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Hello, i cannot wrap my head around autotransformers. it's just not working. This question is giving me the most trouble. I have a few specific questions. 1. Can anyone explain how the adding and subtracting works? As far as I can see, any of those are possible, but perhaps the least likely is...

You can get a 200A adjustable breaker. I have seen 3200AF/AT breakers (not a standard size). The NEC lets you get away with the next standard size up to 800A rating.

The only thing that i can think of, is it says "single phase transformers" so if you assume single phase, then it's the phase of delta to the phase of wye, and delta is VLL but Wye phase is VLN. This would trip me up too.

The one in the Reference manual just looks like an approximation. I'm getting the same as you, and i don't know what's wrong, except that the reference manual says it's an approximation, and this solution is basically V=IR, but the R is the cable. Seems more intuitive.

Handbook is thin. Some mistakes I hope get corrected beforehand. I am nervous because the power loss diagram for the motors isn't clear / what I studied.