Rectangular tubular conductor busbar with solid core and internal heat dissipation structure

Abstract

The present invention relates to a rectangular tubular conductor busbar having a solid core and an internal heat dissipation structure, designed to have a rectangular tubular shape, for use in electrical cabinets and prefabricated electric wires for low and high voltage power switchgear. The main structure comprises a rectangular tubular busbar (P) in the shape of a substantially parallelepiped, the rectangular tubular busbar (P) having a body (1) delimited by an outer wall and a solid core (2) formed by overlapping elements, the thickness of which is three times the thickness of the wall forming the body (1). And the solid core body is positioned between the upper wall and the lower wall of the main body (1). The rectangular tubular busbar (P) is constituted by two different regions: a hollow region (A1) defined between the rear surface of the rectangular tubular busbar (P) and the upper and lower surfaces of the tubular busbar (P), and a solid core (2) defined between the rear surface of the rectangular tubular busbar (P) and the upper and lower surfaces of the tubular busbar (P). And the solid core (2) is located in a region defined by the front surface of the rectangular tubular busbar (P), the upper and lower walls of the rectangular tubular busbar (P), and the hollow region (A1).

Description

TECHNICAL FIELD

[0001] The present invention relates to an electrical conductor busbar, more specifically, to a rectangular tubular conductor busbar, also known as flat busbar, having a solid core and an internal heat dissipation structure, applied in electrical cabinets and prefabricated electrical lines (busbar ducts / armored busbars) for low, medium and high voltage power switching devices. BACKGROUND

[0002] Low, medium and high voltage power switching devices are essential for any electrical installation in all areas of economic activity. Such assemblies are intended to be used with devices designed for the control of devices for the generation, transmission, distribution and conversion of electrical energy and for the consumption of electrical energy. These assemblies consist of electrical cabinets, functional units with individual devices installed and busbar systems.

[0003] The busbar system is a low impedance conductor to which multiple circuits can be individually connected. The role of the low impedance conductor is to conduct electrical energy between various points in the assembly and its size determination should take into account the following factors: a) the temperature rise caused by the flow of electrons under normal operating conditions, which is related to the choice of the material used; b) thermal and dynamic stresses caused by unusual situations such as voltage and current peaks, short circuits and accidental arcs; c) leakage currents caused by the proximity between conductors and between conductors and metal parts of the electrical cabinet; and d) the number and way in which connections and branches are made.

[0004] Considering these inherent characteristics of the electrical busbar, the electrical busbar is almost entirely manufactured from copper busbars with rectangular cross-section, since copper has good electrical conductivity, has a relatively low manufacturing cost compared to other conductor materials such as silver and gold, and has a higher mechanical strength than aluminum, another commonly used conductor for industrial purposes.

[0005] The conductor busbar is greatly affected by the skin effect when subjected to high values of alternating current, in which the useful area for electrical conduction is reduced, since the alternating current tends to concentrate on the periphery of the conductor, thus reducing the current density inside.

[0006] As a result of the skin effect, more material is used in the production of solid busbars, thus increasing the cross-sectional area of the solid busbar to ensure a low apparent resistance conductor, which reduces the negative effects of the skin effect, resulting in a more efficient busbar.

[0007] with low current density / mm 2Rectangular profile solid bars are almost exclusively used in copper busbar applications for electrical cabinets. This configuration is usually found in various sizes, such as 100 x 10 mm, 80 x 10 mm, 50 x 10 mm and others.

[0008] Other shapes of busbars are also used, one example being the one with the busbar with the purpose of increasing the perimeter, improving heat dissipation and reducing losses caused by the skin effect, thus optimizing the current density in the material used for high currents, thus being able to use less material for the construction of the busbar, found in document BR10 201 8068 113-3, filed on September 6, 2018.

