Transformer tray, transformer stand and transformer arrangement

Abstract

The invention relates to a transformer tray for a large transformer, which is realized by a modular steel load frame that supports at least three stainless steel collection containers for distributing the weight of the large transformer. This load frame is also connected to two guide rails arranged on the load frame in such a way that the weight of the large transformer mounted on the guide rails is transferred through the load frame to a foundation located below the load frame. The load frame consists of at least three load frame modules that are reversibly connectable. The invention also relates to a transformer stand with a foundation and a transformer assembly that also includes a large transformer.

Description

[0001] The invention relates to a transformer housing for a large transformer with a mass of 30 to 100 tons, which advantageously has a lower weight and is easy to transport. The invention further relates to a transformer stand and a transformer arrangement.

[0002] Large transformers are essential components for voltage transformation and power distribution, required for numerous important applications that utilize voltage matching. A large transformer converts high voltages suitable for long-distance transmission into lower voltages that are safer for use in homes and businesses.

[0003] Large transformers are also crucial for redistributing electrical energy from power plants to local distribution networks, helping to maintain the stability and reliability of the power grid by compensating for voltage fluctuations. With the increasing use of wind and solar energy, they enable the integration of these decentralized generation sources into the grid and allow for the control and adjustment of energy supply according to demand. Overall, large transformers are a key component of modern energy infrastructure.

[0004] Since large transformers use a cooling and insulating oil, an effective containment solution for any potentially leaking oil is crucial to minimize environmental risks and fire hazards. Therefore, transformer assemblies must always incorporate an oil containment tray made of an impermeable material.

[0005] One difficulty in constructing such an oil containment basin or transformer basin is the high mass of such a large transformer, which ranges from 30 to 100 tons.

[0006] Various transformer substations for large transformers are known from the prior art. DE 102 47 826 A1 discloses a transformer substation for at least one transformer in which the oil containment basin is made of concrete. In particular, the transformer platform is monolithically constructed of concrete. Such a transformer substation is also known from DE 202 15 783 U1.

[0007] According to current technology, such oil containment basins are made of concrete. These can be cast on-site or prefabricated in a factory. A disadvantage of such oil containment basins made of concrete or reinforced concrete is their considerable weight. They typically weigh between 30 and 40 tons. Therefore, installing such systems requires lifting these heavy loads, for example, using cranes.

[0008] Transporting such large concrete containment basins often requires special transport. This is disadvantageous, as it necessitates complex permitting processes, with requirements often varying between federal states, and escort vehicles are usually required. The logistical effort is therefore considerable.

[0009] Furthermore, concrete production requires numerous resources and is therefore expensive to obtain. Since concrete plants are often operating at full capacity, this also leads to long waiting times.

[0010] The invention is therefore based on the objective of providing a device that overcomes the disadvantages of the prior art, in particular providing a means of setting up a large transformer that is quick and easy to manufacture and offers advantages in terms of construction. In particular, a fast and simple assembly should be achievable, while ensuring compliance with the design requirements for high weight and large containment volumes.

[0011] The problem is solved by a device with the features of the independent claims. Further developments are specified in the dependent claims.

[0012] A first aspect of the invention relates to a transformer housing for a large transformer with a mass of 30 to 100 t, preferably up to 100 t, which has the following features: • A steel load frame for transferring the weight of the large transformer, wherein the load frame comprises at least three load frame modules that can be reversibly connected to one another. Each load frame module has connecting elements that allow for easy assembly and disassembly. Thus, the load frame can be quickly assembled and disassembled. • Two parallel and spaced-apart steel guide rails for mounting a large transformer, arranged on and / or above the load frame and connected to the load frame in a force-transmitting manner. This allows the weight of the large transformer to be advantageously transferred from the guide rails downwards via the load frame. The force is preferably transferred to a foundation located below the load frame, preferably a base plate. • Three stainless steel collection containers arranged in the load frame, wherein the total volume of the collection containers, i.e. the sum of the volumes of the individual collection containers, is at least 30 m³ 3 , preferably at least 40 m 3 , is, and • A collection container cover that completely covers the collection container, wherein the collection container cover has openings for receiving liquid.

