EP0821369B1 - Metallic sheath for an electrical cable - Google Patents

Metallic sheath for an electrical cable Download PDF

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Publication number
EP0821369B1
EP0821369B1 EP97401521A EP97401521A EP0821369B1 EP 0821369 B1 EP0821369 B1 EP 0821369B1 EP 97401521 A EP97401521 A EP 97401521A EP 97401521 A EP97401521 A EP 97401521A EP 0821369 B1 EP0821369 B1 EP 0821369B1
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EP
European Patent Office
Prior art keywords
tube
sheath
cable
corrugated
metal
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EP97401521A
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German (de)
French (fr)
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EP0821369A3 (en
EP0821369A2 (en
Inventor
Gerhard Dr.Ing. Ziemek
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Alcatel Lucent SAS
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Alcatel CIT SA
Alcatel SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/0009—Apparatus or processes specially adapted for manufacturing conductors or cables for forming corrugations on conductors or cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/20—Metal tubes, e.g. lead sheaths
    • H01B7/202—Longitudinal lapped metal tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49123—Co-axial cable

Definitions

  • the invention relates to a metallic sheath for an electrical cable with a ratio from inner diameter Di to outer diameter Da of at least 0.90.
  • Metallic sheaths for protecting electrical cables have long been known. Especially at underground cables, the metal sheath is designed to insulate against moisture protect.
  • a metallic sheath consists of a lead sheath over the insulating layer is extruded.
  • the lead sheath has the great advantage that leakage currents are dissipated well can.
  • the connection of two lead coats in particular is very easy to carry out.
  • the lead sheath protects the cable from moisture, but does not hinder the flexibility of the Cable.
  • the wall thickness of the lead jacket is approximately 10% of the outside diameter. Due to ecological requirements, the lead jacket should in future be covered by other metal jackets be replaced with identical properties
  • corrugated jacket was developed as an alternative to the lead jacket. This is what it is about is a longitudinally welded metal pipe, which after welding with a helical or annular corrugation is provided.
  • the corrugation gives the relative thin-walled jacket a higher strength and better flexibility.
  • a longitudinally running metal strip is made using a molding tool formed into a tube, the tube was longitudinally welded and corrugated.
  • the metal band becomes too a tube with a larger diameter than the diameter of the inserted into the slotted tube Cable core shaped to prevent damage to the cable core by the arc of the Avoid welding equipment.
  • the cable core is by the Corrugated process arising troughs gripped.
  • a corrugated metal sheath for electrical cables which the inside diameter Di of the corrugated tube between 0.75 and 0.85 of Outside diameter because of the corrugated pipe.
  • the distance between two neighboring ones Wave crests are 0.15 to 0.25 of Da and the wall thickness is 0.005 to 0.02 of Da.
  • the corrugated process is a process such as that described in DE-AS 1086314.
  • a rotatably arranged in a rotary driven well head Weller roller ring rolls on the surface of the welded pipe and presses because it is mounted eccentrically in the well head, the tube wall. With this procedure you can Pipes with a ratio of outside diameter Da to wall thickness s of less than 30 and not manufacture more than 100 without special precautions.
  • the object of the present invention is to provide a metallic, corrugated jacket for a electrical cable with a ratio of inner diameter Di to outer diameter Da of more than 0.90, which is sufficiently flexible, offers metallic protection, without increasing the diameter of the cable too much.
  • the jacket consists of a longitudinally welded, corrugated metal tube, whose wall thickness s is between 0.009 and 0.005 Da and at which is the distance p between two adjacent wave crests between 0.12 and 0.08 Da is.
  • a metallic sheath for an electrical cable according to the invention is defined in claim 1.
  • An electrical power cable according to the invention is defined in claim 5.
  • a method for producing a power cable according to the invention is defined in claim 8.