[0009] Another example of tubular busbar known in the prior art is the subject of patent document BR10 201 7 019 384-5, which proposes an electrical cabinet assembly comprising a primary conductor busbar and a secondary conductor busbar configured to close a tubular shape, the primary conductor busbar and the secondary conductor busbar being installed in the electrical cabinet assembly, the electrical cabinet assembly also comprising an insulator and a secondary insulator, a protection system on the primary conductor busbar, an extender assembly and a final branch connector.

[0010] In addition, another patent document that relates to a tubular busbar applied in electrical cabinets is the subject of patent document BR 10202 0 003 216-0, which relates to an electrical conductor busbar, more specifically, a conductor busbar with a sinusoidal tubular shape, applied in electrical cabinets and preformed wires for low and high voltage power switchgear. The busbar has an initial crimping tab connected to a first sinusoidal wave, which in turn is connected to a joining tab, which in turn is connected to a second sinusoidal wave, so that the first sinusoidal wave and the second sinusoidal wave form a tubular region between them, in which there is no contact between the first sinusoidal wave and the second sinusoidal wave. The second sinusoidal wave is connected to a final crimping tab, or to a second joining tab, which is connected to a third sinusoidal wave, which is connected to a final crimping tab.

[0011] Another technical problem present in the documents mentioned as examples of the prior art relates to the heat dissipation of the busbar, since electrical conductivity varies with temperature, and in some cases, due to the skin effect, the contact area between the walls of the tubular electrical busbar tends to undergo a significant increase in temperature, which can affect the performance of the tubular electrical busbar in certain applications.

[0012] In addition, another technical problem present in the documents mentioned as examples of the prior art is that the tubular busbar has a configuration with a different shape than the conventional busbar, making it difficult to simply replace the conventional busbar with the tubular busbar in the electrical cabinet.

[0013] Therefore, the prior art would benefit from rectangular tubular busbars having dimensions similar to conventional solid busbars, facilitating the replacement of one rectangular tubular busbar with another in an electrical cabinet. In addition, it would be advantageous to prioritize solutions for the internal heat exchange of the rectangular tubular busbar and the consequent reduction in temperature rise, allowing the rectangular tubular busbar to operate for longer at temperatures that enable better electrical conductivity, especially for high currents. SUMMARY

[0014] The present invention provides a busbar in a rectangular tubular shape configuration with a solid core, which has superior mechanical resistance compared to solid conductor busbars, with improved electrical conductivity efficiency by reducing the amount of material used compared to traditional systems. In addition, the busbar also includes internal air channels for heat dissipation, taking advantage of the skin effect. This results in a reduction in cross-sectional area, increasing the current density in the conductor, optimizing material use and space, and facilitating the assembly of multiple busbars together to increase current capacity.

[0015] An object of the present invention is to provide a busbar that can carry higher currents with less material by varying (increasing or decreasing) the size of the solid and hollow portions, thus optimizing the amount of material suitable for the required capacity, thus contributing to the sustainability of the use of materials.

[0016] Another object of the present invention is to provide a rectangular tubular busbar with internal air channels to reduce temperature rise by heat dissipation of the conductor at high currents.

[0017] Another object of the present invention is to provide a busbar that enhances the use of the skin effect by using a tubular shape, with less material in the internal area of the conductor.

[0018] Another object of the present invention is to provide a structurally reinforced busbar with a rectangular tubular shape formed by at least 10 sequences of bends to withstand the dynamic forces and vibrations to which the busbar is subjected both under normal operating conditions and under stress situations, such as during a short circuit.

[0019] Another object of the present invention is to provide a busbar that can internally dissipate heat through the air channels, thus improving its electrical conductivity.

[0020] Another object of the present invention is to provide a rectangular tubular conductor busbar made of copper, aluminum or bimetallic material.

