CN118211288A - Method for precisely selecting single wire diameter of conductor before twisting and compacting under given resistance condition - Google Patents
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- 239000004020 conductor Substances 0.000 title claims abstract description 266
- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 28
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 22
- 229910052782 aluminium Inorganic materials 0.000 claims description 22
- 238000004364 calculation method Methods 0.000 claims description 15
- 238000012545 processing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 17
- 238000013461 design Methods 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004870 electrical engineering Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The invention discloses a method for precisely selecting the diameter of a single wire of a conductor before twisting and compacting under the condition of given resistance, which comprises the following steps: s1: selecting experience parameters and conductor parameters, and calculating the single wire diameter of the conductor before primary twisting and compacting; s2: detecting the conductor resistance of the twisted and compressed primary selected single wire, comparing the conductor resistance with a standard specified maximum value, confirming the diameter of the primary selected single wire as a process set value if the diameter is within a preset range, and performing step S3 if the diameter is not within the preset range; s3: calculating the true value of the product of the empirical parameters of the stranded compacted conductor by adopting the measured value of the conductor resistance after the primary single wire stranding and compacting; s4: and under the given conductor resistance condition, calculating the single wire diameter of the conductor before twisting and compacting by adopting the true value of the empirical parameter product of the twisted and compacted conductor. The invention can achieve the purpose of accurately designing the diameter of the single wire of the stranded compressed conductor under the condition of given conductor resistance.
Description
Technical Field
The invention relates to the technical field of wire and cable conductor design, in particular to a method for precisely selecting the diameter of a single wire of a conductor before twisting and compacting under the condition of given resistance.
Background
The stranded conductor is classified into a stranded non-compacted conductor and a stranded compacted conductor, wherein the stranded non-compacted conductor has one of a stranded non-compacted round conductor, and the stranded compacted conductor has three of a stranded compacted round conductor, a stranded compacted fan-shaped conductor and a stranded compacted corrugated conductor. The purpose of the conductor twisting and compacting is to reduce the void area and the external connection area of the twisted conductor, thereby reducing the void area of a cable core and the outer diameter of a cable, reducing the consumption of nonmetallic materials of the cable and simultaneously reducing the space occupied by the cable laying.
In the material cost of the power cable with the twisted compressed conductors, the material cost of the conductors accounts for 95% or more of the total cost of the cable material on average, so that the adoption of the optimal economic technical scheme to select the single-wire diameter of the conductors before twisting and compressing on the premise of ensuring that the cable conductors meet the technical requirements (conductor resistance) of products is an important task target of the structural design of the power cable.
For a long time, the wire and cable industry selects the diameter of a single wire in a stranded compressed (or non-compressed) conductor by selecting an empirical parameter calculation method, and deducing and calculating the diameter of the single wire in the stranded compressed (or non-compressed) conductor by adopting a conductor resistance complete calculation formula recommended in the 2.2 nd conductor resistance of the second chapter of the electric wire and cable handbook of China. The manual is composed of a Shanghai cable institute, a China electrical engineering society, an electric wire and cable assembly, wu Changshun main codes, a mechanical industry publishing company, 3 rd edition, first printing of 2017, 8 th month, and standard book numbers: ISBN 978-7-111-57463-7, the single wire diameter in the conductor is specifically deduced as follows:
The complete calculation formula of the conductor resistance at 20 ℃ is as follows:
- - (1); wherein the cross-sectional area of the conductor before twisting and compacting The calculation method for the single wire diameter d 0 in the conductor before (or not) strand compaction is deduced as follows: - - (2); wherein d 0 represents the single wire diameter of the conductor before stranding and compacting, and the unit is: performing a mm; ρ 20 represents the resistivity of the conductor material at 20 ℃, the copper conductor is 0.017241 Ω·mm 2/m, and the copper-clad aluminum is 0.02676 Ω·mm 2/m; l-cable unit length, unit: km or m; the number of single wires in the Z-conductor is specified by the product standard; r 20 -when the conductor resistance at 20 ℃ is designed and the diameter of a single wire in a conductor is accurately selected, the design given value of the copper core conductor resistance is less than 1% of the maximum value specified by the standard, and the design given value of the copper-clad aluminum conductor resistance is less than 1.5% of the maximum value specified by the standard, and the unit is omega/km.
