EP2104119A1

EP2104119A1 - Mounting device for transformer cores

Info

Publication number: EP2104119A1
Application number: EP08005409A
Authority: EP
Inventors: Ali Yasar
Original assignee: ABB Technology AG
Current assignee: ABB Technology AG
Priority date: 2008-03-22
Filing date: 2008-03-22
Publication date: 2009-09-23
Also published as: CN202145423U; WO2009118099A1

Abstract

The invention refers to a mounting device for manufacturing of transformer cores (90) composed of stacked metal sheets. A flat mounting area (12) is pivotable around a swiveling axis (99) and a platform (14) being adjacent to that flat mounting area (12) is in parallel to the swiveling axis (99) and upright to flat mounting area (12). At least two beams being adjustable in length (22, 24, 26, 28, 30, 32) are arranged parallel to each other on and in parallel to the flat mounting area (12) and crosswise to the swiveling axis (99). On that side of the beams which is opposite to the flat mounting area (12) at least two block-shaped leveling elements (50, 52) are provided, which are connected to the beam (22, 24, 26, 28, 30, 32) by magnetic force. Those sides of the at least two block-shaped leveling elements (50, 52) being opposite to the flat mounting area (12) are in line and in parallel to the flat mounting area (12) and the bock shaped leveling elements (50, 52) being attached to the at least two beams (22, 24, 26, 28, 30, 32) form a basis for the metal sheets to be stacked on them.

Description

The invention relates to a mounting device for the manufacturing of transformer cores composed of stacked metal sheets, having a flat mounting area.
It is known, that cores for electrical transformers are composed of stacked metal sheets to prevent eddy currents during operation of such a transformer. Transformer cores for high power three phase transformers, for example in the range of 10 MVA up to several 100 MVA, have a size of some meters in length and width. Several transformer limbs, preferably 2, 3 or 5, are provided, which normally are arranged in parallel to each other. Those limbs are connected at their ends with yokes.
Since the weight of such transformer cores is partially more than several 1000 kg, it is advantageous for stacking of such cores to have a certain mounting device, which is adjusted to the shape of the transformer core to be stacked. A high power transformer is no mass product and therefore the setup of such a mounting device has to be adjusted very often.
Disadvantageously within the state of the art is that the adjustment of the setup of the mounting device to the shape of transformer core to be stacked is very complex and takes several hours.
Therefore this invention aims at the reduction of the effort for changing the setup of a mounting device for transformer cores.
This problem is solved by a mounting device for transformer cores with the features described in claim 1.
Accordingly the mounting device for transformer cores mentioned above is characterized in that the flat mounting area is pivotable around a swiveling axis, that a platform is provided in parallel to the swiveling axis and upright to the flat mounting area, that on the flat mounting area in parallel to it and crosswise to the swiveling axis at least two beams being adjustable in length parallel to each other are arranged, that on that side of the beams which is opposite to the flat mounting area at least two block-shaped leveling elements are provided, which are connected to the beam by magnetic force, that those sides of the at least two block-shaped leveling elements being opposite to the flat mounting area are in line and in parallel to the flat mounting area and that the bock shaped leveling elements being attached to the at least two beams form a basis for the metal sheets to be stacked on them.
Hence it is possible to easily adapt the basic shape of the basis for stacking the metal sheets. Each limp of the transformer core to be mounted is related to its own beam, which is adjustable in length according to the length of the limb. A beam adjustable in length features at least a base module, which is preferably a hollow beam, and also at least one prolongation module, which is a beam with a smaller cross-section and which is guided moveable inside the hollow base module. By such a telescopic mechanism, the beam becomes adjustable in length.
Block shaped elements are connected to the upper side of the beams to provide a basis for stacking the metal sheets. This connection is preferably realized by magnetic force. In this case the leveling elements can easily become mounted on and removed from the beam. Since the prolongation module of the beam adjustable in length has a smaller cross-section than the base module, all leveling elements placed on the prolongation module have to be thicker than those which are placed on the base module to provide a plane basis. A distance between the leveling elements is required for example to enable surrounding the completely stacked transformer core with a tape for stabilizing, which is guided between neighbored leveling elements.
During stacking the metal sheets, the flat mounting area is in horizontal position. This enables an easy stacking. After stacking and unifying the transformer core, the whole mounting area is pivotable into a vertical position to ensure an easier handling and transportation of the transformer core. The transformer core has to be stacked with one side adjacent to the platform, so the weight load of the transformer core goes over on the platform while pivoting.
In a variant of the invention, the gap between the at least two beams being adjustable in length is also adjustable. This enables an easy adjustment of the stacking base to the shape of the transformer core to be stacked, in particular the distance of the transformer limbs.
In a certain embodiment of the invention at least two first skid-like beams are connected to the mounting device opposite to the flat mounting area and in parallel to it, being crosswise to the swiveling axis and comprising a support bend at this end which is opposite to the swiveling axis. Preferably a second skid-like beam is connected at the opposite end of each support bend which is in parallel to the platform.
Hence the mounting device can be as well in horizontal as in vertical position always supported by skid-like beams. Further it is possible to change between those positions in a rolling motion with the support bend.
In a further variant at least one support beam may be attached to at least one first skid-like beam for stabilizing the position of the mounting device in vertical orientation. Thus it becomes possible to stabilize the mounting device, when it is in vertical position.
In another version of the invention at least two block-shaped leveling elements may be fixed with at least one permanent magnet each. Those block-shaped leveling elements are preferably made for example of wood. A permanent magnet enables an easy fixing and removing of them and therefore it provides a high flexibility. The material wood enables an easier manual handling due to its little weight.
In a further embodiment of the invention, at least one actuator is provided for adjusting the length of the at least two beams and/or at least one actuator is provided for the adjustments of the distances between the beams. By using at least one actuator, for example an electrical motor, the adjustment of the mounting device to the requirements of the transformer core to be stacked becomes easier and the handling at all is simplified in an advantageous manner.
In further variant of the invention at least one mounting fixture is connected with the magnetic force of a permanent magnet on the flat mounting area. Those mounting fixtures are used to match the right position of the metal sheets during stacking. A fixing of those fixtures on the mounting area with a magnetic force will also simplify the handling. Preferably the locations, where to fix those fixtures to the mounting area, are marked for example with color.
The problem mentioned above is also solved by a method for manufacturing of transformer cores, whereas pre-manufactured metal sheets are stacked into the contour of a transformer core. This method is characterized in that the metal sheets are stacked on a horizontal basis, that the stacked metal sheets are unified to a transformer core, that the transformer core is fixed to the horizontal basis, that the former horizontal basis is pivoted together with the transformer core to a vertical orientation and that the fixed transformer core is released from the basis.
In this way, i.e. in a horizontal position stacking the metal sheets becomes feasible in a very comfortable and safe way. After unifying the stacked metal sheets to form a transformer core this transformer core will be pivoted into a vertical position, for example by means of a crane, in order to make the further handling of the transformer easier. Such a handling, for example its transportation, can be executed with a crane.
Further advantageous embodiments of the invention are mentioned in the dependent claims.
The invention will now be further explained by means of an exemplary embodiment and with reference to the accompanying drawings, in which:

