Non-contact current-carrying capacity evaluation method, system and device for overhead transmission line

Abstract

The invention discloses a non-contact current-carrying capacity evaluation method, system and device for an overhead transmission line, and particularly relates to the technical field of current-carrying capacity evaluation, and the technical key points are as follows: obtaining an ambient temperature average value of the overhead transmission line under a power frequency voltage; the method comprises the following steps: acquiring a transient current waveform and a magnetic induction intensity change curve of an overhead transmission line under double lightning stroke pulse current, and a transient voltage waveform of a tower close to a double lightning stroke pulse current injection position, and extracting two voltage peak values and four current peak values; carrying out decoupling calculation on the magnetic induction intensity change curve to obtain a transient current curve of the overhead transmission line, and obtaining amplitudes of the three transient current curves; acquiring line information of the overhead transmission line, and calculating to obtain a non-contact current-carrying capacity state evaluation factor of the transmission line; and performing current-carrying capacity state evaluation on the overhead transmission line by using the non-contact current-carrying capacity state evaluation factor of the transmission line to obtain a current-carrying capacity state evaluation result.

Description

Technical Field

[0001] This invention relates to the field of current carrying capacity assessment technology, specifically to a non-contact current carrying capacity assessment method, system, and device for overhead transmission lines. Background Technology

[0002] As the backbone of the power system, the safe and stable operation of transmission lines directly affects the reliable power supply of the grid. Current carrying capacity, a core parameter of transmission lines, is a key indicator for evaluating the economic and safe operation of these lines. Non-contact measurement of the current carrying capacity of overhead transmission lines, as a conventional method of line current measurement, is susceptible to interference from power frequency overvoltage and lightning overvoltage, affecting measurement accuracy. Lightning is a common phenomenon of thundercloud discharge, and statistics show that 80% of negative-polarity lightning strikes are multiple lightning pulses. Multiple lightning pulses are characterized by high current, high energy, and short intervals, not only posing a significant threat to the safe and stable operation of transmission lines, but also causing strong magnetic field interference that severely affects the accuracy of non-contact measurement of the current carrying capacity of overhead transmission lines, thus impacting the effectiveness of current carrying capacity status assessment. Therefore, researching non-contact current carrying capacity assessment methods for overhead transmission lines that consider multiple pulse interference is of great significance.

[0003] Currently, the current carrying capacity assessment of overhead transmission lines at home and abroad mainly relies on environmental climate monitoring, climate environment combined with conductor parameter status, equivalent heat transfer transient measurement, and non-contact measurement. However, there is no relevant research on non-contact current carrying capacity assessment methods for overhead transmission lines that consider multiple pulse interference. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing assessment methods do not consider multi-pulse interference, which seriously affects the accuracy of non-contact measurement of current carrying capacity of overhead transmission lines. The purpose is to provide a non-contact current carrying capacity assessment method, system, and device for overhead transmission lines. This method acquires the transient current waveforms of the two lightning conductors, the magnetic flux density variation curves on the three transmission lines, and the transient voltage waveform of the tower near the injection point of the double lightning pulse current. Simultaneously, assessment features are extracted from the transient current waveforms, magnetic flux density variation curves, and transient voltage waveforms to construct a non-contact current carrying capacity status assessment factor for the transmission line. This incorporates multi-pulse interference into the current carrying capacity assessment process, enabling non-contact current carrying capacity assessment of transmission lines under multi-pulse interference, thereby increasing assessment accuracy and laying an important foundation for improving the economy and safety of overhead transmission lines.

