Lightning-stroke-resistant aluminum-clad steel stranded wire

Abstract

The utility model provides a lightning-stroke-resistant aluminum-clad steel stranded wire, which comprises a first aluminum-clad steel wire, at least one middle layer and a peripheral layer, the at least one middle layer is arranged on the periphery of the first aluminum-clad steel wire, and any one of the at least one middle layer comprises a plurality of second aluminum-clad steel wires; the peripheral layer is arranged on the periphery of the at least one middle layer and comprises a plurality of third aluminum-clad steel wires; wherein the outer diameter of the third aluminum-covered steel wire is larger than the outer diameter of the first aluminum-covered steel wire and the outer diameter of the second aluminum-covered steel wire, and the ratio of the sectional area of an aluminum layer in the first aluminum-covered steel wire to the total sectional area of the first aluminum-covered steel wire is set to be S1, the ratio of the sectional area of the aluminum layer in the second aluminum-clad steel wire to the total sectional area of the second aluminum-clad steel wire is set as S2, the ratio of the sectional area of the aluminum layer in the third aluminum-clad steel wire to the total sectional area of the third aluminum-clad steel wire is set as S3, and S1 = S2 = S3.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of overhead ground wire, and in particular to a lightning-resistant aluminum-clad steel strand. BACKGROUND

[0002] The overhead ground wire is generally formed by twisting a plurality of aluminum-clad steel strands, and the aluminum-clad steel strand is generally a multi-layer composite structure. Lightning-induced strand breakage often occurs in the overhead ground wire in areas with many or strong lightning, affecting the safety and service life of the overhead ground wire. In areas with many or strong lightning, the overhead ground wire generally increases the outer diameter of the aluminum-clad steel strand to improve its lightning resistance, but this results in an increase in the weight of the entire overhead ground wire, which requires reinforcement and reconstruction or redesign of the line towers, increasing the construction cost of the line. SUMMARY

[0003] The present application provides a lightning-resistant aluminum-clad steel strand to solve the problem of an increase in the weight of the aluminum-clad steel strand when improving its lightning resistance in the known technology.

[0004] The present application provides a lightning-resistant aluminum-clad steel strand, comprising a first aluminum-clad steel strand, at least one intermediate layer, and an outer layer; the at least one intermediate layer is arranged on the outer periphery of the first aluminum-clad steel strand, and any one of the intermediate layers in the at least one intermediate layer comprises a plurality of second aluminum-clad steel strands; the outer layer is arranged on the outer periphery of the at least one intermediate layer, and the outer layer comprises a plurality of third aluminum-clad steel strands; wherein the outer diameter of the third aluminum-clad steel strand is greater than the outer diameter of the first aluminum-clad steel strand and the outer diameter of the second aluminum-clad steel strand, the ratio of the cross-sectional area of the aluminum layer in the first aluminum-clad steel strand to the total cross-sectional area of the first aluminum-clad steel strand is S1, the ratio of the cross-sectional area of the aluminum layer in the second aluminum-clad steel strand to the total cross-sectional area of the second aluminum-clad steel strand is S2, and the ratio of the cross-sectional area of the aluminum layer in the third aluminum-clad steel strand to the total cross-sectional area of the third aluminum-clad steel strand is S3, S1 = S2 = S3.

[0005] In one possible implementation, the number of intermediate layers is one.

[0006] In one possible implementation, the intermediate layer comprises six second aluminum-clad steel strands, and the outer layer comprises ten third aluminum-clad steel strands.

[0007] In one possible implementation, the twisting coverage of the intermediate layer is 101.26%.

[0008] In one possible implementation, the twisting coverage of the outer layer is 98.7%.

[0009] In one possible implementation, the electrical conductivity of the first aluminum-clad steel strand, the second aluminum-clad steel strand, and the third aluminum-clad steel strand is the same.

