Cooling device and manufacturing process for a planar electrical power transformer

Abstract

Electrical power transformer (10), comprising: a core (20); a first level ladder packing (40), comprising: a first planar conductive layer (42) arranged around a section of the core (20); a first planar insulating layer (44) arranged on a first side of the first planar conductive layer (42); and a second planar insulating layer (44) arranged on a second side of the first planar conductive layer (42); a second level ladder packing (40), comprising: a second plane conductive layer (42) arranged around the core (20); a third plane insulating layer (44) arranged on a first side of the second plane conductive layer (42); and a fourth plane insulating layer (44) arranged on a second side of the second plane conductive layer (42); and a cooling element (60, 80, 110) arranged on the first planar conductor packing (40), wherein the cooling element (60, 80, 110) comprises a horizontal planar section (82), a first vertical planar section (98A) and a second vertical planar section (98B), wherein at least one region of the horizontal planar section (82) is arranged between the first planar conductor packing (40) and the second planar conductor packing (40); wherein the first vertical planar section (98A) and the second vertical planar section (98B) comprise a plurality of cooling fins (112) which are spaced at least one apart from the first planar conductor packing (40), the second planar conductor packing (40) and the core (20); and wherein the cooling element (60, 80, 110) comprises a hollow body which is at least partially filled with a liquid (12).

Description

Technical field

[0001] The present invention relates to electrical power transformers and methods for manufacturing electrical power transformers. background

[0002] Electrical power transformers can generate heat during operation. Conventional power transformers do not necessarily dissipate this heat efficiently and / or may use coolants that are inefficient or expensive. Conventional power transformers may include coiled conductors, and reducing the heat from these conductors can present various challenges that differ from those associated with planar electrical power transformers.

[0003] US Patent 6,144,276 A discloses a planar electrical transformer comprising a core and multiple stacked layers of windings. Each layer comprises a dielectric substrate onto which metallic windings are applied on both sides. An insulating layer is provided on both sides of the substrate over the windings to insulate the layers from one another. Certain layers include a finned section that projects laterally beyond the layers above and below to improve heat dissipation from the transformer. A portion of the metallic windings running along the finned section is free of the insulating layer to further enhance heat dissipation. Other cooled transformers are disclosed in US Patents 2012 / 0092108A1, 3810303A, and 0122566A1. Summary

[0004] The object of the present invention is to provide an electrical power transformer with improved heat dissipation and a method for manufacturing such a power transformer.

[0005] This problem is solved by the subject matter of claims 1 and 13. The dependent claims specify advantageous embodiments of the invention.

[0006] The present invention comprises an electrical power transformer comprising a core, a first planar conductor packing, and a second planar conductor packing. The first and second conductor packings each comprise a conductive layer arranged around a section of the core, a first planar insulating layer arranged on a first side of the conductive layer, and a second planar insulating layer arranged on a second side of the conductive layer. The electrical power transformer includes a cooling element arranged on the first conductor packing. The cooling element comprises a horizontal planar section and a vertical planar section.At least one region of the horizontal planar section is arranged between the first conductor packing and the second conductor packing, wherein the first vertical planar section and the second vertical planar section comprise a plurality of cooling fins which are spaced at least one from the first planar conductor packing, the second planar conductor packing and the core; and wherein the cooling element comprises a hollow body which is at least partially filled with a liquid.

[0007] Furthermore, the invention comprises a method for manufacturing an electrical power transformer, comprising providing a core and providing a plurality of planar conductor packings. The conductor packings comprise a plurality of planar conductive layers and a plurality of planar insulating layers. The manufacturing process includes inserting at least one section of a cooling element between insulating layers of adjacent conductor packings. The cooling element comprises a horizontal planar section and a vertical planar section. At least a portion of the horizontal planar section is arranged between the adjacent conductor packings, the cooling element comprising a hollow body that is at least partially filled with a liquid, and the vertical planar section comprising cooling fins. Brief description of the characters Fig. Figure 1 shows an isometric view of sections of an embodiment of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 2 shows an isometric view of sections of an embodiment of a planar electrical power transformer according to the teaching of the present invention. The Fig. 3a and Fig. Figure 3b shows isometric views of areas of an embodiment of cores of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 4A shows a disassembled view of an embodiment of a conductor packing of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 4B shows an isometric view of an embodiment of a conductor packing of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 5 shows an isometric view of an embodiment of an electrical connection of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 6A shows an isometric view of an embodiment of a cooling element of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 6B shows a side view of an embodiment of a cooling element of a planar electrical power transformer according to the teaching of the present invention. Fig. Figure 7 shows an isometric view of areas of an embodiment of a planar electrical power transformer according to the teaching of the present invention. The Fig. Figures 8A to 8B show isometric views of embodiments of cooling elements of planar electrical power transformers according to the teaching of the present invention. Fig. Figure 8C shows a side view of an embodiment of a cooling element of a planar electrical power transformer according to the teaching of the present invention. Fig. Figures 9A to 9B show isometric views of embodiments of cooling elements of planar electrical power transformers according to the teaching of the present invention. Fig. Figure 10 shows an isometric view of an embodiment of a cooling element of a planar electrical power transformer according to the teaching of the present invention. Detailed description

