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  • IEC 60949:1988

    Current The latest, up-to-date edition.

    Calculation of thermally permissible short-circuit currents, taking into account non-adiabatic heating effects

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    Published date:  25-11-1988

    Publisher:  International Electrotechnical Committee

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

    FOREWORD
    PREFACE
    INTRODUCTION
    Clause
    1 List of symbols
    2 Permissible short-circuit current
    3 Calculation of adiabatic short-circuit current
    4 Calculation of short-circuit temperature
    5 Calculation of non-adiabatic factor for conductors
       and spaced wire screens
    6 Calculation of non-adiabatic factor for sheaths,
       screens and wires
    FIGURE
    APPENDIX A - Explanation of recommended methods for
                 taking into account non-adiabatic heating
                 effect when calculating permissible
                 short-circuit currents

    Abstract - (Show below) - (Hide below)

    The approach set out in this standard is to: a) calculate the adiabatic short-circuit current, b) calculate a modifying factor that takes account of the non-adiabatic heating effect, c) multiply a) and b) to obtain permissible short-circuit current.

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    Development Note Also numbered as BS 7454(1991). (10/2005) Stability Date: 2017. (09/2017)
    Document Type Standard
    Publisher International Electrotechnical Committee
    Status Current

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

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    I.S. EN 50522:2010 EARTHING OF POWER INSTALLATIONS EXCEEDING 1 KV A.C.
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    BS EN 50522:2010 Earthing of power installations exceeding 1 kV a.c.
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    HD 620 : 2010 DISTRIBUTION CABLES WITH EXTRUDED INSULATION FOR RATED VOLTAGES FROM 3,6/6 (7,2) KV UP TO AND INCLUDING 20,8/36 (42) KV
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    08/30191664 DC : DRAFT OCT 2008 BS EN 50522 - EARTHING OF POWER INSTALLATIONS EXCEEDING 1 KV A.C.
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    NF EN 50522 : 2012 EARTHING OF POWER INSTALLATIONS EXCEEDING 1 KV A.C.
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    CEI EN 61660-2 : 1999 SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - PART 2: CALCULATION OF EFFECTS
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    I.S. EN 61660-2:1999 SHORT-CIRCUIT CURRENTS IN D.C. AUXILIARY INSTALLATIONS IN POWER PLANTS AND SUBSTATIONS - CALCULATION OF EFFECTS
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    I.S. EN 50483-5:2009 TEST REQUIREMENTS FOR LOW VOLTAGE AERIAL BUNDLED CABLE ACCESSORIES - PART 5: ELECTRICAL AGEING TEST
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    BS EN 60909-0:2016 Short-circuit currents in three-phase a.c. systems Calculation of currents
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    I.S. HD 60364-5-54:2011 LOW-VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS AND PROTECTIVE CONDUCTORS
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    IEC 60986:2000+AMD1:2008 CSV Short-circuit temperature limits of electric cables with rated voltages from 6 kV (Um = 7,2 kV) up to 30 kV (Um = 36 kV)
    I.S. EN 61936-1:2010 POWER INSTALLATIONS EXCEEDING 1 KV A.C. - PART 1: COMMON RULES
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    IEC 60364-5-54:2011 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
    I.S. EN 60909-0:2016 SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS - PART 0: CALCULATION OF CURRENTS
    UNE-EN 50522:2012 Earthing of power installations exceeding 1 kV a.c.
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    PD IEC/TS 61936-2:2015 Power installations exceeding 1 kV a.c. and 1,5 kV d.c. d.c.
    BS EN 61936-1 : 2010 POWER INSTALLATIONS EXCEEDING 1 KV A.C - PART 1: COMMON RULES
    UNE-EN 61936-1:2012 Power installations exceeding 1 kV a.c. -- Part 1: Common rules
    EN 45510-2-7:2002 Guide for procurement of power station equipment - Part 2-7: Electrical equipment - Switchgear and controlgear
    I.S. EN 45510-2-8:2004 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-8: ELECTRICAL EQUIPMENT - POWER CABLES
    BS EN 61660-2:1997 Short-circuit currents in d.c. auxiliary installations in power plants and substations Calculation of effects
    I.S. EN 61238-1:2003 COMPRESSION AND MECHANICAL CONNECTORS FOR POWER CABLES FOR RATED VOLTAGES UP TO 36 KV (U[M] = 42 KV) - PART 1: TEST METHODS AND REQUIREMENTS
    ICEA P 32 382 : 2007(R2018) SHORT CIRCUIT CHARACTERISTICS OF INSULATED CABLES
    UNI CEI EN 45510-2-8 : 2011 GUIDE FOR PROCUREMENT OF POWER STATION EQUIPMENT - PART 2-8: ELECTRICAL EQUIPMENT - POWER CABLES
    UNE-EN 60865-1:2013 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
    I.S. HD 637:1999 POWER INSTALLATIONS EXCEEDING 1 KV A.C.
    EN 62477-1:2012/A1:2017 SAFETY REQUIREMENTS FOR POWER ELECTRONIC CONVERTER SYSTEMS AND EQUIPMENT - PART 1: GENERAL (IEC 62477-1:2012/A1:2016)
    07/30170388 DC : 0 BS EN 60364-5-54 - LOW VOLTAGE ELECTRICAL INSTALLATIONS - PART 5-54: SELECTION AND ERECTION OF ELECTRICAL EQUIPMENT - EARTHING ARRANGEMENTS, PROTECTIVE CONDUCTORS AND PROTECTIVE BONDING CONDUCTORS
    IEC 60865-1:2011 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
    EN 60865-1:2012 Short-circuit currents - Calculation of effects - Part 1: Definitions and calculation methods
    EN 50522:2010 Earthing of power installations exceeding 1 kV a.c.
    EN 61238-1:2003 Compression and mechanical connectors for power cables for rated voltages up to 36 kV (Um = 42 kV) - Part 1: Test methods and requirements
    EN 61660-2:1997 Short-circuit currents in d.c. auxiliary installations in power plants and substations - Part 2: Calculation of effects
    UNE-HD 60364-5-54:2015 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
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