In Germany, it is a political objective to advance the grid expansion by installing underground cables. The Federal Government – and also the four German transmission system operators (TSOs) – hope by this means to increase public acceptance of the high-performance power lines needed to transmit electricity from the windy north of the country to the consumption-intensive south and west. But what the resident population may welcome, unsettles those through whose land the underground routes run, especially owners and cultivators of agricultural land.
The Dutch-German TSCNET shareholder TenneT itself would like to learn more about possible impacts of underground cabling on agriculture, for example in terms of soil physics or groundwater quality. The TSO has thus entered into a research cooperation with the Georg-August-University Göttingen. Together with members of the Departments of Agricultural Soil Science as well as Agricultural Economics and Rural Development, subsection Agribusiness Management, the long-term effects of three-phase underground cables on agricultural land will be investigated over a period of six years. For this purpose, a 2500m² test field for the construction and operation of 380kV underground cables is being set up at the Reinshof test farm near Göttingen in the German state of Lower Saxony.
The research partners hope to draw concrete conclusions from the test results for the construction of extra-high voltage underground cable routes as well as recommendations for recultivation measures. For these purposes, the operation of underground cables is simulated on the test field. Empty conduits are heated through heating tapes so that their thermal characteristics correspond to the power loss of real 380kV three-phase underground cables. In addition, the effects of the construction works are investigated. In this context, it is also of interest how long it takes until the original soil condition is restored.