High-voltage bushing
View Patent ↗An exemplary high-voltage bushing has a conductor and a core surrounding the conductor, wherein the core includes a sheet-like spacer, which spacer is impregnated with an electrically insulating matrix material. The spacer can have a multitude of holes that are fillable with the matrix material. The spacer can be net-shaped or meshed. It can be a net of fibers. The bushing can be a fine-graded bushing with equalizing plates within the core. As a matrix material, a particle-filled resin can be used.
1. A bushing comprising:
a conductor; and
a core surrounding the conductor, the core comprising a spacer in sheet form, said spacer is impregnated with an electrically insulating matrix material, and is wound, in spiral form, so that the spacer includes plural neighboring layers, wherein the spacer is net-shaped or meshed and comprises plural interwoven fibers and has plural holes that are filled with the matrix material.
2. The bushing according to claim 1 , wherein the spacer is wound around an axis, that is defined by the shape of the conductor, and wherein plural equalization plates of conductive, metallic or semiconducting material are provided in the core at radial distances from the axis.
3. The bushing according to claim 2 , wherein the as equalization plates are formed through fibers of the spacer, which are at least partially conductive, metallic, or semiconducting.
4. The bushing according to claim 3 , wherein the axis equalization plates are formed by applying a metallic or semiconducting material to the spacer.
5. The bushing according to claim 1 , wherein the spacer is at least one of coated surface treated to form an adhesive surface between the spacer and the matrix material.
6. The bushing according to claim 1 , wherein the spacer is wound around an axis, said axis is defined through the shape of the conductor, and wherein a size of holes in the spacer varies along at least one of a direction parallel to the axis along a, direction perpendicular to that direction.
7. The bushing according to claim 1 , wherein the matrix material comprises filler particles.
8. The bushing according to claim 7 , wherein the filler particles are electrically insulating or semiconducting.
9. The bushing according to claim 8 , wherein at least one of a thermal conductivity of the filler particles is higher than a thermal conductivity of the polymer, and/or wherein a coefficient of thermal expansion of the filler particles is smaller than a coefficient of thermal expansion of the polymer.
10. A high-voltage apparatus or a generator, comprising:
a bushing according to claim 1 .
11. The bushing according to claim 1 , wherein the spacer comprises plural fibers.
12. The bushing according to claim 11 , wherein the spacer is wound around an axis, which axis is defined through a shape of the conductor, and wherein axis equalization plates of conductive, metallic, or semiconducting material are provided in the core at radial distances from the axis.
13. The bushing according to claim 12 , wherein the axis equalization plates are formed through fibers of the spacer, which are at least partially conductive, metallic, or semiconducting.
14. The bushing according to claim 13 , wherein the spacer is at least one of coated and surface treated to form an adhesive surface between the spacer and the matrix material.
15. The bushing according to claim 14 , wherein the matrix material comprises filler particles.
16. The bushing according to claim 15 , wherein at least one of a thermal conductivity of the filler particles is higher than a thermal conductivity of the polymer, and a coefficient of thermal expansion of the filler particles is smaller than a coefficient of thermal expansion of the polymer.
17. The bushing according to claim 1 , wherein the spacer has a grid of openings.
18. The bushing according to claim 17 , wherein the grid and the distribution of openings are uniform.
19. The bushing according to claim 1 , wherein in a cross section of the spacer wound in spiral form fiber bundles and holes between these are visible.
20. The bushing according to claim 1 , wherein plural channels are formed and extend radially from one side of the spacer winding to another side of the spacer winding through an overlap of holes between neighboring layers within the core, wherein the channels guide the matrix material through the core.