Method and device for predicting safe clearance distance of power transmission line

Abstract

The invention provides a safety clearance distance prediction method and device for a power transmission line, and belongs to the technical field of power transmission line clearance analysis. The method comprises the following steps: acquiring lead parameters, line parameters and meteorological data of a target power transmission line; wherein the meteorological data comprises wind direction data and temperature data; determining a vertical wind speed component of the target power transmission line according to the wind direction data and the line parameters; determining the surface temperature of the target power transmission line according to the temperature data and the vertical wind speed component; and predicting the safety clearance distance of the target power transmission line according to the wire parameters, the temperature data, the line parameters and the surface temperature. According to the method, manual operation is not needed, the safety of workers can be ensured, the safety risk is reduced, the used data can be acquired through equipment, the time consumed by data acquisition is shortened, and the prediction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead line clearance analysis, and particularly to a method and device for predicting the safe clearance distance of overhead lines. Background Art

[0002] During the long-term outdoor operation of the power grid, overhead lines are extremely vulnerable to various natural disasters. For example, strong winds may cause the lines to gallop, insulators to flash over, and towers to tilt, resulting in wind-induced flashovers. In high-temperature environments, overhead lines are prone to increased sag, causing the distance between the overhead lines and the ground to be less than the safe distance, making it very easy for the lines to break, greatly increasing the risk of discharge between the overhead lines and nearby objects and being damaged by external forces, and even causing serious accidents such as personal injuries and flashovers, leading to large-scale power outages and even the collapse of the local power grid, resulting in huge economic losses.

[0003] Overhead lines operate continuously throughout the year, and it is especially necessary to ensure the safe operation of overhead lines. Usually, drones are used for overhead line clearance analysis. However, at present, the inspection of overhead line clearance safety hazards mainly uses ground measuring instruments and combines with personnel experience to determine the shortest distance between trees, buildings, etc. and the overhead lines. Such methods are often restricted by many factors, such as tree height, terrain, building occlusion, etc., so the positions of overhead line safety hazard points cannot be reasonably measured. Further, the traditional method requires personnel to be on-site or perform live work online, which is inefficient and risky, especially not suitable for operating in mountainous areas, forest areas, and areas with dense trees.

[0004] Regarding the problems of low efficiency and high risk in the overhead line clearance safety analysis in the related art, no effective solution has been proposed yet. Summary of the Invention

[0005] Embodiments of the present invention provide a method and device for predicting the safe clearance distance of overhead lines to solve the problems of low efficiency and high risk in the overhead line clearance safety analysis in the related art.

[0006] In a first aspect, embodiments of the present invention provide a method for predicting the safe clearance distance of overhead lines, including:

[0007] Obtaining the conductor parameters, line parameters, and meteorological data of the target overhead line; wherein, the meteorological data includes wind direction data and temperature data;

[0008] Determining the vertical wind speed component of the target overhead line according to the wind direction data and the line parameters;

[0009] Determining the surface temperature of the target overhead line according to the temperature data and the vertical wind speed component;

[0010] Predict the safe clearance distance of the target transmission line according to the wire parameters, temperature data, line parameters, and surface temperature.

[0011] In a possible implementation, the wind direction data includes the wind direction and the wind force level; the line parameters include the angle between the target transmission line and the preset azimuth.

[0012] Determine the vertical wind speed component of the target transmission line according to the wind direction data and the line parameters, including:

[0013] Represent the wind direction according to the preset azimuth angle.

[0014] Determine the wind speed based on the wind force level.

[0015] Determine the vertical wind speed component of the target transmission line according to the wind speed, the wind direction azimuth angle, and the angle between the target transmission line and the preset azimuth.

[0016] In a possible implementation, determine the vertical wind speed component of the target transmission line according to the wind speed, the wind direction azimuth angle, and the angle between the target transmission line and the preset azimuth, including:

[0017] Determine all the wind direction azimuth angles between the perpendicular of the wire on the target transmission line and the wire on the target transmission line.

