Apologies in advance for being off topic, but, is three phase power common in residential settings outside the US?
Within the US I have very rarely seen three phase outside of commercial settings. Some extremely large houses or farms may have it for running large motors or farm machinery, etc. but almost all residential power is 1 phase 2 pole (i.e. one 240V phase split into two 120V poles from a center tapped transformer, with a ground bonded neutral).
I looked into bringing 3ph 480V to my property which astounded the local electricians and permitting folks, despite the property being quite rural. The reasoning was to be able to take advantage of surplus 3ph generators for backup power (with a decent transfer switch, of course), and to reuse the existing buried utility feed without having to replace it with large gauge wire.
After the steam stopped blowing from their ears it worked out to that the 480V had to stay outside on a pad mount transformer and it had to be stepped down to 208V wye entering any residential structure. I think I eventually found the National Electrical Code justification for that. However I do see a lot of talk about residential three phase and sometimes higher voltages as well, in other countries.
In regards to the original topic, since the goal is data logging, have you looked into installing ModBus enabled 3 phase power meters or branch circuit monitoring? Schneider Electric, for example, makes a variety of models for such things. The ModBus interface is fairly easy to gather data from on your own (RS-485 serial and can be gatewayed to IP/Ethernet).