A combined circular concentric stranded overhead conductor and its structural design method

Abstract

The present invention discloses a method for designing a structure of a combined circular concentric stranded overhead conductor, comprising the following steps: selecting the number of single wires of a conductive wire and the number of single wires of a reinforcing wire; selecting the number of single wire layers of a conductive wire and the number of single wire layers of a reinforcing wire; calculating the number of single wires of a first layer of conductive wires; performing a primary verification on the number of single wires of the conductive wires: verifying whether the calculated number of single wires of the first layer of conductive wires is an integer; calculating the single wire diameter of the conductive wires; calculating the single wire diameter of the reinforcing wires; calculating the cross-sectional area of ​​the reinforcing wires; performing a secondary verification on the number of single wires of the conductive wires: verifying whether the calculated cross-sectional area of ​​the reinforcing wires meets the cross-sectional area requirement of the known reinforcing wires; and determining the structure of the combined circular concentric stranded overhead conductor. The present invention has the characteristics of being simple, fast, and highly practical, and avoids waste caused by repeated trial production.

Description

Technical Field

[0001] The invention relates to the technical field of overhead conductors, in particular to a combined circular concentric stranded overhead conductor and a structural design method thereof. Background Art

[0002] Overhead conductors for transmission lines are usually selected according to system needs, economic current density or system transmission capacity, and compared with the electrical and mechanical properties of different conductor materials and structures. They are determined after comprehensive technical and economic comparison through the annual cost minimum method. At the same time, the allowable current carrying capacity, voltage loss and corona conditions of the conductors need to be verified. The specifications of the selected overhead conductors may be non-standard specifications other than the national standard GB / T1179, so it is necessary to carry out structural design for such special specifications of combined circular concentric stranded overhead conductors. Although there are corresponding design formulas, the corresponding relationship is not clear, and a large amount of data is required for calculation and verification.

[0003] Therefore, there is an urgent need to provide a new type of combined circular concentric stranded overhead conductor and a structural design method thereof to solve the above-mentioned problems existing in the prior art. Summary of the invention

[0004] The purpose of the present invention is to provide a combined circular concentric stranded overhead conductor and a structural design method thereof to solve the problems existing in the above-mentioned prior art, which has the characteristics of simplicity, speed, high practicality, etc. and avoids the waste caused by repeated trial production.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a method for designing a combined circular concentric stranded overhead conductor structure, comprising the following steps:

[0007] S1. Select the number of single wires of the conductive wires and the number of single wires of the reinforcing wires in the combined circular concentric stranded overhead conductor;

[0008] S2. Selecting the number of single-line layers of the conductive wire and the number of single-line layers of the reinforcing wire;

[0009] S3, calculating the number of single wires of the conductive wire material in the first layer;

[0010] S4, verifying the number of single wires of the conductive wires: if the number of single wires of the first layer of the conductive wires calculated in step S3 is an integer, proceeding to the next step; if the number of single wires of the first layer of the conductive wires calculated in step S3 is not an integer, repeating steps S1 to S4, and reselecting the number of single wires of the conductive wires and the number of single wire layers of the conductive wires in step S1 and step S2;

[0011] S5. Calculating the single wire diameter of the conductive wire;

[0012] S6. Calculating the single wire diameter of the reinforcing wire;

[0013] S7, calculating the cross-sectional area of ​​the reinforcing wire;

[0014] S8, performing a secondary verification on the number of single wires of the conductive wire: if the cross-sectional area of ​​the reinforcing wire calculated in step S7 meets the known cross-sectional area requirement of the reinforcing wire, the number of single wires of the conductive wire is determined, and the next step is entered; if the cross-sectional area of ​​the reinforcing wire calculated in step S7 does not meet the known cross-sectional area requirement of the reinforcing wire, steps S1 to S8 are repeated, and the number of single wires of the conductive wire and the number of single wire layers of the conductive wire are reselected in step S1 and step S2;

[0015] S9. Determine the structural distribution of the combined circular concentric stranded overhead conductor.

