Utility Pole Transformers: These can be modeled as either Single-Phase or Three-Phase depending on the arrangement of the High-Voltage Bushings and how the Transformer is wired. For Single-Phase you simply remove one of the bushings.
For wiring and other tips see my blog -
Transformers: Electric Power Distribution System, Three-Phase and Single-Phase Transformer Wiring, What are all the bits?, Modeling Utility Pole Transformers and Transformer Bushings