High voltage capacitive device

1. A high voltage capacitive device comprising:

a non-impregnatable film having a plurality of physically separated regions each defined by a conductive coating provided on the non-impregnatable film,

wherein the non-impregnatable film is wound in a plurality of turns to form a plurality of layers, wherein the regions are arranged in overlapping layers in the radial direction,

wherein the non-impregnatable film forms a dielectric between adjacent layers of the regions, and

wherein the conductive coating of at least some of the regions is provided with a plurality of first radial openings extending through the conductive coating to the non-impregnatable film, which delimits a radial extension of each first radial opening,

wherein each region is encompassed within a boundary comprising axial edge areas, wherein the boundary comprising the axial edge areas is continuously coated in a non-patterned manner,

wherein at least one region is provided with first radial openings forming a first pattern and a plurality of second radial openings extending through the conductive coating to the non-impregnatable film, which delimits a radial extension of each second radial opening, and

wherein the second radial openings forming a second pattern different from the first pattern, wherein the first pattern surrounds the second pattern within the at least one region.

2. The high voltage capacitive device as claimed in claim 1 , wherein the non-impregnatable film has a dielectric side and a conductive coating side, wherein for each turn having a region provided with conductive coating the conductive coating side bears against the dielectric side of another turn of the wound non-impregnatable film.

3. The high voltage capacitive device as claimed in claim 1 , wherein the radially outermost region is continuously coated in a non-patterned manner.

4. The high voltage capacitive device as claimed in claim 1 , wherein the first radial openings have a rounded or polygonal cross-sectional shape.

5. The high voltage capacitive device as claimed in claim 1 , wherein the high voltage capacitive device consists of the wound non-impregnatable film.

6. The high voltage capacitive device as claimed in claim 1 , wherein the second radial openings have a rounded or polygonal cross-sectional shape.

7. The high voltage capacitive device as claimed in claim 1 , wherein the first radial openings are smaller than a radial distance between two adjacent layers of regions provided with a conductive coating.

8. The high voltage capacitive device as claimed in claim 1 , wherein the non-impregnatable film is a polymer film.

9. The high voltage capacitive device as claimed in claim 1 , wherein the conducting coating is a conductive compound.

10. The high voltage capacitive device as claimed in claim 1 , wherein the high voltage capacitive device is one of a condenser bushing, a cable termination, a capacitor and an instrument transformer.

11. The high voltage capacitive device as claimed in claim 1 , wherein a boundary of the at least one region comprises a first boundary and a second boundary, the first pattern comprised within the first boundary and the second pattern comprised within the second boundary; and

wherein the first boundary and the second boundary are continuously coated with the conductive coating in a non-patterned manner.

12. The high voltage capacitive device as claimed in claim 11 , wherein the second boundary is surrounded by the first pattern comprised within the first boundary of the at least one region.

13. 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.

14. The non-impregnatable high voltage capacitive film of claim 13 , wherein the non-impregnatable film has a dielectric side and a conductive coating side, wherein for each turn having a region provided with conductive coating the conductive coating side bears against the dielectric side of another turn of the wound non-impregnatable film.

15. The non-impregnatable high voltage capacitive film of claim 13 , wherein the at least one region comprises a first boundary and a second boundary of the plurality of boundaries, the first pattern comprised within the first boundary and the second pattern comprised within the second boundary; and

wherein the second boundary is surrounded by the first pattern comprised within the first boundary of the at least one region.