Hi, wimbohryo,
as i could understand that you want to shift load from GTG to STG2.
i want to know that,
are you thinking of Switchoff the GTG during low load hours?
Regards,
racookpe, is absolutely right.
you can use a power analyser to collect the actual data of the motors (i.e. Voltage, Current, Harmonics,Power Factor) and then you can compare it with designed data.
Regards,