Through Gearlever-
Never heard of square wave DC. These devices that convert the 235V AC variable frequency to "square wave" DC.......what exactly are they? Are they solid state or do they have moving parts? If they get hot enough where they need liquid cooling, then there certainly must be a lot of waste doing the conversion of 235V AC to 270V DC.
I've googled around and found some stuff on the 787 electrics, similar to what gearlever linked (thanks gearlever). Was just wondering if your instructors or manuals had better "insights" to the magic than ours. Our training seems to be transitioning from "build the system" 30 years ago, to now "teach them the minimum." The pendulum has swung to far.
I can't even get a decent 787 electrical schematic. If you guys have one, pass it along!