Some Thoughts on Charging Phenomena in High-Voltage Insulating Materials

This is a paper on a question that refers to possible deteriorating events below the so-called inception voltage in high voltage insulating materials and systems. Based on past technical literature but also on our experimental work, it seems that charging phenomena take place with possible consequences on electrical insulation. A brief background on this question is given as well as some thoughts on possible relations of events between air insulation and solid insulating materials.