Enterprise Substation

The Enterprise Substation was designed and constructed to connect a 34.5kV Collector System from the SunEdison owned 80MW Enterprise Solar Project in Iron County, Utah, and provides a path to market for the new solar project. As part of an Engineer-Procure-Construct (EPC) team, M&S Engineering design teams provided all engineering design associated with the new substation.

The project consisted of an open air substation with one (1) 138/34.5 kV, 53/71/89 MVA, main power transformer, one (1) high side breaker, two (2) feeder breakers, one (1) capacitor bank breaker, protective devices, and other apparatuses as required by the interconnecting agreement. Provisions for a spare 138/34.5 kV, 53/71/89 MVA, main power transformer located at the Enterprise Substation was installed for long term storage on site within the substation fence and was set on a dedicated foundation with secondary oil containment. Both transformers are equipped with load tap changers. A 9.7 MVAR capacitor bank was also installed. M&S Engineering provided detailed design for all civil, structural, electrical, foundations, and system protection coordination review with relay settings. Power flow, short circuit analysis, protection coordination, arc-flash, harmonic analysis and other complex studies, such as transient overvoltage (TOV), capacitor switching, and Ferro-resonance studies were performed by Electric Power Engineers via subcontract. SCADA design, integration and commissioning was performed via subcontract by Sebesta, Inc.

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