Overhead conductor sag remote measurement early warning method and system

Abstract

The invention discloses an overhead conductor sag remote measurement early warning method and system. The method comprises the steps that a sextant is installed at the vertex of the first end of an overhead conductor of two base towers, the sextant is remotely controlled through a main controller so as to measure the distance and angle from the vertex of the first end to the lowest point of the overhead conductor, and the sag of the overhead conductor is determined according to the distance and angle; and performing target identification on the image shot by the sextant, measuring the current distance between the overhead conductor and a tree by using the sextant when identifying that the tree exists below the overhead conductor, and determining the final elimination time of the hidden danger that the conductor is in contact with the tree according to the current distance and the identified tree characteristics. And giving out early warning based on the final elimination time. According to the scheme, measurement and early warning of the sag of the overhead conductor are realized.

Description

Technical Field

[0001] The invention belongs to the field of power transmission line design, and in particular relates to an overhead conductor sag remote measurement and early warning method and system. Background Art

[0002] The sag of overhead conductors is one of the important parameters in the design, operation and maintenance of transmission lines. The size of the sag directly affects the safe and stable operation of transmission lines. At present, the transmission line span measurement mainly uses theodolites or total stations, and the span is measured by approximate measurement methods. This method has the following main problems: high measurement conditions are required. At present, theodolites or total stations mainly use the span end method, the span outside method and the span inside method for sag measurement, which are greatly affected by the terrain and seriously affect the measurement efficiency; for complex terrain where the span end method cannot be measured, the span outside method and span inside method need to be used for measurement. The measurement and calculation methods are relatively complicated, time-consuming and labor-intensive, and inefficient. Summary of the invention

[0003] In order to solve the deficiencies in the prior art, the present invention provides a method and system for remotely measuring and warning the sag of an overhead conductor, so as to solve the technical problem of measuring and warning the sag of an overhead conductor.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0005] The present invention first discloses an overhead conductor sag remote measurement and early warning method, which comprises the following steps: Step 1: Install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through a main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire according to the distance and angle; Step 2: Perform target recognition on the image taken by the sextant. When a tree is identified under the overhead wire, use the sextant to measure the current distance between the overhead wire and the tree. According to the current distance and the identified tree characteristics, the final elimination time of the hidden danger of the wire contacting the tree is determined, and an early warning is issued based on the final elimination time.

[0006] The present invention further includes the following preferred embodiments: Determining the overhead conductor sag according to the distance and angle further includes: If the conductor is hung at the same height on two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end conductor with the vertex of the second end conductor, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the vertex of the first end to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the vertex of the first end and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sinα.

[0007] Determining the overhead conductor sag according to the distance and angle further includes: If the conductor is hung at different heights on the two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end of the conductor with the vertex of the second end of the conductor, adjust the second sight glass of the sextant to a horizontal position, measure the angle β, and calculate θ=90°-β; Adjust the first sight glass of the sextant to a horizontal position, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the first end vertex to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the first end vertex and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sin(α+β) / sinθ.

[0008] The step of determining the final elimination time of the hidden danger of the wire contacting the tree according to the current distance and the identified tree characteristics further comprises: Based on the recognized tree images, the tree species are intelligently identified. According to the pre-stored growth characteristics of the corresponding tree species in different seasons, the growth rate X of the tree in the current season is calculated. Combined with the minimum safe distance L between the overhead wire and the tree and the current closest distance λ, the final elimination time of the tree hidden danger under the wire is obtained as T=100×(L-λ) / X.

[0009] The issuing of an early warning based on the last elimination time further comprises: An early warning is issued more than ten days before the final elimination time.

[0010] The present invention also discloses an overhead conductor sag remote measurement and early warning system using the above-mentioned overhead conductor sag remote measurement and early warning method, comprising: A measuring module is used to install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through the main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire according to the distance and angle; The early warning module is used to perform target recognition on the image taken by the sextant. When a tree is recognized to exist under the overhead wire, the sextant is used to measure the current distance between the overhead wire and the tree, and the final elimination time of the hidden danger of the wire contacting the tree is determined according to the current distance and the recognized tree characteristics, and an early warning is issued based on the final elimination time.

