EP0277157B1 - Selbsttragendes freileitungsseil - Google Patents

Selbsttragendes freileitungsseil Download PDF

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Publication number
EP0277157B1
EP0277157B1 EP87904832A EP87904832A EP0277157B1 EP 0277157 B1 EP0277157 B1 EP 0277157B1 EP 87904832 A EP87904832 A EP 87904832A EP 87904832 A EP87904832 A EP 87904832A EP 0277157 B1 EP0277157 B1 EP 0277157B1
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EP
European Patent Office
Prior art keywords
self
composite elements
transmission lines
cable
cross
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.)
Revoked
Application number
EP87904832A
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German (de)
English (en)
French (fr)
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EP0277157A1 (de
Inventor
Othmar Voser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kupferdraht-Isolierwerk AG Wildegg
Original Assignee
Kupferdraht-Isolierwerk AG Wildegg
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Publication date
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Application filed by Kupferdraht-Isolierwerk AG Wildegg filed Critical Kupferdraht-Isolierwerk AG Wildegg
Priority to AT87904832T priority Critical patent/ATE87120T1/de
Publication of EP0277157A1 publication Critical patent/EP0277157A1/de
Application granted granted Critical
Publication of EP0277157B1 publication Critical patent/EP0277157B1/de
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H01B5/08—Several wires or the like stranded in the form of a rope
    • H01B5/10—Several wires or the like stranded in the form of a rope stranded around a space, insulating material, or dissimilar conducting material