K 1 is an empirical value parameter which is larger than 1 and is introduced by the increase of resistivity caused in the single wire processing process in the conductor, and differences of conductor processing technology, material performance and the like can influence the value of k 1; k 2 is the average twisting coefficient of single wires in the conductor, and the value of k 2 is an approximate value because the twisting pitch ratio of each layer of the conductor with different specifications is different; k 3 is an empirical value parameter which is greater than 1 and is introduced by increasing the resistivity caused by the hardening of the conductor, wherein the mechanical property difference of single conductor wires is different when the conductor is not compacted and stranded conductor is compacted and k 3 is 1), and the value of k 3 is influenced by the different conductor compacting process and compacting coefficient; k 4 is the cable core (insulated conductor) cabling twist coefficient value, and is related to the outer diameter and twist pitch of the cable; k 5 is an empirical value parameter which is larger than 1 and is introduced by single line allowable tolerance, and different production equipment, conductor materials and performances can have influence on the value of k 5.
K 1 、k2、k3、k4、k5 is an empirically-valued parameter (i.e., an empirical parameter) that comprehensively reflects the increase in resistivity of the conductor material caused by wire processing and lay compaction (k 1 and k 3), the increase in wire length caused by conductor lay and core cabling (k 2 and k 4), and the change in wire diameter caused by allowable tolerances of the conductor wire (k 5) during the overall process of wire production and lay compaction. Because the value of k 1 、k2、k3、k4、k5 is influenced by the differences and changes of the types and performances of conductor materials, the technological equipment and technological methods and the conductor structure (single wire number/single wire diameter), the actual measurement value of the twisted compressed conductor resistance of the twisted compressed conductor single wire (diameter d 0) which is selected by calculating the value of k 1 、k2、k3、k4、k5 according to the recommendation of the electric wire and cable handbook or by adopting experience in the electric wire and cable industry deviates greatly from the maximum value R max of the conductor resistance specified by the standard, namely the actual measurement value of the copper core conductor cannot meet the structural design requirement of the conductor under the optimal economic technical condition which is less than 1.5% of the maximum value R max specified by the standard, and the actual measurement value of the copper core conductor cannot meet the structural design requirement of the conductor under the optimal technical condition which is less than 1.5% of the maximum value R max specified by the standard. The result is that: the measured value of the conductor resistance is too small, and the diameter of the selected single wire is too large, so that the cost of the conductor material is increased; if the measured value of the conductor resistance is too large, the conductor performance may be failed.
According to the existing method and technology, the calculated single wire diameter and the actual measured resistance of the stranded compacted conductor are required to be smaller than the maximum value R max specified by the standard, so that the conductor structure design selection meets the optimal economic and technical conditions, calculation parameter selection, single wire diameter calculation, stranded compacted conductor resistance detection, experience parameter adjustment, single wire diameter calculation after adjustment, and repeated cycle process of single wire stranded compacted conductor resistance detection after adjustment are required, which not only takes quite long time, but also causes a great deal of conductor material waste.
Disclosure of Invention
The invention aims to provide a method for precisely selecting the diameter of a single wire of a conductor before twisting and compacting under the condition of given resistance, which aims to solve the technical problem of how to precisely and simply calculate and select the design requirement of the diameter of the single wire before twisting and compacting.
The invention aims at adopting the following technical scheme: the method for precisely selecting the single wire diameter of the conductor before twisting and compacting under the given resistance condition comprises the following steps:
S1: selecting experience parameters and conductor parameters, and calculating the single wire diameter of the conductor before primary twisting and compacting;
s2: detecting the conductor resistance of the twisted and compressed primary selected single wire, comparing the conductor resistance with a standard specified maximum value, confirming the diameter of the primary selected single wire as a process set value if the diameter is within a preset range, and performing step S3 if the diameter is not within the preset range;
S3: calculating the true value of the product of the empirical parameters of the stranded compacted conductor by adopting the measured value of the conductor resistance after the primary single wire stranding and compacting;
S4: and under the given conductor resistance condition, calculating the single wire diameter of the conductor before twisting and compacting by adopting the true value of the empirical parameter product of the twisted and compacted conductor.