[0013] The collection containers arranged in the load frame are suitable for collecting both rainwater and oil that has leaked from a large transformer. Advantages

[0014] The individual load frame modules can be rigidly connected to each other to transmit forces. A key characteristic is that the individual load frame modules can be detached from one another. Thus, the load frame can be disassembled into its individual load frame modules.

[0015] An advantageous embodiment provides that a central module is designed and arranged such that it dissipates a large portion, i.e., at least 60% by weight, preferably at least 80% by weight, of the weight of a large transformer mounted on the guide rails, thus transferring it to a foundation. The weight is preferably transferred from the guide rails to the foundation via force-dissipation elements.

[0016] Such a design advantageously allows for cost-effective transport and assembly of the transformer tray. Furthermore, such a transformer tray can be easily dismantled at any time and can also be used as temporary storage for large transformers.

[0017] Since the load frame and the collection containers are made of steel or stainless steel, no concrete is required for these elements. This reduces carbon dioxide emissions.

[0018] Compared to conventional concrete containment basins, this solution offers short-term availability, as it is not dependent on the production times of concrete manufacturers. Assembly and transport do not require additional permits, such as heavy transport permits. Installation can be easily carried out with a smaller, standard crane, whereas concrete basins, due to their considerable weight, often require large cranes and corresponding storage areas. Furthermore, the modular design eliminates the need for heavy transport, special permits, and escort vehicles, significantly simplifying logistics. In addition, the elimination of concrete and the associated cement production results in significant CO2 savings, making the solution more sustainable.

[0019] This type of construction is particularly suitable for large transformers weighing between 30 and 100 tons.

[0020] Constructing the transformer housing from steel or stainless steel offers the advantages of durability and high stability.

[0021] Furthermore, the transformer tray according to the invention advantageously weighs only about 10 t, which significantly simplifies the transport of such a transformer tray.

[0022] A collection container is considered to be located within the load frame if it is situated at least partially, and in particular to at least 80% by volume, within the dimensions defined by the outer elements of the load frame. It is not excluded that such a collection container may partially extend beyond these defined outer dimensions.

[0023] A collection container cover completely covers the collection containers as described in the disclosure even if the cover has small openings that allow liquid to enter. These openings are preferably designed to allow liquid to enter while still maintaining the protective effect of the cover against flames. The openings are preferably round with a diameter of 8 mm. In one possible embodiment, elongated perforated sheets with 8 mm openings can be used. This advantageously allows oil to enter the collection containers, and it has been shown that burning oil is smothered by the small openings within the container.

[0024] With a favorable design, the collection container cover resting on the collection containers can withstand a surface load of 2kN / m². 2endure. This allows for advantageous entry.

[0025] In an advantageous embodiment, the load frame comprises an upper frame, a lower frame spaced apart from it, and force-dissipating elements connecting the upper and lower frames. The upper frame is positioned above the lower frame, and the weight of a large transformer can be transferred from the upper frame to the lower frame via the force-dissipating elements and thus dissipated downwards.

[0026] These force-transfer elements can transmit the weight of the large transformer from the guide rails to the foundation, preferably to the base plate. The force can either be transferred directly from the force-transfer elements to the foundation, preferably to the base plate, or the force can first be transferred from the force-transfer elements to the subframe, which then transfers this force to the foundation, in particular the base plate.

[0027] The load frame may contain steel profiles. In particular, the upper and lower frames may contain steel profiles. The force distribution elements may also contain steel profiles.

[0028] A steel profile, as defined in the invention, is a shaped piece made of steel. It can also be made of stainless steel, which is particularly common in the construction industry. Such a steel profile has an elongated shape, with its first dimension being at least twice as long as its other two dimensions. The cross-section is constant along the long first dimension. Various cross-sectional shapes exist, and the profiles are named accordingly. Examples include I-profiles, H-profiles, L-profiles, and U-profiles.

[0029] For the purposes of this invention, stainless steel is understood to be an iron-carbon alloy in which the mass fraction of carbon is a maximum of 2%. Furthermore, stainless steel, as defined in this invention, contains at least 8 wt.% chromium.

[0030] Depending on the possible design of the transformer tray, the steel profiles and / or the force transmission elements and / or the guide rails are made of stainless steel.

