DESC:CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of IndianProvisional Application No. 3066/MUM/2013, filed on Sep. 24, 2013. The entire disclosure of the above application is incorporated herein by reference.

FIELD OF INVENTION

[0002] The invention generally relates to power transmission systems and more particularly to transmission cables employed in the power transmission systems.

BACKGROUND OF THE INVENTION

[0003] Electricity has become the basic need for all human beings. With increase in population, the demand for electricity supply has also gone up. To meet this increasing demand, existing power transmission system need to be upgraded to enable increased power transmission so as to sustain additional supply of voltage.

[0004] The option of employing underground cabling is notalways feasible in urban areas as the presence of structures along the paths prevent excavation of trenches and laying of underground cables. Also laying of cables for transmitting additional power in a thickly populated and congested city area is virtually impossible and also hazardous.

[0005] The existing corridors for transmitting power through bare overhead conductors cannot be widened to allow increased transmission voltages, since existing structures, restrictions on land procurement and safety aspects would not permit the formation of increased corridors required for drawing overhead conductors with increased power capacity.

[0006] Analternative option for transmitting power at higher voltages is to substantially increase the height of the existing transmission towers and the cross arms. The difficulties in implementing this include site constraints and financial considerations.

[0007] Further, as theelectricity flowing in the overhead conductorincreases, the temperature of the conductoris increased and subsequently the conductor expands resulting in increased sagof the conductor hung between the transmission towers. Theincrease in sag thus occurring makes it difficult for the overhead conductor to achieve the required safe ground clearance.

[0008] In addition, an increased transmission voltage leads to an increased electrical stress between the conductor and the air, and this results in increased corona losses that affect the efficiency of the transmission system.

[0009] Therefore, there exists a long felt need for a power transmission system that is capable of transmitting power at higher electrical voltages with increased efficiency whileachieving the required safe ground clearance.

BRIEF DESCRIPTION OF THE INVENTION

[0010] In one embodiment a power transmission assembly hung between two transmission towers is provided. The power transmission assembly comprises aconductor assembly comprising a conductor for transmitting current at a selected voltage, the conductor comprising at least one strand of conductive material, a semi conductive layer surrounding the conductor, the semi conductive layer configured for controlling the electrical stress in the conductor and an insulating layer surrounding the semi conductive layer, the insulating layer configured for providing the required level of insulation,anda support structure comprising multiple structural elements surrounding the insulating layer of the conductor assembly so as to strengthen the conductor assembly in order to reduce sagging of the conductor assembly.

[0011] In another embodiment, the power transmission assembly comprises a conductor assembly comprising a conductor for transmitting current at a selected voltage, the conductor comprising at least one strand of conductive material, a semi conductive layer surrounding the conductor, the semi conductive layer configured for controlling the electrical stress in the conductor and an insulating layer surrounding the semi conductive layer, the insulating layer configured for providing the required level of insulation, and a support structure coupled to the conductor assembly so as to strengthen the conductor assembly in order to reduce sagging of the conductor assembly.

[0012] In yet another embodiment, the power transmission assemblycomprisesa conductor assembly comprising a conductor for transmitting current at a selected voltage, the conductor comprising at least one strand of conductive material, a semi conductive layer surrounding the conductor, the semi conductive layer configured for controlling the electrical stress in the conductor and a first insulating layer surrounding the semi conductive layer, the first insulating layer configured for providing the required level of insulation, anda support structure positioned adjacent to the conductor assembly and coupled to the conductor assembly using at least one two part clamping device so as to strengthen the conductor assembly in order to reduce sagging of the conductor assembly.

[0013] In yet another embodiment, the power transmission assembly comprises a support structure, a conductor surrounding the support structure, the conductor configured for transmitting current at a selected voltage, the conductor comprising at least one strand of conductive material, a semi conductive layer surrounding the conductor, the semi conductive layer configured for controlling the electrical stress in the conductor, and an insulating layer surrounding the semi conductive layer, the insulating layer configured for providing the required level of insulation and wherein the support structure provides structural support for the conductor in order to reduce sagging of the power transmission assembly between the two transmission towers.

