Debugging a relay model can be advantageous when having trouble with the model. There are multiple cases where you have to debug a relay model. For example the relay does not trip and you want to find out the reason or you want to observe internal signals.

In both cases, you have to look into the model and observe input, output or internal signals of the various different blocks contained in the relay model. In order to access these signals follow these steps:

    1. Execute a static calculation (short-circuit or load flow).
    2. Open the dialog of the relay object of interest (ElmRelay) and press the “Contents” button to access a browser containing the relay blocks.
    3. Select the relevant block and enable the detailed mode.
    4. Switch to the flexible data page.
    5. Click on the button “Variable Selection”
    6. Select the Variable Set “Signals”.
    7. Add the result variables you want to access and press OK.

You should now see the signals in the flexible data page. Basically it is the same process as accessing results of other objects like lines or transformers.

The attached picture shows an example with the steps to access the input and output signals of an overcurrent block in a generic relay model. In the same manner you are able to access all signals which are contained inside a relay model scheme.