[0010] In a possible implementation, the conductivities of the first aluminum-clad steel wire, the second aluminum-clad steel wire, and the third aluminum-clad steel wire are all 20%.

[0011] In a possible implementation, the outer diameter of the first aluminum-clad steel wire is 2.35 mm, and the outer diameter of the second aluminum-clad steel wire is 2.35 mm.

[0012] In a possible implementation, the outer diameter of the first aluminum-clad steel wire is 3 mm.

[0013] In a possible implementation, the nominal cross section of the lightning-resistant aluminum-clad steel strand is 100 mm 2 .

[0014] The lightning-resistant aluminum-clad steel strand of the present application, the outer diameter of the third aluminum-clad steel wire of the peripheral layer is greater than the outer diameter of the first aluminum-clad steel wire and the outer diameter of the second aluminum-clad steel wire of the intermediate layer, which can improve the lightning-resistant performance of the entire lightning-resistant aluminum-clad steel strand without changing the electrical performance of the lightning-resistant aluminum-clad steel strand and increasing the self weight. In addition, the proportion of the cross-sectional area of the aluminum layer in the first aluminum-clad steel wire, the second aluminum-clad steel wire, and the third aluminum-clad steel wire to the total cross-sectional area of the corresponding aluminum-clad steel wire is the same, which can ensure the uniformity of the electrical conductivity of the first aluminum-clad steel wire, the second aluminum-clad steel wire, and the third aluminum-clad steel wire, ensure the uniform distribution of the current in each aluminum-clad steel wire, avoid local overload caused by resistance difference, and improve the stability of the lightning-resistant aluminum-clad steel strand during operation. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of the lightning-resistant aluminum-clad steel strand of the present application in an embodiment.

[0016] Figure 2 FIG. 2 is a structural schematic diagram of the lightning-resistant aluminum-clad steel strand of the present application in another embodiment.

[0017] Main element symbol explanation: 100, lightning-resistant aluminum-clad steel strand; 10, first aluminum-clad steel wire; 20, intermediate layer; 21, second aluminum-clad steel wire; 30, peripheral layer; 31, third aluminum-clad steel wire.

[0018] The following detailed description will further illustrate the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0019] The following description will refer to the accompanying drawings to more fully describe the present application. Shown in the drawings are exemplary embodiments of the present application. However, the present application can be implemented in many different forms and should not be interpreted as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present application thorough and complete, and to fully convey the scope of the present application to those skilled in the art. The same reference numbers indicate the same or similar components.

[0020] The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms "including", "includes", "having", "has", "a", "an", "one" or "said" are used in this specification and / or claims, they are intended to be inclusive (meaning that there can be additional features, items, activities, components, and / or steps) and not restrictive (meaning that there is an end to the features, items, activities, components, and / or steps).

[0021] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure and will not be interpreted in an overly literal sense unless expressly so defined herein.

[0022] The overhead ground wire is generally formed by a plurality of aluminum-clad steel wires being twisted into an aluminum-clad steel strand, and the aluminum-clad steel strand is generally a multi-layer composite structure. The overhead ground wire is prone to lightning breakage in a heavy lightning area, which affects the safety and service life of the overhead ground wire. For a heavy lightning area, the overhead ground wire generally increases the outer diameter of the aluminum-clad steel strand to improve its lightning resistance, but this results in an increase in the weight of the entire overhead ground wire, which requires reinforcement and reconstruction or redesign of the line tower, increasing the construction cost of the line.

[0023] The specific embodiments of the application will be further described in detail below with reference to the accompanying drawings.

[0024] As shown in Figure 1 The present embodiment provides a lightning-resistant aluminum-clad steel strand 100, which includes a first aluminum-clad steel wire 10, at least one intermediate layer 20, and an outer layer 30.

