A method and system for estimating conductor length in transmission line construction

Abstract

The present invention provides a method for estimating the length of a conductor in the construction of a power transmission line, comprising: obtaining the position and height of each tower of the power transmission line by using a high-resolution optical satellite remote sensing image; calculating the length of the conductor between adjacent towers based on the position and height of each tower and taking into account the sag; calculating the length of the conductor actually required for the construction of the power transmission line based on the length of the conductor between all adjacent towers; providing objective and intuitive estimation results for investors and audit departments of power transmission line projects, avoiding possible deviations caused by manual field supervision estimation, improving the overall estimation efficiency of power transmission lines, and making the results more objective and intuitive; being conducive to improving the level of refined management of power transmission line projects, exploring new technical means for digital auditing, and improving the intelligent level of digital auditing.

Description

Technical Field

[0001] The invention belongs to the technical field of power transmission line theory, and relates to a method and system for estimating the length of a conductor in power transmission line construction. Background Art

[0002] With the advancement of the "new infrastructure" strategy, the construction scale of power transmission line projects represented by UHV continues to expand. During the construction of power transmission line projects, the project supervisor, investor and audit department must calculate the wire consumables used in the construction process.

[0003] At present, the estimation of conductor length is often reported by the project supervisor to the project investor and the auditing agency. The data is compared with the information provided by the designer to complete the acceptance. Digital information tools are rarely used. In this process, there are two problems: (1) The supervisor is more or less interfered by factors such as the construction party, resulting in human errors. (2) In the process of estimating the conductor length, an empirical coefficient is usually multiplied. This empirical coefficient is related to the terrain environment, but in actual operation, there is a lack of topographic information on the transmission line, and it is mainly determined by subjective measurements by experts. Summary of the invention

[0004] In view of the fact that the existing supervisor is more or less disturbed by factors such as the construction party, resulting in human errors and in the process of estimating the conductor length, an empirical coefficient is usually multiplied. The empirical coefficient is related to the terrain environment. However, in actual operation, there is a lack of topographic information of the transmission line, and the decision is mainly made by subjective measurement by experts. The present invention provides a method for estimating the conductor length of a transmission line, including:

[0005] Use high-resolution optical satellite remote sensing images to obtain the location and height of each tower of the transmission line;

[0006] Calculate the conductor length between adjacent towers based on the location and height of each tower and taking into account sag;

[0007] The actual conductor length required for constructing the transmission line is calculated based on the conductor lengths between all adjacent towers.

[0008] Preferably, the method of obtaining the position and height of each tower of the transmission line by using high-resolution optical satellite remote sensing images includes:

[0009] Using high-resolution optical satellite remote sensing images, the longitude and latitude of multiple visible tower legs of the transmission tower are obtained, and the horizontal span between the transmission towers and the transmission line are calculated using the multiple tower leg longitudes and latitudes, which are double-circuit three-phase AC lines;

[0010] The surface elevation of each transmission tower is obtained through the pre-acquired surface digital elevation model.

[0011] Preferably, the calculating of the conductor length between adjacent towers based on the position and height of each tower and taking into account the sag includes:

[0012] Based on the positions and ground elevations of the adjacent towers, an ideal required conductor length between adjacent towers is obtained after taking into account the absolute altitude difference;

[0013] Based on the ground elevation and the ideal required length of the conductor, and in combination with the sag between the adjacent towers, the actual required length of the conductor between the adjacent towers is obtained.

[0014] Preferably, obtaining the desired ideal conductor length between adjacent towers after considering the absolute altitude difference based on the positions and ground elevations of the adjacent towers includes:

[0015] Calculating the horizontal span introduced into the ground surface elevation based on the horizontal span, position and ground surface elevation of the adjacent transmission towers;

[0016] Based on the horizontal span introduced with the ground elevation and the number of transmission line splits, the ideal required conductor length between adjacent towers is calculated after considering the absolute elevation difference.

[0017] Preferably, the obtaining of the actual required length of the conductor between adjacent towers based on the ground elevation and the ideal required length of the conductor and in combination with the sag between adjacent towers comprises:

[0018] Based on the ground elevation of the towers, the midpoint sag of the horizontal span of the introduced height between the towers, and the horizontal distance of the lowest sag point in the span from the small-side tower, the height difference between the lowest sag point and the small-side tower is obtained;

[0019] Based on the height difference between the lowest sag point and the small-side tower, the horizontal span between the transmission towers and the ideal required length of the conductor, the actual required length of the conductor between the adjacent towers without taking into account the loss is obtained.

