GB1592625A - Screen-protected and plastics-insulated power cable - Google Patents
Screen-protected and plastics-insulated power cable Download PDFInfo
- Publication number
- GB1592625A GB1592625A GB5724/78A GB572478A GB1592625A GB 1592625 A GB1592625 A GB 1592625A GB 5724/78 A GB5724/78 A GB 5724/78A GB 572478 A GB572478 A GB 572478A GB 1592625 A GB1592625 A GB 1592625A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- power cable
- metal foil
- conductive layer
- plastics
- 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
Links
- 239000002184 metal Substances 0.000 claims abstract description 35
- 229910052751 metal Inorganic materials 0.000 claims abstract description 35
- 239000011888 foil Substances 0.000 claims abstract description 33
- 239000000853 adhesive Substances 0.000 claims description 15
- 230000001070 adhesive effect Effects 0.000 claims description 15
- 229920003023 plastic Polymers 0.000 claims description 14
- 239000004033 plastic Substances 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 5
- 239000005977 Ethylene Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- -1 polyethylene Polymers 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 102100025890 Complement C1q tumor necrosis factor-related protein 3 Human genes 0.000 claims description 2
- 101000933673 Homo sapiens Complement C1q tumor necrosis factor-related protein 3 Proteins 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims description 2
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 2
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 2
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 2
- 239000004800 polyvinyl chloride Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract 1
- 230000035515 penetration Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
-
- 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
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
Landscapes
- Insulated Conductors (AREA)
- Communication Cables (AREA)
- Cable Accessories (AREA)
Abstract
In order reliably to protect a plastic-insulated heavy-current cable which is provided with a wire screen (6) against the ingress of moisture, a layered sheath is provided whose metal foil (5), which prevents the permeation of moisture, is arranged between the outer conductive layer (4) and the screen (6). As a result of this arrangement, the metal foil is well protected against damage. Since the wire screen is provided for screening, the metal foil is intended only to prevent the permeation of moisture. The metal foil can thus be of suitably thin construction. <IMAGE>
Description
(54) SCREEN-PROTECTED AND PLASTICS-INSULATED
POWER CABLE
(71) We, SIEMENS AKTIENGESELL
SCHAFT, a German company, of Berlin and
Munich, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to a screen-protected and plastics-insulated power cable.
It is known to provide electrical cables with cable sheaths which are made of plastics material, particularly polyethylene, and which have an inner lining made of thin metal foil to prevent inward permeation of moisture. The metal foil is formed from spun-on longitudinally moving metal tape into tubular form, the tape having overlapping edges and being coated on one or both sides with an adhesive or an adhesionpromoting co-polymer. The tape is welded in the region of its edges and also to the plastics material of the adjacent sheath.
The sheath structure employed mainly for communication cables is known as a "layer sheath" and it is also known to provide such a structure for plastics-insulated power cables, in which case the metal foil is made thicker so as to provide a dual function i.e.
prevention of moisture penetration and also to provide an electrical screen for the cable.
When power cables are required to have a screen made from wires, such a sheath structure cannot readily be adopted.
The present invention has been developed primarily, though not exclusively, with a view to providing a power cable having a plastics-insulated cable core, and an electrical screen (external to the core) made-up from metal wires, in which the insulated core is protected against moisture penetration.
According to the invention there is provided a power cable having a plasticsinsulated cable core, an electrically conductive layer surrounding said core and within an outer plastics sheath, an electrical screen built-up from metal wires and arranged between said sheath and said conductive layer, and a tubular metal foil arranged between said conductive layer and said electrical screen and secured to said conductive layer by adhesive or by welding.
In a power cable according to the invention, the thin metal foil preventing the permeation of moisture into the cable core is not, as in the case of conventional constructions, disposed on the inner side of the cable sheath, but inwardly of the screen and between the latter and the conductive layer (which surrounds the cable core.) Thereby, damage such as might occur if the foil should be applied to the outer surface of the screen is prevented, and simultaneously reliable protection of the cable insulation against penetrating moisture is obtained. Since the tubular metal foil provided for this purpose is only intended to prevent the permeation of moisture, it may be designed to be correspondingly thin.Preferably, it is coated on its inner surface with a per se known electrically conductive adhesive, for example a conductive copolymer based on ethylene, so as to achieve intimate welding to the conductive layer disposed thereunder. On its outer surface, the metal foil may also be provided with an electrically conductive plastics coating which then assumes the function of affording a predetermined cushioning or protective effect relative to the wires of the screen which are applied on the metal foil.
