DE102017109563A1 - Flat-band conductors for high-voltage direct current connection of offshore wind farms, as well as methods for the production of these - Google Patents

Abstract

The invention relates to a flat strip conductor (1 ') for the high-voltage direct current connection of offshore wind farms, comprising at least one component combination with a first component (1, 11), comprising a steel material and a second component (2, 6, 13) comprising elementary Copper, wherein the first (1, 11) and the second component (2, 6, 13) are positively connected to each other. In addition, the invention relates to a method for producing the ribbon conductor and a power transmission system with at least two ribbon conductors.

Description

The invention relates to a flat strip conductor for a high-voltage direct-current connection of offshore wind farms, and to a method for producing and laying the flat strip conductor.

The electrical connection of offshore wind farms for the transmission of electricity generated energy to a feed station on land currently takes place via a submarine cable solution, consisting of stranded individual cores, which can be considered both from the point of view of size and cost reasons as extremely problematic. Decisive here is both the long length, i. up to 60 km, this energy transmission technology, as well as the poor connectivity of cable ends wound wires together, especially if it is a three-phase transmission.

Currently, there is the possibility to realize this connection by means of high-voltage direct current (HVDC). The technique and characteristics are a bipolar high-voltage DC transmission with preferably ± 100 kV rms and a peak power of 0.5 gigawatts, a benchmark that is quite common in current projects [Hau, E .: Wind turbines: fundamentals, technology, use, economy. 5th, newly edited edition. ISBN 978-3-642-28876-0, Springer-Vieweg Verlag, Berlin, 2014 ].

In a three-phase transmission, it is necessary to lay a bulky ladder combination, consisting of three wound strands, as a total cable by ship on the seabed in one piece. In three-phase high voltage applications, it takes an incredibly high amount of work and time to connect two cables together during the laying process, or even to perform a repair at sea.

Out DE 4210202A1 a battery cable for automotive application is known in which the wound strands form a flat stripline structure. The then applied insulation of plastic is then heated again after bending to the melting point, so that it partially seeps liquid between the strands. The application is advantageous in motor vehicles, since the cable can be placed over longer plug in the car, without a bead for it must be formed into the sheet. This avoids the danger that due to a round structure of a cable at steel edges a chafing takes place and it thus comes to a short circuit.

DE 102007027858 A1 discloses a flat-band double conductor designed for the 1 kV and 100 A limits. Its application lies in the electric vehicle, where it has mechanical and electrical advantages. The flat-ribbon double conductor has a sheath with plastic insulation material and rounded corners. Advantages are described by a compensation of the magnetic field generated by the current flow.

Out DE 102012217618 A1 a method for casting over a contour-shaped flat conductor is known. Here, a ribbon multi-conductor is described, which has its application in electric vehicles, the line strands should be adjusted horizontally and vertically in advance the body structures by bending. Its intended length is approx. 5 m, the voltage values are approx. 100 V.

The conductors are previously isolated from each other by intermediate layers. The sheathing is done by means of plastic insulation material by casting. Described are various methods of spacing the metallic interconnects in the casting tool. In addition, various methods of forming electrical connections of the strip conductors are listed.

In EP 1349180 A1 describes a flat-conductor electrical conductor designed for the limits of up to 100 A at low voltages. Their application lies in the electric vehicle, but also in electrical applications with standard motor vehicles. The peculiarity here is that per line element two metal strips, mainly of copper, are provided one above the other in electrical, but not in mechanical connection to each other.

There is a sheath with plastic insulation material, wherein the corners of the ladder are rounded.

EP1688966 B1 discloses electrical flat band conductors for motor vehicles. Here a ribbon cable is described, which is intended for the limits of up to 100 A at low voltages in the car. Its application is exclusively in the electric vehicle. The special feature here is that it can be single-pole or multi-pole. There are various cross-sectional profile suggestions. It is in the unipolar variant to a metal flat conductor, which is molded with plastic insulation material. For this purpose, various plastics are specified.