[0020] Preferably, the calculation formula for the height difference between the lowest sag point and the small side tower is as follows:

[0021]

[0022] In the formula, Δh i is the height difference between the lowest sag point of the line section between the ith tower and the i+1th tower and the ith tower, f 0 H is the midpoint sag of the span between absolute altitudes, i is the absolute altitude of the ith leg of the transmission tower, H i+1 is the absolute altitude of the i+1th leg of the transmission tower;

[0023] The calculation of the actual required length of the conductor between adjacent towers is as follows:

[0024]

[0025] Where D i Δh is the actual required length of the conductor between the ith tower and the i+1th tower of the satellite remote sensing transmission line without loss, i is the height difference between the lowest sag point and the i-th tower in the line section between the i-th tower and the i+1-th tower, Δh is the height difference between the lowest sag point and the small side tower, L i is the construction length of the line section corresponding to the horizontal span between the ith tower and the i+1th tower of the transmission line, L is P represents the horizontal distance of the lowest point arc corresponding to the line section between the ith tower and the i+1th tower of the transmission line from the ith base tower, i is the number of phases corresponding to the line section between the ith tower and the i+1th tower, N ci is the number of loops corresponding to the line section between the ith tower and the i+1th tower, N d is the number of transmission line splits.

[0026] Preferably, the calculating the actual required conductor length for constructing the transmission line based on the conductor lengths between all adjacent towers includes:

[0027] Based on the actual required length of the conductor between adjacent pole towers without loss, and considering the loss value in actual engineering construction, the actual construction application length of the conductor between adjacent pole towers with loss is obtained;

[0028] Based on the actual construction and application length of the conductors between adjacent poles and towers with recorded losses, the actual construction and application length of all adjacent poles and towers with recorded losses is calculated.

[0029] Preferably, the actual construction application length of all adjacent towers with loss is calculated as follows:

[0030]

[0031] Where D is the actual construction application length of all adjacent towers, n is the empirical coefficient of loss in actual engineering construction, and T is the total number of towers of the transmission line.

[0032] Preferably, the method further comprises:

[0033] Based on the horizontal span between the transmission towers, the transmission line conductor consumables without considering the sag and the height are calculated.

[0034] Preferably, the method further comprises:

[0035] Based on the absolute altitude and the total number of towers, the average elevation difference of the transmission line is calculated, and based on the average elevation difference of the transmission line, the elevation fluctuation degree of the transmission line channel is determined.

[0036] Based on the same concept, the present invention provides a transmission line construction conductor length estimation system, including: an acquisition module, a conductor length calculation module and an actual length calculation module;

[0037] The acquisition module is used to acquire the position and height of each tower of the transmission line using high-resolution optical satellite remote sensing images;

[0038] The conductor length calculation module is used to calculate the conductor length between adjacent towers based on the position and height of each tower and taking into account the sag;

[0039] The actual length calculation module is used to calculate the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. The present invention provides a method for estimating the length of a conductor in the construction of a transmission line, comprising: obtaining the position and height of each tower of the transmission line by using high-resolution optical satellite remote sensing images; calculating the length of the conductor between adjacent towers based on the position and height of each tower and taking into account the sag; calculating the length of the conductor actually required for the construction of the transmission line based on the length of the conductor between all adjacent towers; providing objective and intuitive estimation results for investors and audit departments of transmission line projects, avoiding possible deviations caused by manual field supervision estimation, improving the efficiency of global estimation of transmission lines, and making the results more objective and intuitive.

[0042] 2. The present invention provides a method and system for estimating the length of conductors in transmission line construction, which is conducive to improving the level of refined management of transmission line projects, exploring new technical means for digital auditing, and improving the intelligence level of digital auditing. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A flow chart of a method for estimating the length of a conductor in power transmission line construction provided by the present invention;

[0044] Figure 2 Satellite remote sensing image provided by the embodiment of the present invention;

[0045] Figure 3 A top view of a satellite remote sensing power transmission line provided by an embodiment of the present invention;

[0046] Figure 4 A simplified side view of a power transmission line provided by the present invention;

[0047] Figure 5 An example diagram of the distance calculation results between adjacent towers in a typical section of a certain line provided by the present invention;

[0048] Figure 6 An example diagram of the estimated length of power transmission wire consumables of a certain line provided by the present invention;

[0049] Figure 7 This is a structural diagram of the transmission line construction conductor length estimation system provided by the present invention. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] At present, point-to-point distance measurement on maps based on satellite remote sensing is quite mature. However, for the estimation of transmission tower conductor length, existing research needs to further consider the following three issues:

[0053] (1) Different transmission towers have different altitudes. The wire length estimation cannot be limited to a two-dimensional plane. The three-dimensional scenarios of longitude, latitude and altitude must be considered.

