EP0601667B1 - Elektrisches Kabel - Google Patents
Elektrisches Kabel Download PDFInfo
- Publication number
- EP0601667B1 EP0601667B1 EP19930203432 EP93203432A EP0601667B1 EP 0601667 B1 EP0601667 B1 EP 0601667B1 EP 19930203432 EP19930203432 EP 19930203432 EP 93203432 A EP93203432 A EP 93203432A EP 0601667 B1 EP0601667 B1 EP 0601667B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- jacket
- conducting
- earthing
- cable
- arranged around
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B9/00—Power cables
- H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
Definitions
- the invention relates to an electric cable comprising:
- the electric cable according to the invention is characterized by a sealing jacket arranged around said electrically conducting earthing jacket which sealing jacket expands under the influence of water;
- the sealing jacket arranged around the electrically conducting earthing jacket serves the purpose of ensuring a tight sealing of the cable structure against the penetration of water. Under critical conditions, e.g. conditions under which the sealing jacket comes in contact with penetrating water the jacket builts up an additional barrier preventing the water from further penetrating into the cable structure due to the fact that the jacket expands under the influence of the penetrated water.
- the electrically conducting outer jacket which can be further covered by a mechanically protecting and electrically insulating protective jacket can for instance consist of aluminium foil.
- the outer jacket must assume the same electrical potential as the electrically conducting earthing jacket.
- the sealing jacket present between the two said jackets and expanding under the influence of water has in this respect more or less conducting properties. In conditions where short-circuiting occurs, a comparatively high voltage difference can occur between the earthing jacket and the outer jacket whereby breakdown can result. This can result in local charring or other degeneration of the expandable sealing jacket.
- the expandable sealing jacket has to be retained to ensure the longitudinal water-tightness of the electrical cable in certain conditions.
- the electrical conducting means which place the earthing jacket and the outer jacket locally in mutual contact.
- These conducting means can be embodied in diverse ways, in particular as electrically conducting spacer elements between the earthing jacket and the outer jacket.
- a very simple embodiment is that in which the conducting means comprise a conducting wire extending through the sealing jacket. From a production technology viewpoint the most simple and best controllable embodiment is that wherein the wire is wound helically.
- a specific embodiment has the feature that the earthing jacket comprises at least one helically wound conductor and that the pitch of the conducting wire differs from the pitch of the at least one conductor of the earthing jacket.
- a preferred embodiment of this type has the special feature that the earthing jacket comprises a number of mutually adjacent helically wound conducting wires and that the pitch thereof is opposed to the pitch of the said conducting wire. This ensures in all conditions that the said conducting wire which must bring about the contact between the earthing jacket and the outer jacket can never be pressed inward and assume a position between the helically wound conducting wires of the earthing jacket.
- the sealing jacket is arranged by extrusion.
- the conducting wire in particular a copper wire, lies prior to the extrusion process against the outer surface of the earthing jacket.
- the surface of the wire located radially the furthest outward remains at least locally exposed.
- a strip of aluminium foil is then laid in lengthwise direction against the cable and closed with adhesive round the cable with a longitudinal seam with overlapping edge zones, a local contact between the earthing jacket and the outer jacket can be ensured due to the light pressure which is used in one movement for arranging the aluminium foil immediately after the extrusion process.
- MDPE medium density polyethylene
- HDPE high density polyethylene
- the cable can be finished by arranging a protective jacket round the electrically conducting outer jacket.
- the cable according to the invention comprises an electrically conducting core 1, a first semi-conducting jacket 2 arranged therearound, an insulating jacket 3 arranged therearound, a second semi-conducting jacket 4 arranged therearound, an electrically conducting earthing jacket 5, 6 arranged therearound, a sealing jacket 8 arranged therearound which expands under the influence of water, an electrically conducting outer jacket 9 arranged therearound and a copper wire 7 which is embedded in the sealing jacket 8 and which with its inner surface makes contact with the earthing jacket 5, 6 and with its outer surface makes contact with the electrically conducting outer jacket 9 consisting of aluminium foil.
- the earthing jacket comprises a number of mutually adjacent, helically wound wires 10 together forming a cylindrical jacket and, arranged therearound, a strip 6 of copper foil wound with opposing pitch. It is noted that if desired this strip 6 of copper foil can be omitted.
- the copper wire 7 has a pitch opposed to that of the wires 10.
