ELECTRICAL APPLIANCE WITH MECHANICAL DECOUPLING BETWEEN THE ACTIVE PART AND BOILER

Abstract

An electrical appliance for connecting to a high voltage includes an active part, which is provided with a magnetizable core and at least one winding assembly, surrounding a respective core section of the core and having windings that are inductively coupled to one another. A tank, which can be filled with an insulating fluid, encases the active part. The tank has two end casings and a central part arranged between the end casings. The electrical appliance is compact and has a low tare weight. The active part is mechanically connected to the boiler only at the end casings and the end casings are supported on fasteners. The central part is produced from a light material.

Claims

1-13. (canceled)

14. An electrical appliance for connection to a high voltage, the electrical appliance comprising: an active part having a magnetizable core and a winding assembly enclosing a core portion of said core, said winding assembly having windings that are inductively coupled to one another; and a tank to be filled with an insulating fluid and completely enclosing said active part, said tank having two end casings and a central part disposed between said end casings; said active part being mechanically connected to said tank only at said end casings, and said end casings being supported on a fastener; and said central part being made from a lightweight material.

15. The electrical appliance according to claim 14, wherein said fastener comprises a support frame.

16. The electrical appliance according to claim 15, wherein said support frame has two longitudinal supports and two transverse supports extending between said longitudinal supports, and wherein each of said end casings is supported on a respective one of said transverse supports.

17. The electrical appliance according to claim 14, wherein said core has two mutually parallel core limbs that are each enclosed by a winding assembly, and said core limbs are connected to one another by a lower yoke and an upper yoke.

18. The electrical appliance according to claim 17, wherein said lower yoke and said upper yoke are in each case connected to said lower and upper end casings by way of spacers, and wherein said spacers are disposed in an interior of the respective said end casing.

19. The electrical appliance according to claim 18, wherein each spacer is connected to a fastening plate disposed outside the respective said end casing.

20. The electrical appliance according to claim 19, wherein each fastening plate is connected to said fastener.

21. The electrical appliance according to claim 14, wherein said end casings are formed of a metal or a metal alloy.

22. The electrical appliance according to claim 21, wherein said end casings are formed of steel.

23. The electrical appliance according to claim 14, wherein said end casings are box-shaped casings.

24. The electrical appliance according to claim 14, wherein said end casings have a shape that is complementary to a portion of said active part lying opposite thereof.

25. The electrical appliance according to claim 14, wherein at least one of said end casings is formed with at least one of a viewing window or a hand opening.

26. The electrical appliance according to claim 14, wherein said central part has two planar flange portions and two hollow members extending therebetween, wherein each flange portion is mechanically and releasably connected to a flange portion of one of said end casings, and wherein sealing means are disposed between said flange portions.

27. The electrical appliance according to claim 26, wherein at least one end casing for a transverse support of said fastener, on which said end casing bears, forms a counter bearing for delimiting a movement of said tank in an axial direction.

Description

[0029] Further expedient design embodiments and advantages of the invention are the subject matter of the description hereunder of exemplary embodiments of the invention with reference to the figures of the drawing, wherein identical reference signs relate to equivalent components, and in which:

[0030] FIG. 1 shows an exemplary embodiment of the electrical appliance according to the invention;

[0031] FIG. 2 shows the electrical appliance according to FIG. 1 without a tank;

[0032] FIG. 3 shows an internal view of the rear end casing of the electrical appliance according to FIG. 1;

[0033] FIG. 4 shows an internal view of the front end casing of the electrical appliance according to FIGS. 1; and

[0034] FIG. 5 shows the electrical appliance according to FIG. 1 from below, in each case highlighting this in a perspective view.

[0035] FIG. 1 shows an exemplary embodiment of the electrical appliance 1 in a perspective view, wherein the electrical appliance is embodied as a railway transformer 1. The railway transformer 1 comprises a tank 2 which could also be referred to as a housing, which comprises a central part 3, a rear end casing 4 and a front end casing 5. The central part 3 has two tubular portions 6 and 7 which delimit a circular-cylindrical internal cavity. The tubular portions 6 and 7 here extend in the axial direction or longitudinal direction. One flange portion 8 and 9 is in each case molded to both end sides of the tubular portions 6 and 7. Each flange portion 8 and 9, respectively, here is of a planar configuration and, by way of the respective external face thereof that faces the end casings, lies in a plane that extends in the radial direction.

[0036] For connecting to the central part, each end casing 4, 5 likewise has a flange portion 10 and 11 which is designed so as to correspond to the flange portions 8 and 9, respectively. In this way, the flange portions 8 and 10, or 9 and 11, respectively, are exactly opposite one another, wherein through bores by way of which the flange portions 9 and 11, or 8 and 10, respectively, can be screwed to one another are configured in the flange portions 10 and 11. The end casings 4 and 5 are designed so as to be box-shaped and have an end wall 12 which faces away from the respective flange portion, wherein lateral walls 13 extend between the end wall 12 and the flange portion 10 or 11, respectively. The rear end casing 4 is beveled at the corners so as to have an ideally small internal volume. The front end casing has an end wall 12 with beveled faces. This also serves for adapting the end casing to the design embodiment of the active part in this region and to thus minimize the internal volume of the tank 2, or of the respective end casing 5, respectively.

