• SN EN 60909-3 : 2003

    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

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    Published date:  12-01-2013

    Publisher:  Swiss Standards

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

    FOREWORD
    1 Scope
    2 Normative reference
    3 Terms and definitions
    4 Symbols
    5 Currents during two separate simultaneous line-to-earth
      short circuits
      5.1 Calculation method
          5.1.1 Initial symmetrical short-circuit current
          5.1.2 Peak short-circuit current, symmetrical
                short-circuit breaking current and steady-state
                short-circuit current
          5.1.3 Distribution of line-to-earth short-circuit
                currents during two separate simultaneous
                line-to-earth short circuits
    6 Partial short-circuit currents flowing through earth in
      the case of an unbalanced short circuit
      6.1 Calculation method
          6.1.1 General
          6.1.2 Line-to-earth short circuit in a station
          6.1.3 Line-to-earth short circuit far outside a station
          6.1.4 Line-to-earth short circuit in the vicinity of a
                station
          6.1.5 Reduction factor for overhead lines and cables
    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 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 Hz.

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    Document Type Standard
    Publisher Swiss Standards
    Status Current
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