A method and device for sag detection of transmission lines

Abstract

The present application provides a method and device for sag detection of a transmission line, and the present application belongs to the technical field of transmission lines. The method obtains the inclination angle information of the transmission line collected by the inclination angle sensing device and the wind speed information collected by the wind speed sensing device. Based on the wind speed information, it is determined whether the inclination angle information is the inclination angle information to be compensated. Among them, the wind speed corresponding to the inclination angle information to be compensated is greater than a preset threshold. When it is determined that the inclination angle information is the inclination angle information to be compensated, a compensation coefficient corresponding to the wind speed information is determined, and through a preset algorithm and the compensation coefficient, a compensation inclination angle value corresponding to the inclination angle information to be compensated is determined. Based on the compensation inclination angle value and the tower information of the current transmission line, the sag value of the current transmission line is determined, so that the supervision terminal determines the sag state information according to the sag value. Through the above solution, the sag of the transmission line is accurately detected, ensuring the safe and stable operation of the transmission line.

Description

Technical Field

[0001] This application relates to the technical field of transmission lines, and particularly to a method and device for sag detection of transmission lines. Background Art

[0002] Transmission lines are important energy arteries for the development of modern society. Structurally, transmission lines are divided into overhead transmission lines and cable lines. Among them, overhead transmission lines, as the current main power transmission carriers, ensuring their safe and stable operation is the top priority of the daily work of transmission line maintenance personnel.

[0003] The sag of transmission lines, as an important indicator of line safety operation, will be affected by the properties of the line sag in scenarios such as heavy snow, strong wind, or icing. If the sag state of the line cannot be accurately monitored, safety accidents are likely to occur. Currently, the sag monitoring of transmission lines mainly relies on manual or video monitoring methods. Manual sag detection has hysteresis, and in harsh environments, it is not easy for monitoring personnel to perform safe and accurate sag detection; while video monitoring relies on devices such as cameras. Such devices are easily affected by the external environment or damaged by external forces, and the camera cannot guarantee the accuracy of the detected sag value.

[0004] Based on this, there is an urgent need for a technical solution that can accurately detect the sag of transmission lines and ensure the safe and stable operation of transmission lines. Summary of the Invention

[0005] The embodiments of this application provide a method and device for sag detection of transmission lines, which are used to accurately detect the sag of transmission lines and ensure the safe and stable operation of transmission lines.

[0006] On the one hand, the embodiments of this application provide a method for sag detection of transmission lines. The method includes:

[0007] Obtain the inclination angle information of the transmission line collected by the inclination angle sensing device and the wind speed information collected by the wind speed sensing device. Based on the wind speed information, determine whether the inclination angle information is the inclination angle information to be compensated. Among them, the wind speed corresponding to the inclination angle information to be compensated is greater than the preset threshold. If so, determine the compensation coefficient corresponding to the wind speed information, and through the preset algorithm and the compensation coefficient, determine the compensation inclination angle value corresponding to the inclination angle information to be compensated. Based on the compensation inclination angle value and the tower information of the current transmission line, determine the sag value of the current transmission line, so that the supervision terminal can determine the sag state information according to the sag value.

[0008] In an implementation of the present application, when it is determined that the inclination angle information is not the inclination angle information to be compensated, the inclination angle value corresponding to the inclination angle information is determined. Based on the inclination angle value, the tower information of the current transmission line, and the preset sag formula, the sag value of the current transmission line is determined, so that the supervision terminal determines the sag state information according to the sag value. Wherein, the tower information at least includes: the height difference between the two towers corresponding to the sag, and the span between the two towers corresponding to the sag.

[0009] In an implementation of the present application, the wind speed value corresponding to the wind speed information within the first preset time is determined. The wind speed value is matched with the preset coefficient look-up table to determine the compensation coefficient corresponding to the wind speed value according to the matching result.

