EP3026757B1 - Verbindungselement zum Kontaktieren einer Abschirmung eines Stromkabels - Google Patents

Verbindungselement zum Kontaktieren einer Abschirmung eines Stromkabels Download PDF

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Publication number
EP3026757B1
EP3026757B1 EP14195222.6A EP14195222A EP3026757B1 EP 3026757 B1 EP3026757 B1 EP 3026757B1 EP 14195222 A EP14195222 A EP 14195222A EP 3026757 B1 EP3026757 B1 EP 3026757B1
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EP
European Patent Office
Prior art keywords
contact
cable
connecting element
element according
lead
Prior art date
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EP14195222.6A
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English (en)
French (fr)
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EP3026757A1 (de
Inventor
Thilo Simonsohn
Christian Heindl
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Tyco Electronics Raychem GmbH
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Tyco Electronics Raychem GmbH
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Priority to EP14195222.6A priority Critical patent/EP3026757B1/de
Publication of EP3026757A1 publication Critical patent/EP3026757A1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/26—Connections in which at least one of the connecting parts has projections which bite into or engage the other connecting part in order to improve the contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding  
    • H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
    • H01R13/6591—Specific features or arrangements of connection of shield to conductive members
    • H01R13/6592—Specific features or arrangements of connection of shield to conductive members the conductive member being a shielded cable

Definitions

  • the present invention relates to a connecting element which is used for contacting an electrically conductive shield, in particular a shielding layer or a plurality of shielding wires of a cable, for either connecting same to the conductive shield of another cable or directly to ground.
  • Cable installations for the transmission of bulk power are often made with single-core cables with metal sheaths or other forms of earth-return conductors, which are usually covered with an electrically insulating oversheath (or jacket), in most cases of plastics material, both to avoid uncontrolled earthing (grounding) and to protect the conductor from corrosion.
  • a cable shield the metallic barrier that surrounds the cable insulation, holds the outside of the cable at or near ground potential. It also provides a path for return current and for fault current. The shield also protects the cable from lightning strikes and from current from other fault sources.
  • the metallic shield is also called the sheath.
  • Medium voltage (MV, voltages above 1000 volts and below 69000 volts) power cables normally have copper wire shields, in some cases also aluminum wire shields. Alternatively, power cables often also have a copper tape shield or an aluminum tape shield. These are wrapped helically around the cable with some overlap. In the tape shield cable, the shield is not normally expected to carry unbalanced load current. There is an advantage in having a higher resistance shield: the cable ampacity can be higher because there is less circulating current.
  • the ground-potential metallic shield is an important element because it serves to protect both the cable itself and the power system to which the cable is connected. It protects the cable itself by confining the cable's dielectric field, and by providing symmetrical radial distribution of voltage stress. This limits the stress concentration at any one insulation point. It also helps dissipate heat away from the current-carrying conductor.
  • the metallic shield can also protect the power system by conducting any fault current to the ground. Moreover, the metallic shield reduces interference with electronic equipment and also reduces the hazards of shock to anyone working with the cable.
  • cable shields are well connected to each other, e. g. at cable joints, and in some cases that the connection of the metallic shield to a defined grounding point is established with sufficiently high electrical and mechanical performance.
  • this metal sheet has to be of a certain thickness, usually around 500 ⁇ m when using copper or copper alloys as the metal.
  • 50 or more such protrusions are provided, resulting in a size of the contact element of e. g. 60 mm x 30 mm. From this thickness and size results a rather high rigidity of the contact element, so that the contact element tends to give way outwardly when mounted on a cable. While this is no problem for arrangements where the contact element is located beneath the cable shield and where the protrusions are provided on the outer surface of the contact element, the rigidity leads to a deteriorated electrical contact for arrangements in which the contact element encompasses the cable shield. For many applications, however, and in particular for tape shields, it is desirable to mount the connecting element from the outside with or without having to fold back the cable shield.
  • an electrical connector for cables is provided, the cables being of the type having a first conductor, a second conductor surrounding said first conductor, and insulation means supporting said first conductor in spaced relation to said second conductor interiorly thereof.
  • the electrical connector comprises in combination: an anchor assembly adapted to be affixed over the cable adjacent an end thereof, including an anchor sleeve, a radially compressible bushing overlying and housing said sleeve and having an exterior tapered surface, a compression member having an interior tapered surface mating with and overlying said bushing surface, and means for drawing said surfaces toward each other to compress said bushing and thereby radially compress said sleeve.
