• IEC 60071-2:2018

    Current The latest, up-to-date edition.

    Insulation co-ordination - Part 2: Application guidelines

    Available format(s):  Hardcopy, PDF, PDF 3 Users, PDF 5 Users, PDF 9 Users

    Language(s):  English - French, Spanish, Castilian

    Published date:  16-03-2018

    Publisher:  International Electrotechnical Committee

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    Table of Contents - (Show below) - (Hide below)

    FOREWORD
    1 Scope
    2 Normative references
    3 Terms, definitions, abbreviated terms and symbols
    4 Representative voltage stresses in service
    5 Co-ordination withstand voltage
    6 Required withstand voltage
    7 Standard withstand voltage and testing procedures
    8 Special considerations for overhead lines
    9 Special considerations for substations
    Annex A (informative) - Determination of temporary
            overvoltages due to earth faults
    Annex B (informative) - Weibull probability distributions
    Annex C (informative) - Determination of the representative
            slow-front overvoltage due to line energization and
            re-energization
    Annex D (informative) - Transferred overvoltages in
            transformers
    Annex E (informative) - Lightning overvoltages
    Annex F (informative) - Calculation of air gap breakdown
            strength from experimental data
    Annex G (informative) - Examples of insulation co-ordination
            procedure
    Annex H (informative) - Atmospheric correction - Altitude
            correction
    Annex I (informative) - Evaluation method of non-standard
            lightning overvoltage shape for representative
            voltages and overvoltages
    Annex J (informative) - Insulation co-ordination for
            very-fast-front overvoltages in UHV substations
    Bibliography

    Abstract - (Show below) - (Hide below)

    IEC 60071-2:2018 is now available as IEC 60071-2:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
    IEC 60071-2:2018 constitutes application guidelines and deals with the selection of insulation levels of equipment or installations for three-phase electrical systems. It gives 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. It covers three-phase systems with nominal voltages above 1 kV. This edition includes the following significant technical changes with respect to the previous edition:

    a) the annex on clearance in air to assure a specified impulse withstand voltage installation is deleted because the annex in IEC 60071-1 is overlapped;

    b) 4.2 and 4.3 on surge arresters are updated;

    c) 4.3.5 on very-fast-front overvoltages is revised. Annex J on insulation co-ordination for very-fast-front overvoltages in UHV substations is added;

    d) Annex H on atmospheric correction altitude correction is added.

    e) Annex I on evaluation method of non-standard lightning overvoltage shape is added.

    It has the status of a horizontal standard in accordance with IEC Guide 108.

    General Product Information - (Show below) - (Hide below)

    Committee TC 99
    Development Note Supersedes IEC 60071A (03/2001) Also available in CD-ROM format. Stability Date: 2021. (03/2018)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC 62271-100:2008+AMD1:2012+AMD2:2017 CSV High-voltage switchgear and controlgear - Part 100: Alternating-current circuit-breakers
    IEC 60099-4:2014 Surge arresters - Part 4: Metal-oxide surge arresters without gaps for a.c. systems
    IEC TR 60071-4:2004 Insulation co-ordination - Part 4: Computational guide to insulation co-ordination and modelling of electrical networks
    ISO 2533:1975 Standard Atmosphere
    IEC 60099-6:2002 Surge arresters - Part 6: Surge arresters containing both series and parallel gapped structures - Rated 52 kV and less
    IEC 60505:2011 Evaluation and qualification of electrical insulation systems
    IEC 60099-5:2013 Surge arresters - Part 5: Selection and application recommendations
    IEC 62271-1:2017 High-voltage switchgear and controlgear - Part 1: Common specifications for alternating current switchgear and controlgear
    IEC 60099-8:2017 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 60060-1:2010 High-voltage test techniques - Part 1: General definitions and test requirements
    IEC 60507:2013 Artificial pollution tests on high-voltage ceramic and glass insulators to be used on a.c. systems
    IEC 60071-1:2006+AMD1:2010 CSV Insulation co-ordination - Part 1: Definitions, principles and rules
    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
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