Method and device for measuring dynamic crossing distance of power transmission line

Abstract

The invention relates to a power transmission line dynamic crossing distance measurement method and device, and the method comprises the steps: obtaining a distributed sensing data flow which comprises wire strain data, microclimate sensing data and unmanned plane sensing data; establishing a self-adaptive catenary model, and dynamically updating the self-adaptive catenary model based on the distributed sensing data flow; and establishing a space model of the two crossed transmission lines according to the updated self-adaptive catenary model, and resolving to obtain a dynamic crossed span distance of the two crossed transmission lines. According to the method, the self-adaptive catenary model is dynamically updated by fusing the distributed sensing data flow, so that the problems that the prior art is greatly restricted by the environment and dynamic deformation cannot be responded in real time are solved, errors caused by the fact that a static model adopts a fixed load ratio are overcome, and the real-time performance and reliability of power transmission line crossing safety monitoring are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-voltage transmission line safety monitoring, and particularly relates to a dynamic crossing distance measurement method and device for a transmission line. BACKGROUND

[0002] Insufficient crossing distance of a transmission line is one of the main causes of discharge tripping accidents, so monitoring and measuring the crossing distance of a transmission line has become a key to the construction and operation of a transmission line. However, when the transmission line is erected in a complex environment, the difficulty of monitoring and measuring the crossing distance of the transmission line also increases. For example, the manual observation method requires tower climbing, which is difficult and dangerous to implement in mountainous areas or rainy and foggy weather. The unmanned aerial vehicle surveying method relies on visible light vision, which is difficult to implement at night or in foggy scenes. The static model method can monitor and measure through the construction of a catenary equation, but it does not consider the stretching deformation of the conductor under high temperature or icing conditions because it uses a fixed load ratio parameter. Therefore, the existing technology is greatly affected by the environment, and cannot synchronously respond to dynamic deformation caused by environmental mutations, resulting in a large error in the calculation of the crossing distance. SUMMARY

[0003] To solve the above problems in the prior art, the present application provides a dynamic crossing distance measurement method for a transmission line. The technical problem to be solved by the present application is solved by the following technical scheme: The present application provides a dynamic crossing distance measurement method for a transmission line, comprising: obtaining a distributed sensing data stream, the distributed sensing data stream comprising conductor strain data, micro-meteorological perception data and unmanned aerial vehicle sensing data; establishing an adaptive catenary model and dynamically updating the adaptive catenary model based on the distributed sensing data stream; establishing a spatial model of two crossing transmission lines according to the updated adaptive catenary model, and solving to obtain the dynamic crossing distance of the two crossing transmission lines.

[0004] In an embodiment of the present application, the expression of the adaptive catenary model is: ; wherein, is the coordinate of the crossing transmission line along the z-axis direction; is the horizontal distance from the low suspension point; is the initial specific load; is the strain-specific load coefficient; is the real-time axial strain, is the strain-specific load dynamic mapping; is the wind vibration coupling term, is a wind resistance coefficient, is a wind speed vector modulus; is a time parameter; is a hyperbolic cosine function; is a temperature deformation term, is a material thermal expansion coefficient, is a temperature parameter, is an initial temperature parameter.

[0005] In an embodiment of the present application, the expression of the spatial model of the two intersecting power transmission lines is respectively: ; ; wherein, is a coordinate of the first intersecting power transmission line along the z-axis direction; is a load ratio of the first intersecting power transmission line; is a coordinate of the first intersecting power transmission line along the x-axis direction; is a horizontal distance between a low suspension point and a lowest point of the first intersecting power transmission line; is a coordinate of the first intersecting power transmission line along the y-axis direction; is a sag of the low suspension point of the first intersecting power transmission line; is a coordinate of the second intersecting power transmission line along the z-axis direction; is a load ratio of the second intersecting power transmission line; is a coordinate of the second intersecting power transmission line along the x-axis direction; is a coordinate of the second intersecting power transmission line along the y-axis direction; is a sag of the low suspension point of the second intersecting power transmission line; is a coordinate of the low suspension point of the second intersecting power transmission line along the x-axis direction; is a horizontal distance between a low suspension point and a lowest point of the second intersecting power transmission line; is a ground projection included angle; is a coordinate of the low suspension point of the second intersecting power transmission line along the y-axis direction; is a sine function; is a cosine function; is a tangent function.