  • the sleeve has a plurality of perforations providing a plurality of inwardly extending hollow projections having completely circumambient wall portions adapted to be embedded in said second conductor on compression of said sleeve over said cable, said bushing having an inner surface overlying and capping said perforations.
  • An electrical contact assembly is carried by said anchor means including an annular internal shoulder adapted to abut and make electrical contact with the end of said second conductor, and second contact means are adapted to make electrical contact with said first conductor, said two contact means being further formed to provide electrical contact with an electrical device, whereby said two contact means may provide an electrical connection between an end of said cable and said device.
  • US 2,250,280 A relates to electrical bonds and particularly to electrical bonds for use in aircraft construction.
  • Document D2 provides a thin, flat strip of a non-corrosive metal, having one or more protrusions on each of one or more of its largest sides, said protrusions being adapted to pierce in a shallow manner the protective coatings and contact the parent metals, thereby insuring electrical bonding without damaging the metals bonded together.
  • a device for interposition between two pieces of metal at a joint thereof for electrically bonding said metals comprises a very thin flat member that will permit a close tight joint between said metals, said member having shallow ridged protrusions extending therefrom, said protrusions being adapted to penetrate said joined pieces.
  • Each of said protrusions is in the form of a ridge which is continuous upon itself, and encloses an area of the metal of one of said pieces, the perimeter of the ridge of each protrusion being of substantially even and predetermined height.
  • FR 2 271 688 A1 discloses an earthing strip for high-voltage cables with plastic dielectrics. It comprises a metal strip with a flexible connection braid riveted to one end. The strip is stamped so that flexible contacts are formed at regular intervals along its length, their shape provides self cleaning and heat dispersion properties. The outer covering of the cable is stripped away to expose the outer foil screen. The strip is wrapped around the screen and can be secured by a plastic tube that shrinks after heating or by other mechanical means. This provides an earth connection that reduces insulation creep away from the point of contact and thus reduces the risk of eventual ionisation and deterioration.
  • FR 2 387 540 A1 relates to sub-screen connections for bonding power cable joints.
  • Conductive screens of e. g. aluminum around cables insulated by thermoplastic or rubber sheathing are linked by contact with a perforated metal strip, inserted between the screen and the insulation after parting the screen/insulation interface with a suitable hot tool.
  • the crests of the perforations penetrate into the underside of the screen to ensure good contact for electrical bonding.
  • the elasticity of the insulation maintains contact pressure between the screen and the link strip.
  • the joint may be bound using a stocking of polychloroprene threads, binding of stainless steel wire or a heat shrunk sheath. This concept is intended for joints or terminals on underground cables carrying several kilovolts with aluminum screening approx. 0.1-mm. thick.
  • FIGs 11 and 12 show an example of a connecting element which is mounted on a cable so that it encompasses the cable shielding from the outside as disclosed in the published international application WO 2014/072258 A1 .
  • the connecting element comprises a contact element 702 which is connected in a connection region 706 to an electrically conductive connecting lead 704.
  • a roll spring 708 is provided for fixing the contact element 702 over cable shielding (not shown in the figures).
  • the inner surface of the contact element 702 is provided with protruding sharp edges 703 which grip the cable shielding in the mounted state.
  • the contact element 702 has to be made from a comparatively thick copper or copper alloy sheet.
  • the contact element 702 is more rigid than would be desirable for a satisfactory electrical contact to the underlying cable shielding.
  • the object underlying the present invention is to provide an improved connecting element for contacting the shielding layer of a power cable, which can be mounted easily as a wrap around, i. e. after the cable connection is assembled, may be adapted to a wide range of cable diameters with little forces, so that it can be installed manually, has a low spring effect, so that the connecting element essentially maintains its dimensions and geometry when being folded around the cable shield, and ensures a robust and reliable electrical contact between a grounding point or an attached lead and the shielding.
  • the present invention is based on the idea that by dividing an electrically conductive contact element for electrically contacting the shielding layer into at least two contact segments which are interconnected by means of at least one hinge element, a much more flexible structure can be achieved. Furthermore, a reduced mechanical force is necessary for bending the contact element around the cable.
  • the hinge element on the one hand provides a region with high flexibility for reducing the rigidity of the contact element. On the other hand, it may provide a circumferential current path from one contact segment to the other.