Simultaneously, due to the conductivity of this outer layer, a voltage difference between the outer conductive layer and the screen may be avoided.
One embodiment of the power cable according to the invention will now be described in detail, by way of example only, with reference to the accompanying drawing in which: Figure I is a transverse sectional view of the power cable; and
Figure 2 is an enlarged view of a detail of the power cable as shown in Figure 1.
Referring now to the drawing, there is shown a screen-protected and plastics-insulated power cable. The power cable comprises a plastics-insulated cable core in the form of a multi-wire electrical conductor 1 having an inner conductive layer 2, and an electrically insulating covering 3 of plastics material, preferably polyethylene or crosslinked polyethylene. Although not shown, the insulated cable core may comprise a number of cable corcs stranded together.
An outer conductive layer 4 surrounds the insulation 3 and is made of a plastics-based material. An electrically insulating outer sheath for the cable is formed by a cable sheath 8 made of, for example, polyvinyl chloride, polyethylene or any suitable plastics material conventionally employed in making electrical cable sheaths.
Arranged between the sheath 8 and the conductive layer 4 is a tubular metal foil 5.
The metal foil 5 is formed into a tube, from longitudinally or spun-fed material, having overlapping edges which are secured to each other e.g. by adhesive or by welding.
As will be seen in Figure 2, the inner surface, and the outer surface, of the metal foil S are each provided with a coating of an electrically conductive adhesive. The coating may comprise a conductive copolymerisate of ethylene. The tubular foil 5 is secured to the conductive layer 4 disposed thereunder, e.g. by welding.
The power cable is provided with an electrical screen in the form of a screen 6 which is built-up from metal wires, preferably copper wires. The screen 6 may be of generally conventional type as employed in power cables. As will be seen in Figure 2, the screen 6 is arranged radially outwardly of the tubular metal foil 5 and radially inwardly of the sheath 8. The coating provided on the outer surface of the tubular foil 5 engages the inner surface of the screen 6 and may serve to provide a predetermined cushioning or protective effect relative to the wires of the screen 6.
The screen 6 may be stranded-on the metal foil 5 from copper wires, and is surrounded with a contact helix or spiral 7 made of copper tape or band. Instead of a strandedon wire screen, it would also be possible to provide a screen built-up from longitudinally-moving or oscillatingly stranded wires.
WHAT WE CLAIM IS: 1. A power cable having a plastics-insulated cable core, an electrically conductive layer surrounding said core and within an outer plastics sheath, an electrical screen built-up from metal wires and arranged between said sheath and said conductive layer, and a tubular metal foil arranged between said conductive layer and said electrical screen and secured to said conductive layer by adhesive or by welding.
2. A power cable according to claim 1, in which the tubular metal foil is adhesively secured to said conductive layer and is coated on its inner surface, or on its outer surface and its inner surface, with a coating of a plastics-based electrically conductive adhesive.
3. A power cable according to claim 2, in which said electrically conductive adhesive comprises an electrically conductive co-polymer based on ethylene.
4. A power cable according to any one of the preceding claims, in which the tubular metal foil is formed into a tube, from longitudinally or spun-fed material, having overlapping edges which are secured to each other by adhesive or by welding.
5. A power cable according to any one of the preceding claims, in which said cable core comprises a plurality of cores stranded together.
6. A power cable according to claim 1, and substantially as hereinbefore described with reference to, and as shown in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A power cable having a plastics-insulated cable core, an electrically conductive layer surrounding said core and within an outer plastics sheath, an electrical screen built-up from metal wires and arranged between said sheath and said conductive layer, and a tubular metal foil arranged between said conductive layer and said electrical screen and secured to said conductive layer by adhesive or by welding.
2. A power cable according to claim 1, in which the tubular metal foil is adhesively secured to said conductive layer and is coated on its inner surface, or on its outer surface and its inner surface, with a coating of a plastics-based electrically conductive adhesive.