[0025] The at least one intermediate layer 20 is arranged on the outer periphery of the first aluminum-clad steel wire 10, and any one of the at least one intermediate layer 20 includes a plurality of second aluminum-clad steel wires 21. The outer layer 30 is arranged on the outer periphery of the at least one intermediate layer 20, and the outer layer 30 includes a plurality of third aluminum-clad steel wires 31.

[0026] The first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31 are all composite structures, that is, the aluminum layer is coated on the outer circumferential surface of the steel core to form the three, and the cross sections of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31 are all circular. The outer diameter of the third aluminum-clad steel wire 31 is greater than the outer diameter of the first aluminum-clad steel wire 10, and the outer diameter of the third aluminum-clad steel wire 31 is greater than the outer diameter of the second aluminum-clad steel wire 21, so as to improve the lightning resistance performance of the lightning-resistant aluminum-clad steel strand 100 by increasing the outer diameter of the third aluminum-clad steel wire 31.

[0027] Further, the ratio of the aluminum layer cross-sectional area to the total cross-sectional area of the first aluminum-clad steel wire 10 is S1, the ratio of the aluminum layer cross-sectional area to the total cross-sectional area of the second aluminum-clad steel wire 21 is S2, and the ratio of the aluminum layer cross-sectional area to the total cross-sectional area of the third aluminum-clad steel wire 31 is S3, S1=S2=S3.

[0028] For the aluminum-clad steel wire, the conductivity of the aluminum-clad steel wire is determined by the cross-sectional area of the aluminum layer, that is, the conductivity of the aluminum-clad steel wire is the ratio of the cross-sectional area of the aluminum layer to the total cross-sectional area of the aluminum-clad steel wire. When S1=S2=S3, the conductivity of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31 is at the same level.

[0029] In this way, the lightning-resistant aluminum-clad steel strand 100 of the present application, the outer diameter of the third aluminum-clad steel wire 31 of the peripheral layer 30 is greater than the outer diameter of the first aluminum-clad steel wire 10 and the outer diameter of the second aluminum-clad steel wire 21 of the intermediate layer 20, which can improve the lightning resistance performance of the entire lightning-resistant aluminum-clad steel strand 100 without changing the electrical performance of the lightning-resistant aluminum-clad steel strand 100 and increasing the self weight. In addition, the ratio of the aluminum layer cross-sectional area to the total cross-sectional area of the corresponding aluminum-clad steel wire is the same in the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31, which can ensure the uniformity of the conductivity of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31, ensure the uniform distribution of the current in each aluminum-clad steel wire, avoid local overload caused by resistance difference, and improve the stability of the lightning-resistant aluminum-clad steel strand 100 during operation.

[0030] Please combine Figure 1 In an embodiment, the number of the intermediate layer 20 is one, that is, the lightning-resistant aluminum-clad steel strand 100 is composed of a composite structure of three aluminum-clad steel wires.

[0031] The number of the first aluminum-clad steel wire 10 is one, and the first aluminum-clad steel wire 10 is located at the center position of the lightning-resistant aluminum-clad steel strand 100.

[0032] The intermediate layer 20 comprises six second aluminum-clad steel wires 21, which are arranged around the outer periphery of the first aluminum-clad steel wire 10, any one of the second aluminum-clad steel wires 21 abutting the outer peripheral surface of the first aluminum-clad steel wire 10, and any two adjacent second aluminum-clad steel wires 21 abutting each other.

[0033] The peripheral layer 30 comprises ten third aluminum-clad steel wires 31, which are arranged around the outer periphery of the intermediate layer 20 comprising the six second aluminum-clad steel wires 21. Any one of the third aluminum-clad steel wires 31 abuts the outer peripheral surface of the adjacent second aluminum-clad steel wire 21, and any two adjacent third aluminum-clad steel wires 31 abut each other.

[0034] In this way, the single first aluminum-clad steel wire 10, the six second aluminum-clad steel wires 21, and the ten third aluminum-clad steel wires 31 are twisted to form a structure with a cross-sectional shape substantially circular, which can ensure the electrical conductivity of the entire lightning-resistant aluminum-clad steel twisted wire 100 formed by twisting.

