Abstract
A winding configuration for a transformer or an inductor has a winding formed by a winding conductor, a solid insulation surrounding the winding and a connecting unit embedded in the solid insulation. The aim is to obtain a winding configuration which provides the required dielectric strength even at higher operating voltages. In order to achieve this goal, the connecting unit is a plug lead-through and is configured to allow the connection of a cable connector.
Claims
1. A winding configuration for a transformer or an inductor, the winding configuration comprising: a winding formed from a winding conductor; a solid insulation surrounding said winding; and a connection unit embedded in said solid insulation, said connection unit is a plug-in bushing and is configured for connection to a cable plug; said plug-in bushing having a cable connection socket formed therein; said solid insulation having an outer surface with a receptacle section protruding from said outer surface; said plug-in bushing having a flange section formed from a solid bushing insulation; and said plug-in bushing connected to said receptacle section by said flange section.
2. The winding configuration according to claim 1, wherein said plug-in bushing is standardized.
3. The winding configuration according to claim 1, wherein said plug-in bushing has field control elements, a bushing insulation formed of a solid body and a conductor, said conductor extends through said bushing insulation, said field control elements are embedded in said bushing insulation.
4. The winding configuration according to claim 1, wherein said receptacle section has a cylindrical design.
5. The winding configuration according to claim 1, wherein said plug-in bushing has a connection side and a winding side that faces said solid insulation, wherein said winding side has recesses formed therein.
6. A method for producing a winding configuration for a transformer or an inductor, which comprises the steps of: providing the winding configuration according to claim 1; embedding the winding formed from the winding conductor in the solid insulation; and integrally forming the solid insulation on the plug-in bushing configured for connecting to a cable plug.
7. The method according to claim 6, which further comprises providing the plug-in bushing with recesses on a winding side of the plug-in bushing that faces the solid insulation before being embedded in the solid insulation.
8. The method according to claim 7, which further comprises milling circumferentially closed grooves or channels into the winding side as the recesses.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
(1) 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 of the drawing, wherein identical reference signs refer to identically functioning components and wherein
(2) FIG. 1 shows a perspective view of an exemplary embodiment of the winding arrangement according to the invention,
(3) FIGS. 2 and 3 show a plug-in bushing of the winding arrangement according to FIG. 1 and
(4) FIG. 4 shows a cut-away side view of the plug-in bushing of the bushing according to FIG. 1.
DESCRIPTION OF THE INVENTION
(5) FIG. 1 shows a perspective illustration of an exemplary embodiment of the winding arrangement 1 according to the invention. It can be seen that the winding arrangement 1 has a cylindrical interior 2 for receiving a low-voltage winding and a limb of an iron core of a transformer. The outer casing, or in other words the outer contour, is of substantially cylindrical design, wherein the winding arrangement 1 has a connection side 3, which is flattened in comparison to the cylindrical outer casing. Two receptacle sections 4 project on the connection side 3, which receptacle sections are embodied in a cylindrical manner in the exemplary embodiment shown. The receptacle sections 4 extend at a right angle to a central axis of the cylindrical interior 2 and each serve for receiving a plug-in bushing 5, wherein each plug-in bushing 5 sits on the respective receptacle section 4 by way of a disk-shaped flange section.
(6) FIGS. 2 and 3 show the plug-in bushing 5 in more detail. It can be seen that the plug-in bushings 5 have a cable side 7 and a winding side 8. In this case, the cable side 7 and the winding side 8 are separated from one another by the disk-shaped flange section 6. A column section 9 projects from the disk-shaped flange section 6, which column section is designed in a conical manner or in other words with a frustoconical shape. In this case, the column section 9 surrounds a conductor 10, a threaded connection 11 in the form of an internal thread being formed at the free end of said conductor that faces away from the flange section 6. The column section 9 is embodied with a shape complementary to a standardized cable plug (not illustrated in the figures). The entire bushing is therefore likewise standardized, wherein the standard corresponds, for example, to EN 50181. The standard stipulates, for example, the size of the internal thread, for example M16, and the dimensioning and the type of frustoconical column section. The internal thread 11 serves to fix the cable conductor, which extends within a plug head. The plug head is placed over the column section.
(7) The conductor 10 of the plug-in bushing 5 extends from the cable side 7 centrally through the column section 9 and contact can be made therewith on the winding side 8 by a winding arranged in the solid insulation of the winding arrangement 1. In this case, on the winding side, the conductor 10 projects through a stepped section 12 of the plug-in bushing 5, which stepped section can be seen particularly well in FIG. 3. The stepped section 12 thus has circumferentially closed encircling grooves 13 as recesses, which are used to increase the surface of the plug-in bushing 5 at the winding side 8. An improved materially bonded connection between the plug-in bushing 5 and the solid insulation of the winding arrangement 1 is made possible on account of the increased outer surface of the plug-in bushing 5. Finally, it should be mentioned that the conductor 10 consists of an electrically conductive material, which is completely embedded in a bushing insulation consisting of an insulation material.
(8) The column section 9, the flange section 6 and the winding section 12 therefore consist of a solid bushing insulation material. Field control elements (not illustrated in the figures) are also embedded in the bushing insulation.
(9) FIG. 4 illustrates a preferred exemplary embodiment of the method according to the invention, in which the bushing 5 is integrally formed on the solid insulation of the winding arrangement 1. In the cut-away side view shown, it can be seen that the conductor 10 extends from the cable connection socket 11 through the entire bushing insulation, which consists of an electrically non-conductive material, for example an expedient resin. In this case, the threaded connection 11 is embodied as a cylindrical blind opening.
(10) On the winding side 8, a winding connection 14 in the form of a threaded opening is incorporated into the conductor 10. To prevent high field strengths on the winding conductor 8, a metallic shield arrangement or shield element 15 is mounted. The shield element 15 is electrically conductively connected to the conductor 10.
(11) FIG. 4 furthermore shows a mold 16, which consists of a receptacle section mold 17, which is fixedly connected to the remaining components of the mold 16 by means of connecting means 18. The receptacle section mold 17 is provided on its side that faces away from the fastening means 18 with holding means 19, which comprise a clamping ring 20, which is configured to fixedly clamp the holding means 19 on the receptacle section mold 17. In this case, the clamping ring 20 surrounds the receptacle section mold 17 in a circumferential manner. The clamping ring 20 has a passage opening with an internal thread, which opening engages in each case with a clamping screw 21. The clamping screws 21 extend through clamping brackets 22 and through an abutment 23, wherein the abutment 23 sits on the upper edge of the receptacle section mold 17. The flange section 6 of the plug-in bushing 5 extends between the clamping brackets 22 and the abutment 23 so that the plug-in bushing 5 is fixedly held on the receptacle section mold 17 by rotation of the clamping screws 21. The grooves 13 shown in FIG. 3 have been incorporated into the winding side before the clamping.
(12) After the plug-in bushing 5 is connected to the mold 16 for the solid insulation, as shown in FIG. 4, the winding (not illustrated in the figures) is molded, wherein the liquid insulation material, for example a liquid resin, is cast into the mold 16. The solid insulation is subsequently cured and the clamping means 19 and the mold 16 are removed so that the winding arrangement 1 illustrated is FIG. 1 is provided.
