WO2024007665A1 - Combined circular concentric-stranded overhead conductor and structural design method therefor - Google Patents

Abstract

Disclosed in the present invention are a combined circular concentric-stranded overhead conductor and a structural design method therefor. The method comprises the following steps: selecting the number of single wires of conductive wires and the number of single wires of reinforced wires; selecting the number of layers of the single wires of the conductive wires and the number of layers of the single wires of the reinforced wires; calculating the number of single wires of a first layer of the conductive wires; performing primary verification on the number of single wires of the conductive wires, involving: verifying whether the calculated number of single wires of the first layer of the conductive wires is an integer, and if the number of single wires is an integer, calculating the single-wire diameter of the conductive wire; calculating the single-wire diameter of the reinforced wire; calculating the sectional area of the reinforced wire; and performing secondary verification on the number of single wires of the conductive wires, involving: verifying whether the calculated sectional area of the reinforced wire meets a known sectional-area requirement of the reinforced wire, and if the known sectional-area requirement is met, determining the structure of a combined circular concentric-stranded overhead conductor. The present invention has the characteristics of simplicity, rapidity, high practicability, etc., and waste caused by repeated trial production is avoided.

Description

A combined circular concentric twisted overhead conductor and its structural design method Technical field

The present invention relates to the technical field of overhead conductors, and in particular to a combined circular concentric twisted overhead conductor and a structural design method thereof.

Background technique

Overhead conductors for transmission lines are usually selected according to system needs, economic current density or system transmission capacity. The electrical and mechanical properties of different conductors are compared and selected based on the material structure of the conductors. After comprehensive technical and economic comparison, the minimum annual cost method is used. Confirm; at the same time, it is necessary to verify the allowable current carrying capacity of the conductor, verify the voltage loss, and verify the corona conditions. The selected overhead conductor specifications may be non-standard specifications other than the national standard GB/T1179, so the structural design of such special specifications combined circular concentric twisted overhead conductors is required. Although there are corresponding design formulas, the corresponding relationships are not clear and require a large amount of data for calculation and verification.

Therefore, there is an urgent need to provide a new type of combined circular concentric twisted overhead conductor and its structural design method to solve the above problems existing in the prior art.

Contents of the invention

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

In order to achieve the above objects, the present invention provides the following solutions:

The invention provides a method for designing a combined circular concentric twisted overhead conductor structure, which includes the following steps:

S1. Select the number of single wires of conductive wires and the number of single wires of reinforced wires in the combined circular concentric twisted overhead conductor;

S2. Select the number of single wire layers of the conductive wire material and the number of single wire layers of the reinforcing wire material;

S3. Calculate the number of single wires of the conductive wires in the first layer;

S4. Verify the number of single wires of the conductive wire: if the number of single wires of the first layer of the conductive wire calculated in step S3 is an integer, proceed to the next step; if in step S3 If the calculated number of single wires of the conductive wire material in the first layer is a non-integer, repeat steps S1 to S4, and reselect the number of single wires of the conductive wire material in step S1 and step S2. and the number of single wire layers of the conductive wire;

S5. Calculate the single wire diameter of the conductive wire;

S6. Calculate the single wire diameter of the reinforcing wire;

S7. Calculate the cross-sectional area of the reinforcing wire;

S8. Perform a second 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 requirements of the reinforcing wire, then determine the conductive wire number of single wires, and enter the next step; if the cross-sectional area of the reinforcing wire calculated in step S7 does not meet the known cross-sectional area requirements of the reinforcing wire, repeat steps S1 to S8, and In step S1 and step S2, reselect the number of single wires of the conductive wire and the number of single wire layers of the conductive wire;

S9. Determine the structural distribution of the combined circular concentric twisted overhead conductors.

Preferably, in step S1, the number of single wires of the conductive wire is n _conductors , where n _conductors are 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 _plus , where n _plus is 7 or 19.

Preferably, in step S2, the number of single wire layers of the conductive wire is m _conductive , where:

When n _derivative ≤ 12, m _derivative = 1;

When 12<n _{derivative≤30} , m _derivative =2;

When 30＜n _{derivative≤54} , m _derivative =3;

When 54<n _{derivative≤84} , m _derivative =4;

The number of single wire layers of the reinforcing wire is m _plus . When n _plus is 7, m _plus is 1. When n _plus is 19, m _plus is 2; where m _plus is the combined circular concentric twisted overhead The number of single wire layers of reinforcing wires in the conductor except the center line, which is the reinforcing wire.

