WO2013102913A2 - Conducteur de puissance électrique - Google Patents

Conducteur de puissance électrique Download PDF

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Publication number
WO2013102913A2
WO2013102913A2 PCT/IN2012/000686 IN2012000686W WO2013102913A2 WO 2013102913 A2 WO2013102913 A2 WO 2013102913A2 IN 2012000686 W IN2012000686 W IN 2012000686W WO 2013102913 A2 WO2013102913 A2 WO 2013102913A2
Authority
WO
WIPO (PCT)
Prior art keywords
cross
strands
power conductor
electrical power
multiple strands
Prior art date
Application number
PCT/IN2012/000686
Other languages
English (en)
Other versions
WO2013102913A4 (fr
WO2013102913A3 (fr
Inventor
Rajendra MISHRA
Hitesh MUNDHADA
Original Assignee
Sterlite Technologies Ltd.
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 Sterlite Technologies Ltd. filed Critical Sterlite Technologies Ltd.
Publication of WO2013102913A2 publication Critical patent/WO2013102913A2/fr
Publication of WO2013102913A3 publication Critical patent/WO2013102913A3/fr
Publication of WO2013102913A4 publication Critical patent/WO2013102913A4/fr

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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
    • H01B1/026—Alloys based on copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • 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

Definitions

  • the present invention relates to the field of electrical power conductors. More specifically, the present invention relates to the field of electrical power conductors having improved compaction of conductor material, improved current carrying capacity (ampacity), improved robustness, reduced losses and lesser sagging and aging effects.
  • T&D transmission and distribution
  • Resistive losses incurred during T&D of electricity through electric power conductors is a major factor contributing to T&D losses.
  • a popular solution to reduce resistive losses incurred in electric power conductors is the use of high conductivity material (or a material having low electrical resistance). While selecting an electrical conductor material, apart from its conductivity, there are several other factors too which need careful analysis. These include economic viability, physical and chemical properties of the material, safe operating temperature range for continuous power transmission at specific range of load, modulus of elasticity, strength, coefficient of linear expansion, ultimate tensile strength (UTS), resistance to corrosion, etc.
  • bare electrical power conductors While selecting an electrical conductor material for bare overhead power conductor, analysis of above mentioned properties are of particular importance. It is required that bare electrical power conductors should have high conductivity, lesser electrical resistance, greater current carrying capacity (ampacity), should have higher strength, should be robust, should have low sag, should have good resistance to corrosion and should have longer life of satisfactory performance.
  • resistive losses of power conductors can also be reduced by improving their structure, components and design. And, apart from contributing to the reduction in resistive losses, the structure, components and design of overhead power conductor also play an important role in its overall performance such as ampacity, safe operating temperature for continuous power transmission at a specific range of load, robustness etc.
  • It is an object of the present invention is to provide a technically improved electrical power conductor.
  • Still another object of the present invention is to provide an electrical power conductor having improved compaction of conductor material.
  • Still another object of the present invention is to provide an electrical power conductor having enhanced current carrying capacity.
  • Still another object of the present invention is to provide an electrical power conductor having reduced electrical power losses.
  • Still another object of the present invention is to provide an electrical power conductor having enhanced robustness.
  • Still another object of the present invention is to provide an improved electrical power conductor for use in electrical power grids.
  • the present invention provides an electrical power conductor having following technical advancements:
  • the electric power conductor of the present invention comprises of a longitudinal axis and further comprises of multiple compactly packed strands for conducting electricity, wherein the cross-sectional shape of each of at least two of said multiple strands is non-circular, and said at least two of said multiple strands are made of a metal alloy selected from following two alloy types:
  • An Aluminum alloy comprising of:
  • An Aluminum alloy comprising of:
  • Each of said at least two of said multiple strands are compactly laid around the longitudinal axis.
  • the shape of non-circular cross-section of each of said at least two of said multiple strands is chosen such that it assists in better compaction of strands around the longitudinal axis.
  • the cross-sectional shape of said at least two of said multiple strands is non-circular; and said at least two of said multiple strands are laid around the longitudinal axis in a manner such that within a cross-section of the electrical power conductor, cross-section of each of said at least two of said multiple strands lies in contact with cross-section of at least one of the strands lying adjacent to it at more than one points (i.e.