The conductor itself is made of heat-treated aluminum so that it can be wound up on a coil. The possibility of continuous Fabrication by means of an extruder is also disclosed. The electrical contact is made by means of welded bolts, many different welding methods are given. The possibility of rounding the edges of the flat conductor is also disclosed, but has rather no importance for the field guidance at high voltage, since such an application is not provided here at all. The application described assumes only a conductor length of up to 10 m.

Known from EP 2662866 B1 is a multi-layered electrical ribbon cable. It is a supplementary patent to EP 1688966 B1 in the same field of application. Here the cable cross-sections and their design are described by means of a combination of power-conducting and signal-carrying conductors. In addition, the connection of conductor pieces has been described by means of different welding methods. The application also refers exclusively to the low voltage range.

In US 5,687,602 describes a conductor for flat cables and its manufacturing method. The subject matter is the creation of a multi-conductor ribbon cable made of insulating plastic-coated cable strips for the transmission of small power in electrical equipment and systems. The final thickness of the strip is given in the micrometer range.

The special here is the production of the conductor strips, which are to be made of conductive round material, mainly copper and lead-tin solder, by rolling.

Resulting rounded edges of the ladder. During manufacturing additional heat treatment steps are provided to make the material stress-free and better formable. The electrical connection is done here by unilateral stripping and converting the liberated cable ends to a plug. The planned application is aimed exclusively at the low voltage range.

Out WO 01/50482 is the creation of a multi-conductor ribbon cable made of insulating plastic-coated cable strip for the transmission of power and message signals known. Two strands are provided for each of the two tasks. The load-carrying conductor strands are each arranged in the flat construction of the cable on the outer sides and consist of up to 10 conductive flat bands that are neither interconnected nor isolated from each other.

This results in a very good bending ability, which is advantageous for use in motor vehicles with electrical equipment. In addition, there are two flat superimposed inner conductors, which are used for message transmission. Again, the planned application refers exclusively to the low voltage range with additional data transmission.

Against this background, the object of the present invention is to overcome the aforementioned drawbacks.

This object is achieved by a ribbon conductor according to claim 1, a transmission system according to claim 3 and a method according to claim 4, as well as the further advantageous embodiments according to the subclaims.

• - ersten Bauteil (1, 11), umfassend einen Stahlwerkstoff und
• - einem zweiten Bauteil (2, 6, 13), umfassend elementares Kupfer, wobei das erste (1, 11) und das zweite Bauteil (2, 6, 13) formschlüssig miteinander verbunden sind.

Proposed is a ribbon conductor (1 ') for the high-voltage DC connection of offshore wind farms, comprising at least one component combination with a

• - First component (1, 11), comprising a steel material and
• - A second component (2, 6, 13), comprising elemental copper, wherein the first (1, 11) and the second component (2, 6, 13) are positively connected with each other.

The material mix in the conductor (1 '), paired with a teflon insulation and the seawater alignment according to the single-conductor principle, as well as the fast thermal Verbindbarekeil the conductor proves to be a particular advantage of the present invention.

The entire laying length can be made in one piece, brought on board and then laid in one piece on the seabed.

In a DC transmission, several conductors can be laid independently of each other on the seabed for electrical reasons. This results in advantages of windability on a coil together with the creation of a quick connection of individual pieces with each other, thus offering a good repair option. The significant cost advantage is another argument in favor of using this innovative technology.

The flat strip conductor (1 ') according to the invention may comprise a thin steel support (1) which is provided with a conductive layer (2), preferably copper, for current-conducting purposes. As an insulator is a sheath of a plastic (3), preferably Teflon, proposed, since this material by its consistency thermally high is resilient, ie above 200 ° C and a sufficient dielectric strength for the single-phase voltages mentioned here relative to the ground potential, ie seawater has. The final outer coating is formed by a protective layer (4), preferably PVC, in order to protect the arrangement from influences from seawater or from mechanical damage.

In one embodiment of the invention, the flat strip conductor (1 ') comprises a plastic insulation (3, 8, 14), preferably comprising Teflon, with a wall thickness of the plastic insulation (3, 8, 14) in the range between 0.5 cm - 2 cm, preferably in the range of 1.0 cm, such that the plastic insulation (3, 8, 14) has a dielectric strength of at least 200 kV relative to the surrounding salt water at ground potential and additionally comprising a protective insulating layer (4, 9, 15).

Proposed is a power transmission system (1 ") comprising at least two ribbon conductors (1 ').

• - Bereitstellung von zwei Flachbandleitern (1'), Anformung der Flachbandleiter derart, dass das zweite Bauteil (2, 6, 13) auf den Enden (E₁, E₂) der Flachbandleiter (1') entfernt wird, Zungen (Z₁, Z₂) und ein Hohlraum (7) gebildet werden,
• - Verbinden der Zungen (Z₁, Z₂) mittels einer Schweißnaht (5),
• - Bereitstellung einer Form (10), in welcher der Hohlraum (7) unter Flussmittelzugabe mit Kupfer ausgegossen wird,
• - Entfernen der Form (10) und
• - Aufbringung einer Kunststoffisolierung (3, 8, 14) zwischen den Ebenen (I₁, I₂), die aus einem Pulver generiert wird und
• - Aufbringung einer Schutzschicht (4), (9), (15) auf die Kunststoffisolierung (3, 8, 14).

Proposed is a method for laying a power transmission system (1 "), comprising at least two flat-band conductors (1 '), wherein the method comprises at least the following steps:

• - Provision of two ribbon conductors (1 '), molding of the ribbon conductor such that the second component (2, 6, 13) on the ends (E ₁ , E ₂ ) of the ribbon conductor (1') is removed, tongues (Z ₁ , Z ₂ ) and a cavity (7) are formed,
• Connecting the tongues (Z ₁ , Z ₂ ) by means of a weld seam (5),
• Providing a mold (10) in which the cavity (7) is filled with copper while adding flux,
• - Remove the mold (10) and
• - Application of a plastic insulation (3, 8, 14) between the planes (I ₁ , I ₂ ), which is generated from a powder and
• - Application of a protective layer (4), (9), (15) on the plastic insulation (3, 8, 14).

In order to bring about the required final contour of the connection point, carrying out a grinding process has proved to be advantageous.

Against external damage to the insulating material may preferably be a colored PVC coating layer used.

According to the invention, the connection of the individual Flachbandleitercoils can be done in a small amount of time and while maintaining the full conductivity by first a tongue of the steel material, preferably in the MAG process, is welded (5), then in a temporarily mounted form (10) (6), (7), (12), after which a grinding process is carried out, which carries out the smoothing and rounding required for the high-voltage guidance, after which a supplementing of the insulation is carried out (8), (14) , which is formed by Teflon from a thermally applied powder phase, and that after a shaping grinding process for rounding the edges of this compound is finally thermally by a protective layer (9), (15), preferably colored PVC, coated.

The production of such a ribbon conductor can be carried out continuously by means of rolling processes with the aid of an extrusion process for the plastics. First, the connection between the steel beam and the conductive layer, which is preferably made of copper, must be created.

Due to the small thickness of this layer, preferably 3 mm, and the width of the steel strip, which should be at least 30 cm, in addition to the casting, other coating methods such as hot rolling or electroplating come into question.

At the isolation capability of Teflon high demands are made here. According to Elias, H.-G .: Macromolecules. Applications of polymers. 6. completely over-worked and extended edition. ISBN 978-3-527-62651-9 , Wiley Verlag, Wein-heim, 2009, it has breakdown strengths that exceed the dimensional requirements, about 1 cm, significantly. However, this also depends on the type of production and the connection with the metallic conductor.

In order to be able to assemble a continuous line up to approx. 60 km in length from coil-wound and thus easily transportable individual pieces, the possibility of a fast and reliable connection technique between the individual sections is required. This must also be able to be carried out on board a laying vessel at sea.

According to the invention this should be carried out in 5 phases, as in 2 is clarified. First, the conductive connection of the consisting of a material mix flat conductor must be created. Thereafter, the insulator and the protective layer must be completed again. The time required to create such a connection is extremely small and less than 1 hour since most of the time it is a thermal process. This also applies to the execution of a repair.

1. 1. Erstellen einer Schweißverbindung der beiden Stahlbänder miteinander, vorzugsweise nach dem MAG-Verfahren (5), (11)
2. 2. Erstellen der elektrischen Verbindung durch einseitigen Verguss, Verlötung oder Verschweißung eines Zwischenstückes der vorzugsweise aus Kupfer bestehenden leitfähigen Beschichtung (6), (7), (13) in einem Formwerkzeug (10) mit Überstand (12)
3. 3. Profilschleifen der Verbindungsstelle und Abrunden der Kanten
4. 4. Vervollständigen der Isolationsschicht durch Pulversintern mit Teflon (8), (14)
5. 5. Abschließendes ummanteln mit PVC durch vorzugsweise extrudieren (9), (15)

The bonding process between the strip conductors of two coils is in 2 in longitudinal section and in 3 shown in cross-section and is made as follows:

1. 1. Creating a welded joint of the two steel strips together, preferably according to the MAG method (5), (11)
2. 2. Creating the electrical connection by one-sided encapsulation, soldering or welding of an intermediate piece of the preferably made of copper conductive coating (6), (7), (13) in a mold (10) with projection (12)
3. 3. Profile grinding of the joint and rounding of the edges
4. 4. Completing the insulating layer by powder sintering with Teflon (8), (14)
5. 5. Final encapsulation with PVC by preferably extruding (9), (15)

To carry out this connection technique, the ends of the two ribbon conductors must be prepared accordingly already in production. This includes that the steel strip (1), (11) is about 0.5 m free of the conductive layer and protrudes from the connection point. The front edge may need to be prepared by a bevel for the welding process.

The execution of the weld joint (5), to which preferably the MAG method is applied, is carried out with lateral fixing of the sheets in order to avoid too high heat input into the rest of the conductor structure and distortion of the strip itself. This is followed by a grinding process to remove the vertical protrusions from the seam.

For the connection of the conductive layers with each other, the casting with copper is preferably provided because its melting temperature is significantly lower than that of steel [3]. For this purpose, the previous connection points (6) must be previously bevelled. Also, a laterally executed molding tool (10), which is preferably coated with platinum, must be applied in a fixing fixture.

Alternatively, it is also possible to introduce a thin copper sheet (7), which is connected to the counter conductor on both sides by a welded connection or by a brazing process. A subsequent shaping grinding process must then eliminate all projections (11), (12), so that the in 1 and 3 shown rounded edges arise. This is necessary because otherwise voltage spikes would arise that would overload the dielectric strength of the insulation material.

To connect for 2 and 3 To be able to achieve a faster production of the insulating layer, which preferably consists of Teflon, a powder generation under high pressure and high temperature must be carried out (8), (14).

In order to obtain a sufficiently high dielectric strength at the seams, this manufacturing method should be carried out with the aid of a heat-generating and pressure-exerting form. Then, the outer protective layer must be supplemented, which preferably consists of colored PVC (9). This can be done by a granulate-fed extruder, which also includes mold elements to ensure the uniformly thick job.

These processes can all be carried out on-site on a special vessel, so that the size of the individual flat-ribbon coils can be kept small and they can even be transported on the road.

In the case of sea shifting, in order to absorb the length variations caused by the thermal expansion, the strip conductors must be transported in light meanders to the seabed. A flat lying on the seabed and a silting protect the ladder from damage by shipping. One strand can be laid on the way there, the other on the way back. A third reserve manager for increasing the security of the connection is also possible.