  • the contact segments are formed from an electrically conductive material, preferably a metal like copper, or a copper alloy.
  • the at least one interconnecting hinge element may be formed from the same material or from a different material. Moreover, the at least one interconnecting hinge element may be formed integrally or as at least one separate element.
  • the contact segments and the hinge elements are formed integrally from one metal sheet.
  • the contact element may also be fabricated from an electrically insulating foil carrying separate contact segments, wherein the hinge element is formed by the insulating foil.
  • Other forms of connections or latches may of course also be used to interconnect the contact segments.
  • it is advantageous to use an electrically conductive material for the hinge element because current can flow from one segment to another. Such an arrangement may also be more cost effective to manufacture.
  • the electrical and mechanical contact between the contact segments and the underlying shielding layer of the cable can be improved by providing at least one contact protrusion which in a mounted state protrudes inwardly towards the shielding layer of the cable.
  • Such protrusions grip the shielding layer and may even puncture the surface of the shielding layer in order to overcome contact deterioration due to oxide or contamination layers.
  • the at least one contact protrusion is formed by stamped and bent cutouts which thereby form sharp teeth that grip the cable shielding layer in a mounted state.
  • sharp elongated contact blades can be arranged on the contact element in order to improve the electrical contact towards the cable shielding.
  • an electrically conductive connecting lead is provided.
  • the connecting lead comprises a metal braiding.
  • a metal braiding has the advantage that it is highly flexible, has a low ohmic resistance, and can be compressed to fit into tight spaces if necessary.
  • metal braidings can be connected to the contact element by most of the commonly used electrical contacting techniques. These kinds of braids are standard low cost products.
  • the connecting lead may be connected to the contact element by at least one solder connection, at least one crimp connection, at least one welded connection and/or at least one riveted connection.
  • a welded connection is used to attach a metal braiding to a copper contact element.
  • the connecting lead may also be connected to the contact element by means of a press-on connection that is only assembled when mounting the connecting element on the cable shield.
  • the connecting lead is electrically connected to each of the contact segments. This can firstly be achieved by aligning contact points along the length of a part of the connecting lead. Preferably, these contact points are arranged to be equidistant along this part of the connecting lead.
  • the connecting lead can also comprise a plurality of fanned out terminal elements. Each of these terminal elements can be connected to one of said contact segments. This arrangement has the advantage that the connecting lead extends in a direction along the cable and can be arranged under a cover sheath more easily.
  • the contact element is fabricated from a stamped metal sheet, wherein clearances define the contact segments and the at least one hinge element. These clearances may be stamped, but can also be laser cut, water jet cut, or fabricated by any other suitable fabrication technique. For being mounted around the cable, the contact element is bent to fit around the shielding layer.
  • the fabrication of the contact element as one integral part has the advantage of being cost effective, while maintaining sufficient flexibility of the contact element and thus ensuring a reliable electrical contact.
  • a particularly simple outline can be realized when fabricating the contact element with a rectangular outline and bending it to form at least a part of a cylindrical sleeve around the cable in the assembled state.
  • the bending of the contact element can at least partly be effected already in the factory.
  • a suitable material treatment can be employed, such as applying heat.
  • the contact element preferably does not overlap with itself when being mounted on the cable. Consequently, its dimensions are usually adapted to fit around the cable with the smallest diameter. For cables with larger diameters an increasing fraction of the cable shielding's circumference remains where the contact element is not touching the cable shielding. For an optimized contacting, however, it is desirable to cover the circumference of the cable shielding to the largest possible extent with the contact element. Consequently, according to an advantageous embodiment, extension segments are provided at peripheral regions of the contact element which enhance the part of the cable circumference which is covered by the contact element, but do not overlap with the respective opposing peripheral part of the contact element in the mounted state.
  • an additional clamping element can be provided which presses the contact element onto the cable.
  • the clamping element comprises at least one worm drive clip, cable tie, and/or recoverable sleeve.
  • the recoverable sleeve may be a heat shrink sleeve or an elastic cold shrink sleeve, or a combination of both.
  • the hinge elements are only provided in the particular region that is pressed onto the shielding layer, whereas in a region where the connecting lead is attached to the contact element, the contact segments are not interconnected by hinge elements, thereby having an increased radial flexibility to compensate for the connecting lead, for bulky solder bumps or other irregularities due to the attachment of the connecting lead.
