30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 1/23

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Example of Over Current Protection Setting using DIgSILENT PowerFactory

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09-04-2010, 07:52 PM #1

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 2/23

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

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 3/23

Last 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

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

#2

smart

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 4/23

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

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09-04-2010, 08:00 PM #3

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 5/23

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

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 6/23

The minimum fault current = 758 A as expected

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

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09-04-2010, 08:18 PM #4

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 7/23

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

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 8/23

This will take you to library as shown in figure below.

Choose the following relay as an example in this exercise.

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 9/23

Other relays can be used if desirable.

Library ----> Relays ----> Relays ---->

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

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 10/23

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

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 11/23

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 12/23

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

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

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 13/23

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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.

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 14/23

Then from drop down menu select

Relays, Current and Voltage Transformers as shown

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 15/23

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 16/23

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

smart

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 17/23

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.

Guest

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 18/23

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

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 19/23

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

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 20/23

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

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 21/23

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.

30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 22/23

Overview of PowerFactory Functions | National Grid of UK publishes 2011 Seven Year Statement using DIgSILENT PowerFactory

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30 4 2014 Example of Over Current Protection Setting using DIgSILENT PowerFactory

http://www.albanah.org/ss/showthread.php?228-Example-of-Over-Current-Protection-Setting-using-DIgSILENT-PowerFactory&s=c053e42d6d74e95bc505cc3af665b46c 23/23

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