[0011] Accordingly, the present application also discloses a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the aforementioned overhead wire sag remote measurement and early warning method.

[0012] Correspondingly, the present application also discloses a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the aforementioned overhead conductor sag remote measurement and early warning method are implemented.

[0013] The beneficial effect of the present invention is that, compared with the prior art, the present invention provides a method and system for remote measurement and early warning of sag of overhead conductors. The improved sextant is used to measure the sag of the ground conductor in real time in a remote manner without power outage, and the trees under the conductor and the minimum distance between other lines and the transmission line are measured and early warning is given. The invention is easy to operate and flexible in application. It avoids ground operations on foot and reduces the labor intensity of sag measurement. It is especially important for transmission sag measurement in sections with complex terrain, harsh geographical environment, bad weather, and not conducive to measurement under the conductor, such as mountains, rivers, and forests. It effectively solves the problems of difficult passage, tree obstruction that is not conducive to sag measurement, and inability to know the safe distance between the transmission conductor and the trees below or other crossing lines. At the same time, by intelligently identifying trees and judging the growth rate of trees, the safe distance is predicted in advance and early warning is given for hidden dangers of tree obstacles. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram of the overhead conductor sag remote measurement and early warning architecture in the present invention.

[0015] Figure 2 It is a schematic diagram of sag measurement at equal heights of the conductor hanging points in the present invention.

[0016] Figure 3 It is a partial enlarged view of the present invention.

[0017] Figure 4 It is a schematic diagram of measuring sag at unequal heights of conductor hanging points in the present invention.

[0018] Figure 5 It is a schematic diagram of measuring the distance of tree obstacle hidden danger in the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clear, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] The embodiments described in this application are only some embodiments of the present invention, not all embodiments. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the protection scope of the present invention.

[0021] In view of the shortcomings of the prior art, the present invention proposes a method and system for remote measurement and early warning of overhead conductor sag. By using an improved sextant, the sag of the ground wire can be measured remotely in real time without power outage, and the minimum distance between trees and other lines under the wire and the transmission line can be measured and early warning can be issued, thereby improving the work efficiency of transmission operation and maintenance personnel.

[0022] like Figure 1 The overhead conductor sag remote measurement and early warning architecture comprises a main controller, an angle measurement module, a direction control module, a distance measurement module, a power module, a communication module, a memory, an intelligent identification module, an early warning module and a display module. The main controller is respectively connected to the angle measurement module, the direction control module, the distance measurement module, the power module, the communication module, the early warning module, the intelligent identification module, the memory and the display module.

[0023] The direction control module is connected to the angle measurement module, and both are connected to the main controller. By adjusting the direction of the sextant, aiming at the target to be measured, and adjusting the first and second mirrors of the sextant, the angle between the targets can be measured. The second mirror of the sextant is a telescope with a distance measurement function, which can measure the distance of the target.

[0024] The present invention can realize real-time measurement of the sag of outdoor conductors and ground wires, and can intelligently identify and warn trees under the conductors and ground wires, so that power transmission operation and inspection personnel can quickly and dynamically grasp the safety distance information of the transmission line.

[0025] The overhead conductor sag remote measurement and early warning method disclosed in the present invention comprises the following steps: Step 1: Install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through a main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire based on the distance and angle.

[0026] See also Figure 3If the conductor is hung at the same height as the two pole towers, when measuring the sag, adjust the direction and angle of the sextant, align the first sextant mirror located at the vertex of the first end conductor with the vertex of the other end of the conductor, align the second sextant mirror and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the vertex of the first end to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the vertex of the first end and the lowest point of the conductor, and then calculate the sag of the overhead conductor as f=m×sinα. The sextant can be remotely controlled by the direction control module and adjusted by the communication module to align with the object to be measured, and the distance measurement function is added to the second mirror through the angle measurement module to achieve distance measurement, and the angle measurement is completed together with the first mirror.

