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Vision Fault Finder

Any fault in the electricity supply leads to inconvenience for users and costs for network operators: the sooner the fault is resolved or reduced, the better. Usually, the cause is a issue in the medium-voltage grid. In order to locate such faults quickly, Phase to Phase developed the Vision Fault Finder program in collaboration with grid manager Alliander. Vision Network Analysis uses the current and voltage measurements of substations analyzed by Vision Fault Finder to calculate the fault location at lightning speed.

Charles-Augustin Coulomb

Step 1. Communication

Following an interruption in an MV cable network, all recorded voltage and current measurements are uploaded to the control centre from the substation. This recording also includes pre- and post-fault data. The Vision Fault Finder application, installed at the control centre, is triggered and starts processing the received data.

Step 2. Signal processing

The incoming measurements are processed and analysed and it is determined whether there is a real fault or another malfunction, using an impedance classification system. The results, including the fault impedance, are automatically passed on to Vision Network Analysis.

Step 3. Simulation

Vision Network Analysis selects the correct network model and performs a number of short circuit analyses corresponding to the found fault type. After these calculations, the measured impedance from Vision Fault Finder is compared with the impedances resulting from the simulation in order to identify the fault section.

Step 4. Visualization

The location will be visible both in the diagram and on a geographical background and a report with all the details will be printed. With this information, the short circuit will be located efficiently. Finally the supply can be restored by rerouting the distribution feeders.


  • Accuracy: two- and three-phase errors within 100 metres. Single phase faults in earthed grids 500 metres.
  • Processing time: less than 20 seconds.
  • Digital Fault Recording formats: SASensorâ„¢ and Comtrade 1999.
  • Fast Fourier algorithm for signal processing.
  • Impedance classification algorithm that deduces the type of fault.
  • The algorithm is capable of distinguishing between a real fault and other malfunctions.
  • Automatic archiving of fault analysis results on the hard disk.
  • Automatically generate and print a report after an fault analysis.
  • Configuration and settings per substation.
  • Zooming in and out of current and voltage graphs.
  • Export results to ASCII or Microsoft Excel files.

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