[0018] For any wind direction azimuth angle, calculate the relative angle between the wind direction azimuth angle and the target transmission line; according to the relative angle, the wind speed, and the angle between the target transmission line and the preset azimuth, calculate the vertical wind speed component corresponding to the wind direction azimuth angle.

[0019] Among the vertical wind speed components corresponding to all the wind direction azimuth angles, select the maximum vertical wind speed component as the vertical wind speed component of the target transmission line.

[0020] In a possible implementation, the relative angle, the wind speed, the angle between the target transmission line and the preset azimuth, and the vertical wind speed component satisfy the following relationship:

[0021] V y⊥ = V|sin(β - γ)|

[0022] Where, V y⊥ is the vertical wind speed component; V is the wind speed; β is the relative angle; γ is the angle between the target transmission line and the preset azimuth.

[0023] In a possible implementation, the temperature data includes the ambient temperature.

[0024] Determine the surface temperature of the wire on the target transmission line according to the temperature data and the vertical wind speed component, including:

[0025] The sum of the ambient temperature and the convective heat dissipation value caused by air flow is used as the surface temperature of the conductor on the target transmission line; wherein, the convective heat dissipation value caused by air flow is determined by simulating the surface temperature of the conductor on the target transmission line under the vertical wind speed component at a preset temperature and based on the simulation results.

[0026] In a possible implementation manner, predicting the safe clearance distance of the target transmission line according to the conductor parameters, temperature data, line parameters, vertical wind direction data, and surface temperature includes:

[0027] Calculating the sag of the target transmission line according to the conductor parameters, temperature data, and surface temperature;

[0028] Based on the sag and line parameters, obtaining the predicted value of the safe clearance distance of the target transmission line.

[0029] In a possible implementation manner, the conductor parameters include the self-weight per unit length, horizontal span, initial tension, elastic modulus, and expansion coefficient of the conductor in the target transmission line;

[0030] The conductor parameters, temperature data, surface temperature, and sag of the target transmission line satisfy the following conditions:

[0031]

[0032] Wherein, f is the sag of the target transmission line; ω is the self-weight per unit length of the conductor in the target transmission line; L is the horizontal span; T0 is the initial tension; E is the elastic modulus; t 观测 is the ambient temperature at the time of conductor installation; t 表面 is the surface temperature; α is the conductor expansion coefficient.

[0033] In a possible implementation manner, the line parameters include the height of the conductor suspension point;

[0034] Based on the sag and line parameters, obtaining the predicted value of the safe clearance distance of the target transmission line includes:

[0035] Calculating the predicted value of the safe clearance distance of the target transmission line according to the sag and the height of the conductor suspension point.

[0036] In a possible implementation manner, the sag, the height of the conductor suspension point, and the predicted value of the safe clearance distance of the target transmission line satisfy the following relationship:

[0037] y min = y max - f

[0038] Wherein, y min is the predicted value of the safe clearance distance of the target transmission line; y max is the height of the conductor suspension point.

[0039] In a second aspect, an embodiment of the present invention provides a safety clearance distance prediction device for a transmission line, including:

[0040] An acquisition module, configured to obtain conductor parameters, line parameters, and meteorological data of a target transmission line; wherein, the meteorological data includes wind direction data and temperature data;

[0041] A calculation module, configured to determine the vertical wind speed component of the target transmission line according to the wind direction data and the line parameters;

[0042] The calculation module is further configured to determine the surface temperature of the target transmission line according to the temperature data and the vertical wind speed component;

[0043] A prediction module, configured to predict the safety clearance distance of the target transmission line according to the conductor parameters, temperature data, line parameters, and surface temperature.