[0027] See also Figure 4 If the conductor is hung at different heights on two towers, when measuring the sag, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end conductor with the vertex of the other end of the conductor, adjust the second sight glass of the sextant to a horizontal position, and measure the angle β, then θ=90°-β; adjust the first sight glass of the sextant to a horizontal position, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, and measure the angle α between the straight line from the vertex of the first end to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the vertex of the first end and the lowest point of the conductor. According to the relationship between the sides and angles of the triangle, it can be concluded that the conductor sag f=m×sin(α+β) / sinθ.

[0028] Step 2: Perform target recognition on the image taken by the sextant. When a tree is identified under the overhead wire, use the sextant to measure the current distance between the overhead wire and the tree. According to the current distance and the identified tree characteristics, determine the final elimination time of the hidden danger of the wire contacting the tree, and issue a warning based on the final elimination time of the hidden danger.

[0029] The intelligent recognition module accurately identifies the object to be tested by combining the objects observed in the first and second mirrors with the image recognition algorithm.

[0030] See also Figure 5 When the conductor is close to the trees below, a sextant is used to measure the distance between the conductor and the trees. Based on the growth rate of the trees, the deadline for eliminating hidden dangers between the conductor and the trees is predicted to remind the power transmission and maintenance personnel to eliminate the faults in time.

[0031] First, adjust the direction and angle of the sextant, aim the first sight glass of the sextant at the vertex of the wire at the lowest point of the wire, aim the second sight glass of the sextant at the highest point of the tree, measure the angle β and the distance between the vertex of one end of the wire and the highest point of the tree; approximate the closest distance λ=m×sinβ between the wire and the tree. Using intelligent algorithms, intelligently identify the tree species based on the image of the tree under the wire, calculate its growth rate X cm / day in the current season based on the pre-stored growth characteristics of the corresponding tree species in different seasons, and combine the minimum safe distance L between the overhead wire and the tree and the current closest distance λ to obtain the final elimination time of the hidden danger of the tree under the wire T=100×(L-λ) / X, and give an early warning more than ten days before the final elimination time of the hidden danger.

[0032] In a specific embodiment, the image recognition process further includes: Step 2.1: Image preprocessing.

[0033] First, the noise in the image is removed by filtering and other methods to improve the image clarity.

[0034] Resize the image to a size suitable for algorithm processing to reduce the amount of calculation.

[0035] Convert a color image to a grayscale image to reduce the complexity of the image while retaining sufficient feature information.

[0036] Normalize and adjust image parameters such as brightness and contrast to make image features more prominent.

[0037] Step 2.2: Extract representative feature information from the preprocessed image. These features can be pixel values, edges, textures, shapes, etc. Including: Edge detection: By detecting the edge information in the image, the contour features of the object (wires, branches, leaves, etc.) are extracted.

[0038] Corner detection: Identify corners in an image, which are usually important feature points in the image.

[0039] Texture analysis: Analyze the texture features in the image, such as texture direction, frequency, etc.

[0040] Color histogram: Statistics of the distribution of various colors in the image as color features.

[0041] Optionally, use advanced feature extraction methods such as SIFT (Scale Invariant Feature Transform), SURF (Speeded Up Robust Features), etc., which can extract more complex and stable features.

[0042] Step 2.3. Feature representation.

[0043] After feature extraction, the extracted features are quantified and represented in a form that can be processed by computers.

[0044] Step 2.4. Feature matching and classification.

[0045] By comparing the distance, similarity or relative position between the extracted features and the feature vectors of the known patterns, it is determined whether they represent the same object or scene.

[0046] Based on feature matching, classification algorithms are used to classify images, including decision trees, random forests, convolutional neural networks (CNNs), etc.

[0047] Step 2.5. Result output and post-processing.