[0010] In an implementation of the present application, a number of inclination angle information samples are obtained. The inclination angle information sample includes a number of inclination angle information sequences corresponding to a number of different wind speed values. The inclination angle information sequence includes a plurality of included angle values between the cable direction and the preset direction at the suspension point of the transmission line collected at preset time intervals within the second preset time. The maximum value of the included angle values in each inclination angle information sequence corresponding to the same wind speed value is determined, and the time value within the second preset time corresponding to each maximum value is determined. According to the time value corresponding to each maximum value and the number of time values, the inclination angle noise frequency of the corresponding wind speed value is determined. Based on each inclination angle noise frequency and the preset time interval, the low-pass filter coefficient corresponding to each inclination angle noise frequency is determined, and the low-pass filter coefficient and the corresponding wind speed value are stored in the preset coefficient look-up table.

[0011] In an implementation of the present application, the tangent value of the inclination angle is determined according to the compensated inclination angle value or the inclination angle value. According to the tangent value of the inclination angle, the tower information, and the preset sag formula, the sag value of the current transmission line is determined.

[0012] In an implementation of the present application, the compensation coefficient is input into the preset algorithm to determine the corresponding first-order low-pass filter. The inclination angle information to be compensated is input into the first-order low-pass filter to calculate the compensated inclination angle value.

[0013] In an implementation of the present application, when there is a height difference between the two towers corresponding to the sag of the current transmission line, the inclination angle sensor is arranged at the wire hanging end of the first tower among the two towers. Wherein, the absolute height of the first tower is higher than the absolute height of the other tower among the two towers.

[0014] In an implementation of the present application, the span between the two towers is greater than the height difference.

[0015] In an implementation of the present application, the current transmission line is an All Dielectric Self-Supporting (ADSS) optical cable.

[0016] On the other hand, an embodiment of the present application further provides a sag detection device for a transmission line, and the device includes:

[0017] At least one processor; and a memory communicatively connected to the at least one processor. Wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:

[0018] Obtain the inclination angle information of the transmission line collected by the inclination angle sensing device and the wind speed information collected by the wind speed sensing device. Based on the wind speed information, determine whether the inclination angle information is inclination angle information to be compensated. Wherein, the wind speed corresponding to the inclination angle information to be compensated is greater than a preset threshold. If so, determine the compensation coefficient corresponding to the wind speed information, and determine the compensation inclination angle value corresponding to the inclination angle information to be compensated through a preset algorithm and the compensation coefficient. Based on the compensation inclination angle value and the pole tower information of the current transmission line, determine the sag value of the current transmission line, so that the supervision terminal determines the sag state information according to the sag value.

[0019] Through the above solution, the present application uses the inclination angle sensing device and the wind speed sensing device to respectively collect the inclination angle and the wind speed, and determines whether the sag of the current transmission line needs to be processed for the compensation inclination angle value. If the inclination angle compensation is required, the compensation inclination angle value is obtained through the compensation coefficient and the preset algorithm, and then the sag value is calculated. Thereby, the influence of the wind speed on the sag detection is avoided, the accurate detection of the sag of the transmission line is ensured, and the safe and stable operation of the transmission line is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0021] Figure 1 It is a schematic flow chart of a sag detection method for a transmission line in an embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of a transmission line in a sag detection method for a transmission line in an embodiment of the present application;

[0023] Figure 3 It is a schematic diagram in a sag detection method for a transmission line in an embodiment of the present application;

[0024] Figure 4 It is another schematic diagram in a sag detection method for a transmission line in an embodiment of the present application;

[0025] Figure 5 It is a schematic structural diagram of a sag detection device for a transmission line in an embodiment of the present application. Specific Embodiments

[0026] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0027] Currently, for the sag measurement of transmission lines, under the influence of adverse weather such as wind or heavy snow, the sag properties of transmission lines are easily affected, and the sag measurement is not accurate. The inaccurate sag detection result cannot accurately judge the safety status of the transmission line, and it is very easy to threaten the lives of passing pedestrians beside the transmission line.

[0028] Based on this, the embodiments of the present application provide a sag detection method and device for transmission lines to accurately detect the sag of transmission lines and ensure the safe and stable operation of transmission lines.

[0029] The following will describe in detail each embodiment of the present application with reference to the drawings.

