EP1406369A2 - Device for inductive coupling of electric signals to a voltage supply line and method for making a wound web - Google Patents

Abstract

Device for inductively coupling electrical signals (power line communications signals) with a voltage supply line (12) having an insulating sleeve (15) comprises a loop (13) made from a nanocrystalline or amorphous ferromagnetic material and consisting of two annular parts (16a, 16b). An Independent claim is also included for a process for processing a band coil made from a nanocrystalline or amorphous ferromagnetic material comprising feeding the band coil into a pot-like container, impregnating the coil with a casting composition and separating the coil into at least two parts.

Description

The invention first relates to a device for inductive coupling of electrical signals (PLC signals) to a current-carrying, in particular power supply line provided with an insulating jacket, if necessary according to the preamble of claim 1.

For data or signal transmission via an existing power supply network Many efforts are already to be realized been undertaken. A special aspect relates to the coupling of the PLC (= Powerline Communication) signals on high-voltage lines, Medium voltage lines and low voltage lines. The term signal coupling is intended to be bi-directional in the sense of the invention Enable data transfer, i.e. both the uploading of Signals on the power supply line as well as decoupling or Decouple those to be transmitted on the power supply line Signals.

The aim of the invention is to further develop the coupling point, wherein the type of signal coupling is inductive. Inductive signal coupling means that coupling indirectly through magnetic excitation of a magnetic Element is done and not in a capacitive way or by direct electrical contacting of the voltage supply line takes place.

The coupling of signals to a power supply line among other things then problems when the power supply lines are large Have cross sections, as is the case with high, medium and low voltage lines the case is. Should a signal coupling, for example, in the area of a transformer station is also the one available Installation space for such a device is narrowly limited.

Finally, it is known to directly couple a signal to make electrical contact with the power supply line. Here, however, the partially provided with an insulating jacket from very high currents to a few 100 amperes Power supply line processed by highly specialized experts stripping.

In addition, power supply lines have already been considered to grasp with so-called folding ferrites. That way an inductive signal coupling is already possible. Is problematic however, a saturation of this arrangement, which occurs at the high, through the power supply line flowing currents of maybe 300 or 400 Ampère to an impractical, only very limited use of the Device due to a very narrow, usable frequency band leads. In addition, such folding ferrites are regularly additional capacitive components are provided, so that at these intended coupling points only in a very narrow-band resonance range, which is caused by the Inductance of the folding ferrite together with the capacitive component is determined, signal transmission is possible. After all, they can Folding ferrites should not be too bulky.

The object of the invention is a device according to the Develop the preamble of claim 1 such that it improves inductive coupling of electrical signals to a power supply line allows.

The invention solves this problem with the features of claim 1, especially with those of the identification part, and is marked accordingly by an essentially ring-shaped one, of at least two parts Composable clamp made of nanocrystalline or amorphous, ferromagnetic Material.

The principle of the invention thus consists first of all in a clamp made of a special material. Unlike ferrites, which the desired magnetic properties for an optimized coupling of signals to a power supply line are nanocrystalline or amorphous, ferromagnetic materials for this in particular Way suitable.

Such materials, which are very expensive, in particular using rapid solidification technology by casting a melt with extremely rapid cooling, can be made directly into a thin strip, are for example at the company vacuum melt under the trade names Vitrovac and Vitroperm available. For example, more information is available at www.vacuumschmelze.de.

These are soft magnetic materials, i.e. such Materials in which the hysteresis loop is particularly narrow is.

Nanocrystalline or amorphous, ferromagnetic materials, for example, offer a particularly high initial permeability, which can be, for example, in the range from 20,000 or 40,000, but also above. A high initial permeability, ie a maximum µ _r with initial magnetic excitation by a current for the first time (i.e. the slope of a new curve in a BH diagram), is of particular importance.

The term amorphous expresses a special order characteristic of the ferromagnetic material, and describes the fact that in this material has no long-range order or crystal structure. This amorphous state corresponds to the material state immediately after Shock freezing. Through a subsequent heat treatment or tempering process finds a change in state from amorphous to nanocrystalline State instead. In this context, nanocrystalline means that the grain sizes of the magnetic areas in the nanometer range (middle Diameter 10 to 20 nm). Nanocrystalline materials are above it usually characterized by a two-phase structure in which a fine crystalline grain with the above mentioned grain diameter in one amorphous residual phase is embedded.

