I'm new to relay testing and my question will be basic, but that's how we learn. I'm looking at a GE 489 relay where the manual says to use a 3 phase Variable AC test set as means for secondary injection. Does anyone know what test set is best for this type of application? The book doesn't suggest any make or model/ part number. I just want to use the right test set to be able to test as per the user manual.
Any suggestions?