WO2013102913A2

WO2013102913A2 - Electrical power conductor

Info

Publication number: WO2013102913A2
Application number: PCT/IN2012/000686
Authority: WO
Inventors: Rajendra MISHRA; Hitesh MUNDHADA
Original assignee: Sterlite Technologies Ltd
Current assignee: Sterlite Technologies Ltd
Priority date: 2011-10-19
Filing date: 2012-10-17
Publication date: 2013-07-11
Anticipated expiration: 2014-04-19
Also published as: WO2013102913A3; WO2013102913A4

Description

ELECTRICAL POWER CONDUCTOR

FIELD OF THE INVENTION

[0001] 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.

BACKGROUND OF THE INVENTION

[0002] Throughout the world transmission and distribution (T&D) of electric power is majorly done through bare overhead electric power conductors. For efficient use of energy and resources, reduction in (T&D) losses, reduction in losses caused due to aging, and improving robustness and usable life of electric power conductors still remain a challenge to be met on priority.

[0003] 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.

[0004] 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.

[0005] Apart from using high conductivity material, 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.

[0006] Though gradual improvements have been made over the time in electric power conductor technology, there still exists a need for further improvements which would provide greater ampacity, greater robustness, reduced power losses, and reduced aging and sagging effects in electric power conductors.

NEED OF THE INVENTION

[0007] Accordingly, there is a need to have electric power conductor having improved compaction of conductor material, improved current carrying capacity (ampacity), reduced losses, improved robustness, and lesser sagging and aging effects.

OBJECTS THE INVENTION

[0008] It is an object of the present invention is to provide a technically improved electrical power conductor.

[0009] Still another object of the present invention is to provide an electrical power conductor having improved compaction of conductor material.

[00010] Still another object of the present invention is to provide an electrical power conductor having enhanced current carrying capacity.

[00011] Still another object of the present invention is to provide an electrical power conductor having reduced electrical power losses.

[00012] Still another object of the present invention is to provide an electrical power conductor having enhanced robustness.

[00013] Still another object of the present invention is to provide an improved electrical power conductor for use in electrical power grids.

[00014] The other objects and advantages of the present invention will be apparent from the following description and selected embodiments of the invention provided therein in conjunction with the accompanying drawings which are incorporated for illustration of selected embodiments of the present invention and are not intended to limit the scope thereof.

SUMMARY OF THE INVENTION

[00015] To achieve the above objectives, the present invention provides an electrical power conductor having following technical advancements:

• Improved compaction of conductor material within the available conductor space

• Improved current carrying capacity (ampacity)

• Reduced electrical power losses

• Improved robustness

[00016] 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:

I. An Aluminum alloy comprising of:

a. 0.30-0.40 weight % of Si and

b. 0.30-0.40 weight % of Mg

II. An Aluminum alloy comprising of:

a. 0.15-0.25 weight % of Cu

b. 0.15-0.25 weight % of Fe

c. less than 0.07 weight % of Mg;

[00017] Note that the exact conductivity of the alloys mentioned above would depend on final composition of the alloy including other constituents also. However, conductivity of ~59% IACS {International Annealed Copper Standard) is achievable in Aluminum alloy comprising of 0.30-0.40 weight % of Si and 0.30-0.40 weight % of Mg.

[00018] 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. 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.

[00019] When arranged and laid intelligently within an electrical power conductor, the non-circular cross-sectional shape of strands is useful in providing more conductor material per unit volume of the electrical power conductor. Hence, though the structural dimensions of the electrical power conductor remain the same, due to better compaction and availability of more conductor material, current carrying capacity i.e. ampacity of the electrical power conductor is increased. In a particular embodiment of the present invention, 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.

[00020] According to one embodiment of the present invention, 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:

I. An Aluminum alloy comprising of: a. 0.30-0.40 weight % of Si and

b. 0.30-0.40 weight % of Mg

II. 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;

cross-sectional shape of each 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. 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).