[0054] (2) There is sag in the transmission line conductor, which is not the straight diagonal distance between two adjacent transmission towers.

[0055] (3) How to provide appropriate auxiliary information for experts to determine the empirical coefficient. The empirical coefficient is mainly related to the terrain.

[0056] In view of this, the purpose of the present invention is to use satellite remote sensing technology to solve the above three problems, improve the level of refined management of transmission line projects, explore new technical means for digital auditing of State Grid Corporation of China, and improve the intelligence level of digital auditing.

[0057] The present invention provides a method for estimating the length of a transmission line conductor, which uses high-resolution optical satellite remote sensing images, takes into account the longitude and latitude, three-dimensional scenes of altitude and terrain, and estimates the length of a transmission line conductor taking into account sag. Figure 1 The method provided by the present invention is introduced in the flowchart, and the specific steps are as follows:

[0058] Step 1: Use high-resolution optical satellite remote sensing images to obtain the location and height of each tower of the transmission line;

[0059] Step 2: Calculate the conductor length between adjacent towers based on the location and height of each tower and taking into account the sag;

[0060] Step 3: Calculating the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers;

[0061] Step 1: Use high-resolution optical satellite remote sensing images to obtain the location and height of each tower of the transmission line, including:

[0062] (I) Estimation of the length of satellite remote sensing transmission line construction

[0063] For any transmission line project, the engineering designer has given the design length of the line. However, in the actual construction of the transmission line project, due to factors such as temporary modification of the transmission tower point, the construction length may be inconsistent with the design length. Therefore, the project supervisor or auditor has a certain demand for a third-party estimate of the actual construction length of the transmission line. This patent's transmission line construction length estimation method based on satellite remote sensing images is as follows, combined with Figure 2 The satellite remote sensing images are introduced.

[0064] (1) First, extract each transmission tower and determine the longitude and latitude and position of the four legs of each transmission tower (x j ,y j )(j=1,2,3,4), such as Figure 2 shown.

[0065] (2) Satellite remote sensing images are taken at different angles, and the positions of the four tower legs cannot be fully seen. Therefore, it is necessary to manually select the longitude and latitude of the tower legs that can be seen by the transmission line (x j ,y j ), but the coordinates of the two tower legs at opposite corners must be selected.

[0066] For example: Figure 2 In (x 1 ,y 1 ) and (x 4 ,y 4 ) The two tower legs are disturbed by the insulator string and other front objects, (x 2 ,y 2 ) and (x 3 ,y 3 ) The tower leg position is more intuitive. You can manually select (x 1 ,y 1 ) and (x 3 ,y 3 ) as a group, or (x 2 ,y 2 ) and (x 4 ,y 4 ) is a set of reference points for estimating the length of transmission line construction.

[0067] In this way, the coordinates of the center point of the bottom surface of each transmission tower can be calculated as:

[0068] X=(x 1 +x 3 ) / 2 or x=(x2 +x 4 ) / 2

[0069] Y=(y 1 +y 3 ) / 2 or y=(y 2 +y 4 ) / 2

[0070] (3) In step (2), the coordinates of the center point of the bottom surface of each transmission tower (X i , Y i )(i represents the i-th transmission tower), the horizontal spacing between two adjacent transmission towers is calculated as:

[0071] L i =[(X i+1 -X i ) 2 +(Y i+1 -Y i ) 2 ] 1 / 2

[0072] L i Represents the horizontal distance between the i-th tower and the i+1-th tower.

[0073] (4) Total construction length of transmission lines:

[0074]

[0075] Where T is the total number of towers of the transmission line.