[0044] The embodiment of the present invention provides a method and a device for predicting the safety clearance distance of a transmission line. By monitoring the conductor parameters, line parameters, and meteorological data of the target transmission line in real time and predicting the safety clearance distance of the target transmission line through these data, potential safety hazards can be effectively warned, and measures can be taken in advance to avoid accidents such as electric shock and fire caused by insufficient clearance distance of the conductor, significantly improving the safety of the transmission line. Moreover, in the processing process, it is considered that the wind direction, wind speed, and surface temperature will affect the expansion or contraction of the conductor, thereby affecting the sag of the conductor, and the predicted result of the safety clearance distance obtained finally can be made more accurate. The embodiment of the present invention does not require manual operation, can ensure the safety of the staff, reduce the safety risk, and the data used can be collected by equipment, reducing the time consumed for data collection and improving the prediction efficiency. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 is a flowchart of the implementation of the method for predicting the safety clearance distance of a transmission line provided by the embodiment of the present invention;

[0047] Figure 2 is a schematic diagram of the 16 azimuth angles;

[0048] Figure 3It is a schematic diagram of the included angle between the wind direction and the line direction of the safety clearance distance prediction method for a transmission line provided by an embodiment of the present invention;

[0049] Figure 4 It is a flowchart of the implementation of the safety clearance distance prediction method for a transmission line provided by another embodiment of the present invention;

[0050] Figure 5 It is a schematic structural diagram of the safety clearance distance prediction device for a transmission line provided by an embodiment of the present invention. Detailed implementation manners

[0051] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present invention.

[0052] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will be described through specific embodiments with reference to the accompanying drawings.

[0053] Figure 1 It is a flowchart of the implementation of a safety clearance distance prediction method for a transmission line provided by an embodiment of the present invention. As Figure 1 shown, the method includes:

[0054] Step 110: Obtain the wire parameters, line parameters, and meteorological data of the target transmission line; wherein, the meteorological data includes wind direction data and temperature data.

[0055] In this embodiment, the wire on the target transmission line can be an overhead carbon fiber composite wire. Among them, the wire parameters can include the self-weight per unit length, horizontal span, initial tension, elastic modulus, and expansion coefficient of the wire; the line parameters can include the included angle between the target transmission line and the preset azimuth and the height of the wire suspension point; the wind direction data can include the wind direction and the wind force level; the temperature data can include the ambient temperature on the surface of the wire on the target transmission line.

[0056] In this embodiment, the obtained meteorological data can be multiple sets of meteorological data within a preset time.

[0057] Step 120: Determine the vertical wind direction data of the target transmission line according to the wind direction data and the line parameters.

[0058] In an optional embodiment, determining the vertical wind direction data of the target transmission line according to the wind direction data and the line parameters may include:

[0059] The wind direction is represented according to a preset azimuth angle.

[0060] The wind speed is determined based on the wind force level.

[0061] According to the wind speed, the wind direction azimuth angle, and the included angle between the target transmission line and the preset azimuth, the vertical wind speed component of the target transmission line is determined.

[0062] Figure 2 It is a schematic diagram of the 16 azimuth angles. The following will be combined with Figure 2 to illustrate this embodiment.

[0063] In this embodiment, the preset azimuth angle can be the 16 azimuth angles. Correspondingly, the wind direction can be represented according to the 16 azimuth angles. Specifically, the due north direction is equally divided into 16 parts, and the included angle between adjacent azimuths is 22.5°. Considering that weather forecasts usually provide the wind direction and wind force level, the wind direction angle is relaxed here. The specific operation is as follows: taking the 16 azimuth angles as an example, for any wind direction of α, the range of this wind direction angle is [α - 22.5°, α + 22.5°]. Among them, Table 1 is the wind speed level comparison table, as shown in Table 1:

[0064] Table 1 Wind speed level comparison table

[0065] Wind speed Wind force 0 m / s Calm wind 1 m / s Force 1 2 m / s Force 2 3 - 4 m / s Force 3 5 - 7 m / s Force 4 8 - 9 m / s Force 5 10 - 12 m / s Force 6 13 - 16 m / s Force 7 17 - 19 m / s Force 8 20 - 23 m / s Force 9 24 - 26 m / s Force 10 27 - 31 m / s Force 11 Greater than 35 m / s Force 12

[0066] In Table 1, different wind forces correspond to different wind speed ranges. The wind force can be determined according to the weather forecast, and then the wind speed range corresponding to this wind force can be determined in Table 1.