  • the main advantage of the invention is that with the jacket according to the teaching of Invention equipped cable easily in place of a provided with a lead jacket Cable can be laid because the corrugated jacket is not stronger according to the teaching of the invention applies as the analog lead coat.
  • the cable sheath is easy to bend and has excellent dent resistance, or Lateral stability.
  • shaft spacing Through the appropriate selection of shaft spacing, shaft depth at given the outside diameter, the wall thickness s can be reduced to a level which is required for the electrical properties.
  • the invention also relates to an electrical power cable consisting of a conductor, a conductor smoothing, an insulating layer based on plastic, an outer conductive layer and a metallic outer jacket resting on the outer conductive layer.
  • the cable jacket is a corrugated tube
  • the ratio of Inner diameter Di to outer diameter Da is greater than 0.90
  • the wall thickness between 0.009 and 0.005
  • the distance between two adjacent wave crests between 0.12 and 0.08 Da.
  • a copper alloy is used as the material for the cable sheath, which is an electrical one Has conductivity of 44% IACS and therefore all requirements from an electrical point of view Fulfills.
  • the alloy should be easy to weld so that high welding speeds can be achieved be and have good ductility so that the corrugation easily into the tube can be molded.
  • FIGS. 1 and 2 Exemplary embodiments explained in more detail.
  • Figure 1 shows the principle of the production of corrugated pipes, the corrugation according to the type the state of the art.
  • a metal strip 1 drawn off from a supply spool, not shown, is by means of a Forming tool 3 formed into a slotted tube 2.
  • a Forming tool 3 formed into a slotted tube 2.
  • the slotted tube 2 is produced with a diameter such that between the cable core 4th and the slot of the slotted tube 2 has a sufficient gap so that the cable core 4 is not damaged if the slot by means of the welding device 5 - one Arc welding device or a laser welding device - is closed.
  • the welded tube 6 is then fed to a corrugated device 7, which consists of the welded, smooth tube 6 produces a corrugated tube 8.
  • the corrugation of the corrugated tube 8 is such that the Cable core 4 is grasped by the corrugation, d. H. the troughs of the corrugated tube 8 are on the Cable core 4 on.
  • Such a method is known in principle from DE-AS 1086314.
  • FIG. 2 shows a conventional cable with a cable core 4 in the left half of the figure and a lead jacket 9 resting on the cable core 4.
  • the wall thickness of the Lead sheath is determined by the mechanical requirements and for the Current carrying capacity of the cable required cross section.
  • the wall thickness of the lead jacket conventional lead sheathed cable is between 5 and 10% of the outside diameter of the Lead jacket.
  • the corrugation of the jacket 10 according to the teaching of the invention (right half of Figure 2) is so designed that the outer diameter Da and the inner diameter Di the Correspond to the outer diameter and the inner diameter of the lead jacket 9, d. H. the Jacket 10 replaces lead jacket 9 without changing the geometrical dimensions have to.
  • a provided with the jacket 10 according to the invention can thus like that known lead sheathed cables are pulled into cable ducts and thereby a previously used Replace lead sheathed cable.
  • the electrical properties of the jacket 10 are achieved in that as a material for the jacket uses a copper alloy with 90% by weight copper and 10% by weight zinc, which has a conductivity of 44% IACS.
  • the table shows the dimensions of three cable sheaths made from the copper alloy mentioned. Dam] Di [mm] s [mm] p [mm] t [mm] 72.5 67.2 0.5 7.1 2.15 58.65 53.85 0.5 6.2 1.9 39.50 35.6 0.35 4.6 1.62

Description

Die Erfindung betrifft einen metallischen Mantel für ein elektrisches Kabel mit einem Verhältnis von Innendurchmesser Di zu Außendurchmesser Da von mindestens 0,90.The invention relates to a metallic sheath for an electrical cable with a ratio from inner diameter Di to outer diameter Da of at least 0.90.

Metallische Mäntel als Schutz für elektrische Kabel sind seit langem bekannt. Insbesondere bei erdverlegten Kabeln soll der Metallmantel die Isolierung vor dem Eindringen von Feuchtigkeit schützen.Metallic sheaths for protecting electrical cables have long been known. Especially at underground cables, the metal sheath is designed to insulate against moisture protect.

