As near as I can tell (no information with the pics) this appears to be India, or perhaps one of India's nearby neighbors (Bangladesh, Pakistan, etc.).
The British distribution system in towns favors one large 3-ph xfmr feeding a 4-wire wye system serving a relatively large area, rather than the larger number of small xfmrs as is common in North America.
So if this was modeled (loosely!) on the British system, there's probably one big transformer somewhere in the neighborhood and it's likely to be anything from 220/380 to 250/433V wye on those poles, probably no HV, but who can tell in that mess?
(It looks as though there is telephone wiring in there as well.)
I heard that at least up until a few years ago some towns in India still had their old 3-wire DC systems in use (200/400 to 250/500V), but I have no idea if that is still the case.