THE RELATIONSHIP of corona discharge current to
corona onset voltage can manifest some corona characteristic
of the test object. The basic mechanisms of corona
discharge phenomena can be obtained by measuring the corona
current from the high-voltage side and analyzing its relationship
with corona discharge. The corona current is difficult to reliably
and accurately measure, however, with the conventional current
measuring method because of the weak signal (i.e., in the
microampere level), wide bandwidth, and high-voltage stresses.