Oldfieldguy,
Thanks for the feedback.
Are you saying that the wye-delta configuration is the better way for the step-up? I had thought that the single ground fault detection was better for a wye on the secondary side of the step up.
I have a transformer setup that has a 3000 kVA 480V Delta to 4160/2400V Wye step-up dry-type transformer hooked up to a 4160V Delta to 480V Wye step down oil type transformer. I believe this configurations is fine but I am getting feedback from the manufacturer that the setup of the step-up...