WO2017115111A1 - Sectorial aluminum multipolar cable and relative manufacturing process - Google Patents

Sectorial aluminum multipolar cable and relative manufacturing process Download PDF

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Publication number
WO2017115111A1
WO2017115111A1 PCT/IB2015/060052 IB2015060052W WO2017115111A1 WO 2017115111 A1 WO2017115111 A1 WO 2017115111A1 IB 2015060052 W IB2015060052 W IB 2015060052W WO 2017115111 A1 WO2017115111 A1 WO 2017115111A1
Authority
WO
WIPO (PCT)
Prior art keywords
aluminum
conductors
sectorial
multipolar cable
forming
Prior art date
Application number
PCT/IB2015/060052
Other languages
French (fr)
Inventor
Domenico BARBIERI
Original Assignee
Aster Consult Srl
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aster Consult Srl filed Critical Aster Consult Srl
Priority to PCT/IB2015/060052 priority Critical patent/WO2017115111A1/en
Publication of WO2017115111A1 publication Critical patent/WO2017115111A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
    • H01B1/023—Alloys based on aluminium
    • 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
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/006—Constructional features relating to the conductors
    • 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
    • H01B9/026—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of longitudinally posed wire-conductors

Definitions

  • the present invention relates to a sectorial aluminum multipolar cable.
  • the present invention relates to a sectorial aluminum multipolar cable, usable as a conductor for the realization of the electrical lines.
  • the present invention is also related to a manufacturing process of a sectorial aluminum multipolar cable .
  • the electric lines are used for transferring electrical energy between two generic points, such as, for example, the point at which it is produced and the point of use.
  • they are realized by means of metallic materials, in the form of cables, which have, among their essential characteristics, a high specific electrical conductivity, i.e. a high ability to conduct electrical current, defined as:
  • the other main characteristics for the conductors are the mechanical properties (tensile strength, modulus of elasticity, elongation, hardness, etc.), technological (malleability, ductility) and thermal properties (thermal conductivity, thermal expansion coefficient) .
  • the most suitable material for the specific case will be the material which best combines these properties.
  • the metallic materials like silver, gold, copper and aluminum, having very specific low resistivity, are the materials that combine the best of these features.
  • Gold and silver as a result of their lower availability in the ground, have rather high costs which limit the application only to special cases, such as in the aerospace field.
  • the copper is the material most widely used due to the high electrical conductivity, the excellent technological properties (high drawability even in very thin wires, ease of hot and cold rolling, weldability, etc. ) , the high mechanical characteristics, the oxidation resistance and ease of reuse. In contrast, however, in recent years there has been an excessive increase of the purchase price due to the increase of proportion of the production costs.
  • the configuration of the electrical conductors provides, in the case of unipolar conductors, a metallic central part formed by copper or aluminum wires and an outer insulating sheath in plastic material, while, in the case of multipolar conductors, more unipolar wires within a protective outer sheath.
  • Multipolar conductors are, for example, the bipolar, three-pole and four-pole cables .
  • Purpose of the present invention is to provide a sectorial aluminum multipolar cable and a manufacturing process of a sectorial aluminum multipolar cable, of the flexible type with reduced vacuum internal parts, thus having characteristics such as to overcome the limits that still affect the sectorial aluminum multipolar cable and the manufacturing process previously described with reference to the known technique.
  • a sectorial aluminum multipolar cable is provided, as defined in claim 1.
  • a process for manufacturing a sectorial aluminum multipolar cable is provided, as defined in claim 6.
  • FIG. 1 shows a schematic sectional view of a sectorial aluminum multipolar cable, according to the prior art ;
  • FIG. 2 shows a schematic sectional view of a sectorial aluminum multipolar cable, according to the invention .
  • the sectorial aluminum multipolar cable 100 comprises an outer insulating sheath 101, a ring 102 comprising conductive wires, and internally four conductor unipolar wires 103 adjacent to each other and grouped inside insulating sheaths 104.
  • each conductor 103 is arranged at 90° with respect to the adjacent conductor 103.
  • the ring 102 is embedded within the outer sheath 101.
  • each conductor 103 is a circular sector having the same area .
  • the sheaths 104 of each conductor 103 are perfectly adjacent to one another and to the outer sheath 101.
  • the conductors 103 and the sheaths 104 are compacted so as to reduce the empty spaces visible in the multipolar cable of Figure 1.
  • the conductors 103 and the ring 102 are made of aluminum.
  • the sectorial aluminum multipolar cable comprises three conductors 103 provided with sheaths 104, arranged at 120° from each other.
  • the sectorial aluminum multipolar cable comprises two conductors 103 provided with sheaths 104, arranged at 180° from each other.
  • the present invention is also related to a process for manufacturing a sectorial aluminum multipolar cable.
  • the process for manufacturing a cable 100 comprising a step of forming at least one outer insulating sheath 101 and a step of forming at least two metal conductors 103 grouped inside insulating sheaths 104, also comprises a step of forming the first conductors 103 having equal circular sector sections and a step of forming said sheaths 104 adjacent to the outer sheath 101 and between them.
  • the step of forming the conductor 103 having equal circular sector sections comprises using prespirraling head suitable to the formation of a group of conductors 103 arranged at 90° or 120° or 180° from the adjacent group, depending on whether the multipolar cable is quadripolar or tripolar or bipolar.
  • the prespirraling heads are equipped with materials, such as thermoplastic polymers or elastomers, suitable to compact the material in production without stressing it.
  • the step of forming the conductors 103 having equal circular sector sections comprises completely eliminating the empty points between the conductors 103.
  • the step of forming the conductors 103 having equal circular sector sections comprises adhering the insulating material to the conductor in order do not create air bubbles inside that cause gaps on the insulator itself.
  • the process for manufacturing the cable 10 comprises wrapping the insulated core in order to avoid the decomposition in the final stage of forming the reel.
  • the sectorial aluminum multipolar cable and the relative manufacturing process according to the invention allow to reduce the gaps between the internal conductors .
  • Another advantage of the sectorial aluminum multipolar cable and the relative manufacturing process according to the invention is the presence of the ring of conductors in the outer sheath which increases the surface area of the conductors thereby increasing the electrical conductivity.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Insulated Conductors (AREA)