[0014] In yet another embodiment, the power transmission assembly comprises a conductor assembly comprising a first support structure, a conductor surrounding the first support structure, the conductor configured for transmitting current at a selected voltage, the conductor comprising at least one strand of conductive material, a semi conductive layer surrounding the conductor, the semi conductive layer configured for controlling the electrical stress in the conductor, and an insulating layer surrounding the semi conductive layer, the insulating layer configured for providing the required level of insulation. The power transmission assembly further comprises a second support structure, comprising multiple structural elements, surrounding the insulating layer of the conductor assembly such that the first support structure together with the second support structure provides structural support for the conductor assembly in order to reduce sagging of the conductor assembly between the two transmission towers.

[0015] Various other features and advantages of the invention will be made apparent from the following detailed description and the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Embodiments are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which:

[0017] FIG. 1 depicts a cross sectional view of a power transmission assembly as described in one embodiment of the invention;

[0018] FIG. 2 depicts a cross sectional view of the power transmission assembly as described in another embodiment;

[0019] FIG. 3 depicts a cross sectional view of the power transmission assembly as described in yet another embodiment;

[0020] FIG. 4 depicts a cross sectional view of the power transmission assembly as described in yet another embodiment; and

[0021] FIG. 5 depicts a cross sectional view of the power transmission assembly as described in yet another embodiment.

DETAILED DESCRIPTION OF THE INVENTION

[0022] It shall be observed that system components described in accordance with exemplary embodiments have been represented by known symbols in the figures, showing only specific details that are relevant for an understanding of the present disclosure. Further, details that are readily apparent to those skilled in the art may not have been disclosed.

[0023] Exemplary embodiments of the present disclosure provide a power transmission assembly that is supported by multiple transmission towers. The power transmission assembly comprises a conductor assembly and a support structure, positioned adjacent to the conductor assembly so as to strengthen the conductor assembly in order to reduce sagging of the power transmission assembly.

[0024] Accordingly, in one embodiment, as shown in FIG. 1, apower transmission assembly 100 is provided that includes a conductor assembly 101 comprising a conductor 102 for transmitting current at a selected voltage, a semi conductive layer 104 surrounding the conductor 102, the semi conductive layer 104 configured for controlling the electrical stress in the conductor 102 and an insulating layer 106 surrounding the semi conductive layer 104, the insulating layer 106 configured for insulating the conductor 102 at the required level.

[0025] Further, the conductor 102 in the conductor assembly 101 is sized according to the amount of electricity that the conductor 102 is configured to carry. Alternatively, the capacity of the conductor assembly 101 can be increased by using multiple strands of conductive material helically twisted together.

[0026] Specific types of conductor 102 may be constructed of aluminum and/or copper or alloys thereof. Exemplary conductor 102 employed in the power transmission assembly 100 includes aluminum conductor steel reinforced (ACSR), thermal-resistant aluminum alloy conductor steel reinforced (TACSR), ultra thermal-resistant aluminum alloy conductor steel reinforced (ZTACSR), ultra thermal-resistant aluminum alloy conductor Invar reinforced (ZTACIR), heat resistant aluminum alloys (ZTAL), ultra thermal-resistant aluminum alloy conductor steel reinforced (ZTACSR), extra thermal-resistant aluminum alloy conductor steel reinforced (XTACSR), extra thermal-resistant aluminum alloy conductor Invar reinforced (XTACIR), gap type ultra thermal resistant aluminum alloy steel reinforced (GZTACSR), high strength thermal resistant aluminum alloy conductor steel reinforced (KTACSR), all aluminum conductor (AAC), all aluminum alloy conductor (AAAC), aluminum conductor composite core (ACCC), and aluminum conductor steel supported (ACSS).

[0027] In one preferred embodiment, the conductor 102 is aAll Aluminum Alloy Conductor (AAAC) having approximately 570 square millimeter of thickness. Skilled artisans shall however appreciate that the parts shown in the figures are not proportional to the actual size of the components that are represented by the parts.

[0028] The semi-conductive layer 104 is disposed between the conductor 102 and the insulating layer 106 so as to prevent any activity of partial discharge in the interstices of the strands of conductive material. The semi-conductive layer 104 is typically a semi-conducting cross linked polymer layer applied by extrusion around the conductor 102.

[0029] Arranged in a position radially external to the semi-conductive layer 104, the insulating layer 106 is generally made of a thermoplastic or thermoset material. Examples include cross-linked polyethylene (XLPE), ethylene-propylene rubber (EPR), or polyvinyl chloride (PVC). The insulating layer 106 may include additives to enhance the life of insulation. The insulating layer 106 is configured to isolate the conductor 102 from any external and/or accidental interference while providing the required level of insulation. The size of the insulating layer 106 is dictated by the insulating material employed and also the operating voltage of the power transmission assembly 100.