[0030] The embodiments of the present application provide a sag detection method for transmission lines. The execution subject of the sag detection method can be a single-chip microcomputer (microcontroller). The single-chip microcomputer is connected to an inclination sensing device and a wind speed sensing device through a serial port. The sag detection method for transmission lines in the present application is as Figure 1 shown. The method may include steps S101-S106:

[0031] S101, the microcontroller obtains the transmission line inclination information collected by the inclination sensing device and the wind speed information collected by the wind speed sensing device.

[0032] In the embodiments of the present application, the schematic diagram of the transmission line is as Figure 2 shown. When there is a height difference between the two towers corresponding to the sag of the current transmission line (A and B are the wire hanging ends of the two towers respectively), the inclination sensor is set at the wire hanging end of the first tower among the two towers. Among them, the absolute height of the first tower is higher than the absolute height of the other tower among the two towers. In addition, the span between the two towers is greater than the height difference between the two towers.

[0033] That is to say, the two towers corresponding to A and B may not be of the same height. In the schematic diagram, H is the height difference between the two towers, L is the span, θB is the inclination of the transmission line, and f is the sag value.

[0034] The above-mentioned current transmission line can be an All Dielectric Self-Supporting (ADSS) optical cable.

[0035] S102. The microcontroller determines whether the inclination information is the inclination information to be compensated based on the wind speed information.

[0036] Among them, the wind speed corresponding to the inclination information to be compensated is greater than the preset threshold.

[0037] In the embodiment of the present application, the wind speed information is collected by a wind speed sensing device. The microcontroller can open a timer with a first preset duration, such as a 10-millisecond timer. During this timer, the microcontroller interrupts and continuously samples the inclination information collected by the inclination sensing device through the serial port, such as continuously sampling 10 times. Then, the microcontroller reads the wind speed information collected by the wind speed sensing device through the serial port. This wind speed information can be the average value of the wind speed values within a second preset duration, such as the average value of the wind speed values continuously collected by the wind speed sensing device within 5 seconds.

[0038] In the actual sag detection process, the preset threshold can be set by itself. This preset threshold is the wind speed value that affects the accuracy of sag detection. Specifically, when the wind speed value is greater than this preset threshold, the first accuracy of sag detection is lower than the second accuracy when there is no wind and it is stationary, or the difference between the second accuracy when there is no wind and it is stationary and the first accuracy is greater than the preset value; when the wind speed value is less than this preset threshold, the first accuracy of sag detection is equal to the second accuracy when there is no wind and it is stationary, or the difference between the second accuracy when there is no wind and it is stationary and the first accuracy is less than the preset value. In the embodiment of the present application, the inclination information collected when the wind speed value is greater than the preset threshold is used as the inclination information to be compensated, and the present application performs denoising processing on this inclination information to be compensated.

[0039] S103. When the microcontroller determines that the inclination information is the inclination information to be compensated, it determines the compensation coefficient corresponding to the wind speed information, and determines the compensated inclination angle value corresponding to the inclination information to be compensated through a preset algorithm and the compensation coefficient.

[0040] In the embodiment of the present application, the microcontroller determines the compensation coefficient corresponding to the wind speed information, specifically including:

[0041] First, the microcontroller determines the wind speed value corresponding to the wind speed information within the first preset time.

[0042] The first preset time can be set by the user according to the actual usage scenario. The wind speed value within the first preset time can be the average value of the continuous wind speed values within this first preset time.

[0043] Then, the microcontroller matches the wind speed value with the preset coefficient comparison table to determine the compensation coefficient corresponding to the wind speed value according to the matching result.

[0044] Among them, the preset coefficient comparison table is obtained in the following manner. The execution entity for obtaining the preset coefficient comparison table can be other servers or a microcontroller. This application does not make specific limitations in this regard. Taking the microcontroller as the execution entity as an example, it is as follows:

[0045] First, the microcontroller obtains a number of tilt information samples.

[0046] The tilt information samples include a number of tilt information sequences corresponding to a number of different wind speed values. The tilt information sequence includes multiple included angle values between the cable direction and the preset direction at the suspension point of the transmission line collected at preset time intervals within the second preset time.