[0006] In an embodiment of the present application, the static expression of the intersecting span distance of the two intersecting power transmission lines is: ; wherein, is a dynamic intersecting span distance of the two intersecting power transmission lines; is a cotangent function; The coordinate of the low-hanging point of the second crossing power transmission line along the z-axis direction.

[0007] In an embodiment of the present application, the dynamic crossing span distance of the two crossing power transmission lines is calculated, comprising: The coordinates of the crossing span points of the two crossing power transmission lines are unified to the geodetic coordinate system; Dynamic buffer zones are respectively established near the projection domains of the crossing span points of the two crossing power transmission lines, and discrete point sets of the two crossing power transmission lines in the dynamic buffer zones are respectively extracted; According to the discrete point sets, a plurality of crossing span distances are obtained by the static expression of the crossing span distance of the two crossing power transmission lines; According to the plurality of crossing span distances, the minimum Euclidean distance is obtained by the nearest neighbor search, and the minimum Euclidean distance is the dynamic crossing span distance of the two crossing power transmission lines.

[0008] In an embodiment of the present application, the minimum Euclidean distance The expression is: ; Among them, is a minimum value function; is the coordinate of the crossing span point of the first crossing power transmission line; is the coordinate of the crossing span point of the second crossing power transmission line.

[0009] In an embodiment of the present application, after the dynamic crossing span distance of the two crossing power transmission lines is calculated, the following steps are further included: The basic safety distance threshold is set, and when the crossing span distance is less than or equal to the basic safety distance threshold, a warning is given.

[0010] In an embodiment of the present application, the warning is a hierarchical warning, including: first-level warning and second-level warning; When , the first-level warning is triggered, and a short message is pushed to the operation and maintenance personnel; When and lasts at least 120 seconds, the second-level warning is triggered, and a physical disposal procedure for the power transmission line is started; Among them, is the basic safety distance threshold.

[0011] This invention also provides a dynamic crossing distance measurement device for transmission lines, used to implement the above-mentioned dynamic crossing distance measurement method for transmission lines. The device includes: a distributed sensing module, set near the crossing point of two crossing transmission lines, used to acquire distributed sensing data streams; an adaptive catenary module, used to establish an adaptive catenary model and dynamically update the adaptive catenary model based on the distributed sensing data streams; a dynamic crossing distance calculation module, used to establish a spatial model of the two crossing transmission lines based on the updated adaptive catenary model and calculate the dynamic crossing distance of the two crossing transmission lines; and a threshold warning module, used to set a basic safety distance threshold and issue a warning when the crossing distance is less than or equal to the basic safety distance threshold.

[0012] In one embodiment of the present invention, the distributed sensing module includes: a fiber optic strain sensor group, a micro-meteorological sensing terminal, and a drone. The fiber optic strain sensor group is respectively disposed on the two intersecting power transmission lines to acquire conductor strain data. Each fiber optic strain sensor group includes multiple fiber optic strain sensors, and the distance between two adjacent fiber optic strain sensors on the same intersecting power transmission line is less than or equal to 10 meters. The micro-meteorological sensing terminal is disposed on the top of the tower to acquire micro-meteorological sensing data, including wind speed vector, ambient temperature, relative humidity, and atmospheric pressure. The drone is used to acquire drone sensing data, including conductor spatial coordinates and temperature field distribution information.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a method for measuring the dynamic crossing distance of transmission lines. By integrating distributed sensor data streams to dynamically update the adaptive catenary model, it solves the problems of existing technologies being greatly constrained by the environment and unable to respond to dynamic deformation in real time. It also overcomes the limitations of manual observation and UAV aerial surveying in complex environments. Furthermore, by correcting model parameters through distributed sensor data streams, it synchronously responds to the dynamic deformation of conductors caused by wind load, temperature changes, or icing, overcoming the errors caused by static models using fixed load ratios. This significantly improves the real-time performance and reliability of safety monitoring of transmission line crossings.

[0014] This invention improves the timeliness of safety monitoring of transmission line crossings by accurately calculating the minimum Euclidean distance of the discrete point set of the crossing lines as the dynamic crossing distance and combining it with a hierarchical early warning mechanism.

[0015] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0016] Figure 1 This is a flowchart of a method for measuring the dynamic crossing distance of transmission lines provided in an embodiment of the present invention; Figure 2 This is a model diagram of a catenary provided in an embodiment of the present invention; Figure 3 This is a spatial model diagram of two intersecting transmission lines provided in an embodiment of the present invention; Figure 4 This is a flowchart illustrating the workflow of the power transmission line dynamic crossing distance measurement device provided in this embodiment of the invention. Detailed Implementation

[0017] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following describes in detail a method and device for measuring the dynamic crossing distance of transmission lines according to the present invention, in conjunction with the accompanying drawings and specific embodiments.

[0018] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of specific embodiments in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and concrete understanding can be gained of the technical means and effects adopted by the present invention to achieve its intended purpose. However, the accompanying drawings are for reference and illustration only and are not intended to limit the technical solutions of the present invention.

[0019] Example 1 like Figure 1 As shown, Figure 1 This is a flowchart of a method for measuring the dynamic crossing distance of power transmission lines provided in an embodiment of the present invention.

[0020] In this embodiment, the method for measuring the dynamic crossing distance of transmission lines includes: Step 1: Acquire distributed sensor data streams, which include: conductor strain data, micro-meteorological sensing data, and UAV sensor data.

[0021] like Figure 2 As shown, Figure 2 This is a model diagram of a catenary provided in an embodiment of the present invention, wherein, The height difference between the suspension points; The distance between the suspension points; This is the lowest point of the crossing transmission line; Low suspension point; For high suspension points; For low suspension point Sag; For low suspension point The lowest point of the crossing transmission line The horizontal spacing between them; For high suspension point The lowest point of the crossing transmission line The horizontal spacing between them; The coordinates of the crossing transmission lines along the z-axis; Let be the coordinates of the crossing transmission line along the x-axis. The expression for its basic static model is: ; ; in, It is the ratio of the horizontal stress at the lowest point of the crossing transmission line to the load-bearing ratio, i.e., the load ratio. It is a hyperbolic cosine function. It is a natural constant.

[0022] Step 2: Establish an adaptive catenary model and dynamically update the adaptive catenary model based on the distributed sensor data stream.

[0023] In an optional implementation, a real-time conversion relationship between micro-strain and specific load is established using an adaptive catenary model. The expression for the adaptive catenary model is as follows: ; in, The coordinates of the crossing transmission lines along the z-axis; This is the horizontal distance from the lowest suspension point; Initial load ratio; The strain-specific load factor is determined by the Young's modulus and cross-sectional area of ​​the conductor. This represents the real-time axial strain. For strain ratio dynamic mapping; For wind-induced vibration coupling terms, This is the drag coefficient. This refers to the wind speed vector modulus; For time parameters; Let be a hyperbolic cosine function, and its formula is: ; For temperature deformation, The coefficient of thermal expansion of the material. For temperature parameters, These are the initial temperature parameters.

[0024] For example, the adaptive catenary model uses an embedded finite element solver and dynamically updates parameters based on distributed sensor data streams.

[0025] The principle behind this is that, since the adaptive catenary model is built upon the basic static model, there is an essential inheritance relationship between the two. It retains the core structure of the hyperbolic cosine function and maintains the coordinates along the z-axis. Horizontal distance The basic mapping relationship; it also continues the physical essence of sag-stress. In the basic static model, the load ratio is... Defined as a fixed parameter, i.e. a constant, while in the adaptive catenary model the load ratio It is decomposed into a function of time, and by coupling the time dimension, the relationship between the past and the present state is realized. Finally, through... The spatial term enables line attitude coupling.

