 40
8.8.1 General . 40
8.8.2 "Test method A" . 40
8.8.3 "Test method B" . 42
8.9 Mechanical load tests on the SVU . 44
8.9.1 General . 44
8.9.2 Bending test . 44
8.9.3 Vibration test . 52
8.10 Weather aging tests . 54
8.10.1 General . 54
8.10.2 Sample preparation . 54
8.10.3 Test procedure . 54
8.10.4 Test evaluation . 55
8.10.5 Additional test procedure for polymer (composite and cast resin)
housed SVUs . 55
8.11 Radio interference voltage (RIV) test . 55
9 Routine tests . 56
9.1 General . 56
10 Acceptance tests . 56
10.1 General . 56
10.2 Reference voltage measurement of SVU . 57
10.3 Internal partial discharge test of SVU . 57
10.4 Radio interference voltage (RIV) test . 57
10.5 Test for coordination between insulator withstand and EGLA protective level . 57
10.5.1 General . 57
10.5.2 Front-of-wave Steep front impulse spark-over test . 58
10.5.3 Standard lightning impulse sparkover test . 58
10.6 Follow current interrupting test . 59
10.6.1 General .
...
IEC 60099-8 ®
Edition 2.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
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
All rights reserved. Unless otherwise specified, 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
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Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
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The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60099-8 ®
Edition 2.0 2017-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.240.10 ISBN 978-2-8322-6106-4
– 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
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" .
...
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