[0047] Different wind speed values such as: 0.5 m / s, 1 m / s, 1.5 m / s, 2 m / s..., each wind speed value corresponds to a number of tilt information sequences, and the sequences are arranged in chronological order, such as [30 degrees, 40 degrees, 45 degrees...]. The preset direction is the horizontal direction on the same plane of the cable, such as Figure 2 where θB is the included angle value. The second preset time is greater than the preset time interval. For example, if the preset time interval is 10 milliseconds and the second preset time is 500 milliseconds, one tilt information sequence can include 50 included angle values.

[0048] Secondly, the microcontroller determines the maximum value of the included angle values in each tilt information sequence corresponding to the same wind speed value, and determines the time value within the second preset time corresponding to each maximum value.

[0049] That is to say, in the above tilt information sequence, determine the maximum angle value in the sequence, and then determine the time value of the second preset time corresponding to the maximum angle value. For example, [30 degrees, 40 degrees, 45 degrees...], if 50 degrees is the maximum angle value in the tilt information sequence, and the time value of the second preset time corresponding to the maximum angle value is between 100 milliseconds and 110 milliseconds, the second preset time is from 0 milliseconds to 500 milliseconds, and this time value is the 11th time value.

[0050] Then, the microcontroller determines the tilt noise frequency of the corresponding wind speed value according to the time value corresponding to each maximum value and the number of time values.

[0051] Specifically, the microcontroller determines the sorting of the time values corresponding to each maximum value in the second preset time. For example, if the time value corresponding to the maximum wind speed value of a wind speed value is the 11th time value in the above 100 milliseconds - 110 milliseconds, then the noise frequency corresponding to this wind speed value is q1 = 1 / T1, where T1 = 11. The number of time values is the same as the number of the inclination information sequences of the selected wind speed value. For example, the number of inclination information sequences of the wind speed value x is n, then the inclination noise frequency of this wind speed value obtained is q = (q1 + q2 +... + qn) / n.

[0052] Finally, the microcontroller determines the low-pass filter coefficients corresponding to each inclination noise frequency based on each inclination noise frequency and the preset time interval, and stores the low-pass filter coefficients and the corresponding wind speed values in the preset coefficient look-up table.

[0053] Specifically, the microcontroller can use the Filter Design & Analysis Tool (FDAtool) of MATLAB software to calculate the above low-pass filter coefficients. In the actual use process, the set order is 1. An example of calculating the low-pass filter coefficients is as follows: in the above process, the sampling frequency is 100 Hz and the inclination noise frequency is q, and the low-pass filter coefficients are calculated through FDAtool. Through the above solution, the microcontroller can obtain the low-pass filter coefficients corresponding to different wind speed values, so as to establish a preset coefficient look-up table of low-pass filter coefficients corresponding to different wind speed values.

[0054] In addition, the above preset algorithm can obtain a first-order low-pass filter: Y(n) = aX(n) + (1 - a)Y(n - 1); where a is the low-pass filter coefficient in the preset coefficient look-up table, X(n) is the inclination information to be compensated for the current sampling, Y(n - 1) is the compensated inclination angle value of the previous filter output, and Y(n) is the compensated inclination angle value after the current filter, that is, θB. The microcontroller inputs the compensation coefficient into the preset algorithm to determine the corresponding first-order low-pass filter, and then inputs the inclination information to be compensated into the first-order low-pass filter to calculate the compensated inclination angle value.

[0055] The above solution can regard the inclination information at different wind speeds as noise, and this noise is caused by the wind speed. Through the preset coefficient look-up table obtained above, the noise caused by the wind speed can be processed, and the problem of inaccurate sag detection caused by wind speed noise can be avoided, improving the accuracy of sag detection.

[0056] S104. The microcontroller determines the sag value of the current transmission line based on the compensated inclination angle value and the tower information of the current transmission line, so that the supervision terminal determines the sag state information according to the sag value.

[0057] The microcontroller determines the sag value of the current transmission line, specifically including:

[0058] First, the microcontroller determines the tangent value of the inclination angle according to the compensated inclination angle value or the inclination angle value.

[0059] Next, the microcontroller determines the sag value of the current transmission line according to the tangent value of the inclination angle, the tower information, and the preset sag formula.