  • the connecting lead may be formed prior to or after connecting the same to the contact element.
  • These deformations may be undulations which lead to an increased circumferential length when bent around the smallest cable.
  • undulations or any other shape should not hinder the installation on any size of cable.
  • Figure 1 shows a plan view of a contact element 102 which is part of a connecting element 100 according to the present invention.
  • the contact element 102 is divided into a plurality of contact segments 106 that are each interconnected by hinge elements 108.
  • the contact element 102 is formed from a cut and punched metal sheet.
  • the hinge elements 108 are fabricated by providing a plurality of narrow and elongated clearances 110.
  • the planar metal sheet is bent to have hollow cylindrical shape or C-shape which encompasses the cable.
  • Each of the contact segments 106 has a length L which extends along a longitudinal axis of the cable and a width W extending along the circumference of the cable.
  • the contact element 102 is much more flexible than a solid metal sheet as the one shown in figure 11 . Nevertheless, the same alloy and sheet thickness and size can be used, thus ensuring a sufficient ampacity and allowing for the fabrication of protrusions for contacting the cable shielding. For instance, copper alloy sheets with a thickness of about 500 ⁇ m can be used.
  • the contact element 102 is fabricated from a rectangular metal sheet with a width of around 66 mm and a length L of about 50 mm.
  • Each of the nine contact segments 106 has a width W of 6 mm.
  • the clearances 110 have dimensions of 1.5 mm around the circumference and 12 mm in the longitudinal direction.
  • hinge elements 108 are formed, which extend in a circumferential direction approximately 1.5 mm and in the longitudinal direction approximately 1.0 mm.
  • the contact element 102 comprises a connecting region 112 which is adapted to be connected to a connecting lead 104.
  • elongated cut-outs 114 separate the contact segments 106 in the connecting region 112. These elongated cut-outs 114 may for instance have a length of 25 mm.
  • the contact element 102 may comprise an arrangement of protrusions similar to the one shown in figures 5 and 6 .
  • a contact region 116 seven protrusions may be arranged on each contact segment 106.
  • the contact region 116 is the particular region of the contact element 102 which is in direct contact with the cable shielding and exerts a contact pressure onto the cable shielding.
  • the contact region 116 has a length of about 35 mm in this particular example. It is clear for a person skilled in the art that all given dimensions are only exemplary values which of course may vary significantly.
  • a connecting lead 104 comprising a metal braiding or the like can be attached by a press fit with roll springs, ties, heat shrink sleeves, worm drive clips or the like.
  • the connecting lead 104 may also be attached by means of welding, soldering, or riveting when fabricating the connecting element 100.
  • a solid metal sheet may be provided with the clearances 110 and the cut-outs 114 by means of appropriate processing techniques, such as punching, water jet cutting, or laser cutting.
  • the thickness of the hinge elements 108 may also differ from the thickness of the contact segments 106. This may be achieved by deforming the metal blank by pressing with high forces using an appropriate blade tool. Bonding individual stripes forming the contact segments onto plastic film or a thinner metal blank is another option.
  • the orientation of the contact segments 106 is essentially parallel to the longitudinal axis of the cable.
  • the shape of the contact segments 106 is preferably rectangular, but may of course have any other arbitrary shape. Within one and the same contact element 102, the contact segments 106 are either identical or contact segments 106 with different shapes can be combined.
  • the connecting element 100 for connecting the connecting element 100 to a grounding point or to another cable shielding, the connecting element 100 further comprises an electrically conductive connecting lead 104.
  • the connecting lead 104 comprises a metal braiding.
  • a metal braiding may for instance be a tubular sleeve made from stainless steel or from tinned copper.
  • all other suitable forms of the connecting lead 104 may also be combined with the contact element 102 according to the present invention, such as cables or flat band conductors.
  • a plurality of terminal leads 120 fan out from a common main lead 118. With their peripheral ends these terminal leads 120 are connected to the contact segments 106 of the contact element 102 in the connecting region 112. In the shown embodiment one terminal lead 120 is connected to one contact segment 106 each.
  • any other suitable distribution of the connection points 122 can also be used according to the present invention. For instance, it may be sufficient for particular applications to contact only every second or third contact segment 106.
