Method and device for assembling a transformer with direct cooling

Abstract

The invention relates to a method and a device for assembling a transformer with direct cooling of the active part. First of all, a connecting tube (7) is connected to a compensating flange (8) in a form-fitting manner. A flange (4) is then arranged around an opening (5) in the wall (6) of the boiler (2) and connected in a form-fitting manner such that the opening (5) in the wall (6) and the opening in the flange (16) lie centrally one above the other. The connecting tube (7) is then guided through the opening (16) in the flange (4) and the opening (5) in the wall (6) of the boiler (2) and introduced into the active part (2), wherein the compensating flange (8) is movable on the flange (4). Guide through. Finally, a clamping ring (9) is connected to the flange (4), as a result of which the compensating flange (8) is fixed.

Description

[0001] Description

[0002] Method and apparatus for assembling a transformer with direct cooling

[0003] The present invention relates to a method and apparatus for assembling a transformer with direct cooling of an active part in a tank of the transformer. In particular, the invention relates to a multi-part connection system for assembling a transformer, which compensates for tolerance differences between the active part and the tank during assembly and ensures a reliable, clean and leak-proof connection.

[0004] Transformers are essential components in energy transmission and distribution, and their efficiency and reliability are of paramount importance. The active part of a transformer refers to the essential components responsible for converting electrical energy. These typically include the core, windings, and insulation. The active part is the heart of the transformer, where the electromagnetic processes that transform voltage and current take place. The tank, in a transformer, is the casing or container that encloses the active part and the insulating fluid. The tank protects the internal components from external influences and ensures the mechanical stability of the transformer. It also serves as a reservoir for the cooling and insulating fluid, which is used for heat dissipation and electrical insulation of the active part.

[0005] When assembling a transformer, the challenge lies in routing and connecting a cooling channel through the tank to the active part of the transformer. Previous methods employed two main approaches to achieve this assembly. The first involved welding dedicated cooling channels to both longitudinal sides of the tank, upon which the active part was placed. The second involved attaching flanges to the longitudinal side of the tank and bolting a cooling channel to the active part.

[0006] The existing solutions present several problems. For example, the connection between the boiler and the active part is extremely challenging due to tolerance differences and is associated with considerable costs. The active part is usually attached to the cover of the distribution transformer, making inspection after installation virtually impossible. Maintaining cleanliness in the internal channels often proves difficult, frequently requiring additional flanges that, in turn, must be carefully sealed, thus posing a potential leakage risk. It cannot be verified after installation whether the active part is correctly positioned, creating uncertainty regarding the system's leak tightness. Some transformers require a manhole flange for sealing, which again necessitates meticulous sealing work and potential leakage risks.Furthermore, for transformers with manhole flanges, the standardized general tolerances are not sufficient to compensate, leading to the selection of tighter tolerances and increased costs.

[0007] The object of the invention is to create a method and a device for assembling a transformer which compensates for the tolerance differences between the boiler and the active part, enables simple control and monitoring, ensures cleanliness and tightness, and reduces costs.

[0008] The problem is solved by a method according to claim 1 and a device according to claim 5. The dependent claims describe further advantageous embodiments of the invention.

[0009] The problem of the invention, which relates to a method, is solved by a method for assembling a transformer with direct cooling of an active part in a tank in transformers, comprising the following steps:

[0010] - Form-fitting connection of a connecting pipe to a compensating flange;

[0011] - Arranging and positively locking a flange

[0012] (4) around an opening (5) in the wall (6) of the boiler (2) , such that the opening (5) of the wall (6) and the opening of the flange (16) are centered on top of each other;

[0013] - Passing the connecting pipe (7) through the opening (16) of the flange (4) and the opening (5) in the wall (6) of the boiler (2) and inserting it into the active part (2) , wherein the compensating flange (8) is movable on the flange (4);

[0014] - Connecting a clamping ring (9) to the flange (4) , thereby fixing the compensating flange (8) .