Further, the empirical parameters include k 1 、k2、k3、k4、k5, wherein,
K 1 represents an empirical value parameter greater than 1 introduced by an increase in resistivity caused during single wire processing in a conductor;
k 2 represents the single wire average twist in coefficient in the conductor;
k 3 represents an empirical value parameter greater than 1 introduced by the increase in resistivity caused by the compression and hardening of the conductor;
k 4 represents a cable core cabling twist coefficient;
k 5 represents an empirically derived parameter greater than 1 that is introduced by a single line tolerance.
Further, the conductor parameters include a conductor resistance R 20 at 20 ℃, a conductor resistivity ρ 20, a cable conductor unit length L, and a twisted compacted conductor single wire number Z.
Further, the single wire diameter of the conductor before primary twisting and compacting is calculated according to the following calculation formula:
。
further, step S2 includes the following sub-steps:
S21: the first selected single wires are made into stranded compressed conductors according to a specified number Z, and the resistance R 20' of the stranded compressed conductors is detected;
S22: and comparing the stranded compressed conductor resistance R 20' with a maximum value of a standard specified conductor resistance, judging whether the stranded compressed conductor resistance is in a preset range, and if so, selecting the primary single wire diameter d 0 as a process set value.
Further, the stranded compressed conductor comprises a copper core conductor, the measured value of the resistance of the copper core conductor is compared with the specified maximum value R max of the resistance standard of the copper core conductor, and if the measured value of the resistance of the copper core conductor is less than 1% of the specified maximum value R max of the resistance standard of the copper core conductor, the diameter d 0 of the primary selected single wire is selected as a process set value.
Further, the stranded compressed conductor comprises a copper-clad aluminum conductor, the measured value of the resistance of the copper-clad aluminum conductor is compared with a maximum value R max 'specified by a copper-clad aluminum conductor resistance standard, and if the measured value of the resistance of the copper-clad aluminum conductor is less than 1.5% of the maximum value R max' specified by the copper-clad aluminum conductor resistance standard, the diameter d 0 of the initially selected single wire is selected as a process set value.
Further, the method comprises the steps of,
The method for calculating the true value of the empirical parameter product of the stranded compressed conductor comprises the following steps:
；
Where k n' is the true value of the empirical parameter product of stranded compacted conductor, k n, k n=k1 ×k2×k3×k4×k5.
Further, the method for calculating the single wire diameter of the conductor before twisting and compacting by adopting the true value of the empirical parameter product of the twisted and compacted conductor comprises the following steps:
。
The invention has the beneficial effects that: the method adopts the true value of the product of the empirical parameters of the stranded compressed conductor to calculate and select the diameter of the single wire of the stranded compressed conductor before stranded compression, achieves the aim of accurately designing the diameter of the single wire of the stranded compressed conductor under the condition of given conductor resistance, is simple, convenient and quick, avoids the defects of long period and more waste of conductor materials of the existing method, and is an optimal economic technology selection method for the cable conductor structure combining theory and application technology.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, the method for precisely selecting the diameter of a single wire of a conductor before twisting and compacting under the given resistance condition comprises the following steps:
S1: selecting experience parameters and conductor parameters, and calculating the single wire diameter of the conductor before primary twisting and compacting;
s2: detecting the conductor resistance of the twisted and compressed primary selected single wire, comparing the conductor resistance with a standard specified maximum value, confirming the diameter of the primary selected single wire as a process set value if the diameter is within a preset range, and performing step S3 if the diameter is not within the preset range;
S3: calculating the true value of the product of the empirical parameters of the stranded compacted conductor by adopting the measured value of the conductor resistance after the primary single wire stranding and compacting;
S4: and under the given conductor resistance condition, calculating the single wire diameter of the conductor before twisting and compacting by adopting the true value of the empirical parameter product of the twisted and compacted conductor.
