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Request, Online Tap Changer Example

Hey Guys, I was wondering if someone had an example of how the OLTC1T works. This is what I have entered into a dyr file.

108,'OLTC1T', 107 ,  1,20,0,2.5/

From what I understand from the documentation this will control the transformer from bus 108 to 107. This will have a CID of 1 and from page 814 in the models.pdf it will have a time delay of 20, a time constant of 0 and a subsequent time before tap signals is sent of 2.5.

However I am not sure what voltage it is controlling to?

Also I am unsure as to what these delays actually mean.

Ultimately I would like to use this model in order to change the tap every timestep (I know this may sound silly) after a certain period of time.

Any Help would be appreciated. Cheers