High voltage capacitive device

A non-impregnatable high voltage capacitive film configured to be wound in a plurality of turns to form a plurality of layers, the non-impregnatable high voltage capacitive film comprising:

• a plurality of physically separated regions each defined by a conductive coating provided on the non-impregnatable film, wherein the plurality of physically separated regions are arranged in overlapping layers in the radial direction and the non-impregnatable film forms a dielectric between adjacent layers of the regions when the non-impregnatable high voltage capacitive film is wound;
• a plurality of first radial openings extending through the conductive coating of at least some of the regions provided on the non-impregnatable film, which delimits a radial extension of each first radial opening;
• a plurality of boundaries each encompassing a region of the plurality of physically separate regions, wherein each boundary comprises axial edge areas, wherein each boundary comprising the axial edge areas is continuously coated in a non-patterned manner;
• a plurality of second radial openings extending through the conductive coating to the non-impregnatable film, wherein the non-impregnatable film delimits a radial extension of each second radial opening, wherein the first radial openings of a region form a first pattern and the second radial openings form a second pattern different from the first pattern;
• and
• wherein at least one region of the plurality of regions comprises the first radial openings forming the first pattern and with the second radial openings forming the second pattern, wherein the first pattern surrounds the second pattern within the at least one region.