[0016] Preferably, in step S1, the number of single wires of the conductive wire is n 导 , where n 导 is 6, 7, 8, 9, 10, 11, 12, 18, 22, 24, 30, 42, 45, 48, 54, 72, 76 or 84;

[0017] The number of single wires of the reinforcing wire is n 加 , where n 加 is 7 or 19.

[0018] Preferably, in step S2, the number of single-line layers of the conductive wire is m 导 ,in:

[0019] When n 导 ≤12, m 导 =1;

[0020] When 12<n 导 ≤30, m 导 =2;

[0021] When 30<n 导 ≤54, m 导 =3;

[0022] When 54<n 导 ≤84, m 导 =4;

[0023] The number of single-wire layers of the reinforcing wire is m 加 , when n 加 7 o'clock, m 加 is 1, when n加 19:00, m 加 is 2; where m 加 It is the number of single-wire layers of reinforcing wires other than the center line in the combined circular concentric stranded overhead conductor, and the center line is the reinforcing wire.

[0024] Preferably, the number of single-wire layers of the reinforcing wire is m 加 It is the number of single-wire layers of the reinforcing wire material of the combined circular concentric stranded overhead conductor excluding the center wire.

[0025] Preferably, in step S3, the number of single wires of the conductive wire material in the first layer is n 1 ,in:

[0026] When m 导 =1, n 1 =n 导 ;

[0027] When m 导 =2,

[0028] When m 导 =3,

[0029] When m 导 =4,

[0030] Preferably, in step S5, the cross-sectional area of ​​the conductive wire is known, and the cross-sectional area of ​​the conductive wire is S 导 , Among them, d 导 is the single wire diameter of the conductive wire, which is calculated according to the cross-sectional area of ​​the conductive wire and the number of single wires.

[0031] Preferably, the single wire diameter of the conductive wire is 1.5 mm to 4.8 mm.

[0032] Preferably, in step S6, the single wire diameter of the reinforcing wire is d 加 ;in, n 1 is the number of single wires of the conductive wire material in the first layer.

[0033] Preferably, in step S7, the cross-sectional area of ​​the reinforcing wire is S 加 ;in,

[0034] Preferably, the step S9 further comprises the steps of:

[0035] S91. Calculate the performance of the combined circular concentric stranded overhead conductor; calculate the rated breaking force and 20°C DC resistance of the overhead conductor based on existing parameters and materials used.

[0036] The present invention also discloses a combined circular concentric stranded overhead conductor, which is designed by adopting the above-mentioned combined circular concentric stranded overhead conductor structure design method.

[0037] Compared with the prior art, the present invention has achieved the following beneficial technical effects:

[0038] The present invention can determine the single wire diameter of the conductive wire, the single wire diameter of the reinforcing wire, the single wire number of the conductive wire, the single wire number of the reinforcing wire, the single wire number of the reinforcing wire, the single wire number of the reinforcing wire, the single wire number of the reinforcing wire, the single wire number of the first layer of the conductive wire, and the single wire number of the conductive wire layer, and then can determine the structure of the combined circular concentric stranded overhead conductor. This method has the characteristics of simplicity, speed, high practicality, etc. Moreover, the single wire number of the conductive wire can be verified twice, so as to ensure the reliability of the design method and avoid the waste caused by repeated trial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 The present invention is a flowchart of a method for designing a combined circular concentric stranded overhead conductor structure in an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] The purpose of the present invention is to provide a combined circular concentric stranded overhead conductor and a structural design method thereof to solve the problems existing in the above-mentioned prior art, which has the characteristics of simplicity, speed, high practicality, etc. and avoids the waste caused by repeated trial production.

