Generator Step-Up Transformer

The generator step-up (GSU) transformer provides the interface between the generator output at "medium" voltage (13,800 V) to the electric transmission grid at "high" voltage (115,000 Volts). GSU transformers are a part of any large-scale generation plant. In the OPEN100 design, one GSU handles all the power exported from the generator to the power grid and, when the turbine-generator is offline, supplies power from the grid to the loads within the plant.