Definitions

  • the invention relates to a self-supporting overhead line cable with a plurality of metallic wires stranded in layers and at least one strain relief element made of a plurality of reinforcing fibers arranged in the manner of a strand, the reinforcing fibers being impregnated with a binding material and forming a composite element.
  • An overhead line cable of this type is known from European Patent No. 25 461.
  • the metallic wires and the strain relief element are each arranged in an independent cross section.
  • the strain relief element consists of synthetic fibers which run approximately parallel to one another and are surrounded by a protective sheath, this protective sheath simultaneously enclosing the metallic wires and establishing the connection between the two cross sections.
  • the protective jacket is also necessary to protect the synthetic fibers from ultraviolet rays, for example as a result of sunlight.
  • the synthetic fibers are impregnated with a binder material, for example a natural resin, which resin is said to disintegrate into powder when overused.
  • a binder material for example a natural resin, which resin is said to disintegrate into powder when overused.
  • overhead line cables of this type are a sheathing for connecting the strain relief element to the metallic wires need, the structure is complicated and time-consuming. In practice, they are mainly used for special applications, for example as transmission lines for control signals, but are not particularly suitable for high-voltage overhead lines because of the high manufacturing costs. In the case of high-voltage overhead lines, there is also a demand for an optimal ratio between the total cross-section of the overhead line cable and the cross-sectional area available for power transmission.
  • the cables used for high-voltage overhead lines today mostly consist of a combination of steel and aluminum wires or of high-strength aluminum alloys.
  • the aluminum wires are used because of their low weight and the relatively good conductivity. Since they have a low tensile strength, overhead line ropes made of pure aluminum wires have to be reinforced with steel wires, which, however, considerably increase the weight of such overhead line ropes. Heavy ropes require reinforced masts.
  • the steel wires are also not suitable for power lines and are susceptible to corrosion. The use of two different metallic materials increases the risk of corrosion. Due to the dense population, it is exceptional today difficult to find suitable routes for overhead lines. Due to the increasing demand for electricity, new routes should be built, which is difficult for the reasons mentioned.
  • the overhead line rope according to the invention has essentially the same structure as an overhead line rope made of steel and aluminum wires or, for example, the aluminum alloy Aldrey. Purely aluminum wires are expediently used for the conductors, since these cost represent the cheapest solution. Depending on the application, wires made of copper or another conductive material can also be used.
  • the strain relief elements consist of composite elements which consist of reinforcing fibers embedded in binding material, preferably a curable synthetic resin. In principle, all fibers which can be used in composite materials can be used as reinforcing fibers. Fibers made from aromatic polyamides, glass fibers or so-called Kevlar fibers have proven particularly suitable.
  • These fibers are arranged in a strand-like manner and approximately parallel to one another and embedded in a hardened reactive resin in such a way that a rod-shaped element with a solid structure and a fixed cross section is formed.
  • the cross-sectional shape of these composite elements is determined by the desired type of reinforcement of the overhead line cable according to the invention.
  • a particularly simple manufacture of the overhead line cable according to the invention is possible if the composite elements serving as strain relief elements have the same cross-sectional area and shape as the metallic wires.
  • Such composite elements can be stranded with the metallic wires without difficulty, the number of composite elements embedded between the metallic wires being determined by the desired tensile strength of the overhead line cable.
  • the composite elements Due to the incorporation of the fibers in hardened synthetic resin, the composite elements have a dimensionally stable cross-section, which cannot be compressed by the metallic wires during stranding. In contrast to previous tests with strain relief elements made of reinforcing fibers, this gives the possibility of producing a dimensionally stable overhead line cable without additional measures being necessary.
  • the overhead line rope formed in this way can be clamped at the ends with the known devices, since the strain relief elements are arranged between the conductors and are spirally stranded with them.
  • the composite elements point as Strain relief elements compared to those made of steel depending on the selected fiber material the factor 1.5 to 4 less weight. With the same tensile strength of the relief elements, the weight and thus the conductive cross section of the metallic wires can be increased.
  • the arrangement with a waveguide in the core is easy to manufacture and is used in particular as an earth rope. If necessary, an optical cable can be pulled into the waveguide, which is freely movable in relation to the metallic wires.
  • the optical cable is not a component the supporting structure and is therefore well protected against deformation.
  • Spiral-stranded overhead line cables according to the invention have an approximately 70% higher transmission capacity than conventional aluminum steel cables of the same weight per unit length. Compared to the known bundled ropes with a reinforcing element as the core, they have a much smaller diameter with the same conductive cross section. This makes it possible to transmit higher outputs on existing routes when using the ropes according to the invention. With the same transmission performance, an overhead line cable of the type according to the invention becomes lighter, and the associated supporting masts and guy lines can be made lighter and simpler, or larger spans can be provided between the individual masts. As a result, the construction costs of such overhead lines are reduced and the further advantage that smaller masts can be better fitted into the landscape.
  • the spiral stranded overhead line cable shown in Figure 1 consists of metallic wires 1, which are stranded in three layers 7, 8 and 9.
  • the core 2 is also formed from a metallic wire 1.
  • composite elements 3 and 4 are arranged in the cavities 5, between the first layer 7 and the second layer 8 and in the cavities 6 between the second layer 8 and the third layer 9.
  • composite elements 3 and 4 are arranged in the cavities 5, between the first layer 7 and the second layer 8 and in the cavities 6 between the second layer 8 and the third layer 9.
  • composite elements 3 and 4 are arranged in the cavities 5, between the first layer 7 and the second layer 8 and in the cavities 6 between the second layer 8 and the third layer 9.
  • These composite elements 3, 4 consist of polyaramid fibers, which are embedded in a hardened synthetic resin.
  • an unsaturated polyester resin dissolved in styrene is used as the synthetic resin.
  • Such resins are known under the name Leguval from Bayer.
  • the composite elements 3, 4 have a circular cross section, which is firm and dimensionally stable.
  • the metallic wires 1 of all layers 7, 8, 9 and the core 2 have a diameter of 3.36 mm and consist of pure aluminum.
  • the overhead line cable shown consists of 37 metallic wires 1, which results in a conductive cross section of 328 mm2.
  • the composite elements 3 have a diameter of 1.17 mm and the composite elements 4 of 1.07 mm.
  • the copper cross-section with the same conductance value in this example, which is important for the comparison of overhead line ropes and the calculation of the transmission power, is 201 mm2.
  • the conductive cross section of the overhead line cable according to FIG. 1 is thus 69% larger than that of the conventional steel / aluminum cable. If overhead cables of the conventional type on an existing route are replaced by ropes according to FIG. 1, a correspondingly higher power can be transmitted on the same route.
  • Figure 2 shows a cross section through an overhead line with metallic wires 1 and composite elements 10, which are also arranged between the metallic wires 1 and have the same cross section as these.
  • Polyaramide fibers which are processed together with the hardened synthetic resin to form the rod-shaped composite element 10 with a circular cross-section, also serve as reinforcement elements.
  • These composite elements 10 are as dimensionally stable as the metallic wires 1 and can therefore be stranded with these metallic wires 1 in a known manner without difficulty.
  • Two composite elements 10 are arranged in the first layer and three in the second layer. There are no composite elements 10 in the third and outer layer 9, since the material used is not resistant to ultraviolet radiation.
  • the overhead line rope shown is formed from metallic wires made of pure aluminum with a diameter of 3.54 mm, the rope contains 32 metallic wires 1.
  • the copper cross-section of the same conductance value for this rope is 193 mm2.
  • the rope also has a weight of 912 kg / km.
  • the conductive cross section of the overhead line cable according to FIG. 2 is therefore also substantially larger here, namely 63%. It is obvious that even in this embodiment according to the invention, significantly higher outputs can be transmitted with the same weight load on a route.
  • the rope according to the invention has a higher one Strength by the breaking strength being approx. 55% higher than with the steel-aluminum rope mentioned. This results in the possibility of reducing the distance between support masts and / or the sag of the overhead line cables with increased transmission power.
  • the overhead line cable shown in cross section in FIG. 3 shows an embodiment which can be produced on a stranding machine with a limited number of wire feeds. If, for example, the stranding machine has only 48 wire feeds, a rope according to FIG. 1 cannot be produced in one operation.
  • the overhead line cable according to FIG. 3 has a total of four composite elements 10 as core 2 and in the inner layer 7, which have the same cross-section as the metallic wires 1. In the cavities 5 of the inner layer 7, six additional composite elements 3 are inserted with a smaller cross section and stranded with the wires 1. This combination of thirty-three wires 1, four composite elements 10 and six composite elements 3 can be produced in one operation on a stranding machine with 48 wire feeds.
  • the composite elements 10 and 3 are also made of polyaramide fibers, which are embedded in a hardened synthetic resin. Depending on the needs, different combinations of arrangements of the different cross sections of the composite elements 3 and 10 can be selected. If you compare this rope with overhead line ropes of a conventional type, you can see that a steel-aluminum rope with a copper cross-section of the same conductance value has a weight per km is about 64% higher. With a rope made of Aldrey, a well-known and frequently used aluminum alloy with a copper cross section with the same conductance, the weight per km is still approx. 53% higher. For the same transmission performance, routes that are equipped with ropes of the conventional type must be equipped with much more massive masts and stronger guy lines.
  • the composite elements 3 and 10 are completely surrounded by metallic wires 1 and thereby protected from the action of harmful ultraviolet radiation. If necessary, additional layers of wire can be applied to the rope shown here and stranded into a larger rope.
  • the construction of the overhead line rope shown in FIG. 4 corresponds to the overhead line rope according to FIG. 2 in the construction of the metallic wires 1 and the composite elements 10.
  • the inner layers in the rope shown are replaced by a hollow body 16 which has a cavity 17.
  • the rope has an outer layer 15 of metallic wires 1, and the composite elements 10 are all arranged in the inner layer 9 here.
  • the rope shown is used in particular as a grounding rope. If necessary, optical conductors can be inserted into the cavity 17 of the hollow body 16. These optical conductors advantageously have a waveform, as a result of which any changes in length or deformations of the overhead line cable can be compensated for.
  • This version is a particularly simple and inexpensive combination of an overhead line cable with metallic wires and an integrated optical conductor.

