WO2019101275A1

WO2019101275A1 - Device and method for electrically connecting electric cables for direct current

Info

Publication number: WO2019101275A1
Application number: PCT/DE2018/200108
Authority: WO
Inventors: Faruk YEGINSOY; Wolfgang Kessler
Original assignee: Leoni Kabel Gmbh
Priority date: 2017-11-27
Filing date: 2018-11-27
Publication date: 2019-05-31
Also published as: DE102017221151A1

Abstract

The invention relates to a device for electrically connecting power cables for direct current comprising a connection terminal.

Description

Device and method for electrical connection of Stromkabein

for direct current

The invention relates to a device and a method for the electrical connection of power cables for direct current, in particular for direct current with high current density.

DC cables are used, for example, as connecting cables for solar systems or as a charging cable for electrically powered vehicles, with high current densities can occur within the cable. These can cause heating of the cables and, consequently, a mostly unwanted increase in the electrical resistance of the cables. The current-related heating at portions of the cable can be particularly strong with an already structurally related increased electrical resistance, for example at connection or connection points. In addition, the undesirable effects of increased electrical resistance and unwanted heating may reinforce each other by first heating portions with increased electrical resistance more than other portions of the cable, and this disproportionate heating in turn further increases the electrical resistance of the corresponding portion. It is therefore desirable in a large number of technical applications that certain sections of the cable, in particular connecting points or connecting points, have no increased electrical resistance compared to the overall cable.

Are known two- or multi-part cable connectors, T-connector for power cables and power distribution devices, which have no or only a slightly increased electrical resistance to the cable to be contacted. Common to the known solutions that they are either to be arranged on one of the cable ends, or that the cable must be made for this at least with already partially prepared connection points. For example, power cables are known, which are manufactured with a plurality of T-junctions for connecting other cables.

However, it is, for example, in the installation of a solar system, which may have a plurality of individual solar panels, technically unfavorable to prefabricate a common main power cable with a plurality of prepared (T) connection points for connecting the individual solar panels. For example, the arrangement and the number of individual solar panels depends on the topography of each Insta- tation is dependent - and thus varies from Instaiiationsort to installation site - such a cable would be available only as an individual production and thus less cost efficient.

Although further solutions are known in which the main power cable with the individual Soiarpanelen by insulation piercing terminals (or other the insulation of the main power cable penetrating sharp-edged contact means) can be electrically contacted, but these are often not suitable for outdoor use and / or little resilient or tensile strength in the event of an unintended force, for example due to environmental influences. Another disadvantage is that the insulation displacement terminals on the one hand only a surface of a current-carrying conductor of the

Main power can be contacted. Since a material discharge from the cable out with a Schneidkiemme is not possible, a more than slight penetration of the insulation displacement conductor in the current-carrying conductor of a cable would affect the mechanical strength, in particular the tensile strength of the cable to a significant extent negative. On the other hand, the necessarily sharp-edged contact means of the insulation displacement contact the current-carrying conductor of a cable only along a narrow ridge. Even an ideal U-shaped insulation displacement terminal, in which a round cable with a corresponding cross-sectional diameter would be completely pressed in, could electrically contact the current-carrying conductor of the cable only along a narrow semicircular arc along the conductor surface. In this case, due to the geometrically limited contact surface, the already described undesired effects of the heating may occur.

Next solutions are known in which the individual soiar panels are individually connected to a power distribution device. In this case, DC cables which have connectors arranged at their respective ends can be used. The main power cable can be connected to the power distribution device. In this case, however, a total of a cable extension and at least one additional device, for example a power distribution device, is required. This increases the costs and reduces the efficiency of a solar system to be installed.

There is therefore the technical problem of providing an improved device and an improved method for the electrical connection of power cables for direct current, in particular with high current density, in order to at least partially overcome the aforementioned disadvantages. In particular, a contacting direction and a contacting method for a Gieichstromkabel be provided, which allow a multiple electrical contacting of the Gieichstromkabels along its geometric extent with a respectively improved eiektrischen resistance and / or a respectively improved mechanical strength of the individual contacts without the cable for this purpose prior to application in a Installation environment must be prefabricated features or Vorrich- ing components.

This technical problem solves a device according to the main claim, and a system according to claim 10 and a method according to claim 13. Advantageous embodiments are defined by the claims 2 to 9, 11, 12 and 14.

A device for electrically connecting power cables for direct current, in particular for direct current with a high current density, has a terminal which is adapted to at least partially surround a power cable. A partial encompassing here means an at least partial embracing a Stro cable along its cross-sectional geometry, so that the terminal in a cross-sectional view, the power cable at least partially reshapes and / or rests against the surface of the power cable.

Further, the device comprises an electrically conductive conductor pin, which penetrates the terminal and is adapted to be partially disposed in a radial recess of the power cable. Penetration of the terminal by the conductor pin here means an extension of the conductor pin from one surface of the terminal to another opposite surface of the terminal. In particular, the conductor pin can penetrate the connection terminal from a surface facing the current to a surface facing away from the current cable. The terminal may have an opening or omission suitable for receiving the conductor pin penetrating the terminal. The opening or omission may have an internal thread and / or the conductor pin may have an external thread, so that the conductor pin can be inserted or screwed rotatably into the connection terminal. The ladder pin can be fixed with an adhesive in the opening or omission of the terminal. The opening or omission can be a hole.

Further, a first connector is disposed on the terminal and electrically connected to the conductor pin. The first connector is to suitable to be electrically conductively connected to a corresponding mating connector. The first connector and the corresponding mating connector may be known standard connectors for electrical connection of power cables. In one embodiment, the first connector and the corresponding mating connector may be implemented as screw-type or screw mating connectors, respectively. The first connector may be releasably or non-detachably connected to the terminal, for example, with an adhesive, a spring-type connector or a screw connection. By merging or connecting the first connector with the corresponding mating connector, an electrically conductive connection between the mating connector and the conductor pin is made.

The conductor pin is adapted to be disposed in the radial recess of the power cable so that at least one extended surface of the conductor pin abuts an electrically conductive portion of the power cable and thereby establishes an electrically conductive connection therewith.

Thus, by merging or connecting the first connector with the corresponding mating connector, an electrically conductive connection between the mating connector and the electrically conductive part of the power cable can be made. The mating connector may in particular be electrically conductively connected to an end portion of a power cable to be connected, so that the merging or connecting the first connector with the corresponding mating connector each electrically connects an electrically conductive part of the encompassed by the terminal power cable and the power cable to be connected.

In a variant, the first connector and the conductor pin may be integrally formed.

The radial recess of the power cable can completely penetrate at least one insulation of the cable. The radial recess may continue to expand into the geometry / cross-sectional geometry of a live conductor of the power cable. The radial recess may be an omission or recess in the surface / lateral surface of the cable, which is directed in particular to the longitudinal axis of the cable. In particular, the radial recess may be a bore, which in particular extends from a lateral surface of the cable to the wick axis of the cable. In another variant, the radial recess can be made by a milling process.

An advantage of the device, for example over known insulation displacement terminals, is that the conductor pin with at least one extended surface bears against an electrical conductor of a power cable and thereby establishes an electrically conductive connection with the electrical conductor. The electrically conductive connection over the extended area has a reduced electrical resistance compared to an electrical contact, which is achieved only over a narrow ridge. In particular, at high current densities undesirable heating of the contact point can be reduced thereby.

A further advantage consists in that the power cable does not have to have connection points, in particular already to be prefabricated during the production of the cable, which are to be manufactured or manufactured before an application of the cable in an installation environment. It is sufficient to deploy the cable in an installation environment, for example at the installation site of a solar system with a large number of solar panels, and then to introduce a radiaic depression into the cable at the respectively required connection points. This can be done, for example, by simply drilling or piercing the cable with a suitable drilling tool / drill. In contrast to devices which, for example, penetrate the insulation of a cable with pointed or sharp-edged contacting means, here a material discharge from the previously made without recess cable is deliberately effected, so that the described recess / omission / bore is formed. The recess / Ausiassung / bore can be made at a point of connection of the cable, but this is not absolutely necessary.

The connecting device with the conductor pin can thus be arranged at almost any point of the cable. The number of connectors on a cable is limited only by the total length of the cable. Insbeson ^¬ particular can be arranged a Mehrzahi / Vieizahl of connecting devices to a gene to be contacted only peo ^¬ cable.

In a variant of the device for connecting power cables for direct current, the conductor pin can be arranged in the radial recess of the power cable so that at least two extended surfaces of the conductor pin on the electrical abut conductive part of the power cable and thereby produce an electrically conductive connection Ver with this.