[0067] Figure 3 It is a schematic diagram of the included angle between the wind direction and the line direction of the transmission line provided by the embodiment of the present invention. As Figure 3 shown, the due north direction can be used as the preset azimuth. Correspondingly, the included angle between the target transmission line and the preset azimuth is the included angle between the target transmission line and the due north direction. Then, all the wind direction azimuth angles between the perpendicular line of the conductor on the target transmission line and the conductor on the target transmission line are determined, that is, ±90° based on the included angle between the target transmission line and the due north direction, and all the wind direction azimuth angles between the perpendicular line of the conductor on the target transmission line and the conductor on the target transmission line are used as the calculation target.

[0068] For any wind direction azimuth angle, calculate the relative included angle between this wind direction azimuth angle and the target transmission line. Then, through the following formula, calculate the vertical wind speed component corresponding to this wind direction azimuth angle:

[0069] V y⊥ = V|sin(β - γ)|

[0070] Among them, V y⊥is the vertical wind speed component; V is the wind speed; β is the relative angle; γ is the angle between the target transmission line and the preset direction. In the formula, V can take the average value in the wind speed range corresponding to the wind force.

[0071] Compare the vertical wind speed components corresponding to all wind direction azimuth angles, and take the largest vertical wind speed component as the vertical wind speed component on the target transmission line.

[0072] Step 130: Determine the surface temperature of the target transmission line according to the temperature data and the vertical wind speed component.

[0073] In this embodiment, considering the heat transfer effect of natural wind on overhead transmission conductors, the convective heat dissipation value caused by air flow can be determined based on the vertical wind speed component.

[0074] Using the heat conservation formula, we can get:

[0075] T 表面 = T 环境 + f(x)

[0076] Among them, T 环境 is the ambient temperature; f(x) is the convective heat dissipation value caused by air flow.

[0077] At the preset temperature, simulate the surface temperature of the conductor on the target transmission line under different vertical wind speed vectors. Fit f(x) with a power function according to the simulation experiment data, and get:

[0078] f(x) = 17.882v y⊥ -0.488

[0079] Correspondingly, considering the influence of wind speed, the surface temperature of the target transmission line can be expressed as:

[0080] t 表面 = t 环境 + 17.882V y⊥ -0.488

[0081] Among them, t 环境 is the ambient temperature.

[0082] Step 140: Predict the safe clearance distance of the target transmission line according to the conductor parameters, temperature data, line parameters and surface temperature.

[0083] In this embodiment, considering that temperature affects the length change of the wire through the coefficient of thermal expansion α, which in turn affects the sag of the wire. The greater the temperature change, the more obvious the expansion or contraction of the wire, and the greater the impact on the sag. Therefore, when predicting the safety clearance distance in this embodiment, the surface temperature on the target transmission line is taken into account. Correspondingly, in an alternative embodiment, predicting the safety clearance distance of the target transmission line based on wire parameters, temperature data, line parameters, and surface temperature may include:

[0084] Calculate the sag of the target transmission line according to the wire parameters, temperature data, and surface temperature.

[0085] Based on the sag and line parameters, obtain the predicted value of the safety clearance distance of the target transmission line.

[0086] In this embodiment, the calculation of the sag of the wire made of carbon fiber composite material is slightly different from the sag calculation formula of ordinary steel-reinforced aluminum stranded wire, and its sag calculation formula can be expressed as:

[0087]

[0088] where f is the sag of the target transmission line; ω is the self-weight per unit length of the wire in the target transmission line; L is the horizontal span; T0 is the initial tension; E is the elastic modulus; t 观测 is the ambient temperature during wire installation; t 表面 is the surface temperature; α is the wire expansion coefficient.

[0089] Correspondingly, the predicted value of the safety clearance distance of the target transmission line can be calculated by the following formula:

[0090] y min = y max - f

[0091] where y min is the predicted value of the safety clearance distance of the target transmission line; y max is the height of the wire suspension point.

