EP2451011B1 - Assembly for connecting electric cables - Google Patents

Assembly for connecting electric cables Download PDF

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Publication number
EP2451011B1
EP2451011B1 EP10306201.4A EP10306201A EP2451011B1 EP 2451011 B1 EP2451011 B1 EP 2451011B1 EP 10306201 A EP10306201 A EP 10306201A EP 2451011 B1 EP2451011 B1 EP 2451011B1
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EP
European Patent Office
Prior art keywords
screw
cable
protrusion
conductor
contact
Prior art date
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EP10306201.4A
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German (de)
French (fr)
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EP2451011A1 (en
Inventor
Gert Dr. Stauch
Peter Grötsch
Volker Markgraf
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Nexans SA
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Nexans SA
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Priority to DK10306201.4T priority Critical patent/DK2451011T3/en
Priority to EP10306201.4A priority patent/EP2451011B1/en
Publication of EP2451011A1 publication Critical patent/EP2451011A1/en
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Publication of EP2451011B1 publication Critical patent/EP2451011B1/en
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Classifications

    • 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
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2475—Connections using contact members penetrating or cutting insulation or cable strands the contact members penetrating the insulation being actuated by screws, nuts or bolts
    • H01R4/2483—Connections using contact members penetrating or cutting insulation or cable strands the contact members penetrating the insulation being actuated by screws, nuts or bolts penetrating the area under the screw tip
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R11/00—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts
    • H01R11/03—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations
    • H01R11/05—Individual connecting elements providing two or more spaced connecting locations for conductive members which are, or may be, thereby interconnected, e.g. end pieces for wires or cables supported by the wire or cable and having means for facilitating electrical connection to some other wire, terminal, or conductive member, blocks of binding posts characterised by the relationship between the connecting locations the connecting locations having different types of direct connections
    • 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
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
    • H01R4/2408—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation actuated by clamping screws
    • 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
    • H01R4/22—End caps, i.e. of insulating or conductive material for covering or maintaining connections between wires entering the cap from the same end

