Coil assembly for electrical energy supply networks

Abstract

The invention relates to a coil assembly (1) for electrical energy supply networks. Said coil assembly (1) comprises a hollow-cylindrical air-core choke coil (2) having a vertically extending coil axis (3), and also comprises a support structure (7) having an annular support body (10), which annular support body (10) defines an upper supporting plane, and which annular support body (10) is located below a lower axial end (14) of the air-core choke coil (2) and is designed to support the air-core choke coil (2) in a load-bearing manner. The support structure (7) also comprises a plurality of column-like insulators (11) which are designed to support the annular support body (10) and the air-core choke coil (2) in an electrically insulating and load-bearing manner with respect to a ground foundation or with respect to a ground level (8). The annular support body (10) comprises concrete (18), which concrete (18) is used as the material for providing the load-bearing, strength-relevant annular shape of the support body (10), wherein the concrete (18) contains a non-ferromagnetic reinforcement (19). Said non-ferromagnetic reinforcement (19) comprises fibres, rods (20) and / or mats (21) made of at least one non-ferromagnetic material embedded in the concrete (18).

Description

[0001] COIL UNIT FOR ELECTRICAL POWER SUPPLY NETWORKS

[0002] The invention relates to a coil assembly for electrical power supply networks, as specified in the claims.

[0003] EP3357076B 1 describes a frame for mounting a coil of an air-core reactor. The frame comprises a plurality of arms extending radially from a central hub, each arm having a free end. The frame further comprises a plurality of outer elements, each outer element being coupled to a corresponding pair of adjacent arms in the plurality of arms. The plurality of outer elements is formed from a non-conductive material, and the plurality of arms are formed from a material with sufficient mechanical and structural strength to support the weight of the coil. The corresponding outer element of the plurality of outer elements is coupled to the respective free ends of each pair of adjacent arms in the plurality of arms at a point offset from the free ends of each pair of adjacent arms in the plurality.Depending on the static requirements, this frame between the electrical coil and the column-like insulators must be constructed as a complex truss structure with a variety of metallic and dielectric profiles.

[0004] US2228093A describes an electrical coil in which the electrical conductor for the coil winding is arranged and guided by several stacked insulating clamps. For this purpose, groove-shaped recesses are provided in the stacked insulating clamps to receive the electrical conductor. The insulating clamps space the conductor sections apart, thus preventing short circuits between the windings. At each axial end of the electrical coil, a disc-shaped pressure plate made of reinforced concrete is formed, with the two pressure plates clamped together by means of clamping screws, so that the stack of insulating clamps is resistant to displacement in both axial and radial directions. This coil is supported above ground level by a number of electrical insulators. This design is also unsatisfactory in terms of its construction.

[0005] Furthermore, coil assemblies have been proposed in US2959754A, US2892168A, and GB262261A in which concrete is used to spatially organize and hold in position the electrical conductor to form the electrical winding.

[0006] These structures are also only partially satisfactory.

[0007] The object of the present invention was to overcome the disadvantages of the prior art and to create a coil design for integration into public or industrial power supply networks, which offers a high degree of economic efficiency and still ensures a high functional availability or security of supply.

[0008] This task is solved by a coil assembly unit according to the claims.

[0009] The coil assembly according to the invention for electrical power supply networks comprises a hollow cylindrical air-core choke coil with a vertically extending coil axis. Accordingly, the air-core choke coil has an inner, essentially cylindrical air core. The coil assembly further comprises a support structure with an annular support body, which defines an upper support plane and which is arranged below a lower axial end of the air-core choke coil and is designed for load-bearing support of the air-core choke coil. The support structure further comprises a plurality of column-like insulators, in particular at least three column-like insulators, which are designed for electrically insulating and load-bearing support of the annular support body and the air-core choke coil against a ground foundation or a ground surface.

[0010] The annular support structure for the separately manufactured air choke coil 1 comprises concrete. In particular, the annular support structure can be predominantly made of concrete, especially if it consists of more than 70% by volume of concrete. Preferably, the proportion of concrete in the annular support structure is between 80% and 99.9% by volume of the total volume of the annular support structure. The concrete for the annular support structure can consist at least predominantly of mineral materials, in particular comprising an aggregate of various grain sizes and cement as a binder. The annular support structure is manufactured using flowable concrete, which is cast in a mold and subsequently hardened. The concrete of the annular support structure, especially in its hardened state, serves as the material for providing or creating the load-bearing or load-absorbing annular shape of the support structure.In particular, the concrete forms the outer outline or basic shape of the ring-shaped supporting structure and makes a significant contribution to the static load-bearing capacity or mechanical strength of the ring-shaped supporting structure.

[0011] The concrete of the annular support structure contains non-ferromagnetic reinforcement, comprising fibers and / or rods and / or mats made of at least one non-ferromagnetic material embedded in the concrete. This non-ferromagnetic reinforcement is designed to increase the tensile strength of the concrete and / or to significantly increase the load-bearing capacity of the annular support structure in relation to mechanical tensile stresses exerted on the annular support structure by the mass of the air choke coil and by external forces applied to the structure.

[0012] This allows the ring-shaped support structure, which is predominantly made of concrete, to be supported at specific points on a plurality of ring-shaped, column-like insulators relative to ground level. At least one high-mass air-core choke coil can be attached to the top of the ring-shaped support structure and preferably also supported at at least three to approximately twelve points on the top of the ring-shaped support structure. The vertical compressive strength of the ring-shaped support structure is largely ensured by the inherently high compressive strength of concrete.

[0013] The non-ferromagnetic reinforcement significantly strengthens the concrete ring, especially in relation to achievable or occurring tensile loads during assembly and subsequent operation of the coil assembly. Nevertheless, during electrical operation, the coil assembly's electrical losses are kept as low as possible because induced currents or eddy currents in the vicinity of the air core choke coil, caused by the magnetic field of the air core choke coil, are avoided or minimized. In particular, the low electrical conductivity of the concrete of the annular support structure and the non-ferromagnetic reinforcement embedded within it, at least predominantly or completely, promote low electrical power loss and high mechanical stability of the specified coil assembly. Specifically, the annular support structure can be...whose concrete body is designed to be self-contained, i.e., endless, which can provide significant advantages in terms of the bending or torsional stiffness of the supporting body for the air core choke coil, without causing increased electrical losses due to inductive coupling with the air core choke coil.