[0026] like Figure 3 As shown, Figure 3 This is a spatial model diagram of two intersecting transmission lines provided in an embodiment of the present invention, wherein the two transmission lines are respectively and That is, the first crossing transmission line is The second crossing transmission line is Transmission lines From power transmission lines The two cross below, both in and An intersection occurs at the location, where, For power transmission lines The intersection point; For power transmission lines The intersection and crossing point. for and The ground projection position of the connecting line. for and The angle of the line's projection onto the ground; transmission lines and transmission lines The distance between them is the crossing distance. and The length of the connection. (Regarding the transmission line) low suspension point Establish a spatial rectangular coordinate system with the origin as the coordinate origin.

[0027] Step 3: Establish spatial models of the two crossing transmission lines based on the updated adaptive catenary model, and calculate the dynamic crossing distance of the two crossing transmission lines.

[0028] In one optional implementation, the spatial model expressions for the two crossing transmission lines are as follows: ; ; in, Let be the coordinates of the first crossing transmission line along the z-axis. The load ratio of the first crossing transmission line; The coordinates of the first crossing transmission line along the x-axis; The horizontal distance between the lowest suspension point and the lowest point of the first crossing transmission line; The coordinates of the first crossing transmission line along the y-axis; The sag at the low suspension point of the first crossing transmission line; Let be the coordinates of the second crossing transmission line along the z-axis. This represents the load ratio of the second crossing transmission line; Let x be the coordinate of the second crossing transmission line along the x-axis. The coordinates of the second crossing transmission line along the y-axis; The sag at the low suspension point of the second crossing transmission line; The coordinates of the low suspension point of the second crossing transmission line along the x-axis. The horizontal distance between the low suspension point and the lowest point of the second crossing transmission line; The angle is the angle projected onto the ground. The coordinates of the low suspension point of the second crossing transmission line along the y-axis. It is a sine function; It is a cosine function; It is the tangent function.

[0029] The second crossing transmission line The expression can be based on the first crossing transmission line. The expression is obtained by polar coordinate transformation and inverse transformation, and a spatial model of the two intersecting transmission lines is established based on the obtained spatial coordinates of each point. The location information of the intersection of the two intersecting transmission lines can be obtained through... and The ground projection position of the connecting line The reflection will Set the horizontal plane coordinates to Then the static expression for the crossing distance of the two crossing transmission lines is: ; in, This refers to the dynamic crossing distance between two intersecting transmission lines. It is the cotangent function; Let be the coordinates of the low suspension point of the second crossing transmission line along the z-axis.

[0030] In an optional implementation, step 3, calculating the dynamic crossing distance between the two crossing transmission lines, includes: Step 3.1: Unify the coordinates of the crossing points of the two intersecting transmission lines to the geodetic coordinate system; In particular, standardizing coordinates can eliminate attitude errors in UAV aerial surveying.

[0031] Step 3.2: Establish dynamic buffer zones near the projection domains of the crossing points of the two crossing transmission lines, and extract the discrete point sets of the two crossing transmission lines within the dynamic buffer zones respectively; For example, the radius of the dynamic buffer can be set to 5 meters.

[0032] Step 3.3: Based on the discrete point set, obtain multiple crossing distances corresponding to the static expression of the crossing distance of the two crossing transmission lines; Step 3.4: Based on multiple crossing distances, the minimum Euclidean distance is obtained through nearest neighbor search. The minimum Euclidean distance is the dynamic crossing distance between two crossing transmission lines.

[0033] For example, KD-Tree can be used to accelerate the nearest neighbor search to obtain the minimum Euclidean distance, so as to calculate the minimum Euclidean distance between point sets in real time, thereby dynamically obtaining the dynamic crossing distance between two crossing transmission lines.

[0034] In an optional implementation, the minimum Euclidean distance The expression is: ; in, It is a minimum value function; The coordinates of the crossing point of the first intersecting transmission line; These are the coordinates of the crossing point of the second intersecting transmission line.

[0035] In this embodiment, after calculating the dynamic crossing distance between the two crossing transmission lines, the method further includes: Step 4: Set a basic safety distance threshold, and issue an early warning when the crossing distance is less than or equal to the basic safety distance threshold.

[0036] In one optional implementation, the warning is a tiered warning, including: a first-level warning and a second-level warning; when When this occurs, a Level 1 alert is triggered, and a text message is sent to the operations and maintenance personnel. when If the warning lasts for at least 120 seconds, a Level 2 warning will be triggered, initiating a physical intervention procedure for the transmission line.

[0037] For example, the basic safety distance threshold The voltage level can be determined, and then combined with historical data to train an LSTM prediction model. When this is triggered, a Level 1 alert is sent to the operations and maintenance personnel via SMS; when If the warning lasts for at least 120 seconds, a second-level warning will be triggered, initiating physical measures for the transmission line, such as automatically activating line de-icing devices or load transfer procedures.

[0038] Furthermore, the complete workflow of early warning includes: real-time monitoring and threshold comparison, tiered early warning triggering, emergency response, data recording and analysis, system self-checking and fault tolerance processing.

[0039] It is understood that the technologies mentioned in this embodiment, such as accelerated nearest neighbor search and prediction models, are all existing mature technologies, and the related settings can be implemented with reference to existing related technologies. Therefore, they are not described in detail, and this invention does not limit them.

[0040] It is worth noting that the dynamic crossing distance measurement method for transmission lines of the present invention significantly reduces the error compared with traditional methods under complex working conditions such as high temperature and strong wind, while enhancing the stability of measured data; its full-process response time is shortened to the second level, significantly reducing the delay; and it can cover complex scenarios such as night and large spans, resulting in a significant reduction in blind spot rate.

[0041] The present invention provides a method for measuring the dynamic crossing distance of transmission lines. By integrating distributed sensor data streams to dynamically update the adaptive catenary model, it solves the problems of existing technologies being greatly constrained by the environment and unable to respond to dynamic deformation in real time. It also overcomes the limitations of manual observation and UAV aerial surveying in complex environments. Furthermore, by correcting model parameters through distributed sensor data streams, it synchronously responds to the dynamic deformation of conductors caused by wind load, temperature changes, or icing, overcoming the errors caused by static models using fixed load ratios. This significantly improves the real-time performance and reliability of safety monitoring of transmission line crossings.

[0042] This invention improves the timeliness of safety monitoring of transmission line crossings by accurately calculating the minimum Euclidean distance of the discrete point set of the crossing lines as the dynamic crossing distance and combining it with a hierarchical early warning mechanism.

[0043] Example 2 like Figure 4 As shown, Figure 4 This is a flowchart illustrating the workflow of the power transmission line dynamic crossing distance measurement device provided in this embodiment of the invention.

[0044] In this embodiment, the transmission line dynamic crossing distance measurement device is used to implement the transmission line dynamic crossing distance measurement method of Embodiment 1. The device includes: a distributed sensing module, an adaptive catenary module, a dynamic crossing distance calculation module, and a threshold warning module.

[0045] Specifically, the distributed sensing module is positioned near the crossing point of the two intersecting transmission lines to acquire distributed sensing data streams; the adaptive catenary module is used to establish an adaptive catenary model and dynamically update the adaptive catenary model based on the distributed sensing data streams; the dynamic crossing distance calculation module is used to establish a spatial model of the two intersecting transmission lines based on the updated adaptive catenary model and calculate the dynamic crossing distance between the two intersecting transmission lines; and the threshold warning module is used to set a basic safety distance threshold and issue a warning when the crossing distance is less than or equal to the basic safety distance threshold.