[0015] The invention offers a solution to the previously described problem by means of a multi-part connection system capable of compensating for tolerance differences between the boiler and the active part in the lateral direction. The connection system consists of an enlarged flange on the boiler, a connecting pipe, a clamping ring, and a receptacle on the active part.

[0016] The invention enables the straightforward compensation of tolerance differences. This means that even with minor deviations in the dimensions of the components, a reliable connection can be established. Unlike conventional solutions, there are no enclosed or inaccessible areas. This ensures cleanliness throughout the entire assembly and manufacturing process of the subcomponents, as all components are visible and accessible at all times. During the assembly process, it can be verified at any time that all components are properly connected. There is no risk of leaks or blockages in the cooling system, as the connection and tightness can be monitored continuously.The advantages of these differences are improved efficiency, lower costs due to the elimination of costly cleaning and inspection processes, and increased safety and reliability of the overall system.

[0017] Possible fields of application of the invention are transformers in energy transmission and distribution, in particular distributed transformers.

[0018] In a particular further development of the method according to the invention, the connecting pipe is inserted into an adapter system on the active part side. The adapter system comprises a sleeve into which the connecting pipe is inserted, and which includes a sealing ring that seals the connecting pipe against the adapter system. The adapter system thus serves as the receptacle for the connecting pipe on the active part. This allows the connecting pipe to move relative to the adapter system during assembly, enabling simultaneous adjustment of all tolerance differences between the boiler and the active part of the transformer. This further development allows for the compensation of not only lateral (displacement) tolerance differences but also axial (enlargement or reduction) and angular (pivot) tolerance differences. This is achieved by the connecting pipe in the lateral direction and by the adapter system in the axial and angular directions.

[0019] Preferably, the connecting pipe has a diameter (A) that is smaller than the diameter (B) of the flange and smaller than the diameter (C) of the opening. This compensates for lateral tolerance differences in particular. Preferably, the connecting system is used for conveying insulating fluid, so that the active part of the transformer is directly cooled by means of insulating fluid via cooling lines connected to the connecting system.

[0020] The method according to the invention ensures proper assembly and thus avoids the disadvantages of the prior art.

[0021] The object of the invention, which relates to a device, is solved by a connection system for the direct cooling of an active part in a boiler in transformers, comprising a flange which is arranged around an opening in the wall of the boiler and is positively connected to the boiler, a connecting pipe which is guided through an opening of the flange and the opening in the wall of the boiler, according to the invention the connecting pipe is positively connected to a compensating flange, wherein the compensating flange is movably arranged on the flange, and a clamping ring which is connected to the flange, and fixes the movable compensating flange.

[0022] The advantages of the method according to the invention apply equally to the device according to the invention.

[0023] In a particular development, the connecting pipe on the active part side is inserted into an adapter system. The connecting pipe is designed to guide an insulating fluid into the active part of the transformer. The adapter system comprises a sleeve into which the connecting pipe is inserted, and which includes a sealing ring that seals the connecting pipe against the adapter system. In this way, the connecting pipe is movable relative to the adapter system during assembly, allowing for the simultaneous adjustment of tolerance differences between the boiler and the active part of the transformer. Preferably, the connecting pipe has a diameter (A) that is smaller than the diameter (B) of the flange and smaller than the diameter (C) of the opening.

[0024] Preferably, the connection system is designed for the passage of insulating fluid, so that the active part of the transformer can be cooled directly by means of insulating fluid via cooling lines connected to the connection system.

[0025] The invention and advantageous further developments are described in more detail below with reference to figures. These show

[0026] Figure 1 A schematic representation of a transformer with tank and active part and the connection system according to the invention

[0027] Figure 2 A sectional view of the connection system according to the invention

[0028] Figure 3 A sectional view of the connection system according to the invention, by which a lateral tolerance shift is compensated.