[0008] Reference will now be made in detail to embodiments of the present invention, examples of which are described herein and illustrated in the accompanying figures.

[0009] In embodiments, such as generally in the Fig. 1 and Fig. As shown in Figure 2, a planar electrical power transformer 10 comprises a core 20 and a conductor packing 40. N , a connection 50 N (e.g., connections 501, 502, 503, and 504) and / or a cooling element. The cooling element can be, for example, at least one 60 mm cooling element. N (e.g., cooling elements 601, 602, 603, and 604), 80, or 110. The planar electrical power transformer 10 may also be referred to herein as transformer 10.

[0010] In embodiments, such as generally in the Fig. 3A and Fig. As shown in Figure 3B, a core 20 can be magnetic and comprise a first section 22 and a second section 26, which may be identical or mirror images, or not. The first section 22 and the second section 26 can each comprise a corresponding projection (e.g., the projections 24, 28 shown) for at least partially receiving, retaining, and / or supporting at least one conductor packing 40. N It can be configured. A plurality of conductor packs 40 N can, for example, without restriction, corresponding openings 46 N (cf. e.g. Fig. 4A and Fig. 4B) and the projections 24, 28 can be configured to open into the openings 46 together or independently (for example, relative to each other). N to be used and / or to pass through the openings 46 Nto extend. The core 20 can comprise at least one side wall (for example, the side walls 30A, 30B shown) and / or at least one open side (for example, the open sides 32A, 32B shown). The conductor packings 40 N In embodiments, they can extend between the side walls 30A, 30B and out of the open sides 32A, 32B.

[0011] In embodiments, such as in the Fig. 2, Fig. 4A and Fig. As shown in 4B, a ladder packing of 40 N (for example, ladder packs 401 to 40) 36 ) be flat and can have at least one conductive layer 42 N exhibiting, which can be flat, and / or at least an insulating layer 44 N include, which can be flat. According to embodiments, a conductor packing can be 40 N include an alternating layer configuration in which an insulating layer 44 Non each side (e.g. top and bottom) of each conductive layer 42 N is arranged. For example, a conductive layer 421 can be arranged between insulating layers 441 and 442; a conductive layer 422 can be arranged between insulating layers 442 and 443; a conductive layer 423 can be arranged between insulating layers 443 and 444; and / or a conductive layer 424 can be arranged between insulating layers 444 and 443. In embodiments, at least one of the plurality of conductive layers 42 can be arranged between insulating layers 443 and 444. N , the majority of insulating layers 44 N and / or a cooling element 60 N , 80, 11 at least partially arranged around the core 20. The conductive layers 42 Ncan effectively function as coils similar to those of a conventional transformer and, together with the core 20, which can be magnetic, can enable electrical energy applied to at least one terminal to be converted into 50 N is recorded, is transformed from an original voltage into another voltage, which is connected to at least one other terminal 50 N may be present.

[0012] In embodiments, such as generally in the Fig. 1, Fig. 2, Fig. 5 and Fig. As shown in 7, an electrical connection can be 50 N at least partially between adjacent conductor packings 40 N be arranged and / or extend laterally over the ladder packs 40 N extend beyond (e.g., from the open sides 32A, 32B). According to a non-restrictive example, an electrical connection can extend to 50 N a first section 52 Ninclude, which may be flat and / or at least partially between adjacent conductor packings 40 N It can be arranged (e.g., possibly horizontally). An electrical connection 50 N can a second section 54 N include, which is not between adjacent conductor packings 40 N It may be arranged. The first sections 52 N may or may not be located, at least partially, between a first core section 22 and a second core section 26. At or near an outer end 56 N (for example, the outer ends 561, 562, 563, 564) of a first section 52 N A second connection section 54 N be arranged, generally be arranged vertically, generally be arranged horizontally and / or generally perpendicular to a first section 52 N be arranged. The electrical connections 50 Ncan be configured as knife terminals. According to embodiments, a transformer 10 according to a non-limiting example can comprise four terminals 501, 502, 503, 504, each located at or near corresponding corners 34A, 34B, 34C, 34D of the conductor packings 40 N They may be arranged.

