High voltage bushing
View Patent ↗A high voltage bushing including a metal part provided with a resistive layer.
1. A high voltage bushing comprising:
a high voltage conductor provided in a gas filled hollow insulator housing;
a voltage grading shield comprising a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, and
a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises aluminum oxide.
2. A high voltage bushing comprising:
a high voltage conductor provided in a gas filled hollow insulator housing;
a voltage grading shield comprising a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, and
a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises a ceramic material.
3. A high voltage bushing comprising:
a high voltage conductor provided in a gas filled hollow insulator housing;
a voltage grading shield comprising a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, and
a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises a polymeric base material that is any of epoxy, polyurethane, and Teflon.
4. A high voltage device, comprising:
a high voltage bushing comprising a high voltage conductor provided in a gas filled hollow insulator housing, a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises aluminum oxide.
5. The high voltage bushing according to claim 1 , wherein the voltage grading shield comprises aluminum and the layer comprises anodized aluminum.
6. A high voltage device, comprising:
a high voltage bushing comprising a high voltage conductor provided in a gas filled hollow insulator housing, a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises a ceramic material.
7. A high voltage device, comprising:
a high voltage bushing comprising a high voltage conductor provided in a gas filled hollow insulator housing, a cylindrical metal part provided in the insulator housing, surrounding and extending along the high voltage conductor, a layer having a resistivity in a range of 10 8 -10 14 Ωm provided only on a surface of lengthwise end portions of the metal part, wherein the layer has a thickness in a range of 10-1000 μm, the layer permitting slow and controlled partial discharge of particles hitting a surface of the layer, wherein the layer comprises a polymeric base material that is any of epoxy, polyurethane, and Teflon.