Definitions

  • the invention relates to an arrangement for the electrically conductive connection of the conductor surrounded by an insulation of two electrical cables according to the preamble of patent claim 1.
  • Such arrangements have been known for years and available on the market. They are preferably used in the low voltage range, which applies to electrical voltages of up to 1 kV, increasingly for connecting two electrical cables, of which at least one is not disconnected from the power supply during assembly. For example, in mesh networks or in annular networks, both cables can remain connected to the network.
  • a cable connected to the power supply is to be connected to a cable which is not connected to a voltage source, as a representative of the other option.
  • Such an operation is used in particular in case of failure, for example, if a leading to a consumer or multiple consumers supply cable is damaged and must be repaired.
  • the arrangement can also be used in new installations, if one or more consumers should also be connected to a voltage network or should.
  • the described mode of operation has proved itself in recent years in installations in low-voltage networks of public distribution network operators as a safe and efficient working method. It can be avoided by several hours of downtime, during which consumers, especially private households, are without electricity. By carrying out assembly work under voltage and under operating load, the period in which the low-voltage network is not available, especially when repairing damage, can be significantly reduced.
  • the fitter When connecting a live cable to a secondary cable, the fitter usually wears insulating gloves and a helmet, if necessary with a visor, in addition to suitable clothing. He also uses isolated tools.
  • the arrangements used for such assemblies designed as so-called screw connectors, for example, have a metallic pipe piece into which two cables to be connected can be inserted.
  • Such a piece of pipe has in its wall at least two threaded holes - one for each cable - in which mounting screws are screwed in mounting position.
  • a plurality of radially inwardly projecting, pointed projections are attached, which pierce the insulation of the cable during assembly and penetrate into the conductor thereof.
  • the contact pressure generated by the clamping screws used to set the cable in the pipe section ensures that the current carrying capacity of the screw is guaranteed throughout its life.
  • the suitability of such a screw connector must comply with EN 61238-1 with regard to its permanent current carrying capacity.
  • the GB 2 348 056 A describes an arrangement for the electrically conductive connection of two power cables, one of which is live. In this case, by using an abruptly released spring, the electrical cable connected to a voltage source is moved very quickly to a cable connected to electrical consumers, until both cables lie against each other at the front. Since the electrically conductive connection between the two cables is produced quickly in this way, only a short arc of a small arc.
  • FR 1 312 483 A goes out a component with which a flat conductor can be connected to an already laid insulated round conductor without the round conductor must be interrupted and not stripped. It is used to a tubular connecting element made of copper, which has at one end a recess extending in the axial direction, by means of which it can be plugged onto the running at right angles to its axis circular conductor. A tapered, guided in a threaded bore of the connecting element screw is screwed into the conductive part of the round conductor. The connecting element is then attached to the round conductor. At the other end of the connecting element, a flat conductor is fixed by means of a screw guided in a further threaded bore thereof.
  • the invention has the object of developing the above-described arrangement so that damage to the pipe section and in particular a cable to be fastened in the same by an electric arc can be largely excluded.
  • the contact screw which can be used in the arrangement according to the invention can be embodied as a simple screw with an external thread or as a so-called shear screw, which has at least one weak point at which a part is torn off when a predeterminable torque is reached when it is tightened.
  • the contact screw is shown as a shear screw. It will be considered in the following description, representative of one embodiment without the shearing vulnerability.
  • screw 1 hereinafter referred to simply as "screw 1" - has a rotating body 2 carrying an external thread and a head 4 separated from it by a peripheral weak point 3.
  • the screw 1 On the end face facing away from the head 4, the screw 1 has a projection protruding in the axial direction 5, whose cross section is small in relation to the cross section of its rotary body 2.
  • the central axis 6 of the screw 1 is also center axis of the projection 5, the so when turning the screw 1 is moved only in the axial direction.
  • the screw 1 can according to Fig. 2 have in the region of their head 4 a hole 7 with a polygonal cross-section for insertion of a tool.
  • the cross section of the bore 7 is advantageously designed as a hexagon.
  • the arrangement includes a in Fig. 3 shown in section metallic pipe section 8, which has two threaded holes 9 and 10 in its wall. Inside the pipe section 8, a plurality of radially projecting from its wall tip projections 11 and 12 is attached.
  • a connected to a voltage source electrical cable 13 is to be electrically connected to a secondary electric cable 14.
  • Both cables are preferably low voltage cables for use with electrical voltages up to 1 kV. They have an arbitrarily constructed electrical conductor, which preferably consists of aluminum and is surrounded by insulation.
  • the screw 1 is then rotated with a tool, preferably using an electric screwdriver in the threaded hole 9. It is moved in the direction of the cable 13.
  • a tool preferably using an electric screwdriver in the threaded hole 9. It is moved in the direction of the cable 13.
  • the approach 5 of the screw 1 penetrates the Insulation 18 of cable 13 ( Fig. 5 ) before entering the ladder 19 ( Fig. 6 ).
  • an electric arc is ignited between the two parts, but extinguished upon penetration of the neck 5 in the conductor 19.
  • the screw 1 should therefore be rotated as quickly as possible, so that the arc burns only for a very short period of time.
  • a cap 20 made of insulating material can advantageously be applied on its front side.
  • the cap 20 ensures that upon insertion of the cable 13 in the pipe section 8 no random, electrically conductive contact of the conductor 19 with parts of the pipe section 8 is formed.
  • the approach 5 must be carried out relatively low material according to the foregoing, so that it can easily penetrate the insulation 18 of the cable 13 and penetrate into the conductor 19. On the other hand, he should also have enough material so that it is not significantly destroyed by the same when igniting the arc.
  • Fig. 1 and 2 can approach 5 cylindrical, be designed with tapered end face. He can according to Fig. 8 overall also have a conical shape. Both forms of Fig. 1 and 8 can according to Fig. 9 be combined with a cone passing into a cylinder. The projection 5 can according to Fig. 10 also be designed as a ring.
  • a live cable is connected using the contact screw 1 with a not connected to a voltage source cable.
  • described operation of the contact screw 1 also applies when the live first - also fixed with a conventional clamping screw in the pipe section 8 and the second cable is then secured using a contact screw 1 in the pipe section 8.
  • the second cable can not be connected to a voltage source. However, it can also be connected to a voltage source.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)

Description

Die Erfindung bezieht sich auf eine Anordnung zum elektrisch leitenden Verbinden der von einer Isolierung umgebenen Leiter von zwei elektrischen Kabeln gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to an arrangement for the electrically conductive connection of the conductor surrounded by an insulation of two electrical cables according to the preamble of patent claim 1.