[0021] Finally, an object of the present application is to provide a busbar having different constructive characteristics, but similar dimensions to the conventional solid busbar, thus allowing the replacement of one busbar with another in various electrical cabinets. BRIEF DESCRIPTION OF DRAWINGS

[0022] The subject of the present report will be fully understood in its technical aspects through the detailed description based on the relative drawings, in which: Figure 1 shows a front perspective view of a rectangular tubular conductor busbar in its main configuration, comprising an internal core and having a tubular area, and an internal air passage channel through the core in the transverse direction; Figure 2 shows a top view of a rectangular tubular conductor busbar in its main configuration; Figure 3 shows a left side view of a rectangular tubular busbar in its main configuration, in which the tubular profile can be observed, comprising an internal core of the rectangular tubular busbar formed by the junction of three overlapping walls embedded between the upper and lower walls of the main body; Figure 4 shows a detailed view of the profile of a rectangular tubular conductor busbar in its main configuration in a front perspective view, allowing the observation of the assembly and assembly details of the rectangular tubular conductor busbar and the transverse air inlet and outlet holes; Figure 5 shows a cross-sectional view of a rectangular tubular busbar in its main configuration in a front perspective view, allowing the observation and identification of the transverse air inlet and outlet holes in cooperation with the internal air passage channel through the core; Figure 6 shows a perspective view of a rectangular tubular conductor busbar in its main variant, comprising an internal core having a through hole and an internal air passage channel in the transverse direction.

[0023] Figure 7 shows a top view of a rectangular tubular conductor busbar in its main variant; Figure 8 shows a side view of a rectangular tubular conductor busbar in its main variant, in which the tubular profile can be observed, comprising an internal core of the rectangular tubular conductor busbar formed by the junction of three overlapping walls; Figure 9 shows a detail of the profile of a rectangular tubular conductor busbar in its main variant in a front perspective view, allowing the observation of the assembly and assembly details of the rectangular tubular conductor busbar and the transverse air inlet and outlet holes aligned with the internal air passage channel through the core; Figure 10 shows a cross-sectional view of a rectangular tubular conductor busbar in its main variant in a perspective view in which the transverse cooling holes in cooperation with the internal cooling passage present in the core of the rectangular tubular conductor busbar can be observed and identified; Figure 11 shows a front perspective view of the rectangular tubular conductor busbar in its second constructive variant, comprising an internal core with through holes aligned in one line in parallel; Figure 12 shows a top view of the rectangular tubular conductor busbar in its second constructive variant; Figure 13 shows a side view of the rectangular tubular conductor busbar in its second constructive variant, in which the tubular profile can be observed, comprising the internal core of the rectangular tubular conductor busbar formed by the junction of three overlapping walls located between the upper and lower walls of the main body; Figure 14 shows a detail of the profile in front view of the rectangular tubular conductor busbar in its second constructive variant, thus being able to observe the internal details of the rectangular tubular conductor busbar and the vertical air passage holes for heat dissipation; Figure 15 shows a front perspective view of the rectangular tubular conductor busbar in its third constructive variant, comprising an internal core with through holes aligned in two lines in parallel; Figure 16 shows a top view of the rectangular tubular conductor busbar in its third constructive variant; Figure 17 shows a side view of the rectangular tubular conductor busbar in its third constructive variant, in which the tubular profile can be observed, comprising the internal core of the rectangular tubular conductor busbar formed by the junction of three overlapping walls located between the upper and lower walls of the main body; Figure 18 shows a detail of the profile in front view of the rectangular tubular conductor busbar in its third constructive variant, thus being able to observe the internal details of the rectangular tubular conductor busbar and the vertical air passage holes for heat dissipation; Figure 19 shows an example of the rectangular tubular conductor busbar in front perspective view, thus outlining the embodiment using two conductor materials; Figure 20 a perspective side view of the rectangular tubular conductor busbar is shown in order to better show the air passage channels; and Figure 21 a set of three images with transversal cuts is shown, aimed at showing the configuration of the air passage channels within the rectangular tubular conductor busbar. DETAILED DESCRIPTION

[0024] According to the mentioned figures, as shown in the figures attached, the present invention "Rectangular tubular conductor busbar with solid core and internal heat dissipation structure" comprises a rectangular tubular busbar (P) with a shape substantially parallelepiped, with a main body (1) delimited by an outer wall and a solid core (2) formed by the embedded overlap of elements, which is three times the thickness of the wall that forms the main body (1).