For this purpose, the radial recess to be introduced into the cable can be manufactured or introduced into the cable such that the recess extends at least partially into the electrically conductive part of the power cable. For example, the radial recess, which may be a bore in particular, may extend to the cross-section center of a circular cross-section conductor. An advantage here is that, for example, a cylindrical contact pin can be arranged in a cylindrical recess / bore in the electrically conductive part of the power cable inside. In this case, the cylindrical contact pin can abut against the electrically conductive part of the power cable both with a cylinder bottom surface and with a cylinder jacket surface and thus produce a much larger electrical contact surface than, for example, an insulation displacement terminal. In particular, since a current flowing through a DC power cable has no skin effect, also the complete contact surface can be effectively used to a transfer of electricity. The terminal may have a first half terminal and a second half terminal. The first half terminal and the second half terminal may be ausgebil det, in cooperation with a Stromkabei substantially voiiständig fen to umgrei. The first and the second half-clamp can be symmetrical to one another or asymmetrical to one another. Furthermore, the first half clamp and the second half clamp can be configured to be locked against one another and / or clamped so that a displaceable movement of the half clamps is hindered against one another and / or the connection clamp is frictionally fixed to the power cable. The first connector can be arranged in particular on the first half terminal.

In one variant, the first half-terminal and the second half-terminal may be connected to each other by a terminal hinge, so that the arrangement of the power cable or the at least partially encompassing the power cable can be achieved by a hinge movement of the connected half-terminals.

In another variant, the first and the second half clamp may each have zuei nander corresponding projections or jumps, which for the purpose a non-positive locking of the half-clamps to a current ka at miteinan- under the action of a tensile stress can be brought into contact.

An advantage of a terminal with two half-clamps is that it allows a simple and at the same time loadable arrangement of the device on a cable. The half-clamps can be screwed together in particular for this purpose. Alternatively or additionally, a releasable locking of the half clamps against each other can be done with a locking lever or other mechanical locking device. In particular, the terminal may for this purpose have a Arretierschneliverschiuss, which is adapted to attack in each case suitable locking pins of the first and / or the second half-clamp and to clamp under an exploitation of an elastic material tension, the two half-clamps against each other, so that a displaceable movement of the half-clamps obstructed against each other is.

The connection terminal can produce an overall tight connection of a connection point against environmental influences. In particular, the overall tight closure of the connection point can be produced by such embodiments of the connection terminal, which are designed to completely encompass a power cable.

An advantage here is that components of the device can be protected against corrosion, for example, due to penetration of moisture into the radial recess, without the need for additional devices such as sealing sleeves and / or a housing.

In one development, the conductor pin can be arranged in the radial recess of the power cable so that it completely penetrates the power cable. Furthermore, the conductor pin can penetrate the first half terminal and / or the second half terminal.

The radial recess in the power cable can thereby fully penetrate the power cable in a direction unequal to the length direction or the wick axis of the power cable. In particular, the depression may be a recess or omission which extends from an outer side / outer surface of the cable to the opposite outer side / middle of the cable. The radial recess in the power cable may be a bore in a variant which completely penetrates the cable orthogonal to the length direction or to the wick axis and / or through a cross sectional center ^¬ through or pierced. An advantage here is that the contact surface between the conductor pin and the electrically conductive part of the cable can be further increased. In addition, in each case one connector can be arranged on two mutually opposite half terminals, so that two mating connectors can be arranged with only one depression in the cable and only one connection terminal.

In a variant, the conductor pin may have the shape of a prism with a polygonal cross section.

An advantage here is that a conductor pin in the form of a prism having a polygonal cross-section has a plurality of lateral surfaces, which can be contacted with the electrically conductive part of a cable. In addition, a conductor pin in the form of a prism, which is positioned in a correspondingly shaped recess of a cable, be secured against rotation about its longitudinal axis.

In another variant, the conductor pin may have the shape of a cylinder with a circular or elliptical cross-section or a circular or elliptical base.

An advantage here is that in particular a corresponding recess in the cable can be made easily by a drilling process.

In one embodiment, the conductor pin may have a tapered cylindrical shape or truncated cone shape toward a longitudinal end of the cylinder. In another embodiment, the conductor pin may have at least one substantially circular cylindrical portion and at least one tapered frusto-conical portion.

Further, the device for electrical connection of power cables, a mechanical spring, in particular a plate spring having, which is mechanically connected to the conductor pin. The mechanical spring can, for example, spring steel or a Kunststoffmateria! be made and in particular be arranged between the terminal and the first connector or the terminal and a cable to be encompassed by the terminal. The mechanical spring may be arranged and configured such that it, at least after an arrangement of the device on a power cable, a spring force on the Conductor pin exerted, which is directed from an outer side of the terminal in a direction of geometric extension of the Leitstift to the electrically conductive part of the power cable. In other words, a spring force caused by the mechanical spring presses the conductor pin into the radial recess of the cable.