[0092] In summary, the embodiments of the present invention evaluate and predict the sag value of an overhead transmission line in real time based on the wind speed, wind direction, and ambient temperature predicted by the meteorological department, the real-time conductor temperature transmitted by the dispatching department, and the existing span data value. Considering the differences in the voltage levels of transmission conductors, spans, and arrangement methods, etc. According to the height of the lowest point of the sag, the spatial position where it is located is deduced and compared with the minimum electrical safety distance between the conductor and adjacent objects specified in the design specifications of the transmission line respectively, and the minimum distance between the conductor and the ground is calculated based on the suspension point height. It can provide a reliable basis for height restrictions in situations such as large-piece transportation, ship passage, tree growth, and elevated construction. It can effectively warn of possible safety hazards, take measures in advance, and avoid accidents such as electric shock and fire caused by insufficient clearance, significantly improving the safety of the transmission line.

[0093] Figure 4 FIG. 4 is a flowchart for implementing a method for predicting the safety clearance distance of a transmission line provided by another embodiment of the present invention; as Figure 4 shown, in this embodiment, the method can be applied to an overhead carbon fiber composite core conductor. Specifically, the method may include obtaining the conductor parameters and line parameters of the overhead carbon fiber composite core conductor. The wind direction in the weather forecast is processed into a 16-direction differentiation, and based on the differentiation result, the vertical wind speed of the conductor is calculated, that is, the vertical wind speed component. Considering the heat dissipation effect of convective heat transfer on the temperature of the transmission conductor, the surface temperature of the carbon fiber composite core conductor is calculated according to the ambient temperature and the vertical wind speed component. According to the conductor parameters, temperature data, and surface temperature, the sag of the target transmission line is calculated. Then, based on the sag and the line parameters, the safe distance of the overhead transmission conductor from the ground is obtained, that is, the predicted value of the safety clearance distance of the target transmission line.

[0094] In summary, the method provided by the embodiments of the present invention can effectively warn of possible safety hazards by real-time monitoring and predicting the clearance distance of the overhead carbon fiber composite core conductor, take measures in advance, and avoid accidents such as electric shock and fire caused by insufficient clearance, significantly improving the safety of the transmission line. It can provide relatively accurate warning information and prediction data, enabling maintenance personnel to conduct targeted line inspections and maintenance, avoiding blind and repetitive inspection work, improving the maintenance efficiency and effect, and saving human and material resources. The carbon fiber composite core conductor has good mechanical properties and environmental resistance. Combining this warning evaluation and prediction method, it can operate reliably under various complex environmental conditions, further enhancing the adaptability and stability of the transmission line.

[0095] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution. The execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0096] The following is an apparatus embodiment of the present invention. For details not described in detail herein, reference may be made to the corresponding method embodiment above.

[0097] Figure 5 The structural schematic diagram of the safety clearance distance prediction device for a transmission line provided by an embodiment of the present invention is shown. For ease of description, only parts related to the embodiment of the present invention are shown and are described in detail as follows:

[0098] As Figure 5 shown, the safety clearance distance prediction device 5 for a transmission line includes:

[0099] An acquisition module 51, configured to obtain conductor parameters, line parameters, and meteorological data of a target transmission line; wherein, the meteorological data includes wind direction data and temperature data;

[0100] A calculation module 52, configured to determine the vertical wind speed vector of the target transmission line according to the wind direction data and the line parameters;

[0101] The calculation module 52 is further configured to determine the surface temperature of the target transmission line according to the temperature data and the vertical wind speed vector;

[0102] A prediction module 53, configured to predict the safety clearance distance of the target transmission line according to the conductor parameters, temperature data, line parameters, and surface temperature.

[0103] In a possible implementation manner, the wind direction data includes wind direction and wind force level; the line parameters include the included angle between the target transmission line and a preset azimuth;

[0104] The calculation module 52 is specifically configured to:

[0105] Represent the wind direction according to a preset azimuth angle;

[0106] Determine the wind speed based on the wind force level;

[0107] Determine the vertical wind speed component of the target transmission line according to the wind speed, the wind direction azimuth angle, and the included angle between the target transmission line and the preset azimuth.

[0108] In a possible implementation manner, the calculation module 52 is specifically configured to:

[0109] Determine all the wind direction azimuth angles between the perpendicular line of the conductor on the target transmission line and the conductor on the target transmission line;

[0110] For any one wind direction azimuth angle, calculate the relative included angle between the wind direction azimuth angle and the target transmission line; according to the relative included angle, the wind speed, and the included angle between the target transmission line and the preset azimuth, calculate the vertical wind speed component corresponding to the wind direction azimuth angle.