In addition to very high induction of saturation, the initial permeability plays as a physical quantity and measurable characteristic of these materials special role. For example, by using such materials with such high initial permeabilities as mentioned above in one assumed minimum coupling factor of - 3 dB and a lower one Transmission frequency of 2 MHz still an inductance L of the device from 4 µH can be reached.

More details on the type of device used Materials are described below.

A second aspect of the invention provides that the clamp nanocrystalline or amorphous, ferromagnetic material from at least is composed of two parts and is ring-shaped. In this way a device is possible that the power supply line on their Encompasses the outer surface, and due to the fact that it can be separated or dismantled or assemblability can be easily assembled, namely on the power supply line is attachable. The insulating jacket, if any the power supply line must not be injured for this become. The assembly and disassembly of the device according to the invention can therefore be carried out by specialist personnel who are not the must have the knowledge required for stripping.

If necessary, to ensure the cohesion of at least two To ensure parts in use, fasteners such as Screw connections may be provided. Alternatively, you can but also adhesive strips can be used because the clamp is not a special one is exposed to mechanical forces.

As a voltage supply line in the sense of this invention, for example also understood a medium-voltage line that has an inner, Electrically conductive core and an outer, electrically insulated shield, for example from a mesh of metallic threads. With these so-called Coax cables can with the device according to the invention The signals are coupled directly to the shield, and a Forward digitally through the shield. But it can also be provided be a signal coupling to the shield first and the signal for forwarding through a special circuit to transmit the inner soul, i.e. the core of the coax cable.

According to a further aspect of the invention, the clamp offers due to their geometric structure also the possibility of a Signal coupling to a voltage supply line also on such Make places where the power supply line is strong is curved. Because of a clamp-like design with a preferred the radius of curvature only plays a subordinate role Role.

According to one embodiment of the invention, the clamp is made of two essential semicircular parts assembled. this makes possible on the one hand an arrangement with a small number of components, so that the manageability is facilitated. On the other hand, with this configuration only two separating cuts, for example along a common one Diameter plane of a substantially circular band winding required so that the tape wrap is minimally damaged in its structure becomes.

According to a particularly advantageous embodiment of the invention the clamp is formed from a continuous annular band wrap, the is divided into at least two parts. This embodiment of the invention allows, among other things, the use of conventional, commercially available circular tape winding made of nanocrystalline or amorphous, ferromagnetic Material.

According to a further advantageous embodiment of the invention, the Tape wrap cut at least along one plane. A cut along one plane, especially along a common diameter plane, offers the possibility of reducing the risk of damage to the internal structure of the To keep tape wraps low.

According to a further advantageous embodiment of the invention the tape wrap is impregnated, especially before cutting like a potting compound. The provision of a potting compound offers the possibility of the tape wrap in its structure before the Reinforcing cutting, especially stiffening. A cutting one such reinforced tape wraps create a condition in the first place of the tape wrap, by separating it into two parts. The potting compound Depending on the delivery condition of the tape reel, it can be placed in open spaces, especially in the pores of the tape roll and in spaces between penetrate the layers. However, it is also conceivable that the potting compound essentially on the outer surfaces, for example on the Outer lateral surface and arranged on the ring end faces of the tape roll is and corset-like this surrounds the tape wrap.

According to a further advantageous embodiment of the invention, the Potting compound a resin, in particular a thermosetting epoxy resin or temperature-resistant polyester resin. This embodiment of the invention enables the use of inexpensive and commercially available casting compounds with particularly good workability and manageability.

According to a further advantageous embodiment of the invention, the Tape wraps have been vacuumed before impregnation and the Potting compound in free spaces, e.g. B. penetrated into pores of the tape roll. Providing vacuum before impregnation offers the possibility of one Particularly good and safe corset formation through the potting compound.

According to a further advantageous embodiment of the invention the clamp in the assembled state in the joint area two each adjacent parts a thin gap. The joining area, in other words, the area in which two adjacent parts are almost adjacent to each other bump is according to this advantageous embodiment with a thin, in particular defined gap. The gap can be, for example Have a width of the order of 10 µm and with air or paper, optionally also be filled with an adhesive strip. It is important that the Gap is filled with a non-magnetic and non-conductive material. In particular In this context it is important that the cut surfaces of the tape wrap in the assembled state of the clamp not directly against each other lie. In this context, it is also advantageous that the cut surfaces are particularly smooth or flat and do not form fringes show that would be disadvantageous for magnetic reasons.