Figure 1: shows a top view on a horizontally oriented mounting device,
Figure 2: shows a side elevation of a horizontally oriented mounting device and
Figure 3: shows a side elevation of a vertically oriented mounting device.

Fig. 1 shows a top view 2 on a horizontally oriented exemplary mounting device. A flat mounting area 12 with a length and a width of some meters each for example, is provided for pivoting around a swiveling axis 99. Upright to the flat mounting area 12 and in parallel to the swiveling axis 99 a platform 14 is attached, the height of which corresponds at least to the maximum thickness of a transformer core which my be for example 2 m. Four fixtures 110 are fixed to the surface of the flat mounting area by magnetic force, but also different number e.g. six or more is within the idea of the invention. Such fixtures are provided as a helping device for the positioning of the metal sheets on the stack.
Three beams being adjustable in length 22, 24, 26, 28, 30 (see Fig. 2), 32 are arranged in parallel on the flat mounting area, having a base module 22, 26, 30 (see Fig. 2) and a prolongation module 24, 28, 32 each. Also different number of beams, for example five, is possible. There may be more than one prolongation module provided for a base module each inserted into the other. For the second beam 26, 28, the prolongation direction is marked with the arrow 40, the other beams are comparable to this.
Furthermore several block- shaped leveling elements 50, 52 are attached to the upper side of the first beam 22, 24 by means of magnetic force, whereas the first leveling elements 50 are attached on the base module of the first beam 22 and the second leveling elements 52, the thickness of which is bigger than that of the first leveling elements 50, are attached on the prolongation module of the first beam 24, what is not exactly shown in this drawing. The second beam 26, 28 and the third beam 30, 32 (see Fig. 2) are equipped with leveling elements in the same way, which is not shown in this drawing. All beams 22, 24, 30, 32 except the middle one 26, 28 are movable in the direction, which is marked with the arrows 42 and 44.
On the third beam 30 (s. Fig. 2), 32, a transformer limb 90 is shown, whereas comparable transformer limbs on the other beams and also the transformer yokes are not shown in this drawing.
At the rear side of the platform 14, two second skid-like beams 20 are attached, on which the mounting device is supported, if it is in vertical position as shown in Fig. 3, but also more than two skid-like beams 20 are covered by the idea of this invention.
Fig. 2 shows a side view on the same horizontal oriented exemplary mounting device. On the flat mounting area 12 the third beam 30, 32 is now shown in total. This beam is located on three supports 34, 36, whereas the base module of the first beam 30 is located on two first supports 34 and the prolongation module of the first beam is located on a second support 36.
The number of supports may differ from this example. It is also shown, that the first leveling elements 50, which are fixed on the base module 30 of the first beam, are thinner than the second leveling elements 52, which are fixed to the prolongation part 32 of the third beam.
All leveling elements 50, 52 form a plane basis for stacking a transformer core, respectively a transformer limb 90, as shown in this figure. This transformer limb 90 is indicated to be composed of several metals sheets in Fig. 2. The transformer limb 90 is adjacent to the platform 14 on its left side. When the mounting device is turned into its vertical position, as shown in Fig. 3, the whole weight load of the transformer core respectively of the transformer limb is on the platform 14 then.
Opposite to the flat mounting area a first skid-like beam 16 is shown, on which the mounting device stands in its horizontal position, whereas of course at least two of them are provided in order to keep it in a stable position. Adjacent to the skid-like beam a support bend 18 is shown and adjacent to this a second skid-like beam 20 is shown, too.
When turning the mounting device into its upright position as shown in Fig. 3 a rolling motion over the support bend 18 has to be done, so that the mounting device stands on the second skid-like beams in its vertical or upright position.
Fig. 3 shows the same exemplary mounting device in its upright position. A support beam 38 is attached along at least one first skid-like beam to stabilize the upright position. Several fixing device to temporarily fix the transformer core on the flat mounting area are not shown.