[0111] Among the vertical wind speed components corresponding to all wind direction azimuth angles, select the maximum vertical wind speed component as the vertical wind speed component of the target transmission line.

[0112] In a possible implementation, the relative angle, wind speed, angle between the target transmission line and the preset azimuth, and the vertical wind speed component satisfy the following relationship:

[0113] V y⊥ = V|sin(β - γ)|

[0114] where, V y⊥ is the vertical wind speed component; V is the wind speed; β is the relative angle; γ is the angle between the target transmission line and the preset azimuth.

[0115] In a possible implementation, the temperature data includes the ambient temperature;

[0116] The calculation module 52 is specifically configured to:

[0117] Take the sum of the ambient temperature and the convective heat dissipation value caused by air flow as the surface temperature of the conductor on the target transmission line; wherein, the convective heat dissipation value caused by air flow is determined by simulating the surface temperature of the conductor on the target transmission line under the vertical wind speed component at a preset temperature and based on the simulation results.

[0118] In a possible implementation, the prediction module 53 is specifically configured to:

[0119] Calculate the sag of the target transmission line according to the conductor parameters, temperature data, and surface temperature;

[0120] Based on the sag and line parameters, obtain the predicted value of the safe clearance distance of the target transmission line.

[0121] In a possible implementation, the conductor parameters include the self-weight per unit length, horizontal span, initial tension, elastic modulus, and expansion coefficient of the conductor in the target transmission line;

[0122] The conductor parameters, temperature data, surface temperature, and sag of the target transmission line satisfy the following conditions:

[0123]

[0124] where, f is the sag of the target transmission line; ω is the self-weight per unit length of the conductor in the target transmission line; L is the horizontal span; T0 is the initial tension; E is the elastic modulus; t 观测 is the ambient temperature at the time of conductor installation; t 表面 is the surface temperature; α is the conductor expansion coefficient.

[0125] In a possible implementation, the line parameters include the height of the conductor suspension point;

[0126] The prediction module 53 is specifically configured to:

[0127] Calculate the predicted value of the safe clearance distance of the target transmission line according to the sag and the height of the wire suspension point.

[0128] In a possible implementation, the sag, the height of the wire suspension point, and the predicted value of the safe clearance distance of the target transmission line satisfy the following relationship:

[0129] y min = y max - f

[0130] where y min is the predicted value of the safe clearance distance of the target transmission line; y max is the height of the wire suspension point.

[0131] In the above embodiments, the descriptions of the respective embodiments have their own focuses. For parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0132] Those of ordinary skill in the art can realize that, in combination with the templates, units, and algorithm steps of the examples described in the embodiments disclosed herein, they can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the present invention.

[0133] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, to implement all or part of the processes in the above method embodiments of the present invention, it can also be completed by a computer program instructing the relevant hardware. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of the above embodiments of the method for predicting the safe clearance distance of each transmission line can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file, or some intermediate form, etc. The computer-readable medium can include: any entity or device that can carry the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0134] The above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for predicting safe clearance distance of a transmission line, characterized in that: include: Acquire conductor parameters, line parameters and meteorological data of the target transmission line; wherein the meteorological data includes wind direction data and temperature data; Determine the vertical wind speed component of the target transmission line according to the wind direction data and the line parameters; determining a surface temperature of the target transmission line based on the temperature data and the vertical wind speed component; A safe clearance distance of the target transmission line is predicted based on the conductor parameters, the temperature data, the line parameters and the surface temperature.

2. The method for predicting safe clearance distance of a power transmission line according to claim 1, characterized in that: The wind direction data includes wind direction and wind force level; the line parameters include the angle between the target transmission line and the preset direction; Determining the vertical wind speed component of the target transmission line according to the wind direction data and the line parameters includes: Representing the wind direction according to a preset azimuth; determining a wind speed based on the wind force level; The vertical wind speed component of the target power transmission line is determined according to the wind speed, the azimuth of the wind direction and the angle between the target power transmission line and a preset azimuth.