[0014] The electrical winding of the hollow cylindrical air-core choke coil is structurally and mechanically self-stabilizing. In particular, it comprises at least one hollow cylindrical winding layer, which consists of turns of at least one electrical conductor held in position by synthetic resin and fabric tape reinforcement. Accordingly, the air-core choke coil is a prefabricated unit that can be supported and mounted on the supporting structure, especially on its annular concrete base. This also contributes to a high degree of cost-effectiveness combined with high functional reliability of the coil assembly.

[0015] The non-ferromagnetic reinforcement material in the annular support structure can be a plastic material, a glass fiber material, a carbon material, or a textile material. These materials can be in the form of loose or interlinked fibers and added to the fresh concrete mix as an aggregate for the production of the annular support structure. In particular, the concrete can be fiber-reinforced concrete (fiber-reinforced concrete), with the non-ferromagnetic reinforcement consisting preferably of homogeneously distributed, non-ferromagnetic fibers within the concrete of the annular support structure. This enables the efficient production of annular support structures with different geometries and / or dimensions, especially through concrete casting.

[0016] Alternatively or in combination with the measures described above, the non-ferromagnetic material can be made of stainless steel. This allows for the creation of high-strength, ring-shaped load-bearing structures that can be reliably dimensioned based on years of experience and / or detailed investigations and standards. In particular, this approach ensures consistently achievable properties and long-term stability of the ring-shaped load-bearing structure. The non-ferromagnetic reinforcement material can be in the form of bars and / or mats. This makes it possible to construct a long-term stable and functional ring-shaped concrete structure with internal reinforcement. In particular, this approach allows for the advantageous use of extensive experience in general reinforced concrete construction.This allows it to build upon existing testing methods or standards relating to general concrete structures and concrete reinforcements.

[0017] The rods and / or mats made of non-ferromagnetic material, in particular plastic, glass or carbon fiber, textile, stainless steel and / or non-ferrous steel, can be formed and / or assembled into so-called reinforcement cages and be cast or integrated, at least predominantly, into the concrete of the annular support structure. This ensures that the reinforcement is formed or remains positioned in the outer edge zones with respect to the cross-section of the annular support structure, thus contributing significantly to the high tensile strength, bending strength, and breaking strength of the annular support structure.

[0018] In an advantageous embodiment, the bars and / or mats can have a surface profile or surface structure, for example ribs, which surface profile is designed to create a positive-locking connection with the concrete enclosing the bars and / or mats. This allows interlocking between the reinforcement and the concrete to be achieved, thus improving the bond between the reinforcement and the concrete and ensuring good force transmission.

[0019] Alternatively or in combination with the aforementioned reinforcement cages, fiber mats made of glass fibers, carbon fibers, and / or textile fibers can be used as reinforcement in the concrete of the ring-shaped support structure. These fiber mats preferably have a grid-like structure. Such mat-reinforced concrete, for example, in the form of textile-reinforced concrete, allows for the creation of ring-shaped concrete structures with a relatively small cross-section while maintaining high load-bearing capacity and stability. Due to the low density of such fiber mats compared to non-ferromagnetic steel or stainless steel, relatively lightweight yet robust ring-shaped support structures can be created. This offers advantages in terms of reduced material usage, economical transport, and the simplest possible lifting and assembly of the ring-shaped support structure.

[0020] Furthermore, it can be advantageous for the rods and / or mats to run along the circumference of the annular support structure without forming a closed electrical loop. This significantly improves the mechanical stability of the annular support structure. At the same time, this allows the electrical losses of the coil assembly to be kept to a minimum. In particular, it can considerably reduce electrical currents that would be caused by electromagnetic induction in the rods and / or mats of the concrete reinforcement due to the alternating magnetic field of the air-core choke coil. Such induced currents would manifest as detrimental heat loss from the annular concrete support structure.Significant heat loss would further reduce the mechanical strength of the reinforcement and, due to differing coefficients of material expansion, lead to mechanical stresses in the annular support structure, potentially impairing long-term stability. These adverse effects can be significantly mitigated by the sophisticated measures implemented.

[0021] Furthermore, the ring-shaped support structure can be designed as a single piece, particularly made of cast concrete. This allows for small cross-sectional dimensions while still achieving high torsional stiffness. Additionally, this eliminates or minimizes seams and joints, thus reducing manufacturing costs.

[0022] Furthermore, the annular support body can be designed to be closed in itself with respect to its circumference and to have a central annular space. This allows for high mechanical stability, in particular high torsional stiffness of the annular support body. Moreover, despite the closed annular shape of the support body, there are no disadvantages regarding inductive coupling and the associated electrical energy losses. In addition, the central annular space ensures good cooling of the air-cooled choke coil by rising convection air.

[0023] At least on some of the circumferential edges of the annular support body, chamfers or so-called chamfered edges can be formed. This helps prevent chipping or edge breakage on the annular support body. In particular, this can improve the handling and robustness of the annular support body. A further advantage is a design in which the annular support body has at least one internal cavity, especially at least one cavity extending around the circumference of the ring. This allows for a significant weight reduction with only minor or negligible losses in the mechanical stability of the annular support body. Moreover, this results in cost advantages because column-like insulators with relatively low load-bearing capacity can be used.Furthermore, this allows for increased stability and earthquake resistance of the coil assembly with minimal technical effort to save weight.

[0024] The at least one internal cavity can be channel-like, for example, in a ring shape. Alternatively, several interconnected or separate hollow chambers can be formed. These can be created, for example, by so-called "concrete balloons," specifically defined by air- or gas-filled bellows or shells cast into the concrete. Alternatively or in combination, to reduce the weight of the ring-shaped concrete body, at least one body made of a lightweight material, such as foam plastic, can be provided, at least partially cast into the concrete.

[0025] According to an advantageous embodiment, the upper support plane of the annular support body can be flat or planar, and / or the annular support body can have a flat or planar lower support plane. Accordingly, the annular support body does not have a circular or elliptical cross-section. This facilitates load-bearing support of the air-core choke coil at at least three to approximately twelve points on the upper surface of the annular support body and / or the support of the annular support body against the column-like insulators.

