MV / LV transformer substations are designed to operate internally or externally according to the used switchgears and LV Panels types and sizes. Each substation consists of an MV compartment, transformer compartment, and LV compartment. In addition to that, the transformer substation may include the MV switchgears only as the transformer substations compartments could be more or less and according to the requirements. These substations could be manufactured as monoblock concrete, prefabricated concrete, metal-galvanized sheet, or aluminum sheet material. C35 class self-compacting concrete is used in the concrete transformer substations, while, 2 mm thick 275 g / m² galvanized steel sheets are used for the doors, ventilation, and sheets in the metallic transformer substations.