Abstract

A sectorial aluminum multipolar cable (100) comprising : - At least one outer insulating sheath (101); - At least two first metal conductors (103) grouped inside insulating sheaths (104). The first conductors (103) have circular sector sections having equal area and the sheaths (104) are adjacent to said outer sheath (101) and between them.

Description

DESCRIPTION
"Sectorial aluminum multipolar cable and relative manufacturing process"
~k ~k ~k
The present invention relates to a sectorial aluminum multipolar cable.
In particular, the present invention relates to a sectorial aluminum multipolar cable, usable as a conductor for the realization of the electrical lines.
The present invention is also related to a manufacturing process of a sectorial aluminum multipolar cable .
As it is known, the electric lines are used for transferring electrical energy between two generic points, such as, for example, the point at which it is produced and the point of use. In general, they are realized by means of metallic materials, in the form of cables, which have, among their essential characteristics, a high specific electrical conductivity, i.e. a high ability to conduct electrical current, defined as:
in where p is the specific resistivity, S is the section and 1 is the length of the cable.
So it is clear that, for a given section, to have a high conductivity it is essential that the resistivity is as low as possible.
Instead, the other main characteristics for the conductors, are the mechanical properties (tensile strength, modulus of elasticity, elongation, hardness, etc.), technological (malleability, ductility) and thermal properties (thermal conductivity, thermal expansion coefficient) .
The most suitable material for the specific case will be the material which best combines these properties. In particular, the metallic materials, like silver, gold, copper and aluminum, having very specific low resistivity, are the materials that combine the best of these features.
Gold and silver, as a result of their lower availability in the ground, have rather high costs which limit the application only to special cases, such as in the aerospace field.
Instead copper and aluminum are widely most common. The copper is the material most widely used due to the high electrical conductivity, the excellent technological properties (high drawability even in very thin wires, ease of hot and cold rolling, weldability, etc. ) , the high mechanical characteristics, the oxidation resistance and ease of reuse. In contrast, however, in recent years there has been an excessive increase of the purchase price due to the increase of proportion of the production costs.
As a result, the market has been moving towards the aluminum, remaining the only real alternative to copper for its qualities of lightness and significantly less cost (greater availability on the earth than copper) . Moreover, aluminum has excellent technological properties and resistance to atmospheric actions. The only negative aspect to consider is its electrical resistivity greater than copper (or lesser conductivity) that is generally compensated with an increase of the section.
Technically, the configuration of the electrical conductors provides, in the case of unipolar conductors, a metallic central part formed by copper or aluminum wires and an outer insulating sheath in plastic material, while, in the case of multipolar conductors, more unipolar wires within a protective outer sheath. Multipolar conductors are, for example, the bipolar, three-pole and four-pole cables .
However, for the latter type of cables, the empty spaces inside them, present both for the geometric configuration and for the manufacturing process used, represent a technological limit reducing the useful section and, consequently, the conductivity.
Purpose of the present invention is to provide a sectorial aluminum multipolar cable and a manufacturing process of a sectorial aluminum multipolar cable, of the flexible type with reduced vacuum internal parts, thus having characteristics such as to overcome the limits that still affect the sectorial aluminum multipolar cable and the manufacturing process previously described with reference to the known technique.
According to the present invention, a sectorial aluminum multipolar cable is provided, as defined in claim 1.
According to the present invention, a process for manufacturing a sectorial aluminum multipolar cable is provided, as defined in claim 6.