Preferably, the number of single wire layers of the reinforcing wire is m _plus the number of single wire layers of the reinforced wire excluding the center line of the combined circular concentric twisted overhead conductor.

Preferably, in step S3, the number of single wires of the conductive wire in the first layer is n ₁ , where:

When m _derivative =1, n ₁ =n _derivative ;

When m _derivative =2,

When m _derivative =3,

When m _derivative =4,

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 _conductivity , Wherein, d _conductivity is the single wire diameter of the conductive wire, and the single wire diameter of the conductive wire is calculated according to the cross-sectional area of the conductive wire and the number of single wires.

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

Preferably, in step S6, the single wire diameter of the reinforcing wire is d _plus ; wherein, n ₁ is the number of single wires of the conductive wire in the first layer.

Preferably, in step S7, the cross-sectional area of the reinforcing wire is S _plus ; wherein,

Preferably, step S9 also includes the steps:

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

The invention also discloses a combined circular concentric strand overhead conductor, which is designed using the above-mentioned combined circular concentric strand overhead conductor structure design method.

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

The invention can determine the single wire diameter of the conductive wire, the single wire diameter of the reinforcing wire, the number of single wires of the conductive wire, the number of single wires of the reinforcing wire, the number of single wire layers of the reinforcing wire, the number of single conductive wires in the first layer, the number of single conductive wires The number of layers can then be determined to determine the structure of the combined circular concentric twisted overhead conductors. Structure, this method is simple, fast, and highly practical; moreover, it can conduct secondary verification of the number of single wires of the conductive wire, ensuring the reliability of the design method and avoiding waste caused by repeated trial production.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a method for designing a combined circular concentric twisted overhead conductor structure in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

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

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, this embodiment provides a method for designing a combined circular concentric stranded overhead conductor structure. The special specification combined circular concentric stranded overhead conductor JL/G1A-350/45 is used as an example for illustration, where, The combined circular concentric stranded overhead conductor mainly includes conductive wires and reinforced wires. Aluminum is preferred as the conductive wire material. The cross-sectional area of the conductive wire is S ₌ 350mm ^2. Steel strands are preferably used as the reinforced wire material. The cross-sectional area of the reinforced wire is S. _Add =45mm ² . Among them, the materials and cross-sectional areas of conductive wires and reinforcing wires can also be selected according to specific work needs.

Further, in this embodiment, the combined circular concentric strand overhead conductor structure design method mainly includes the following steps:

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:

Cross-sectional area of conductive wire:

Strengthen wire cross-sectional area:

The relationship between the single wire diameter of conductive wire and the single wire diameter of reinforced wire:

S2. Select the number of single wires of conductive wires and the number of single wires of reinforcing wires: including the following steps:

S2.1. Select the number n of single wires of conductive wires to _be 19. In step S3, determine the number of single wire layers of conductive wires m _conductivity = 2. In step S4, calculate the number of conductive wires in the first layer: After verification in step S5, the number n ₁ of the first layer of conductive wires appears as a decimal, indicating that the number of single wires of the selected conductive wires does not meet the requirements and needs to be reselected;

Select the number n of single wires of conductive wires to _be 22, determine the number of single wire layers of conductive wires m _conductivity = 2 in step S3, and calculate the number of conductive wires in the first layer in step S4. After verification in step S5, the number of conductive wires n ₁ in the first layer is an integer, and the number n of single conductive wires can be tentatively _determined to be 22;

S2.2. The number n of commonly used single wires of reinforced wires _{is added} to 7 or 19, that is, the number of single wire layers of reinforced wires (except the center line of combined circular concentric twisted overhead conductors) m _plus = 1 or 2; specifically, when n When _add =7, _madd =1, and when _nadd =19, _madd =2. Among them, the combined circular concentric twisted overhead conductors are provided with multiple layers of wires from the outside to the inside in the radial direction. The center line is a single wire set at the center of the circle. This single wire is a reinforcing wire. This single wire is counted in the number of single wires of the reinforcing wire. , but it is not counted in the number of single wire layers of the above-mentioned reinforcing wires; that is, when n _plus = 7, the structure is arranged in 1+6, the center line (1) is not counted in the number of layers, m _plus = 1; when n _plus = At 19 o'clock, the structure is arranged in 1+6+12, the center line (1) does not count the number of layers, m _plus = 2.

S3. Select the number of single wire layers m _conductors of the conductive wire, where:

When n _derivative ≤ 12, m _derivative = 1;

When 12<n _{derivative≤30} , m _derivative =2;

When 30＜n _{derivative≤54} , m _derivative =3;

When 54<n _{derivative≤84} , m _derivative =4.

