Plug socket with current transformer

Abstract

An apparatus for connecting an electrical device to a high-voltage power grid with a leadthrough plug-in bushing which has a hollow receiving section which extends in a plug-in direction and is composed of an electrically nonconductive insulating material, wherein a metallic contact part is arranged on a closed end region of the receiving section, which metallic contact part extends through the insulating material of the receiving section or lengthens said receiving section in the direction of the closed end region. The apparatus can be assembled and serviced in a simple, quick and therefore cost-effective manner. The receiving section is equipped with a current sensor which is designed to detect an electric current flowing across the metallic contact part.

Claims

1. An electrical device for connection to a high-voltage power grid, the electrical device comprising: a magnetizable core; at least one winding surrounding a section of said core; a tank filled with an insulating fluid and housing said core and said at least one winding; and an apparatus for connecting the electrical device to the high-voltage power grid, the apparatus including: a leadthrough plug-in bushing with a hollow receiving section that extends in a plug-in direction and is composed of an electrically nonconductive insulating material, said receiving section having a closed end region; a metallic contact part disposed on said closed end region of said receiving section, said metallic contact part extending through said insulating material of said receiving section or lengthening said receiving section in a direction of said closed end region, and said metallic contact part being electrically connected to said at least one winding; and a current sensor disposed at said receiving section for detecting an electric current flowing across said metallic contact part.

2. The electrical device according to claim 1, wherein said current sensor has a circumferentially closed annular section into which said receiving section extends.

3. The electrical device according to claim 2, wherein said receiving section rotationally symmetrical in relation to an axis that extends in the plug-in direction, and wherein said annular section delimits a circular cylinder and is arranged concentrically in relation to said receiving section.

4. The electrical device according to claim 1, which comprises an insulation barrier composed of an electrically nonconductive insulating material arranged between said receiving section and said current sensor.

5. The electrical device according to claim 4, wherein said insulating material of said insulation barrier comprises particleboard and/or plastic.

6. The electrical device according to claim 4, wherein said insulating material of said insulation barrier consists of particleboard and/or plastic.

7. The electrical device according to claim 1, wherein said insulating material comprises particleboard and/or plastic.

8. The electrical device according to claim 1, wherein said insulating material consists of particleboard and/or plastic.

9. The electrical device according to claim 1, which comprises a fastening unit for fastening the apparatus to a tank of the electrical device.

10. The electrical device according to claim 9, wherein said fastening unit is mechanically connected both to said leadthrough plug-in bushing and also to said current transformer.

11. The electrical device according to claim 1, wherein said at least one winding is one of a plurality of windings and each winding is connected to said metallic contact part.

12. The electrical device according to claim 1, wherein said tank comprises a cover and said apparatus is fastened to said cover.

13. The electrical device according to claim 1, wherein said tank forms a receiving dome which protrudes from a wall of said tank, and said apparatus is disposed in said receiving dome.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

(1) FIGS. 1 and 2 each show a schematic side view of an exemplary embodiment of the electrical apparatus according to the invention.

DESCRIPTION OF THE INVENTION

(2) FIG. 1 shows a schematic side view of an exemplary embodiment of the apparatus 1 according to the invention. The apparatus 1 has a leadthrough plug-in bushing 2 which has a bushing flange section 3 and a receiving section 4. The receiving section 4 is conical and hollow on the inside, wherein it is open only on one side and has a closed end region 5. A contact part 6, which is connected to a winding of a transformer by means of a connecting line, not illustrated in the figures, extends through the closed end region 5. The receiving section 4 consists of an electrically nonconductive solid insulating material, for example a plastic. The hollow interior of the receiving section 4 is designed to complement the plug-in end of a high-voltage leadthrough in terms of shape, said high-voltage leadthrough, by way of its high-voltage conductor, making contact with the contact part 6 in the plugged-in state, so that an outdoor connection of the high-voltage leadthrough is electrically connected to said winding.

(3) The bushing flange section 3 of the leadthrough plug-in bushing 2 is fixedly connected to an apparatus flange 7 which is fitted to a closure part 8 of a receiving dome 9. The receiving dome 9 has a lower section 10 of circular-cylindrical design and also an upper section 11, wherein the diameter of the upper section 11, which is likewise of circular-cylindrical design, is larger than the diameter of the lower section 10, so that a shoulder 12 is formed. The shoulder 12 serves to support a current sensor 13 which is schematically indicated by way of its annular section 14 here. The annular section 14 is of ring-like design and surrounds the receiving section 4, which extends concentrically into said annular section, over the full circumference. Therefore, when the high-voltage leadthrough is plugged in, the annular section is arranged concentrically in relation to the current flowing across the leadthrough and the contact part 6.

(4) In the example shown, the annular section 14 is a winding which provides an output signal depending on a current flowing through the magnetic field of said winding. Therefore, a current flowing between the winding and the high-voltage leadthrough can be detected by the current sensor 13.

(5) An insulation barrier 15 is shown between the annular section 14 and the current sensor 13. The insulation barrier 15 is in the form of a circular-cylindrical wall and therefore delimits a hollow-cylindrical interior into which the receiving section 4 extends in a concentric manner. The insulation barrier 15 is mechanically connected to holding elements 16, wherein an upper holding element 16 bears against the closure part 8 of the apparatus 1 and can be connected to said closure part if desired. In the exemplary embodiment shown, a mechanically cohesive composite comprising current sensor 13, insulation barrier 15 and holding elements 16 is shown, said composite being supported on the shoulder 12 of the receiving dome 9. The leadthrough plug-in bushing 2 is not mechanically connected to the current sensor before final assembly of the apparatus 1. Instead, the insertion section 4 is passed through an opening in the cover part 8 and then fastened to said cover part by means of flange 7 after the current sensor 13 is fitted.

(6) The exemplary embodiment illustrated in FIG. 2 corresponds to the greatest possible extent to the exemplary embodiment illustrated in FIG. 1, but with the apparatus 1 not being fitted in a receiving dome of a transformer but rather to a cover 17 of the tank of said transformer. Otherwise, the statements made in respect of FIG. 1 correspondingly apply wherein the cover 17 takes the place of the closure part 8. Furthermore, the upper holding elements are connected to the inner face of the cover 17.