[0029] Figure 4 A sectional view of a special

[0030] Further development of the connection system with an adapter system

[0031] Figure 5 A sectional view of the special

[0032] Further development of the connection system with an adapter system, which compensates for an axial tolerance shift.

[0033] Figure 6 A sectional view of the special

[0034] Further development of the connection system with an adapter system that compensates for an angular tolerance shift.

[0035] Figure 7 A pictorial representation of the special further development of the connection system with an adapter system

[0036] Figure 1 shows a schematic cross-sectional view of a transformer. The transformer 17 consists of a tank 2 and an active part 3 arranged in the tank. The active part rests on feet 18 on the bottom of the tank 2. Also shown is the connection system 1 according to the invention, which is described in more detail in Figure 2. A cooling line is connected to the connection system.

[0037] Figure 2 shows a sectional view of the connection system 1 according to the invention. Shown is the wall of the boiler 2 and the wall of the active part 3 of a transformer 17.

[0038] The connection system 1 comprises a flange 4, which is arranged around an opening 5 in the wall 6 of the boiler 2 and connected to the boiler 2. Figure 2 further shows a connecting pipe 7, which passes through an opening 16 of the flange.

[0039] 4 and the opening 5 in the wall 6 of the boiler 2. The connecting pipe 7 is positively connected to a compensating flange 8, the compensating flange 8 being movably arranged on the flange 4. The movable compensating flange 8 is fixed by a clamping ring 9, which is connected to the flange 4. The fixing can be done by screws.

[0040] The connecting pipe 7 can be made of a flexible material to allow for additional tolerance compensation. Preferably, the clamping ring 9 has a seal, such as a sealing ring, which ensures a reliable seal.

[0041] When assembling a transformer, the connecting pipe 7 is first positively connected to the compensating flange 8. This connection can be made by welding. Then, the flange 4 is positioned around the opening 5 in the wall 6 of the boiler 2 and positively connected, so that the opening

[0042] The openings of the flange 16 and the wall 6 are positioned centrally on top of each other. The connecting pipe 7 is then passed through the opening 16 of the flange 4 and the opening 5 in the wall 6 of the boiler 2 and inserted into the active part 2, with the compensating flange 8 being movable on the flange 4. The connecting pipe 7 can be adjusted here. Finally, a clamping ring 9 is connected to the flange 4, thereby fixing the compensating flange 8.

[0043] Finally, the proper placement and tightness of the connection can be verified by visual inspection and, if necessary, by pressure testing. Throughout the entire assembly process, it must be ensured that the internal channels are clean.

[0044] This ensures that the connection system 1 allows the passage of insulating fluid 11, so that the active part 3 of the transformer 1 can be cooled directly by means of insulating fluid 11 via cooling lines 12 connected to the connection system 1.

[0045] Figure 3 shows a detailed view of the connection system 1 according to the invention. It illustrates how the invention compensates for a lateral tolerance shift between the boiler 2 and the active part 3. Figure 3 essentially corresponds to the representation in Figure 2. However, a lateral tolerance shift between the active part 3 and the boiler 2 is visible here, indicated by the arrow. This shift is compensated for by the invention in that the compensating flange 8 is movable on the flange 4. During assembly, the clamping ring 9 is connected to the flange 4, thereby fixing the compensating flange 8.

[0046] In order for the compensating flange 8 to be movable on the flange 4, the connecting pipe 7 has a diameter A that is smaller than the diameter B of the flange 4 and smaller than the diameter C of the opening 5.

[0047] Figure 4 shows a sectional view of a particular further development of the connection system with an adapter system 13. The connecting pipe 7 is inserted into an adapter system 13 on the side of the active part 3, the adapter system 13 comprising a sleeve 14 into which the connecting pipe 7 is inserted, and which includes a sealing ring 15 by which the connecting pipe 7 is sealed against the adapter system 13.

