Corona space charge development for combined alternating and direct voltage excitation

Corona in a coaxial test cage is investigated by tests and simulation for combined alternating and direct voltage excitations. The results of a test program which varied the polarity, magnitude and ratio R of the peak alternating to peak total voltage are examined in detail. Data measured include current, power loss, charge transport and optical output from the corona. A quantitative treatment is given by implementing and adapting an existing alternating current corona model. The improved understanding allows inferences to be made relevant to the performance of full-scale hybrid systems in which alternating and direct voltage circuits are built in close proximity.