Siemens is set to supply two mobile substations to Saudi Arabia’s transmission system operator after winning the order from the Saudi Electric Company’s National Grid SA.
The units have a power capacity of up to 502 MVA, making them “the most powerful ever built on a single feeder configuration” according to Siemens. Each substation contains three single-phase autotransformers with a capacity of 167.3 MVA, which makes them the largest transformers for mobile substations Siemens has built to date.
Each mobile substation also contains GIS switchgears, MV/HV cable drums, protection and control systems and auxiliary power supplies. According to Siemens, built-in rotating air bushings mean installation and connection of the units can take place in less than a week and can be carried out with no OEM services.
“The National Grid SA-Specified mobile substations configuration, jointly customized with Siemens, will allow us to bypass any 380 kV substation in the event of failure or major maintenance work,” said Ali S Al-Rammah, vice-president of National Grid SA and head of the company’s maintenance business line.
“They can also be used as fast-track solutions to connect a new plant to the grid,” he added. “It has been essential to develop a customized technical specification for us to have a plug-and-play solution that we could quickly mobilize and install on our own. It will significantly improve the 380-kV and 132-kV grid resiliency that are the backbone of our power transmission infrastructure.”