[0048] According to the classification results, the recognition results are output to the user. Before the results are output, post-processing operations can also be performed, including removing misidentifications and optimizing recognition results.

[0049] The beneficial effect of the present invention is that, compared with the prior art, the present invention provides a method and system for remote measurement and early warning of sag of overhead conductors. The improved sextant is used to measure the sag of the ground conductor in real time in a remote manner without power outage, and the trees under the conductor and the minimum distance between other lines and the transmission line are measured and early warning is given. The invention is easy to operate and flexible in application. It avoids ground operations on foot and reduces the labor intensity of sag measurement. It is especially important for transmission sag measurement in sections with complex terrain, harsh geographical environment, bad weather, and not conducive to measurement under the conductor, such as mountains, rivers, and forests. It effectively solves the problems of difficult passage, tree obstruction that is not conducive to sag measurement, and inability to know the safe distance between the transmission conductor and the trees below or other crossing lines. At the same time, by intelligently identifying trees and judging the growth rate of trees, the safe distance is predicted in advance and early warning is given for hidden dangers of tree obstacles.

[0050] The present invention may be a system, a method and / or a computer program product. The present invention also discloses an overhead conductor sag remote measurement and early warning system based on the aforementioned overhead conductor sag remote measurement and early warning method, comprising: A measuring module is used to install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through the main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire according to the distance and angle; The early warning module is used to perform target recognition on the image taken by the sextant. When a tree is recognized to exist under the overhead wire, the sextant is used to measure the current distance between the overhead wire and the tree, and the final elimination time of the hidden danger of the wire contacting the tree is determined according to the current distance and the recognized tree characteristics, and an early warning is issued based on the final elimination time.

[0051] Based on the spirit of the present invention, those skilled in the art can easily think that a computer program product can be obtained based on the aforementioned overhead conductor sag remote measurement and early warning method. The computer program product may include a computer-readable storage medium, which carries computer-readable program instructions for enabling a processor to implement various aspects of the present disclosure. That is, the present application also includes a terminal, including a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the aforementioned overhead conductor sag remote measurement and early warning method.

[0052] Computer readable storage medium can be a tangible device that can keep and store the instructions used by the instruction execution device. Computer readable storage medium can be, for example, - but not limited to - electrical storage device, magnetic storage device, optical storage device, electromagnetic storage device, semiconductor storage device or any suitable combination of the above. More specific examples (non-exhaustive list) of computer readable storage medium include: portable computer disk, hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disk read-only memory (CD-ROM), digital versatile disk (DVD), memory stick, floppy disk, mechanical encoding device, such as punch card or groove protrusion structure with instructions stored thereon and any suitable combination of the above. Computer readable storage medium used here is not interpreted as instantaneous signal itself, such as radio wave or other free propagating electromagnetic wave, electromagnetic wave propagated by waveguide or other transmission medium (for example, light pulse by optical fiber cable) or electrical signal transmitted by wire.

[0053] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the computer-readable storage medium in each computing / processing device.

[0054] The computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider to connect through the Internet). In some embodiments, by using the state information of the computer-readable program instructions to personalize an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA) or a programmable logic array (PLA), the electronic circuit may execute the computer-readable program instructions, thereby implementing various aspects of the present disclosure.

[0055] Finally, it should be noted that the above 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 above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for remote measurement and early warning of overhead conductor sag, characterized in that: The following steps are involved: Step 1: Install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through a main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire according to the distance and angle; Step 2: Perform target recognition on the image taken by the sextant. When a tree is identified under the overhead wire, use the sextant to measure the current distance between the overhead wire and the tree. According to the current distance and the identified tree characteristics, the final elimination time of the hidden danger of the wire contacting the tree is determined, and an early warning is issued based on the final elimination time.

2. The method for remote measurement and early warning of overhead conductor sag according to claim 1 is characterized in that: Determining the overhead conductor sag according to the distance and angle further includes: If the conductor is hung at the same height on two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end conductor with the vertex of the second end conductor, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the vertex of the first end to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the vertex of the first end and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sinα.

