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Thread: Example of Over Current Protection Setting using DIgSILENT PowerFactory

  1. #1
    smart
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    Smile Example of Over Current Protection Setting using DIgSILENT PowerFactory

    This exercise shows how the PF can be used to calculate fault currents and set an overcurrent relay. The coordination graphs will be shown and tripping calculations will be displayed.

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    Last edited by smart; 09-04-2010 at 08:34 PM.

  2. #2
    smart
    Guest

    Default Modelling of the network using PowerFactory

    The first setp is to model the network. This is done by creating a new project.

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    Last edited by smart; 09-04-2010 at 08:36 PM.

  3. #3
    smart
    Guest

    Default Calculation of Maximum and Minimum Fault Currents

    As known from basic power system theory that the maximum fault current occurs at network when we have three phase fault.
    The figure below shows the result when parameters are defined in the PwerFactory model.

    The maximum fault current = 875 A as expected.

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    The minimum fault current = 758 A as expected

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    Last edited by smart; 09-04-2010 at 08:37 PM.

  4. #4
    smart
    Guest

    Default

    The next step is to define the protection relay.

    Right click below the transformer and select New Devices -----> Relay Model

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    At Relay Type click Select Global Type

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    This will take you to library as shown in figure below.
    Choose the following relay as an example in this exercise.
    Other relays can be used if desirable.

    Library ----> Relays ----> Relays ---->
    select then Overcurrent Relays ----> GE Alstom ----> MCGG Series ----> MCGG-22.

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    Last edited by smart; 09-04-2010 at 08:40 PM.

  5. #5
    smart
    Guest

    Default

    Now it is time to define the CT for this relay
    Click on Create CT as shown below

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    Then choose currnet ratio ----> write 800 A in primary. Click OK

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    Last edited by smart; 09-04-2010 at 08:31 PM.

  6. #6
    smart
    Guest

    Default

    Now we need to display the rely using colour.
    Click on colour map as shown below.

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    Then from drop down menu select
    Relays, Current and Voltage Transformers as shown

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    When you click OK, the SLD shows now the line in Red where relay is connected.

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  7. #7
    smart
    Guest

    Default

    We need now to create the graph for the protection devices.

    Right click on the SLD where the relay is connected as sown below.
    Then select Create Time-Overcurrent Plot.

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    The log graph appears as another sheet as shown below.

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    We can also click right on the graph and add the Transformer Damage Curve as shown.

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    Colour of Transformer Damage Curve can be chosen as shown below.

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    We can also select the voltage base for displaying the graphs, as shown below.

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    There is also of course option to display the fault current (875 A) in different colour (blue)
    and also the tripping time of relay (1.357 s) for that fault current.

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  8. #8
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    Default Re: Example of Over Current Protection Setting using DIgSILENT PowerFactory

    Thank you for this topic

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