The invention also relates to a method for processing an essentially annular tape winding made of nanocrystalline or amorphous, ferromagnetic material according to the preamble of the claim 16th

Such a processing method is not known. The commercial available tapes listed above are usually very brittle, and after a heat treatment, that is, after its transfer from the Amorphous even more brittle in the nanocrystalline state. The manufactured one In this way, tape wrap usually represents the final shape, i.e. the finished processed state of the tape reel. The known tape reel are usually transported in toroidal containers and are used as storage chokes. If necessary, a sintered material can also be used here can also be attached.

The object of this invention is a machining method according to the preamble of claim 16, which provide the use of the processed tape roll in a device for inductive Coupling of electrical signals to a current-carrying, in particular power supply line provided with an insulating jacket if necessary allows.

a) Einbringen des Bandwickels in ein topfartiges, evakuierbares Behältnis,

b) Imprägnieren des Bandwickels mit einer Vergussmasse,

c) Zertrennen des Bandwickels in wenigstens zwei Teile,

wobei der Bandwickel wenigstens im Bereich der Trennstellen imprägniert wird.The invention solves this problem with the features of claim 16, in particular with the features of the identification part, and is accordingly characterized by the steps

a) inserting the tape reel into a pot-like, evacuable container,

b) impregnating the tape roll with a casting compound,

c) cutting the tape roll into at least two parts,

wherein the tape roll is impregnated at least in the area of the separation points.

The principle of the invention is therefore essentially one conventional, finished, substantially ring-shaped tape winding, which a variety of winding layers nanocrystalline or amorphous, ferromagnetic Material is first to be placed in a container. Subsequently a potting compound can be introduced into the container with which the Tape wrap is impregnated or soaked. The potting compound is especially if according to an advantageous embodiment of the invention Container is evacuated and after inserting the tape wrap in the Container and before impregnating the tape roll with the tape roll a vacuum is applied due to the existing vacuum in the Free spaces, that is to say sucked into the gaps or pores of the tape roll. Even if no vacuum is applied, there is always Possibility of stiffening by attaching the sealing compound ensure that at least the surfaces, i.e. the outside of the tape wrap covered with casting compound. However, the application of a vacuum is clear more advantageous.

After impregnation, the tape wrap can be divided into at least two parts separated, for example cut. In principle, it is sufficient if the tape wrap impregnates at least in the area of those places at which a separation subsequently takes place.

The machining method according to the invention is one possibility ready the tape wrap first with a corset in the form of the potting compound to provide, which stiffens the tape roll so that it can subsequently be separated. Applying a vacuum to the Tape wrap before the impregnation process step ensures a particularly close concern of the corset-like casting compound or for a some intrusion, if necessary. The originally very brittle and not easily processed, not for subsequent processing suitable and not intended nanocrystalline or amorphous, ferromagnetic In this way, material is brought into a form in which the tape wrap is separable.

Fig. 1

schematisch in teilgeschnittener Ansicht einen Querschnitt durch eine erfindungsgemäße Vorrichtung zur induktiven Ankopplung von elektrischen Signalen mit einer Schelle sowie eine mit einer Isolierumhüllung versehene Spannungsversorgungsleitung,

Fig. 2

die Anordnung gemäß Fig. 1 etwa gemäß Ansichtspfeil 11 in einer perspektivischen, schematischen Ansicht,

Fig. 3

in vergrößerter Darstellung, einen Fügungsbereich zwischen zwei eine Schelle bildenden Teilen etwa gemäß Teilkreis III in Fig. 1, und

Fig. 4

schematisch, in teilgeschnittener Ansicht etwa gemäß Schnittlinie IV-IV in Fig. 1, unter Weglassung der Spannungsversorgungsleitung, und nicht maßstabsgetreu, einen bearbeiteten Bandwickel, wobei gestrichelt zusätzlich ein evakuierbares Behältnis dargestellt ist.

Further advantages of the invention result from the non-cited subclaims and from the following description of an embodiment shown in the figures. The drawings show:

Fig. 1

schematically in a partially sectioned view a cross section through a device according to the invention for the inductive coupling of electrical signals with a clamp and a voltage supply line provided with an insulating jacket,

Fig. 2

1 roughly according to view arrow 11 in a perspective, schematic view,

Fig. 3

in an enlarged view, a joining area between two parts forming a clamp approximately according to pitch circle III in Fig. 1, and

Fig. 4

schematically, in a partially sectioned view roughly according to section line IV-IV in Fig. 1, omitting the power supply line, and not to scale, a processed tape reel, with a dashed line also shows an evacuable container.