[0046] In one optional implementation, the distributed sensing module includes: a fiber Bragg grating strain sensor group, a micro-meteorological sensing terminal, and a drone. The fiber Bragg grating strain sensor group is respectively installed on two intersecting power transmission lines to acquire conductor strain data. The fiber Bragg grating strain sensor group includes multiple fiber Bragg grating strain sensors, and the distance between two adjacent fiber Bragg grating strain sensors on the same intersecting power transmission line is less than or equal to 10 meters. The micro-meteorological sensing terminal is installed on the top of the tower to acquire micro-meteorological sensing data, including wind speed vector, ambient temperature, relative humidity, and atmospheric pressure. The drone is used to acquire drone sensing data, which includes conductor spatial coordinates and temperature field distribution information.

[0047] For example, at the conductor level, micro-strain of the conductor is captured at a sampling rate of 100Hz using an embedded fiber optic strain sensor array, and then the axial stress change sensing data of the crossing transmission line is obtained through wave frequency offset analysis. A micro-meteorological sensing terminal is installed at the top of the tower, collecting wind speed vector data every 2 seconds. Ambient temperature relative humidity and atmospheric pressure The wind speed measurement accuracy can reach ±0.3m / s. The UAV is equipped with a dual-mode LiDAR and infrared payload and performs high-precision aerial surveys once a week (point cloud density >200 points / ㎡) to obtain the spatial coordinates and temperature field distribution of the crossing power transmission lines.

[0048] It is worth noting that the fiber optic strain sensor array and micro-meteorological sensing terminal can provide real-time feedback of strain and environmental data, while the UAV can provide a spatial reference. The distributed sensing module can acquire multi-dimensional sensing data, providing a basis for the dynamic updating of the adaptive catenary module. This solves the problems of poor environmental adaptability and lag in dynamic response of existing transmission line crossing distance measurement devices, and improves the calculation error of crossing distance.

[0049] It should be noted that the measuring device provided in Embodiment 2 of the present invention has similar beneficial effects to the measuring method in Embodiment 1. Therefore, for any undisclosed technical details, please refer to the description in Embodiment 1 for understanding.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that an article or device comprising a list of elements includes not only those elements but also other elements not expressly listed. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or device comprising said element. Terms such as "connected" or "linked" are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect. The orientations or positional relationships indicated by terms such as "upper," "lower," "left," and "right" are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0051] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A method for measuring the dynamic crossing distance of transmission lines, characterized in that, include: Acquire distributed sensing data streams, which include: conductor strain data, micro-meteorological sensing data, and UAV sensing data; An adaptive catenary model is established, and the adaptive catenary model is dynamically updated based on the distributed sensing data stream. Based on the updated adaptive catenary model, a spatial model of the two crossing transmission lines is established, and the dynamic crossing distance of the two crossing transmission lines is calculated.

2. The method for measuring the dynamic crossing distance of transmission lines according to claim 1, characterized in that, The expression for the adaptive catenary model is: ； in, The coordinates of the crossing transmission lines along the z-axis; This is the horizontal distance from the lowest suspension point; Initial load ratio; Strain-specific load factor; This represents the real-time axial strain. For strain ratio dynamic mapping; For wind-induced vibration coupling terms, This is the drag coefficient. This refers to the wind speed vector modulus; For time parameters; It is a hyperbolic cosine function; For temperature deformation, The coefficient of thermal expansion of the material. For temperature parameters, These are the initial temperature parameters.

3. The method for measuring the dynamic crossing distance of transmission lines according to claim 1, characterized in that, The spatial model expressions for the two crossing transmission lines are as follows: ； ； in, Let be the coordinates of the first crossing transmission line along the z-axis. The load ratio of the first crossing transmission line; The coordinates of the first crossing transmission line along the x-axis; The horizontal distance between the lowest suspension point and the lowest point of the first crossing transmission line; The coordinates of the first crossing transmission line along the y-axis; The sag at the low suspension point of the first crossing transmission line; Let be the coordinates of the second crossing transmission line along the z-axis. The load ratio of the second crossing transmission line; Let x be the coordinate of the second crossing transmission line along the x-axis. The coordinates of the second crossing transmission line along the y-axis; The sag at the low suspension point of the second crossing transmission line; The coordinates of the low suspension point of the second crossing transmission line along the x-axis. The horizontal distance between the low suspension point and the lowest point of the second crossing transmission line; The angle is the angle projected onto the ground. The coordinates of the low suspension point of the second crossing transmission line along the y-axis. It is a sine function; It is a cosine function; It is the tangent function.