- the sealing jacket 8 expandable under the influence of water is arranged on the cable by extrusion during the production stage in which the cable still consists of the electrically conducting core 1 and the jackets 2, 3, 4, 5, 6 and the conducting wire 7.
Landscapes
- Insulated Conductors (AREA)
Claims (6)
- Elektrisches Kabel mit:einem elektrisch leitfähigen Kern (1),einem ersten halbleitenden Mantel (2), der drumherum angeordnet ist,einem Isoliermantel (3), der um den ersten halbleitenden Mantel (2) herum angeordnet ist,einem zweiten halbleitenden Mantel (4), der um den Isoliermantel (3) herum angeordnet ist,einem elektrisch leitfähigen Erdungsmantel (5, 6), der um den zweiten halbleitenden Mantel (4) herum angeordnet ist,gekennzeichnet durcheinen Dichtungsmantel (8), der um den elektrisch leitfähigen Erdungsmantel (5, 6) herum angeordnet ist, wobei der Dichtungsmantel sich unter dem Einfluß von Wasser aufdehnt,einen elektrisch leitfähigen Außenmantel (9), der um den Dichtungsmantel (8) herum angeordnet ist, undelektrisch leitfähige Mittel (7), die den Erdungsmantel (5, 6) und den Außenmantel (9) lokal in gegenseitigen Kontakt bringt.
- Kabel nach Anspruch 1,
dadurch gekennzeichnet, daß die leitfähigen Mittel einen leitenden Draht (7) aufweisen, der sich durch den Dichtungsmantel (8) erstreckt. - Kabel nach Anspruch 2,
dadurch gekennzeichnet, daß der Draht (7) wendelförmig gewunden ist. - Kabel nach Anspruch 3,
dadurch gekennzeichnet, daß der Erdungsmantel (5, 6) zumindest einen wendelförmig gewickelten Leiter (5, 6) aufweist und daß der Versatz des leitenden Drahtes (7) sich von dem Versatz des zumindest einen Leiters (6) des Erdungsmantels (5, 6) unterscheidet. - Kabel nach Anspruch 3,
dadurch gekennzeichnet, daß der Erdungsmantel eine Anzahl von gegenseitig aneinandergrenzenden wendelförmig gewickelten Leitungsdrähten aufweist und daß ihr Versatz dem Versatz des Leitungsdrahtes entgegengesetzt ist. - Kabel nach Anspruch 2,
dadurch gekennzeichnet, daß der Dichtungsmantel (7) durch Extrusion angeordnet wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9202135 | 1992-12-10 | ||
NL9202135A NL9202135A (nl) | 1992-12-10 | 1992-12-10 | Elektrische kabel. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0601667A1 EP0601667A1 (de) | 1994-06-15 |
EP0601667B1 true EP0601667B1 (de) | 1996-10-16 |
Family
ID=19861613
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19930203432 Expired - Lifetime EP0601667B1 (de) | 1992-12-10 | 1993-12-07 | Elektrisches Kabel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0601667B1 (de) |
DE (1) | DE69305481T2 (de) |
NL (1) | NL9202135A (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO179305C (no) * | 1994-04-05 | 1996-09-11 | Nkt Cables As | Kraftkabel med aksiell og radiell vanntetning |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1482950A (fr) * | 1966-04-12 | 1967-06-02 | Jeumont Schneider | Câble électrique basse tension |
DE7709329U1 (de) * | 1977-03-22 | 1978-06-15 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Geschirmtes, kunststoffisoliertes Starkstromkabel mit Schichtenmantel |
DK489080A (da) * | 1980-11-14 | 1982-05-15 | Jps Elteknik A S | Hoejspaendingskabel |
FR2503441B1 (fr) * | 1981-04-07 | 1986-06-27 | Fabrication Cables Elect Cie G | Nouveau cable electrique |
-
1992
- 1992-12-10 NL NL9202135A patent/NL9202135A/nl not_active Application Discontinuation
-
1993
- 1993-12-07 DE DE1993605481 patent/DE69305481T2/de not_active Expired - Fee Related
- 1993-12-07 EP EP19930203432 patent/EP0601667B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
NL9202135A (nl) | 1994-07-01 |
DE69305481T2 (de) | 1997-02-27 |
DE69305481D1 (de) | 1996-11-21 |
EP0601667A1 (de) | 1994-06-15 |
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