Yep, It's all about core saturation. A large utility
transformer can be saturated by just a few amperes
of DC. Which is one reason improvements in load current
THD are important. Zero sequence currents and all
that jazz.


ken scharf wrote in
:

ken scharf wrote:
For transformers that carry ONLY dc (power, filament) alternate each
lamination so no two in a row go the same way.
I meant for transformers that carry ONLY AC! oops!