[0025] The rectangular tubular busbar (P) is designed for electrical cabinets, in particular for low, medium and high voltage power switchgear and prefabricated electrical lines. The shape of the rectangular tubular busbar (P) is substantially the same and equivalent to that of a conventional solid electrical busbar, thus allowing a direct replacement of one rectangular tubular busbar with another in an electrical cabinet without the need for complex adjustments or modifications. The rectangular tubular busbar (P) also allows the use of insulators and other elements that are more common in the rectangular tubular busbar (P) compared to conventional solid busbars.

[0026] In the rectangular tubular busbar (P) mentioned, the element that delimits the substantially parallelepiped shape of the rectangular tubular busbar (P) is the main body (1) of the rectangular tubular busbar (P), formed by an outer wall subdivided into a front wall, an upper wall, a rear wall and a lower wall, the main body (1) itself having two distinct areas, a hollow area (A1) and a solid core (2), wherein the hollow area (A1) is delimited between the rear surface of the rectangular tubular busbar (P) and the upper and lower surfaces of the rectangular busbar (P) and the solid core (2).

[0027] As can be seen in Figures 3 and 4, the solid core (2) is located in the area delimited by the front surface of the rectangular tubular busbar (P), the upper and lower walls of the rectangular tubular busbar (P) and the hollow area (A1).

[0028] The rectangular tubular busbar (P) also has air inlet holes (9) distributed across the entire front surface of the rectangular tubular busbar (P). These air inlet holes (9) have a substantially rectangular shape and pass through the wall thickness of the main body (1).

[0029] The air inlet holes (9) of the tubular busbar (P) serve as air inlets for the internal cooling of the rectangular tubular busbar (P) itself. These air inlet holes (9) form air duct passages (4) through the solid core (2), thus establishing a continuous air duct between the outer area of the rectangular tubular busbar (P) and the hollow area (A1).

[0030] In the hollow area (A1), and in particular on the rear wall of the main body (1) of the rectangular tubular busbar (P), there are air inlet and outlet holes (3) arranged along their entire extension. These holes are aligned with and equidistant from each other and have the function of providing an outlet for the air that enters the rectangular tubular busbar (P) through the air duct passages (4) of the solid core (2).

[0031] The solid core (2) of the rectangular tubular busbar (P) is a solid component designed for the connection and mechanical structural element that provides resistance to the rectangular tubular busbar (P), thus allowing the rectangular tubular busbar (P) to withstand potential short circuit demands and other conditions. In this regard, the solid core (2) of the rectangular tubular busbar (P) has a series of square-shaped structural openings (8) that allow horizontal air circulation within the solid core (2) and enable the installation of secondary elements on the rectangular tubular busbar (P).

[0032] The rectangular tubular busbar (P) has a first configuration variant, which is referred to as rectangular tubular busbar (B), which is in the shape of a substantially parallelepiped, which has a main body (1) delimited by an outer wall and a solid core (2) formed by the overlap of the elements, which is three times the thickness of the wall that forms the main body (1).

[0033] In the rectangular tubular busbar (B) described above, the element that defines the substantially parallelepiped shape of the rectangular tubular busbar (B) is the main body (1) of the rectangular tubular busbar (B), which is formed by an outer wall subdivided into a front wall, an upper wall, a rear wall and a lower wall. The rectangular tubular busbar (B) has two recessed areas (1a and 1b), wherein the upper recessed area (1a) is located on the upper surface of the rectangular tubular busbar (B) and the lower recessed area (1b) is located on the lower surface of the rectangular tubular busbar (B), and these recessed areas (1a and 1b) are not aligned. As can be observed in Figure 6 and especially in Figures 8 and 9, with regard to this misalignment, the upper recessed area (1a) is closer to the upper part of the rectangular tubular busbar (B), while the lower recessed area (1b) is closer to the solid core (2) of the rectangular tubular busbar (B).