One advantage here is that, for example, power cables which have conductor materials with a creep behavior / retardation behavior can be improved, in particular more permanently, contacted. For example, a conically tapering (circular) truncated cone-shaped conductor pin (or such a molded part of a conductor pin) can be pressed by a spring / disc spring into a correspondingly shaped radial recess of a power cable with a conductive part made of an aluminum material. A retardation of the aluminum material occurring over a period of time can be compensated for by pressing in the kei-truncated conductor pin. In other words, due to the spring force acting on it, the frusto-conical conductor pin can follow in a radial recess of the power cable that widens due to a material retardation over a period of time. The contact surfaces of the frusto-conical conductor pin and of the conductive part of the power cable thus remain in abutment despite the creeping behavior / retardation behavior of the aluminum material.

In one development, the conductor pin can have an external thread at least along part of its geometric extension, which is suitable in particular for being rotatably joined with a corresponding internal thread in the, in particular cylindrical, radial depression of the power cable and / or in an opening or omission of the connection terminal become. Alternatively or additionally, the conductor pin can be fixed with a, in particular electrically conductive, adhesive in the radial recess of the power cable.

In particular, the conductor pin may be at least partially formed as a threaded rod with a screw thread. The depression or recess in the cable can be formed completely or partially with an internal thread. The internal thread can be made by a tap into the cable inside. The internal thread can in particular be formed in an insulation and / or in a conductive part of the cable. In addition, an opening or omission of the terminal may have an internal thread. One advantage of this is that the ladder pin can be snatched into the box. In this way, a mechanical fixation of the conductor pin on / in the cable can be improved. If the conductor pin screwed into the electrically conductive part of the cable, so the mechanical fixation of the conductor pin on / in the cable improves, at the same time the contact surface between the conductor pin and the electrically conductive part of the cable, for example compared to a cylindrical pin with a smooth Lateral surface, further increased.

In another development, the conductor pin can have a self-tapping external thread at least along part of its geometric extension, which is suitable, in particular, for cutting / screwing an internal thread into the, in particular cylindrical, radial depression of the power cable and / or into an opening or omission of the connection terminal , wherein the cutting / screwing takes place at least partially by a rotational movement of the conductor pin about its longitudinal axis. Alternatively or additionally, the conductor pin can be fixed with a, in particular electrically conductive, adhesive in the radial recess of the power cable.

One advantage of this is that the conductor pin can be screwed into the cable without having to first make an internal thread in the radial recess of the cable. This can also be a mechanical fixation of the conductor pin to / m the cable to be improved. If the conductor pin with the self-tapping thread is screwed into the electrically conductive part of the cable, the mechanical fixation of the conductor pin on / in the cable improves, whereby at the same time the contact surface between the conductor pin and the electrically conductive part of the cable, for example with respect to a cylindrical Contact pin with a smooth surface, continues to increase.

In one variant, the conductor pin is made of a material with a higher electrical conductivity than an electrically conductive part of the Stromkabeis. For example, the conductor pin can be made of copper, while the Stromka ^¬ bel to be connected has an integrally manufactured inner conductor made of aluminum.

Since a, for example, cylindrical conductor pin may have a smaller cross-sectional diameter than the electrically conductive part of the Stromka ^¬ lever to be connected, its electrical conductivity relative to the electrically conductive part of the power cable may be reduced due to the smaller cross-sectional diameter. This geometrically induced relative reduction of the electrical conduction ability can be counteracted by the use of materials with comparatively higher electrical conductivity.

A system of electrically connected DC power cables includes a first power cable having an inner conductor and insulation, the first power cable having a radial recess. Furthermore, the system has a connection terminal, which surrounds the first power cable at least partially in the region of the radial recess, and a conductor pin, which penetrates the connection terminal and is arranged partially in the radial recess. A first connector is in this case arranged on the terminal and electrically connected to the conductor pin. The first connector is adapted to be electrically connected to a corresponding mating connector. Furthermore, at least one extended surface of the conductor pin bears against the inner conductor and establishes an electrically conductive connection with it.

A second power cable may be electrically connected to the system by electrically connecting a countercurrent connector disposed on the second power cable to the first connector.

The radial recess may be a cylindrical bore. Furthermore, the radial recess can expand spatially into the geometry of the inner conductor so that the, in particular cylindrical, conductor pin bears against the inner conductor with at least two extended surfaces, in particular with a cylinder bottom surface and with a cylindrical outer surface.