[0031] In an optional embodiment, at least three force-dissipation elements are arranged below the guide rails. This allows the weight force to be advantageously distributed across several force-dissipation elements. Preferably, the three force-dissipation elements are spaced apart from each other.

[0032] A preferred embodiment provides that the force-dissipating elements comprise steel profiles. These steel profiles can have a mass per unit length ranging from 30 kg to 70 kg per linear meter.

[0033] The load frame can have fixing elements for holding the collection containers. This allows the position of the collection containers in relation to the load frame to be advantageously fixed.

[0034] A preferred embodiment provides that at least one drip tray is arranged on at least two of the collection containers. Several drip trays can also be arranged on a single collection container. Such a drip tray can advantageously ensure that a liquid flowing in from above, which may have escaped from the large transformer in the event of a leak, is reliably directed into the collection containers, even in the areas adjacent to them, for example, between the containers. Preferably, such a drip tray is positioned close to the collection container.

[0035] In one possible embodiment, the walls of the collection containers have a thickness of 3 mm. In another possible embodiment, the walls have a thickness of 2.5 mm to 5 mm, preferably 3 mm to 4 mm. This makes the collection containers advantageously lighter and also requires less material.

[0036] Preferably, the transformer tray has pipe elements through which the collection containers are connected for liquid equalization. The pipe elements have a diameter of at least 50 mm, preferably at least 80 mm, so that a liquid-equalizing connection is created. This enables the distribution of a quantity of liquid to all collection containers connected by the pipe elements, even if liquid enters only one of the collection containers.

[0037] In a particularly advantageous embodiment, the pipe elements are arranged between the collection containers. Since externally located pipe elements are more easily damaged, pipe elements arranged between the collection containers have the advantage of preventing damage to pipe elements due to soil settlement or heavy construction machinery.

[0038] According to one embodiment, the collection containers are reversibly connected to the load frame. For example, the collection containers can be placed inside the load frame and can advantageously be detached from it again via the reversible connection. This facilitates easy transport and, in particular, also allows for transport of the collection containers separately from the load frame.

[0039] One possible design uses S49 guide rails. These guide rails are advantageously widespread and functional.

[0040] Optionally, the openings of the collection container cover are arranged in the edge area of ​​the collection container cover.

[0041] According to the invention, the openings of the collection container cover are arranged in the edge region of the cover if the distance between the openings and the edge of the cover is less than 100 cm. This distance is defined as the shortest distance between an opening and a section of the edge of the cover. Preferably, perforated metal sheets at least 60 cm wide are arranged in the edge region of the cover. Removing these sheets advantageously allows access to the collection containers.

[0042] The openings in the edge area are preferably designed as a grating.

[0043] According to a preferred embodiment, the collection container cover is made of a metal, preferably stainless steel.

[0044] According to the invention, a collection container cover is made of metal if the collection container cover comprises at least 80% by weight of metal or at least 80% by weight of a metal alloy. Advantageously, the collection container cover thus has a flame-retardant effect.

[0045] Another aspect of the invention relates to a transformer stand comprising a large transformer • A foundation, preferably a base slab, which is preferably made of concrete, • a transformer tray according to the invention arranged on the foundation, preferably on the base plate.

[0046] In an advantageous embodiment, the transformer housing has grounding cables. These grounding cables are preferably arranged around the outside of the transformer housing. The grounding cables are preferably integrated into the overall design of the system.

[0047] Furthermore, another aspect of the invention relates to a transformer arrangement comprising a transformer assembly disclosed herein and a large transformer. The large transformer has a mass of at least 30 t, preferably a mass in the range of 30 t to 100 t, and is arranged on the guide rails.

[0048] Conceptually, a transformer enclosure for a large transformer is realized by means of a modular steel load frame that supports the weight of the large transformer. This frame holds at least three stainless steel containment basins and is connected to two guide rails arranged on the load frame in such a way that the weight of the large transformer, positioned on the guide rails, is transferred through the load frame to a foundation located below it. The load frame consists of at least three modules that can be reversibly connected.