[0076] Step 2: Calculate the conductor length between adjacent towers based on the location and height of each tower and taking into account the sag, including:

[0077] 4.2 Estimation of satellite remote sensing wire consumables for transmission lines considering sag

[0078] Based on the automatic extraction results of transmission towers from satellite remote sensing (transmission tower identification results. Based on the identification results, the tower foot position coordinates are manually marked), the automatic positioning of transmission towers on satellite remote sensing images and the tower base statistics T are realized, and the horizontal span L between two adjacent towers is calculated. At the same time, based on optical satellite remote sensing images, the number of phases P (two-phase (DC) or three-phase (AC)) and the number of loops N of the transmission line can be determined. c .

[0079] from Figure 3Look at the top view of the transmission line on the satellite remote sensing image. For two adjacent transmission towers, we can first calculate the horizontal span L between them. For the line in the figure, we can find that it is an AC line (three-phase), that is, the number of phases P is 3. At the same time, we can determine that this section of the transmission line is a double circuit, that is, the number of circuits N c is 2. Similarly, Figure 2 The number of phases of the transmission line is P = 3, and the number of loops is N c =2.

[0080] In this way, under ideal conditions, that is, assuming that adjacent transmission towers are in the same horizontal plane, ignoring sag and tower height differences, the calculation formula for conductor consumables between adjacent towers of the transmission line is:

[0081] D i =L i ×P i ×N ci ×N d

[0082] Among them, N ci is the number of loops corresponding to the line section between the ith tower and the i+1th tower, P i is the number of phases corresponding to the line section between the ith tower and the i+1th tower. i represents the line section between the ith tower and the i+1th tower of the transmission line. N d is the number of transmission line splits, which can be obtained from the transmission line engineering design unit.

[0083] Step 3: Calculate the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers, specifically including:

[0084] In order to consider the real geographical environment, the elevation difference is introduced. By extracting the surface digital elevation model DSM, the surface elevation H corresponding to each tower can be known. i .from Figure 4 Let's assume that the absolute altitudes of the ith tower and the i+1th tower are H i and H i+1 , then the height difference between the two is H i+1 -H i In this way, the conductor consumables between adjacent towers can be calculated as:

[0085]

[0086] D i =L′ i ×P i ×N ci ×N d

[0087] L iIt represents the horizontal span corresponding to the line section between the ith tower and the i+1th tower of the transmission line.

[0088] The above formula does not take into account the sag and the loss in actual engineering construction. In order to take into account the sag and reduce the dependence on design parameters as much as possible, the length of the arc conductor is simplified to the sum of two continuous dashed line segments, as shown in the following example: Figure 4 As shown in . In this way, only two parameters of transmission line design need to be combined, namely the midpoint sag f of each span 0 , and the horizontal distance L between the lowest point of the arc in each span and the small side tower s .

[0089] The height difference between the lowest sag point and the small side tower can be calculated as:

[0090]

[0091]

[0092] Where Δh i It refers to: the height difference between the lowest sag point corresponding to the line section between the i-th tower and the i+1-th tower and the i-th tower; i represents the line section corresponding to the i-th tower and the i+1-th tower of the transmission line.

[0093] L i It represents the horizontal span of the transmission line section between the ith tower and the i+1th tower, L is It represents the horizontal distance of the lowest point arc corresponding to the line section between the ith tower and the i+1th tower of the transmission line from the ith base tower.

[0094] Finally, considering the losses in actual engineering construction and multiplying by the empirical coefficient n, the final estimation formula for satellite remote sensing transmission line conductor consumables is obtained:

[0095]

[0096] Where n represents the empirical coefficient, which is determined based on expert experience.

[0097] Since this patent obtains the three-dimensional terrain of the transmission line channel (including the relative altitude of each tower) through satellite remote sensing methods, and the empirical coefficient n is related to the complexity of the terrain, this patent proposes the following indicators to assist experts in determining the value of the empirical coefficient n.

[0098] First, the average elevation difference of the transmission line is calculated based on DSM.

[0099]

[0100] It can be used as an indicator to measure the elevation fluctuation of the transmission line channel. The larger it is, the more dramatic the fluctuation in the altitude of the transmission line channel is, tending towards mountainous areas, and the corresponding n value should be larger. The smaller it is, the gentler the elevation fluctuation of the transmission line channel is, tending towards a plain, and the corresponding n value should be smaller.

[0101] Taking a line of State Grid Corporation of China as an example, historical optical satellite remote sensing images are obtained, and the construction length of the transmission line and the length of the conductor consumables are estimated using the method proposed in this paper. Figure 5-Figure 6 shown.