A method of manufacturing an electrically conductive connection of DC power cables comprises the steps of:

Providing a first power cable with an inner conductor and an insulation,

- Making a radial recess in the power cable, in particular by drilling or milling;

Arranging a connection terminal on the power cable, in particular in the region of the radial recess;

Arranging a conductor pin so that it penetrates the terminal and is at least partially positioned in the radial recess, wherein at least one extended surface of the conductor pin abuts the inner conductor and forms an electrically conductive connection therewith;

- Arranging a first connector on the terminal, so that it is electrically connected to the conductor pin, wherein the first connector Furthermore, it is suitable to be electrically conductively connected to a corresponding mating connector.

The order of the process steps is not defined here. Thus, the depression can be made in the power cable, for example, even after arranging the terminal. For example, a already arranged on the cable / fixed terminal can be pierced with a suitable drilling tool so that the bore thus produced penetrates the terminal and the insulation of the cable and extends into the inner conductor of the cable into Ka.

Other features, characteristics, advantages and possible modifications will become apparent to those skilled in the art from the following description in which reference is made to the accompanying drawings. The figures are to be understood as schematic drawings and not to scale.

Fig. 1 A / B show the contacting of the electrically conductive part of a cable with a cutting clamp.

Fig. 2 A shows the contacting of the electrically conductive part of a cable with a contact pin along an extended surface of the contact pin.

Fig. 2 B shows the contacting of the electrically conductive portion of a cable with a contact pin along two extended surfaces of the con tact pin.

Fig. 3 A / B show a first variant of a device for electrical connec tion of power cables.

Fig. 4 A / B show a second variant of a device for electrical connec tion of power cables.

Fig. 5 A / B show a third variant of a device for the electrical connection of power cables.

1 A / B show in a cross-sectional view (Fig. 1 A) and in a corre sponding side view (Fig. 1 B) a cutting terminal S, as they are for electrical Kon- Taktierung of power cables 100 with an insulation 120 and an electrically conduct the inner conductor 110 is known. The insulation displacement terminal S has a sharp-edged contact element K.

For contacting the inner conductor 110 of the power cable 100, the sharp-edged contact element K is pressed into the insulation 120 of the power cable 100, so that the contact element K penetrates the insulation 120 and applied to the inner conductor 110 of the power cable 100. As shown in the side view, the contact element K contacts the inner conductor 110 of the power cable 100 with the sharp-edged ridge which penetrates the insulation 120. A material discharge from the insulation 120 or the inner conductor 110 does not take place here. Therefore, the contact element K can not or only slightly into the inner conductor 110, which is made in one piece from an aluminum alloy in the example shown, penetrate. Due to the con tact, which is only along the narrow sharp-edged ridge, it can lead to undesirable heating of the contact point, especially in the presence of high current densities.

2 A shows the cross section of a power cable designed as a flat cable with an inner conductor 11Q and an insulation 120. Further, the power cable shown in FIG. 2A has a depression 130 which completely penetrates the insulation 120 of the power cable, so that a section of the inner conductor 110 is exposed. The depression 130 shown in cross-section in FIG. 2A has a cylindrical extension, so that a section of the inner conductor 110 which is circular in a plan view is exposed. Such a cylindrical recess can be made, for example, by a drilling method. A corresponding to the cylindrical recess 130 cylindrically shaped contact pin 200 is arranged as shown in Fig. 2 A in the recess 130. The contact pin 200 has a conically tapered end portion with a flat bottom surface which contacts the Innenieiter 110 after placement in the recess 130 surface. In other embodiments, the cylindrical contact pin may not have a tapered end portion. The in Fig. 2 A has over the known device shown in FIGS. 1 A / B the advantage that an electrical contact between a contact center! and an inner conductor 110 is made not only along a narrow ridge, but along an extended bottom surface of the contact pin 200. An electrical resistance of the contact point is thereby reduced and an undesirable heating of the contact point, especially at high current densities occurring reduced. 2 B likewise shows the cross-section of a power cable designed as a flat cable with an inner conductor 110 and an insulation 120. A cylindrical depression 131 penetrates the insulation 120 in the example shown in FIG. 2B and extends into the geometry of FIG Innenieiters 110 into it. In other words, it can be described that the depression 131 completely penetrates the insulation 120 and produces a cylindrical recess from the inner conductor 110. Cor responding to Fig. 2 A, a cylindrical conductor pin 200 can be arranged in the recess 131. In the example shown in FIG. 2 B, the cylindrical contact pin 200 positioned in the recess 131 bears against the inner conductor 110 with a cylinder bottom surface. Furthermore, in the example shown in FIG. 2B, the contact pin 200 additionally rests against the inner conductor 110 with its cylinder jacket surface, so that an electrical contact between the inner conductor 110 and the contact pin 200 is produced both via the cylinder bottom surface and over the cylinder jacket surface.