[0043] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] like Figure 1 As shown, this embodiment provides a method for designing a structure of a combined circular concentric stranded overhead conductor, and takes a combined circular concentric stranded overhead conductor JL / G1A-350 / 45 of a special specification as an example for explanation, wherein the combined circular concentric stranded overhead conductor mainly includes a conductive wire and a reinforcing wire, and aluminum is preferably used as the conductive wire material, and the cross-sectional area S of the conductive wire is 导 =350mm 2 , Steel strand is preferred as the reinforcing wire material, and the cross-sectional area of ​​the reinforcing wire is S 加 =45mm 2 Among them, the materials and cross-sectional areas of the conductive wire and the reinforcing wire can also be selected according to specific work needs.

[0045] Further, in this embodiment, the combined circular concentric stranded overhead conductor structure design method mainly includes the following steps:

[0046] S1. Determine the cross-section calculation formula and the relationship between the single wire diameter of the conductive wire and the single wire diameter of the reinforcing wire:

[0047] Conductive wire cross-sectional area:

[0048] Reinforcement wire cross-sectional area:

[0049] The relationship between the single wire diameter of the conductive wire and the single wire diameter of the reinforcing wire:

[0050] S2. Selecting the number of single wires of the conductive wire and the number of single wires of the reinforcing wire includes the following steps:

[0051] S2.1. Select the number of single wires n of the conductive wire 导 is 19, and the number of single-line layers m of the conductive wire is determined in step S3 导 =2, and in step S4 the number of conductive wires in the first layer is calculated: As verified in step S5, the number of conductive wires in the first layer is n 1 If a decimal appears, it means that the number of single wires of the selected conductive wire does not meet the requirements and needs to be reselected;

[0052] The number of single wires n selected for the conductive wire 导 is 22, and the number of single-line layers m of the conductive wire is determined in step S3 导 =2, in step S4, the number of conductive wires in the first layer is calculated As verified in step S5, the number of conductive wires in the first layer is n 1 is an integer, and the number of single wires n of the conductive wire can be temporarily determined 导 is 22;

[0053] S2.2、Number of single wires commonly used for reinforcing wires 加 7 or 19, that is, the number of single-wire layers of reinforcing wire (except the center line of combined circular concentric stranded overhead conductor) m 加 =1 or 2; specifically, when n 加 =7 o'clock, m 加 =1, when n 加 =19:00, m 加 =2. In the combined circular concentric stranded overhead conductor, multiple layers of wires are arranged from outside to inside in the radial direction, and the center line is a single wire arranged at the center of the circle. The single wire is a reinforcing wire, which is counted in the number of single wires of the reinforcing wires, but not in the number of single wire layers of the reinforcing wires mentioned above; that is, when n 加 =7, the structure is 1+6, the center line (1) is not counted in the number of layers, m 加 =1; when n 加 =19, the structure is 1+6+12, the center line (1) is not counted in the number of layers, m 加 =2.

[0054] S3, select the number of single-line layers of conductive wire m 导 ,in:

[0055] When n 导 ≤12, m 导 =1;

[0056] When 12<n 导 ≤30, m 导 =2;

[0057] When 30<n 导 ≤54, m 导 =3;

[0058] When 54<n 导 ≤84, m 导 =4.

[0059] S4. Calculate the number of single wires n of the first layer (the first layer arranged radially from inside to outside) of the conductive wires 1 ,in:

[0060] When m 导 =1, n 1 =n 导 ;

[0061] When m 导 =2,

[0062] When m 导 =3,

[0063] When m 导=4,

[0064] S5. Number of single wires n for conductive wires 导 Perform a verification: the number of single conductive wires n selected in step S2.1 导 The number of conductive wires in the first layer calculated in step S3 and step S4 is n 1 It must be an integer. If a decimal appears, it means that the selected number does not meet the requirements and needs to be reselected. The number of single wires of the reinforcing wire can be calculated as 7 or 19 respectively.

