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  • IEC 60909:1988

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    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Short-circuit current calculation in three-phase a.c. systems

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

    Superseded date:  01-07-2001

    Language(s):  English - French

    Published date:  15-05-1988

    Publisher:  International Electrotechnical Committee

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

    FOREWORD
    PREFACE
    Clause
    1 Scope
    2 Object
    3 Definitions
    4 Symbols, subscripts and superscripts
    4.1 Symbols
    4.2 Subscripts
    4.3 Superscripts
    5 Calculation assumptions
    6 Equivalent voltage source at the short-circuit location
    SECTION ONE - SYSTEMS WITH SHORT-CIRCUIT CURRENTS HAVING NO A.C.
                  COMPONENT DECAY (FAR-FROM-GENERATOR SHORT CIRCUITS)
    7 General
    8 Short-circuit parameters
    8.1 Balanced short circuit
    8.2 Unbalanced short circuit
    8.3 Short-circuit impedances
    8.4 Conversion of impedances, currents and voltages
    9 Calculation of short-circuit currents
    9.1 Calculation method for balanced short circuits
    9.2 Calculation method for line-to-line and line-to-earth short
          circuits
    9.3 The minimum short-circuit currents
    SECTION TWO - SYSTEMS WITH SHORT-CIRCUIT CURRENTS HAVING
                  DECAYING A.C. COMPONENTS (NEAR-TO-GENERATOR SHORT
                  CIRCUITS)
    10 General
    11 Short-circuit parameters
    11.1 General
    11.2 Balanced short circuit
    11.3 Unbalanced short circuit
    11.4 Equivalent voltage source at the short-circuit location
    11.5 Short-circuit impedances
    11.6 Conversion of impedances, currents and voltages
    12 Calculation of short-circuit currents
    12.1 General
    12.2 Calculation
    12.3 Calculation method for line-to-line and line-to-earth short
          circuits
    12.4 The minimum short-circuit currents
    13 Influence of motors
    13.1 Synchronous motors and synchronous compensators
    13.2 Asynchronous motors
    13.3 Static converter fed drives
    14 Consideration on non-rotating loads and capacitors
    14.1 Parallel capacitors
    14.2 Series capacitors
    APPENDIX A - Calculation of short-circuit currents, examples

    Abstract - (Show below) - (Hide below)

    This standard is applicable to the calculation of short-circuitcurrents:-in low-voltage three-phase a.c. systems,-in high-voltage three-phase a.c. systems with nominal voltages upto 230 kV operating at nominal frequency (50 Hz or 60 Hz).This standardized procedure is given in such a form as tofacilitate as far as possible its use by non-specialist engineers.

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

    Development Note BS DRAFT 96/216008 DC REFERS TO A REVISION
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Superseded
    Superseded By