[0049] For the realization of the invention, it is also advantageous to combine the aforementioned inventive configurations, embodiments and features of the claims in an appropriate arrangement. Examples of implementation

[0050] Further details, features, and advantages of embodiments of the invention will become apparent from the following description of exemplary embodiments with reference to the accompanying drawings. The exemplary embodiments are intended to describe the invention without limiting it. In particular, elements of the exemplary embodiments described below can be combined with elements of other exemplary embodiments disclosed herein. The drawings show: Fig. 1: a transformer stand, where part of the collection container cover is not shown, Fig. 2: a load frame with running rails attached to it, Fig. 3: three collection containers with cover mounting elements, Fig. 4: an exploded view of a transformer stand consisting of the foundation and transformer tray, Fig. 5A: a section of the edge of a transformer stand, and Fig. 5B: another section of a transformer stand.

[0051] In Fig. Figure 1 shows a transformer stand 1 consisting of a transformer enclosure 2 and a foundation 3 designed as a base plate. The transformer enclosure 2 has a load frame 4 on which the guide rails 5 are arranged. The load frame 4 has an upper frame 6, a lower frame 7, and force distribution elements 8 connecting the upper frame 6 and the lower frame 7. The force distribution elements 8 are suitable for transferring the weight of a large transformer from the guide rails 5 to the lower frame 7 and to the foundation 3 designed as a base plate. Therefore, at least a portion of the force distribution elements 8 is arranged close to the guide rails 5, in particular below the guide rails 5. Three collection tanks 9 are arranged in the load frame 4 to collect liquids, in particular rainwater and / or oil that has leaked from a large transformer. The load frame has at least three load frame modules 4.1, 4.2, 4.3.

[0052] The collection containers 9 are connected to each other by pipe elements 10. These pipe elements 10 ensure fluid exchange between the individual collection containers 9. These pipe elements 10 can be located externally or essentially between the collection containers 9. Pipe elements 10 located essentially between the collection containers 9 are described in Fig. 1 are shown, which is advantageous because the pipe elements 10 are then less susceptible to damage.

[0053] A pipe flange (not shown), for example a DN150 or DN200 pipe flange, can be attached, preferably welded, to a collection container. In an advantageous embodiment, a compensator is arranged in the pipe flange and can be sealed by means of an annular seal.

[0054] The collection containers 9 can also be fitted with cover mounting elements 11. A collection container cover 12 can be arranged on the cover mounting elements 11. Such a collection container cover 12 can be made of stainless steel and thus advantageously have a flame-retardant effect. Perforated plates 13 with openings are arranged in the edge region of the collection container cover 12, the openings being suitable for receiving liquid into the collection container 9. These perforated plates 13 can be implemented in the form of a grating. Part of the collection container cover 12 is not shown in this illustration.

[0055] According to a particularly advantageous embodiment, a cover plate 14, which can be designed as a drip tray, can be arranged circumferentially above the upper frame 6.

[0056] A load frame 4 with guide rails 5 is in Fig. Figure 2 shows that force distribution elements 8 are arranged below the guide rails 5, which transfer the weight of a large transformer downwards from the guide rails 5. In addition, the upper frame 6 and the lower frame 7 can be connected in other areas by rigid support elements 15. The support elements 15 can be less robust than the force distribution elements 8, since lower forces act in the edge region of the load frame 4. The illustration of the Fig. The upper frame 6 and lower frame 7 shown in Figure 2 have steel profiles.

[0057] The upper frame 6 and the lower frame 7 do not have to be continuous, but can be interrupted by force-dissipation elements 8. The individual modules of the upper frame 6 and the individual modules of the lower frame 7 can be arranged adjacent to the force-dissipation elements 8 and connected via the force-dissipation elements 8.

[0058] Three collection containers 9 are in Fig. Figure 3 shows that cover retaining elements 11 are arranged on the collection containers 9, which can be designed as parallel struts. The collection containers 9 can be made of stainless steel. These can be thin sheets with a thickness of only 3 mm. A circumferential edge 16 can also be arranged inside a collection container 9. This circumferential edge 16 can be part of the cover retaining elements 11.

[0059] In Fig. Figure 4 shows an exploded view of a transformer stand 1. Such a transformer stand 1 consists of a foundation 3 and a transformer tray 2. Above the foundation 3, the load frame 4 with the guide rails 5 is shown. Collection containers 9 can be arranged in this load frame 4. Collection container covers 12 and a cover plate 14 are also shown.

