If memory serves the CSD oil temp rise is an indication that the CSD (s) are sharing the load. If one is 'working harder' the oil temp rise will be greater. (Also the oil level might be low!)
The KVAR reading as HOT DOG points out is the Reactive load and gives an indication of the performance of the GCU (generator control unit). On pushing the (KVAR) button they should all read the same (+/- 5 KVAR?), if not, one or another of the generators is being back driven.
The real current is controlled by the CSD and the reactive current by the voltage regulator (GCU) as they are 3 phase generators it's to do with line to line voltages across the phases, and (very
)basically a generator with a higher reactive load will have it's excitation lowered and a generator with a lower excitation will have it's excitation raised until it's all back in balance.
maybe an avioncs person could explain it better???