• IEC TR 60909-1:2002

    Current The latest, up-to-date edition.

    Short-circuit currents in three-phase a.c. systems - Part 1: Factors for the calculation of short-circuit currents according to IEC 60909-0

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

    Published date:  31-07-2002

    Publisher:  International Electrotechnical Committee

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

    FOREWORD
    1 General
       1.1 Scope and object
       1.2 Reference documents
       1.3 Application of the factors
            1.3.1 Factor [c]
            1.3.2 Factors K[G] and K[S] or K[SO]
            1.3.3 Factors K[G,S], K[T,S] or K[G,SO], K[T,SO]
            1.3.4 Factor K[T]
            1.3.5 Factor [kappa]
            1.3.6 Factors [mu], [lambda] and [q]
            1.3.7 Factors [m] and [n]
            1.3.8 Contribution of asynchronous motors to the
                  initial symmetrical short-circuit current
       1.4 Symbols, subscripts and superscripts
            1.4.1 Symbols
            1.4.2 Subscripts
            1.4.3 Superscripts
    2 Factors used in IEC 60909-0
       2.1 Voltage factor [c] for the equivalent voltage source
            at the short-circuit location
            2.1.1 General
            2.1.2 Calculation methods
            2.1.3 Equivalent voltage source at the short-circuit
                  location and voltage factor [c]
            2.1.4 A simple model illustrating the meaning of the
                  voltage factor [c]
       2.2 Impedance-correction factors when calculating the
            short-circuit impedances of generators, unit
            transformers and power-station units
            2.2.1 General
            2.2.2 Correction factor K[G]
            2.2.3 Correction factors for power station units with
                  on-load tap changer
            2.2.4 Correction factors for power station units
                  without on-load tap-changer
            2.2.5 Influence of the impedance correction factor for
                  power-station units when calculating short-circuit
                  currents in meshed networks and maximum
                  short-circuit currents at worst-case load flow
       2.3 Impedance correction factor K[T] when calculating the
            short-circuit impedances of network transformers
            2.3.1 General
            2.3.2 Example for a network transformer S[rT] = 300 MVA
            2.3.3 Statistical examination of 150 network transformers
            2.3.4 Impedance correction factors for network
                  transformers in meshed networks
       2.4 Factor [kappa] for the calculation of the peak
            short-circuit current
            2.4.1 General
            2.4.2 Factor [kappa] in series R-L-circuits
            2.4.3 Factor [kappa] of parallel R-L-Z branches
            2.4.4 Calculation of the peak short-circuit current I[p]
                  in meshed networks
            2.4.5 Example for the calculation of [kappa] and I[p] in
                  meshed networks
       2.5 Factor [mu] for the calculation of the symmetrical
            short-circuit breaking current
            2.5.1 General
            2.5.2 Basic concept
            2.5.3 Calculation of the symmetrical short-circuit
                  breaking current I[b] with the factor [mu]
       2.6 Factor [lambda] (lambda[max], lambda[min]) for the
            calculation of the steady-state short-circuit current
            2.6.1 General
            2.6.2 Influence of iron saturation
       2.7 Factor [q] for the calculation of the short-circuit
            breaking current of asynchronous motors
            2.7.1 General
            2.7.2 Derivation of factor [q]
            2.7.3 Short-circuit breaking currents in the case of
                  unbalanced short circuits
       2.8 Factors [m] and [n] for the calculation of the Joule
            integral or the thermal equivalent short-circuit current
            2.8.1 General
            2.8.2 Time-dependent three-phase short-circuit current
            2.8.3 Factor [m]
            2.8.4 Factor [n]
            2.8.5 Factor [n] in IEC 60909-0, figure 22
       2.9 Statement of the contribution of asynchronous motors or
            groups of asynchronous motors (equivalent motors) to the
            initial symmetrical short-circuit current
            2.9.1 General
            2.9.2 Short circuit at the terminals of asynchronous
                  motors
            2.9.3 Partial short-circuit currents of asynchronous
                  motors fed through transformers
            2.9.4 Sum of partial short-circuit currents of several
                  groups of asynchronous motors fed through several
                  transformers
    Bibliography
    Figures
    Tables

    Abstract - (Show below) - (Hide below)

    Applies to short-circuit currents in three-phase a.c. systems. This technical report aims at showing the origin and the application, as far as necessary, of the factors used to meet the demands of technical precision and simplicity when calculating short-circuit currents according to IEC 60909-0.

