On the Generation Functions of DC Corona Performance

Definitions of generation functions of corona loss (CL), radio interference (RI), and audible noise (AN) traditionally used in the evaluation of ac corona performance were found to not be applicable to dc corona. Based on the results of CL calculations in cage and monopolar dc transmission-line configurations, proposals are made for a new definition of CL generation function that includes geometric parameters of the respective conductor configurations. Using published experimental data obtained for the same conductor bundle in two cages with different geometric parameters, it is shown that the same definition can be used for monopolar dc corona generated RI and AN. Calculations also show that the new definition applies to the case of CL from bipolar dc transmission-line configurations. Finally, the possibility and limitations of using cage tests for predicting the CL, RI, and AN performance of bipolar dc transmission lines are examined.