[00021] In another embodiment of the electric power conductor of the present invention, 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 each of said multiple strands are made of a metal alloy selected from following two alloy types:

I. An Aluminum alloy comprising of:

a. 0.30-0.40 weight % of Si and

b. 0.30-0.40 weight % of Mg;

II. 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;

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).

[00022] 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.

BRIEF DESCRIPTION OF THE ACCOMPANYING FIGURES

[00023] The objects and features of the present invention will become clear when read in conjunction with the accompanying figures, in which:

[00024] Figure 1 shows a perspective view of an electrical power conductor in accordance with the first embodiment of the present invention.

[00025] Figure 2 shows a cross-sectional view of the electrical power conductor in accordance with the first embodiment of the present invention.

[00026] 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).

[00027] Figure 4 shows a cross-sectional view of conventional electrical power conductor of Figure 3.

[00028] Figure 5 shows a perspective view of an electrical power conductor in accordance with the second embodiment of the present invention.

[00029] Figure 6 shows a cross-sectional view of the electrical power conductor in accordance with the second embodiment of the present invention.

[00030] It should be understood that the drawings and the associated descriptions below are intended and provided to illustrate embodiments of the invention and not to limit the scope of the invention. Also, it should be noted that the drawings are not necessarily drawn to scale.

DETAILED DESCRIPTION

[00031] Reference will now be made in detail to selected embodiments of the present invention, examples of which are illustrated in the accompanying drawings, which are not intended to limit scope of the present invention. Whenever possible, the same reference numerals will be used throughout the description to refer to the same or like parts of the invention.

[00032] 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.

[00033] As shown in Figure 1, 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:

I. An Aluminum alloy comprising of:

a. 0.30-0.40 weight % of Si and

b. 0.30-0.40 weight % of g

II. 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;

and lies symmetrically around the longitudinal axis AA'. 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'. In this embodiment, 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. In detail, 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. 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. In detail, 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. In the outer layer 110, 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. In this embodiment, central core 102, strands 104, strands 108 and strands 112 are components of the electrical power conductor 100.

[00034] Further, 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.

[00035] In other words, 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. if two cross- sections are said to be in 'tangential contact', it is meant that they are in contact with each other (or touch each other) only at a single point. [00036] In the cross-section view of the first embodiment, it is clearly shown in Figure 2 that within both the inner layer 106 and the outer layer 110, the cross-sections of any two adjacent strands belonging to a same layer, completely touch each other through at least one of the sides of their individual cross-section peripheries. Hence, the cross-sections of any two adjacent strands belonging to a same layer are in contact with each other at more than one points. In this embodiment, it is ensured that a high level of material compaction is achieved within the electrical power conductor 100.

[00037] Experiments were conducted to collect the performance data of electric power conductor prepared according to the first embodiment of the invention. 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.

TABLE 1

[00038] To establish an enhancement in performance, the performance of electric power conductor provided by the first embodiment of the present invention (having specifications as provided in Table 1 and Table 2) 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. As shown in Figure 3, 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. In detail, 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. In the outer layer 210, 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. As mentioned above, 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. 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.

[00039] Table 3 below provides the count and dimensions of components of the conventional electric power conductor shown in Figure 3. For comparing the performances of the electric power conductor provided by the first embodiment of the invention with 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.

TABLE 3

[00040] Table. 4 below compares the performance of the electric power conductor as provided by the first embodiment of the invention with the conventional electric power conductor described above. TABLE 4

[00041] It can be fairly concluded from Table 4 that 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.

[00042] 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. It should be noted that, the set of count and dimensions of components of electrical power conductor of the first embodiment as described herein above (and its overall dimensions as described above) were chosen to prepare an exemplary working embodiment of the invention and these set of dimensions of electrical power conductor are not intended to limit the scope of the invention. Various other embodiments of the invention wherein the dimensions of the electrical power conductor are suitably chosen are fully covered by the scope of the invention.

