Transient Ground Fault

Simulation of steady state and transient ground-faults in isolated or compensated networks

Transient Ground Fault tests the directional decision of transient or steady-state ground fault relays in grids with isolated or compensated grounding. It produces the transient voltages and currents during a ground fault from a fault simulation with a pre-defined network model. The network simulation provides testing with realistic current and voltage waveforms. The model simulates a spur line. The calculated quantities are determined by the parameters of the line and the feeding network.

For testing the directional decision of steady-state ground fault relays, the steady-state fault quantities after the decay of the transient process can be continuously output. To allow for the testing of relays in both the forward and the reverse direction, the fault can be applied on different feeders.

The module performs an automatic assessment of the measured data based on the user’s specific application. The output signals are shown in a separate view. They can also be displayed or printed with the automatically generated test report. The test execution can be manually initiated or synchronized by using an external trigger signal.


The module is of particular assistance when:

  • setting the relay
  • checking the relay’s directional characteristic

Both three-phase systems and two-phase systems (e.g. for railway applications) can be simulated.


For a comprehensive simulation of ground faults, we recommend to use RelaySimTest. A Transient Ground Fault license is included in a RelaySimTest license.

This module is part of the Test Universe software. For more information please refer to the Test Universe website.

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