Derartige Anordnungen sind seit Jahren bekannt und auf dem Markt erhältlich. Sie werden vorzugsweise im Niederspannungsbereich, der für elektrische Spannungen von bis zu 1 kV gilt, in zunehmendem Maße zum Verbinden zweier elektrischer Kabel verwendet, von denen mindestens eins während der Montage nicht vom Spannungsnetz getrennt ist. Es können beispielsweise in Maschennetzen oder in ringförmigen Netzen auch beide Kabel mit dem Netz verbunden bleiben. In den folgenden Ausführungen wird - stellvertretend auch für die andere Möglichkeit - davon ausgegangen, daß ein mit dem Spannungsnetz verbundenes Kabel mit einem nicht an eine Spannungsquelle angeschlossenen Kabel verbunden werden soll. Eine solche Arbeitsweise wird insbesondere im Störungsfall eingesetzt, wenn beispielsweise ein zu einem Verbraucher oder zu mehreren Verbrauchern führendes Versorgungskabel beschädigt ist und repariert werden muß. Die Anordnung kann aber auch bei Neuinstallationen eingesetzt werden, wenn ein oder mehrere Verbraucher zusätzlich an ein Spannungsnetz angeschlossen werden soll bzw. sollen.Such arrangements have been known for years and available on the market. They are preferably used in the low voltage range, which applies to electrical voltages of up to 1 kV, increasingly for connecting two electrical cables, of which at least one is not disconnected from the power supply during assembly. For example, in mesh networks or in annular networks, both cables can remain connected to the network. In the following explanations, it is assumed that a cable connected to the power supply is to be connected to a cable which is not connected to a voltage source, as a representative of the other option. Such an operation is used in particular in case of failure, for example, if a leading to a consumer or multiple consumers supply cable is damaged and must be repaired. The arrangement can also be used in new installations, if one or more consumers should also be connected to a voltage network or should.

Die geschilderte Arbeitsweise hat sich in den letzten Jahren bei Montagen in Niederspannungsnetzen der öffentlichen Verteilnetz-Betreiber als sichere und effiziente Arbeitsmethode bewährt. Es können dadurch mehrstündige Ausfallzeiten vermieden werden, während derer Verbraucher, insbesondere private Haushalte, ohne Strom sind. Mit der Durchführung von Montagearbeiten unter Spannung und unter Betriebslast kann der Zeitraum, in dem das Niederspannungsnetz insbesondere bei der Behebung von Schadensfällen nicht zur Verfügung steht, deutlich reduziert werden.The described mode of operation has proved itself in recent years in installations in low-voltage networks of public distribution network operators as a safe and efficient working method. It can be avoided by several hours of downtime, during which consumers, especially private households, are without electricity. By carrying out assembly work under voltage and under operating load, the period in which the low-voltage network is not available, especially when repairing damage, can be significantly reduced.

Beim Anschließen eines unter Spannung stehenden Kabels an ein weiterführendes Kabel trägt der Monteur in herkömmlicher Technik zusätzlich zu einer geeigneten Kleidung in der Regel isolierende Handschuhe und einen Helm, gegebenenfalls mit Visier. Er benutzt außerdem isolierte Werkzeuge. Die für solche Montagen verwendeten, als sogenannte Schraubverbinder ausgeführten Anordnungen weisen beispielsweise ein metallisches Rohrstück auf, in das zwei zu verbindende Kabel eingesteckt werden können. Ein solches Rohrstück hat in seiner Wandung mindestens zwei Gewindebohrungen - für jedes Kabel eine - in welche in Montageposition Klemmschrauben eingeschraubt sind. Im Innenraum des Rohrstücks ist eine Vielzahl von radial nach innen abstehenden, spitzen Vorsprüngen angebracht, welche die Isolierung der Kabel während der Montage durchstoßen und in den Leiter derselben eindringen. Die von den zum Festlegen der Kabel im Rohrstück eingesetzten Klemmschrauben erzeugte Anpreßkraft sorgt dafür, daß die Stromtragfähigkeit des Schraubverbinders während dessen gesamter Lebensdauer gewährleistet ist. Die Tauglichkeit eines solchen Schraubverbinders muß hinsichtlich seines dauerhaften Stromtragvermögens der Norm EN 61238-1 entsprechen.When connecting a live cable to a secondary cable, the fitter usually wears insulating gloves and a helmet, if necessary with a visor, in addition to suitable clothing. He also uses isolated tools. The arrangements used for such assemblies, designed as so-called screw connectors, for example, have a metallic pipe piece into which two cables to be connected can be inserted. Such a piece of pipe has in its wall at least two threaded holes - one for each cable - in which mounting screws are screwed in mounting position. In the interior of the pipe section a plurality of radially inwardly projecting, pointed projections are attached, which pierce the insulation of the cable during assembly and penetrate into the conductor thereof. The contact pressure generated by the clamping screws used to set the cable in the pipe section ensures that the current carrying capacity of the screw is guaranteed throughout its life. The suitability of such a screw connector must comply with EN 61238-1 with regard to its permanent current carrying capacity.