For a better understanding of the present invention a preferred embodiment is now described, purely as non- limiting example, with reference to the accompanying drawings, in which:
- Figure 1 shows a schematic sectional view of a sectorial aluminum multipolar cable, according to the prior art ;
- Figure 2 shows a schematic sectional view of a sectorial aluminum multipolar cable, according to the invention .
With reference to these figures, and in particular to figure 2, a sectorial aluminum multipolar cable 100 is shown, according to the invention. The sectorial aluminum multipolar cable 100 comprises an outer insulating sheath 101, a ring 102 comprising conductive wires, and internally four conductor unipolar wires 103 adjacent to each other and grouped inside insulating sheaths 104.
According to an aspect of the invention, each conductor 103 is arranged at 90° with respect to the adjacent conductor 103.
Advantageously according to the invention, the ring 102 is embedded within the outer sheath 101.
Advantageously according to the invention, the section of each conductor 103 is a circular sector having the same area . Advantageously according to the invention, the sheaths 104 of each conductor 103 are perfectly adjacent to one another and to the outer sheath 101.
Advantageously according to the invention, the conductors 103 and the sheaths 104 are compacted so as to reduce the empty spaces visible in the multipolar cable of Figure 1.
According to an aspect of the invention, the conductors 103 and the ring 102 are made of aluminum.
According to a second embodiment of the invention, not shown in the figure, the sectorial aluminum multipolar cable comprises three conductors 103 provided with sheaths 104, arranged at 120° from each other.
According to a third embodiment of the invention, not shown in the figures, the sectorial aluminum multipolar cable comprises two conductors 103 provided with sheaths 104, arranged at 180° from each other.
As stated above, the present invention is also related to a process for manufacturing a sectorial aluminum multipolar cable.
In particular, the process for manufacturing a cable 100 comprising a step of forming at least one outer insulating sheath 101 and a step of forming at least two metal conductors 103 grouped inside insulating sheaths 104, also comprises a step of forming the first conductors 103 having equal circular sector sections and a step of forming said sheaths 104 adjacent to the outer sheath 101 and between them.
According to an aspect of the invention, the step of forming the conductor 103 having equal circular sector sections comprises using prespirraling head suitable to the formation of a group of conductors 103 arranged at 90° or 120° or 180° from the adjacent group, depending on whether the multipolar cable is quadripolar or tripolar or bipolar.
Advantageously according to the invention, the prespirraling heads are equipped with materials, such as thermoplastic polymers or elastomers, suitable to compact the material in production without stressing it.
According to an aspect of the invention, the step of forming the conductors 103 having equal circular sector sections comprises completely eliminating the empty points between the conductors 103.
According to another aspect of the invention, the step of forming the conductors 103 having equal circular sector sections comprises adhering the insulating material to the conductor in order do not create air bubbles inside that cause gaps on the insulator itself. According to another aspect of the invention, the process for manufacturing the cable 10 comprises wrapping the insulated core in order to avoid the decomposition in the final stage of forming the reel.
Therefore, the sectorial aluminum multipolar cable and the relative manufacturing process according to the invention allow to reduce the gaps between the internal conductors .
Another advantage of the sectorial aluminum multipolar cable and the relative manufacturing process according to the invention is the presence of the ring of conductors in the outer sheath which increases the surface area of the conductors thereby increasing the electrical conductivity.
Finally, the sectorial aluminum multipolar cable and the relative manufacturing process according to the invention are simply and effective.
Finally it is clear that the system and method for aligning intramedullary nails sectorial aluminum multipolar cable and the relative manufacturing process described and illustrated here can be modified and varied without departing from the protective scope of the present invention, as defined in the appended claims.