[0065] S6, single wire diameter d of the conductive wire 导 Calculation of: From formula (1), we can know that

[0066]

[0067] S7: Single wire diameter d of the reinforcing wire 加 Calculation of: From formula (3), we can know that

[0068] When the number of single wires of reinforcing wire is n 加 When there are 7 roots, m 加 =1,

[0069]

[0070] When the number of single wires of reinforcing wire is n 加 When there are 19 roots, m 加 =2,

[0071]

[0072] S8, cross-sectional area S of the reinforcing wire 加 calculate,

[0073] When the number of reinforcing wires is n 加 When the number is 7, When the number of reinforcing wires is n 加 When the number of roots is 19,

[0074] S9. Number of single wires n of conductive wires 导 Perform secondary verification: S calculated in step S8 加7 :34.4mm 2 and S 加19 :33.6mm 2 Neither of them satisfies the cross-sectional area S of the reinforcing wire known in step S1 加 =45mm 2 Requirements (where S 加 =45mm 2For a known standard cross section, the deviation within the range of ±1.5%-1.8% can meet the requirements), and the number of single wires n of the conductive wire needs to be readjusted 导 , repeat steps S2, S3, S4, S5, S6, S7, S8, and S9 until the requirements are met.

[0075] Step S9.1, select the number of single wires n of the conductive wire 导 is: 24, and the number of single-line layers of conductive wires m is determined in step S3 导 =2, the number of single wires of the first layer of conductive wires is calculated in step S4; and the number of single wires of the first layer of conductive wires n is verified by step S5. 1 is an integer, the number of single conductive wires n can be tentatively set to 24;

[0076] S9.2. Number of single reinforcing wires n 加 7 or 19, that is, the number of single-wire layers of reinforcing wire (excluding the center line) m 加 =1 or 2;

[0077] S9.3, Single wire diameter d of the conductive wire 导 Calculation of: From formula (1), we can know

[0078] S9.4, Single wire diameter d of reinforcing wire 加 Calculation of: From formula (3), we can know that

[0079] When the number of reinforcing wires is n 加 When there are 7 roots, m 加 =1,

[0080]

[0081] When the number of reinforcing wires is n 加 When there are 19 roots, m 加 =2,

[0082]

[0083] S9.5, Cross-sectional area S of reinforcing wire 加 calculate,

[0084] When the number of reinforcing wires is n 加 When the number is 7, When the number of reinforcing wires is n 加 When the number of roots is 19,

[0085] S9.6, S calculated in step S9.5 加7 :45.4mm 2 and S加19 :44.3mm 2 All of them can satisfy the cross-sectional area S of the reinforcing wire known in step S1 加 =45mm 2 Requirements; When the number of reinforcing wires is n 加 When there are 7 wires, the cross-sectional area of ​​the reinforcing wire is 45mm due to the standard requirement. 2 , from the perspective of performance indicators and cost analysis, a structure with 7 reinforcing wires is preferred.

[0086] S10. Determination of structure and performance calculation of combined circular concentric stranded overhead conductor:

[0087] Through steps S1, S2, S3, S4, S5, S6, S7, S8, and S9, the single wire diameter d of the conductive wire can be determined. 导 =4.31mm, single wire diameter d of reinforcing wire 加 =2.87mm, number of single conductive wires n 导 :24, the number of single wires of reinforcing wire n 加 : 7, number of layers of reinforcing wire (excluding center line) m 加 =1, the number of single conductive wires in the first layer n 1 =9, then the structure of JL / G1A-350 / 45 is L-type hard aluminum wire: 24 / 4.31, steel strand reinforcing core: 7 / 2.87.

[0088] For regular stranded conductors, the number of single wires in each layer is always 6.28 more than that in the adjacent inner layer. Taking the integer, that is, 6 more, the arrangement of the special specification combined circular concentric stranded overhead conductor JL / G1A-350 / 45 is as follows: along the radial direction from inside to outside, the steel stranded wire (reinforcement wire) reinforcement core: 1+6+duraluminum single wire (conductive wire): 9+15.

[0089] Verification of the number of single wires in the first layer of conductive wires: The number of single hard aluminum wires that can be arranged in the first layer outside the steel strand reinforcement core>n 1 =9, indicating that the structure is reasonable.