A 100% overload is possible due to the temperature resistance of the insulation material and the good cooling of the seawater for a limited time, so that even in the longer term high currents can be exploited at wind force peaks. This option represents an increase in the economic efficiency of offshore wind farms. Thanks to its compact mechanical structure, the ribbon cable can also be used up to 300 bar (3000 m sea depth), making it fully suitable for North Sea conditions. The connection to the onshore supply station can be made coaxially by a short submarine cable or by a mineral-based electricity pipeline.

• • Kontinuierliche Fertigung durch Walzen, Stranggießen und Extrudieren
• • Einfache Verlegung vom Coil durch schnelle Verbindung der einzelnen Stücke miteinander
• • Geringe Verlustleistung bei Gleichstromübertragung (ca. 3% bei 60 km Anbindungslänge)
• • Gute Kühlung durch das Meerwasser und temperaturbeständiges Isolationsmaterial (bis ca. 260° C)
• • Durch die flache Ausführungsform resistent gegenüber möglich Beschädigungen am Meeresgrund durch den Fischereibetrieb
• • Einfache Reparatur durch die schnelle Aneinanderfügung der einzelnen Stücke möglich
• • Deutlich kostengünstiger gegenüber einer gleichwertigen Seekabel-Lösungen

The advantages of such a Teflon-insulated ribbon conductor are:

• • Continuous production by rolling, continuous casting and extrusion
• • Easy installation of the coil by quick connection of the individual pieces with each other
• • Low power loss with DC transmission (about 3% with 60 km connection length)
• • Good cooling through the seawater and temperature-resistant insulation material (up to approx. 260 ° C)
• • Due to the flat design resistant to possible damage to the seabed by the fishing industry
• • Simple repair due to the quick joining of the individual pieces possible
• • Significantly less expensive than equivalent submarine cable solutions

This technology is low-loss, high-strength against environmental influences and maintenance-free. The external pollution of the environment through hazards, heat dissipation and electric fields is so minimal that this current pipeline can be laid almost anywhere without authorization. The complete recyclability of the material is also given.

It is also possible to lay the device according to the invention through bodies of water by means of sludging, integration into tunnel or bridge constructions or a raised dam-like structure for crossing mountains.

Due to the mechanical resistance and the ideal corrosion protection, the current pipeline forms a long-term alternative to existing power lines.

By way of example, embodiments of the invention are illustrated and described in more detail in the following figures, the invention being not limited thereto.

• 1: schematisch den Aufbau eines Flachbandleiters (1') für die Hochspannungs-Gleichstromanbindung von Offshore-Windparks,
• 2: schematisch den Längsschnitt einer Verbindungsstelle des Flachbandleiters (1'), und
• 3: schematisch den Querschnitt der Verbindungsstelle aus 2 mit einem Formwerkzeug.

Show it:

• 1 FIG. 2 schematically shows the construction of a flat conductor (1 ') for the high-voltage direct current connection of offshore wind farms,
• 2 FIG. 2 schematically shows the longitudinal section of a connection point of the ribbon conductor (1 '), and FIG
• 3 schematically shows the cross section of the joint 2 with a mold.

In the 1 schematically the structure of a ribbon conductor ( 1' ) for the high-voltage direct current connection of offshore wind farms.

The ribbon conductor ( 1' ) comprises by way of example at least one component combination with a first component ( 1 . 11 ) comprising a steel material and a second component ( 2 . 6 . 13 ) comprising elemental copper, the first ( 1 . 11 ) and the second component ( 2 . 6 . 13 ) are positively connected with each other.

In addition, a plastic insulation ( 3 . 8th . 14 ), preferably comprising Teflon, with a wall thickness of the plastic insulation ( 3 . 8th . 14 ) in the range between 0.5 cm - 2 cm, preferably in the range of 1.0 cm, such that the plastic insulation ( 3 . 8th . 14 ) has a dielectric strength of at least 200 kV with respect to the surrounding salt water at ground potential and additionally comprising a protective insulating layer ( 4 . 9 . 15 ).