[0026] Furthermore, it can be advantageous if the annular support body is tapered or narrowed in sections along its circumference with respect to its cross-section. Accordingly, the support body can have reduced cross-sectional dimensions in certain sections. This allows for a weight reduction of the annular support body without significantly affecting its torsional stiffness. This weight reduction, however, is accompanied by advantages with regard to the column-like insulators. In particular, it can be provided that the annular support body has a first cross-sectional height and at least a second cross-sectional height along its circumference, and preferably the upper support plane for the air-core choke coil is continuously variable or flat. This allows for an increased vertical distance between the air-core choke coil and metallic parts of the support structure, such as mounting brackets or...This is achieved through the use of metallic head fittings for the column-like insulators, without significantly increasing the weight of the ring-shaped concrete support structure. In particular, this allows the electrical power loss of the coil assembly in conjunction with inductive couplings to be kept low in an efficient and weight-optimized manner.

[0027] Furthermore, the annular support body can be provided with a first cross-sectional width and at least a second cross-sectional width along its circumference, and preferably the upper support plane for the air-core choke coil is continuously variable or flat. This allows for a substantially gear-shaped or star-shaped circumferential contour of the annular support body. This enables a good balance between low weight and high load-bearing capacity or torsional stiffness of the annular support body. It also allows for good cooling or a chimney effect with respect to the lower axial end or with respect to any hollow cylindrical cooling channels between concentrically arranged winding layers of the air-core choke coil. Furthermore, this provides a relatively wide and therefore stable support for the annular support body against a base surface.In particular, this allows for a simple yet effective increase in roll stability with low component mass.

[0028] In one embodiment, the upper ends or head fittings of the column-like insulators can be connected, particularly by bolting, to a lower support level of the annular support body. This allows the annular support body to rest stably on the upper ends or head fittings of the column-like insulators. Shear forces between the annular support body and the head fittings are mitigated by the connection interface on the underside of the annular support body. Since the annular support body mechanically connects the column-like insulators at their upper end sections, a high degree of mechanical stability can be achieved for this support structure.Another advantageous embodiment involves the integration of several spaced support feet, particularly in the form of support brackets, at the lower axial end of the air-core choke coil with the preferably flat upper support surface of the annular support body, preferably by bolting. The support feet can have a vertical height or support height between 30 mm and 200 mm. The number of these support feet can range from three to twelve, and in some cases even higher. This allows for passive air cooling of the air-core choke coil based on natural convection. Furthermore, it creates a tolerance-compensating yet stable connection between the air-core choke coil and the annular concrete support body.These sophisticated measures are particularly effective when the air-core choke coil comprises at least two hollow cylindrical, concentrically positioned winding layers with at least one vertically extending air gap formed between them.

[0029] According to a further development, it is possible for the preferably metallic support feet between the air-core choke coil and the annular support body to be designed with a more elastically compliant or lower vertical stiffness compared to the vertical elasticity or stiffness of the annular support body. This allows for advantageous compensation of dimensional tolerances with respect to the annular concrete support body and / or with respect to the air-core choke coil. Adverse mechanical stresses between the aforementioned components can thus be prevented. Alternatively or in combination, vibration decoupling between the air-core choke coil and the annular concrete support body can be achieved. Vibrations occurring during the operation of the air-core choke coil, or...Vibrations caused by electromagnetic forces can be dampened and / or frequency-filtered before being transmitted to the concrete of the annular support structure. Depending on the amplitude-damping and / or frequency-filtering effect of the support feet, the fatigue strength and / or service life of the concrete body of the annular support structure, as well as of the air-cooled choke coil, can be improved. For example, the support feet can incorporate damping and / or spring elements that act at least vertically, such as multiple disc springs.

[0030] Furthermore, it can be advantageous if the support feet are connected to the annular support body in a pull-out-resistant manner by means of concrete anchoring elements, which are anchored or can be anchored in the concrete of the annular support body, at positions along the circumference of the annular support body that are not predetermined, particularly at circumferential and / or radial positions that can be selected relatively freely by an installer. This also allows for advantageous compensation of dimensional tolerances between the Luftkem choke coil and the concrete body of the annular support body. In particular, the annular support body made of concrete and / or the at least one electrical winding layer of the Luftkem choke coil can advantageously be manufactured with higher dimensional tolerances. The measures described in the claim provide a more flexible mounting option in terms of position, and no fixed, predefined mounting points on the top of the annular support body are required.This eliminates the need for a relatively complex, dimensionally accurate integration of metallic anchoring elements, such as retaining plates, into the concrete of the ring-shaped supporting structure.

[0031] The concrete anchoring elements can be formed, for example, by concrete anchor bolts or concrete tension anchors screwed, drilled, and / or bonded into the concrete of the supporting structure. Such connecting elements allow for a quickly constructed yet high-strength connection of the support feet to the concrete body of the ring-shaped supporting structure.

[0032] According to an advantageous embodiment, metallic coupling brackets can be formed between the upper ends of the column-like insulators and the annular support structure. These coupling brackets are designed for a mechanical, load-bearing connection between the upper ends of the column-like insulators and, preferably, the lower support plane of the annular support structure. This makes it possible to create stable and mechanically optimal transition interfaces between the annular concrete support structure and the column-like insulators. In particular, the concrete body of the annular support structure can be kept geometrically simple, and any inclination or support angles of the column-like insulators deviating from the vertical can be robustly and practically accommodated by the metallic coupling brackets.In particular, this makes it possible to provide a flat, horizontally oriented lower support plane when the ring-shaped support body is in operation.

[0033] Furthermore, the annular support body may include an electrically conductive polarity conductor, which is at least partially or completely embedded in the concrete of the annular support body. The polarity conductor can be in the form of a strip or wire. Preferably, the polarity conductor is integrated or embedded in the concrete of the annular support body with a predominant portion of its surface area. This allows for a high degree of prefabrication of the coil assembly and also facilitates simple and reliable assembly of the support structure for the air-core choke coil. The polarity conductor, embedded at least partially or completely in the concrete, is thus well protected against mechanical damage and also against unwanted corrosion, which is particularly advantageous in environments with high humidity and / or in areas with high salt content in the ambient air, for example, near the sea.

[0034] The individual metallic coupling brackets can be connected in series by means of the electrically conductive polarity conductor. However, the polarity conductor does not form a closed ring structure, but only runs over a section of the ring circumference of the annular concrete support structure. This minimizes electrical losses due to inductive coupling with the air core choke coil. Furthermore, the polarity conductor can be provided for connection to an electrical terminal of the air core choke coil, so that the polarity conductor and the metallic coupling brackets are at a defined electrical potential.