[0013] In embodiments, such as generally in the Fig. As shown, 1, 2 and 6A to 10, the transformer 10 can have at least one cooling element 60. N , 80,110 include. According to embodiments, as generally described in the Fig. 1, Fig. 2, Fig. 6A, Fig. 6B and Fig. As shown in 7, a cooling element can be 60 N a first section 62 N and / or a second section 66 N include. The first section 62 N can be used with the second section 66 N be connected and / or can be associated with the second section 66 Nin flowable joint (including the further disclosure herein). In embodiments, the first section 62 N and the second section 66 N form a unit body, which can generally be L-shaped, for example. The first section 62 N can generally be horizontal and / or can be at least partially between adjacent conductor packings 40 N be arranged. The first section 62 can be attached to at least one conductor packing 40 N be arranged. The second section 66 N can generally be vertical and / or can be at or near an outer end 64 N of the first section 62 N be (e.g. relative to a center point 40) A of the ladder packings 40 N ). The first section 62 N and the second section 66 Ncan be connected in at least one of a plurality of ways, such as at a right angle or in a curved configuration.

[0014] In embodiments, as generally described in the Fig. 6A, Fig. 6B and Fig. As shown in 7, a cooling element can be 60 N be configured as a heat pipe and / or heat bypass. The first section 62 N and the second section 66 N They can, for example, be hollow in general without restriction and / or can include a hollow segment. The first section 62 N and the second section 66 NThe fluid 12 may further comprise a fluid 12. The fluid 12 may comprise at least one of a plurality of compositions, such as one suitable for operation in a given environment or application. According to embodiments, the fluid 12 may comprise a liquid and / or may be referred to herein as a liquid 12, although this is not limiting. The liquid 12 may comprise at least one of a plurality of compositions. The liquid may, for example, without limitation, comprise glycol. If heat is generated by the transformer 10, the cooling element 60 may N According to embodiments, heat dissipation is supported, for example by convection. If heat is generated by the transformer 10, the heat can, for example, lower the temperature of the liquid 12 in the first section 62. N increase so that the liquid 12 is converted into vapor 14 and enters the second section 66 N moved. The second section 66N can be placed at a distance of 68 to (e.g. to avoid contact with) the conductor packings 40 N and / or be arranged around the core 20. A gap 68 can allow the second section 66 to N is exposed to a larger quantity of ambient air (which may be relatively cooler) than the air from the first section 62 N , and / or may enable the second section 66 N is cooler or is cooled cooler than the first section 62 N The distance 68 can, for example, be equal to the thickness 70 of the second section 66 without restriction. N it may be larger or smaller in certain embodiments.

[0015] When the steam 14 reaches the second section 66 N Once this temperature is reached, the steam 14 can begin to cool down according to embodiments and / or dissipate the heat generated by the transformer 10. The steam 14 in the second section 66 Ncan be cooled sufficiently to condense back into a liquid 12. If the vapor 14 in the second section 66 N condensed back into a liquid 12, the liquid 12 can return to the first section 62 N return. This process of heating the liquid 12 until it becomes steam 14, and cooling the steam 14 until it condenses back into a liquid 12, can be repeated and heat can be continuously dissipated if the transformer 10 continues to generate heat. The cooling element 60 N can be a closed system that can be designed such that the amount of liquid (e.g., a combined amount of liquid and vapor) within the cooling element is 60 N remains constant or is essentially constant (e.g., the liquid 12 or the vapor 14 cannot reach the cooling element 60) N added or removed). The cooling element 60 Ncan be designed to cool the transformer 10 independently of pumps or other devices that can cause the flow of liquid.