Wenn das spannungsführende Kabel in einem Schraubverbinder befestigt werden soll, in dem bereits ein weiterführendes Kabel befestigt ist, wird bei seiner Kontaktierung ein Stromkreis geschlossen. Dementsprechend entsteht beim Betätigen der Klemmschraube, mit welcher das spannungsführende Kabel im Schraubverbinder befestigt und kontaktiert wird, in dem Moment ein elektrischer Lichtbogen, in dem zumindest einer der Vorsprünge in Kontakt mit dem Leiter des Kabels gelangt. Es ist daher ein zügiges Betätigen der Klemmschraube erforderlich, um einen länger brennenden Lichtbogen zu vermeiden. Das ist bei Betätigung der Klemmschraube von Hand kaum möglich. Aber auch der Einsatz eines Elektroschraubers reicht in vielen Fällen nicht aus, um den Lichtbogen zu beherrschen. Es kommt vielmehr in dem Moment, in dem die spitzen Vorsprünge des Rohrstücks der Anordnung den Leiter des Kabels kontaktieren, häufig zu einem relativ lange andauernden Lichtbogen. Dadurch kann die Isolierung des Kabels teilweise verbrennen, wodurch es zu Rauchentwicklung kommt. Dieser Effekt entsteht, weil der den Leiter zuerst kontaktierende Vorsprung vom Lichtbogen abgebrannt wird. Dann kommutiert der Lichtbogen zum nächsten Vorsprung und brennt diesen und folgende Vorsprünge ab. Dabei wird auch der Leiter des Kabels durch den Lichtbogen erodiert. Eine dauerhafte Stromtragfähigkeit des Schraubverbinders ist dadurch gefährdet.If the live cable is to be fastened in a screw connector in which a secondary cable is already attached, a circuit is closed during its contacting. Accordingly, upon actuation of the clamping screw, with which the live cable is fastened and contacted in the screw connector, an electrical arc is produced at the moment in which at least one of the projections comes into contact with the conductor of the cable. It is therefore a speedy operation of the clamping screw required to avoid a longer-burning arc. This is hardly possible by hand when the clamping screw is actuated. But even the use of an electric screwdriver is in many cases not sufficient to control the arc. Rather, at the moment when the pointed protrusions of the pipe section of the assembly contact the conductor of the cable, often a relatively long-lasting arc occurs. As a result, the insulation of the cable can partially burn, resulting in smoke. This effect occurs because the projection contacting the conductor first is burned off the arc. Then the arc commutes to the next projection and burns off this and subsequent projections. This is also the leader of the cable eroded by the arc. A permanent current carrying capacity of the screw is thereby endangered.

Die GB 2 348 056 A beschreibt eine Anordnung zum elektrisch leitenden Verbinden von zwei Energiekabeln, von denen eines spannungsführend ist. Dabei wird durch Einsatz einer schlagartig freigegebenen Feder das an eine Spannungsquelle angeschlossene elektrische Kabel sehr schnell auf ein mit elektrischen Verbrauchern verbundenes Kabel zu bewegt, bis beide Kabel stirnseitig aneinander liegen. Da die elektrisch leitende Verbindung zwischen beiden Kabeln auf diese Weise schnell hergestellt wird, entsteht nur kurzfristig ein kleiner Lichtbogen.The GB 2 348 056 A describes an arrangement for the electrically conductive connection of two power cables, one of which is live. In this case, by using an abruptly released spring, the electrical cable connected to a voltage source is moved very quickly to a cable connected to electrical consumers, until both cables lie against each other at the front. Since the electrically conductive connection between the two cables is produced quickly in this way, only a short arc of a small arc.

Aus der FR 1 312 483 A geht ein Bauteil hervor, mit dem ein Flachleiter an einen bereits verlegten isolierten Rundleiter angeschlossen werden kann, ohne daß der Rundleiter unterbrochen und auch nicht abisoliert werden muß. Es wird dazu ein rohrförmiges Verbindungselement aus Kupfer eingesetzt, das an einem Ende eine in axialer Richtung verlaufende Ausnehmung hat, mittels derer dasselbe auf den im rechten Winkel zu seiner Achse verlaufenden Rundleiter aufgesteckt werden kann. Eine spitz zulaufende, in einer Gewindebohrung des Verbindungselements geführte Schraube wird bis in den leitenden Teil des Rundleiters eingeschraubt. Das Verbindungselement ist dann am Rundleiter befestigt. Am anderen Ende des Verbindungselements ist ein Flachleiter mittels einer in einer weiteren Gewindebohrung desselben geführten Schraube festgelegt.From the FR 1 312 483 A goes out a component with which a flat conductor can be connected to an already laid insulated round conductor without the round conductor must be interrupted and not stripped. It is used to a tubular connecting element made of copper, which has at one end a recess extending in the axial direction, by means of which it can be plugged onto the running at right angles to its axis circular conductor. A tapered, guided in a threaded bore of the connecting element screw is screwed into the conductive part of the round conductor. The connecting element is then attached to the round conductor. At the other end of the connecting element, a flat conductor is fixed by means of a screw guided in a further threaded bore thereof.

Der Erfindung liegt die Aufgabe zugrunde, die eingangs geschilderte Anordnung so weiterzubilden, daß eine Beschädigung des Rohrstücks und insbesondere eines in demselben zu befestigenden Kabels durch einen Lichtbogen weitestgehend ausgeschlossen werden kann.The invention has the object of developing the above-described arrangement so that damage to the pipe section and in particular a cable to be fastened in the same by an electric arc can be largely excluded.