Eine Form eines metallischen Mantels besteht in einem Bleimantel, der über die Isolierschicht extrudiert wird. Der Bleimantel hat den großen Vorteil, daß Fehlerströme gut abgeleitet werden können. Insbesondere die Durchverbindung zweier Bleimäntel ist sehr einfach durchzuführen. Der Bleimantel schützt das Kabel vor Feuchtigkeit, behindert dennoch nicht die Biegbarkeit des Kabels. Die Wanddicke des Bleimantels beträgt in etwa 10 % des Außendurchmessers. Aufgrund ökologischer Forderungen soll der Bleimantel in Zukunft durch andere Metallmäntel mit identischen Eigenschaften ersetzt werdenOne form of a metallic sheath consists of a lead sheath over the insulating layer is extruded. The lead sheath has the great advantage that leakage currents are dissipated well can. The connection of two lead coats in particular is very easy to carry out. The lead sheath protects the cable from moisture, but does not hinder the flexibility of the Cable. The wall thickness of the lead jacket is approximately 10% of the outside diameter. Due to ecological requirements, the lead jacket should in future be covered by other metal jackets be replaced with identical properties

Als Alternative zum Bleimantel wurde der sogenannte Wellmantel entwickelt. Hierbei handelt es sich um ein längsnahtgeschweißtes Metallrohr, welches nach der Schweißung mit einer schraubenlinien- oder ringförmigen Wellung versehen wird. Durch die Wellung erhält der relativ dünnwandige Mantel eine höhere Festigkeit sowie eine bessere Biegbarkeit. Als Werkstoffe für den Wellmantel haben sich zunächst Kupfer, später hauptsächlich Stahl durchgesetzt, nachdem das Problem der Korrosion gelöst war.The so-called corrugated jacket was developed as an alternative to the lead jacket. This is what it is about is a longitudinally welded metal pipe, which after welding with a helical or annular corrugation is provided. The corrugation gives the relative thin-walled jacket a higher strength and better flexibility. As materials for the corrugated sheath initially copper, later mainly steel, after the problem of corrosion was solved.

Beim Wellmantelverfahren wird ein längseinlaufendes Metallband mittels eines Formwerkzeugs zu einem Rohr geformt, das Rohr längsnahtgeschweißt und gewellt. Das Metallband wird zu einem Rohr mit größerem Durchmesser als der Durchmesser der in das Schlitzrohr eingeführten Kabelseele geformt, um eine Beschädigung der Kabelseele durch den Lichtbogen der Schweißeinrichtung zu vermeiden. Beim Wellen wird die Kabelseele durch die beim Wellvorgang entstehenden Wellentäler gegriffen.In the corrugated jacket process, a longitudinally running metal strip is made using a molding tool formed into a tube, the tube was longitudinally welded and corrugated. The metal band becomes too a tube with a larger diameter than the diameter of the inserted into the slotted tube Cable core shaped to prevent damage to the cable core by the arc of the Avoid welding equipment. When waves, the cable core is by the Corrugated process arising troughs gripped.

Aus der CA-PS 603 527 ist ein gewellter Metallmantel für elektrische Kabel bekannt, bei welchem der Innendurchmesser Di des gewellten Rohres zwischen 0,75 und 0,85 des Außendurchmesser Da des gewellten Rohres liegt. Der Abstand zweier benachbarter Wellenberge beträgt 0,15 bis 0,25 von Da und die Wanddicke liegt bei 0,005 bis 0,02 von Da.From CA-PS 603 527 a corrugated metal sheath for electrical cables is known which the inside diameter Di of the corrugated tube between 0.75 and 0.85 of Outside diameter because of the corrugated pipe. The distance between two neighboring ones Wave crests are 0.15 to 0.25 of Da and the wall thickness is 0.005 to 0.02 of Da.

Durch diese Abmessungen wird ein Optimum an Flexibilität, Gewicht, Beulfestigkeit etc. erreicht.These dimensions ensure optimum flexibility, weight, dent resistance etc. reached.