[0090] The rated breaking force and 20℃ DC resistance of special specification combined circular concentric stranded overhead conductor JL / G1A-350 / 45 are calculated in accordance with GB / T1179.

[0091] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0092] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for designing a combined circular concentric stranded overhead conductor structure, characterized in that: The following steps are involved: S1. Select the number of single wires of the conductive wires and the number of single wires of the reinforcing wires in the combined circular concentric stranded overhead conductor; S2. Selecting the number of single-line layers of the conductive wire and the number of single-line layers of the reinforcing wire; S3, calculating the number of single wires of the conductive wire material in the first layer; S4, verifying the number of single wires of the conductive wires: if the number of single wires of the first layer of the conductive wires calculated in step S3 is an integer, proceeding to the next step; if the number of single wires of the first layer of the conductive wires calculated in step S3 is not an integer, repeating steps S1 to S4, and reselecting the number of single wires of the conductive wires and the number of single wire layers of the conductive wires in step S1 and step S2; S5. Calculating the single wire diameter of the conductive wire; S6. Calculating the single wire diameter of the reinforcing wire; S7, calculating the cross-sectional area of ​​the reinforcing wire; S8, performing a secondary verification on the number of single wires of the conductive wire: if the cross-sectional area of ​​the reinforcing wire calculated in step S7 meets the known cross-sectional area requirement of the reinforcing wire, the number of single wires of the conductive wire is determined, and the next step is entered; if the cross-sectional area of ​​the reinforcing wire calculated in step S7 does not meet the known cross-sectional area requirement of the reinforcing wire, steps S1 to S8 are repeated, and the number of single wires of the conductive wire and the number of single wire layers of the conductive wire are reselected in step S1 and step S2; S9, determining the structural distribution of the combined circular concentric stranded overhead conductor; In step S1, the number of single wires of the conductive wire is n. 导 , where n 导 is 6, 7, 8, 9, 10, 11, 12, 18, 22, 24, 30, 42, 45, 48, 54, 72, 76 or 84; The number of single wires of the reinforcing wire is n 加 , where n 加 is 7 or 19; In step S2, the number of single-line layers of the conductive wire is m. 导 ,in: When n 导 ≤12, m 导 =1; When 12<n 导 ≤30, m 导 =2; When 30<n 导 ≤54, m 导 =3; When 54<n 导 ≤84, m 导 =4; The number of single-wire layers of the reinforcing wire is m 加 , when n 加 7 o'clock, m 加 is 1, when n 加 19:00, m 加 is 2; where m 加 is the number of single-wire layers of reinforcing wires other than the center line in the combined circular concentric stranded overhead conductor, wherein the center line is the reinforcing wire; In step S3, the number of single wires of the conductive wire material in the first layer is n1, where: When m 导 =1, n1=n 导 ; When m 导 =2, When m 导 =3, When m 导 =4, In step S5, the cross-sectional area of ​​the conductive wire is known, and the cross-sectional area of ​​the conductive wire is S 导 , Among them, d 导 is the single wire diameter of the conductive wire, which is calculated according to the cross-sectional area of ​​the conductive wire and the number of single wires; In step S6, the single wire diameter of the reinforcing wire is d 加 ;in, n1 is the number of single wires of the conductive wire material in the first layer; In step S7, the cross-sectional area of ​​the reinforcing wire is S 加 ;in, 2. The method for designing a combined circular concentric stranded overhead conductor structure according to claim 1, characterized in that: The single wire diameter of the conductive wire is 1.5 mm to 4.8 mm.

3. The method for designing a combined circular concentric stranded overhead conductor structure according to claim 1, characterized in that: The step S9 further comprises the steps of: S91. Calculate the performance of the combined circular concentric stranded overhead conductor; wherein the performance of the combined circular concentric stranded overhead conductor includes at least the rated breaking force and the 20°C DC resistance.

4. A combined circular concentric stranded overhead conductor, characterized in that: The structure is designed by adopting the combined circular concentric stranded overhead conductor structure design method as described in any one of claims 1 to 3.

Images