[0016] According to embodiments, the transformer 10 can accommodate a plurality of cooling elements 60. N include, for example, a first cooling element 601, a second cooling element 602, a third cooling element 603 and / or a fourth cooling element 604. According to embodiments, each cooling element 60 N with a different cooling element 60 N They may or may not be identical. In one embodiment, the first cooling element 601 and the second cooling element 602 can be located at or near a first end 48A of the conductor packings 40. N The first cooling element 601 and the second cooling element 602 can be arranged between terminals 501 and 502. They can be aligned with each other so that the first sections 621 and 622 are both located between adjacent conductor packings 40. Nextend over the same distance. The third cooling element 603 and the fourth cooling element 604 can be attached to or near a second end 48 B of the ladder packings 40 N The third cooling element 603 and the fourth cooling element 604 can be arranged between terminals 503 and 504. The third cooling element 603 and the fourth cooling element 604 can be aligned with each other so that the first sections 623 and 624 both extend the same distance between adjacent conductor packings. According to embodiments, the terminals 50 N and the cooling elements 60 N between the same pair of adjacent conductor packings 40 N be arranged. According to embodiments, 40 can be arranged between a pair of adjacent conductor packings. N at least one cooling element 60 N be arranged and include at least one additional cooling element 60 N can be between another pair of adjacent conductor packings 40 N be arranged.

[0017] According to embodiments, a cooling element 80, as generally described in the Fig. 8A, Fig. 8B and Fig. 8C, comprising a cooling layer and / or may be referred to herein as a cooling layer 80. The cooling layer 80 may function in the same or a similar way as a heat pipe. The cooling layer 80 may comprise a unit body comprising a horizontal section 82 and at least one vertical section (for example, the vertical sections 98A and 98B shown). A horizontal section 82 may be at least partially located between adjacent conductor packings 40. N be arranged and may have a shape that is the same or similar to the shape of the conductor packings 40 NThe horizontal section 82 can, for example, be configured without restriction as a rectangular prism or be similar thereto and can include an opening 84 configured to receive a projection (e.g., the projection 24 and / or the projection 28). In embodiments such as in Fig. As generally shown in Figure 8B, a horizontal section 82 can comprise a first part 86 and a second part 92, which may be spaced apart from and distinct from one another. In embodiments, the first part 86 and the second part 92 can be identical and / or can each generally be rectangular and have a semicircular recess 88, 94 configured to receive at least one region of at least one projection 24, 28. The first part 86 and the second part 92 can be arranged on opposite sides of the projections 24, 28, which can be arranged such that the semicircular recesses 88, 94 effectively serve as an opening similar to the opening 84 (e.g., the first part 86 and the second part 92 can be complementary).

[0018] In embodiments, the vertical sections 98A, 98B can be arranged at an outer edge 90, 96 of the horizontal section 82. In embodiments, the cooling layer 80 can comprise a plurality of vertical sections (the vertical sections 98A, 98B). A first vertical section 98A can, for example, be arranged without restriction at an outer edge 90 of the horizontal section 82, and a second vertical section 98B can be arranged at an opposite outer edge 96 of the horizontal section 82. According to embodiments, the first part 86 and the second part 92 can each comprise at least one vertical section (e.g., the first part 86 can comprise the vertical section 98A and the second part 92 can comprise the vertical section 98B). A vertical section 98A, 98B can be shaped like a rectangular prism or generally be similar to one.

[0019] In embodiments, such as generally in Fig. As shown in Figure 8C, a horizontal section 82 and / or vertical sections 98A, 98B can be hollow. In embodiments, a horizontal section 82 can be flow-connected with at least one vertical section 98A, 98B. The vertical sections 98A, 98B can, for example, be arranged without restriction on opposite sides of the horizontal section 82 (e.g., on opposite sides of the core 20), and vertical sections 98A, 98B and the horizontal section 82 can all be flow-connected with each other. A liquid 12 can be arranged in the horizontal section 82. As described above generally with reference to the cooling elements 60. NAs described, the liquid 12 can be heated when the transformer 10 generates heat (or when the horizontal section 82 is heated otherwise), causing the liquid to turn into vapor 14 and flow into the vertical sections 98A, 98B. The vertical sections 98A, 98B can be located at a distance 100 from (e.g., so that they are not in contact with) the conductor packings 40. N and / or the core 20, which exposes a larger number of vertical sections 98A, 98B to the ambient air, can allow the vertical sections 98A, 98B to be cooler than the horizontal section 82 and / or can allow the vertical sections 98A, 98B to dissipate heat efficiently. The spacing 100 can be approximately equal to the thickness 102 of the vertical sections 98A, 98B in just one example, but can be smaller or larger in certain embodiments.

