Quite interesting that they use a 270v dc bus for some systems and shows just how much power is consumed. For equivalent Kva, increasing the rail voltage decreases the current, which allows thinner cable to be used, saving weight.
Introduces a whole lot of problems for the designers athough and not something you would want to get your hands on :-(...
That 270vDC is actually a variable square wave AC. Boeing call it +/-270vDC. It's used to power the big motors. CACs, Engine Starters, pumps etc. It saves a lot of energy overall as it allows hydraulic pumps and such to be 'throttled' as required. Creates a load of heat though during the transforming which is why the boxes that do it are liquid cooled.