Bei dem Wellverfahren handelt es sich um ein Verfahren, wie es beispielsweise in der DE-AS 1086314 beschrieben ist. Ein drehbar in einem drehangetriebenem Wellerkopf angeordneter Wellerwälzring wälzt sich auf der Oberfläche des geschweißten Rohres ab und drückt, da er exzentrisch im Wellerkopf gelagert ist, die Rohrwand ein. Mit diesem Verfahren lassen sich Rohre mit einem Verhältnis von Außendurchmesser Da zu Wanddicke s von weniger als 30 und mehr als 100 nicht ohne besondere Vorkehrungen herstellen.The corrugated process is a process such as that described in DE-AS 1086314. A rotatably arranged in a rotary driven well head Weller roller ring rolls on the surface of the welded pipe and presses because it is mounted eccentrically in the well head, the tube wall. With this procedure you can Pipes with a ratio of outside diameter Da to wall thickness s of less than 30 and not manufacture more than 100 without special precautions.

Aufgabe der vorliegenden Erfindung ist es, einen metallischen, gewellten Mantel für ein elektrisches Kabel mit einem Verhältnis von Innendurchmesser Di zu Außendurchmesser Da von mehr als 0,90 herzustellen, der hinreichend flexibel ist, einen metallischen Schutz bietet, ohne den Durchmesser des Kabels zu stark zu vergrößern.The object of the present invention is to provide a metallic, corrugated jacket for a electrical cable with a ratio of inner diameter Di to outer diameter Da of more than 0.90, which is sufficiently flexible, offers metallic protection, without increasing the diameter of the cable too much.

Diese Aufgabe wird dadurch gelöst, daß der Mantel aus einem längsnahtgeschweißten, gewellten Metallrohr besteht, dessen Wanddicke s zwischen 0,009 und 0,005 Da beträgt und bei welchem der Abstand p von zwei benachbarter Wellenkuppen zwischen 0,12 und 0,08 Da beträgt.This object is achieved in that the jacket consists of a longitudinally welded, corrugated metal tube, whose wall thickness s is between 0.009 and 0.005 Da and at which is the distance p between two adjacent wave crests between 0.12 and 0.08 Da is.

Ein metallischer Mantel für ein elektrisches Kabel gemäß der Erfindung ist im Anspruch 1 definiert. Ein elektrisches Starkstromkabel gemäß der Erfindung ist im Anspruch 5 definiert. Ein Verfahren zur Herstellung eines Starkstromkabels gemäß der Erfindung ist im Anspruch 8 definiert.A metallic sheath for an electrical cable according to the invention is defined in claim 1. An electrical power cable according to the invention is defined in claim 5. A method for producing a power cable according to the invention is defined in claim 8.

Der wesentliche Vorteil der Erfindung besteht darin, daß ein mit dem Mantel nach der Lehre der Erfindung ausgestattetes Kabel ohne weiteres an Stelle eines mit einem Bleimantel versehenen Kabels verlegt werden kann, da der Wellmantel nach der Lehre der Erfindung nicht stärker aufträgt als der analoge Bleimantel.The main advantage of the invention is that with the jacket according to the teaching of Invention equipped cable easily in place of a provided with a lead jacket Cable can be laid because the corrugated jacket is not stronger according to the teaching of the invention applies as the analog lead coat.

Durch geeignete Auswahl des Werkstoffs für den Mantel, bzw. durch gezielte Beschichtung ist der Mantel gegen Korrosion geschützt.By suitable selection of the material for the jacket, or by targeted coating the jacket protected against corrosion.

Der Kabelmantel ist gut biegbar und weist eine hervorragende Beulfestigkeit, bzw. Querstabilität auf. Durch die geeignete Auswahl von Wellenabstand, Welltiefe bei vorgegebenem Außendurchmesser kann die Wanddicke s bis auf ein Maß gesenkt werden, welches für die elektrischen Eigenschaften erforderlich ist.The cable sheath is easy to bend and has excellent dent resistance, or Lateral stability. Through the appropriate selection of shaft spacing, shaft depth at given the outside diameter, the wall thickness s can be reduced to a level which is required for the electrical properties.

Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen erfaßt.Further advantageous embodiments are covered in the subclaims.