  • each of said at least two of said multiple strands are laid around the longitudinal axis in a manner such that within a cross-section of the electrical power conductor, cross-section of each of said at least two of said multiple strands does not lie in tangential contact with cross-section of at least one of the strands lying adjacent to it). It is ensured that a high level of material compaction is achieved within the electrical power conductor.
  • the non- circular cross-sectional shape of each of said at least two of said multiple strands could include shapes such as triangular, trapezoidal, Quadrilateral (such as square, rectangular, parallelogram, etc.), pentagonal, hexagonal, heptagonal, octagonal etc.
  • each of the non-circular cross-section strands are arranged within the conductor in a manner such that there is substantially little or no voids left in between said strand and strands which lie adjacent to it. Also, better compaction of strands also helps in enhancing the robustness and reduction of sagging of the power conductor when hung between pylons.
  • the electrical power conductor comprises of a longitudinal axis, said electrical power conductor further comprises of:
  • multiple strands for conducting electricity said multiple strands being laid around the longitudinal axis, wherein at least two of said multiple strands are made of a metal alloy selected from following two alloy types:
  • An Aluminum alloy comprising of: a. 0.30-0.40 weight % of Si and
  • An Aluminum alloy comprising of:
  • cross-sectional shape of each of said at least two of said multiple strands is non-circular
  • said at least two of said multiple strands are laid around the longitudinal axis in a manner such that within a cross-section of the electrical power conductor, cross-section of each of said at least two of said multiple strands lies in contact with cross-section of at least one of the strands lying adjacent to it at more than one points (i.e. said at least two of said multiple strands are laid around the longitudinal axis in a manner such that within a cross- section of the electrical power conductor, cross-section of each of said at least two of said multiple strands does not lie in tangential contact with cross-section of at least one of the strands lying adjacent to it).
  • the electrical power conductor comprises of a longitudinal axis, said electrical power conductor further comprises of:
  • each of said multiple strands are made of a metal alloy selected from following two alloy types:
  • An Aluminum alloy comprising of:
  • An Aluminum alloy comprising of:
  • cross-sectional shape of each of said multiple strands is non-circular; and each of said multiple strands are laid around the longitudinal axis in a manner such that within a cross-section of the electrical power conductor, cross-section of each of said multiple strands lies in contact with cross-section of at least one of the strands lying adjacent to it at more than one points (i.e. each of said multiple strands are laid around the longitudinal axis in a manner such that within a cross-section of the electrical power conductor, cross-section of each of said multiple strands does not lie in tangential contact with cross-section of at least one of the strands lying adjacent to it).
  • the features of the present invention provide better compaction of conductor material within the electrical power conductor and hence result in enhanced overall ampacity of the electrical power conductor.
  • Figure 1 shows a perspective view of an electrical power conductor in accordance with the first embodiment of the present invention.
  • Figure 2 shows a cross-sectional view of the electrical power conductor in accordance with the first embodiment of the present invention.
  • Figure 3 shows a perspective view of a conventional electrical power conductor (comprising only of circular cross-section strands and which is materially and diametrically similar to the electrical power conductor as provided by the first embodiment of the present invention).
  • Figure 4 shows a cross-sectional view of conventional electrical power conductor of Figure 3.
  • Figure 5 shows a perspective view of an electrical power conductor in accordance with the second embodiment of the present invention.
  • Figure 6 shows a cross-sectional view of the electrical power conductor in accordance with the second embodiment of the present invention.
  • Figure 1 shows a perspective view of the first embodiment of the electrical power conductor in accordance with the present invention.
  • Figure 2 shows a cross- sectional view of the electrical power conductor in accordance with the first embodiment of the present invention.
  • the electrical power conductor 100 comprises of a longitudinal axis AA' and a central core 102.
  • the central core 102 has a circular cross- section.
  • the central core 102 is made of a metal alloy selected from following two alloy types:
  • An Aluminum alloy comprising of:
  • An Aluminum alloy comprising of:
  • Electrical power conductor 100 further comprises of multiple circular cross-section strands 104 which are helically wound around the central core 102 and the longitudinal axis AA'.
  • circular cross-section strands 104 are also made of same metal alloy as that of central core 102.
  • Strands 104 are surrounded by an inner layer 106.
  • Layer 106 is formed of multiple compactly packed trapezoidal cross-section strands 108.
  • Strands 108 are also made of same metal alloy as that of central core 102.
  • layer 106 is formed by helically winding multiple trapezoidal cross-section strands 108 around strands 104 and the axis AA' as shown in Figure 1.
  • Inner layer 106 Within the inner layer 106, strands 108 are laid in a manner such that there is substantially little or no voids left in between the adjacent strands.