Diese Aufgabe wird entsprechend dem kennzeichnenden Merkmal des Patentanspruchs 1 gelöst.This object is achieved according to the characterizing feature of claim 1.

Bei Einsatz dieser Anordnung mit der speziell ausgeführten Kontaktschraube entsteht bei der Montage der erste Kontakt mit dem Leiter eines spannungsführenden Kabels durch die Kontaktschraube bzw. deren Ansatz, der beim Anziehen der Kontaktschraube die Isolierung des Leiters durchdringt. Die im Rohrstück vorhandenen spitzen Vorsprünge haben dann noch keinen Kontakt zum Leiter des Kabels. In dem Moment, in dem der Ansatz der Kontaktschraube den Leiter des Kabels kontaktiert, zündet bei dadurch geschlossenem Stromkreis ein Lichtbogen, der zwischen dem Ansatz und dem Leiter brennt. Im weiteren Verlauf des Schraubvorganges dringt der Ansatz in den Leiter ein und der Lichtbogen verlischt. Danach erreicht die Kontaktschraube mit der breiten Auflagefläche ihres das Außengewinde tragenden Drehkörpers den isolierten Leiter und drückt denselben in Richtung der spitzen Vorsprünge des Rohrstücks, welche die Isolierung des Kabels durchdringen und in den Leiter desselben eindringen. Ein Lichtbogen kann dabei nicht mehr gezündet werden, weil das Kabel durch die Kontaktschraube bereits elektrisch leitend mit dem Rohrstück verbunden ist. Der für den Schraubverbinder vorgeschriebene Langzeitkontakt ist damit hergestellt, ohne daß Teile des Rohrstücks und des Kabels beschädigt sind.When using this arrangement with the specially designed contact screw is formed during assembly of the first contact with the head of a live cable through the contact screw or their approach, when tightening the Contact screw penetrates the insulation of the conductor. The existing in the pipe section pointed projections then have no contact with the head of the cable. At the moment in which the approach of the contact screw contacts the conductor of the cable, ignited thereby closed circuit an arc that burns between the neck and the head. In the further course of the screwing process, the approach penetrates into the conductor and the arc extinguishes. After that reaches the Contact screw with the wide bearing surface of its external thread carrying rotary body the insulated conductor and pushes the same in the direction of the pointed projections of the pipe section, which penetrate the insulation of the cable and penetrate into the conductor thereof. An arc can not be ignited because the cable is already connected by the contact screw electrically conductive with the pipe section. The prescribed for the screw long-term contact is made with it, without parts of the pipe section and the cable are damaged.

Ausführungsbeispiele des Erfindungsgegenstandes sind in den Zeichnungen dargestellt.Embodiments of the subject invention are illustrated in the drawings.

Es zeigen:

  • Fig. 1 eine in der Anordnung nach der Erfindung verwendbare Kontaktschraube.
  • Fig. 2 einen Querschnitt der Kontaktschraube nach Fig. 1.
  • Fig. 3 ein in der Anordnung nach der Erfindung verwendbares Rohrstück im Schnitt.
  • Fig. 4 bis 7 die Anordnung nach der Erfindung in vier unterschiedlichen Montagepositionen.
  • Fig. 8 bis 10 Schnittbilder von drei unterschiedlichen, gegenüber den Fig. 1 und 2 abgewandelten Ausführungsformen der Kontaktschraube.
Show it:
  • Fig. 1 a usable in the arrangement according to the invention contact screw.
  • Fig. 2 a cross section of the contact screw after Fig. 1 ,
  • Fig. 3 a usable in the arrangement according to the invention pipe section in section.
  • Fig. 4 to 7 the arrangement according to the invention in four different mounting positions.
  • Fig. 8 to 10 Cross-sectional images of three different, opposite the Fig. 1 and 2 modified embodiments of the contact screw.

Die in der Anordnung nach der Erfindung einsetzbare Kontaktschraube kann als einfache Schraube mit einem Außengewinde oder als sogenannte Abscherschraube ausgeführt sein, die mindestens eine Schwachstelle aufweist, an der beim Erreichen eines vorgebbaren Drehmoments beim Anziehen derselben ein Teil abgerissen wird. In den Zeichnungen ist die Kontaktschraube als Abscherschraube dargestellt. Sie wird in der folgenden Beschreibung berücksichtigt, stellvertretend auch für eine Ausführungsform ohne der Abscherung dienende Schwachstelle.The contact screw which can be used in the arrangement according to the invention can be embodied as a simple screw with an external thread or as a so-called shear screw, which has at least one weak point at which a part is torn off when a predeterminable torque is reached when it is tightened. In the drawings, the contact screw is shown as a shear screw. It will be considered in the following description, representative of one embodiment without the shearing vulnerability.