The device designated 10 in its entirety in the figures for the inductive coupling of electrical signals is first used 1 explained as follows:

A signal generator / signal receiver module, indicated only schematically 11 sends or receives electrical signals, particularly high-frequency ones Signals. Usually they are signals of a frequency range approximately between 2 and 20 MHz in which data is transmitted. The electrical signals are to be loaded onto a voltage supply line 12 are or tapped from this line 12, so that a Data transmission can be carried out via the power supply network can. The voltage supply line 12 is, for example, a high-voltage line, a medium voltage line or a low voltage line, on the typically AC voltage in the kilovolt range with a low one Frequency, for example 50 to 60 Hz is present. Because the signals are high frequency signals signal transmission and provision are impaired of electrical power through the power grid, which is primary the goal of the power grid is not.

1 is the voltage supply line 12 with an insulating jacket 15 provided. This does not have to be the case, but it is with the relevant power supply lines here.

1, the line 12 is on its outer surface by one Clamp 13 encircled, which consists of two substantially semicircular elements 16a and 16b.

The schematic, perspective view according to FIG. 2 becomes clearly that the clamp 13 is a substantially circular body. Between the inner peripheral surface 36 of the clamp 13 and the outer surface 37 of the voltage supply line 12 (Fig. 1) is an annular Free space 38, the arrangement and size of which is not critical. critical is, however, that a signal line 14 that is connected to the signal generator / signal receiver module 11 is connected, in the manner of a half winding grips the clamp 13 and for this purpose passes through the annular space 38.

The basic physical principle of such an inductive coupling of signals on a voltage supply line 12 is as follows:

High-frequency signals that are on signal line 14 call a magnetic excitation of the clamp 13 because it is made of ferromagnetic Material exists, whereby the material itself will be detailed later is received. The magnetic excitation gives the clamp 13 then on to the power supply line 12, namely in Form in turn of electrical impulses (voltages). The clamp acts thus in the manner of a transformer, the signal line 14 and the Power supply line 12 is a primary winding and correspondingly one Represent secondary winding of a transformer with the number of windings 1. Strictly speaking, the signal line 14 only grips the clamp 13 half a winding and the power line 12 due to their large, approximate infinite length the clamp 13 also only in the manner of a half Winding. A consideration such that power line 12 and signal line 14 actually represent an entire winding with this geometry allowed.

With this arrangement, on the one hand, the broadest possible bandwidth is desired Transmission range, that is, only a very low attenuation of Signals in a wide frequency range. In other words, is a uniform coupling factor over a large frequency range advantageous.

On the other hand, it is of particular importance that the constantly on the Power supply line 12 remaining clamp 13 the basic function of the power supply network is not hindered. Here is particular it should be noted that 12 currents of up to flow to some 100 A, typically up to about 300 or 400 A, so that with regard to the magnetic properties of the clamp 13 special requirements are to be provided, and in particular saturation is prevented.

The solution according to the invention provides that the clamp 13 is made of nanocrystalline or amorphous, ferromagnetic material. Such a thing Material is an alloy called a soft magnetic material becomes. In this context, soft magnetic means that the Hysteresis curve, i.e. the curve in a B-H diagram, is a special one represents a narrow hysteresis loop. The narrower the hysteresis loop, that is, the smaller the area between the two branches that a or movement (e.g. an alternating current through the voltage supply line 12), the lower the electrical losses, which mean a conversion into thermal energy.

The alloy composition of these materials usually forms from the basic elements iron, cobalt and nickel as well as additional ones Elements such as silicon, boron, manganese, copper, niobium, or molybdenum Chrome. The exact nature of the composition, both in terms of the nature of the Components and their proportions will not be discussed further here. However, nanocrystalline or amorphous, ferromagnetic materials are commercial, available for example from the company vacuum melt. The production such materials is extremely complicated, instead of one conventional melting with subsequent rolling process, as in crystalline materials is the case by means of rapid solidification technology Pour the material directly into a melt with extremely rapid cooling a thin tape is made. The tapes are usually at very low temperatures, for example nitrogen-cooled, towards the coils a tape winding (toroidal tape core) wound.