  • Inner layer 106 is further surrounded by an outer layer 110.
  • Outer layer 110 is formed of multiple compactly packed trapezoidal cross-section strands 112.
  • Strands 112 are also made of same metal alloy as that of central core 102.
  • layer 110 is formed by, helically winding multiple trapezoidal cross-section strands 112 around the inner layer 106 and the axis AA' in a manner as shown in Figure 1.
  • strands 112 are laid around the inner layer 106 and the longitudinal axis AA' in a manner such that there is substantially little or no voids left in between the adjacent strands. Also, strands 112 are laid around the inner layer 106 in a manner such that the outer layer 110 compactly fits over the inner layer 106 and there is substantially little or no voids left between the two layers.
  • central core 102, strands 104, strands 108 and strands 112 are components of the electrical power conductor 100.
  • compact packing of strands 108 and 112 to form the inner layer 106 and outer layer 110 respectively is done in a in a manner such that: cross-section of each of the strands in the inner layer 106 touches (or is in contact with) the cross-section of any strand adjacent to it in the same layer at more than one points; and cross-section of each of the strands in the outer layer 110 touches (or is in contact with) the cross-section of any other strand lying adjacent to it in the same layer at more than one points.
  • compact packing of strands 108 and 112 to form the inner layer 106 and outer layer 110 is done in a in a manner such that: cross-section of each of the strands in the inner layer 106 does not lie in tangential contact (or single point contact) with the cross-section of any other strand adjacent to it in the same layer; and cross- section of each of the strands in the outer layer 110 does not lie in tangential contact (or single point contact) with the cross-section of any other strand lying adjacent to it in the same layer.
  • the expression 'tangential contact' signifies a single point contact between two peripheries or shapes or figures (or cross-sections in this case), i.e.
  • Table 1 provides the count and dimensions of components of an electric power conductor shown in Figure 1 and 2.
  • Basic performance data of electric power conductor prepared according to the first embodiment of the invention and having count and dimensions of components as provided in Table 1 is provided in Table 2.
  • the performance of electric power conductor provided by the first embodiment of the present invention was compared with a conventional electric power conductor (comprising only of circular cross-section strands) shown in Figure 3.
  • the conventional electric power conductor of Figure 3 comprises of all circular cross-section strands and each strand of the electrical power conductor is made of same aluminum alloy as the central core 102 of the first embodiment described above.
  • the conventional electric power conductor 200 comprises of a longitudinal axis BB' and a central core 202.
  • the central core 202 has a circular cross- section.
  • the central core 202 is made of same aluminum alloy as the central core 102 of the first embodiment described above and lies symmetrically around the longitudinal axis BB'.
  • Electrical power conductor 200 further comprises of multiple circular cross-section strands 204 which are helically wound around the central core 202 and the longitudinal axis BB'.
  • the circular cross-section strands 204 are also made of same aluminum alloy as the central core 102 of the first embodiment described above.
  • Strands 204 are surrounded by an inner layer 206.
  • Layer 206 is formed of multiple compactly packed circular cross- section strands 208.
  • Strands 208 are also made of same aluminum alloy as the central core 102 of the first embodiment described above.
  • layer 206 is formed by helically winding multiple circular cross-section strands 208 around strands 204 and the axis BB' as shown in figure 3. Within the inner layer 206, strands 208 are laid in a manner to achieve better compaction. Inner layer 206 is further surrounded by an outer layer 210. Outer layer 210 is formed of multiple compactly packed circular cross-section strands 212. Strands 212 are also made of same aluminum alloy as the central core 102 of the first embodiment described above. In detail, layer 210 is formed by, helically winding multiple circular cross-section strands 212 around the inner layer 206 and the axis BB' as shown in Figure 3.
  • strands 212 are laid around inner layer 206 and the longitudinal axis BB' in a manner to achieve better compaction. Also, strands 212 are laid around the inner layer 206 in a manner such that the outer layer 210 compactly fits over the inner layer 206.
  • the central core 202, strands 204, strands 208 and strands 212 are components of the electrical power conductor 200 and are made of same aluminum alloy as the central core 102 of the first embodiment described above. It is to be noted that in spite of compact packing of strands 204, 208 and 212, a lot of voids remain between them due to their circular cross-section.
  • FIG. 4 A cross-sectional view of the conventional electric power conductor of Figure 3 is shown in Figure 4. Voids among the strands 204, 208, 212 of conventional electric power conductor are clearly visible in Figure 4. Due to these voids, the available space within the electric power conductor for conductor material is not fully utilized and less power conductor material is packed within the available space. Availability of lesser power conductor material in turn reduces the current carrying capacity and also affects overall performance of the electrical power conductor. The electrical power conductor of present invention provides an improved solution to this problem.