[0005] This invention is achieved through the following technical solution: A non-contact current-carrying capacity assessment method for overhead transmission lines, the method comprising: The ambient temperature of each tower of the overhead transmission line under power frequency voltage is obtained, and the average ambient temperature is calculated. The transient current waveforms of the two lightning protection wires, the magnetic induction intensity variation curves on the three transmission lines, and the transient voltage waveforms of the towers near the injection point of the double lightning pulse current were obtained under the condition of the overhead transmission line under the condition of the double lightning pulse current. Two voltage peaks and four current peaks are extracted from the transient voltage waveform and transient current waveform, respectively. The transient current curve of the overhead transmission line is obtained by decoupling the magnetic induction intensity change curve and obtaining the amplitude of the three transient current curves. By acquiring the line information of overhead transmission lines and combining it with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of three transient current curves, the non-contact current carrying capacity status assessment factor of the transmission line is calculated. The current carrying capacity status of overhead transmission lines is assessed using non-contact current carrying capacity status assessment factors, and the current carrying capacity status assessment results are obtained.

[0006] Furthermore, two voltage peaks and four current peaks were extracted from the transient voltage waveform and transient current waveform, respectively, as follows: Extract two voltage peaks from the transient voltage waveform; extract two current peaks from the transient current waveforms of the two lightning protection wires respectively.

[0007] Furthermore, by acquiring the line information of the overhead transmission line and combining it with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of three transient current curves, the non-contact current-carrying capacity assessment factor of the transmission line is calculated. The line information of the overhead transmission line includes the average height of the lightning protection wire to the ground, the horizontal spacing between transmission lines, the vertical spacing between the lightning protection wire and the transmission line, the tower span, the conductor radius of the transmission line, and the baseline value of the transmission line's current-carrying capacity, specifically: The multi-pulse interference characteristic factor is calculated by using the average height of the lightning protection wire to the ground, the horizontal spacing of the transmission line, the vertical spacing between the lightning protection wire and the transmission line, and the tower span, combined with the average ambient temperature, two voltage peaks, four current peaks, and the amplitude of three transient current curves. By using the conductor radius of the transmission line and the current carrying capacity benchmark value of the transmission line, combined with the multi-pulse interference characteristic factor, the non-contact current carrying capacity status assessment factor of the transmission line is calculated.

[0008] Furthermore, the specific calculation function for the non-contact current-carrying capacity condition assessment factor of transmission lines is as follows:

[0009] in, This represents the average ambient temperature. Indicates relative permeability; , , These represent the amplitudes of the three transient current curves, respectively. Indicates the horizontal spacing of power transmission lines; Indicates the permeability of free space; Indicates the conductor radius of the power transmission line; Indicates room temperature; Indicates the first Gaussian error coefficient; This represents the reference value for the current carrying capacity of a power transmission line; This represents the multipulse interference characteristic factor.

[0010] Furthermore, the specific function for calculating the multiple impulse interference characteristic factor is as follows:

[0011] in, Indicates the wavefront time of the multiple lightning strike pulse current waveform; This indicates the average height of the lightning protection wire above the ground; , , , All represent weighting factors; , These represent the peak voltage values ​​of the two transient voltage waveforms, respectively. Indicates the span of the tower; Indicates the second Gaussian error coefficient; , , , These represent the four current peaks in the two transient current waveforms; Indicates the horizontal spacing of the lightning protection wires; This indicates the vertical distance between the lightning protection wire and the power transmission line.

[0012] Furthermore, the non-contact current-carrying state assessment factor for transmission lines is used to assess the current-carrying state of overhead transmission lines, and the current-carrying state assessment results are as follows: When the non-contact current-carrying capacity assessment factor of the transmission line is not greater than the first threshold, the overhead transmission line is in a safe state. When the non-contact current carrying capacity condition assessment factor of the transmission line is greater than the first threshold and not greater than the second threshold, the overhead transmission line is in good condition. When the non-contact current carrying capacity status assessment factor of the transmission line is greater than the second threshold but not greater than the third threshold, the overhead transmission line is in a warning state. When the non-contact current carrying capacity assessment factor of a transmission line is greater than the third threshold, the overhead transmission line is in a dangerous state.

