Insulation Levels of DC Filter Reactors and Resistors for HVDC Power Transmission

This paper concerns the insulation of reactors and resistors in the harmonic filter circuits on the dc side of an HVDC converter station. The cost of these reactors and resistors is greatly dependent on their insulation levels, and could be a substantial part of the total filter costs if their insulation levels are comparable to the insulation level of the dc busbars.