  • connection between the contact element 102 and the connection lead 104 can be established while assembling the connecting element at the cable by means of clamping devices such as a roll spring, a cable tie or a heat shrink or cold shrink recoverable sleeve. In most cases, it is, however, advantageous to pre-assemble the complete connecting element 100 in the factory.
  • terminal leads 120 are connected to the connecting regions 112 of the contact segments 106 using well-established contacting techniques, such as welding, soldering, crimping, or riveting.
  • connection of the connection lead 104 can also be located in the contact region 116.
  • the contact element 102 dispenses with a separate connecting zone 112.
  • the arrangement shown in figure 2 has the advantage that the main lead 118 of the connecting lead 104 leads away from the connecting region 112 in a straight manner and in line with the longitudinal axis of the cable. Hence, no sharp bending of the lead 104 is necessary which could be a problem for any sleeves covering the connecting element 100.
  • separating the main lead 118 into a plurality of terminal leads 120 represents an additional fabrication step.
  • the metal braiding 104 is oriented across the longitudinal axis and is connected to said contact segments 106 at a plurality of connecting points 122 which are aligned along a part of the length of said metal braiding 104.
  • the metal braiding 104 usually is flexible enough to be bent to the lead over the jointing area to the shield connection on the opposite side.
  • connection points 122 may be arranged on each contact segment 106 to be aligned equidistantly as shown in figure 3 . Alternatively, also a smaller number of connection points or even only one single connection point 122 may be provided.
  • the metal braiding 104 can be rolled flat and/or compacted before being connected to the contact element 102. Moreover, according to an advantageous embodiment, a welding of the metal braiding 104 onto the contact element 102 is only performed after bending the initially flat contact element 102 at least partially into its final cylindrical or C-shaped form.
  • the contact element 102 may not overlap itself when being mounted on the cable, there always remains a region not covered by the contact element for all cables with a larger diameter than the smallest rated one.
  • the outline of the contact element 102 may have extension segments 124 that are preferably not extending along the complete length in the longitudinal direction of the cable.
  • the contact element 102 according to the embodiment shown in figure 4 allows a larger length of the cable circumference to be electrically contacted by the connecting element 100.
  • each of the width dimensions D1 and D2 has to satisfy the condition D 1 , D 2 ⁇ ⁇ ⁇ d , wherein d denotes the diameter of the smallest cable shield to which the connecting element is mounted.
  • the overall width D is larger than D1 or D2, and therefore an improved electrical contact also for thicker cables can be achieved.
  • extension segments 124 that are not directly connected to the connecting region 112
  • significant current flow may occur through the hinge elements to neighboring contact segments 106. Consequently, the geometry of the hinge elements must be optimized in a way that, on the one hand, a sufficient flexibility can be ensured and, on the other hand, a sufficient ampacity is maintained.
  • Figure 5 shows in a perspective view of a further advantageous embodiment of the contact element 102.
  • two extension segments 124 are arranged in the contact region 116.
  • This enlarged covered circumference improves the overall electrical performance of the connecting element 100.
  • figure 5 also shows schematically an example of the protrusions 126 which are formed at the surface 128 coming into contact with the cable shielding in the mounted state.
  • the protrusions have a crown shaped outline with a plurality of sharp teeth.
  • any other suitable geometry of such a gripping protrusion 126 may also be used.
  • the protrusions 126 are generated by punching through the metal sheet that forms the contact element 102.
  • Figure 6 shows still another advantageous embodiment of the contact element 102 according to the present invention.
  • the fraction of the circumference of the cable which is covered by the connecting region of the contact element 102 is less than the area that is covered by an extended part of the contact region 116.
  • This embodiment has the advantage, that the connecting region 112 which is bulky by carrying the connection points to the connecting lead 104 is reduced in its size (width) and thus fits more easily under a cover sleeve and is easier to bond.
  • the overall number of welding points is reduced for this embodiment compared to the number of contact segments 106 and extension segments 124.
  • the number of contact segments 106 has to be at least the certain minimum required to transmit the current from all the protrusions 126 through the contact segments 106 having a distinct cross-section to the lead 104. This means that only the minimum number of welding points of the connecting lead 104 is being designed into the product. Furthermore, by providing extension segments 124, the circumference of the shielding layer of the cable is covered to the best possible extent.
  • Crown shaped protrusions 126 are provided in order to enhance the mechanical and electrical performance of the contact between the contact element 102 and the cable shielding.
