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    I.S. EN 60909-3:2010

    Current The latest, up-to-date edition.

    SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C SYSTEMS - PART 3: CURRENTS DURING TWO SEPARATE SIMULTANEOUS LINE-TO-EARTH SHORT-CIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  01-01-2010

    Publisher:  National Standards Authority of Ireland

    For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
    Only cited Standards give presumption of conformance to New Approach Directives/Regulations.

    Dates of withdrawal of national standards are available from NSAI.

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

    FOREWORD
    1 Scope and object
    2 Normative references
    3 Terms and definitions
    4 Symbols
    5 Calculation of currents during two separate
      simultaneous line-to-earth short circuits
    6 Calculation of partial short-circuit currents
      flowing through earth in case of an unbalanced
      short circuit
    7 Reduction factor for overhead lines with earth wires
    8 Calculation of current distribution and reduction factor
      in case of cables with metallic sheath or shield earthed
      at both ends
    Annex A (informative) - Example for the calculation of two
            separate simultaneous line-to-earth short-circuit currents
    Annex B (informative) - Examples for the calculation of partial
            short-circuit currents through earth
    Annex C (informative) - Example for the calculation of the
            reduction factor r[1] and the current distribution
            through earth in case of a three-core cable
    Annex D (informative) - Example for the calculation of the
            reduction factor r[3] and the current distribution through
            earth in case of three single-core cables
    Annex ZA (normative) - Normative references to international
             publications with their corresponding European
             publications

    Abstract - (Show below) - (Hide below)

    Describes procedures for calculation of the prospective short-circuit currents with an unbalanced short circuit in high-voltage three-phase a.c. systems operating at nominal frequency 50 Hz or 60 or Hz.

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

    Development Note NSAI reissued 2010 PDF dated 19.02.2015 with IEC Corrigenda incorporated. (06/2017)
    Document Type Standard
    Publisher National Standards Authority of Ireland
    Status Current

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

    IEC TR 60909-2:2008 Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations
    IEC 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
    EN 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
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