[0060] The microcontroller inputs the compensated inclination angle value and the tower information into the preset sag formula: f = L / 4 * (tanθB - H / L), and then the sag value of the current transmission line can be determined.

[0061] S105. When the microcontroller determines that the inclination information is not the inclination information to be compensated, it determines the inclination angle value corresponding to the inclination information.

[0062] Specifically, when the wind speed is less than the preset threshold, the microcontroller can calculate the average value of the inclination angle values in the inclination information collected by the inclination sensing device during this time period as the inclination angle value.

[0063] S106. The microcontroller determines the sag value of the current transmission line based on the inclination angle value, the tower information of the current transmission line, and the preset sag formula, so that the supervision terminal can determine the sag state information according to the sag value.

[0064] Among them, the tower information at least includes: the height difference between the two towers corresponding to the sag, and the span between the two towers corresponding to the sag.

[0065] The microcontroller inputs the inclination angle value, the height difference H between the two towers, and the span between the two towers into the above preset sag formula: f = L / 4 * (tanθB - H / L), and then the sag value can be determined.

[0066] In an embodiment of the present application, in steps S104 and S106, the microcontroller can send the sag value to the supervision terminal, and the supervision terminal can be devices such as the mobile phone or computer of the transmission line supervisor. The present application does not make specific limitations on this. The supervision terminal can analyze whether the sag value is greater than the preset sag value. If it is greater than the preset sag value, an alarm message will be sent, such as text, sound, or a light signal. The preset sag value is set during actual use, and the preset sag value may vary for different regions and different transmission lines. The present application does not make specific limitations on this.

[0067] Through the above solution, the present application uses an inclination sensing device and a wind speed sensing device to collect the inclination and wind speed respectively, and determines whether the sag of the current transmission line needs to be processed by compensating the inclination angle value. If inclination compensation is required, the compensated inclination angle value is obtained through a compensation coefficient and a preset algorithm, and then the sag value is calculated. Thereby, the influence of wind speed on sag detection is avoided, accurate detection of the sag of the transmission line is ensured, and the safe and stable operation of the transmission line is guaranteed.

[0068] Through the above solution, the present application performs sag detection, improving the accuracy of sag detection of the transmission line. As Figure 3 , Figure 4 shown, Figure 3 is the sag change table when there is wind speed and no compensation is performed, Figure 4 and is the sag change table when there is wind speed and the above compensation is performed. Figure 4 Compared with the sag change table of Figure 3 , the sag change table after compensation greatly improves the accuracy of sag detection.

[0069] Figure 5 FIG. is a schematic structural diagram of a sag detection device for a transmission line provided by an embodiment of the present application. The device includes:

[0070] At least one processor; and a memory communicatively connected to the at least one processor. Wherein, the memory stores instructions executable by the at least one processor. The instructions are executed by the at least one processor to enable the at least one processor to:

[0071] Obtain the inclination information of the transmission line collected by the inclination sensing device and the wind speed information collected by the wind speed sensing device. Based on the wind speed information, determine whether the inclination information is inclination information to be compensated. Wherein, the wind speed corresponding to the inclination information to be compensated is greater than a preset threshold. If so, determine the compensation coefficient corresponding to the wind speed information, and through the preset algorithm and the compensation coefficient, determine the compensated inclination angle value corresponding to the inclination information to be compensated. Based on the compensated inclination angle value and the tower information of the current transmission line, determine the sag value of the current transmission line, so that the supervision terminal determines the sag state information according to the sag value.

[0072] The various embodiments in the present application are all described in a progressive manner. For the same or similar parts among the various embodiments, reference can be made to each other. Each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the description of the method embodiment.

[0073] The device and method provided by the embodiments of this application correspond one by one. Therefore, the device also has beneficial technical effects similar to those of its corresponding method. Since the beneficial technical effects of the method have been described in detail above, the beneficial technical effects of the device will not be elaborated here.

[0074] It should also be noted that the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the said element.

[0075] The above are only the embodiments of this application and are not intended to limit this application. For those skilled in the art, various changes and modifications can be made to this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the scope of the claims of this application.

