Development of a Methodology for Calculation and Assessment of the Interference of HVDC Cables on parallel buried Infrastructures

Abstract:
To achieve the goal of climate neutrality in Germany, the transport routes for renewable energy from north to south must continue to be expanded. The energy transmission will primarily be realized in the form of 525 kV HVDC systems, allowing for nearly loss-free transmission over long distances. Although DC technology, particularly when using under-ground cables (HVDC cables), does not cause electromagnetic interference during normal operation, it can still influence parallel metallic infrastructures under fault conditions. This paper discusses a methodology for calculation and assessment of the inductive interference of HVDC cable systems on parallel buried infrastructures. The developed methodology describes how such interference can be calculated and explains how to evaluate calculated results according to the safety standards of IEC 60479. Sample calculations of planned HVDC systems are presented and discussed.