Abstract
An electric device for connection to a high voltage includes an active part having a magnetizable core and at least one winding arrangement, each surrounding a core section of the core and having windings inductively coupled together, forming cooling channels in the windings. A boiler is filled with insulating fluid and the active part is completely disposed therein. The boiler has at least one insulating fluid inlet and at least one insulating fluid outlet interconnected by a circulation system outside of the boiler having a cooling unit and a pump for circulating the insulating fluid. The electric device has improved cooling achieved by each insulating fluid inlet being connected to a distributing unit, which is disposed on one of the end sides of the winding assembly, via an insulating fluid line extending in the boiler, the distributing unit distributing cooled insulating fluid to the cooling channels.
Claims
1-10. (canceled)
11. An electric device for connection to a high voltage, the electric device comprising: an active part having a magnetizable core with a core section and at least one winding arrangement surrounding said core section, said at least one winding arrangement having end sides and having windings coupled inductively to one another, said windings having cooling channels formed therein; a boiler filled with an insulating fluid, said boiler completely enclosing said active part, said boiler having at least one insulating fluid inlet and at least one insulating fluid outlet; a circulation system interconnecting said at least one insulating fluid inlet and said at least one insulating fluid outlet, said circulation system disposed outside said boiler and including a cooling unit and a pump for circulating the insulating fluid; a distribution unit disposed at one of said end sides of said winding arrangement for distributing cooled insulating fluid to said cooling channels; and an insulating fluid line extending in said boiler and connecting said at least one insulating fluid inlet to said distribution unit.
12. The electric device according to claim 11, wherein said insulating fluid line is a piece of tubing.
13. The electric device according to claim 11, wherein said insulating fluid line has an outlet orifice, said distribution unit has an intake unit with a front side facing said at least one insulating fluid inlet, said intake unit has a through opening configured to receive said outlet orifice, and said intake unit has a rear side provided with inner grooves.
14. The electric device according to claim 13, wherein said grooves have an annular shape and are connected to said through opening.
15. The electric device according to claim 13, wherein said distribution unit has a perforated plate bearing against said rear side of said intake unit, said distribution unit has through bores, and said distribution unit is fitted with spacers on a side of said distribution unit facing away from said intake unit.
16. The electric device according to claim 15, which further comprises an outer sealing ring, said perforated plate, said spacers and said outer sealing ring delimiting distribution cavities each connected to at least one of said cooling channels.
17. The electric device according to claim 16, wherein said intake unit and said perforated plate are disks.
18. The electric device according to claim 11, wherein said distribution unit has a circular outer contour in a plan view.
19. The electric device according to claim 11, wherein said distribution unit is formed of an electrically non-conductive material.
20. The electric device according to claim 11, wherein said boiler has two metal end covers, and a central part formed of an electrically non-conductive material extends between said two metal end covers.
Description
[0029] Further expedient configurations and advantages of the invention are the subject of the following description of exemplary embodiments of the invention with reference to the Figures in the drawings, wherein the same reference signs refer to components that act in the same way, and wherein
[0030] FIG. 1 illustrates an exemplary embodiment of the electric device according to the invention in a perspective illustration,
[0031] FIG. 2 illustrates the electric device according to FIG. 1 with no circulation system and support frame.
[0032] FIG. 3 illustrates the electric device according to FIG. 2 with an insulating fluid line indicated,
[0033] FIGS. 4 and 5 illustrate the front and rear side of an intake unit of a distribution unit in a perspective illustration,
[0034] FIG. 6 illustrates the rear side of a perforated plate in a perspective illustration,
[0035] FIG. 7 illustrates the end side of a winding arrangement in a plan view, and
[0036] FIG. 8 illustrates an exemplary embodiment of a distribution unit in a side view.
[0037] FIG. 1 shows an exemplary embodiment of the electric device 1 in a perspective illustration; the electric device illustrated there is configured as a traction transformer 1. The traction transformer 1 has a boiler 2 which consists of a central part 3 and two end covers 4 and 5. The end covers 4 and 5 are made from steel, whereas the central part 3 is manufactured from a fiberglass-reinforced plastic. An active part, not illustrated representationally, is arranged in the boiler 2, wherein the boiler is filled with an insulating fluid. The active part comprises a magnetizable iron core which has two core limbs which are connected to each other via an upper and lower yoke. Each core limb is surrounded by a winding arrangement, wherein each winding arrangement consists of an inner undervoltage winding and an outer overvoltage winding. The winding arrangement moreover comprises an auxiliary winding. The upper, lower, and auxiliary windings are arranged as an axial extension of the undervoltage winding concentrically with one another and relative to the core limb which passes through the inside of these windings.
[0038] The central part 3 forms two housing tubes 6 and 7 which each surround one of the winding arrangements. The lower and upper yoke are arranged in the upper 4 and lower end cover 5. An input bushing 8 serves to connect the overvoltage windings, connected to each other in parallel, to the high-voltage overhead wire. The undervoltage winding is connected on the output side to cable-connection sockets 9. The desired traction voltage can be taken off by introducing suitable cable plugs into the respective cable-connection socket 9.
