Insulation co-ordination - Part 2: Application guidelines

IEC 60071-2:2023 is available as IEC 60071-2:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60071-2:2023 constitutes application guidelines and deals with the selection of insulation levels of equipment or installations for three-phase AC systems. Its aim is to give guidance for the determination of the rated withstand voltages for ranges I and II of IEC 60071‑1 and to justify the association of these rated values with the standardized highest voltages for equipment. This association is for insulation co-ordination purposes only. The requirements for human safety are not covered by this document. This document covers three-phase AC systems with nominal voltages above 1 kV, phase-to-earth, phase-to-phase and longitudinal insulation. It has the status of a horizontal standard in accordance with IEC Guide 108. This edition includes the following significant technical changes with respect to the previous edition:
a) Clause 4 Concepts governing the insulation co-ordination has been added.
b) Subclause 5.3 has been revised, and Subclause 5.4 Detailed simulation has been added because it is widely applied in the recent practices of insulation coordination.
c) Special considerations for cable line and GIL/GIB have been added in Clause 9.
d) Annex K (informative) Application of line shunt reactor to limitation of TOV and SFO in high voltage overhead transmission lines has been added.
e) Annex L (informative) Calculation of lightning stroke rate and lightning outage rate has been added.

Coordination de l'isolement - Partie 2: Lignes directrices en matière d'application

IEC 60071-2:2023 est disponible sous forme de IEC 60071-2:2023 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60071-2:2023 constitue des lignes directrices en matière d'application et concerne le choix des niveaux d'isolement des matériels ou des installations pour les réseaux triphasés en courant alternatif. Elle a pour objet de donner des recommandations pour la détermination des tensions de tenue assignées pour les plages I et II de l'IEC 60071-1 et de justifier l'association de ces valeurs assignées avec les valeurs normalisées des tensions les plus élevées pour le matériel. Cette association ne couvre que les besoins de la coordination de l'isolement. Les exigences relatives à la sécurité des personnes ne sont pas traitées dans le présent document. Le présent document traite des réseaux triphasés en courant alternatif de tension nominale supérieure à 1 kV. Le présent document traite de l'isolement phase-terre, entre phases et longitudinal. Le présent document a le statut d'une norme horizontale conformément au Guide 108 de l'IEC. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) l'Article 4, Concepts applicables à la coordination de l'isolement, a été ajouté;
lb) e 5.3 a été révisé et le 5.4, Simulation détaillée, a été ajouté, car la simulation est largement appliquée dans les récentes pratiques de coordination de l'isolement;
c) des points particuliers ont été ajoutés pour les câbles et pour les lignes de transport/barres blindées à isolation gazeuse à l'Article 9;
d) l'Annexe K (informative), Application d'une inductance shunt pour la limitation des TOV et des SFO dans les lignes de transport aériennes à haute tension, a été ajoutée;
e) l'Annexe L (informative), Calcul du taux de foudroiement et du taux de coupure due à la foudre, a été ajoutée.

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IEC 60071-2

Edition 5.0 2023-05


Insulation co-ordination –
Part 2: Application guidelines

IEC 60071-2:2023-05 RLV(en)

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IEC 60071-2

Edition 5.0 2023-05
Insulation co-ordination –
Part 2: Application guidelines
ICS 29.080.30 ISBN 978-2-8322-7074-5

 Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC 60071-2:2023 RLV © IEC 2023
1 Scope . 11
2 Normative references . 11
3 Terms, definitions, abbreviated terms and symbols . 12
3.1 Terms and definitions . 12
3.2 Abbreviated terms . 12
3.3 Symbols . 12
4 Concepts governing the insulation co-ordination . 18
5 Representative voltage stresses in service . 19
5.1 Origin and classification of voltage stresses . 19
5.2 Characteristics of overvoltage protection devices . 20
5.2.1 General remarks . 20
5.2.2 Metal-oxide surge arresters without gaps (MOSA) . 20
5.2.3 Line surge arresters (LSA) for overhead transmission and distribution
lines .

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