Insulation Solutions for HVAC to HVDC Conversion of a High Voltage Transmission Overhead Line: The L7 Tower Case Study

This paper presents two insulation solutions for an AC to DC power transmission line conversion. The purpose is to maximise active power of both solutions, by maximising voltage. The method includes High Voltage Direct Current (HVDC) scheme selection, insulation dimensioning for HVDC energisation in polluted environments and switching surge overvoltage clearance calculation.