Sensitivity functions of corona loss on HVDC practical power lines: An introduction to optimal design

The similarity comparison method is applied to the study of the corona phenomenon on HVDC transmission lines. Using data already known, the non-dimensional generalized characteristics of corona loss in fair weather are found for unipolar lines, with positive polarity, and bipolar lines. These curves are used to find a new similarity matrix which makes it possible to compute the corona variables, power loss, leakage current and conductance for the planned system, by transforming the known values of the reference system. The generalized curves also make it possible to establish absolute formulae for the corona loss predetermination. From these formulae the corona loss sensitivity functions as regards the electric and geometric parameters of the transmission line, are deduced. These functions are used in a sensitivity analysis and in an introductory study to the technico-economic optimal design of the HVDC power lines.