[0035] In an advantageous embodiment, the annular support body can have a polygonal shape with respect to its circumference, in particular a shape that is at least square to sixty-four-sided. This allows for a ring-shaped concrete support body that is sufficiently round to fit the cylindrical surface of the air-core choke coil well, especially to prevent protrusions of the outer corners of the polygonal support body. Furthermore, this achieves a good compromise between roundness and the effort required for forming or molding the concrete body. In addition, this minimizes the manufacturing costs of the annular concrete support body. In a practical embodiment, the annular support body can have a hexagonal outer and / or inner contour.

[0036] Furthermore, the annular support body can be designed in multiple parts, with the at least one joining plane between the joinable support body parts running radially and preferably parallel to an annular axis of the support body. In particular, the annular support body made of concrete can be composed of two or more ring segments. This allows for simpler and more cost-effective transport. Specifically, lighter individual parts or parts with smaller dimensions can be produced. The corresponding individual parts can then be assembled relatively easily at the installation or operating location of the coil assembly unit to form the annular support body. The at least one radially and vertically extending separation or joining plane between the at least two ring segments or...Individual components of the ring-shaped support structure allow for the provision of ring-shaped support structures made of concrete with an outer diameter of more than 2.5 meters, in particular between 2.5 meters and 4 meters, without incurring major expenses for transport or logistics.

[0037] Furthermore, the annular support body can be designed with several cooling air channels or openings distributed around its circumference, extending between its underside and top surface, for the passage of cooling or convection air. This ensures effective cooling of the electrical winding of the air-core choke coil, even with a relatively small vertical distance between the lower axial end of the winding or the hollow cylindrical part of the winding and the top surface of the annular support body. In particular, this allows for relatively low support feet or winding stars to be formed between the underside of the electrical winding and the annular concrete support body, resulting in a lower center of gravity for the coil assembly.The small vertical distance between the electrical winding of the air core choke coil and the ring-shaped support body comprising concrete and its non-ferromagnetic reinforcement also prevents inductive coupling or electrical energy losses of the coil assembly.

[0038] According to a practical embodiment, the annular concrete support structure can have an axial height, measured between its upper and lower concrete support levels, of between 20 cm and 100 cm, preferably between 30 cm and 70 cm. This minimizes electrical losses and heat generation in the metallic coupling brackets located between the insulators and the underside of the concrete ring or support structure, as well as in the metallic head fittings of the insulators. In particular, this allows for greater vertical distances to the air-core choke coil.

[0039] If the axial height of the concrete ring of the annular support structure reaches or exceeds a predetermined value, recesses or cutouts in the concrete body are advantageous to reduce weight. For example, several distributed support extensions made of concrete can be provided on the underside of the annular concrete body, extending downwards, which support extensions are intended for load-bearing support on the top of the column-like insulators.

[0040] To better understand the invention, it is explained in more detail with reference to the following figures.

[0041] They each show, in a highly simplified, exemplary representation:

[0042] Fig. 1 shows a coil assembly comprising an air core choke coil and a supporting structure for it in a perspective view from a slant below;

[0043] Fig. 2 shows the coil assembly unit according to Fig. 1 in a perspective view from an oblique angle above;

[0044] Fig. 3 shows reinforcement for the concrete of the ring-shaped supporting body in the supporting structure according to Figures 1 and 2;

[0045] Fig. 4 shows an embodiment of a ring-shaped support structure built with concrete;

[0046] Fig. 5 shows a detailed view of the coil assembly according to Figures 1 and 2 in the area of ​​the ring-shaped, concrete-built support body;

[0047] Fig. 6 shows another embodiment of a ring-shaped support structure built with concrete;

[0048] Fig. 7 shows another embodiment of a ring-shaped support structure built with concrete;

[0049] Fig. 8 shows a polygonal embodiment of a ring-shaped support structure constructed of concrete. It should be noted by way of introduction that in the differently described embodiments, identical parts are provided with the same reference numerals or component designations, whereby the disclosures contained in the entire description can be applied analogously to identical parts with the same reference numerals or component designations. Furthermore, the positional designations chosen in the description, such as top, bottom, side, etc., refer to the figure directly described and illustrated, and these positional designations must be applied analogously to the new position if the orientation changes.

[0050] Figures 1 and 2 illustrate an embodiment of a coil assembly 1 for electrical power supply networks. An electrical power supply network includes publicly accessible supply networks as well as supply networks for industrial plants.

[0051] The coil assembly 1 comprises a substantially hollow cylindrical air-cooled choke coil 2. As is known per se, this air-cooled choke coil 2 can comprise a plurality of concentrically arranged, electrically parallel-connected winding layers – indicated in Fig. 7. Preferably, defined radial distances are provided between the outer and inner surfaces of immediately adjacent winding layers to form vertical, substantially hollow cylindrical cooling air channels, as can also be seen in Fig. 7. In the axial direction to these substantially hollow cylindrical cooling air channels, so-called spacer or gap strips can extend, which, among other things, contribute to a mechanically stable connection between the concentrically arranged winding layers. The air-cooled choke coil 2 defines a coil axis 3, which runs vertically in the operating state according to Figs. 1 and 2. In particular, the main orThe coil axis 3 of the essentially hollow cylindrical air-cooled choke coil 2 runs in a vertical direction when the coil assembly 1 is in an operational assembly state, as illustrated in Figs. 1 and 2.

[0052] The diameter 4 of a central air core 5 of the air core choke coil 2 can be between 60% and 99%, in particular between 70% and 95%, of an outer diameter 6 of the air core choke coil 2.

[0053] The coil assembly 1 further comprises a support structure 7 for the load-bearing support of the air-core choke coil 2 above a ground level 8, which can be defined, for example, by a base plate or by at least one foundation embedded in the ground. The support height 9 of the support structure 7, essentially a vertical distance of the air-core choke coil 2 from the ground level 8, can typically be between 100 cm and 1100 cm. This support height 9 depends primarily on the voltage potential (high voltage or extra-high voltage) applied to the air-core choke coil 2.

[0054] The mechanically and insulation-relevant supporting structure 7 comprises an annular support body 10. Preferably, this annular support body 10 is designed as a closed ring. The outer and / or inner circumferential contour of the annular support body 10 can be circular or polygonal. The free center or core area of ​​the annular support body 10, hereinafter also referred to as the central annular space 25, can likewise be bounded either circularly or polygonally with respect to its circumferential direction. The central area of ​​the annular support body 10 thus represents a free space oralso represents an air core, which, with regard to its clear inner diameter, can be at least approximately similar to the inner diameter 4 of the air core choke coil 2, i.e., can be similarly dimensioned, in particular in the range between - 20% and +20% of the inner diameter 4 of the air core choke coil 2.