3. The method for predicting safe clearance distance of a power transmission line according to claim 2, characterized in that: Determining the vertical wind speed component of the target transmission line according to the wind speed, the wind direction azimuth, and the angle between the target transmission line and the preset azimuth includes: Determine all wind direction azimuths between a perpendicular line of a conductor on the target transmission line and the conductor on the target transmission line; For any wind direction azimuth, calculate the relative angle between the wind direction azimuth and the target power transmission line; calculate the vertical wind speed component corresponding to the wind direction azimuth according to the relative angle, the wind speed and the angle between the target power transmission line and the preset azimuth; Among the vertical wind speed components corresponding to all wind direction azimuths, the largest vertical wind speed component is selected as the vertical wind speed component of the target transmission line.

4. The method for predicting safe clearance distance of a power transmission line according to claim 3, characterized in that: The relative angle, the wind speed, the angle between the target transmission line and the preset orientation, and the vertical wind speed component satisfy the following relationship: V y⊥ =V|sin(β-γ)| Among them, V y⊥ is the vertical wind speed component; V is the wind speed; β is the relative angle; γ is the angle between the target transmission line and the preset direction.

5. The method for predicting safe clearance distance of a power transmission line according to claim 1, characterized in that: The temperature data includes ambient temperature; Determining the surface temperature of the conductor on the target transmission line according to the temperature data and the vertical wind speed component comprises: The sum of the ambient temperature and the convective heat dissipation value caused by air flow is used as the surface temperature of the conductor on the target transmission line; wherein the convective heat dissipation value caused by air flow is determined by simulating the surface temperature of the conductor on the target transmission line under the vertical wind speed component at a preset temperature, and based on the simulation result.

6. The method for predicting safe clearance distance of a power transmission line according to claim 1, characterized in that: The predicting of the safe clearance distance of the target transmission line according to the conductor parameters, the temperature data, the line parameters and the surface temperature comprises: Calculating the sag of the target transmission circuit according to the conductor parameters, the temperature data and the surface temperature; Based on the sag and the line parameters, a predicted value of a safe clearance distance of the target transmission line is obtained.

7. The method for predicting safe clearance distance of a power transmission line according to claim 6, characterized in that: The conductor parameters include the deadweight per unit length, horizontal span, initial tension, elastic modulus and expansion coefficient of the conductor in the target transmission line; The conductor parameters, the temperature data, the surface temperature and the sag of the target transmission circuit meet the following conditions: Wherein, f is the sag of the target transmission line; ω is the deadweight per unit length of the conductor in the target transmission line; L is the horizontal span; T0 is the initial tension; E is the elastic modulus; t 观测 is the ambient temperature when the conductor is installed; t 表面 is the surface temperature; α is the wire expansion coefficient.

8. The method for predicting safe clearance distance of a power transmission line according to claim 6, characterized in that: The line parameters include the height of the conductor suspension point; The step of obtaining a predicted value of a safe clearance distance of the target transmission line based on the sag and the line parameters includes: According to the sag and the height of the conductor suspension point, a predicted value of the safe clearance distance of the target transmission line is calculated.

9. The method for predicting safe clearance distance of a power transmission line according to claim 8, characterized in that: The sag, the height of the conductor suspension point and the predicted value of the safe clearance distance of the target transmission line satisfy the following relationship: y min =y max -f Among them, y min is the predicted value of the safe clearance distance of the target transmission line; max is the height of the wire suspension point.

10. A safe clearance distance prediction device for a power transmission line, characterized in that: include: A collection module, used to obtain conductor parameters, line parameters and meteorological data of the target transmission line; wherein the meteorological data includes wind direction data and temperature data; A calculation module, used to determine the vertical wind speed component of the target transmission line according to the wind direction data and the line parameters; The calculation module is further used to determine the surface temperature of the target transmission line according to the temperature data and the vertical wind speed component; A prediction module is used to predict the safe clearance distance of the target transmission line according to the conductor parameters, the temperature data, the line parameters and the surface temperature.

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