Landscapes

  • Ropes Or Cables (AREA)
  • Non-Insulated Conductors (AREA)
  • Communication Cables (AREA)
  • Insulated Conductors (AREA)
  • Suspension Of Electric Lines Or Cables (AREA)
EP87904832A 1986-08-14 1987-08-13 Selbsttragendes freileitungsseil Revoked EP0277157B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87904832T ATE87120T1 (de) 1986-08-14 1987-08-13 Selbsttragendes freileitungsseil.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3270/86 1986-08-14
CH3270/86A CH671647A5 (enrdf_load_stackoverflow) 1986-08-14 1986-08-14

Publications (2)

Publication Number Publication Date
EP0277157A1 EP0277157A1 (de) 1988-08-10
EP0277157B1 true EP0277157B1 (de) 1993-03-17

Family

ID=4252354

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87904832A Revoked EP0277157B1 (de) 1986-08-14 1987-08-13 Selbsttragendes freileitungsseil

Country Status (5)

Country Link
EP (1) EP0277157B1 (enrdf_load_stackoverflow)
AT (1) ATE87120T1 (enrdf_load_stackoverflow)
CH (1) CH671647A5 (enrdf_load_stackoverflow)
DE (1) DE3784908D1 (enrdf_load_stackoverflow)
WO (1) WO1988001430A1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2905864A1 (en) 2013-03-11 2014-10-09 Southwire Company, Llc Hybrid conductor core
DE102014103612A1 (de) 2014-03-17 2015-09-17 Liebhart Oskar Freileitungsseil

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2675420A (en) * 1950-03-28 1954-04-13 Owens Corning Fiberglass Corp Insulated electrical conductor
GB838494A (en) * 1955-07-21 1960-06-22 James Ritchie Improvements relating to electric conductors
GB809868A (en) * 1956-07-24 1959-03-04 British Insulated Callenders An improved electric conductor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Enzyklopädic Naturwissenschaft und Technik Verlag MI, 1976, Seite 4279 *

Also Published As

Publication number Publication date
WO1988001430A1 (en) 1988-02-25
EP0277157A1 (de) 1988-08-10
DE3784908D1 (de) 1993-04-22
ATE87120T1 (de) 1993-04-15
CH671647A5 (enrdf_load_stackoverflow) 1989-09-15

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