Such a tape wrap is initially shown schematically in FIG. 4 and designated by reference numeral 23. A tape wrap 23 exists from a large number of winding layers 19, starting from a radially innermost one Winding layer 20 with a radial inner end, not shown, up to a radially outer winding layer 21 with an outer, also not shown radial end are wound. The commercially available tapes usually have strip thicknesses in the µm range, that is, a winding layer 19 of such a tape roll 23 has a tape thickness of, for example 23 µm (about 20 to 25 µm). A tape wrap 23 as it is commercially available is extremely brittle and cannot be easily processed. The Material of the tape roll, i.e. nanocrystalline or amorphous, ferromagnetic According to the invention, material is used to produce a clamp 13. First of all, the processing method for processing a Tape winding 23 made of nanocrystalline or amorphous, ferromagnetic Material to be explained.

4, the tape roll 23 is a circular one Body, which is initially only schematic in one in the right half of FIG. 4 indicated cup body 22 is arranged. The cup body 22 has a substantially U-shaped cross section with a bottom wall 39 and two side walls formed by the U-legs 40a, 40b, so that an annular groove-like receptacle for the tape roll 23 is provided. in the The area of the side walls are also as shown in the left half of Fig. 4 makes clear, silicone cushion elements 24a and 24b are provided, which store vulnerable tape wrap 23 soft. For the sake of clarity, that is with respect to a central longitudinal axis M right half of FIG. 4 only schematically indicated and the left half of Fig. 4 shown in more detail.

At a machining operation engaging in the material of the tape roll 23 the tape wrap 23 is due to the brittle, highly fragile condition not to think of the tape wrap.

According to the invention, the tape roll 23 is processed together introduced with the cup 22 in an evacuable container 25 which in Fig. 4 is shown in dashed lines. The evacuable container 25 has Bottom element 27, a central, centrally arranged mandrel 26 and side walls 28 so that an annular groove-like receiving space for the cup 22 and the tape wrap 23 is provided. The container 25 is now closed by a cover element 29.

A schematically indicated air outlet 30 is used for the connection a pump, so that the interior of the container 25 can be evacuated can. A merely schematically indicated with the reference number 31 designated inlet serves to introduce a potting compound 32. The potting compound 32 is in particular a resin, for example a thermosetting one Two component epoxy resin. The potting compound 32 penetrates into the evacuated Interior of the container 25 and can now all in the area of the tape wrap 23 fill in the free space. For example the potting compound 32 in free spaces between two individual, adjacent Penetrating layers 19 penetrate and possibly even in the smallest pores. The The arrangement of the inlets and outlets 31, 30 is of course only schematic to understand.

After the potting compound 32 has hardened, it provides a Tape wrap 23 enveloping body in the manner of a stiffening structure ready. Now the lid element 29 of the container can be opened and the cast tape roll 23 can be removed. Because of the along the The potted tape roll has the center longitudinal axis M of the aligned mandrel 26 23 corresponding to a central inner recess, which in the state of use according to the device 10 from the voltage supply line 12 Figures 1 and 2 is reached. In this context is on it to point out that the representation of Figures 1 to 4 is not to scale are only understood in terms of their geometric relationships is to illustrate the invention in an illustrative manner.

The cast tape wrap 23 can now be diamond-tipped Saw, alternatively for example also by means of a water jet cutting system, optionally with laser or plasma beam, along a Cutting plane E, ie roughly along the paper plane of FIG. 4, in two semicircular Halves 16a and 16b are cut. Of special It is important that the material areas of the potting compound 32 in the area of the ring end faces 34a and 34b of the tape roll 23 and rest on them How to prevent the winding layers 19 from breaking out when cutting.

In addition, a material is usually used for the casting compound chosen which has a high glass transition temperature, advantageously above 100 ° C. This way, even at such high, during the Machining temperatures did not change the rigidity of the potting compound on.

After performing the cutting process, the cut surfaces 33a, 33b (FIG. 3) advantageously with a cover, for example one Apply adhesive tape or a varnish. The very flat, smooth cut surfaces 33a, 33b are essentially free of fraying and by the attached cover, not shown, from further damage protected.

The two now finished halves 16a, 16b of the substantially annular clamp 13 can now around a power supply line 12 can be attached around. There are usually separate ones for this Fastening elements, in the simplest case one indicated in FIG. 2 Adhesive strips 25 are provided for cohesion of the two parts 16a, 16b. Of course, screw connection elements or Like. Provided, and optionally also integrally as one piece Be part of the potting compound 32 with molded.