S4. Calculate the number n ₁ of single wires of the conductive wires in the first layer (the first layer arranged from the inside to the outside in the radial direction), where:

When m _derivative =1, n ₁ =n _derivative ;

When m _derivative =2,

When m _derivative =3,

When m _derivative =4,

S5. Perform a _{verification on} the number n of single wires of conductive wires: the number n of single _wires of conductive wires selected in step S2.1 and the number n of conductive wires in the first layer calculated through steps S3 and S4 must be ₁ It is 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 reinforced wire can be calculated as 7 and 19 respectively.

S6. _Calculation of the single wire diameter d of conductive wire: It can be known from formula (1),

S7: Calculation of the single wire diameter d _plus of the reinforced wire: It can be known from formula (3),

When the number n of single wires of reinforcing wires _{is added} to 7, m _plus =1,

When the number n of single wires of reinforcing wires _{is added} to 19, m _plus = 2,

S8. _Strengthen the calculation of the cross-sectional area S of the wire.

When the number n of single reinforcing wires _{is added} to 7, When the number n of single reinforcing wires _{is added} to 19,

S9. Perform a secondary verification on the number of single wires n _conductors of the conductive wire: neither S _{plus 7} :34.4mm ² nor S _{plus 19} :33.6mm ² calculated in step S8 meet the known strengthening wires in step S1. The cross-sectional area S _plus = 45mm ² is required (where S _plus = 45mm ² is a known standard cross-section, and the deviation can meet the requirements within the range of ±1.5%-1.8%), the _number of single wires n conductors of the conductive wire needs to be readjusted, repeat Steps S2, S3, S4, S5, S6, S7, S8, S9 until the requirements are met.

Step S9.1. _Select the number n of single wires of conductive wires: 24. In step S3, determine the number of single wire layers of conductive wires m _conductivity = 2. In step S4, calculate the number of single wires of the first layer of conductive wires. ; After verification in step S5, the number n of single wires of the first layer of conductive wires is an _integer , and the number n of single wires of conductive wires can be tentatively determined to be 24;

S9.2. The number n of single wires of reinforced wires _{is added} to: 7 or 19, that is, the number of single wire layers of reinforced wires (excluding the center line) m _plus = 1 or 2;

S9.3. Calculation of the single wire diameter d of _conductive wire: it can be known from formula (1)

S9.4. Calculation of the single wire diameter d _plus of the reinforced wire: It can be known from formula (3),

When the number n of single reinforced wires _{is added} to 7, m _plus = 1,

When the number n of single reinforcing wires _{is added} to 19, m _plus = 2,

S9.5. _Strengthen the calculation of the cross-sectional area S of the wire.

When the number n of single reinforcing wires _{is added} to 7, When the number n of single reinforcing wires _{is added} to 19,

S9.6. Both S _{plus 7} : 45.4mm ² and S _{plus 19} : 44.3mm ² calculated in step S9.5 can meet the requirements of the cross-sectional area S _plus = 45mm ² of the reinforcing wire known in step S1. ; When the number n of single reinforcing wires _{is increased} to 7, the cross-sectional area of the reinforcing wires is 45mm ² as required by the standard. Therefore, the structure of 7 reinforcing wires is preferred based on performance indicators and cost analysis.

S10. Structure determination and performance calculation of combined circular concentric twisted overhead conductors:

Through steps S1, S2, S3, S4, S5, S6, S7, S8 and S9, it can be determined that the single wire _diameter d of the conductive wire = 4.31mm, the single wire diameter d of the reinforced wire = 2.87mm, and the number _of single wires of the conductive wire n _conductors : 24, the number of single wires of reinforcing wires n _plus : 7, the number of layers of reinforcing wires (except the center line) m _plus = 1, the number of single wires of conductive wires on the first layer n ₁ = 9, then JL/ The structure of G1A-350/45 is L-shaped duralumin wire: 24/4.31, steel strand reinforced core: 7/2.87.

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

Verification of the number of single wires of the first layer of conductive wires: the number of duralumin single wires that can be arranged on the first layer outside the steel strand reinforced core is > n ₁ = 9, indicating that this structure is reasonable.

The calculation method for the rated breaking force and 20°C DC resistance of the special specification combined circular concentric twisted overhead conductor JL/G1A-350/45 is calculated according to GB/T1179.

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 the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. . Therefore, the embodiments should be regarded as illustrative and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is therefore intended that all claims falling within the claims All changes within the meaning and scope of equivalent elements are encompassed by the present invention, and any reference signs in a claim should not be construed as limiting the claim involved.