[0102] This patent uses high-resolution optical satellite remote sensing images to estimate the construction length of transmission lines and the length of transmission line conductors taking into account sag, providing third-party objective and intuitive estimation results for transmission line project investors and audit departments, avoiding possible deviations caused by manual field supervision estimation, improving the efficiency of global transmission line estimation, and making the results more objective and intuitive. It is conducive to improving the level of refined management of transmission line projects, exploring new technical means for digital auditing of State Grid Corporation of China, and improving the intelligent level of digital auditing.

[0103] Embodiment 2:

[0104] Based on the same concept, the present invention provides a transmission line construction conductor length estimation system, combined with Figure 7 The system structure diagram is introduced, including: acquisition module, wire length calculation module and actual length calculation module;

[0105] The acquisition module is used to acquire the position and height of each tower of the transmission line using high-resolution optical satellite remote sensing images;

[0106] The conductor length calculation module is used to calculate the conductor length between adjacent towers based on the position and height of each tower and taking into account the sag;

[0107] The actual length calculation module is used to calculate the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers.

[0108] The acquisition module includes: a remote sensing image submodule and a surface elevation submodule;

[0109] The remote sensing image submodule is used to obtain the longitude and latitude of multiple visible tower legs of the transmission tower using high-resolution optical satellite remote sensing images, and the horizontal span between the transmission towers and the transmission line are calculated using the longitude and latitude of the multiple tower legs to obtain a double-circuit three-phase AC line;

[0110] The surface elevation submodule is used to obtain the surface elevation of each transmission tower through a pre-acquired surface digital elevation model.

[0111] The wire length calculation module includes: an ideal length submodule and a demand submodule;

[0112] The ideal length submodule is used to obtain the ideal required conductor length between adjacent towers after considering the absolute altitude difference based on the positions and ground elevations of the adjacent towers;

[0113] The demand submodule is used to obtain the actual required length of the conductor between the adjacent towers based on the ground elevation and the ideal required length of the conductor, combined with the sag between the adjacent towers.

[0114] The ideal length submodule includes: a gear spacing calculation unit and a difference consideration calculation unit;

[0115] The span calculation unit is used to calculate the horizontal span introduced into the ground surface elevation based on the horizontal span, position and ground surface elevation of the adjacent transmission towers;

[0116] The difference-taking-into-calculation unit is used to calculate the ideal required conductor length between adjacent towers after taking into account the absolute altitude difference based on the horizontal span introduced into the ground surface elevation and the number of transmission line splits.

[0117] The demand submodule includes: a height difference unit and a demand wire calculation unit;

[0118] The height difference unit is used to obtain the height difference between the lowest sag point and the small side tower based on the ground elevation of the tower, the midpoint sag of the horizontal span of the introduction height between the towers, and the horizontal distance of the lowest sag point in the span from the small side tower;

[0119] The required conductor calculation unit is used to obtain the actual required length of the conductor between the adjacent towers without taking into account the loss based on the height difference between the lowest sag point and the small-side tower, the horizontal span between the transmission towers and the ideal required conductor length.

[0120] The actual length calculation module includes: a loss calculation submodule and all loss calculation submodules;

[0121] The loss calculation submodule is used to obtain the actual construction application length of the conductor between adjacent towers with loss accounted based on the actual required length of the conductor between adjacent towers without loss accounted and taking into account the loss value in actual engineering construction;

[0122] The all-loss calculation submodule is used to calculate the actual construction and application lengths of all adjacent pole towers with recorded losses based on the actual construction and application lengths of the conductors between adjacent pole towers with recorded losses.

[0123] The system further includes: a sag calculation module and an undulation calculation module not considering the sag;

[0124] The sag-not-considered calculation module calculates the transmission line conductor consumables without considering the sag and height based on the horizontal span between the transmission towers;

[0125] The fluctuation degree calculation module calculates the average elevation difference of the transmission line based on the absolute altitude and the total number of towers, and determines the elevation fluctuation degree of the transmission line channel based on the average elevation difference of the transmission line.