[0030] In a preferred embodiment, the insulating layer 106 is of approximately 11 millimeter thickness of XLPE insulation that provides a low enough leakage (not exceeding 5 milli Amperes) current in case of an accidental contact.

[0031] Still referring to FIG. 1, the power transmission assembly 100 further comprises a support structure 108 comprising multiple structural elements surrounding the insulating layer 106 of the conductor assembly 101 so as to strengthen the conductor assembly 101 in order to reduce sagging of the conductor assembly 101.

[0032] Further, the structural elements of the support structure 108 are helically laid over the insulating layer 106 of the conductor assembly 101.This sort of arrangement provides enhanced strengthening for the conductor assembly 101.In an exemplary embodiment, the structural elements of the support structure 108 comprise aramid fibers that are synthetic fibers constructed of para bonded aromatic polyamide (aramid) fiber. Further, the thickness of each of the structural elements of the support structure 108 is approximately 3 millimeter in this embodiment.

[0033] In one preferred embodiment, the support structure 108 is tensioned to approximately 19,400 pounds (8800 Kilograms) which is about twenty percent of the breaking strength of the support structure 108. The mechanical support provided by the support structure 108 assists in controlling the sag which would otherwise be excessive on account of the same tower to tower spacing have to be maintained. In addition to providing reinforcement to the conductor assembly 101, the support structure 108 may provide the conductor assembly 101 with additional insulation.

[0034] The power transmission assembly 100 of FIG. 1,may further comprise an outer insulating layer 112 surrounding the support structure 108 so as to provide external protection to the support structure 108. The outer insulating layer 112 provides non tracking, erosion and weather resistant protection for the inner layers within the power transmission assembly 100.

[0035] Similar in construction to the insulating layer 106, the outer insulating layer 112 is generally made of a thermoplastic or thermoset material. Examples include cross-linked polyethylene (XLPE), ethylene-propylene rubber (EPR), or polyvinyl chloride (PVC). The outer insulating layer 112 may further include additives to enhance the life of the insulation.

[0036] Turning now to FIG. 2, as described in another embodiment, a power transmission assembly 200 hung between two transmission towers (not shown) is provided. The power transmission assembly 200 comprises a conductor assembly 201 comprising a conductor 202 for transmitting current at a selected voltage, a semi conductive layer 204 surrounding the conductor 202 and an insulating layer 206 surrounding the semi conductive layer 204. The power transmission assembly 200 may further comprise a support structure 208 coupled to the conductor assembly 201 so as to strengthen the conductor assembly 201 in order to reduce sagging of the conductor assembly 201.

[0037] Skilled artisans shall however appreciate that the conductor 202, the semi conductive layer 204 and the insulating layer 206 are similar in construction respectively to the elements 102, 104, 106 described with respect to FIG. 1 and hence shall not be described in detail.

[0038] Referring back to FIG. 2, the conductor assembly 201 and the support structure 208 are helically twisted together to form a strapped assembly (not shown). In an exemplary embodiment, the support structure 208 comprises aramid fibers that are synthetic fibers constructed of para-bonded aromatic polyamide (aramid) fiber. Further, the thickness of the support structure 208 is approximately 25 millimeter in this embodiment.

[0039] In this embodiment, the support structure 208 is preferably tensioned to approximately 8,800 Kilo grams at the dead ends and the conductor assembly 201 may or may not be tensioned based on the requirement. However, the conductor assembly 201 is made self supporting with the help of the support structure 208.

[0040] The support structure 208 positioned adjacent to the insulating layer 206 of the conductor assembly 201 as shown in FIG. 2, can sustain temperature up to about 300 degree Celsius, that is lower than that of the conductor assembly 201 by about 10 degree Celsius. The tension in the support structure 208 being in the order of about 8,800 Kilo grams remains least affected by temperature changes or creep. The sag in the conductor assembly 201 is thus controlled.

[0041] The power transmission assembly 200 further comprises an outer insulating layer 210 employed for insulating the strapped assembly. Skilled artisans shall however appreciate that the outer insulating layer 210 is similar in construction to the element 112 described with respect to FIG. 1 and hence shall not be described in detail.

