need to find a way to locate technical literature on high power (several-100s KVA) UPS systems level 3 class redundancy (their technology and especially circuitry) and a way to order it and pay for it
In the IEE Library there is a 1992 book which is a little dated now but set the scene well. I wrote the chapter on high power UPS. Regards, Mike Leach, mleach@iee.org