  • Table 3 below provides the count and dimensions of components of the conventional electric power conductor shown in Figure 3.
  • the diametric dimensions of the strands 202, 204, layer 210 and layer 206 of the conventional electric power conductor were kept same as diametric dimensions of strands 102, 104, layer 110 and layer 106 respectively of the electric power conductor provided by the first embodiment of the invention.
  • the electrical power conductor provided by the first embodiment of the present invention has lesser resistance, better UTS, better robustness and better Ampacity in comparison to a conventional all circular cross-section strands electric power conductor of similar dimensions and material composition. Hence the electric power conductor of the present also has reduced electrical power losses during transmission of electricity.
  • Electrical power conductor provided by the first embodiment of the present invention also achieves better conductor material compaction. It was found that the Electrical power conductor provided by the first embodiment of the present invention achieves about 20% more material compaction when compared to the conventional all circular cross-sectio strands electric power conductor as described above. It was also found that electrical power conductor provided by the first embodiment of the present invention could achieve better compaction by filling up to 97.33 % of available space with conductor material. In other words, electrical power conductor provided by the first ernbodiment of the present invention could achieve better compaction by reducing voids within the electrical power conductor to just 2.67% of available conductor material space.
  • Second embodiment of the present invention is shown in Figures 5 and 6. While Figure 5 shows the perspective view of the second embodiment of the electrical power conductor in accordance with the present invention, Figure 6 shows a cross-sectional view of the second embodiment of the electrical power conductor in accordance with the present invention.
  • electrical power conductor 300 comprises of a longitudinal axis CC and a cylindrical central core 302 having a circular cross-section.
  • the central core 302 is made of a metal alloy selected from following two alloy types:
  • An Aluminum alloy comprising of: (a) 0.30-0.40 weight % of Si and (b) 0.30- 0.40 weight % of Mg
  • An Aluminum alloy comprising of: (a) 0.15-0.25 weight % of Cu, (b) 0.15-0.25 weight % of Fe and (c ) less than 0.07 weight % of Mg; [00046]
  • the cylindrical central core 302 lies symmetrically around the longitudinal axis CC and is surrounded by an inner layer 304.
  • Layer 304 is formed of multiple compactly packed trapezoidal cross-section strands 306 made of same metal alloy as that of central core 302.
  • layer 304 is formed by helically winding multiple trapezoidal cross-section strands 306 around the central core 302 and the axis CC as shown in Figure 5.
  • strands 306 are laid around the central core 302 in a manner such that there are substantially little or no voids left in between the adjacent strands.
  • Inner layer 304 is further surrounded by an outer layer 308.
  • Outer layer 308 is formed of multiple compactly packed trapezoidal cross-section strands 310 made of same metal alloy as that of central core 302.
  • layer 308 is formed by, helically winding multiple trapezoidal cross-section strands 310 around inner layer 304 and the axis CC as shown in Figure 5.
  • strands 310 are laid around inner layer 304 and longitudinal axis CC of the power conductor in a manner such that there is substantially little or no voids left in between the adjacent strands.
  • strands 310 are laid around the inner layer 304 in a manner such that the outer layer 308 compactly fits over the inner layer 304 and there is substantially little or no voids left among the two layers.
  • central core 302 strands 306, strands 310 are components of the electrical power conductor 300.
  • compact packing of strands 306 and 310 to form the inner layer 304 and outer layer 308 is done in a in a manner such that: cross-section of each of the strands in the inner layer 304 touches (or is in contact with) the cross-section of any other strand lying adjacent to it in the same layer at more than one points and; cross-section of each of the strands 310 in the outer layer 308 touches (or is in contact with) the cross-section of any other strand lying adjacent to it in the same layer at more than one points.
  • compact packing of strands 306 and 310 to form the inner layer 304 and outer layer 308 is done in a in a manner such that: cross-section of each of the strands in the inner layer 304 does not lie in tangential contact with the cross-section of any other strand lying adjacent to it; and cross-section of each of the strands in the outer layer 308 does not lie in tangential contact with the cross-section of any other strand lying adjacent to it in the same layer.
  • the expression 'Tangential contact' signifies a single point contact between two peripheries or shapes or figures (or cross-sections in this case), i.e. if two cross-sections are said to be in 'tangential contact', it is meant that they touch each other only at a single point.
  • said strands include at least two sides.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Conductive Materials (AREA)