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

    Committee TC 73
    Development Note To be read in conjunction with IEC 60909-0. (08/2002) Also numbered as BS PD7639-1(1994). (08/2005) Stability Date: 2018. (10/2012)
    Document Type Technical Report
    Publisher International Electrotechnical Committee
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    BS IEC 60092-202:2016 (published 2016-09) Electrical installations in ships System design. Protection
    CEI EN 60027-7 : 2011 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    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
    BS EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    CEI 14-4/8 : 2001 POWER TRANSFORMERS - APPLICATION GUIDE
    EN 62271-1:2017 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: COMMON SPECIFICATIONS FOR ALTERNATING CURRENT SWITCHGEAR AND CONTROLGEAR (IEC 62271-1:2017)
    IEC 61230:2008 Live working - Portable equipment for earthing or earthing and short-circuiting
    EN 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
    EN 61230:2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    BS IEC 60076-8 : 1997 POWER TRANSFORMERS - APPLICATION GUIDE
    08/30140577 DC : DRAFT JULY 2008 BS EN 60027-7 - LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    12/30270636 DC : 0 BS EN 60909-0 - SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS - PART 0: CALCULATION OF CURRENTS
    IEC 60204-1:2016 Safety of machinery - Electrical equipment of machines - Part 1: General requirements
    CEI 18-63 : 2013 MOBILE AND FIXED OFFSHORE UNITS - ELECTRICAL INSTALLATIONS - PART 2: SYSTEM DESIGN
    UNE-IEC/TR 60909-2:2010 IN Short-circuit currents in three-phase a.c. systems - Part 2: Data of electrical equipment for short-circuit current calculations
    IEC 60092-202 REDLINE : 5ED 2016 ELECTRICAL INSTALLATIONS IN SHIPS - PART 202: SYSTEM DESIGN - PROTECTION
    BS PD 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 TR 60909-4:2000 Short-circuit currents in three-phase a.c. systems - Part 4: Examples for the calculation of short-circuit currents
    BS EN 62271-1:2017 High-voltage switchgear and controlgear Common specifications for alternating current switchgear and controlgear
    I.S. EN 61230:2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    BIS IS/IEC 62271-1 : 2007 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: COMMON SPECIFICATIONS
    IEC 61892-2:2012 Mobile and fixed offshore units - Electrical installations - Part 2: System design
    IEC 62271-1:2017 High-voltage switchgear and controlgear - Part 1: Common specifications for alternating current switchgear and controlgear
    IEC 60092-202:2016 RLV Electrical installations in ships - Part 202: System design - Protection
    15/30290209 DC : 0 BS IEC 60092-202 ED 5.0 - ELECTRICAL INSTALLATIONS IN SHIPS - PART 202: SYSTEM DESIGN - PROTECTION
    BS EN 61230 : 2008 LIVE WORKING - PORTABLE EQUIPMENT FOR EARTHING OR EARTHING AND SHORT-CIRCUITING
    08/30186863 DC : DRAFT JULY 2008 BS EN ISO 4414 - PNEUMATIC FLUID POWER - GENERAL RULES AND SAFETY REQUIREMENTS FOR SYSTEMS AND THEIR COMPONENTS
    BS EN 60909-0:2016 Short-circuit currents in three-phase a.c. systems Calculation of currents
    I.S. EN 62271-1:2017 HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: COMMON SPECIFICATIONS FOR ALTERNATING CURRENT SWITCHGEAR AND CONTROLGEAR
    I.S. EN 60027-7:2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    IEC 60076-8:1997 Power transformers - Part 8: Application guide
    I.S. EN 60909-0:2016 SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS - PART 0: CALCULATION OF CURRENTS
    IEC 60092-202:2016 Electrical installations in ships - Part 202: System design - Protection
    IEC 60027-7:2010 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution
    15/30265353 DC : 0 BS EN 62271-1 ED 2 - HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 1: COMMON SPECIFICATIONS FOR ALTERNATING CURRENT SWITCHGEAR AND CONTROLGEAR
    ENA ER G83/2 : ISSUE 2 2012 RECOMMENDATIONS FOR THE CONNECTION OF TYPE TESTED SMALL-SCALE EMBEDDED GENERATORS (UP TO 16A PER PHASE) IN PARALLEL WITH LOW-VOLTAGE DISTRIBUTION SYSTEMS
    BS IEC 61892-2:2012 Mobile and fixed offshore units. Electrical installations System design
    EN 60027-7 : 2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION

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

    IEC 60038:2009 IEC standard voltages
    IEC 60909-3 : 3.0 SHORT-CIRCUIT CURRENTS IN THREE-PHASE AC SYSTEMS - PART 3: CURRENTS DURING TWO SEPARATE SIMULTANEOUS LINE-TO-EARTH SHORT CIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH
    IEC 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
    IEC 60865-1:2011 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
    IEC 60909:1988 Short-circuit current calculation in three-phase a.c. systems
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