[0055] The supporting structure 7 further comprises a plurality of electrical insulators 11, which are designed and arranged in a column-like manner. These column-like insulators 11 are distributed along the ring circumference 31 of the supporting body 10 and thus define a support structure with at least three legs for the annular supporting body 10 and for the at least one air-core choke coil 2 supported thereon, relative to the ground level 8. These column-like insulators 11 define individual support points 38 at their upper ends for the annular supporting body 10. The column-like insulators 11 can be vertical and / or inclined with respect to the ground level 8. According to an embodiment not shown, several air-core choke coils 2 arranged one above the other in the axial direction, i.e., along the coil axis 3, can be provided.

[0056] The electrically insulating sections of the individual column-like insulators 11 can each comprise at least one support leg 12 at their end sections closest to ground level 8, which is preferably made of metal. The upper ends 38 of the electrically insulating insulators 11 can each comprise a support bracket 13, hereinafter also referred to as coupling brackets 39, which are provided for the mechanical coupling of the electrically insulating insulators 11 with the annular support body 10. These support brackets 13 can also be made of metal, in particular designed as a metal structure, and represent a metallic coupling interface between the annular support body 10 made of concrete 18 and the column-like insulators 11.

[0057] The annular support body 10 is arranged below a lower axial end 14 of the air core choke coil 2 and is provided for load-bearing support or for receiving the mass of the air core choke coil 2.

[0058] The air core choke coil 2 can – as is known per se – have a lower winding star 15, which is located closest to the lower axial end 14, and an upper winding star 16, which is located closest to an upper axial end 17 of the air core choke coil 2. The lower winding star 15 and / or the upper winding star 16 are generally defined by metallic profiles or flat profiles that are firmly connected to the winding of the air core choke coil 2. Typically, the lower and upper windings s star 15, 16 each define the electrical connections of the air core choke coil 2. The windings s star 15, 16 can also serve for the electrical parallel connection of the aforementioned electrical winding positions (Fig. 7), which winding positions are usually arranged coaxially to each other and define the inductance and the current carrying capacity of the air core choke coil 2.

[0059] The annular support structure 10 comprises hardened concrete 18 as its shaping material or base material. In particular, the annular support structure 10 is predominantly formed by the mineral material concrete 18. Typically, the concrete content of the annular support structure 10 can exceed 70%, and in particular can be between 80% and 99.9%, of the solid volume of the annular support structure 10. The preferably cast concrete 18 serves as the material for providing the load-bearing, strength-relevant ring shape of the support structure 10. In particular, the concrete 18 used significantly contributes to the external dimensions and mechanical properties, especially the strength and load-bearing capacity, of the annular support structure 10. Regarding the mechanical properties, especially the strength and load-bearing capacity, the following are important considerations:The load-bearing capacity of the annular support structure 10 is also enhanced by reinforcement 19, which is at least predominantly integrated into the concrete 18 and is thus indicated by dashed lines in Figures 1 and 2. In particular, the concrete 18 or the annular support structure 10 contains at least one non-ferromagnetic reinforcement 19, i.e., reinforcement 19 that causes no or no significant electrical losses due to induced eddy currents. This non-ferromagnetic reinforcement 19 can comprise fibers made of at least one non-ferromagnetic material embedded or mixed into the concrete 18, and / or bars 20 and / or mats 21 made of at least one non-ferromagnetic material, as is schematically indicated by dashed lines in Figures 1 and 2.

[0060] The at least one non-ferromagnetic material of the concrete reinforcement 19 can be a plastic material, a glass fiber material, a carbon material, and / or a textile material. Reinforcement 19 made of such a non-ferromagnetic material induces no or negligible electrical currents within the concrete 18 of the annular support structure 10. This prevents or minimizes thermal losses or heating of the concrete 18 of the annular support structure 10 due to the electromagnetic fields of the air-core choke coil 2 during its operation.

[0061] Alternatively or in combination, at least one non-ferromagnetic material for the concrete reinforcement 19 can be formed by non-ferromagnetic steel or stainless steel. This also results in induced eddy currents in the concrete reinforcement 19 of the annular support body 10 being low or negligible, so that no significant heating of the reinforcement 19 or of the annular support body 10 occurs during operation of the air-core choke coil 2.

[0062] As illustrated by way of example in Fig. 3, the non-ferromagnetic material of the reinforcement 19 can be in the form of bars 20 and / or mats 21. In particular, mats 21 can also be formed by a plurality of crossed bars 20, for example made of stainless steel, which can be flat or three-dimensional. According to the embodiment in Fig. 3, the reinforcement 19 for the annular support body 10 (Figs. 1, 2) can be designed as a cage-like ring. The respective reinforcement 19 is embedded in the concrete 18, in particular at least predominantly or completely encased by the concrete 18. If the reinforcement 19 is formed by non-ferromagnetic bars 20 or mats 21, these can have a surface profile 22, such as transverse ribs known per se, as has been indicated by way of example and partially in Fig. 3.Alternatively or in combination, reinforcement 19 for the mineral-composed concrete 18 can also be achieved by fibers made of non-ferromagnetic materials mixed into the concrete 18, in particular by so-called fiber-reinforced concrete.

[0063] As illustrated by way of example in Fig. 3, it is advantageous if the bars 20 and / or mats 21 extend along the circumference of the annular support body 10, but do not form a closed electrical loop. In particular, overlapping sections 23 of the ends of an annular bar 20 are electrically insulated from one another. Preferably, the end sections of an annularly bent bar 20 do not contact each other directly, but are coupled to each other only via the electrically poorly conductive or dielectric concrete 18. The same applies to reinforcement ring elements 24, which can be arranged transversely or radially to the circumference of the reinforcement 19 or the support body 10.

[0064] However, it may be advantageous if the body of the ring-shaped support structure 10, formed from concrete 18, is closed or endless with respect to its ring circumference 31 in order to achieve high mechanical strength values ​​and stability properties, in particular to achieve high torsional stiffness, as illustrated in Figs. 1 and 2.

[0065] The annular support body 10 defines an axially free, central annular space 25 (Figs. 1, 4), which can be used to support a cooling effect for the air-cooled choke coil 2 by ambient air or by air convection, in particular by a so-called chimney effect. Furthermore, this central annular space 25 makes it possible to reduce or minimize the mass of the annular support body 10 made of concrete 18.

