IEC 60909 Standard

Short Circuit IEC 60909 Standard 

ETAP Short Circuit Analysis complies with IEC 60909 standard, which classifies short-circuit currents according to their magnitudes (maximum and minimum) and fault distances from generators. Maximum short-circuit currents determine equipment ratings, while minimum currents dictate protective device settings.

Key Features

  • 1-pole / 2-pole short circuit device duty for single-phase panel / UPS systems
  • Unbalanced L-G, L-L, & L-L-G fault current analysis
  • Short circuit study calculations based on IEC 60909, 60282, 60781 & 60947
  • Compares protective device ratings with calculated short circuit values
  • User-definable voltage C factor
  • Service or ultimate short circuit current ratings for LVCB breaking capability
  • User-definable R/X adjustment methods for Ip (method A, B, or C)
  • Phase-shifting transformers
  • Negative or positive impedance adjustments for max/min sub-transient & steady-state currents
  • Automatic application of K correction factors (i.e., KT, KG, KSO) 
  • Automatically determines meshed & non-meshed networks for calculating Ib, Ik, & Idc
  • Considers both near & far short circuit current from generators
  • Detailed IEC device duty reports & complete contributions for unbalanced faults

  • Integrates with protective device coordination
  • Load terminal short circuit calculation
  • Ib for meshed network is adjusted by individual machine contributions for improved accuracy
  • Wind Power Station Units
    • With Asynchronous Generators
    • With Doubly-Fed Asynchronous Generator
    • With Full-Size Power Converter
  • PV Power Station Units
    • With Full Size Converter

Short Circuit Standards

IEC 62271-100 High-Voltage Switchgear and Controlgear, Part 100:High-Voltage Alternating-Current Circuit Breakers
IEC 62271-200 High-Voltage Switchgear and Controlgear, Part 200: AC Metal-Enclosed Switchgear and Controlgear for Rated Voltages
Above 1 kV and up to and including 52 kV
IEC 62271-203 High-Voltage Switchgear and Controlgear, Part 203: Gas-Insulated Metal-Enclosed Switchgear for Rated Voltages Above 52 kV
IEC 60282-2 High-Voltage Fuses, Part 2: Expulsion Fuses
IEC 60909-0 Short Circuit Currents in Three-Phase AC Systems, Part 0: Calculation of Currents Edition 2.0 2016-01
IEC 60909-1 Short Circuit Currents in Three-Phase AC Systems, Part 1: Factors for the Calculation of Short Circuit Currents According to IEC 60909-0
IEC 60909-2 Electrical Equipment – Data for Short Circuit Current Calculations in Accordance with IEC 909
IEC 60909-4 Short Circuit Currents in Three-Phase AC Systems, Part 4: Examples for the Calculation of Short Circuit Currents
IEC 60947-1 Low Voltage Switchgear and Controlgear, Part 1: General Rules
IEC 60947-2 Low Voltage Switchgear and Controlgear, Part 2: Circuit Breakers
IEC 61363-1 Electrical Installations of Ships and Mobile and Fixed Offshore Units, Part 1: Procedures for Calculating Short Circuit Currents in Three-Phase AC
IEC 60781 Application guide for calculation of short circuit currents in low-voltage radial systems


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Electrical Power System Analysis