In this embodiment, the empirical parameters include k 1 、k2、k3、k4、k5, which is related to the actual situation of using material properties, process methods, production equipment and conductor structures, wherein k 1 represents an empirical value parameter of greater than 1 introduced by the resistivity increase caused during single wire processing in the conductor; k 2 represents the single wire average twist in coefficient in the conductor; k 3 represents an empirical value parameter greater than 1 introduced by the increase in resistivity caused by the compression and hardening of the conductor; k 4 represents a cable core cabling twist coefficient; k 5 represents an empirically derived parameter greater than 1 that is introduced by a single line tolerance. The conductor parameter data comprises a conductor resistance R 20 at 20 ℃ (the conductor resistance is selected according to the specification of table 1 when the copper core conductor or the copper-clad aluminum conductor is designed to be given at 20 ℃), a conductor resistivity rho 20 (the copper conductor resistivity is 0.017241 omega-mm 2/m, the copper-clad aluminum conductor resistivity is 0.02676 omega-mm 2/m), a cable conductor unit length L (1 km) and a stranding compressed conductor single wire number Z.
TABLE 1 conductor resistance criteria maximum specified and design setpoint
。
Calculating the single wire diameter of the conductor before primary twisting and compacting according to the following calculation formula:
。
in this embodiment, step S2 includes the following sub-steps:
S21: the first selected single wires are made into stranded compressed conductors according to a specified number Z, and the resistance R 20' of the stranded compressed conductors is detected;
S22: the stranded compacted conductor resistance R 20' is compared with the standard specified conductor resistance maximum in table 1 and judged if it is within the preset range, if so, the primary selected single wire diameter d 0 is selected.
Specifically, when the twisted compacted conductor is a copper core conductor, the measured value of the resistance of the copper core conductor is compared with the maximum value R max specified by the copper core conductor resistance standard in table 1, and if the measured value of the resistance of the copper core conductor is less than 1% of the maximum value R max specified by the copper core conductor resistance standard, the single wire diameter d 0 of the conductor before twisting and compacting which is initially selected can be determined to meet the optimal economic and technical selection requirement of the conductor structure. When the twisted compressed conductor is a copper-clad aluminum conductor, comparing the measured value of the resistance of the copper-clad aluminum conductor with the maximum value R max 'specified by the copper-clad aluminum conductor resistance standard in table 1, and if the measured value of the resistance of the copper-clad aluminum conductor is less than 1.5% of the maximum value R max' specified by the copper-clad aluminum conductor resistance standard, determining that the diameter d 0 of the single wire of the conductor before the twisted compressed conductor is initially selected meets the optimal economic and technical selection requirement of the conductor structure.
For the reasons stated above, due to the differences in the mechanical properties of the conductor materials used in the process equipment and process methods between the individual cable manufacturers, the selected empirical parameter k 1 、k2、k3、k4、k5 differs greatly from the actual parameter of the stranded conductor (k 1 ′、k2′、k3′、k4′、k5 ') which results in a greater deviation of the measured value R 20' of the resistance of the initially selected single wire (diameter d 0) from the standard specified resistance maximum R max, as a result of which: when the measured conductor resistance R 20' is too small, the primary single wire diameter d 0 is too large, so that the cost of the conductor material is increased; when the measured conductor resistance R 20' is too large, the conductor performance may be unacceptable. According to the calculation and analysis, in order to accurately calculate the single wire diameter of the conductor before twisting and compacting under the condition of given conductor resistance, the actual measured value of the twisted and compacted conductor resistance reaches the design requirement, and the actual value (k 1 ′、k2′、k3′、k4′、k5') of the empirical parameter of the twisted and compacted conductor is deduced by a special method as a key link.