In the circumferential direction u of the clamp 13, ie the course of the winding layers 19, an almost continuously continuous body is formed, the due to the split, two-part arrangement in the area of two joining areas 17 each have a gap 18. The gap 18 is there not necessarily due to the composite arrangement of the Clamp 13 exists and is accepted, but is important essential and influences the magnetic properties of the clamp 13 positive. In particular, by arranging a gap 18 there is a change the characteristic of the device 10 possible, in particular a flatter Rise in the B-H characteristic curve, which increases the risk of saturation induction very high currents is further reduced.

According to the invention, the gap 18 has a width d in the range of approximately 10 µm and is covered with a non-conductive and non-magnetic medium, for example filled with paper. The gap 18 can also be an air gap be trained.

Claims (22)

Device (10) for the inductive coupling of electrical signals (PLC signals) to a voltage supply line (12), in particular through which current flows and optionally provided with an insulating sheath (15), characterized by an essentially ring-shaped one which can be assembled from at least two parts (16a, 16b) Clamp (13) made of nanocrystalline or amorphous, ferromagnetic material. Device according to claim 1, characterized in that the parts (16a, 16b) extend essentially along an arc of a circle. Apparatus according to claim 1 or 2, characterized in that the clamp (13) is composed of two substantially semicircular parts (16a, 16b). Device according to one of claims 1 to 3, characterized in that the clamp (13) is formed from a continuous ring-shaped tape winding (23) which is divided into at least two parts (16a, 16b). Apparatus according to claim 4, characterized in that the tape roll (23) consists of a plurality of layers of material (19, 20, 21), each having a thickness of a few µm, for example 20 µm. Apparatus according to claim 4 or 5, characterized in that the tape roll (23) is cut along at least one plane (E). Apparatus according to claim 6, characterized in that the tape roll (23) has an impregnation, in particular applied before cutting, in the manner of a potting compound (32). Apparatus according to claim 7, characterized in that the potting compound (32) is a resin, in particular a heat-curing epoxy resin or a temperature-resistant polyester resin. Apparatus according to claim 7 or 8, characterized in that the tape roll (23) has been subjected to a vacuum before the impregnation and the casting compound in free spaces, for. B. has penetrated into the pores of the tape roll. Device according to one of the preceding claims, characterized in that in the assembled state the clamp has a thin gap (18) in the joining area (17) of two adjacent parts in each case. Apparatus according to claim 10, characterized in that the gap (18) with a filling medium, for. B. is filled with air or with paper. Device according to claim 10 or 11, characterized in that the gap (18) is between 3 µm and 30 µm, in particular about 10 µm wide (thickness d). Device according to one of the preceding claims, characterized in that the material has an initial permeability of at least 20,000, in particular an initial permeability of approximately 40,000. Device according to one of the preceding claims, characterized in that the clamp (13) has at least one fastening element (35) for connecting the parts (16a, 16b) to one another. Device according to claim 14, characterized in that at least one adhesive strip is provided as the fastening element (35). Method for processing an essentially ring-shaped tape roll (23) made of nanocrystalline or amorphous, ferromagnetic material, characterized by the steps: a) introducing the tape roll into a pot-like container (25), b) impregnating the tape roll (23) with a casting compound (32), c) cutting the tape roll (23) into at least two parts (16a, 16b), wherein the tape roll (23) is impregnated at least in the area of the separation points. A method according to claim 16, characterized in that the container (25) can be evacuated and the following step is carried out between step a) and step b): d) loading the tape roll (23) with a vacuum. A method according to claim 16 or 17, characterized in that the casting compound (32) consists of a resin, in particular of a heat-curing epoxy resin, for example a two-component epoxy resin, or of a temperature-resistant polyester resin. Method according to one of claims 16 to 18, characterized in that the casting compound (32) has a glass transition temperature of more than 100 ° C. Method according to one of claims 16 to 19, characterized in that between step b) and c) the step is carried out: e) curing the casting compound (32), especially at high temperatures. Method according to one of claims 16 to 20, characterized in that step c) is carried out by means of a cutting device, in particular by means of a diamond saw or a water jet cutting device. Method according to one of claims 16 to 21, characterized in that after step c) the following step is carried out: f) covering the cut surfaces (33a, 33b) of the tape roll (23), for example by means of an adhesive tape or by means of lacquer.

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