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Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

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  • #1

    Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

    It is very important for the protection engineer to calculate the max and min fault currents of the system before starting the relays coordination.
    This topic shows how DIgSILENT PowerFactory simulation software calculates the exact fault currents of a typical network.
    The image below shows had calculations of the currents at different busbars.
    The protection engineers needs the fult current values to calulate the relay pickup current and the multiple fault currents for the inverse cahracteristics of the relays.

    Click image for larger version Name: 5_2.png Views: 1 Size: 107.2 KB ID: 699
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  • #2
    Re: Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

    This the PowerFactory model for calculation of Max short circuit current.
    It shows the fault levels at each bus.
    It is very clear that the figures of the model are very identical to hand calculations.
    For example, the fault current at load bus is 202.7 A as shown in the PowerFactory model and hand calculations.

    Click image for larger version Name: 5_2_1.png Views: 1 Size: 82.8 KB ID: 566

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    • #3
      Re: Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

      This the PowerFactory model for calculation of minimum short circuit current.
      It shows the fault levels at each bus.
      It is very clear that the figures of the model are very identical to hand calculations.
      For example the fult current at load bus = 165 A in the model and the theoritical calculations.

      Click image for larger version Name: 5_2_2.png Views: 1 Size: 81.4 KB ID: 567

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      • #4
        Re: Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

        You will notice that the second transformer is isolated.
        This is very important when calculating the min short circuit level.
        Changing the type of fault does not guarantee that we are calculating the min possible fault current, operational scenario will also affect the calculations.

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        • #5
          Re: Example of Calculation of Maximum and Minimum Fault Currents Using PowerFactory

          Good thread for students and beginners in PowerFactory.

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