[0042] The power transmission assembly 200 further comprises a filler element 212 disposed between the outer insulating layer 210, the support structure 208 and the conductor assembly 201, so as to contribute to the structural formation of the power transmission assembly 200. In one exemplary embodiment, the filler material comprises polyethylene.

[0043] In yet another embodiment, as depicted in FIG. 3, a power transmission assembly 300 hung between two transmission towers (not shown) comprises a conductor assembly 301 comprising a conductor 302 for transmitting current at a selected voltage and a semi-conductive layer 304 surrounding the conductor 302.

[0044] Skilled artisans shall however appreciate that the conductor 302 and the semi-conductive layer 304 are similar in construction respectively to the elements 102 and 104 described with respect to FIG. 1 and hence shall not be described in detail.

[0045] The power transmission assembly 300 further comprises a support structure 308 positioned adjacent to the conductor assembly 301 and coupled to the conductor assembly 301 using at least one two part clamping device 310 so as to strengthen the conductor assembly 301 in order to reduce sagging of the conductor assembly 301.

[0046] The two part clamping device 310 is defined by at least two halves (hereafter referred to as clamps 310a and 310b) that include indentations on each half respectively so as to accommodate the support structure 308 and the conductor assembly 301. The clamps 310a and 310b are placed around the support structure 308 and the conductor assembly 301 along the length at regular intervals spanning a pre-defined distance. The two part clamping device 310 described in this embodiment is for example a glass reinforced polymer.

[0047] The two part clamping device 310 further includes a fastener represented by 316a and 316b for connecting the clamps 310a and 310b in the assembled form. Examples of fasteners include nuts and bolts, screws, pins and rivets. In this embodiment, the fastener presented by 316a and 316b is preferably made of nylon material.

[0048] The power transmission assembly 300 further comprises a first insulting layer 312 and a second insulating layer 314, the first insulating layer 312 covering the semi conductive layer 304 and the second insulating layer 314 covering the support structure 308. In one embodiment, as shown in FIG. 3, the first insulating layer 312 can be a part of the conductor assembly 301.

[0049] Skilled artisans shall however appreciate that the first insulating layer 312 and the second insulting layer 314 are similar in construction to the insulating layer 106 described with respect to FIG. 1 and hence shall not be described in detail.

[0050] In an exemplary embodiment, the support structure 308 comprises aramid fibers that are synthetic fibers constructed of para-bonded aromatic polyamide (aramid) fiber. Further, the thickness of the support structure 308 is approximately 25 millimeter in this embodiment. The support structure 308 is tensioned at dead ends to the required tension of about 8,800 kilograms. However, tensioning of the conductor 302 is optional as the tension maintained in the support structure 308 supports the weight of the conductor assembly 301 and thereby minimizes sag.

[0051] In yet another embodiment, as depicted in FIG. 4, a power transmission assembly 400 hung between two transmission towers (not shown) is described that comprises a support structure 401, a conductor 402 surrounding the support structure 401, the conductor 402 configured for transmitting current at a selected voltage, a semi conductive layer 404 surrounding the conductor 402 and an insulating layer 406 surrounding the semi conductive layer 404.

[0052] Skilled artisans shall however appreciate that, the conductor 402, the semi conductive layer 404 and the insulating layer 406 are similar in construction respectively to the elements 102, 104 and 106 described with respect to FIG. 1 and hence shall not be described in detail.

[0053] The support structure 401 provides structural support for the conductor 402 in order to reduce sagging of the conductor 402 between the two transmission towers. In an exemplary embodiment, the support structure 401 comprises aramid fibers that are synthetic fibers constructed of para-bonded aromatic polyamide (aramid) fiber. Further, the thickness of the support structure is approximately 25 millimeter in this embodiment.

[0054] Further, as an extension to the above mentioned embodiment, an additional support structure can be provided surrounding the insulating layer 406 of the power transmission assembly 400 so as to provide additional strength and insulation for the conductor 402.This is further explained in conjunction with FIG. 5.

[0055] FIG. 5 illustrates apower transmission assembly 500 hung between two transmission towers (not shown)as comprising a conductor assembly 501 comprising a first support structure 502, aconductor 503 surrounding the first support structure 502, the conductor 503 configured for transmitting current at a selected voltage, the conductor 503 comprising at least one strand of conductive material, a semi conductive layer 504 surrounding the conductor 503, the semi conductive layer 504 configured for controlling the electrical stress in the conductor 503 andan insulating layer 506 surrounding the semi conductive layer 504, the insulating layer 506 configured for providing the required level of insulation.