Die in Fig. 1 dargestellte Kontaktschraube 1 - im folgenden kurz "Schraube 1" genannt-hat einen ein Außengewinde tragenden Drehkörper 2 und einen durch eine umlaufende Schwachstelle 3 von demselben getrennten Kopf 4. An der dem Kopf 4 abgewandten Stirnseite weist die Schraube 1 einen in axialer Richtung abstehenden Ansatz 5 auf, dessen Querschnitt klein im Verhältnis zum Querschnitt ihres Drehkörpers 2 ist. Die Mittelachse 6 der Schraube 1 ist auch Mittelachse des Ansatzes 5, der damit beim Drehen der Schraube 1 nur in deren Achsrichtung bewegt wird. Die Schraube 1 kann gemäß Fig. 2 im Bereich ihres Kopfes 4 eine Bohrung 7 mit polygonalem Querschnitt zum Einführen eines Werkzeugs haben. Der Querschnitt der Bohrung 7 ist mit Vorteil als Sechseck ausgeführt.In the Fig. 1 Contact screw 1 - hereinafter referred to simply as "screw 1" - has a rotating body 2 carrying an external thread and a head 4 separated from it by a peripheral weak point 3. On the end face facing away from the head 4, the screw 1 has a projection protruding in the axial direction 5, whose cross section is small in relation to the cross section of its rotary body 2. The central axis 6 of the screw 1 is also center axis of the projection 5, the so when turning the screw 1 is moved only in the axial direction. The screw 1 can according to Fig. 2 have in the region of their head 4 a hole 7 with a polygonal cross-section for insertion of a tool. The cross section of the bore 7 is advantageously designed as a hexagon.

Zur Anordnung gehört ein in Fig. 3 im Schnitt dargestelltes metallisches Rohrstück 8, das in seiner Wandung zwei Gewindebohrungen 9 und 10 aufweist. Im Innern des Rohrstücks 8 ist eine Vielzahl von radial von seiner Wandung abstehenden spitzen Vorsprüngen 11 und 12 angebracht.The arrangement includes a in Fig. 3 shown in section metallic pipe section 8, which has two threaded holes 9 and 10 in its wall. Inside the pipe section 8, a plurality of radially projecting from its wall tip projections 11 and 12 is attached.

Mit der Anordnung nach der Erfindung soll beispielsweise ein an eine Spannungsquelle angeschlossenes elektrisches Kabel 13 mit einem weiterführenden elektrischen Kabel 14 elektrisch leitend verbunden werden. Beide Kabel sind vorzugsweise Niederspannungskabel für einen Einsatz mit elektrischen Spannungen bis zu 1 kV. Sie weisen einen beliebig aufgebauten elektrischen Leiter auf, der vorzugsweise aus Aluminium besteht und von einer Isolierung umgeben ist.With the arrangement according to the invention, for example, a connected to a voltage source electrical cable 13 is to be electrically connected to a secondary electric cable 14. Both cables are preferably low voltage cables for use with electrical voltages up to 1 kV. They have an arbitrarily constructed electrical conductor, which preferably consists of aluminum and is surrounded by insulation.

Die Anordnung nach der Erfindung wird beispielsweise wie folgt montiert:

  • In das Rohrstück 8 wird zunächst das Kabel 14 eingeführt und mittels einer Klemmschraube 15 festgelegt. Dabei durchdringen die Vorsprünge 12 die Isolierung 16 des Kabels 14. Sie dringen in dessen Leiter 16 ein, so daß das Kabel 14 elektrisch leitend mit dem Rohrstück 8 verbunden ist. Diese Position des Kabels 14 geht aus den Fig. 4 bis 7 unverändert hervor.
The arrangement according to the invention is mounted, for example, as follows:
  • In the pipe section 8, the cable 14 is first inserted and fixed by means of a clamping screw 15. In this case, the projections 12 penetrate the insulation 16 of the cable 14. They penetrate into the conductor 16, so that the cable 14 is electrically conductively connected to the pipe section 8. This position of the cable 14 goes out of the Fig. 4 to 7 unchanged.

Anschließend werden das an eine Spannungsquelle angeschlossene Kabel 13 in das Rohrstück 8 eingeführt und die Schraube 1 in die Gewindebohrung 9 eingeschraubt, so wie es in Fig. 4 gezeigt ist. Das Kabel 13 liegt dann auf den Vorsprüngen 11 des Rohrstücks 8 auf und die Schraube 1 hat noch keine Berührung mit demselben.Subsequently, the connected to a voltage source cable 13 are inserted into the pipe section 8 and the screw 1 is screwed into the threaded hole 9, as it is in Fig. 4 is shown. The cable 13 is then on the projections 11 of the pipe section 8 and the screw 1 has no contact with the same.