For this reason, according to the invention, a flat conductor concept is proposed here for solving the problem, which consists of a thin steel support ( 1 ) which, for power line purposes, has a conductive layer ( 2 ), preferably copper. As an insulator is a sheath made of a plastic ( 3 ), preferably Teflon, proposed, since this material is thermally highly loadable by its consistency (above 200 ° C) and has a sufficient dielectric strength for the individual stresses mentioned here with respect to the ground potential (seawater). The final outer coating is covered by a protective layer ( 4 ), preferably PVC, formed to protect the assembly from the effects of seawater or mechanical damage.

The production of such a ribbon conductor can be carried out continuously by means of rolling processes with the aid of an extrusion process for the plastics. First, the connection between the steel beam and the conductive layer, which is preferably made of copper, must be created. Due to the small thickness of this layer, preferably 3 mm, and the width of the steel strip, which should be at least 30 cm, in addition to the casting, other coating methods such as hot rolling or electroplating come into question.

At the isolation capability of Teflon high demands are made here. According to [Elias, H.-G .: Macromolecules. Applications of polymers. 6. completely over-worked and extended edition. ISBN 978-3-527-62651-9, Wiley Verlag, Weinheim, 2009] it has dielectric strength, the dimensional requirements, about 1 cm, resulting from the information in 1 surrendered, clearly overachieving. However, this also depends on the type of production and the connection with the metallic conductor.

In order to be able to assemble a continuous line up to approx. 60 km in length from coil-wound and thus easily transportable individual pieces, the possibility of a fast and reliable connection technique between the individual sections is required. This must also be on Can be performed on board a laying vessel at sea.

In the 2 schematically the longitudinal section of a junction of the ribbon conductor ( 1' ).

According to the invention, this connection point is to be executed in five phases, as shown in FIG 2 is clarified. First, the conductive connection of the consisting of a material mix flat conductor ( 1' ) be created. Thereafter, the insulator and the protective layer must be completed again. The time required to create such a connection is extremely low (<1h), since most of the time it is a thermal process. This also applies to the execution of a repair.

It turns ( 5 ) is a weld, ( 6 ) a copper conductor, ( 7 ) an original cavity, the bonding process with the same material ( 6 ), ( 8th ) a plastic insulation and ( 9 ) a protective insulation layer.

1. 1. Erstellen einer Schweißverbindung der beiden Stahlbänder miteinander, vorzugsweise nach dem MAG-Verfahren (5), (11)
2. 2. Erstellen der elektrischen Verbindung durch einseitigen Verguss, Verlötung oder Verschweißung eines Zwischenstückes der vorzugsweise aus Kupfer bestehenden leitfähigen Beschichtung (6), (7), (13) in einem Formwerkzeug (10) mit Überstand (12)
3. 3. Profilschleifen der Verbindungsstelle und Abrunden der Kanten
4. 4. Vervollständigen der Isolationsschicht durch Pulversintern mit Teflon (8), (14)
5. 5. Abschließendes ummanteln mit PVC durch vorzugsweise extrudieren (9), (15).

The bonding process at the junction between the strip conductors of two coils is in 2 in longitudinal section and in 3 shown in cross-section and is made as follows:

1. 1. Creating a welded joint of the two steel strips together, preferably by the MAG method ( 5 ) 11 )
2. 2. Creating the electrical connection by one-sided encapsulation, soldering or welding of an intermediate piece of the preferably copper existing conductive coating ( 6 ) 7 ) 13 ) in a mold ( 10 ) with supernatant ( 12 )
3. 3. Profile grinding of the joint and rounding of the edges
4. 4. Complete the insulation layer by powder sintering with Teflon ( 8th ) 14 )
5. 5. Final encasing with PVC by preferably extruding ( 9 ) 15 ).

To carry out this connection technique, the ends of the two ribbon conductors must be prepared accordingly already in production. This includes that the steel strip ( 1 ) 11 ) is about 0.5 m from the conductive layer and protrudes from the junction. The front edge may need to be prepared by a bevel for the welding process.

