Electrical device having an insertable high-voltage bushing
An insertable high-voltage bushing includes an inner conductor which extends in a longitudinal direction between a high-voltage terminal and a plug-in section of the high-voltage bushing. The plug-in section is configured for the insertion of the high-voltage bushing into a device connection part of an electrical device. An insulating body at least partially extends around the inner conductor. A housing at least partially extends around the outside of insulating body. The housing includes a tubular housing element which extends between a head fitting at the high-voltage terminal of the high-voltage bushing and a mounting flange for fastening the high-voltage bushing to a device housing of the electrical device. The housing element is made of a composite material and a secondary insulation provided between the housing element and the insulating body is formed of a dry foam.
1. An electrical device, comprising:
a fluid-tight housing;
an insertable high-voltage bushing including:
a high-voltage terminal;
a plug-in section configured to plug the high-voltage bushing into a device connection part of an electrical device;
an inner conductor extending in a longitudinal direction between said high-voltage terminal and said plug-in section;
an insulating body at least partially surrounding said inner conductor;
a mounting flange for mounting the high-voltage bushing on a device housing of the electrical device;
a housing at least partially outwardly surrounding said insulating body, said housing including a tubular housing element extending between said high-voltage terminal and said mounting flange, said housing element being formed of a composite material; and
a secondary insulation disposed between said housing element and said insulating body, said secondary insulation including a dry foam;
a device connection part for receiving and contact-connecting said high-voltage bushing;
a fastening section fastening said device connection part to said housing;
a hollow locating section of an electrically non-conductive insulating material extending from said fastening section into said housing; and
a metallic contact part disposed at a closed and tapered end region and extending through said insulating material of said locating section or prolonging said locating section in a direction of said closed end region.
2. The electrical device according to claim 1 , wherein said insulating body incorporates capacitive control inserts being separated from one another by insulating layers, said control inserts being disposed concentrically around said inner conductor and extending into said plug-in section.
3. The electrical device according to claim 2 , wherein said insulating layers include a non-woven fabric.
4. The electrical device according to claim 3 , wherein said non-woven fabric includes a synthetic polymer.
5. The electrical device according to claim 2 , wherein said control inserts are mutually spaced apart by a radial distance of between 1 mm and 3 mm.
6. The electrical device according to claim 1 , wherein said insulating body includes a cured resin.
7. The electrical device according to claim 1 , wherein the high-voltage bushing extends in the longitudinal direction to a length of from 6 m to 30 m.
8. The electrical device according to claim 1 , wherein said inner conductor has a diameter of at least 5 cm.
9. The electrical device according to claim 1 , wherein said plug-in section includes an outer coating of a flexible insulating coating material.
10. The electrical device according to claim 1 , which further comprises a winding connection line extending within said housing for connecting said contact part to a winding.
11. The electrical device according to claim 10 , wherein said winding connection line is equipped with a current sensor.