Mobile substations are fully equipped electrical substations mounted on semi-trailers. Rapid integration into the network and the ability to use them at various locations are the most important advantages of these mobile substations. Mobile substations are used in emergency situations, as a temporary solution for the supply of electric power or as substitutes for air insulated or gas insulated substations. In combination with the application of Hybrid or Nomex® insulation in the mobile transformer, the mobile substation is able to handle power ratings up to 80 MVA and 245 kV.