[00043] Another embodiment of the invention which is fully covered by the scope of the invention is described below. It should be noted that the count and dimensions of components of the embodiments electrical power conductor provided below can also be suitably varied according to requirements.

[00044] 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.

[00045] As shown in Figure 5, 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:

I. An Aluminum alloy comprising of: (a) 0.30-0.40 weight % of Si and (b) 0.30- 0.40 weight % of Mg

II. 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.

[00047] Layer 304 is formed of multiple compactly packed trapezoidal cross-section strands 306 made of same metal alloy as that of central core 302. In detail, 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. In the layer 304, 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. In detail, 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. In layer 308, 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. Also, 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. In this embodiment, central core 302 strands 306, strands 310 are components of the electrical power conductor 300.

[00048] Further, 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.

[00049] In other words, 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.

[00050] In the cross-section view of the second embodiment, it is clearly shown in Figure 6 that within both the inner layer 304 and the outer layer 308, the cross-sections of any two adjacent strands belonging to a same layer completely touch each other through at least one of the sides of their individual peripheries. Hence, the cross-sections of any two adjacent strands belonging to a same layer are in contact with each other at more than one points. In this embodiment, it is ensured that a high level of material compaction is achieved within the electrical power conductor 300.

[00051] It is to be noted that since at least two of the electric power conductor provided by the present invention have non-circular cross-section, said strands include at least two sides.

[00052] It is to be noted that, instead of using strands having a cross-sectional shape including perfectly straight sides, strands having curved sides in their cross-sectional shape may also be used. It should also be noted that embodiments of the present invention which use strands having various other non-circular shapes such as such as triangular, quadrangular, trapezoidal, pentagonal, hexagonal, heptagonal, octagonal etc. are also fully covered within the scope of the invention. Also, it is to be noted that some embodiments of the present invention may use multiple strands having different non- circular cross- sectional shapes. Next, though the embodiments shown above in Figures 1 and 5 include a central core, it should be noted that various embodiments of the invention wherein the power conductor does not include a central core are also fully covered within the scope of the invention.

[00053] It should be noted that although the invention has been described in considerable detail in language specific to structural features, it is to be understood that the phraseology and terminology employed herein, as well as the abstract, are for the purpose of description and should not be regarded as limiting. And, although the invention has been described with selected embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments. Indeed, various other embodiments of the claimed invention that are obvious to those skilled in the art are fully covered within the scope of the invention.

Claims

An electrical power conductor having a longitudinal axis, said electrical power conductor comprising:

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 (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;

cross-sectional shape of each 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.

an Aluminum alloy comprising of: (a) 0.30-0.40 weight % of Si and (b) 0.30-0.40 weight % of Mg

cross-sectional shape of each 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 does not lie in tangential contact with cross-section of at least one of the strands lying adjacent to it.

3. An electrical power conductor having a longitudinal axis, said electrical power conductor comprising:

at least two of said multiple strands are made of an Aluminum alloy;

cross-sectional shape of each 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.

4. An electrical power conductor having a longitudinal axis, said electrical power conductor comprising:

at least two of said multiple strands are made of an Aluminum alloy;

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.

5. An electrical power conductor having a longitudinal axis, said electrical power conductor comprising:

each of said multiple strands are made of an Aluminum alloy; 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.

each of said multiple strands are made of an Aluminum alloy;

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 does not lie in tangential contact with cross-section of at least one of the strands lying adjacent to it.

An electrical power conductor as claimed in claim 1 or claim 2 or claim 3 or claim 4 or claim 5 or claim 6 wherein said electrical power conductor further comprises of a central core, said central core lying symmetrically around the longitudinal axis.

An electrical power conductor as claimed in claim 1 or claim 2 or claim 3 or claim 4, wherein the cross-sectional shape of said at least two of said multiple strands includes at least two^'sides.

An electrical power conductor as claimed in claim 5 or claim 6, wherein the cross-sectional shape of each of said multiple strands is trapezoidal.