Corona Cutting & Application of Corona Rings

Corona Cutting

Corona cutting can occur on transmission composite insulators(usually 115 kV/138 kV and above systems) that do not have proper corona protection. Corona cutting starts out as small incisions that can eventually lead to splitting of the polymeric housing that further deteriorates the housing and can eventually even expose the fiberglass core.

Application of Corona Rings

Utilities worldwide have increasingly come to realize the need for corona rings on composite insulation, even as low as 115 kV & 138 kV voltage levels, to ensure such insulators are kept free of dry weather corona. The corona ring is to be installed on the end of composite insulators. One or two rings are needed according to the rated voltage of the transmission line.