In other exemplary embodiments prism-shaped contact pins with polygonal cross-sections or bottom surfaces, as well as correspondingly formed Vertie tests can be applied. The prism-shaped contact pins with the polygonal base surfaces can adjoin the inner conductor with a metric number of side surfaces and / or a bottom surface.

3 A / B show a device 1001 for the electrical connection of power cables for direct current. 3 A / B show both a cross-sectional view (FIG. 3A) and a corresponding side view (FIG. 3 B) of the device 1001, which is in each case arranged on a direct current power cable 100 designed as a round cable. The power cable 100 in this case has a one-piece inner conductor 110 made of an aluminum alloy and an insulation 120th

The device 1001 shown for electrical connection of power cables comprises a terminal, which has a first half-terminal 310 and a second half-terminal 320. The first and the second half-clamp 310, 320 in this case surround the round cable 100, wherein the geometries in the half-clamps 310, 320 are respectively adapted to the geometry of the cable 100 to be encompassed. In other embodiments, the geometries of the half-clamps can each be adapted to other cable geometries, for example the cross-sectional geometry of the flat cables shown in FIGS. 2A and 2B.

The first and the second half-clamp 310, 320 have for engaging around the Rundka lever 100 each have a semicircular recess on its inside, so they almost completely reshape the power cable .1.00. The first half-clamp 310 also has a cylindrical shaped passage, which is suitable for receiving a contact pin.

Next, the terminal on a locking device. The first half clamp 310 has on each of two opposite sides a locking lever! The locking levers 311 are pivotally attached to the first half-clamp 310 and are adapted to cooperate with the engagements 312 of the second half-clamp 320 so that the first and second clamps 311 and the second half-clamp 320 have a corresponding engagement 312 on each of two opposite sides Half terminal with each other and / or by an elastic material tension are locked to each other. The terminal can thereby be pressed against the round cable 100 and fixed to this.

The cylindrical contact pin 200 shown in FIGS. 3 A / B penetrates the first half terminal 310 completely from an outer side of the half terminal 310 facing away from the round cable 100 toward an inner side of the half terminal 310 facing the round cable 100. In other words, the contact pin 200 forms an electrical conductive connection from a surface of the first half-terminal 310 to a second surface of the first half-terminal 310 opposite the first surface. Further, the contact pin 200 in a recess of the cable 100, which is covered by the first and the second half-clamp, arranged so that both the lateral surface of the contact pin 200 and the bottom surface each make an electrical contact surface with the inner conductor 110. In the example shown in Figs. 3 A / B example, a cylindrical bore (no Bezugszei ^¬ chen) from the outside of the cable 100 extends to the cross-sectional center point of the in ^¬ nenleiters 110. The bore is in the in the Fig. 3 A / B completely filled with the conductor pin 200.

On the outside of the round cable 100 facing outside of the first half-terminal 310, a standard connector 400 is arranged. The standard connector 400 is designed to be electrically conductively connected to a corresponding mating connector (not shown). The mating connector may in this case be connected in an electrically conductive manner in particular to the line end of a power cable to be contacted. The standard connector 400 is fixed in the example shown in FIGS. 3 A / B on the outside of the first half-terminal 310 and electrically conductively connected to the contact pin 200, so that an electrically conductive connection between the terminals of the standard connector 400 and the Inner conductor 110 of the cable 100 is made via the contact pin 200. The cylindrical contact pin 200 is in this case made in one piece from copper, which has a higher material-specific electrical conductivity than the one-piece made of an aluminum alloy inner conductor 110th

The standard connector 400 is shown only schematically in the example shown. It is expressly understood, however, that the standard connector 400 may be a commercially available and / or standard connector for transmitting electrical power, particularly direct current. Also special, custom-made for a specific purpose connector, are possible in other embodiments of the device.

The standard connector 400 shown in FIGS. 3 A / B can be embodied both as a "male" connector with outwardly pointing contact pins and as a "female" connector with inwardly pointing contact openings.

Weitei the connector 400 may be suitable to produce with the corresponding mating connector (not shown) a positive connection and / or fixed by a spring force releasably releasably secured to the corresponding mating connector (contact foot) and / or by screwing with the corresponding mating connector in addition to a inadvertent lots to be secured.

FIGS. 4 A / B show a device 1002 for the electrical connection of power cables for direct current. The device components provided with reference numerals of the device 1002 shown in FIGS. 4A / A correspond to those of the device 1001 shown in FIGS. 3A / A, unless they are described below as being different. For the description of these features, therefore, unless expressly described below as being different from the foregoing, reference is made to the preceding

Description of the Fig, 3 Ä / B referenced.