And deducing and calculating the actual value of the empirical parameter of the stranded conductor by adopting the actual measured value of the conductor resistance:
Order the Then:
- - (3); substituting the primary single wire diameter d 0, the primary single wire (diameter d 0) twisted conductor actual measurement resistance R 20', the number Z of the twisted conductor single wires, the resistivity rho 20 of the conductor material and the conductor unit length L, the method comprises the following steps: /(I) - - (4); Wherein, since ρ 20, L are both prescribed constant, Z is also constant for the selected conductor section. d 0 is the calculated diameter of the single wire of the selected twisted compacted conductor, R 20 'is the measured value of the resistance of the twisted conductor of the selected single wire (diameter d 0), and k n' is the product of the empirical values of the twisted compacted conductor (k 1 ′、k2′、k3′、k4′、k5 '), i.e., k n′=k1 ′×k2′×k3′×k4′×k5'.
Accurately calculating and selecting the diameter d 0 'of the single wire of the conductor before twisting and compacting under the condition of designing the given conductor resistance R 20 by adopting the real k n': - - (5); replacing k n,ρ20, z and L with true k n ' still being original selected constants, and R 20 being original design given conductor resistance value, the formula of stranding pre-compacting conductor single wire diameter d 0 ' under the condition of calculating and selecting given conductor resistance R 20 by adopting true k n ' can be obtained: /(I) ---（6）。
Through a large number of experiments and verification, a single wire (diameter d 0 ') is calculated by adopting a real k n' value to prepare a stranded compressed conductor, the actual measurement values of the copper core stranded compressed conductor resistance are all in a range which is smaller than 1% of the standard specified conductor resistance maximum value R max, and the actual measurement values of the copper-clad aluminum core stranded compressed conductor resistance are all in a range which is smaller than 1.5% of the standard specified conductor resistance maximum value R max. In summary, the diameter of the stranded compressed conductor single wire is calculated and selected by adopting the real k n', so that the purpose of accurately designing the diameter of the stranded compressed conductor single wire under the condition of given conductor resistance is achieved, meanwhile, the method is simple, convenient and quick, the defects that the existing method is long in period and wastes more conductor materials are avoided, and the method is an optimal economic technology selection method for the cable conductor structure combining theory and application technology.
The invention is further illustrated by the following examples: the method comprises the steps of substituting (2) the single wire diameter d 0 of a primary selected copper core and copper-clad aluminum core twisted compressed conductor and the actual measured resistance R 20 'of the primary selected copper core and copper-clad aluminum core twisted compressed conductor into (4), calculating to obtain the true value k n' of the empirical parameter product (k n), substituting (6) the true value k n ', and calculating to obtain the accurate calculation selected copper core and copper-clad aluminum core twisted compressed single wire diameter d 0' under the given resistance condition. Specific data are shown in tables 2 to 7:
table 2 copper core conductor resistance calculation parameters and empirical parameter values
。
TABLE 3 comparison of the copper core Primary Single wire diameter d 0 and the measured value of the stranded compacted conductor resistance R 20' with the standard specified maximum value R max
。
TABLE 4 accurate calculation of the selected Single wire diameter d 0 'and the measured value of the stranded compacted copper core conductor resistance R 20 "by means of the true k n' compared with the standard specified maximum value R max
。
Table 5 calculation parameters and empirical values for copper-clad aluminum conductor resistance
。
TABLE 6 comparison of the initially selected single wire diameter d 0 and the measured value of the resistance R 20' of the twisted compacted conductor with the standard specified maximum value R max of the copper-clad aluminum conductor
。
Table 7 shows that the actual measured value R 20 'of the resistance of the twisted compacted copper-clad aluminum conductor is compared with the standard specified maximum value R max by accurately calculating and selecting the single wire diameter d 0' by using the true k n
。
It should be noted that, for simplicity of description, the foregoing embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present application is not limited by the order of acts, as some steps may be performed in other orders or concurrently in accordance with the present application. Further, it should be understood by those skilled in the art that the embodiments described in the specification are preferred embodiments and that the actions involved are not necessarily required for the present application.
In the above embodiments, the basic principle and main features of the present invention and advantages of the present invention are described. It will be appreciated by persons skilled in the art that the present invention is not limited by the foregoing embodiments, but rather is shown and described in what is considered to be illustrative of the principles of the invention, and that modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the invention, and therefore, is within the scope of the appended claims.
