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Siemens to retrofit Daxlanden substation in Germany

Nov 18, 2019
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Posted by Patrick Haddad

German transmission grid operator TransnetBW has commissioned Siemens to build new switchgear in the 380 kilovolt (kV) Daxlanden substation in Karlsruhe, Baden-Württemberg.

Two new gas-insulated indoor switchgear, initially with 26 panels, will boost the substation’s transmission capacity and cover the increased transport demand in the German high-voltage grid as a result of the transition to a new energy mix.

In the future, it will thus be possible to transport large quantities of wind energy from northern Germany to the southern part of the country. Replacing sulfur hexafluoride (SF6) with treated air, so-called Clean Air, as the insulating medium in the bus ducts simultaneously ensures much more climate-friendly operation.

During operation, the 400 kV outdoor switchgear with 20 panels will be gradually stripped down in the coming years. In its place, Siemens will build two gas-insulated switchgear (GIS) with 14 and 12 panels during the first expansion stage and 18 and 15 panels, respectively, in the final stage in Karlsruhe. They will more adequately meet the space requirements and simultaneously increase the transmission capacity.

The GIS systems are designed specifically to meet the customer’s special availability and accessibility specifications. The order includes the planning, production, supply, and commissioning of initially 26 switchpanels for the two 8DQ1 GIS systems with triple busbars and single-phase Clean Air bus ducts measuring a total of 3,860 meters in length, and the associated infrastructure equipment. Overall, single-phase bus ducts measuring a total of 5,330 meters in length will be installed.

“We are preparing the substation for the requirements of the energy transition. It will become TransnetBW’s largest network node and one of the largest in Europe. So it will be key to national and international power transit from the north to the south and to local supply in the Karlsruhe region”, says Dr Werner Götz, CEO of TransnetBW. “With our experienced partner Siemens, we have chosen an environmentally friendly solution that will set standards for the future of energy in Germany.”

The commissioning of the turnkey solution will take place in stages and be completed in 2029. The order is priced in the low triple-digit millions range.

Source: Siemens

Photo (for illustrative purposes): Siemens / With Permission

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