Die Erfindung betrifft ebenfalls ein elektrisches Starkstromkabel bestehend aus einem Leiter, einer Leiterglättung, einer Isolierschicht auf Kunststoffbasis, einer äußeren Leitschicht und einemauf der äußeren Leitschicht aufliegenden metallischen Außenmantel.The invention also relates to an electrical power cable consisting of a conductor, a conductor smoothing, an insulating layer based on plastic, an outer conductive layer and a metallic outer jacket resting on the outer conductive layer.

Gemäß der Erfindung ist der Kabelmantel ein gewelltes Rohr, dessen Verhältnis von Innendurchmesser Di zu Außendurchmesser Da größer als 0.90 ist, dessen Wanddicke zwischen 0,009 und 0,005 Da ist und bei dem der Abstand zweier benachbarter Wellenkuppen zwischen 0,12 und 0,08 Da beträgt.According to the invention, the cable jacket is a corrugated tube, the ratio of Inner diameter Di to outer diameter Da is greater than 0.90, the wall thickness between 0.009 and 0.005 There is and at which the distance between two adjacent wave crests between 0.12 and 0.08 Da.

Als Werkstoff für den Kabelmantel wird eine Kupferlegierung verwendet, die eine elektrische Leitfähigkeit von 44 % IACS aufweist und damit alle Anforderungen aus elektrischer Sicht erfüllt. Die Legierung soll gut schweißbar sein, so daß hohe Schweißgeschwindigkeiten erreicht werden und eine gute Verformbarkeit aufweisen, so daß die Wellung leicht in das Rohr eingeformt werden kann.A copper alloy is used as the material for the cable sheath, which is an electrical one Has conductivity of 44% IACS and therefore all requirements from an electrical point of view Fulfills. The alloy should be easy to weld so that high welding speeds can be achieved be and have good ductility so that the corrugation easily into the tube can be molded.

Für manche Anwendungsfälle kann es von Vorteil sein, wenn auf den Metallmantel ein Kunststoffaußenmantel aufliegt. For some applications it can be an advantage if the metal jacket is used Plastic outer jacket rests.

Die Erfindung ist anhand des in den Figuren 1 und 2 schematisch dargestellten Ausführungsbeispielen näher erläutert.The invention is illustrated schematically in FIGS. 1 and 2 Exemplary embodiments explained in more detail.

Figur 1 zeigt das Prinzip der Herstellung gewellter Rohre, wobei die Wellung vom Typ nach dem Stand der Technik ist.Figure 1 shows the principle of the production of corrugated pipes, the corrugation according to the type the state of the art.

Ein von einer nicht dargestellten Vorratsspule abgezogenes Metallband 1 wird mittels eines Formwerkzeugs 3 zu einem Schlitzrohr 2 geformt. In das noch offene Schlitzrohr 2 wird eine von einer ebenfalls nicht dargestellten Vorratstrommel abgezogene Kabelseele 4 eingefahren. Das Schlitzrohr 2 wird mit einem solchen Durchmesser hergestellt, daß zwischen Kabelseele 4 und dem Schlitz des Schlitzrohres 2 ein ausreichender Spalt verbleibt, damit die Kabelseele 4 keinen Schaden erleidet, wenn der Schlitz mittels der Schweißvorrichtung 5 - einer Lichtbogenschweißeinrichtung oder einer Laserschweißeinrichtung - geschlossen wird. Das geschweißte Rohr 6 wird dann einer Wellvorrichtung 7 zugeführt, die aus dem geschweißten, glatten Rohr 6 ein Wellrohr 8 herstellt. Die Wellung des Wellrohres 8 ist derart, daß die Kabelseele 4 von der Wellung gefaßt wird, d. h. die Wellentäler des Wellrohres 8 liegen auf der Kabelseele 4 auf. Ein solches Verfahren ist im Prinzip aus der DE-AS 1086314 bekannt.A metal strip 1 drawn off from a supply spool, not shown, is by means of a Forming tool 3 formed into a slotted tube 2. In the still open slot tube 2 retracted cable core 4 pulled from a storage drum, also not shown. The slotted tube 2 is produced with a diameter such that between the cable core 4th and the slot of the slotted tube 2 has a sufficient gap so that the cable core 4 is not damaged if the slot by means of the welding device 5 - one Arc welding device or a laser welding device - is closed. The welded tube 6 is then fed to a corrugated device 7, which consists of the welded, smooth tube 6 produces a corrugated tube 8. The corrugation of the corrugated tube 8 is such that the Cable core 4 is grasped by the corrugation, d. H. the troughs of the corrugated tube 8 are on the Cable core 4 on. Such a method is known in principle from DE-AS 1086314.