List of reference signs

2: top view on a horizontal oriented exemplary mounting device
4: side view on a horizontal oriented exemplary mounting device
6: side view on vertical oriented exemplary mounting device
12: mounting area
14: platform
16: first skid-like beam
18: support bend
20: second skid-like beam
22: base module of the first beam
24: prolongation module of the first beam
26: base module of the second beam
28: prolongation module of the second beam
30: base module of the third beam
32: prolongation module of the third beam
34: first support
36: second support
38: support beam
40: prolongation direction
42: move direction of the first beam
44: move direction of the second beam
50: first leveling elements
52: second leveling elements
90: transformer core
99: swiveling axis
100: base
110: mounting fixture

Claims

A mounting device for manufacturing of transformer cores (90) composed of stacked metal sheets, having a flat mounting area (12),
characterized in that
the flat mounting area (12) is pivotable around a swiveling axis (99), that a platform (14) is provided in parallel to the swiveling axis (99) and upright to the flat mounting area (12), that at least two beams being adjustable in length (22, 24, 26, 28, 30, 32) parallel to each other are arranged on the flat mounting area (12) in parallel to it (12) and crosswise to the swiveling axis (99), that at least two block-shaped leveling elements (50, 52) are provided on that side of the beams which is opposite to the flat mounting area (12), being connected to the beam (22, 24, 26, 28, 30, 32) by magnetic force, that those sides of the at least two block-shaped leveling elements (50, 52) being opposite to the flat mounting area (12) are in line and in parallel to the flat mounting area (12) and that the block shaped leveling elements (50, 52) being attached to the at least two beams (22, 24, 26, 28, 30, 32) form a basis for the metal sheets to be stacked on them.
A mounting device according to claim 1, characterized in that the gap between the at least two beams adjustable in length (22, 24, 26, 28, 30, 32) is also adjustable.
A mounting device according to claim 1 or claim 2, characterized in that the flat mounting area (12) is pivotable around a swiveling axis (99) at least in-between horizontal and vertical orientation.
A mounting device according to any of the previous claims, characterized in that at least two first skid-like beams (16) are connected to the mounting device opposite to the flat mounting area (12) and in parallel to it (12), being crosswise to the swiveling axis (99) and comprising a support bend (18) at this end which is opposite to the swiveling axis (99).
A mounting device according to claim 4, characterized in that at the opposite end of each support bend (18) a second skid-like beam (20) is connected which is in parallel to the platform (14).
A mounting device according to claim 4 or 5, characterized in that along at least one first skid-like beam (16) at least one support beam (38) is attached for stabilizing the position of the mounting device in vertical orientation.
A mounting device according to any of the previous claims, characterized in that the at least two block-shaped leveling elements (50, 52) are fixed with at least one permanent magnet each.
A mounting device according to any of the previous claims characterized in that the at least two block-shaped leveling elements (50, 52) are made of wood.
A mounting device according to any of the previous claims characterized in that the flat mounting area (12) features at least partial magnetic characteristics.
A mounting device according to any of the previous claims characterized in that at least one actuator is foreseen for adjusting the length of the at least two beams and/or at least one actuator is foreseen for the adjustments of the distances between the beams (22, 24, 26, 28, 30, 32).
A mounting device according to any of the previous claims characterized in that at least one mounting fixture (110) is connected with the magnetic force of a permanent magnet on the flat mounting area (12).
Method for manufacturing of transformer cores, whereas pre-manufactured metal sheets are stacked into the contour of a transformer core (90), characterized in that the metal sheets are stacked on a horizontal basis, that the stacked metal sheets are unified to a transformer core (90), that the transformer core is fixed on the horizontal basis, that the former horizontal basis is pivoted together with the transformer core to a vertical orientation and that the fixed transformer core is released from the plane.
Usage of a mounting device according to claim 1 or 11 for the manufacturing of a transformer core.