Claims

1. A sag detection method for a transmission line, characterized in that, The method includes: Obtaining the inclination angle information of the transmission line collected by the inclination angle sensing device and the wind speed information collected by the wind speed sensing device; Based on the wind speed information, determining whether the inclination angle information is the inclination angle information to be compensated; wherein, the wind speed corresponding to the inclination angle information to be compensated is greater than a preset threshold; If so, determining the compensation coefficient corresponding to the wind speed information, and determining the compensation inclination angle value corresponding to the inclination angle information to be compensated through a preset algorithm and the compensation coefficient; Based on the compensation inclination angle value and the tower information of the current transmission line, determining the sag value of the current transmission line, so that the supervision terminal determines the sag state information according to the sag value; Wherein, determining the compensation coefficient corresponding to the wind speed information specifically includes: Determining the wind speed value corresponding to the wind speed information within a first preset time; Matching the wind speed value with a preset coefficient look-up table to determine the compensation coefficient corresponding to the wind speed value according to the matching result; Wherein, before matching the wind speed value with the preset coefficient look-up table, the method further includes: Obtaining a plurality of inclination angle information samples; the inclination angle information samples include a plurality of inclination angle information sequences corresponding to a plurality of different wind speed values; the inclination angle information sequence includes a plurality of included angle angle values between the cable direction and the preset direction at the suspension point of the transmission line collected at preset time intervals within a second preset time; Determining the maximum value of the included angle angle values in each of the inclination angle information sequences corresponding to the same wind speed value, and determining the time value within the second preset time corresponding to each of the maximum values; According to the time value within the second preset time corresponding to each of the maximum values and the number of the time values, determining the inclination angle noise frequency of the corresponding wind speed value; the noise frequency corresponding to the wind speed value is q1 = 1 / T1, where T1 is the sorting in the second preset time determined according to the time value within the second preset time corresponding to each of the maximum values, and the inclination angle noise frequency q of the wind speed value = (q1 + q2 +... + qn) / n, n is the number of inclination angle information sequences; the number of the time values is the same as the number of the inclination angle information sequences of the selected wind speed value; Based on each of the inclination angle noise frequencies and the preset time interval, determining the low-pass filtering coefficient corresponding to each of the inclination angle noise frequencies, and storing the low-pass filtering coefficient and the corresponding wind speed value in the preset coefficient look-up table.

2. The method according to claim 1, characterized in that, The method further includes: In the case where it is determined that the inclination angle information is not the inclination angle information to be compensated, determining the inclination angle value corresponding to the inclination angle information; Based on the inclination angle value, the tower information of the current transmission line and a preset sag formula, determining the sag value of the current transmission line, so that the supervision terminal determines the sag state information according to the sag value; wherein, the tower information at least includes: the height difference between the two towers corresponding to the sag, and the span between the two towers corresponding to the sag.

3. The method according to claim 1 or 2, characterized in that, Determining the sag value of the current transmission line specifically includes: Determining the tangent value of the inclination angle according to the compensation inclination angle value or the inclination angle value; Determining the sag value of the current transmission line according to the tangent value of the inclination angle, the tower information and the preset sag formula.

4. The method according to claim 1, wherein Determine the compensated inclination angle value corresponding to the inclination angle information to be compensated through a preset algorithm and the compensation coefficient, specifically including: Input the compensation coefficient into the preset algorithm to determine a corresponding first-order low-pass filter; Input the inclination angle information to be compensated into the first-order low-pass filter to calculate the compensated inclination angle value.

5. The method according to claim 1, wherein The method further includes: When there is a height difference between the two towers corresponding to the sag of the current transmission line, the inclination angle sensing device is arranged at the wire hanging end of the first tower among the two towers; wherein, the absolute height of the first tower is higher than the absolute height of the other tower among the two towers.

6. The method according to claim 5, wherein The span between the two towers is greater than the height difference.

7. The method according to claim 1, wherein The current transmission line is an all-dielectric self-supporting optical cable ADSS.

8. An equipment for detecting the sag of a transmission line, characterized in that, The device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for detecting the sag of a transmission line according to any one of claims 1-7 above.

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