4. The method for measuring the dynamic crossing distance of transmission lines according to claim 3, characterized in that, The static expression for the crossing distance between the two crossing transmission lines is: ； in, The dynamic crossing distance between the two crossing transmission lines; It is the cotangent function; Let be the coordinates of the low suspension point of the second crossing transmission line along the z-axis.

5. The method for measuring the dynamic crossing distance of transmission lines according to claim 4, characterized in that, The dynamic crossing distance between the two crossing transmission lines is calculated, including: The coordinates of the crossing points of the two crossing transmission lines are unified to the geodetic coordinate system; Dynamic buffer zones are established near the projection domains of the crossing points of the two crossing transmission lines, and discrete point sets of the two crossing transmission lines are extracted from the dynamic buffer zones respectively. Based on the discrete point set, multiple crossing distances are obtained through the static expression of the crossing distance between the two crossing transmission lines; Based on the multiple crossing distances, the minimum Euclidean distance is obtained through nearest neighbor search, where the minimum Euclidean distance is the dynamic crossing distance between the two crossing transmission lines.

6. The method for measuring the dynamic crossing distance of transmission lines according to claim 5, characterized in that, The minimum Euclidean distance The expression is: ； in, It is a minimum value function; The coordinates of the crossing point of the first intersecting transmission line; These are the coordinates of the crossing point of the second intersecting transmission line.

7. The method for measuring the dynamic crossing distance of transmission lines according to claim 6, characterized in that, After calculating the dynamic crossing distance of the two crossing transmission lines, the following steps are also included: A basic safety distance threshold is set, and an early warning is issued when the crossing distance is less than or equal to the basic safety distance threshold.

8. The method for measuring the dynamic crossing distance of transmission lines according to claim 7, characterized in that, The warning is a tiered warning system, including: Level 1 warning and Level 2 warning; when When this occurs, a Level 1 alert is triggered, and a text message is sent to the operations and maintenance personnel. when And if it lasts for at least 120 seconds, a second-level warning will be triggered, initiating a physical handling procedure for the transmission line; in, The basic safety distance threshold is defined as follows.

9. A device for measuring the dynamic crossing distance of transmission lines, characterized in that, The apparatus for implementing the dynamic crossing distance measurement method for transmission lines as described in any one of claims 1 to 8 includes: The distributed sensing module is located near the crossing point of two intersecting power transmission lines to acquire distributed sensing data streams. The adaptive catenary module is used to establish an adaptive catenary model and dynamically update the adaptive catenary model based on the distributed sensing data stream. The dynamic crossing distance calculation module is used to establish a spatial model of the two crossing transmission lines based on the updated adaptive catenary model, and calculate the dynamic crossing distance of the two crossing transmission lines. The threshold warning module is used to set a basic safety distance threshold and issue a warning when the crossing distance is less than or equal to the basic safety distance threshold.

10. The power transmission line dynamic crossing distance measuring device according to claim 9, characterized in that, The distributed sensing module includes: a fiber optic strain sensor array, a micro-meteorological sensing terminal, and a drone. The fiber optic strain sensor group is respectively installed on the two crossing transmission lines to acquire conductor strain data; the fiber optic strain sensor group includes multiple fiber optic strain sensors, and the distance between two adjacent fiber optic strain sensors on the same crossing transmission line is less than or equal to 10 meters. The micro-meteorological sensing terminal is installed on the top of the tower and is used to acquire micro-meteorological sensing data, which includes wind speed vector, ambient temperature, relative humidity and atmospheric pressure. The drone is used to acquire drone sensor data, which includes the spatial coordinates of the conductor and temperature field distribution information.

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