161-69kV Substation

To meet growing capacity and load support needs in the southeastern portion of an electric power cooperative client’s territory, a new substation was constructed on the 69 kV system. The solution involved tapping a utility’s existing 161 kV transmission line with a 30/40/50 MVA 161/69 kV substation.

Allgeier Martin designed a straightforward 161 kV bus with three breakers serving both line terminals and the distribution power transformer. The 69 kV bus employed a main-transfer bus configuration to support line terminals and the transfer bus breaker. Design efforts followed the Utility’s standards for high-voltage yard construction. Protection schemes, relay panel layouts, and SCADA integration were developed to meet client requirements. The control building was configured with a duplex panel lineup for the client cooperative and neighboring cooperatives, plus a simplex panel lineup for the Utility.