Specific examples are used in the present invention to illustrate the principles and implementation modes of the present invention. The description of the examples is only used to help understand the method and the core idea of the present invention; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation and application scope based on the idea of the present invention. In summary, the contents of this description should not be construed as limitations of the present invention.

Claims (10)

1. A method for designing a combined circular concentric twisted overhead conductor structure, which is characterized by: including the following steps:

   S1. Select the number of single wires of conductive wires and the number of single wires of reinforced wires in the combined circular concentric twisted overhead conductor;

   S2. Select the number of single wire layers of the conductive wire material and the number of single wire layers of the reinforcing wire material;

   S3. Calculate the number of single wires of the conductive wires in the first layer;

   S4. Verify the number of single wires of the conductive wire: if the number of single wires of the first layer of the conductive wire calculated in step S3 is an integer, proceed to the next step; if in step S3 If the calculated number of single wires of the conductive wire material in the first layer is a non-integer, repeat steps S1 to S4, and reselect the number of single wires of the conductive wire material in step S1 and step S2. and the number of single wire layers of the conductive wire;

   S5. Calculate the single wire diameter of the conductive wire;

   S6. Calculate the single wire diameter of the reinforcing wire;

   S7. Calculate the cross-sectional area of the reinforcing wire;

   S8. Perform a second 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 requirements of the reinforcing wire, then determine the conductive wire number of single wires, and enter the next step; if the cross-sectional area of the reinforcing wire calculated in step S7 does not meet the known cross-sectional area requirements of the reinforcing wire, repeat steps S1 to S8, and In step S1 and step S2, reselect the number of single wires of the conductive wire and the number of single wire layers of the conductive wire;

   S9. Determine the structural distribution of the combined circular concentric twisted overhead conductors.
2. The combined circular concentric twisted overhead conductor structure design method according to claim 1, characterized in that: in the step S1, the number of single wires of the conductive wire material is n _conductors , wherein n _conductors are 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 _plus , where n _plus is 7 or 19.
3. The combined circular concentric twisted overhead conductor structure design method according to claim 2, which is characterized by The characteristic is that in step S2, the number of single wire layers of the conductive wire is m, _where :

   When n _derivative ≤ 12, m _derivative = 1;

   When 12<n _{derivative≤30} , m _derivative =2;

   When 30＜n _{derivative≤54} , m _derivative =3;

   When 54<n _{derivative≤84} , m _derivative =4;

   The number of single wire layers of the reinforcing wire is m _plus . When n _plus is 7, m _plus is 1. When n _plus is 19, m _plus is 2; where m _plus is the combined circular concentric twisted overhead The number of single wire layers of reinforcing wires in the conductor except the center line, which is the reinforcing wire.
4. The method for designing a combined circular concentric twisted overhead conductor structure according to claim 3, characterized in that in step S3, the number of single wires of the conductive wires in the first layer is n ₁ , where:

   When m _derivative =1, n ₁ =n _derivative ;

   When m _derivative =2,

   When m _derivative =3,

   When m _derivative =4,
5. The combined circular concentric twisted overhead conductor structure design method according to claim 3, characterized in that: in the step S5, the cross-sectional area of the conductive wire material is known, and the cross-sectional area of the conductive wire material is S _conductor , Wherein, d _conductivity is the single wire diameter of the conductive wire, and the single wire diameter of the conductive wire is calculated according to the cross-sectional area of the conductive wire and the number of single wires.
6. The method for designing a combined circular concentric twisted overhead conductor structure according to claim 5, characterized in that: the single wire diameter of the conductive wire material is 1.5 mm to 4.8 mm.
7. The combined circular concentric twisted overhead conductor structure design method according to claim 5, characterized in that: in the step S6, the single wire diameter of the reinforcing wire is d _plus ; wherein, n ₁ is the number of single wires of the conductive wire in the first layer.
8. The combined circular concentric twisted overhead conductor structure design method according to claim 7, which is characterized by The characteristic lies in: in the step S7, the cross-sectional area of the reinforcing wire is S _plus ; where,
9. The combined circular concentric twisted overhead conductor structure design method according to claim 1, characterized in that step S9 further includes the steps:

   S91. Calculate the performance of the combined circular concentrically twisted overhead conductor; wherein the performance of the combined circular concentrically twisted overhead conductor includes at least the rated breaking force and 20°C DC resistance.
10. A combined circular concentric strand overhead conductor is characterized in that it is designed using the combined circular concentric strand overhead conductor structure design method as described in any one of claims 1-9.