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    BS EN 50522:2010 Earthing of power installations exceeding 1 kV a.c.
    EN 60439-2:2000/A1:2005 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 2: PARTICULAR REQUIREMENTS FOR BUSBAR TRUNKING SYSTEMS (BUSWAYS)
    BS 7430(2011) : 2011 CODE OF PRACTICE FOR PROTECTIVE EARTHING OF ELECTRICAL INSTALLATIONS
    08/30190022 DC : DRAFT SEP 2008 BS EN 60865-1 - SHORT-CIRCUIT CURRENTS - CALCULATION OF EFFECTS - PART 1: DEFINITIONS AND CALCULATION METHODS
    BS IEC 60076-8:1997 Power transformers Application guide
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    NF EN 60027-7 : 2011 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
    08/30191891 DC : DRAFT OCT 2008 BS EN 61936-1 - POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
    98/232755 DC : DRAFT DEC 1998 IEC 61936-1 - POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
    I.S. EN 62428:2008 ELECTRIC POWER ENGINEERING - MODAL COMPONENTS IN THREE-PHASE A.C. SYSTEMS - QUANTITIES AND TRANSFORMATIONS
    IEC 61363-1:1998 Electrical installations of ships and mobile and fixed offshore units - Part 1: Procedures for calculating short-circuit currents in three-phase a.c.
    IEC TR 60909-1:2002 Short-circuit currents in three-phase a.c. systems - Part 1: Factors for the calculation of short-circuit currents according to IEC 60909-0
    BS IEC 61363-1:1998 Electrical installations of ships and mobile and fixed offshore units Procedures for calculating short-circuit currents in three-phase a.c.
    94/712993 DC : DRAFT NOV 1994 PREN 45511 - GUIDE FOR PROCUREMENT - ELECTRICAL EQUIPMENT - SWITCHGEAR AND CONTROLGEAR
    BS 7726-1(1994) : 1994 AMD 8218 SHORT-CIRCUIT CURRENTS - CALCULATION OF EFFECTS - DEFINITIONS AND CALCULATION METHODS
    08/30191664 DC : DRAFT OCT 2008 BS EN 50522 - EARTHING OF POWER INSTALLATIONS EXCEEDING 1 KV A.C.
    IEC 60781:1989 Application guide for calculation of short-circuit currents in low-voltage radial systems
    DIN EN 61660-1 : 1998 COR 1 2010 SHORT-CIRCUIT CURRENTS - SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - PART 1: CALCULATION OF SHORT-CIRCUIT CURRENTS
    I.S. EN 61660-1:1999 SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - CALCULATION OF SHORT-CIRCUIT CURRENTS
    CEI EN 61660-1 : 1999 SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - PART 1: CALCULATION OF SHORT-CIRCUIT CURRENTS
    I.S. EN 60439-2:2000 LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES - PART 2: PARTICULAR REQUIREMENTS FOR BUSBAR TRUNKING SYSTEMS (BUSWAYS)
    BS EN 61660-1:1997 Short-circuit currents in d.c auxiliary installations in power plants and substations Calculation of short-circuit currents
    IEEE DRAFT 551 : D5 2005 CALCULATING AC SHORT-CIRCUIT CURRENTS IN INDUSTRIAL AND COMMERCIAL POWER SYSTEMS
    CEI EN 62428 : 2010 ELECTRIC POWER ENGINEERING - MODAL COMPONENTS IN THREE-PHASE A.C. SYSTEMS - QUANTITIES AND TRANSFORMATIONS
    IEC TR 61660-3:2000 Short-circuit currents in d.c. auxiliary installations in power plants and substations - Part 3: Examples of calculations
    IEC 60076-8:1997 Power transformers - Part 8: Application guide
    BS EN 50628:2016 Erection of electrical installations in underground mines
    IEC 60439-2:2000+AMD1:2005 CSV Low-voltage switchgear and controlgear assemblies - Part 2: Particular requirements for busbar trunking systems (busways)
    IEC 62428:2008 Electric power engineering - Modal components in three-phase a.c. systems - Quantities and transformations
    CSA C22.3 No. 61936-1 : 2008 : R2015 POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
    04/30126605 DC : DRAFT DEC 2004 IEC 62256 ED.1 - HYDRAULIC TURBINES, STORAGE PUMPS AND PUMP-TURBINES - GUIDE FOR REHABILITATION AND PERFORMANCE IMPROVEMENT
    95/203556 DC : DRAFT MARCH 1995 PREN 60909-3 - SHORT CIRCUIT CURRENTS - PART 3: CURRENTS DURING TWO SEPARATE SIMULTANEOUS SINGLE-PHASE LINE-TO-EARTH SHORT CIRCUITS AND PARTIAL SHORT-CIRCUIT CURRENTS FLOWING THROUGH EARTH
    VDE 0102-10 : 1998 COR 1 2010 SHORT-CIRCUIT CURRENTS - SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - PART 1: CALCULATION OF SHORT-CIRCUIT CURRENTS
    PD IEC TR 60909-1:2002 Short-circuit currents in three-phase a.c. systems Factors for the calculation of short-circuit currents according to IEC 60909-0
    CSA C22.3 No. 61936-1 : 2008 POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
    IEEE 551 : 2006 CALCULATING SHORT-CIRCUIT CURRENTS IN INDUSTRIAL AND COMMERCIAL POWER SYSTEMS
    IEC 61660-1:1997 Short-circuit currents in d.c. auxiliary installations in power plants and substations - Part 1: Calculation of short-circuit currents
    EN 61660-1:1997 Short-circuit currents in d.c. auxiliary installations in power plants and substations - Part 1: Calculation of short-circuit currents
    API RP 17Z:2024 Medium Voltage Equipment Used on Subsea Production Systems

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

    IEC 60038:2009 IEC standard voltages
    IEC 60050-131:2002 International Electrotechnical Vocabulary (IEV) - Part 131: Circuit theory
    IEC 60865:1986 Calculation of the effects of short-circuit currents
    IEC 60050-151:2001 International Electrotechnical Vocabulary (IEV) - Part 151: Electrical and magnetic devices
    IEC 60050-441:1984 International Electrotechnical Vocabulary (IEV) - Part 441: Switchgear, controlgear and fuses
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