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Example of Over Current Protection Setting using DIgSILENT PowerFactory
Thread: Example of Over Current Protection Setting using DIgSILENT PowerFactory
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09-04-2010, 07:52 PM
#1
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.
smart
GuestLast edited by smart; 09-04-2010 at 08:34 PM.
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09-04-2010, 07:55 PM
Modelling of the network using PowerFactory
#2
smart
Last edited by smart; 09-04-2010 at 08:36 PM.
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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.
smart
GuestThe minimum fault current = 758 A as expected
Last edited by smart; 09-04-2010 at 08:37 PM.
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The next step is to define the protection relay.
Right click below the transformer and select New Devices ---> Relay Model
At Relay Type click Select Global Type
smart
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 ---->
Last edited by smart; 09-04-2010 at 08:40 PM.
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09-04-2010, 08:29 PM
Now it is time to define the CT for this relay
Click on Create CT as shown below
#5
smart
Then choose currnet ratio ----> write 800 A in primary. Click OK
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09-04-2010, 08:47 PM
Now we need to display the rely using colour.
Click on colour map as shown below.
#6
smart
Then from drop down menu select
When you click OK, the SLD shows now the line in Red where relay is connected.
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09-04-2010, 09:01 PM
#7
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.
The log graph appears as another sheet as shown below.
GuestThere 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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