Corona can be avoided by minimizing the voltage stress and electric field gradient. This is
accomplished by using utilizing good high voltage design practices, i.e., maximizing the
distance between conductors that have large voltage differentials, using conductors with Page 4
large radii, and avoiding parts that have sharp points or sharp edges. Corona inception
voltage can sometimes be increased by using a surface treatment, such as a semiconductor
layer, high voltage putty or corona dope.
Also, use a good, homogeneous insulator. Void free solids, such as properly prepared
silicone and epoxy potting materials work well. If you are limited to using air as your
insulator, then you are left with geometry as the critical parameter.
Finally, ensure that steps are taken to reduce or eliminate unwanted voltage transients,
which can cause corona to start.
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