[0035] In the present embodiment, the twisting coverage of the intermediate layer 20 is 101.26%, the twisting coverage of the peripheral layer 30 is 98.7%, and the tightness of the lightning-resistant aluminum-clad steel twisted wire 100 formed by twisting has a length reduction rate of less than 2% at 30% RTS, further ensuring the electrical conductivity of the lightning-resistant aluminum-clad steel twisted wire 100 and that the weight of the lightning-resistant aluminum-clad steel twisted wire 100 does not change greatly.

[0036] Please refer to Figure 1 In an embodiment, the electrical conductivities of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31 are the same.

[0037] As mentioned above, the ratio of the cross-sectional area of the aluminum layer in the first aluminum-clad steel wire 10 to the total cross-sectional area of the first aluminum-clad steel wire 10 is S1, which can be regarded as the electrical conductivity of the first aluminum-clad steel wire 10. The ratio of the cross-sectional area of the aluminum layer in the second aluminum-clad steel wire 21 to the total cross-sectional area of the second aluminum-clad steel wire 21 is S2, which can be regarded as the electrical conductivity of the second aluminum-clad steel wire 21. The ratio of the cross-sectional area of the aluminum layer in the third aluminum-clad steel wire 31 to the total cross-sectional area of the third aluminum-clad steel wire 31 is S3, which can be regarded as the electrical conductivity of the third aluminum-clad steel wire 31. Among them, S1=S2=S3, that is, the electrical conductivities of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21, and the third aluminum-clad steel wire 31 are the same.

[0038] In this way, by adopting three aluminum-clad steel wires with the same electrical conductivity but different outer diameters to form the lightning-resistant aluminum-clad steel twisted wire 100, not only can the current be uniformly distributed in the three aluminum-clad steel wires, but also the electrical performance of the lightning-resistant aluminum-clad steel twisted wire 100 can be improved without changing the electrical performance of the lightning-resistant aluminum-clad steel twisted wire 100.

[0039] In the embodiment, the conductivities of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21 and the third aluminum-clad steel wire 31 are all 20%.

[0040] It can be understood that in other embodiments, the conductivities of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21 and the third aluminum-clad steel wire 31 can also be 23%, 27%, 30%, 40% or other values, and the specific conductivity can be selected according to the conductivity standard of the lightning-resistant aluminum-clad steel strand 100 in actual application.

[0041] Please also refer to Figure 1 In an embodiment, the outer diameter of the first aluminum-clad steel wire 10 is 2.35 mm, the outer diameter of the second aluminum-clad steel wire 21 is 2.35 mm, and the outer diameter of the first aluminum-clad steel wire 10 is 3 mm.

[0042] In the embodiment, the nominal cross section of the lightning-resistant aluminum-clad steel strand 100 is 100 mm 2 , which meets the size requirements of the aluminum-clad steel strand with a nominal cross section of 100 mm 2 in the national standard GB / T1179. The first aluminum-clad steel wire 10 is LB20-2.35, the second aluminum-clad steel wire 21 is LB20-2.35, and the third aluminum-clad steel wire 31 is LB20-3.0. The unit length mass, rated breaking force, direct current resistance, linear expansion coefficient, short-circuit current and other parameters of the lightning-resistant aluminum-clad steel strand 100 formed by the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21 and the third aluminum-clad steel wire 31 are equivalent to the parameters specified in the original structure of JLB20A-100-19 in the national standard GB / T1179, the lightning-resistant level is improved from less than 150C to 150C, and the construction cost of the tower is not increased.

[0043] It can be understood that in other embodiments, the number of the intermediate layer 20 can be two or more, and the outer diameters of the first aluminum-clad steel wire 10, the second aluminum-clad steel wire 21 and the third aluminum-clad steel wire 31 can be adaptively selected according to the nominal cross section of the aluminum-clad steel strand to be formed.