  • this overall length L should be kept as short as possible.
  • the connecting element 100 can also be formed in a way that the connecting lead 104 is attached to the contact element 102 directly in the contact region 116.
  • a separate connecting region 112 is dispensed with.
  • the connecting lead 104 is formed by a metal braiding that is connected to the contact element at a plurality of welding spots which form the connection points 122.
  • the welding spots are arranged between the locations of the protrusions 126.
  • the metal braiding 104 is arranged to enclose an angle with the circumferential axis 130. Such a diagonal arrangement facilitates leading off the metal braiding 104, at the same time avoiding sharp bends.
  • the metal braiding 104 is arranged essentially in parallel to the circumferential axis 130 of the contact element 102.
  • Fig. 8 shows a schematic sectional view of fig. 7 .
  • the metal braiding 104 comprises an undulated cross-sectional shape which facilitates the bending around the cable as indicated by the arrows 132.
  • the stretched length of the undulations corresponds to the circumferential length the connecting lead 104 takes when the contact element 102 is wound around the smallest rated cable.
  • the connecting lead 104 is undulated prior to being welded or otherwise connected on to the contact segments 106.
  • any other suitable cross-sectional shape that provides such a bellow function can also be used in this example.
  • Figures 9 and 10 show a further example using an undulated connecting lead 104 which is directly connected to that part of the contact element that is provided with the protrusions 126.
  • the connecting lead 104 is attached to the surface 134 which is opposite to the surface 128 that is directed towards the cable shield.
  • two arms 138 with contacting regions 116 are arranged at a back bone region 136 which extends in a longitudinal direction of the cable.
  • the two arms 138 are arranged at the back bone region 136 in a staggered manner, so that they do not overlap in the assembled state.
  • two separate connecting leads 104 are provided. Each of these connecting leads 104 is welded onto one arm 138 of the contact element 102 directly in the contact region 116.
  • the connecting leads 104 are also provided with an undulated cross-section in the region of the connection points 122.
  • the present invention provides an improved connecting element for contacting the shield of a cable.
  • the preferred type of shielding is tape shielding.
  • wire shields can be contacted.
  • an easy-to-bend contact plate is provided to which a connecting lead can be attached already in the factory or only during the assembly at the cable.

Landscapes

  • Cable Accessories (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Claims (15)

  1. Verbindungs-Element zum Herstellen von Kontakt mit einer Abschirmung eines Stromkabels, wobei das Verbindungs-Element (100) umfasst:
    ein elektrisch leitendes Kontakt-Element (102) zum Herstellen von elektrischem Kontakt mit der Abschirmung,
    wobei das Kontakt-Element (102) eine Vielzahl elektrisch leitender Kontakt-Segmente (106) umfasst, die über wenigstens ein Gelenk-Element (108) miteinander verbunden sind, und wenigstens ein Zwischenraum (110) die Kontakt-Segmente (106) und das wenigstens eine Gelenk-Element (108) abgrenzt,
    dadurch gekennzeichnet, dass das Kontakt-Element (102) einen Kontakt-Bereich (116) aufweist, der in dem installierten Zustand an die Abschirmungs-Schicht des Stromkabels gedrückt wird, sowie einen Verbindungs-Bereich (112) zum Verbinden einer Verbindungs-Zuleitung aufweist, wobei der Verbindungs-Bereich (112) an den Kontakt-Bereich (116) angrenzt und die Gelenk-Elemente (108) nur in dem Kontakt-Bereich (116) angeordnet sind,
    die Kontakt-Segmente (106) in dem Verbindungs-Bereich (112) durch längliche Ausschnitte (115) voneinander getrennt sind.
  2. Verbindungs-Element nach Anspruch 1, wobei das wenigstens eine Gelenk-Element (108) elektrisch leitend ist.
  3. Verbindungs-Element nach Anspruch 1 oder 2, wobei wenigstens eines der Kontakt-Segmente (106) wenigstens einen Kontakt-Vorsprung (126) trägt, der in einem installierten Zustand auf die Abschirmung zu nach innen vorsteht.
  4. Verbindungs-Element nach Anspruch 3, wobei der wenigstens eine Kontakt-Vorsprung (126) durch gestanzte und gebogene Ausschnitte oder durch längliche Kontaktzungen gebildet wird, die sich an einer Fläche (128) des Kontakt-Elementes (102) befinden, die in dem installierten Zustand auf das Stromkabel zu gerichtet ist.
