Electrical insulation system
An electrical insulation system for a high voltage inductive device includes a cylindrical insulation barrier defining an axial direction, a longitudinal bar having a main extension in the axial direction, the longitudinal bar arranged to support the cylindrical insulation barrier along the axial direction and to provide spacing in a radial direction, and the longitudinal bar having a first side facing the cylindrical insulation barrier and a second side, opposite the first side, having a groove, and a spacer having a main extension in the radial direction, the spacer being arranged to provide spacing in the axial direction, the spacer having a groove fitting end portion. The longitudinal bar is adapted to receive the groove fitting end portion of the spacer in the groove, and wherein the spacer is dimensioned so relative to the groove that the groove captures any streamer propagating from the spacer towards the cylindrical insulation barrier.
1. An electrical insulation system for a high voltage inductive device, wherein the electrical insulation system comprises:
a cylindrical insulation barrier defining an axial direction,
a longitudinal bar having a main extension in the axial direction, the longitudinal bar being arranged to support the cylindrical insulation barrier along the axial direction and to provide spacing in a radial direction, and the longitudinal bar having a first side facing the cylindrical insulation barrier and a second side, opposite the first side, having a groove, and
a spacer having a main extension in the radial direction, the spacer being arranged to provide spacing in the axial direction, the spacer having a groove fitting end portion,
wherein the longitudinal bar is adapted to receive the groove fitting end portion of the spacer in the groove, and wherein the groove has a mouth, wherein the spacer has a largest width dimension which is smaller than the width of the mouth.
2. The electrical insulation system claimed in claim 1 , wherein the second side of the longitudinal bar has an end face which defines a first plane, and wherein each surface of the spacer immediately following the groove fitting end portion, in a direction towards a central portion of the spacer, defines a plane which intersects the first plane.
3. The electrical insulation system as claimed in claim 1 , wherein the extension of the groove in the axial direction is greater than the thickness of the spacer.
4. The electrical insulation system as claimed in claim 1 , wherein the second side of the longitudinal bar has an end portion at each side of the groove arranged to abut a winding.
5. The electrical insulation system as claimed in claim 1 , wherein the spacer has a body comprising a central portion and the groove fitting end portion, and wherein the groove fitting end portion has a tapering portion tapering in a direction from the central portion to the groove fitting end portion such that the width of the tapering portion becomes narrower the farther away from the central portion.
6. The electrical insulation system as claimed in claim 1 , wherein the groove has a tapering portion in level with the tapering portion of the groove fitting end portion, wherein the tapering portion of the groove is tapering in a direction from the second side of the longitudinal bar towards the first sided of the longitudinal bar.
7. The electrical insulation system as claimed in claim 6 , wherein the tapering portion of the groove and the tapering portion of the groove fitting end portion are tapering with different angles such that a space is formed between each lateral side of the groove fitting end portion and the tapering portion of the groove.
8. The electrical insulation system as claimed in claim 1 , wherein the longitudinal bar is made of a plastic material.
9. The electrical insulation system as claimed in claim 1 , wherein the longitudinal bar is manufactured of a single piece of material.
10. The electrical insulation system as claimed in claim 1 , wherein the longitudinal bar has a first lateral side and a second lateral side, each of the first lateral side and the second lateral side extending between the first side and the second side, wherein each lateral side is provided with ribs.
11. The electrical insulation system as claimed in claim 10 , wherein at least some ribs are perpendicular relative to the lateral side.
12. The electrical insulation system as claimed in claim 10 , wherein at least some of the ribs have an acute angle with a lateral side of the longitudinal bar, the acute angle between each of the at least some of the ribs and the lateral side being formed in the direction from the second side towards the first side.
13. A high voltage inductive device comprising an electrical insulation system as claimed in claim 1 .
14. The high voltage inductive device as claimed in claim 13 , wherein the high voltage inductive device is a power transformer.
15. The high voltage inductive device as claimed in claim 13 , wherein the high voltage inductive device is a reactor.