Can grease on conductors cause the generation of corona?

Grease on conductors can indeed cause the generation of corona. This phenomenon occurs when the electric field around a conductor increases to the point where it ionizes the air surrounding it, leading to the formation of corona discharge. The presence of grease or other contaminants disrupts the smooth surface of the conductor, allowing for higher local electric fields which may enhance the likelihood of corona formation.

In environments where conductors carry high voltage, contaminants such as grease can cause irregularities in the electric field, increasing the risk of corona discharge. However, even in lower voltage situations, grease can create sites where the local electric field strength could reach critical levels, leading to corona as well. Thus, the assertion that grease on conductors can lead to corona discharge is accurate.