Reply to thread

some people kapton gap the cores, so that if it does go toward saturation, then it doesnt so suddenly saturate.

There is a way of  "Looking" at the flux excursions by using a "search coil" inside the transformer. Just a very small extra coil wound in there, and have a very small load on it, ...that will show the flux waveform, albeit with the nuisance of having this extra test coil in your transformer.