[0056] The power transmission assembly 500 further comprises a second support structure 508, comprising multiple structural elements,surrounding the insulating layer 506 of the conductor assembly 501 such that the first support structure 502together with the second support structure 508 provides structural support for the conductor assembly 501 in order to reduce sagging of the conductor assembly 501 between the two transmission towers.

[0057] The structural elements of the support structure 508 are helically twisted to the insulating layer 506 of the conductor assembly 501. The provision of the additional support in the form of the second support structure 508 reinforces strength in the conductor assembly 501.

[0058] The power transmission assembly 500 may further comprise an outer insulating layer 512 surrounding the support structure 508 so as to provide external protection to the support structure 508.

[0059] Skilled artisans shall however appreciate that the conductor 503, semi conductive layer 504, insulating layers 506 and 512 and support structures 502 and 508 are similar in construction to the elements 102, 104, 106 and 108 explained in conjunction with FIG. 1 and hence shall not be explained in detail.

[0060] Though the support structures 401 and 502 are shown as solid structures respectively in FIG. 4 and FIG. 5, it is to be appreciated that the support structures 401 and 502 can be comprising multiple structural elements that may or may not be helically twisted. Further, positioning the conductor 402 radially external to the support structure 401 and similar positioning of the conductor 503 surrounding the support structure 502 aids in minimizing the skin effect that exists due to the tendency of the alternating electric current to become irregularly distributed within a conductor such that the current density is largest near the surface of the conductor.

[0061] The power transmission assembly 100, 200, 300, 400 and 500 described in the above embodiments is configured for transmitting high voltage that is enabled by providing additional insulation. As known to those skilled in the art, high voltage refers to sub-transmission and transmission of bulk quantities of electric power at voltage such as approximately 115 kV and above to very large consumer base. This additional insulation enables upgrading the transmitted power so as to approximately double the voltage levels transmitted by the existing transmission lines.

[0062] The additional sag that is expected due to increment in weight consequent to the insulation addition is eliminated by introducing the support structure 108, 208, 308,401, 502and 508. The support structure 108, 208, 308, 401, 502 and 508 coupled to the conductor assembly can be tensioned to a desired level that in turn prevents the conductor assembly from sagging. This helps in maintaining and possibly enhancing safety and/or reliability standards with increased transmission voltages by maintaining specified ground clearances.
[0063] The power transmission assembly 100, 200, 300, 400 and 500 described in the above embodiments is economical as there is no need for making significant changes in the existing infrastructure as no additional installation is required and transmitted power can be increased by upgrading the existing infrastructure.

[0064] Further, the power transmission assembly 100, 200, 300, 400 and 500 described herein may lower the transmission losses by reducing corona losses. The reduction in corona losses is a result of decreased electrical stress between the power transmission assembly 100, 200, 300, 400 and 500 and the air when compared to the electrical stress that existed between the bare conductor and the air as described in the prior art power transmission systems. The efficiency of the power transmission assembly 100, 200, 300, 400 and 500 is therefore enhanced.

[0065] Thus, it will be appreciated by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The presently disclosed embodiments are therefore considered in all respects to be illustrative and not restricted. The scope of the invention is indicated by the appended claims rather than the foregoing description and all changes that come within the meaning and range and equivalence thereof are intended to be embraced therein.
,CLAIMS:We Claim :

1. A power transmission assembly (100) hung between two transmission towers, the power transmission assembly (100) comprising:
a conductor assembly (101) comprising:
a conductor (102) for transmitting current at a selected voltage, the conductor (102) comprising at least one strand of conductive material;
a semi conductive layer (104) surrounding the conductor (102), the semi conductive layer (104) configured for controlling the electrical stress in the conductor (102); and
an insulating layer (106) surrounding the semi conductive layer (104), the insulating layer (106)configured for providing the required level of insulation;
and
a support structure (108) comprising multiple structural elements surrounding the insulating layer (106) of the conductor assembly (101) so as to strengthen the conductor assembly (101) in order to reduce sagging of the conductor assembly (101).