[0034] On the front and rear parts of the rectangular tubular busbar (B), the rectangular tubular busbar (B) has transverse air inlets and outlets (3) that allow air circulation inside the rectangular tubular busbar (B). As can be seen in Figure 10, these transverse air inlets and outlets (3) are interconnected by air channel passages (4) for heat dissipation, wherein the air channel passages (4) are located within the main body (1), thus passing through the solid core (2). The transverse air inlets and outlets (3) are transverse with respect to the front and rear walls of the main body (1) of the rectangular tubular busbar (B).

[0035] With regard to the transverse air inlets and outlets (3), these have a rhombus shape, wherein the rhombus passes through the upper and lower walls of the main body (1) of the rectangular tubular busbar (B). The interconnection between these upper and lower transverse air inlets and outlets (3) is achieved by air channel passages (4) for internal heat dissipation, and each air channel passage is delimited by an air channel area within the main body (1), thus passing through the solid core (2).

[0036] The solid core (2) of the rectangular tubular busbar (B) is a solid component designed for the connection pieces and is a mechanical structural element that provides resistance to the rectangular tubular busbar (B), thus allowing it to withstand potential short circuit demands and other conditions. In this sense, the solid core (2) is located in the central region of the rectangular tubular busbar (B) and extends along the entire length of the central region, which is composed of the overlap of three sections of the same width as the walls of the main body (1), thus occupying the entire internal space of the rectangular tubular busbar (B), i.e., simultaneously in contact with the upper and lower walls of the main body (1). In addition, as can be seen more clearly in Figure 8, the solid core (2) of the tubular busbar (B) is shaped to be locked and the blank ends are locked together. This configuration provides greater mechanical strength to the tubular busbar (B), thus making the assembly more rigid.

[0037] The rectangular tubular busbar (B) also has a series of mounting holes (5) in the core region (2), which pass through and cross the upper and lower walls of the main body (1) and the solid core (2) in the core region (2). The mounting holes (5) are arranged symmetrically in a straight line in the solid portion of the rectangular tubular busbar (B) and equidistant from each other.

[0038] The presence of the solid core (2) in the rectangular tubular busbar (B) allows the identification of two distinct regions within the rectangular tubular busbar (B), which are the hollow region (Al), the hollow region (A2) and the solid core (2). The hollow region (A2) comprises the space formed between the front wall, the upper wall and the lower wall of the main body (1) and the solid core (2), while the hollow region (Al) comprises the space formed between the rear wall, the upper wall and the lower wall of the main body (1) and the solid core (2). These hollow regions (Al and A2) are only communicated by the internal air passage (4).

[0039] The aforementioned mounting holes (5) in the rectangular tubular busbar (B) are mainly used to assist in the assembly of the rectangular tubular busbar (B) in their respective equipment, thus facilitating the attachment of power branches and secondary elements, as well as reducing weight and saving material.

[0040] As can be seen in Figure 9, the rectangular tubular busbar (B) also has mounting grooves (6) located at the ends of the rectangular tubular busbar (B), which are formed by the internal air passage (4) and the access air holes (3), which are segmented near their central region.

[0041] The present invention also comprises a constructive variant of the rectangular tubular busbar (B) denoted as rectangular tubular busbar (B'), wherein the main difference of this variant is the replacement of the lateral air inlet and outlet holes (3) by air duct openings (7) and internal air duct passages (4) through the solid core (2).

[0042] The internal air duct openings (7) are arranged perpendicular to the upper and lower walls of the body (1) and along three lines: one line in the hollow area (Al) and two lines in the hollow area (A2). The first line in the hollow area (A2) is located between the front wall and the two recessed areas (la and lb), while the second line in the hollow area (A2) is located between the solid core (2) and the recessed areas (la and lb).

