Generation substations increase the generated voltage for efficient long-distance transmission, transmission and sub-transmission substations control power flow between different voltage levels, and distribution substations reduce the voltage for residential, commercial . Generation substations increase the generated voltage for efficient long-distance transmission, transmission and sub-transmission substations control power flow between different voltage levels, and distribution substations reduce the voltage for residential, commercial . A substation is a part of an electrical generation, transmission, and distribution system. Substations transform voltage from high to low, or the reverse, or perform any of several other important functions. It is used to switch generators, equipment, and circuits or lines in and out of a system. It also is used to change AC voltages from one level to another, and/or change alternating current to direct current or direct current to alternating. Electric Power Generation, Transmission, and Distribution Edited by Leonard L. They maintain the stability and security of the grid by monitoring and managing power flows. A substation has protection devices that safeguard the. What are Grid Stations? A grid station is a large, high-voltage facility that serves as a major connection point between transmission networks, enabling the transfer of bulk electricity over long distances.