[0066] According to the embodiment shown in Figures 1 to 3, the concrete body of the annular support structure 10 can be formed in one piece, particularly by means of cast concrete 18, which allows the annular support structure 10 to offer high mechanical stability and strength. According to the embodiment shown in Figure 4, the annular support structure 10 can also be formed in multiple parts, in particular by means of a first support structure part 26 and at least one further support structure part 27. The at least one joining plane 28 between the joinable support structure parts 26, 27 can extend radially and preferably parallel to an annular axis 29 of the annular support structure 10. The individual support structure parts 26, 27 are preferably connectable to form a one-piece, but multi-part, annular support structure 10 by means of mechanical or positive-locking coupling elements, for example, screws.The supporting body parts 26, 27 can be formed by ring segments, for example defined by joinable half-rings.

[0067] Independently of or in combination with this, it can be provided that the annular support body 10, or at least one of its support body parts 26, 27, has at least one internal cavity 30, in particular at least one cavity 30 extending over the ring circumference 31 or cavities 30 extending over sections of the ring circumference 31. The at least one cavity 30 is preferably free of concrete 18 and may contain air. However, it is also possible that the at least one concrete cavity 30 is at least partially or completely filled by a low-mass material, for example, foamed plastic or foam plastic, which material could be provided as a mold core during the manufacture or casting of the annular support body 10.Concrete balls or gas-filled tubes can also be used as core materials, forming at least one cavity 30 in the molded, annular support body 10. The mass and mechanical stability of the annular support body 10 can be optimized, especially if the at least one cavity 30 is located near the neutral axis of the annular support body 10.

[0068] As further schematically indicated in Fig. 4, an upper support plane 32 of the annular support body 10 can be designed as a flat surface. Alternatively or in combination with this, the annular support body can have a lower support plane 33 that is also designed as a flat surface. The upper support plane 32 is provided for receiving the mass or for introducing the load of the air-core choke coil 2 into the annular support body 10. The lower support plane 33 can be provided for transferring the mass or load of the toroidal choke coil 2 and the annular support body 10 to the column-like insulators 11 (Figs. 1 and 2). The annular support body 10 can have a chamfer 34 on at least one of its boundary edges, which run along the ring circumference 31. This at least one chamfer 34, orThe chamfer is dimensioned such that unwanted chipping of concrete 18 from the annular support body 10 is prevented during the assembly of the coil assembly unit 1 or during the assembly or transport of the annular support body 10. The annular support body 10 can have a substantially square or rectangular cross-section, preferably with a chamfer 34 formed along each of the four boundary edges, as illustrated by way of example in Fig. 4.

[0069] In Fig. 5, the ring-shaped support body 10 comprising concrete 18 is illustrated by way of example in its function as a mechanical interface element, which is arranged in the vertical direction between the air core choke coil 2 and the column-like insulators 11.

[0070] The air-core choke coil 2 can be connected to the upper support plane 32 of the annular support body 10 via several support feet 35 spaced apart from one another along the ring circumference 31, in particular by screws. The support feet 35 are preferably positioned between the lower axial end 14 of the air-core choke coil 2, in particular its lower winding star 15, and the upper support plane 32 of the annular support body 10.

[0071] The support feet 35 can be designed to be more elastically compliant in the vertical direction, or to have lower vertical stiffness, compared to the vertical elasticity or stiffness of the annular support body 10. The vertical elasticity of the support feet 35 can be achieved by implementing metallic spring arms 36 and / or disc springs. It may also be advantageous if the support feet 35 provide a predetermined elasticity acting in the horizontal direction between the air-core choke coil 2 and the annular support body 10.

[0072] It can be advantageous if the support feet 35 are firmly connected to the annular support body 10 by means of several concrete anchoring elements 37 (indicated by dashed lines), in particular by means of so-called concrete anchoring screws, which are anchored or can be anchored in the concrete 18 of the annular support body 10, at positions that are not predetermined, in particular at arbitrary positions along the circumference 31 of the annular support body 10. The concrete anchoring elements 37 can be screwed or drilled and / or glued directly into the concrete 18 of the annular support body 10. This allows for a relatively universal use of the annular support body 10 for various embodiments of air-core choke coils 2. In particular, this allows for a specific pitch dimension or...A number of support feet 35 are attached to the underside of the air-core choke coil 2, independently of fixed, predetermined attachment points on the upper support plane 32 of the annular support body 10. This also allows for improved compensation of dimensional tolerances with respect to the air-core choke coil 2 and / or the annular support body 10. The corresponding concrete anchoring elements 37 can be positioned relatively flexibly by drilling into the concrete 18 of the annular support body 10 at the locations determined by the spacing of the support feet 35 and / or by any positional or dimensional tolerances. This also improves ease of assembly and installation.

[0073] Metallic coupling brackets 39 can be formed between the upper ends 38 of the column-like insulators 11 and the annular support body 10. These coupling brackets 39 are designed for the mechanical, load-bearing connection between the upper ends 38 of the column-like insulators 11, in particular their head fittings, and preferably the lower support level 33 of the annular support body 10. This connection can be made via a plurality of screw- or bolt-like connecting elements 40. Alternatively, it is also conceivable to support or attach the coupling brackets 39 to the outer surface of the annular support body 10, which, however, would result in higher shear stresses between the coupling brackets 39 and the annular support body 10, particularly with regard to screw- or bolt-like connecting elements, for example in the form of concrete anchors.

[0074] As further illustrated in Fig. 5, independently of or in combination with the measures described below, the annular support body 10 can be provided with an electrically conductive polarity conductor 41, for example made of aluminum, copper, iron, or stainless steel. This polarity conductor 41 can be in the form of a strip or cable. It is advantageous if the polarity conductor 41 is at least partially or completely embedded in the concrete 18 of the annular support body 10 and is thereby connected to the annular support body 10 in a tear-resistant manner and well protected against mechanical stress. As further illustrated by way of example in Fig. 5, the individual metallic coupling brackets 39 can be connected in series by means of the electrically conductive polarity conductor 41.In particular, it may be advantageous for the polarity conductor 41 to electrically connect all coupling brackets 39 by electrically coupling the anchoring elements (indicated by dashed lines) cast into the concrete 18, which are intended for mechanical and electrical connection with the coupling brackets 39. The anchoring elements cast into the concrete 18 may have threaded bushings for mechanical and, simultaneously, electrical connection to the metallic coupling brackets 39 and the column-like insulators 11. This connection may be effected via a plurality of screw- or bolt-like connecting elements 40 between the anchoring elements cast into the concrete 18 and the respective coupling brackets 39.In particular, it may be provided that the coupling consoles 39, when in their assembled state, must make electrical contact with the polarity conductor 41.

