Abstract
A winding unit for connecting to a high-voltage grid or network includes a winding embedded in a solid insulating body and a first main connection terminal connected to a first winding end of the winding and disposed on a first support formed on the insulating body. A second main connection terminal is connected to a second winding end of the winding. The winding has partial windings and taps for adjusting the number of windings of the partial windings connected in series. Outgoing lines extending in the insulating body connect the taps to a tap connection terminal accessible from the outside. The tap connection terminals are formed on the support in order to encapsulate the higher voltage in a resin block over the entire periphery by using a shielding cage.
Claims
1. A winding unit for connecting to a high-voltage grid, the winding unit comprising: a solid insulating body; a first support formed on said insulating body; a second support formed on said insulating body; each of said supports having a rotationally symmetrical configuration and being equipped with ribs; each of said supports extending in a longitudinal direction; a winding embedded in said solid insulating body, said winding having first and second winding ends, and said winding including partial windings having series-connected turns and taps for adjusting a number of said series-connected turns; a first main connection terminal connected to said first winding end of said winding and disposed on said first support; a second main connection terminal connected to said second winding end of said winding; externally-accessible tap connection terminals disposed on said first support, said tap connection terminals each being disposed between two of said ribs and evenly-distributed over a periphery of a respective one of said supports; and outgoing lines extending in said insulating body, said outgoing lines connecting said partial windings to said tap connection terminals.
2. The winding unit according to claim 1, wherein said first main connection terminal is disposed at a free end of said first support.
3. The winding unit according to claim 1, wherein said second support extends from a free end of said insulating body, said second main connection terminal being disposed at said free end of said second support.
4. The winding unit according to claim 3, wherein said insulating body and each of said supports are formed of a cured resin.
5. The winding unit according to claim 1, which further comprises a flexible cap attached to said first support for protecting said tap connection terminals.
Description
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
(1) FIGS. 1 and 2 illustrate a winding unit according to the prior art in an end face view or a sectional side view,
(2) FIGS. 3 and 4 illustrate a winding unit according to the present invention in an end face view or in a sectional side view,
(3) FIGS. 5 and 6 illustrate an exemplary embodiment of a support in a sectional side view or transverse view, and
(4) FIG. 7 illustrates an exemplary embodiment of the winding unit according to the invention, in a perspective view.
DETAILED DESCRIPTION OF THE INVENTION
(5) FIGS. 1 and 2 show a winding unit according to the prior art, of the type which has already been described in detail, such that any further representation can be omitted.
(6) FIG. 3 shows an exemplary embodiment of the winding unit 10 according to the invention, in an end face view. FIG. 4 shows the winding unit according to FIG. 3 in a sectional side view.
(7) The winding unit 10 according to the invention represented in FIGS. 3 and 4 comprises a solid winding body, which is configured as a resin block 11. A winding 12 is embedded in the resin block 11. The winding 12 which, in this case, is configured as a higher-voltage winding 12, further comprises a first partial winding 13 and a second partial winding 14, which are galvanically isolated from one another. The uppermost winding layer of the first partial winding 13 is connected to the first main connection terminal 19 of a support 1 by means of an outgoing line 18. The first main connection terminal 19 is arranged at the free end of the support 1, which is averted from the insulating body 11. The final winding layer of the first partial winding 13—as per the prior art according to FIGS. 1 and 2—is connected by means of an outgoing line 15 to the tap connection terminal 5 which, however, conversely to the winding unit represented in FIG. 1, is configured on the support 1. The same applies correspondingly to the tap connection terminals 3 and 4, which are likewise connected to taps 17 on the first partial winding 13. The first winding layer of the second partial winding 14 is in turn connected by means of an outgoing line 16 to the tap connection terminal 6, which is likewise arranged on the support 1. The same applies correspondingly to the tap connection terminals 7 and 8, which are connected by means of outgoing lines 18 to taps 17 on the second partial winding 14. All the outgoing lines 15, 16 and 18 of the partial winding 13, 14 thus extend through the support 1 to the terminals which are configured thereupon. According to the invention, outgoing lines in the center of the winding 12 and the winding body 11 are eliminated.
(8) The partial windings 13, 14 moreover differ with respect to the number of turns. Whereas, in the winding unit 11 according to FIG. 2, the first partial winding 13 and the second partial winding 14 are virtually identically dimensioned and comprise an approximately equal number of turns, the first partial winding 13 in the exemplary embodiment of the invention represented in FIG. 4 assumes significantly smaller dimensions, and is provided with fewer turns than the second partial winding 14. This provides an advantage, in that it is not necessary for the outgoing lines 15, 16 and 18 to be routed over an unnecessarily long distance, parallel to the winding 12, to the support 1 in the resin block 11, such that the winding unit 10 according to the invention can be configured in a simpler and more cost-effective manner.
(9) In FIG. 4, it can further be seen that the support 1 assumes a rotationally symmetrical configuration and constitutes ribs 22, the function of which is to extend the creepage current path and thus increase dielectric strength. It can moreover be seen that all the tap connection terminals 3, 4, 5, 6, 7 and 8 are commonly arranged between the first and second ribs 23 and 24 of the support 1.
(10) The support 2, at the free end of which the second main connection terminal 20 is located, is also equipped with external ribs 22.
(11) FIG. 5 shows the support 1 with the first main connection terminal 19 in a sectional view, in which only the tap connection terminals 7 and 5 can be seen, which are respectively connected to the final and the first turn of the first partial winding 13. The tap connection terminal 7 is connected by means of the outgoing line 18 to a tap 17 on the second partial winding 14.
(12) FIG. 6 shows the support 1 according to FIG. 5 in an overhead view. In this case, all the tap connection terminals 3, 4, 5, 6, 7 and 8, together with the central connecting line 18 for the first main connection terminal 19, can be seen.
(13) In FIG. 5, it is further shown that the first rib 23 incorporates an under-rib 25, which assumes an approximately equal radius to the second rib 24. The tap connection terminals are arranged below the under-rib 25 and the second rib 24. The second connection rib 24 is configured with a somewhat shorter radial dimension than the remaining ribs 22 of the support 1. The pull-over fitting of a flexible cap onto the second rib 24 and the under-rib 25 is simplified accordingly.
(14) FIG. 7 shows a perspective representation of the winding unit 10, in which it can be seen that the tap connection terminals 3, 4, 5, 6, 7 and 8 are evenly distributed over the periphery of the support 1, and are thus arranged with an equal radial spacing in relation to one another. The second support 2, with the second main connection terminal 20, can moreover be seen. The resin block 11 is further represented, in which a higher-voltage winding and two lower-voltage windings are arranged. The higher-voltage winding is connected on the input side to the main connection terminals 19 and 20, wherein the lower-voltage windings are electrically connected to the lower-voltage terminals 25. The winding body 11 is configured with a central installation opening 26, which is provided for the accommodation of a core limb. The core limb is part of a magnetizable core unit, which extends around the winding body 11 in a crown-shaped arrangement, for the inductive coupling of the windings, although said unit is not diagrammatically represented.