Claims

1. A sectorial aluminum multipolar cable (100) comprising :
- At least one outer insulating sheath (101) ;
- At least two first metal conductors (103) grouped inside insulating sheaths (104);
characterized in that said first conductors (103) have circular sector sections having equal area and in that said sheaths (104) are adjacent to said outer sheath (101) and between them.
2. A sectorial aluminum multipolar cable (100) according to claim 1, characterized in that said outer sheath (101) comprises inside it at least one ring (102) of second metal conductors.
3. A sectorial aluminum multipolar cable (100) according to claim 1, characterized in that said first metal conductors (103) are arranged at 90° or 120° or 180° between them.
4. A sectorial aluminum multipolar cable according to claim 1, characterized in that said first conductors
(103) are made of aluminum.
5. A sectorial aluminum multipolar cable according to claim 2, characterized in that said ring (102) is made of aluminum.
6. Process for manufacturing a sectorial aluminum multipolar cable comprising a step of forming at least one outer insulating sheath (101) and a step of forming at least two first metal conductors (103) grouped inside insulating sheaths (104), characterized in comprising a step of forming said first conductor (103) having circular sector sections having equal area and a step of forming said sheaths (104) adjacent to said outer sheath (101) and between them.
7. Process according to claim 6, characterized in that said step of forming the conductors (103) having circular sector sections having equal area comprises using "prespiralling heads" suitable for the formation of a group of conductors (103) arranged at 90° or 120° or 180° from an adjacent group of conductors (103), depending on whether the multipolar cable is three-pole or four-pole or bipolar.
8. Process according to claim 7, characterized in that the "prespiralling heads" are equipped with materials, chosen among thermoplastic polymers or elastomers, suitable for compacting the material in production without stressing it .
9. Process according to claim 6, characterized in that the step of forming the conductors (103) having circular sector sections having equal area comprises completely eliminating the points of vacuum between the conductors (103) .
10. Process according to claim 6, characterized in that the step of forming the conductors comprises adhering the insulator material to the conductor.
11. Process according to claim 6, characterized in comprising the step of wrapping the insulated core.
PCT/IB2015/060052 2015-12-30 2015-12-30 Sectorial aluminum multipolar cable and relative manufacturing process WO2017115111A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/IB2015/060052 WO2017115111A1 (en) 2015-12-30 2015-12-30 Sectorial aluminum multipolar cable and relative manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2015/060052 WO2017115111A1 (en) 2015-12-30 2015-12-30 Sectorial aluminum multipolar cable and relative manufacturing process

Publications (1)

Publication Number Publication Date
WO2017115111A1 true WO2017115111A1 (en) 2017-07-06

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PCT/IB2015/060052 WO2017115111A1 (en) 2015-12-30 2015-12-30 Sectorial aluminum multipolar cable and relative manufacturing process

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB571684A (en) * 1943-10-26 1945-09-04 Hugo Sonnenfeld Improved design of power cable and means for producing it
GB1216315A (en) * 1967-11-30 1970-12-16 Pirelli General Cable Works Improvements in or relating to the manufacture of electric cables comprising a plurality of sector-shaped conductors
GB1296147A (en) * 1969-02-17 1972-11-15
CA936638A (en) * 1969-09-11 1973-11-06 Verne Stefan Polymer compositions
US5732875A (en) * 1995-06-22 1998-03-31 Alcatel Kabel Ag & Co. Method for producing a sector conductor for electric power cables

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB571684A (en) * 1943-10-26 1945-09-04 Hugo Sonnenfeld Improved design of power cable and means for producing it
GB1216315A (en) * 1967-11-30 1970-12-16 Pirelli General Cable Works Improvements in or relating to the manufacture of electric cables comprising a plurality of sector-shaped conductors
GB1296147A (en) * 1969-02-17 1972-11-15
CA936638A (en) * 1969-09-11 1973-11-06 Verne Stefan Polymer compositions
US5732875A (en) * 1995-06-22 1998-03-31 Alcatel Kabel Ag & Co. Method for producing a sector conductor for electric power cables

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