[0075] The polarity conductor 41 does not form a closed ring structure, but only extends over a section of the ring circumference 31 of the annular support body 10, as can be seen in Fig. 5 by means of an interrupted section 42 of the polarity conductor 41. In order to bring all metallic coupling brackets 39 to a defined electrical voltage potential, it can be provided that the polarity conductor 41 or at least one of the coupling brackets 39 is connected by means of at least one electrical connecting bridge 43, 43 1 with the air-core choke coil 2, for example with its lower winding s star 15, is electrically conductively connected, as shown schematically in the left section of Fig. 5. The at least one electrical connecting bridge 43, 43 1can be designed as a ribbon- or rope-shaped ladder, which can extend predominantly in the axial direction of the ring-shaped support body 10.

[0076] Figures 6 and 7 show further and, where applicable, independent embodiments of the annular support body 10, using the same reference numerals and component designations for identical parts as in the preceding figures. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures. Here, the concrete body 18 of the annular support body 10 is tapered or reduced along its circumference 31 with respect to its cross-section, particularly its cross-sectional area, along mutually spaced sections 44, i.e., it is narrowed section by section and then widened again. This allows the volume of concrete 18 for the annular support body 10 to be reduced without significantly impairing its static or mechanical properties.In particular, this allows for an improved ratio between mass and static parameters of the ring-shaped support body 10.

[0077] Cross-sectionally enlarged sections 45 between the successive, tapered sections 44 along the ring circumference 31 can function as support zones 46 of the annular support body 10 against the column-like insulators 11. By way of example, Figures 6 and 7 each show six cross-sectionally enlarged sections 45, although the number can also be lower or higher, in particular between three and twelve. In the embodiment according to Figure 6, a support zone 46 is formed against a column-like insulator 11 at each of the enlarged sections 45, so that, for example, six column-like insulators 11 are provided. In the embodiment according to Figure 7, however, a support zone 46 is formed against a column-like insulator 11 at every second enlarged section 45, so that, for example, three column-like insulators 11 are provided.

[0078] In the embodiment according to Fig. 6, the annular support body 10 has a first cross-sectional height 47 and at least one second cross-sectional height 48 along its ring circumference 31, wherein the at least one second cross-sectional height 48 is comparatively larger and thus defines an extended section 45. Preferably, the upper support plane 32 for the Euftkem choke coil 2 (Fig. 5) is continuously variable or flat. The support zones 46 opposite the column-like insulators 11 can define the lower support plane 33 of the annular support body 10 or lie parallel to the lower support plane 33.

[0079] According to the embodiment shown in Fig. 7, the annular support body 10 has a first cross-sectional width 49 and at least one second cross-sectional width 50 along its ring circumference 31. These cross-sectional widths 49 and 50 are dimensioned radially to the annular support body 10, with the at least one second cross-sectional width 50 being comparatively larger and thus defining an extended section 45. Preferably, the upper support plane 32 for the Euftkem choke coil 2 (Fig. 5) is continuously variable or flat. Particularly in the embodiment shown in Fig. 7, the Euftkem choke coil 2 can be positioned on the annular support body 10 such that at least some of its electrically parallel winding layers, or the entire electrical winding 51, overlap or intersect the annular support body 10 in a top view (bird's-eye view) such that the widths 49 and 50 are not affected.The radially tapered sections 44 of the annular support body 10 define vertically extending cooling air openings or cooling air channels 52 for the electrical winding 51 of the air core choke coil 2. In particular, this allows the lower axial end of the air core choke coil 2 to be at least partially exposed and facilitates the supply of convective cooling air to the lower axial end 14 or into the electrical winding 51 of the air core choke coil 2.

[0080] In the embodiment shown in Fig. 8, a further and optionally independent configuration of the ring-shaped support body 10 is depicted, whereby the same reference numerals or component designations are used for identical parts as in the preceding figures. To avoid unnecessary repetition, reference is made to the detailed description in the preceding figures.

[0081] The ring-shaped support body 10 has a polygonal shape with respect to its ring circumference 31, which is, for example, hexagonal. In particular, the outer and / or inner outline of the ring-shaped support body 10 can be square to sixty-four-sided, and especially hexagonal to dodecagonal.

[0082] Regardless of the outline shape of the annular support body 10, it can have several cooling air channels 52 extending between its underside and its top side, preferably evenly distributed around the ring circumference 31, which are provided for the passage of cooling air. These cooling air channels in the concrete 18 of the annular support body 10 can run vertically or be inclined relative to the vertical.

[0083] Likewise, regardless of the outline shape of the annular support body 10 made of concrete 18, the axial height 53 between its upper support level 32 made of concrete 18 and its lower support level 33 made of concrete 18 can be between 20 cm and 100 cm, preferably between 30 cm and 70 cm. In the embodiment according to Fig. 6, the axial height 53 of the annular support body 10 would correspond to the second, or larger, cross-sectional height 48 described above. The exemplary embodiments show possible variants, whereby it should be noted here that the invention is not limited to the specifically illustrated variants, but rather various combinations of the individual variants are also possible, and this possibility of variation lies within the capabilities of a person skilled in this technical field due to the teaching of the present invention.

[0084] The scope of protection is defined by the claims. However, the description and drawings must be consulted for the interpretation of the claims. Individual features or combinations of features from the different embodiments shown and described can, in themselves, represent independent inventive solutions. The problem underlying these independent inventive solutions can be found in the description.

[0085] All references to value ranges in this description are to be understood as encompassing any and all sub-ranges thereof, e.g., the reference 1 to 10 is to be understood as including all sub-ranges, starting from the lower limit 1 and the upper limit 10, i.e., all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g., 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10.

[0086] Finally, for the sake of clarity, it should be noted that, for a better understanding of the structure, some elements have been shown not to scale and / or enlarged and / or reduced in size.