Abstract

La présente invention concerne un conducteur de puissance électrique qui présente une intensité admissible et une robustesse améliorées, des pertes réduites ainsi qu'un moindre affaissement et des effets de vieillissement réduits. Le conducteur de puissance électrique comprend plusieurs brins servant à conduire l'électricité, au moins deux de ces multiples brins étant constitués d'un alliage sélectionné parmi: I. Un alliage d'aluminium comprenant (en pourcentage en poids): a. Si: (0,30-0,40) et b. Mg: (0,30-0,40) II. Un alliage d'aluminium comprenant (en pourcentage en poids): a. Cu: (0,15-0,25), b. Fe: (0,15-0,25), et c. Mg: (<0.07). La forme de la section transversale de chacun desdits multiples brins est non circulaire et au moins deux desdits multiples brins sont disposés autour d'un axe longitudinal du conducteur de puissance de sorte que dans une section transversale du conducteur de puissance, la section transversale de chacun desdits au moins deux brins des multiples brins ne se situe pas en contact tangentiel avec la section transversale d'au moins un des brins situés de manière adjacente à ce dernier.
PCT/IN2012/000686 2011-10-19 2012-10-17 Conducteur de puissance électrique WO2013102913A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN2926MU2011 2011-10-19
IN2926/MUM/2011 2011-10-19

Publications (3)

Publication Number Publication Date
WO2013102913A2 true WO2013102913A2 (fr) 2013-07-11
WO2013102913A3 WO2013102913A3 (fr) 2013-10-10
WO2013102913A4 WO2013102913A4 (fr) 2014-01-09

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PCT/IN2012/000686 WO2013102913A2 (fr) 2011-10-19 2012-10-17 Conducteur de puissance électrique

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5629645A (en) * 1979-08-13 1981-03-25 Furukawa Electric Co Ltd:The High-strength aluminum alloy of high conductivity
JPS61207542A (ja) * 1985-03-12 1986-09-13 Yazaki Corp 高力耐熱アルミニウム合金
US20070193767A1 (en) * 2006-02-01 2007-08-23 Daniel Guery Electricity transport conductor for overhead lines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5629645A (en) * 1979-08-13 1981-03-25 Furukawa Electric Co Ltd:The High-strength aluminum alloy of high conductivity
JPS61207542A (ja) * 1985-03-12 1986-09-13 Yazaki Corp 高力耐熱アルミニウム合金
US20070193767A1 (en) * 2006-02-01 2007-08-23 Daniel Guery Electricity transport conductor for overhead lines

Also Published As

Publication number Publication date
WO2013102913A4 (fr) 2014-01-09
WO2013102913A3 (fr) 2013-10-10

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