[0020] In embodiments, such as generally in the Fig. 9A, Fig. 9B and Fig. As shown in 10, a cooling element 110 can have at least one cooling fin 112. N include, which is at a distance of 114 from (so that it is not in contact with, for example, the core 20 and / or the conductor packings 40 N be arranged. The cooling struts 112 N They can facilitate the dissipation of heat generated by the transformer 10, such as through thermal conduction. The cooling fins 112 N can be connected, for example, without restriction to a cooling layer 116 of a cooling element 110, which can be flat and / or between adjacent conductor packings 40 N can be arranged. The cooling layer 116 can absorb heat generated by the transformer 10 and the cooling fins 112 N They can efficiently extract the heat from the cooling layer 116. The cooling ribs 112 Ncan then allow the absorbed heat to be dissipated into the ambient air, which can support cooling of the transformer 10.

[0021] According to embodiments, the cooling layer 116 can comprise a single, uniform body, which can be of a general rectangular shape, which can be generally flat and which has webs 112. NThe cooling layer 116 may comprise a first part 122 and a second part 124, which may be arranged at a first end 118 and / or at a second end 120. In other embodiments, the cooling layer 116 may comprise a first part 122 and a second part 124, which may be identical or similar in design to the first part 86 and the second part 92, respectively, of the horizontal region of the cooling element 80. The first part 122 and the second part 124 of the cooling layer 116 may, for example, be generally flat without limitation, have a general rectangular shape, and / or include semicircular recesses 126, 128 configured to receive at least one projection 24, 28. In embodiments, the first part 122 may comprise the first end 118 and a first plurality of the webs 112. N can be arranged at the first end 118 of the first part 122. The second part 124 can comprise the second end 120 and a second plurality of webs 112. Ncan be arranged at the second end 120 of the second part 124. The cooling layer 116 and the webs 112 N The cooling layer 116 can be solid, hollow, or a combination of both in its embodiment. It can comprise at least one of a variety of materials, such as materials with high thermal conductivity (e.g., aluminum, copper, a graphite pad, etc.).

[0022] In embodiments, the cooling struts 112 N generally arranged vertically. At least one cooling rib 112 N It can generally be flat and / or can generally have a rectangular shape. The cooling bridge 112 N can be the same or similar to any other, or at least a cooling bridge 112 N can be separated from at least one other cooling bridge 112 Ndiffer. In embodiments, the cooling webs can be connected to the cooling layer 116 at or near a corner of conductor packings and / or the core (e.g., at least one corner 34A, 34B, 34C, 34D). The cooling webs 112 N can be located laterally outside the connections 50 N be arranged (e.g. as in Fig. 10 is generally shown) and / or can be used between the 50 connections. N be arranged. The cooling struts 112 N They can be solid, hollow, and / or a combination of solid and hollow. In embodiments, the element 110 can be a heat tube (e.g., similar to the cooling elements 60). N , 80) be trained. The bridges 112 N and the cooling layer 116 can, for example, be hollow without restriction and can comprise a liquid. In other embodiments, the webs 112 N and the cooling layer 116 should be solid.

[0023] In embodiments, a method for manufacturing a transformer 10 may involve providing a core 20, a plurality of conductor packings 40 N , a plurality of connections 50 N and / or at least one cooling element 60 N , 80, 110. At least one of the ladder packs 40 N can be arranged around a first section 22 of the core 20 (e.g. such that the projection 24 extends through the openings 46) N extends). Then the connections can be 50 N , and / or the cooling elements 60 N , 80, 110 on the ladder packs 40 N , be arranged. Next, at least one additional ladder pack of 40 can be added. N at the connections 50 N and / or the cooling elements 60 N , 80, 110 are arranged. Next, a second section 26 of the core 20 can be arranged so that the projection 28 extends into and through the openings 46. Nthe additional ladder packs 40 N extends and such that the second section 26 is aligned with the first section 22. Although an example of a method for manufacturing an embodiment of a transformer 10 according to the present invention is provided, the present invention is not limited to the specific sequence or steps described above, and various steps may be carried out in a different order.