[0048] Figure 5 shows a sectional view of the further development of the connection system with an adapter system 13. Figure 5 essentially corresponds to the representation in Figure 4. However, an axial tolerance shift between the active part 3 and the boiler 2 can be seen here, indicated by the arrow. This shift is compensated by the adapter system 13, in that the sleeve 14 with the sealing ring 15 is movable relative to the connecting pipe.

[0049] Figure 6 shows a sectional view of the further developed connection system with an adapter system 13. Figure 6 essentially corresponds to the representation in Figure 4. However, an angular tolerance shift between the active part 3 and the boiler 2 is visible here, indicated by the arrow. This shift is also compensated by the adapter system 13, in that the sleeve 14 with the sealing ring 15 is movable relative to the connecting pipe.

[0050] Figure 7 shows a pictorial representation of the special further development of the connection system 1 with an adapter system 13. The cooling line 12 connected to the connection system 1, the clamping ring 9, the compensating flange 8, the flange 4, the connecting pipe 7 and the sleeve 14 are shown.

[0051] The invention does not compensate for movements during the operation of the transformer, but rather for tolerance differences during assembly. The invention offers significant advantages in terms of efficiency, cost reduction, and the overall system safety.

Claims

Patent claims 1. Method for assembling a transformer (17) with direct cooling of an active part (3) in a boiler (2) in transformers (17) comprising the following steps: - Form-fitting connection of a connecting pipe (7) with a compensating flange (8) ; - Arranging and positively joining a flange (4) around an opening (5) in the wall (6) of the boiler (2) , such that the opening (5) of the wall (6) and the opening of the flange (16) are centered on top of each other; - Passing the connecting pipe (7) through the opening (16) of the flange (4) and the opening (5) in the wall (6) of the boiler (2) and inserting it into the active part (2) , wherein the compensating flange (8) is movable on the flange (4); - Connecting a clamping ring (9) to the flange (4) , thereby fixing the compensating flange (8) .

2. The method of claim 1, wherein the connecting tube (7) on the side of the active part (3) is connected to a adapter system (13) is inserted, wherein the adapter system (13) comprises a sleeve (14) into which the connecting tube (7) is inserted, and which comprises a sealing ring (15) by which the connecting tube (7) is sealed against the adapter system (13).

3. Method according to one of claims 1 or 2, wherein the connecting pipe (7) has a diameter (A) that is smaller than the diameter (B) of the flange (4) and smaller than the diameter (C) of the opening (5).

4. Method according to any one of claims 1 to 3, wherein the Connection system (1) for the passage of insulating fluid (11) is used, so that the Active part (3) of the transformer (17) via the The connecting system (1) and the connected cooling lines (12) are cooled directly by means of insulating fluid (11).

5. Connection system (1) for the direct cooling of an active part (3) in a boiler (2) in transformers ( 17 ) , encompassing - a flange (4) which is arranged around an opening (5) in the wall (6) of the boiler (2) and is positively connected to the boiler (2), - a connecting pipe (7) which is guided through an opening (16) of the flange (4) and the opening (5) in the wall (6) of the boiler (2), characterized in that - the connecting pipe (7) is positively connected to a compensating flange (8), wherein the The compensating flange (8) is movably arranged on the flange (4), - a clamping ring (9) which is connected to the flange (4) and fixes the movable compensating flange (8).

6. Connection system (1) according to claim 1, characterized in that the connecting tube (7) is inserted into an adapter system (13) on the side of the active part (3), wherein the adapter system (13) comprises a sleeve (14) into which the connecting tube (7) is inserted, and which comprises a sealing ring (15) by which the connecting tube (7) is sealed against the adapter system (13).

7. Connection system (1) according to claim 1, characterized in that the connecting pipe (7) has a diameter (A) that is smaller than the diameter (B) of the flange (4) and smaller than the diameter (C) of the opening (5) .

8. Connection system (1) according to claim 1, characterized in that the connection system (1) is designed for the passage of insulating fluid (11), such that the active part (3) of the transformer (17) is connected to the connection system (1) Cooling lines (12) can be cooled directly by means of insulating fluid (11).

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