2. The power transmission assembly (100) of Claim 1, further comprising an outer insulating layer (112) surrounding the support structure (108) so as to provide external protection to the support structure (108).

3. The power transmission assembly (100) of Claim 1, wherein the structural elements of the support structure (108) are helically twisted to the insulating layer (106) of the conductor assembly (101).

4. A power transmission assembly (200) hung between two transmission towers, the power transmission assembly (200) comprising:
a conductor assembly (201) comprising:
a conductor (202) for transmitting current at a selected voltage, the conductor (202) comprising at least one strand of conductive material;
a semi conductive layer (204) surrounding the conductor (202), the semi conductive layer (204) configured for controlling the electrical stress in the conductor (202); and
an insulating layer (206) surrounding the semi conductive layer (204), the insulating layer (206) configured for providing the required level of insulation;
and
a support structure (208) coupled to the conductor assembly (201) so as to strengthen the conductor assembly (201) in order to reduce sagging of the conductor assembly (201).

5. The power transmission assembly (200) of Claim 4, wherein the conductor assembly (201) and the support structure (208) are helically twisted together to form a strapped assembly.

6. The power transmission assembly (200) of Claim 5, further comprising an outer insulating layer (210) employed for insulating the strapped assembly.

7. The power transmission assembly (200) of Claim 4, further comprising a filler element (212) disposed between the outer insulating layer (210), the support structure (208) and the conductor assembly (201), so as to contribute to the structural formation of the power transmission assembly (200).

8. A power transmission assembly (300) supported by two transmission towers, the power transmission assembly (300) comprising:
a conductor assembly (301) comprising:
a conductor (302) for transmitting current at a selected voltage, the conductor (302) comprising at least one strand of conductive material;
a semi conductive layer (304) surrounding the conductor (302), the semi conductive layer (304) configured for controlling the electrical stress in the conductor (302); and
a first insulating layer (312) surrounding the semi conductive layer (304), the first insulating layer (312) configured for providing required level of insulation;
and
a support structure (308) positioned adjacent to the conductor assembly (301) and coupled to the conductor assembly (301) using at least one two part clamping device (310) so as to strengthen the conductor assembly (301) in order to reduce sagging of the conductor assembly (301).

9. The power transmission assembly (300) of Claim 8, further comprising a second insulating layer (314) covering the support structure (308).

10. A power transmission assembly (400) hung between two transmission towers, the power transmission assembly (400) comprising:
a support structure (401);
a conductor (402) surrounding the support structure (401), the conductor (402) configured for transmitting current at a selected voltage, the conductor (402) comprising at least one strand of conductive material;
a semi conductive layer (404) surrounding the conductor (402), the semi conductive layer (404) configured for controlling the electrical stress in the conductor (402); and
an insulating layer (406) surrounding the semi conductive layer (404), the insulating layer (406)configured for providing required level of insulation;
wherein the support structure (401) provides structural support for the conductor (402) in order to reduce sagging of the conductor (402) between the two transmission towers.

11. A power transmission assembly (500) hung between two transmission towers, the power transmission assembly (500) comprising:
a conductor assembly (501) comprising:
afirst support structure (502);
a conductor (503) surrounding the first support structure (502), the conductor (503) configured for transmitting current at a selected voltage, the conductor (503) comprising at least one strand of conductive material;
a semi conductive layer (504) surrounding the conductor (503), the semi conductive layer (504) configured for controlling the electrical stress in the conductor (503); and
an insulating layer (506) surrounding the semi conductive layer (504), the insulating layer (506)configured for providing the required level of insulation;
and
a second support structure (508) comprising multiple structural elements surrounding the insulating layer (506) of the conductor assembly (501);
wherein the first support structure (501) and the second support structure (508) provide structural support for the conductor assembly (501) in order to reduce sagging of the conductor assembly (501) between the two transmission towers.

12. The power transmission assembly (500) of Claim 11, wherein the structural elements of the support structure (508) are helically twisted to the insulating layer (506) of the conductor assembly (501).

13. The power transmission assembly (500) of Claim 12, further comprising an outer insulating layer (512) surrounding the support structure (508) so as to provide external protection to the support structure (508).

Dated this 24th day of September 2013.
FOR RAYCHEM RPG PVT. LTD.
By their Agent

(GIRISH VIJAYANAND SHETH)
Patent Agent No.: IN/PA 1022
KRISHNA & SAURASTRI ASSOCIATES