Claims

[1] Electrical power transformer (10), comprising: a core (20); a first level ladder packing (40), comprising: a first planar conductive layer (42) arranged around a section of the core (20); a first planar insulating layer (44) arranged on a first side of the first planar conductive layer (42); and a second planar insulating layer (44) arranged on a second side of the first planar conductive layer (42); a second level ladder packing (40), comprising: a second plane conductive layer (42) arranged around the core (20); a third plane insulating layer (44) arranged on a first side of the second plane conductive layer (42); and a fourth plane insulating layer (44) arranged on a second side of the second plane conductive layer (42); and a cooling element (60, 80, 110) arranged on the first planar conductor packing (40), wherein the cooling element (60, 80, 110) comprises a horizontal planar section (82), a first vertical planar section (98A) and a second vertical planar section (98B), wherein at least one region of the horizontal planar section (82) is arranged between the first planar conductor packing (40) and the second planar conductor packing (40); wherein the first vertical planar section (98A) and the second vertical planar section (98B) comprise a plurality of cooling fins (112) which are spaced at least one apart from the first planar conductor packing (40), the second planar conductor packing (40) and the core (20); and wherein the cooling element (60, 80, 110) comprises a hollow body which is at least partially filled with a liquid (12). [2] Electrical power transformer according to claim 1, wherein the cooling element (60, 80, 110) comprises a plurality of separate parts (86, 92, 122, 124) which are arranged at least partially around the section of the core (20). [3] Electrical power transformer according to claim 1 or 2, wherein the electrical power transformer (10) is designed as a planar electrical power transformer (10). [4] Electrical power transformer according to one of the preceding claims, wherein the hollow body comprises a planar first section (62) extending away from the conductor packing (40). [5] Electrical power transformer according to claim 4, wherein the hollow body comprises a second section (62) extending perpendicular to the first section (62) of the hollow body. [6] Electrical power transformer according to one of the preceding claims, wherein the cooling element (60, 80, 110) comprises a solid flat body arranged between the first conductor packing (40) and the second conductor packing (40); and wherein the plurality of cooling webs (112) extend from the solid flat body over the first conductor packing (40) and the second conductor packing (40). [7] Electrical power transformer according to one of the preceding claims, wherein the cooling element (60, 80, 110) is a first cooling element (60, 80, 110) and the electrical power transformer (10) also comprises a second cooling element (60, 80, 110), and wherein the first cooling element (60, 80, 110) and the second cooling element (60, 80, 110) are both partially arranged between the first conductor packing (40) and the second conductor packing (40). [8] Electrical power transformer according to claim 7, wherein the first cooling element (60, 80, 110) extends away from a first side of the electrical power transformer (10); and the second cooling element (60, 80, 110) extends away from the second side of the electrical power transformer (10). [9] Electrical power transformer according to claim 7 or 8, wherein the first cooling element (60, 80, 110) and the second cooling element (60, 80, 110) each comprise a hollow body comprising a liquid (12) configured to (i) be heated by the heat generated during the operation of the electrical power transformer (10) and (ii) dissipate the heat generated during the operation of the electrical power transformer (10) by cooling and / or condensation. [10] Electrical power transformer according to one of the preceding claims, wherein the first vertical planar section (98A) and the second vertical planar section (98B) is not in contact with any of the plurality of conductor packings (40) and is not in contact with the core (20). [11] Electrical power transformer according to one of the preceding claims, wherein the first vertical planar section (98A) and the second vertical planar section (98B) are in flow connection with the horizontal section (62, 82). [12] Electrical power transformer according to one of the preceding claims, wherein the first vertical planar section (98A) and the second vertical planar section (98B) are arranged at a distance (68) from the conductor packings (40) and the core (20). [13] Method for manufacturing an electrical power transformer (10), the method comprising: a provision of a core (20); a provision of a plurality of planar conductor packings (40), wherein the planar conductor packings (40) comprise a plurality of planar conductive layers (42) and a plurality of planar insulating layers (44); and a cooling element (60, 80, 110) being inserted between insulating layers (44) of adjacent conductor packings (40) from the plurality of planar conductor packings (40), wherein the cooling element (60, 80, 110) comprises a horizontal planar section (62, 82) and a vertical planar section (66, 98), and wherein at least one region of the horizontal planar section (62, 82) is arranged between the adjacent conductor packings (40), wherein the cooling element (60, 80, 110) comprises a hollow body which is at least partially filled with a liquid (12), wherein the vertical planar section (66, 98) includes cooling webs (112). [14] Method according to claim 13, further comprising inserting at least one section of the core (20) into the plurality of planar conductor packings (40). [15] Method according to claim 14, wherein the core (40) comprises an upper section (26) and a lower section (22) which are independently inserted into openings (46) from the plurality of planar conductor packings (40). [16] Method according to any one of claims 13 to 15, wherein the vertical planar section (66, 98) comprises a heat pipe.

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