Unit Substation Engineering and Design Considerations Large Commercial and Industrial Facilities that have received or distributed Medium Voltage (>1,000 Volts) install Unit Substations to provide power at Utilization Voltages (4,160 Volts or <1,000 Volts) for many years. Unit Substations include three major sections: Medium Voltage Disconnect and Transformer Protection Section; the Transformer Section: and the... Read more →