Yes, actually this is why I want to de-magnetize, I was doing the Doble tests on the transformer, and I didnt get the characteristic High-Low-High on my excitation test, so Doble recommended I de-magnetize the transformer and try again. Thanks
I have never demagnitized a Power transformer but I have demagnitized CT's by doing just what Reactorman said. Ramp up voltage to the transformer and then ramp it back down to zero. When I do this with CT's I usually do it during the excitation test. I ramp up the voltage on the secondarys until the CT saturates and then I ramp the voltage back down to zero to demagnitize it.