[0039] The end cover 4 has two insulating fluid inlets 10, whereas the end cover 5 is equipped with an insulating fluid outlet 11. Lastly, a circulation system 12 can be seen which, in addition to a pump 13, comprises a cooling unit 14 which is equipped with a heat exchanger for cooling the circulated insulating fluid. The circulation system 12 moreover has a pipe 15. Heated insulating fluid is drawn out of the insulating fluid outlet 11 with the aid of the circulation system 12 and fed to the heat exchanger of the cooling unit 14 via the tubing 15. From there, the cooled insulating fluid passes to the insulating fluid inlets 10 in order to be introduced there back into the boiler 2.
[0040] The traction transformer 1 moreover has a support frame 16, for mounting on a rail vehicle, but there is no need to go into further detail about this at this point.
[0041] FIG. 2 shows the boiler 2 of the electric device according to FIG. 1 in a perspective illustration, wherein the circulation system and the support frame have been omitted for the sake of greater clarity. The end cover 4 with the insulating fluid inlet 10 can be seen in the foreground, whilst the end cover 5 with the insulating fluid outlet 11 is illustrated in the background. It can be seen that the end covers 5 are equipped with hand holes 17 which facilitate the mounting and maintenance of the traction transformer 1.
[0042] Because the central part 3 is manufactured from a light material and two tubes 6 and 7 bearing tightly against the winding arrangements, less insulating fluid is required to completely fill the boiler. By virtue of the reduced volume of insulating fluid, the latter achieves critical temperature ranges more quickly during operation and constant cooling. For this reason, within the scope of the invention, the cooling of the windings has been improved.
[0043] FIG. 3 shows the boiler according to FIG. 2, wherein the means for the improved cooling are, however, indicated. Thus, an insulating fluid line 19 extends between each insulating fluid inlet 10 and a distribution unit 18. With the aid of the insulating fluid line 19, which has a tubular configuration, the cooled insulating fluid fed into the insulating fluid inlet 10 is routed directly to the distribution unit 18 such that it no longer mixes with the warm insulating fluid arranged in the inner end cover 4. The distribution unit 18 is here arranged on the end side of the winding arrangement which in each case faces the insulating fluid inlet 10. The distribution unit here has an annular design in plan view such that it covers the whole end side of the winding arrangement.
[0044] The distribution unit 18 has an intake unit 20 which is shown from the front in FIG. 4 and from the rear in FIG. 5. It can be seen that the front side has a plane design, wherein a through bore 21 can be seen which serves to receive the outlet opening of the connecting line 19. In this way, the inflowing cooled insulating fluid passes through the through bore 21 to the rear side of the intake unit 20 which is equipped with an inner 23 and outer 22 annular groove. Both grooves 22 and 23 open out in the intake opening 21 such that the inflowing insulating fluid is routed through the grooves 22 and 23.
[0045] The rear side, shown in FIG. 5, of the intake unit 20 bears against the front side of a perforated disk 24 which is shown from the rear in FIG. 6. The perforated disk 24 is equipped with through bores 25 which enable the passage of insulating fluid from the grooves 22, 23 of the intake unit 20 into distribution cavities 26 which are delimited in the axial direction once by the perforated disk 24 and by the end side of the winding arrangement (not shown). The distribution cavities 26 are delimited laterally by spacers 27 which are oriented radially or in a radiating fashion and form distribution cavities 26 which resemble pieces of cake. An outer delimiting ring (not illustrated representationally) and an inner delimiting ring (likewise not illustrated representationally) ensure that the escape of insulating fluid in a radial direction inward or outward from the distribution cavities 26 is avoided.
[0046] FIG. 7 shows the end side of a winding arrangement 31 in a plan view, wherein the end side shown faces away from the distribution unit 18. The winding arrangement 31 has an inner low-voltage winding 29 which is extended in the axial direction by an auxiliary winding, and an outer overvoltage winding 30 arranged concentrically with the undervoltage winding. It can be seen that the layers of the respective winding 29 or 30 are not wound directly on top of one another and instead are spaced apart from one another. This is effected by wrapping round so-called winding strips which are not illustrated in the Figure. The strips ensure the radial spacing of the winding layers which is required there such that cooling channels 28 are formed between the winding layers and the strips. By virtue of the cooling channels 28, the rear side, arranged at the other end side of the winding arrangement 31, of the perforated disk 24 including its spacers 27 and its through bore 25 can be seen. It can thus be understood that cooled insulating fluid entering the distribution cavities 26 flows through the cooling channels 28 of the windings and thus ensures improved cooling of the windings 29 and 30.
[0047] FIG. 8 shows that end of the winding arrangement 31 which faces the distribution unit 18, and the distribution unit 18 itself. The distribution unit 18 is here illustrated in a partially cutaway view. First, the intake unit 20 can be seen which has on its rear side an inner groove 23 and an outer groove 22 which, as has already been explained, are both connected to the intake opening which is not illustrated in FIG. 8. Furthermore, the perforated disk 24 can be seen which delimits the grooves 22 and 23. The perforated disk 24 is equipped with through openings, not illustrated representationally, which enable the passage of the insulating fluid from the grooves 22, 23 into the distribution cavities 26 which are delimited on one side by the perforated disk 24 and on the other side by the end side of the winding arrangement. In order to avoid the escape of insulating fluid from the distribution cavities 26, an outer sealing ring 32 and an inner sealing ring 33 can be seen which ensure that the cooled insulating fluid passes from the distribution cavities 26 into the cooling channels 28 of the windings.
