What connection are the transformers?
Are those boxes on the LV fuses?
Generally, the primary side (HV) will be Delta connected, the Secondary side (LV) will be Star connected.
By the looks of things, the two black boxes on the left pole are triple pole LV fuse-switches, when you open them up, it cuts power to the load side of the fuses.
The HV side is fused by DDO type expulsion fuses seen on that intermediate cross-arm as part of the vertical air-break switch.