[0126] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0130] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A method for estimating the length of a conductor in a transmission line construction, characterized in that: include: Use high-resolution optical satellite remote sensing images to obtain the location and height of each tower of the transmission line; Calculate the conductor length between adjacent towers based on the location and height of each tower and taking into account sag; Calculating the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers; The method of obtaining the position and height of each tower of the transmission line by using high-resolution optical satellite remote sensing images includes: Using high-resolution optical satellite remote sensing images, the longitude and latitude of multiple visible tower legs of the transmission tower are obtained, and the horizontal span between the transmission towers and the transmission line are calculated using the multiple tower leg longitudes and latitudes, which are double-circuit three-phase AC lines; The surface elevation of each transmission tower is obtained by using a pre-acquired surface digital elevation model; The calculation of the conductor length between adjacent towers based on the position and height of each tower and taking into account the sag includes: Based on the positions and ground elevations of the adjacent towers, an ideal required conductor length between adjacent towers is obtained after taking into account the absolute altitude difference; Based on the ground elevation and the ideal required length of the conductor, and in combination with the sag between the adjacent towers, the actual required length of the conductor between the adjacent towers is obtained; The step of obtaining the desired ideal conductor length between adjacent towers after considering the absolute altitude difference based on the positions and ground elevations of the adjacent towers includes: Calculating the horizontal span introduced into the ground surface elevation based on the horizontal span, position and ground surface elevation of the adjacent transmission towers; Based on the horizontal span introduced with the ground elevation and the number of transmission line splits, the ideal required conductor length between adjacent towers is calculated after considering the absolute elevation difference.

2. The method according to claim 1, characterized in that The actual required length of the conductor between adjacent towers is obtained based on the ground elevation and the ideal required length of the conductor, and in combination with the sag between adjacent towers, including: Based on the ground elevation of the towers, the midpoint sag of the horizontal span of the introduced height between the towers, and the horizontal distance of the lowest sag point in the span from the small-side tower, the height difference between the lowest sag point and the small-side tower is obtained; Based on the height difference between the lowest sag point and the small-side tower, the horizontal span between the transmission towers and the ideal required length of the conductor, the actual required length of the conductor between the adjacent towers without taking into account the loss is obtained.

3. The method according to claim 2, characterized in that The calculation formula for the height difference between the lowest sag point and the small side tower is as follows: In the formula, For the i Base tower and i The height difference between the lowest sag point of the line section between +1 towers and the i-th tower, is the midpoint sag of the span between absolute altitudes, is the absolute altitude of the transmission tower leg, is the absolute altitude of the th tower leg of the transmission tower; The calculation of the actual required length of the conductor between adjacent towers is as follows: In the formula, Satellite remote sensing transmission line without loss i The tower and i +1 Actual required length of conductor between towers, For the i Base tower and i The height difference between the lowest sag point of the line section between +1 towers and the i-th tower, is the height difference between the lowest sag point and the small side tower, For the transmission line i The tower and i +1 The length of the line section corresponding to the horizontal span between towers, Indicates the transmission line i The tower and i +1 The horizontal distance of the lowest point arc corresponding to the line section between towers from the i-th base tower, For the i The tower and i +1 The number of phases corresponding to the line section between towers, For the i The tower and i +1 The number of loops corresponding to the line section between towers, is the number of transmission line splits.

4. The method according to claim 3, characterized in that The calculating the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers includes: Based on the actual required length of the conductor between adjacent pole towers without loss, and considering the loss value in actual engineering construction, the actual construction application length of the conductor between adjacent pole towers with loss is obtained; Based on the actual construction and application length of the conductors between adjacent poles and towers with recorded losses, the actual construction and application length of all adjacent poles and towers with recorded losses is calculated.

5. The method according to claim 4, characterized in that The actual construction application length of all adjacent towers with loss is calculated as follows: Where D is the actual construction and application length of all adjacent towers with loss. n is the empirical loss coefficient value in actual engineering construction, T is the total number of towers of the transmission line.

6. The method according to claim 1, characterized in that Also includes: Based on the horizontal span between the transmission towers, the transmission line conductor consumables without considering the sag and the height are calculated.

7. The method according to claim 5, characterized in that Also includes: Based on the absolute altitude and the total number of towers, the average elevation difference of the transmission line is calculated, and based on the average elevation difference of the transmission line, the elevation fluctuation degree of the transmission line channel is determined.

8. A transmission line construction conductor length estimation system for implementing the method according to any one of claims 1 to 7, characterized in that: include: Acquisition module, wire length calculation module and actual length calculation module; The acquisition module is used to acquire the position and height of each tower of the transmission line using high-resolution optical satellite remote sensing images; The conductor length calculation module is used to calculate the conductor length between adjacent towers based on the position and height of each tower and taking into account the sag; The actual length calculation module is used to calculate the actual conductor length required for constructing the transmission line based on the conductor lengths between all adjacent towers.

Images