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IEC 60909-3 : 3.0

Current
Current

The latest, up-to-date edition.

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
Available format(s)

Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users

Published date

03-09-2009

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
  5.1 Initial symmetrical short-circuit current
      5.1.1 Determination of M[(1)] and M[(2)]
      5.1.2 Simple cases of two separate simultaneous
            line-to-earth short circuits
  5.2 Peak short-circuit current, symmetrical short circuit
      breaking current and steady-state short-circuit
      current
  5.3 Distribution of the 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
  6.1 General
  6.2 Line-to-earth short circuit inside a station
  6.3 Line-to-earth short circuit outside a station
  6.4 Line-to-earth short circuit in the vicinity of a station
      6.4.1 Earth potential U[Etn] at the tower n outside
            station B
      6.4.2 Earth potential of station B during a line-to
            earth short circuit at the tower n
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
  8.1 Overview
  8.2 Three-core cable
      8.2.1 Line-to-earth short circuit in station B
      8.2.2 Line-to-earth short circuit on the cable between
            station A and station B
  8.3 Three single-core cables
      8.3.1 Line-to-earth short circuit in station B
      8.3.2 Line-to-earth short circuit on the cable between
            station A and station B
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

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.

Committee
TC 73
DevelopmentNote
To be read in conjunction with IEC 60909-0. (03/2009) Stability Date: 2017. (11/2017)
DocumentType
Standard
Pages
125
PublisherName
International Electrotechnical Committee
Status
Current
Supersedes

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
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
EN 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
NF EN 60027-7 : 2011 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
DIN 40108:2003-06 ELECTRIC POWER TECHNOLOGY - CURRENT SYSTEMS - CONCEPTS, QUANTITIES, LETTER SYMBOLS
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
PD IEC/TR 60909-2:2008 Short-circuit currents in three-phase a.c. systems Data of electrical equipment for short-circuit current calculations
IEC TR 62711:2011 MNEMONICS AND DESIGNATIONS OF SYMBOLS FOR MEASURING RELAYS, INSTRUMENTS AND RELATED DEVICE
IEC 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
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 60027-7:2010 LETTER SYMBOLS TO BE USED IN ELECTRICAL TECHNOLOGY - PART 7: POWER GENERATION, TRANSMISSION AND DISTRIBUTION
I.S. EN 60909-0:2016 SHORT-CIRCUIT CURRENTS IN THREE-PHASE A.C. SYSTEMS - PART 0: CALCULATION OF CURRENTS
IEC 60027-7:2010 Letter symbols to be used in electrical technology - Part 7: Power generation, transmission and distribution
PD IEC/TR 62711:2011 Mnemonics and designations of symbols for measuring relays, instruments and related device
BS EN 60027-7:2010 Letter symbols to be used in electrical technology Power generation, transmission and distribution
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
EN 60027-7:2010 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
IEC 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents

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