3. The method for remote measurement and early warning of overhead conductor sag according to claim 2 is characterized in that: Determining the overhead conductor sag according to the distance and angle further includes: If the conductor is hung at different heights on the two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end of the conductor with the vertex of the second end of the conductor, adjust the second sight glass of the sextant to a horizontal position, measure the angle β, and calculate θ=90°-β; Adjust the first sight glass of the sextant to a horizontal position, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the first end vertex to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the first end vertex and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sin(α+β) / sinθ.

4. The method for remote measurement and early warning of overhead conductor sag according to claim 3 is characterized in that: The step of determining the final elimination time of the hidden danger of the wire contacting the tree according to the current distance and the identified tree characteristics further comprises: Based on the recognized tree images, the tree species are intelligently identified. According to the pre-stored growth characteristics of the corresponding tree species in different seasons, the growth rate X of the tree in the current season is calculated. Combined with the minimum safe distance L between the overhead wire and the tree and the current closest distance λ, the final elimination time of the tree hidden danger under the wire is obtained as T=100×(L-λ) / X.

5. The method for remote measurement and early warning of overhead conductor sag according to claim 4 is characterized in that: The issuing of an early warning based on the last elimination time further comprises: An early warning is issued more than ten days before the final elimination time.

6. An overhead conductor sag remote measurement and early warning system, characterized in that: include: A measuring module is used to install a sextant at the first end vertex of the overhead wire of the two towers, remotely control the sextant through the main controller to measure the distance and angle from the first end vertex to the lowest point of the overhead wire, and determine the sag of the overhead wire according to the distance and angle; The early warning module is used to perform target recognition on the image taken by the sextant. When a tree is recognized to exist under the overhead wire, the sextant is used to measure the current distance between the overhead wire and the tree, and the final elimination time of the hidden danger of the wire contacting the tree is determined according to the current distance and the recognized tree characteristics, and an early warning is issued based on the final elimination time.

7. The overhead conductor sag remote measurement and early warning system according to claim 6, characterized in that: The measuring module is further used for: If the conductor is hung at the same height on two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end conductor with the vertex of the second end conductor, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the vertex of the first end to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the vertex of the first end and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sinα.

8. The overhead conductor sag remote measurement and early warning system according to claim 7, characterized in that: The measuring module is further used for: If the conductor is hung at different heights on the two towers, adjust the direction and angle of the sextant, align the first sight glass of the sextant located at the vertex of the first end of the conductor with the vertex of the second end of the conductor, adjust the second sight glass of the sextant to a horizontal position, measure the angle β, and calculate θ=90°-β; Adjust the first sight glass of the sextant to a horizontal position, align the second sight glass of the sextant and the infrared rangefinder with the lowest point of the conductor, measure the angle α between the straight line from the first end vertex to the lowest point of the overhead conductor and the horizontal direction, and the distance m between the first end vertex and the lowest point of the conductor, and calculate the sag of the overhead conductor as f=m×sin(α+β) / sinθ.

9. The overhead conductor sag remote measurement and early warning system according to claim 8, characterized in that: The early warning module is further used for: Based on the recognized tree images, the tree species are intelligently identified. According to the pre-stored growth characteristics of the corresponding tree species in different seasons, the growth rate X of the tree in the current season is calculated. Combined with the minimum safe distance L between the overhead wire and the tree and the current closest distance λ, the final elimination time of the tree hidden danger under the wire is obtained as T=100×(L-λ) / X.

10. The overhead conductor sag remote measurement and early warning system according to claim 9, characterized in that: The early warning module is further used for: An early warning is issued more than ten days before the final elimination time.

11. A terminal comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is used to operate according to the instructions to execute the steps of the overhead wire sag remote measurement and early warning method according to any one of claims 1-5.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the overhead conductor sag remote measurement and early warning method described in any one of claims 1 to 5 are implemented.

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