In der Figur 2 ist in der linken Hälfte der Figur ein herkömmliches Kabel mit einer Kabelseele 4 und einem auf der Kabelseele 4 aufliegendem Bleimantel 9 dargestellt. Die Wanddicke des Bleimantels wird festgelegt durch die mechanischen Anforderungen und den für die Strombelastbarkeit des Kabels erforderlichen Querschnitt. Die Wanddicke des Bleimantels herkömmlicher Bleimantelkabel beträgt zwischen 5 und 10 % des Außendurchmessers des Bleimantels.FIG. 2 shows a conventional cable with a cable core 4 in the left half of the figure and a lead jacket 9 resting on the cable core 4. The wall thickness of the Lead sheath is determined by the mechanical requirements and for the Current carrying capacity of the cable required cross section. The wall thickness of the lead jacket conventional lead sheathed cable is between 5 and 10% of the outside diameter of the Lead jacket.

Die Wellung des Mantels 10 nach der Lehre der Erfindung ( rechte Hälfte der Figur 2 ) ist so ausgestaltet, daß der Außendurchmesser Da sowie der Innendurchmesser Di dem Außendurchmesser und dem Innendurchmesser des Bleimantels 9 entsprechen, d. h. der Mantel 10 ersetzt den Bleimantel 9, ohne daß die geometrischen Abmessungen geändert werden müssen. Ein mit dem erfindungsgemäßen Mantel 10 versehenes Kabel kann also wie das bekannte Bleimantelkabel in Kabelkanäle eingezogen werden und dabei ein bisher verwendetes Bleimantelkabel ersetzen. The corrugation of the jacket 10 according to the teaching of the invention (right half of Figure 2) is so designed that the outer diameter Da and the inner diameter Di the Correspond to the outer diameter and the inner diameter of the lead jacket 9, d. H. the Jacket 10 replaces lead jacket 9 without changing the geometrical dimensions have to. A provided with the jacket 10 according to the invention can thus like that known lead sheathed cables are pulled into cable ducts and thereby a previously used Replace lead sheathed cable.

Die elektrischen Eigenschaften des Mantels 10 werden dadurch erreicht, daß als Werkstoff für den Mantel eine Kupferlegierung mit 90 Gew % Kupfer und 10 Gew % Zink verwendet wird, die eine Leitfähigkeit von 44 % IACS aufweist.The electrical properties of the jacket 10 are achieved in that as a material for the jacket uses a copper alloy with 90% by weight copper and 10% by weight zinc, which has a conductivity of 44% IACS.

Die mechanische Festigkeit des Mantels 10, insbesondere die Stabilität und Beulfestigkeit wird dadurch erreicht, daß eine gegenüber den bekannten Wellrohren wesentlich geringere Welltiefe t und ein wesentlich geringerer Wellenabstand p benutzt wird, d. h. die Anzahl der Wellungen pro Längeneinheit wird wesentlich erhöht. Dadurch werden die auf das bekannte Wellrohr je Wellenberg wirkende Kräfte in viele Einzelkräfte aufgeteilt. Dies wird durch eine Erhöhung der Wellerdrehzahl im Verhältnis zur Lineargeschwindigkeit des geschweißten Rohres erreicht.The mechanical strength of the jacket 10, in particular the stability and dent resistance achieved in that a much smaller corrugation depth t compared to the known corrugated pipes and a much smaller wave spacing p is used, d. H. the number of curls per Length unit is increased significantly. This will depend on the well-known corrugated tube Forces acting at Wellenberg are divided into many individual forces. This is done by increasing the Shaft speed in relation to the linear speed of the welded pipe reached.