[0060] In the Fig. 5A and Fig. Figure 5B shows sections of a sectional view of a transformer station. A load frame 4, arranged on a foundation 3, is shown. This frame can be constructed, for example, from steel profiles such as HEB 140 steel beams. The collection tank 9 shown here rests on a layer of sand 18 located above the foundation 3. Cover mounting elements 11 are arranged on the collection tank 9, upon which a collection tank cover 12 rests. This illustration shows that the collection tank cover 12 has perforated plates 13 with openings, at least in some sections. Liquid can enter the collection tank 9 through these openings and be collected by it.

[0061] A drip edge 17 is also arranged on the collection container 9. An overlapping arrangement of the drip edge 17 and the edge of the collection container 9 advantageously ensures a tight connection between the drip edge 17 and the collection container 9.

[0062] Furthermore, in Fig. 5B a guide rail 5 is arranged above a force distribution element 8. The force distribution element 8 can transfer the weight force of a large transformer (not shown) arranged on the guide rail 5 downwards onto the subframe 7 and then onto the foundation 3. Reference symbol list 1 Transformer stand 2 transformer trays 3 Foundation 4 load frames 4.1 Load frame module 4.2 Load frame module 4.3 Load frame module 5 running rail 6 upper frames 7 subframes 8 force dissipation elements 9 collection containers 10 pipe elements 11 Cover mounting element 12 Collection container cover 13 perforated sheet metal 14 Cover plate 15 support elements 16 Circumferential edge 17 Eaves flashing 18 Sand layer QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 102 47 826 A1

[0006] DE 202 15 783 U1

[0006]

Claims

Transformer tray (2) for a large transformer with a mass of 30 t to 100 t, comprising: • A steel load frame (4) for transferring the weight of the large transformer, wherein the load frame (4) has at least three load frame modules (4.1, 4.2, 4.3) which can be reversibly connected to one another, • Two parallel and spaced-apart guide rails (5) made of steel for hoisting a large transformer, which are arranged on and / or above the load frame (4) and are connected to it in a force-transmitting manner, • Three stainless steel collection containers (9) which are arranged in the load frame (4), wherein the total volume of the collection containers (9) is at least 30 m3, and • A collection container cover (12) completely covering the collection containers (9), wherein the collection container cover (12) has openings for receiving liquid. Transformer tray (2) according to claim 1, characterized in that the load frame (4) has an upper frame (6), a lower frame (7) arranged at a distance therefrom, and force dissipation elements (8) connecting the upper frame (6) and the lower frame (7), wherein the load frame (4) has steel profiles. Transformer tray (2) according to claim 1 or 2, characterized in that at least one drip tray (17) is arranged on at least two of the collection containers (9). Transformer tray (2) according to one of claims 1 to 3, characterized in that the collection containers (9) have walls and that the walls have a thickness of 3 mm. Transformer tray (2) according to one of claims 1 to 4, characterized in that the collection containers (9) are connected by pipe elements (10) for liquid equalization. Transformer tray (2) according to one of claims 1 to 5, characterized in that the collection containers (9) are reversibly connected to the load frame (4). Transformer tray (2) according to one of claims 1 to 6, characterized in that at least three force dissipation elements (8) are arranged below the guide rails (5). Transformer tray (2) according to one of claims 1 to 7, characterized in that the guide rails (5) are designed as S49 rails. Transformer tray (2) according to one of claims 1 to 8, characterized in that the force transmission elements (8) comprise steel profiles and that the steel profiles have a mass per unit length in a range of 30 kg per meter to 70 kg per meter. Transformer tray (2) according to one of claims 1 to 9, characterized in that the openings of the collection container cover (12) are arranged in the edge region of the collection container cover (12). Transformer tray (2) according to one of claims 1 to 10, characterized in that the collection container cover (12) is made of a metal, preferably stainless steel. Transformer stand (1) comprising a large transformer, a foundation (3), and a transformer tray (2) arranged on the foundation (3) according to one of claims 1 to 11. Transformer stand (1) according to claim 12, characterized in that the foundation (3) is designed as a base plate. Transformer arrangement comprising a transformer stand (1) according to claim 12 or 13 and a large transformer, wherein the large transformer has a mass of at least 30 t and wherein the large transformer is arranged on the running rails (5).

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