Sparky,
A SDS has nothing to do with creating a neutral. You can have SDS systems without neutrals. A SDS is a power source that does not share a circuit conductor with any other power source. A transformer is a SDS because there is no physical connection between the primary and secondary circuit conductors. An autotransformer is not a SDS because there is a conductor common to both the primary and secondary side of the transformer.
Don(resqcapt19)