3. A power cable according to claim 2, in which said electrically conductive adhesive comprises an electrically conductive co-polymer based on ethylene.
4. A power cable according to any one of the preceding claims, in which the tubular metal foil is formed into a tube, from longitudinally or spun-fed material, having overlapping edges which are secured to each other by adhesive or by welding.
5. A power cable according to any one of the preceding claims, in which said cable core comprises a plurality of cores stranded together.
6. A power cable according to claim 1, and substantially as hereinbefore described with reference to, and as shown in the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE7709329U DE7709329U1 (en) | 1977-03-22 | 1977-03-22 | Shielded, plastic-insulated power cable with layered jacket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1592625A true GB1592625A (en) | 1981-07-08 |
Family
ID=6677040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5724/78A Expired GB1592625A (en) | 1977-03-22 | 1978-02-13 | Screen-protected and plastics-insulated power cable |
Country Status (6)
| Country | Link |
|---|---|
| CH (1) | CH625903A5 (en) |
| DE (1) | DE7709329U1 (en) |
| FR (1) | FR2385194A1 (en) |
| GB (1) | GB1592625A (en) |
| IT (1) | IT1093800B (en) |
| SE (1) | SE7802996L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113096876A (en) * | 2021-03-09 | 2021-07-09 | 安徽渡江电缆集团有限公司 | Photovoltaic direct current cable that can be used to roof directly to lay |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2465301A1 (en) * | 1979-09-07 | 1981-03-20 | Jeumont Schneider | High tension electric cable - has screening wires embedded in sealing material to ensure water tightness even after local damage |
| JPS59125018U (en) * | 1983-02-07 | 1984-08-23 | 古河電気工業株式会社 | Rubber, plastic insulated power cable |
| DE3307038A1 (en) * | 1983-02-28 | 1984-08-30 | The Furukawa Electric Co., Ltd., Tokio/Tokyo | Rubber-insulated or plastic-insulated heavy-current cable |
| JPH071643B2 (en) * | 1987-07-21 | 1995-01-11 | 住友電気工業株式会社 | coaxial cable |
| US4965412A (en) * | 1989-04-06 | 1990-10-23 | W. L. Gore & Associates, Inc. | Coaxial electrical cable construction |
| US5212350A (en) * | 1991-09-16 | 1993-05-18 | Cooper Industries, Inc. | Flexible composite metal shield cable |
| NL9202135A (en) * | 1992-12-10 | 1994-07-01 | Twentsche Kabelfab Bv | Electric cable. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2168192B1 (en) * | 1972-01-19 | 1974-09-13 | Cables De Lyon Geoffroy Delore | |
| FR2168959A1 (en) * | 1972-01-28 | 1973-09-07 | Gen Cable Corp | Cable electrostatic shield - for high voltage of lengthwise folded metal strip over semiconductor layer |
| FR2299793A7 (en) * | 1975-01-28 | 1976-08-27 | Alsacienne Aluminium | Metal screen for power transmission cables - with good adhesion between layers and which is shock resistant |
-
1977
- 1977-03-22 DE DE7709329U patent/DE7709329U1/en not_active Expired
-
1978
- 1978-02-07 CH CH131778A patent/CH625903A5/en not_active IP Right Cessation
- 1978-02-13 GB GB5724/78A patent/GB1592625A/en not_active Expired
- 1978-03-10 IT IT21080/78A patent/IT1093800B/en active
- 1978-03-14 FR FR7807365A patent/FR2385194A1/en active Pending
- 1978-03-15 SE SE7802996A patent/SE7802996L/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113096876A (en) * | 2021-03-09 | 2021-07-09 | 安徽渡江电缆集团有限公司 | Photovoltaic direct current cable that can be used to roof directly to lay |
Also Published As
| Publication number | Publication date |
|---|---|
| DE7709329U1 (en) | 1978-06-15 |
| FR2385194A1 (en) | 1978-10-20 |
| CH625903A5 (en) | 1981-10-15 |
| IT1093800B (en) | 1985-07-26 |
| SE7802996L (en) | 1978-09-23 |
| IT7821080A0 (en) | 1978-03-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |