MOBILE TRANSFORMER BUSHING CONNECTION

Abstract

An electrical device can be connected to a high-voltage power grid in a flexible and cost-effective manner. There is provided an apparatus with a housing that is filled with an insulating fluid. A high-voltage bushing has a high-voltage conductor that extends through a bushing insulator and is fastened to the housing. Furthermore, a cable connection is provided on the housing in order to connect a high-voltage cable. A connecting conductor which is surrounded by the insulating liquid establishes a direct electrical connection between the cable connection and the high-voltage conductor of the high-voltage bushing in the housing. The high-voltage bushing is therefore no longer inserted into a tank which is filled with oil, but rather is part of a mobile apparatus which is connected to a winding in the tank by way of a cable.

Claims

1-10. (canceled)

11. An apparatus for connecting an electrical device to a high-voltage power grid, the apparatus comprising: a housing filled with an insulating fluid; a high-voltage bushing to be fastened to said housing, said high-voltage bushing having a high-voltage conductor that extends through a bushing insulator; a cable connection disposed on said housing, for connecting a high-voltage cable; and a connecting conductor held in said housing in an insulated relationship and surrounded by said insulating fluid, said connecting conductor connecting said cable connection directly to said high-voltage conductor of said high-voltage bushing.

12. The apparatus according to claim 11, wherein said cable connection is a cable plug-in socket.

13. The apparatus according to claim 11, wherein said high-voltage bushing is electrically connected to said connecting conductor by way of a bushing plug-in socket.

14. The apparatus according to claim 11, wherein said housing is supported on rollers.

15. The apparatus according to claim 11, wherein said insulating fluid is a fluid selected from the group consisting of a mineral oil, a vegetable oil, an ester oil, a synthetic oil and a protective gas.

16. The apparatus according to claim 11, which comprises a shielding electrode and wherein said connecting conductor extends within said shielding electrode at least in sections.

17. The apparatus according to claim 11, which further comprises an expansion vessel fluidically connected with said housing.

18. An electrical device for connection to a high-voltage power grid, the electrical device comprising: a tank filled with an insulating fluid; a magnetizable core and at least one winding that surrounds said core at least in sections disposed in said tank; and an apparatus according to claim 11; wherein said at least one winding is electrically connected to said cable connection of said apparatus.

19. The electrical device according to claim 18, which comprises a device cable connection formed on said tank and a cable connecting said cable connection of said apparatus to said device cable connection on said tank.

20. The electrical device according to claim 18, wherein said at least one winding is one of a plurality of windings and said apparatus is one of a plurality of said apparatus, and wherein each of said windings is connected to a respective said apparatus.

Description

[0020] Further expedient refinements and advantages of the invention are the subject matter of the following description of exemplary embodiments of the invention with reference to the figures in the drawing, wherein identical reference signs refer to identically acting components, and wherein

[0021] FIG. 1 schematically shows a side view of an exemplary embodiment of the apparatus according to the invention and an exemplary embodiment of the electrical device according to the invention, and

[0022] FIG. 2 schematically shows a plan view of the apparatus and the electrical device according to FIG. 1.

[0023] FIG. 1 shows an exemplary embodiment of the apparatus 1 according to the invention and an exemplary embodiment of the electrical device 2 according to the invention. The electrical device 2 is designed as a transformer in FIGS. 1 and 2 and comprises a tank 3 in which windings, not illustrated in the figures, and a magnetizable core are arranged. The core comprises steel sheets and forms limbs which are surrounded by a lower and an upper voltage winding. The limbs are connected to one another by means of an upper and a lower yoke. In order to insulate and cool the windings, the tank 3 is filled with an insulating fluid, for example a mineral oil or an ester oil, wherein an expansion vessel 4 is arranged above the tank 3, said expansion vessel being connected to the interior of the tank so that temperature-related fluctuations in the volume of the insulating fluid can be reliably absorbed by the expansion vessel 4.

[0024] In order to improve cooling, the tank is equipped with cooling fins, not illustrated in the figures. Furthermore, it is possible within the scope of the invention to actively or passively recirculate the insulating fluid by means of a cooling device, likewise not illustrated in the figures.

[0025] The electrical device 2 further has a device cable connection 5 which is arranged above a cover 6 of the tank 3 and forms a dome-like housing 7. A winding connection line which is connected to the upper voltage winding extends from the inside into the dome-like housing 7 and there is connected to the insertion section of a cable 8. The device cable connection 5 ensures the electrical connection of the insulated internal conductor of the cable 8 to one of the windings of the transformer 2. The cable 8 extends from the device cable connection 5 to a plug-in end 9 which is inserted into a cable plug-in bushing 10 of the apparatus 1. The cable bushing 10 is mechanically fastened to a housing 12 of the apparatus 1 by way of a cable fastening section 11. A cable insertion section 27 which is composed of insulating material extends from the cable fastening section 11 to a cable end contact 13 which is connected to a high-voltage conductor 15 of a high-voltage bushing 16 by means of an electrically conductive connecting conductor 28 which extends within a shielding electrode 14, wherein the high-voltage conductor 15 extends through an electrically nonconductive bushing insulator 17. The bushing insulator 17 is surrounded by a fastening section 18 which is of ring-like design and which forms a flange 19 by way of which the fastening section 18 and therefore the entire high-voltage bushing 16 are fixedly fitted to the housing 12.

[0026] The housing 12, which is hollow on the inside, has a substructure which is in the form of a box here and which is adjoined by a circular-cylindrical bushing extension 20. However, in principle, the configuration of the housing can be chosen as desired within the scope of the invention. Furthermore, an optional shielding ring 21 for reducing the electrical field strengths which are produced during operation of the electrical device 2 is shown in this exemplary embodiment. At that end which is remote from the housing 12, the high-voltage bushing 16 has an outdoor connection 22 which is provided for connection of an air-insulated high-voltage conductor. The housing 12 of the apparatus 1 is filled with an insulating fluid, for example a mineral oil, an ester oil, a vegetable oil or the like, which provides the required insulation between the housing 12, which is at ground potential, and the components to which high voltage is applied during operation, such as the outdoor connection 22, the high-voltage conductor 15, the connecting conductor 28, the shielding electrode, the contact part 13 and the internal conductor of the cable 8.

[0027] The housing 12 is further supported on a roller carriage 23 which has rollers 25 which roll on a floor surface 24. The entire apparatus 1 is therefore supported on the floor 24 by means of the rollers 25 and can therefore be easily moved. On account of the cable connection between the apparatus 1 and the tank 3, it is necessary to maintain only a minimum distance between the outdoor connection 22 and components at ground potential. The cable 8 expediently comprises an internal conductor which is sheathed by an electrically insulating solid.

[0028] In order to facilitate fitting, the housing 12 is provided with a fitting opening 26 which can be opened if required in order to grant access to the interior of the housing 12.

[0029] FIG. 2 shows a plan view of the electrical device 2 and the apparatus 1 according to FIG. 1. Said figure shows that the transformer 2 is of three-phase design and has three cable connections 5, wherein the cable 8 which is inserted into the bushing cable connection 5 is in each case electrically connected to a winding of the transformer 2.

[0030] An apparatus 1 is provided for each bushing cable connection 5. The apparatus 1 and the electrical device 2 according to the invention can therefore be easily transported and quickly fitted on site.