  5. Verbindungs-Element nach einem der vorangehenden Ansprüche, das des Weiteren eine elektrisch leitende Verbindungs-Zuleitung (104) zum Verbinden des Verbindungs-Elementes (100) mit einem Erdpunkt oder einer anderen Kabel-Abschirmung umfasst.
  6. Verbindungs-Element nach Anspruch 5, wobei die Verbindungs-Zuleitung (104) eine Umflechtung aus Metall umfasst.
  7. Verbindungs-Element nach Anspruch 5 oder 6, wobei die Verbindungs-Zuleitung (104) einen wellenförmigen Querschnitt hat.
  8. Verbindungs-Element nach einem der Ansprüche 5 bis 7, wobei die Verbindungs-Zuleitung (104) mittels einer Aufpress-Verbindung, wenigstens einer Löt-Verbindung, wenigstens einer Quetsch-Verbindung, wenigstens einer Schweiß-Verbindung und/oder wenigstens einer Niet-Verbindung mit dem Kontakt-Element (102) verbunden ist.
  9. Verbindungs-Element nach den Ansprüchen 5 bis 8, wobei die Verbindungs-Zuleitung mit dem Kontakt-Segmenten (106) an Verbindungs-Punkten (122) verbunden ist, die entlang wenigstens eines Teils der Länge der Verbindungs-Zuleitung (104) ausgerichtet sind.
  10. Verbindungs-Element nach einem der Ansprüche 5 bis 9, wobei die Verbindungs-Zuleitung (104) wenigstens zwei aufgefächerte Anschluss-Zuleitungen (120) umfasst, die mit wenigstens einem der Kontakt-Segmente (106) verbunden sind.
  11. Verbindungs-Element nach einem der vorangehenden Ansprüche, wobei das Kontakt-Element (102) aus einem gestanzten Blech hergestellt wird.
  12. Verbindungs-Element nach einem der vorangehenden Ansprüche, wobei das Kontakt-Element (102) einen rechteckigen Umriss hat und so gebogen ist, dass es in dem installierten Zustand wenigstens einen Teil einer zylindrischen Hülse bildet.
  13. Verbindungs-Element nach Anspruch 12, wobei an den Rand-Bereichen, die sich in dem installierten Zustand entlang einer Längsachse des Kabels erstrecken, wenigstens ein Erweiterungs-Segment (124) vorhanden ist, das die Umfangs-Abmessung des Kontakt-Elementes (102) in einem Teil seiner Länge in der Längsrichtung vergrößert.
  14. Verbindungs-Element nach einem der vorangehenden Ansprüche, das des Weiteren ein Klemm-Element umfasst, mit dem das Kontakt-Element an die Abschirmung des Stromkabels gedrückt wird, wobei das Klemm-Element wenigstens eine Schneckengewinde-Schelle, einen Kabelbinder und/oder eine abnehmbare Muffe umfasst.
  15. Verbindungs-Element nach einem der vorangehenden Ansprüche, wobei in dem installierten Zustand wenigstens eine Verbindungs-Zuleitung (104) direkt an einer Fläche (134) angebracht ist, die der Fläche (128) gegenüberliegt, die in Kontakt mit der Kabel-Abschirmung ist.
EP14195222.6A 2014-11-27 2014-11-27 Verbindungselement zum Kontaktieren einer Abschirmung eines Stromkabels Active EP3026757B1 (de)

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2250280A (en) * 1940-05-14 1941-07-22 Maurice M Starbird Electrical bond
US3109052A (en) * 1961-04-25 1963-10-29 Phelps Dodge Electronic Produc Connector for coaxial cables
FR2271688A1 (en) * 1974-05-17 1975-12-12 Cables De Lyon Geoffroy Delore Earthing strip for high-voltage cable screen - uses metal strip with spaced contact flaps, wrapped around screen
FR2387540A1 (fr) * 1977-04-13 1978-11-10 Scal Gp Condit Aluminium Raccordement d'ecrans de cables
DE102012220197A1 (de) 2012-11-06 2014-05-08 Tyco Electronics Raychem Gmbh Erdungsvorrichtung für den elektrisch leitfähigen Mantel eines Kabels und Verfahren zum Anbringen der Erfindungsvorrichtung

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