Die Schraube 1 wird dann mit einem Werkzeug, vorzugsweise unter Einsatz eines Elektroschraubers, in der Gewindebohrung 9 gedreht. Sie wird dabei in Richtung des Kabels 13 bewegt. Dabei durchdringt zunächst der Ansatz 5 der Schraube 1 die Isolierung 18 des Kabels 13 (Fig. 5), bevor er in den Leiter 19 desselben eindringt (Fig. 6). In dem Moment, in dem der Ansatz 5 den Leiter 19 berührt, wird zwischen beiden Teilen ein elektrischer Lichtbogen gezündet, der aber beim Eindringen des Ansatzes 5 in den Leiter 19 erlischt. Die Schraube 1 soll daher möglichst schnell gedreht werden, damit der Lichtbogen nur für eine sehr kurze Zeitdauer brennt.The screw 1 is then rotated with a tool, preferably using an electric screwdriver in the threaded hole 9. It is moved in the direction of the cable 13. First, the approach 5 of the screw 1 penetrates the Insulation 18 of cable 13 ( Fig. 5 ) before entering the ladder 19 ( Fig. 6 ). In the moment in which the approach 5 touches the conductor 19, an electric arc is ignited between the two parts, but extinguished upon penetration of the neck 5 in the conductor 19. The screw 1 should therefore be rotated as quickly as possible, so that the arc burns only for a very short period of time.

Beim Weiterdrehen der Schraube 1 drückt deren mit dem Außengewinde versehener Drehkörper 2 mit seiner großflächigen Stirnseite auf das Kabel 13, das dadurch gegen die Vorsprünge 11 des Rohrstücks 8 gedrückt wird. Die Vorsprünge 11 durchdringen die Isolierung 18 des Kabels 13. Sie dringen in dessen Leiter 19 ein, wodurch die gewünschte und vorgeschriebene Kontaktgabe sichergestellt ist. Die Endposition der Anordnung geht aus Fig. 7 hervor.Upon further rotation of the screw 1 whose provided with the external thread rotary body 2 presses with its large-scale end face on the cable 13, which is thereby pressed against the projections 11 of the pipe section 8. The projections 11 penetrate the insulation 18 of the cable 13. They penetrate into the conductor 19, whereby the desired and prescribed contact is ensured. The end position of the arrangement goes out Fig. 7 out.

Vor dem Einführen des Kabels 13 in das Rohrstück 8 kann auf dessen Stirnseite mit Vorteil eine Kappe 20 aus Isoliermaterial aufgebracht werden. Die Kappe 20 stellt sicher, daß beim Einführen des Kabels 13 in das Rohrstück 8 kein zufälliger, elektrisch leitender Kontakt des Leiters 19 mit Teilen des Rohrstücks 8 entsteht.Before inserting the cable 13 into the pipe section 8, a cap 20 made of insulating material can advantageously be applied on its front side. The cap 20 ensures that upon insertion of the cable 13 in the pipe section 8 no random, electrically conductive contact of the conductor 19 with parts of the pipe section 8 is formed.

Der Ansatz 5 muß entsprechend den vorangehenden Ausführungen relativ materialarm ausgeführt sein, damit er die Isolierung 18 des Kabels 13 leicht durchdringen und in dessen Leiter 19 eindringen kann. Er soll andererseits aber auch ausreichend Material aufweisen, damit er beim Zünden des Lichtbogens nicht wesentlich von demselben zerstört wird.The approach 5 must be carried out relatively low material according to the foregoing, so that it can easily penetrate the insulation 18 of the cable 13 and penetrate into the conductor 19. On the other hand, he should also have enough material so that it is not significantly destroyed by the same when igniting the arc.

Gemäß Fig. 1 und 2 kann der Ansatz 5 zylinderförmig, mit spitz zulaufender Stirnseite ausgeführt sein. Er kann gemäß Fig. 8 insgesamt auch eine konische Form haben. Beide Formen der Fig. 1 und 8 können gemäß Fig. 9 kombiniert sein, mit einem in einen Zylinder übergehenden Konus. Der Vorsprung 5 kann gemäß Fig. 10 auch als Ring ausgeführt sein.According to Fig. 1 and 2 can approach 5 cylindrical, be designed with tapered end face. He can according to Fig. 8 overall also have a conical shape. Both forms of Fig. 1 and 8 can according to Fig. 9 be combined with a cone passing into a cylinder. The projection 5 can according to Fig. 10 also be designed as a ring.

