Siemens has been awarded a contract to supply two mobile substations to National Grid SA, the transmission operator of Saudi Electricity Company. Basing its work on unique specifications from National Grid SA, Siemens has combined its existing substation modules to create two 380kV mobile substations able to fit into any network area of the kingdom. they will be mounted on a special trailer and can be transported wherever needed. With a rating of 502 MVA, they will be the most powerful ever built in a single feeder configuration. They contain three single-phase autotransformers each with a capacity of 167.3 MVA, which makes them the largest transformers for mobile substations ever built at Siemens.
Thanks to their built-in rotating air bushings, installation and connection time is reduced to less than one week and can be executed with no equipment manufacturer services. Mobile substations are a versatile solution for emergency power restoration or fast-track grid connection that also guarantees reliability. They can support heavy maintenance or renovation work as an interim bypass substation to reduce or eliminate power outages. They come fully preconfigured and tested as plug-and-play substations that can be connected to the grid by overhead line or insulated cables. The modules contain all the necessary components for a complete substation: power transformers, GIS switchgears, MV/HV cable drums, protection and control systems, and auxiliary power supplies.