[0087] Reference numeral list

[0088] Coil assembly unit 32 upper support level air choke coil 33 lower support level coil shaft 34 chamfer diameter 35 support feet

[0089] Air kem 36 metallic spring arms

[0090] Outer diameter 37 concrete anchoring elements

[0091] Supporting structure 38 upper ends ground level 39 coupling brackets

[0092] Support height 40 Connecting elements ring-shaped support body 41 Polarizing conductor column-like insulators 42 Interruption section Support leg 43,43' Connecting bridge

[0093] Support bracket 44 tapered sections lower axial end 45 widened sections lower winding stem 46 support zones upper winding stem 47 first cross-sectional height upper axial end 48 second cross-sectional height

[0094] Concrete 49 first cross-sectional width

[0095] Reinforcement 50 second cross-sectional width bars 51 electrical winding

[0096] Mats 52 cooling air channels

[0097] Surface profiling 53 axial installation height overlap s cuts reinforcement ring element central annular space first load-bearing body part further load-bearing body part joining plane

[0098] Ring axis inner cavity

[0099] Ring circumference

Claims

1. P a t e n t a n s p r ü c h e 1. Coil assembly (1) for electrical power supply networks, the coil assembly (1) comprising a hollow cylindrical air-core choke coil (2) with a vertically extending coil axis (3), and a support structure (7) with an annular support body (10), which annular support body (10) defines an upper support plane (32), and which annular support body (10) is arranged below a lower axial end (14) of the air-core choke coil (2) and is designed for load-bearing support of the air-core choke coil (2), which support structure (7) further comprises a plurality of column-like insulators (11), which column-like insulators (11) are designed for electrically insulating and load-bearing support of the annular support body (10) and the air-core choke coil (2) against a ground foundation or against a ground level (8), characterized in that the ring-shaped support bodies (10) made of concrete (18),which concrete (18) is used as material for providing the load-bearing, strength-relevant ring shape of the supporting body (10), wherein the concrete (18) contains a non-ferromagnetic reinforcement (19), and wherein this non-ferromagnetic reinforcement (19) comprises fibers and / or rods (20) and / or mats (21) made of at least one non-ferromagnetic material embedded in the concrete (18).

2. Coil assembly unit according to claim 1, characterized in that the at least one non-ferromagnetic material is formed by a plastic material and / or by a glass fiber material and / or by a carbon material and / or by a textile material.

3. Coil assembly according to claim 1 or 2, characterized in that the at least one non-ferromagnetic material is formed by stainless steel or corrosion-resistant steel.

4. Coil assembly unit according to claim 3, characterized in that the stainless steel or stainless steel is formed in the form of rods (20) and / or mats (21).

5. Coil assembly unit according to one of the preceding claims, characterized in that the rods (20) and / or mats (21) have a surface profile (22) which surface profile (22) is designed to create a positive connection with the concrete (18) enclosing the rods (20) and / or mats (21).

6. Coil assembly unit according to one of the preceding claims, characterized in that the rods (20) and / or mats (21) extend along the ring circumference (31) of the annular support body (10), but do not form a closed electrical loop.

7. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) is formed in one piece, in particular from molded concrete (18).

8. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) is enclosed in relation to its ring circumference (31) and has a central annular space (25).

9. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) has at least one inner cavity (30), in particular at least one cavity (30) extending over the ring circumference (31), or cavities (30) extending over sections of the ring circumference (31).

10. Coil assembly unit according to one of the preceding claims, characterized in that the upper support plane (32) of the annular support body (10) is designed as a flat surface and / or that the annular support body (10) has a flat lower support plane (33).

11. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) is tapered along its ring circumference (31) with respect to its cross-section in partial sections (44).

12. Coil assembly unit according to claim 11, characterized in that the annular support body (10) has a first cross-sectional height (47) and at least a second cross-sectional height (48) along its ring circumference (31), and preferably the upper support plane (32) for the air core choke coil (2) is continuously designed.

13. Coil assembly unit according to claim 11 or 12, characterized in that the annular support body (10) has a first cross-sectional width (49) and at least a second cross-sectional width (50) along its ring circumference (31), and preferably the upper support plane (32) for the air-cooled choke coil (2) is continuously designed.

14. Coil assembly unit according to one of the preceding claims, characterized in that upper ends (38) of the column-like insulators (11) are connected, in particular screwed, to a lower support plane (33) of the annular support body (10).

15. Coil assembly unit according to one of the preceding claims, characterized in that several spaced-apart support feet (35) at the lower axial end (14) of the air core choke coil (2) are connected, in particular screwed, to the upper support plane (32) of the annular support body (10).

16. Coil assembly according to claim 15, characterized in that the support feet (35) between the air core choke coil (2) and the annular support body (10) are designed to be more elastically flexible in the vertical direction or with lower vertical stiffness compared to the vertical elasticity or stiffness of the annular support body (10).

17. Coil assembly unit according to claim 15 or 16, characterized in that the support feet (35) are attached to non-predetermined locations by means of concrete anchoring elements (37) which are anchored or can be anchored in the concrete (18) of the annular support body (10). Positions along the ring circumference (31) of the annular support body (10) are firmly connected to the annular support body (10).

18. Coil assembly unit according to one of the preceding claims, characterized in that metallic coupling brackets (39) are formed between the upper ends (38) of the column-like insulators and the annular support body (10), which coupling brackets (39) are provided for the mechanical, load-transmitting connection between the upper ends (38) of the column-like insulators (11) and preferably the lower support plane (33) of the annular support body (10).

19. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) comprises an electrically conductive polarity conductor (41), which polarity conductor (41) is at least partially cast into the concrete (18) of the annular support body (10).

20. Coil assembly unit according to claims 18 and 19, characterized in that the individual metallic coupling consoles (39) are connected in series by means of the electrically conductive polarity conductor (41), wherein, however, the polarity conductor (41) does not form a closed ring structure, but only extends over a partial section of the ring circumference (31) of the annular support body (10).

21. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) has a polygonal shape with respect to its ring circumference (31), in particular is formed at least square to sixty-four-sided.

22. Coil assembly unit according to one of claims 1 to 6 and 8 to 21, characterized in that the annular support body (10) is formed in multiple parts, wherein the at least one joining plane (28) between joinable support body parts (26, 27) extends radially to an annular axis (29) of the annular support body (10).

23. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) has several cooling air channels (52) distributed over the ring circumference (31) in its ring body extending between its underside and its top side, which are provided for the passage of cooling air.

24. Coil assembly unit according to one of the preceding claims, characterized in that the annular support body (10) comprising concrete (18) has an axial height (53) which, measured between its upper support level (32) made of concrete (18) and a lower support level (33) made of concrete (18), is between 20 cm and 100 cm, preferably between 30 cm and 70 cm.

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