### Preliminary Checks - [x] I have searched existing issues for a duplicate feature request and I'm sure this is new. - [x] I have read and followed [the docs](https://nrel-distribution-suites.github.io/grid-data-models) and still think this is missing. ### Description Three single phase transformers appear as three edges in tge graph. Cadet requires a single three-phase model instead
Preliminary Checks
Description
Three single phase transformers appear as three edges in tge graph. Cadet requires a single three-phase model instead