[0044] Please refer to Figure 2 In other embodiments, taking the size requirements of the aluminum-clad steel strand with a nominal cross section of 100 mm 2 in the national standard GB / T1179 as an example, only the first aluminum-clad steel wire 10 and one intermediate layer 20 can be provided, and the intermediate layer 20 includes six second aluminum-clad steel wires 21. The first aluminum-clad steel wire 10 and the second aluminum-clad steel wire 21 are both LB20-4.3 aluminum-clad steel wires, and the stranding coverage of the intermediate layer 20 is 101.29%, and the tightness is less than 2% at a circumference reduction rate of 30% RTS, which is suitable for 200C lightning-resistant level.

[0045] In the foregoing, specific embodiments of the application have been described with reference to the accompanying drawings. It will, however, be evident that various modifications and changes can be made thereto without departing from the broader spirit and scope of the application as set forth in the appended claims. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. A lightning-resistant aluminum-clad steel stranded wire, characterized in that: The lightning-resistant aluminum-clad steel stranded wire comprises: First aluminum-clad steel wire; at least one intermediate layer provided on the periphery of the first aluminum-clad steel wire, wherein any one of the at least one intermediate layer comprises a plurality of second aluminum-clad steel wires; an outer layer disposed on an outer periphery of the at least one intermediate layer, the outer layer comprising a plurality of third aluminum-clad steel wires; Among them, the outer diameter of the third aluminum-clad steel wire is larger than the outer diameter of the first aluminum-clad steel wire and the outer diameter of the second aluminum-clad steel wire, the ratio of the cross-sectional area of ​​the aluminum layer in the first aluminum-clad steel wire to the total cross-sectional area of ​​the first aluminum-clad steel wire is set to S1, the ratio of the cross-sectional area of ​​the aluminum layer in the second aluminum-clad steel wire to the total cross-sectional area of ​​the second aluminum-clad steel wire is set to S2, and the ratio of the cross-sectional area of ​​the aluminum layer in the third aluminum-clad steel wire to the total cross-sectional area of ​​the third aluminum-clad steel wire is set to S3, S1=S2=S3.

2. The lightning-resistant aluminum-clad steel stranded wire according to claim 1, characterized in that: The number of the intermediate layer is set to one.

3. The lightning-resistant aluminum-clad steel stranded wire according to claim 2, characterized in that: The middle layer includes six of the second aluminum-clad steel wires, and the outer layer includes ten of the third aluminum-clad steel wires.

4. The lightning-resistant aluminum-clad steel stranded wire according to claim 3, characterized in that: The twist coverage of the middle layer is 101.26%.

5. The lightning-resistant aluminum-clad steel stranded wire according to claim 3, characterized in that: The strand coverage of the outer layer is 98.7%.

6. The lightning-resistant aluminum-clad steel stranded wire according to claim 1, characterized in that: The first aluminum-clad steel wire, the second aluminum-clad steel wire, and the third aluminum-clad steel wire have the same electrical conductivity.

7. The lightning-resistant aluminum-clad steel stranded wire according to claim 6, characterized in that: The conductivity of the first aluminum-clad steel wire, the second aluminum-clad steel wire, and the third aluminum-clad steel wire are all 20%.

8. The lightning-resistant aluminum-clad steel stranded wire according to claim 1, characterized in that: The outer diameter of the first aluminum-clad steel wire is 2.35 mm, and the outer diameter of the second aluminum-clad steel wire is 2.35 mm.

9. The lightning-resistant aluminum-clad steel stranded wire according to claim 1, characterized in that: The outer diameter of the first aluminum-clad steel wire is 3 mm.

10. The lightning-resistant aluminum-clad steel stranded wire according to claim 1, characterized in that: The nominal cross-section of the lightning-resistant aluminum-clad steel stranded wire is 100 mm 2 .

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