[0043] The internal air duct openings (7) are equidistant from each other along each of the three lines, and each of said internal air duct openings (7) is substantially rectangular in shape and is through, which means that the internal air duct openings (7) pass through both the front and rear walls, thus forming internal air ducts for the dissipation of heat of the rectangular tubular busbar (B').

[0044] The rectangular tubular busbar (B) comprises a second constructive variant denoted as (B") wherein the second constructive variant denoted as (B") is identical in construction to the first constructive variant (B') but with two rows of mounting holes (5) arranged on the solid core area (2).

[0045] The rectangular tubular busbar (P) and the tubular busbar (B) and their constructive variants (B' and B") stand out from other electrical busbars in the state of the art mainly due to their rectangular tubular construction with a solid core (2), while the other busbars are of solid tubular construction or closed tubular construction. Thus, the rectangular tubular busbar (P, B) offers a significant material saving in its construction, thus reducing production costs and the impact on the natural reserves of the elements used in its construction, such as copper, aluminum, gold and silver.

[0046] Another advantage of the rectangular tubular busbar (P and B) and their constructive variants (B' and B") is their high mechanical resistance. The arc-shaped wall construction enhances the mechanical strength compared to solid rectangular busbars, resulting in minimal deformation when subjected to high-level short circuit tests.

[0047] Finally, another advantage of the rectangular tubular busbar (P and B) and their constructive variants (B' and B") is the presence of lateral air inlet and outlet holes (3), internal air duct passages (4) through the solid core (2), and internal air duct openings (7), allowing effective heat exchange between the busbars (P, B, B' and B"), facilitating the operation of the busbars (P, B, B' and B") within a temperature range that does not affect their electrical conductivity.

[0048] It is to be understood that this description is not meant to limit the application to the specific details described herein, and that the application can have other embodiments and can be practiced or carried out in ways other than those specifically described. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. A rectangular tubular conductor busbar, composed of an electric conductor material or of a combination of two electric conductor materials, having a rectangular tubular shape, which is applied in electrical cabinets and prefabricated electric lines for low-, medium- and high-voltage power switching devices, characterized in that, In the main configuration of the rectangular tubular conductor busbar, the rectangular tubular conductor busbar comprises a rectangular tubular busbar (P) substantially shaped as a parallelepiped, having a main body (1) delimited by an outer wall and a solid core (2) formed by overlapping elements, which is three times the thickness of the wall forming the main body (1) and is located between the upper and lower walls of the main body (1); the rectangular tubular busbar (P) has two distinct areas, a hollow area (A1) and a solid core (2), wherein the hollow area (A1) is delimited between the rear surface of the tubular busbar (P) and the upper and lower surfaces of the rectangular tubular busbar (P), and the solid core (2) is located in the area delimited by the front surface of the rectangular tubular busbar (P), the upper and lower walls of the rectangular tubular busbar (P) and the hollow area (A1).

2. The busbar of claim 1, wherein The main body (1) is the element that defines the basic shape of the rectangular tubular busbar (P), which is subdivided into a front wall, an upper wall, a rear wall and a lower wall.

3. The busbar according to claims 1 and 2, characterized in that The rectangular tubular busbar (P) has an air inlet hole (9) provided through the front surface of the rectangular tubular busbar (P), wherein the air inlet hole (9) has a substantially rectangular shape, passing through the wall thickness of the main body (1).

4. The busbar according to claims 1, 2 and 3, characterized in that, The air inlet hole (9) forms an air duct passage (4) that passes through the solid core (2), establishing a continuous air duct between the external area of the tubular busbar (P) and the hollow area (A1).

5. The busbar of any one of claims 1 to 4, wherein, In the hollow area (A1), in particular in the rear wall of the main body (1) of the rectangular tubular busbar (P), there are arranged along their entire extension direction inlet and outlet air holes (3) aligned with each other and equidistant from each other, having the function of providing an air outlet for the air entering the rectangular tubular busbar (P) through the internal air duct passage (4) passing through the solid core (2).