The device 1002 shown in FIGS. 4 A / B differs from the device 1001 shown in FIGS. 3 A / B by the differently configured contact pin 210. The contact pin 210 has an external thread 211. The external thread 211 is arranged in the embodiment shown in FIGS. 4 A / B along part of the longitudinal extent of the contact pin 210. More specifically, the external thread 211 extends along that part of the lateral surface of the cylindrical contact pin 210, which is located on the inner conductor 110 of the cable 100 at. The correct In the region of the inner conductor 110, a recess of the circular blade 100 formed to correspond to the contact pin 210 has an internal thread corresponding to the external thread 211 (without reference numeral). The contact pin 210 is screwed into the inner conductor 110 of the Rundkabeis 100. The contact pin 210 is thus mechanically fixed directly to the inner conductor 110 and contacted with this electrically.

FIGS. 5 A / B show a device 1003 for the electrical connection of power cables for direct current. The constituent parts of the device 1003 shown in Figs. 5A / A correspond to those of the device 1001 shown in Figs. 3A / A, unless described below as being different. For the description of these features, therefore, unless expressly described below as being different from the foregoing, reference is made to the preceding

Description of Fig. 3 A / B referenced.

The device 1003 shown in FIGS. 5 A / B differs from the device 1001 shown in FIGS. 3 A / B by the differently configured contact pin 220, the associated recess 221 and the telier spring 500. The contact pin 220 is a first Part circular cylindrical shaped and formed frustoconical to a second part. The frusto-conical part of the contact pin 220 is arranged in a correspondingly shaped recess 221 of the cable 100 such that the conical surface of the contact pin 220 produces an electrical contact surface with the inner conductor 110.

The schematically illustrated plate spring 500 is arranged in the device 1003 in the region of the connector 400: which is mechanically fixedly connected to the connection terminal in the device example shown. Further, the telier spring 500 is mechanically connected to the contact pin 220 so that the Telier spring 500 exerts a permanent force F in the direction of the cable 100 on the contact pin 220.

If the depression 221 shown in FIGS. 5 A / B widens in the region of the inner conductor 110 made of an aluminum material due to a retardation, then the force F transferred from the plate spring 500 to the contact pin 220 causes the depression Contact pin 220 further inserted into the cross-sectional geometry of the cable 100 is inserted / pressed. The partially frusto-conical shape of the contact pin 220 ensures that the lateral surface of the frusto-conical portion of the contact pin 220 remains in abutment despite the retardation of the aluminum material with the inner conductor 110.

FIGS. 6 A / B show a device 1004 for the electrical connection of power cables for direct current. The device components provided with reference numerals of the device 1004 shown in FIGS. 6A / B correspond to those of the device 1001 shown in FIGS. 3A / 2B, unless they are described below as being different. For the description of these features, therefore, unless expressly described below as being different from the foregoing, reference is made to the preceding

Description of Fig. 3 A / B referenced.

FIGS. 6A / B show a cylindrical contact pin 230 which completely penetrates the cable 100. The contact pin 230 shown penetrates the round cable 100 radially, wherein the associated cylindrical recess (without reference numeral) passes through the cross-section center point of the cable 100 therethrough. The contact pin 230 contacts the inner conductor 110 of the cable 100 along a part of its lateral surface.

Further, the contact pin 230 fully penetrates both the first half terminal 310 and the second half terminal 320 from a first surface to a second opposing surface of the half terminal, respectively.

The illustrated device 1004 has a first standard connector 400 disposed on the first half terminal 310 and a second standard connector 410 disposed on the second half terminal 320. Both the first and second standard connectors 400, 410 are electrically connected to the contact pin 230. The first and the second standard connector 400, 410 may be designed differently from each other in a variant.

The device 1004 shown in FIGS. 6A / B thus enables an electrically conductive connection of the inner conductor 110 of the cable 100 with two mating connectors (not shown) which correspond to the first and the second standard connectors 400, 410, respectively.

Furthermore, FIGS. 6 A / B show a first fastening screw 331 and a second fastening screw 332. For the sake of clarity, the fastening screws 331, 332 are shown schematically only in the cross-sectional view (FIG. 6A). shows. The fastening screws 331, 332 releasably fix the first half-terminal 310 and the second half-terminal 320 to the cable 100.

It should be understood that the exemplary embodiments discussed above are not exhaustive and do not limit the subject matter disclosed herein. In particular, it will be apparent to those skilled in the art that they may arbitrarily combine the described features and / or omit various features without departing from the subject matter disclosed herein.