Claims (9)
1. The method for precisely selecting the single wire diameter of the conductor before twisting and compacting under the given resistance condition is characterized by comprising the following steps:
S1: selecting experience parameters and conductor parameters, and calculating the single wire diameter of the conductor before primary twisting and compacting;
s2: detecting the conductor resistance of the twisted and compressed primary selected single wire, comparing the conductor resistance with a standard specified maximum value, confirming the diameter of the primary selected single wire as a process set value if the diameter is within a preset range, and performing step S3 if the diameter is not within the preset range;
S3: calculating the true value of the product of the empirical parameters of the stranded compacted conductor by adopting the measured value of the conductor resistance after the primary single wire stranding and compacting;
S4: and under the given conductor resistance condition, calculating the single wire diameter of the conductor before twisting and compacting by adopting the true value of the empirical parameter product of the twisted and compacted conductor.
2. The method of precisely selecting a diameter of a strand of a pre-compacted conductor for a given resistance according to claim 1, wherein the empirical parameter comprises k 1 、k2、k3、k4、k5, wherein,
K 1 represents an empirical value parameter greater than 1 introduced by an increase in resistivity caused during single wire processing in a conductor;
k 2 represents the single wire average twist in coefficient in the conductor;
k 3 represents an empirical value parameter greater than 1 introduced by the increase in resistivity caused by the compression and hardening of the conductor;
k 4 represents a cable core cabling twist coefficient;
k 5 represents an empirically derived parameter greater than 1 that is introduced by a single line tolerance.
3. The method for precisely selecting the diameter of the conductor single wire before twisting and compacting according to claim 2, wherein the conductor parameters include the conductor resistance R 20 at 20 ℃, the conductor resistivity ρ 20, the conductor unit length L of the cable and the number Z of the twisted and compacted conductor single wires.
4. A method of precisely selecting a diameter of a strand of a pre-twisted conductor for a given resistance as set forth in claim 3, wherein the diameter of the strand of the pre-twisted conductor is calculated according to the following calculation formula:
。
5. The method for precisely selecting a strand diameter for a pre-compacted conductor for a given resistance according to claim 4, wherein step S2 comprises the sub-steps of:
S21: the first selected single wires are made into stranded compressed conductors according to a specified number Z, and the resistance R 20' of the stranded compressed conductors is detected;
S22: and comparing the stranded compressed conductor resistance R 20' with a maximum value of a standard specified conductor resistance, judging whether the stranded compressed conductor resistance is in a preset range, and if so, selecting the primary single wire diameter d 0 as a process set value.
6. The method for precisely selecting a single wire diameter of a stranded compacted conductor for a given resistance according to claim 5, wherein the stranded compacted conductor comprises a copper core conductor, the measured copper core conductor resistance value is compared with a copper core conductor resistance standard specified maximum value R max, and if the measured copper core conductor resistance value is less than 1% of the copper core conductor resistance standard specified maximum value R max, the initially selected single wire diameter d 0 is selected as a process set value.
7. The method for precisely selecting a single wire diameter of a twisted compacted conductor for a given resistance according to claim 5, wherein the twisted compacted conductor comprises a copper-clad aluminum conductor, the measured resistance value of the copper-clad aluminum conductor is compared with a specified maximum resistance value R max 'of the copper-clad aluminum conductor, and if the measured resistance value of the copper-clad aluminum conductor is less than 1.5% of the specified maximum resistance value R max' of the copper-clad aluminum conductor, the diameter d 0 of the initially selected single wire is selected as a process set value.
8. The method for precisely selecting a single wire diameter of a twisted compacted conductor for a given resistance according to claim 5, wherein the method for calculating a true value of the product of empirical parameters of the twisted compacted conductor is as follows:
；
Where k n' is the true value of the empirical parameter product of stranded compacted conductor, k n, k n=k1 ×k2×k3×k4×k5.
9. The method for precisely selecting a diameter of a single wire of a conductor before twisting and compacting under a given resistance condition as set forth in claim 8, wherein said method for calculating the diameter of the single wire of the conductor before twisting and compacting by using a true value of the product of empirical parameters of the twisted and compacted conductor is as follows:
。
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