Abstract: A compact indoor power distribution substation employs ambient-air-insulated high-voltage components, in lieu of gas-insulated components, for the distribution at 36 kV or less of electrical power from 60 kV to 245 kV high-voltage incoming lines. The substation is contained in a rectangular building having a ground floor and a cross-shaped upper floor.

Abstract: Disclosed is a power distribution substation for power distribution to a consumption pool having a high voltage unit divided into cells, each cell containing high voltage incoming connection equipments connected by high voltage cables to a power source having a voltage between 60 kV and 245 kV. The substation also has a transformers yard having at least one transformer connected to the high voltage incoming connection equipments, and a mid-voltage unit containing outgoing connection equipments connected to the transformer and linked to output power lines for power distribution under a voltage lower than or equal to 36 kV. Finally, the substation has a control room. The high voltage and mid-voltage units, the transformers yard and the control room are located in a single building having a roof where the high voltage incoming connection equipments, the transformer(s) and some of the outgoing connection equipments ate located at the same level inside the building.