Interconnections of Distributed Energy Resources (DER) have increased to a point where power may flow upstream through utility distribution substation transformers into the regional power grid. Many utilities rely on a lower voltage transmission system, a.k.a. sub-transmission system, to interconnect and distribute power to customers throughout rural areas of their service territory. Many of the DERs are located in these rural areas and are attempting to interconnect to the sub-transmission connected substations.