6. The busbar of claim 1, wherein, The solid core (2) of the rectangular tubular busbar (P) has a series of square-shaped structural openings (8), allowing horizontal air circulation inside the solid core (2) of the rectangular tubular busbar (P) and enabling the fixing and mounting of connections on the rectangular tubular busbar (P).

7. Rectangular tubular busbar (P) according to any one of claims 1 to 6 in a first construction variant, characterized in that The rectangular tubular conductor busbar is a rectangular tubular busbar (B) delimited by a body (1) formed by an outer wall subdivided into a front wall, an upper wall, a rear wall and a lower wall, wherein the rectangular tubular busbar (B) has two recessed areas (1a and 1b), wherein the recessed area (1a) is located on the upper surface of the rectangular tubular busbar (B) and the recessed area (1b) is located on the lower surface of the rectangular tubular busbar (B) and the recessed areas (1a and 1b) are not aligned, wherein the recessed area (1a) is closer to the upper part of the rectangular tubular busbar (B) and the recessed area (1b) is closer to the core (2) of the tubular busbar (B); the rectangular tubular busbar (B) comprises a hollow area (A1), a hollow area (A2) and a solid core (2), wherein the hollow area (A2) comprises the space formed between the front wall, the upper wall and the lower wall of the body (1) and the solid core (2) and the hollow area (A1) comprises the space formed between the rear wall, the upper wall and the lower wall of the body (1) and the solid core (2).

8. The busbar of claim 7, wherein, The rectangular tubular busbar (B) has transverse air inlets and outlets (3) that allow air circulation from the inside of the tubular busbar (B), wherein the transverse air inlets and outlets (3) are interconnected by internal air duct passages (4) that pass through the solid core (2), are located inside the body (1), pass through the solid core (2) and are transverse with respect to the front and rear walls of the body (1).

9. The busbar according to claims 7 and 8, characterized in that The solid core (2) is located in the central region of the rectangular tubular busbar (B) and extends along the entire length of the central region, which is composed of the overlap of three sections of the same width as the walls of the body (1), occupying the entire internal space of the rectangular tubular busbar (B) between the upper and lower walls of the body (1).

10. The busbar of any one of claims 7 to 9, wherein, The rectangular tubular busbar (B) has a series of mounting holes (5) in the region of the solid core (2), wherein the mounting holes (5) are through holes that pass through the upper and lower walls of the body (1) and the solid core (2); the mounting holes (5) are arranged symmetrically and equidistantly along a straight line on the rectangular tubular busbar (B).

11. The busbar of claim 7, wherein, The hollow areas (A1 and A2) are only connected by the internal air duct passages (4) that pass through the core (2).

12. Rectangular tubular busbar according to any one of claims 7 to 11, in a constructive variant, rectangular tubular conductor busbar, characterized in that, Said rectangular tubular conductor busbar is a rectangular tubular busbar (B') wherein the difference of the construction variant mainly consists in the replacement of the transversal air inlet and outlet holes (3) and the internal air duct passage (4) through the solid core (2) by internal air duct openings (7); said internal air duct openings (7) are arranged perpendicularly with respect to the upper and lower walls of the main body (1) and along three lines, one in the hollow area (Al) and two in the hollow area (A2); the first line in the hollow area (A2) is located between the front wall and the two recessed areas (la and lb) and the second line in the hollow area (A2) is located between the solid core (2) and the recesses (la and lb).

13. The busbar of claim 12, wherein, Said internal air duct openings (7) are equally spaced along each of the three lines and each of them has a substantially rectangular shape and at the same time penetrates both the front and rear walls, thus forming air ducts for cooling the rectangular tubular busbar (B').

14. Rectangular tubular busbar according to any one of claims 12 and 13, in a constructive variant, rectangular tubular conductor busbar, characterized in that, Said rectangular tubular conductor busbar is a construction variant indicated as (B") which has the same construction as the first construction variant (B') but is provided with two rows of mounting holes (5) on the area of the solid core (2).

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