Air-Insulated HVDC Transmission Lines Utilizing Concrete Sewer Pipes

Inhalt:
Ensuring a reliable energy supply is crucial in the modern era, with power grid operators grappling with the challenge of meeting escalating electricity demands and adapting to variable energy sources. The connection of offshore wind farms to metropolitan areas over long distances necessitates High Voltage Direct Current (HVDC) technology. However, increasing public sensitivity to overhead transmission lines has led to the installation of expensive HVDC cable connections in some countries. This paper presents a more cost-efficient approach utilizing concrete sewer segments as housing for an HVDC air-insulated line (AIL). Calculations and model-based tests demonstrate not only solid performance but also a significant increase in transmittable power, reaching up to 6 GW per conductor and even more with some simple cooling methods.