In der Tabelle sind die Abmessungen von drei Kabelmänteln aus der genannten Kupferlegierung aufgeführt. Da [mm] Di [mm] s [mm] p [mm] t [mm] 72,5 67,2 0,5 7,1 2,15 58,65 53,85 0,5 6,2 1,9 39,50 35,6 0,35 4,6 1,62 The table shows the dimensions of three cable sheaths made from the copper alloy mentioned. Dam] Di [mm] s [mm] p [mm] t [mm] 72.5 67.2 0.5 7.1 2.15 58.65 53.85 0.5 6.2 1.9 39.50 35.6 0.35 4.6 1.62

Claims (9)

  1. Metal sheath for electric cable with an inner diameter Di to outer diameter Da ratio of more than 0.90, characterised in that the sheath (10) consists of a longitudinal welded circular or helical corrugated metal tube, the wall thickness s of which is between 0.009 and 0.005 Da and where the distance p of two adjacent corrugation crests is between 0.12 and 0.08 Da.
  2. Metal sheath in accordance with Claim 1, characterised in that the corrugation depth is between 0.08 and 0.01 Da.
  3. Metal sheath in accordance with Claims 1 or 2, characterised in that the sheath (10) is more than 15% shorter than the smooth tube from which it was made.
  4. Metal sheath in accordance with Claims 1 to 3, characterised in that the outer diameter Da to wall thickness s ratio is more than 100.
  5. High voltage electric cable with a conductor, a filler, a plastic insulation, a semi-conducting jacket over the plastic insulation and a metal cable sheath which lies on the semi-conducting jacket, characterised in that the cable sheath is a corrugated tube (10), the inner diameter Di to outer diameter Da ratio is greater than 0.90, the wall thickness s of the metal tube is between 0.009 and 0.005 Da and the distance p of two adjacent corrugation crests is between 0.12 and 0.08 Da.
  6. High voltage electric cable in accordance with Claim 5, characterised in that a plastic outer sheath wraps the corrugated cable sheath (10).
  7. High voltage electric cable in accordance with Claims 5 or 6, characterised in that the bend radius of the cable is less than 9 Da.
  8. Process to manufacture a high voltage electric cable where a cable core is enclosed by a metal sheath, characterised in that a metal strip drawn from a supply coil is formed into a tube with a longitudinal slit, that the cable core drawn from a supply drum is fed into the still open tube with longitudinal slit, the inner diameter of the tube being greater than the outer diameter of the cable core, that the longitudinal slit of the tube is closed by arc or laser welding and that the welded tube is corrugated and in this case the corrugation valleys of the corrugated tube grip the cable core and where the corrugated tube has the following parameters. Di/Da≥0.90   s = 0.009 Da - 0.005 Da   p = 0.12 Da to 0.08 Da    Where Di is the inner diameter, Da is the outer diameter, s is the wall thickness and p the distance between two adjacent corrugation crests.
  9. Process in accordance with Claim 8, characterised in that a plastic outer sleeve is extruded over the corrugated tube.
EP97401521A 1996-07-24 1997-06-30 Metallic sheath for an electrical cable Expired - Lifetime EP0821369B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US685875 1996-07-24
US08/685,875 US5760334A (en) 1996-07-24 1996-07-24 Metallic sheath for an electric cable and method of making the same

Publications (3)

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EP0821369A2 EP0821369A2 (en) 1998-01-28
EP0821369A3 EP0821369A3 (en) 1998-12-02
EP0821369B1 true EP0821369B1 (en) 2000-10-11

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EP97401521A Expired - Lifetime EP0821369B1 (en) 1996-07-24 1997-06-30 Metallic sheath for an electrical cable

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US (1) US5760334A (en)
EP (1) EP0821369B1 (en)
JP (1) JPH1092241A (en)
CA (1) CA2211272C (en)
DE (1) DE59702441D1 (en)
GR (1) GR3035035T3 (en)

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Also Published As

Publication number Publication date
GR3035035T3 (en) 2001-03-30
DE59702441D1 (en) 2000-11-16
EP0821369A3 (en) 1998-12-02
JPH1092241A (en) 1998-04-10
CA2211272C (en) 2005-06-28
CA2211272A1 (en) 1998-01-24
US5760334A (en) 1998-06-02
EP0821369A2 (en) 1998-01-28

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