Fault level

Fault level analysis simulates the effects of various types of short circuits on the A.C. busbars of the system.fault-level1

The fault level module contains the following features:

  • Fault level engine validated against actual test results
  • Complies with G74 methodology
  • Pure IEC60909 calculation
  • Explicit representation of zero sequence networks including delta windings
    • Zero sequence branches and shunts with no positive sequence representation
  • Includes pre-fault loading and load currents
    • Optional flat voltage profile before calculation
  • Synchronous machine modelling
    • Saturation (explicitly or only for faults near to machine)
    • Salient pole (second harmonic effects)
    • Simplified Grid infeed representation
  • Fault types available
    • L-L-L (three phase)
    • L-G (single phase to ground)
    • L-L
    • L-L-G
  • Fault resistance and reactance
  • Reporting at specified time for specified fault
    • Peak
    • Asymmetrical
    • Symmetrical
    • Waveform (all phases, RMS and DC components)
  • Breaker duty calculation and report
  • Fault at specified time includes
    • AC current decrement (decay)
    • DC current decrement (unidirectional decay)
    • Phase components (voltage and current)
    • Sequence components (voltage and current)
  • Fault reporting
    • All busbars
    • Fault flows for specified fault location
    • Individual phase current flows
  • Single and Double cage induction machines
  • Motor start calculation
    • Initial voltage dip
  • DC X/R ratio
    • DC decay method
    • Initial voltage dip