[0037] Each end casing 4 and 5 has hand holes 14 which are illustrated so as to be open in FIG. 1 and can be closed by a closure plate not illustrated. Sealing means ensure the necessary fluid-tight connection between the closure plate and the lateral wall 13 in which the hand hole 14 is configured.

[0038] The railway transformer, which is disposed in a horizontal orientation, furthermore comprises fastening means 33 which in FIG. 1 are embodied as support frames 33. The support frame 33, which in terms of the construction thereof is simple, comprises two longitudinal supports 34 which run so as to be mutually parallel, two transverse supports 35 which are likewise disposed so as to be mutually parallel extending between said longitudinal supports 34.

[0039] The tank 2 by way of the end casings 4 and 5 thereof rests on the transverse supports 35, wherein each end casing 4, 5 bears on the transverse support on a flat lower side. Each transverse support 35 is embodied as a hollow-section support and has two flat wide sides that point upward and downward, and two narrow sides that point toward the front and the rear. The flat lower side bears on the flat upper wide side of the transverse support 35 such that the respective end casing 4, 5 and the respective transverse support 35 bear on one another in a planar manner. An incline extends from the lower side of the end casing toward the flange portion 10 or 11, respectively. This incline lies opposite the narrow side of the respective transverse support 35 and thus forms a counter bearing. An axial movement of the tank 2 on the support frame is thus limited.

[0040] It can be seen that, apart from the transverse supports, the longitudinal supports 34 are also composed of hollow sections. Furthermore, fastening bolts 36 which serve for fastening the support frame to a rail vehicle not illustrated protrude from the longitudinal supports 34 in the orthogonal direction.

[0041] FIG. 2 shows the railway transformer 1 according to FIG. 1 without the tank 2 so as to obtain a view onto the active part 18 that is disposed in the tank. The active part 18 disposed in the tank 2 comprises two winding assemblies 19 and 20 which have in each case windings that are disposed so as to be mutually concentric. In this way, each winding assembly 19 and 20 comprises an outer primary winding and inner secondary winding which is disposed so as to be concentric with the primary winding. Furthermore provided in the interior of the primary winding is a concentrically disposed auxiliary operative winding. A core limb 24 of a core 25 extends through each winding assembly, wherein the two parallel core limbs 24 are connected to one another by a lower yoke 26 and an upper yoke 27 such that a circumferentially closed ferromagnetic circuit is formed. The core 25 is composed of laminations which bear on one another in a planar manner and are mutually compressed by a clamping frame on the lower yoke 26 and the upper yoke 27, respectively. The bracing or compressing of laminations bearing on one another in a planar manner is however known to the person skilled in the art such that no explanations in more detail are required at this point.

[0042] The construction composed of the press frame and the yoke bears on spacers 40 which in turn are fastened to the transverse supports 35 of the support frame 33. The spacers 40 here are disposed within the end casings 4 or 5, respectively, as will be explained in more detail hereunder.

[0043] With this construction, the weight of the active part 18 is introduced into the support frame 33 exclusively by way of the core 25 and the spacers 40. The introduction of forces into the central part of the tank 2 is avoided.

[0044] FIG. 3 shows the end casing 4 from the inside, in a perspective illustration. It can be seen that the end casing has through bores 45 for introducing feedthroughs and other connectors. The hand openings 14 can moreover be seen again. The end casing 4 furthermore forms a flat lower side 42 in which said end casing 4 bears in a planar manner on the upper wide side of the transverse support 35. An oblique side 43 in the form of a wall running obliquely in relation to the lower side 43 runs so as to proceed from the lower side 42. The oblique side forms a counter bearing in relation to the transverse support 35 and in this way prevents any undesirable axial movement of the tank 2 on the support frame 33.

[0045] The spacers 40 are disposed in the interior of the end casing 4. It can furthermore be seen that the flange portion 10 of the end casing 4 has through bores.

[0046] FIG. 4 in a perspective illustration shows the end casing 5; it can be seen in particular here that the spacers 40, which are disposed within the end casing 5, are fixedly connected to the reinforcement part 17, wherein the reinforcement part 17 in turn is fixedly connected to the transverse support 35. In this way, the spacers 40 can now be connected to the clamping frame or to the upper or lower yoke of the active part, respectively, by way of an expedient connection, for example a screw connection or any other mechanical connection, such that a fixed connection is established between the transverse support and the active part of the railway transformer. Therefore, the forces of the dead weight of the active part are introduced into the transverse support 35 of the support frame 33 by way of the core 25, optionally by way of the clamping frame into the spacers 40 and the fastening parts 14.

[0047] FIG. 5 shows the railway transformer 1 in a perspective illustration from below. It can be seen that the transverse supports 35 of the support frame have a mutual spacing, the latter making it possible for the tank 2 to be placed onto the support frame 33 such that the flange portions 8 and 10, or 9 and 11, respectively, are disposed between the transverse supports 35. The oblique portion 43 here bears on the narrow side of the respective transverse support 35 such that the latter forms a counter bearing so as to prevent an axial movement of the tank 2. It can moreover be seen that the transverse support 35 has a set of four through bores 44 in order for the reinforcement part 17 to be fixedly connected to the transverse support 35. The connection is performed, for example, by an expedient screw connection such that a locationally fixed mechanical connection between the tank 2 and the support frame 33 of the railway transformer 1 is established.