Claims

Claims 1. A device for electrically connecting power cables for direct current, comprising

a terminal adapted to at least partially surround a power cable;

a conductor pin which penetrates the terminal and is adapted to be partially disposed in a radial recess of the power cable; a first connector disposed on the terminal and electrically connected to the conductor pin; in which

the first connector is adapted to be electrically connected to a corresponding mating connector,

wherein the conductor pin is to be arranged in the radial recess of the power cable such that at least one extended surface of the conductor pin bears against an electrically conductive part of the power cable and thereby establishes an electrically conductive connection therewith.

2. A device according to claim 1, wherein

the conductor pin in the radial recess of the power cable is to be arranged so that at least two extended surfaces of the conductor pin abut against the electrically conductive part of the power cable and thereby establish an electrically conductive connection therewith.

3. A device according to any one of claims 1 or 2, wherein

the terminal has a first half terminal and a second half terminal, and / or

the first half-clamp and the second half-clamp are designed to cooperate in a Stromkabe! essentially completely encompass, and / or

the first half clamp and the second half clamp are designed to be locked against one another and / or clamped, so that a displaceable movement of the half clamps is hindered against one another and / or the connection clamp is fixed non-positively to the power cable, and / or

the first connector is disposed on the first half terminal.

4. A device according to any one of claims i to 3 _; in which

the conductor pin in the radial recess of the power cable is to be arranged so that it completely penetrates the Stromkabei, and / or

the conductor pin penetrates the first half terminal and / or the second half terminal.

5. A device according to claim 4, further comprising

a second connector, which is disposed on the terminal and is electrically conductively connected to the conductor pin, wherein the second connector is further adapted to be electrically conductively connected to a corresponding mating connector, and / or

the second connector is arranged on the second Haibklemme.

6. An apparatus according to any one of claims 1 to 5, wherein

the conductor pin has the shape of a prism with a polygonal cross section, or

at least a portion of the conductor pin has the shape of a cylinder with a circular or elliptical cross-section, and / or

at least a portion of the conductor pin has the shape of a Keuristumpfs with a tapering towards one end of the section circular cross-section.

7. An apparatus according to any one of claims 1 to 6, further comprising

a mechanical spring, in particular a plate spring, which is mechanically connected to the conductor pin, wherein

the mechanical spring is arranged and configured to exert a spring force on the conductor pin, which is directed from an outside of the terminal in the direction of the geometric extension of the guide pin towards the electrically conductive part of the power cable.

8. A device according to any one of claims 1 to 7, wherein

the conductor pin has an external thread, at least along part of its geometric extension, which is in particular suitable for being rotatably joined with a corresponding internal thread in the radial recess of the power cable, or

the conductor pin has a self-tapping external thread at least along part of its geometric extension.

9. A device according to any one of claims 1 to 8, wherein

the conductor pin is made of a material having a higher electrical conductivity than an electrically conductive part of the power cable.

10. A system of electrically connected power cables for direct current

a first power cable having an inner conductor and an insulation, the first power cable having a radial recess,

a connection terminal, which surrounds the first power cable at least partially in the region of the radial recess,

a conductor pin which penetrates the terminal and is partially disposed in the radial recess;

a first connector disposed on the terminal and electrically connected to the conductor pin; in which

the first connector is adapted to be electrically connected to a corresponding mating connector;

wherein at least one extended surface of the conductor pin abuts against the inner conductor and establishes an electrically conductive connection therewith.

11. A system according to claim 10, further comprising

at least a second power cable with a mating connector, which is electrically connected to the first connector.

12. A system according to any one of claims 10 or 11, wherein

the radial recess is a cylindrical bore, and / or

the radial channeling expands spatially into the geometry of the inner conductor, so that the, in particular cylindrical, conductor pin bears against the inner conductor with at least two extended surfaces, in particular with a cylinder bottom surface and with a cylinder jacket surface,

13. A method of making an electrically conductive connection of DC power cables comprises the steps of:

- Providing a first power cable with an inner conductor and an insulation;

- Producing a radial recess in the Stromkabei;

- placing a terminal on the power cable in the region of the radial recess;

Arranging a conductor pin so that it penetrates the terminal and is at least partially positioned in the radial recess, wherein at least one extended surface of the conductor pin rests against the inner conductor and makes an electrically conductive connection therewith;

- Arranging a first connector to the terminal, so that it is electrically connected to the conductor pin, wherein the first connector is further adapted to be electrically connected to a corresponding mating connector.

14. A method according to claim 13, wherein

the production of the radial recess pushed by drilling or milling.