The execution of the welded connection ( 5 ), to which preferably the MAG method is used, takes place with lateral fixing of the sheets, in order to avoid too high a heat input into the remaining conductor structure and a distortion of the tape itself. This is followed by a grinding process to remove the vertical protrusions from the seam.

For the connection of the conductive layers with each other, the casting with copper is preferably provided because its melting temperature is significantly lower than that of steel [N .; N .: formulary: formulas, tables, data. 1st edition. ISBN 978-3-89818-700-8, DUDEN PAETEC Schulbuchverlag, Berlin, Mannheim, 2013]. For this purpose, the previous connection points ( 6 ) Beveled beforehand. Also, in a fixation holder, a laterally executed molding tool ( 10 ) which is preferably coated with platinum. Alternatively, the introduction of a thin copper sheet ( 7 ) possible, which is connected by a welded joint or by a brazing process on both sides with the counter conductor. A subsequent shaping grinding process must then clear all protrusions ( 11 ) 12 ), so that the in 1 and 3 shown rounded edges arise. This is necessary because otherwise voltage spikes would arise that would overload the dielectric strength of the insulation material.

To connect for 2 and 3 To be able to afford a faster production of the insulating layer, which preferably consists of Teflon, a powder generation under high pressure and high temperature must be carried out ( 8th ) 14 ). In order to obtain a sufficiently high dielectric strength at the seams, this manufacturing method should be carried out with the aid of a heat-generating and pressure-exerting form. Then, the outer protective layer must be added, which preferably consists of colored PVC ( 9 ).

The illustrated figures show the applicability of the developed device, demonstrate possibilities for their production, wherein the invention is not limited to the indicated uses and materials and combinations thereof.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4210202 A1 [0005]
• DE 102007027858 A1 [0006]
• DE 102012217618 A1 [0007]
• EP 1349180 A1 [0009]
• EP 1688966 B1 [0011, 0013]
• EP 2662866 B1 [0013]
• US 5687602 [0014]
• WO 0150482 [0017]

Cited non-patent literature

• E .: Wind turbines: fundamentals, technology, use, economy. 5th, newly edited edition. ISBN 978-3-642-28876-0, Springer-Vieweg Verlag, Berlin, 2014 [0003]
• ISBN 978-3-527-62651-9 [0034]

Claims (4)

Flat-band conductor (1 ') for the high-voltage DC connection of offshore wind farms, comprising at least one component combination with a - First component (1, 11), comprising a steel material and - A second component (2, 6, 13), comprising elemental copper, wherein the first (1, 11) and the second component (2, 6, 13) are positively connected with each other. Ribbon conductor (1 ') to Claim 1 comprising a plastic insulation (3, 8, 14), preferably comprising Teflon, with a wall thickness of the plastic insulation (3, 8, 14) in the range between 0.5 cm - 2 cm, preferably in the range of 1.0 cm, such in that the plastic insulation (3, 8, 14) has a dielectric strength of at least 200 kV with respect to the surrounding salt water at ground potential and additionally comprises a protective insulation layer (4, 9, 15). Energy transmission system (1 ") comprising at least two ribbon conductors (1 ') after Claim 1 or 2 , Method for laying a power transmission system (1 ") comprising at least two ribbon conductors (1 ') Claim 1 or 2 comprising at least the following steps: - Provision of two ribbon conductors (1 '), molding of the ribbon conductors such that the second component (2, 6, 13) on the ends (E ₁ , E ₂ ) of the ribbon conductor (1') is removed , Tongues (Z ₁ , Z ₂ ) and a cavity (7) are formed, - connecting the tongues (Z ₁ , Z ₂ ) by means of a weld seam (5), - providing a mold (10), in which the cavity (7 ) is poured out with addition of flux with copper, - removal of the mold (10), - application of a plastic insulation (3, 8, 14) between the planes (I ₁ , I ₂ ), which is generated from a powder and - application of a protective layer ( 4), (9), (15) on the plastic insulation (3, 8, 14).

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