Im Vorangehenden ist der Einsatz der Anordnung nach der Erfindung für den Fall beschrieben, daß ein spannungsführendes Kabel unter Einsatz der Kontaktschraube 1 mit einem nicht an eine Spannungsquelle angeschlossenen Kabel verbunden wird. Die in diesem Zusammenhang beschriebene Wirkungsweise der Kontaktschraube 1 gilt auch dann, wenn das spannungsführende zuerst-auch mit einer herkömmlichen Klemmschraube-im Rohrstück 8 festgelegt und das zweite Kabel danach unter Einsatz einer Kontaktschraube 1 im Rohrstück 8 befestigt wird. Das zweite Kabel kann dabei nicht mit einer Spannungsquelle verbunden sein. Es kann aber auch ebenfalls an eine Spannungsquelle angeschlossen sein.In the foregoing, the use of the arrangement according to the invention for the case is described that a live cable is connected using the contact screw 1 with a not connected to a voltage source cable. The In this context, described operation of the contact screw 1 also applies when the live first - also fixed with a conventional clamping screw in the pipe section 8 and the second cable is then secured using a contact screw 1 in the pipe section 8. The second cable can not be connected to a voltage source. However, it can also be connected to a voltage source.

Claims (8)

  1. A device for the electrically conducting connection of the conductors (19,17) which are surro unded by an insulation (18,16) of two electrical cables (13,14) from which at least one is connected to a voltage source, which composes a tube like clamp (8) of metal for the insertion of the two cables (13,14) which has at least two tap holes (9,10) in its wall, into which in mounting position a clamping screw is screwed respectively, which has an outer thread positioned on a strew body (2), and in the interior of which two rows of teeth (11,12) extending radially from its wall are arranged, characterized in that one clamping screw (1) which serves for the fastening of at least one of the cables (13,14) is provided as a contact screw (1) which has at its end face which is provided to abut to the cable (13,14) which is positioned within the clamp (8) a protrusion (5) which extends in axial direction with dimensions which are small in comparison to the dimension of the screw body (2) of the contact screw (1) and which penetrates though the insulation (16,18) of the respective cable (13,14) to abut at least to its conductor (17,19) earlierthen the teeth (11) of the clamp (8) penetrate the insulation (16,18) of the cable (13,14) and enterinto the conductor (17,19) of the same.
  2. A device according to claim 1, characterized in that the contact screw (1) is used for the fastening or contacting of a cable (13) which is connected to a voltage source.
  3. A device according to claim 1 or 2, characterized in that a cap (20) ofinsulating material is provided at the end of the cable or cables (13,14) which is or are c o nne c te d to the voltage source which protrudes into the clamp (8).
  4. A contact screw for a device according to claim 1, which has a screw body (2) with an outer thread, characterized in that the end face of the strew body (2) which is provided to abut to a cable has a protrusion (5) with a cross section which is small in comparison to the cross section of the screw b o dy (2) and which extendsin axial direction of the screw body (2).
  5. A screw according to claim 4, characterized in that the center axis of the screw (1) also is centeraxisofthe protrusion (5).
  6. A screw according to claim 4 or 5, characterized in that the protrusion (5) has a tapered form.
  7. A screw according to claim 4 or 5, characterized in that the protrusion (5) has a conicalform.
  8. A screw according to claim 4 or 5, characterized in that the protrusion (5) is a ring.
EP10306201.4A 2010-11-03 2010-11-03 Assembly for connecting electric cables Active EP2451011B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DK10306201.4T DK2451011T3 (en) 2010-11-03 2010-11-03 Device for connecting electrical cables
EP10306201.4A EP2451011B1 (en) 2010-11-03 2010-11-03 Assembly for connecting electric cables

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10306201.4A EP2451011B1 (en) 2010-11-03 2010-11-03 Assembly for connecting electric cables

Publications (2)

Publication Number Publication Date
EP2451011A1 EP2451011A1 (en) 2012-05-09
EP2451011B1 true EP2451011B1 (en) 2015-09-16

Family

ID=43708257

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10306201.4A Active EP2451011B1 (en) 2010-11-03 2010-11-03 Assembly for connecting electric cables

Country Status (2)

Country Link
EP (1) EP2451011B1 (en)
DK (1) DK2451011T3 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1312483A (en) * 1961-10-18 1962-12-21 Instant socket on electric current conductor wire
GB2083293B (en) * 1980-08-29 1985-03-20 Lian Huang Liu Penetrating-screw
GB2348056A (en) * 1999-01-29 2000-09-20 Whitaker Corp Connecting a branch cable to a live power cable
DE29906688U1 (en) * 1999-04-15 1999-10-07 Adamietz Joerg Luster clamp with pointed screw
AU2007201069B2 (en) * 2006-03-15 2010-02-25 Cable Accessories (Australia) Pty. Ltd. Cable connection device

Also Published As

Publication number Publication date
DK2451011T3 (en) 2015-12-07
EP2451011A1 (en) 2012-05-09

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