[0013] The present invention also provides a non-contact current-carrying capacity assessment system for overhead transmission lines, which is used in any of the above-described non-contact current-carrying capacity assessment methods for overhead transmission lines, the system comprising: The ambient temperature calculation module is used to obtain the ambient temperature of each tower of the overhead transmission line under power frequency voltage and calculate the average ambient temperature. The monitoring data acquisition module is used to acquire the transient current waveforms in multiple lightning protection wires of overhead transmission lines under multiple lightning pulse currents, the magnetic induction intensity change curves on multiple transmission lines, and the transient voltage waveforms of towers near the injection point of multiple lightning pulse currents. The evaluation feature extraction module is used to extract the voltage peak value and current peak value from the transient voltage waveform and transient current waveform, respectively, and to decouple the magnetic induction intensity change curve to obtain the transient current curve of the overhead transmission line and obtain the amplitude of the transient current curve. The evaluation factor calculation module is used to obtain the line information of overhead transmission lines, and calculate the non-contact current carrying capacity status evaluation factor of the transmission line by combining the average ambient temperature, peak voltage, peak current and amplitude of transient current curve. The current carrying capacity status assessment module is used to assess the current carrying capacity status of overhead transmission lines using non-contact current carrying capacity status assessment factors, and obtain the current carrying capacity status assessment results.

[0014] The present invention also provides a non-contact current carrying capacity assessment device for overhead transmission lines. The device is used in any of the above-described non-contact current carrying capacity assessment methods for overhead transmission lines. The device includes: a control processing module, which is connected to a data acquisition and transmission module, for receiving monitoring data transmitted by the data acquisition and transmission module, and for assessing the non-contact current carrying capacity of the overhead transmission line based on the monitoring data. A current monitoring module is installed on two lightning protection wires and three transmission lines in the overhead transmission line to collect the transient current waveform of each lightning protection wire and the magnetic induction intensity change curve of each transmission line. A voltage monitoring module is installed on a tower in an overhead transmission line near the location of a double lightning pulse current injection, and is used to collect the transient voltage waveform of the tower. A temperature monitoring module is installed on multiple towers in the overhead transmission line to collect ambient temperature data for each tower. The data acquisition and transmission module is connected to the control processing module, the current monitoring module, the voltage monitoring module, and the temperature monitoring module, respectively. It is used to receive the monitoring data collected by the current monitoring module, the voltage monitoring module, and the temperature monitoring module, and transmit the monitoring data to the control processing module.

[0015] The present invention also provides a computer device, including a system memory and a processor, wherein the system memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described above.

[0016] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the methods described above.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects: In this invention, by acquiring the transient current waveforms of the two lightning protection wires, the magnetic induction intensity variation curves on the three transmission lines, and the transient voltage waveform of the tower near the injection point of the double lightning pulse current, evaluation features are extracted from the transient current waveforms, magnetic induction intensity variation curves, and transient voltage waveforms to construct a non-contact current-carrying capacity assessment factor for the transmission line. This incorporates multiple pulse interference into the current-carrying capacity assessment process, enabling non-contact current-carrying capacity assessment of the transmission line under multiple pulse interference, thereby increasing the accuracy of the assessment and laying an important foundation for improving the economy and safety of overhead transmission lines. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a schematic diagram of the module connection of a non-contact current carrying capacity assessment device for overhead transmission lines in this embodiment; Figure 2 This is a schematic diagram of the process flow of a non-contact current carrying capacity assessment method for overhead transmission lines in this embodiment; Figure 3 This is a line example diagram of an overhead transmission line given in this embodiment; Figure 4 This is a schematic diagram of the module connection of a non-contact current carrying capacity assessment system for overhead transmission lines in this embodiment; Figure 5 This is a schematic diagram of the structure of a computer device in this embodiment. Detailed Implementation

[0019] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0020] In this disclosure, unless otherwise stated, the use of terms such as "first," "second," etc., to describe various elements is not intended to limit the positional, temporal, or importance relationships of these elements; such terms are merely used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of that element, while in other cases, based on the context, they may refer to different instances.

[0021] The terminology used in the description of the various examples in this disclosure is for the purpose of describing particular examples only and is not intended to be limiting. Unless the context explicitly indicates otherwise, an element may be one or more unless the number of elements is specifically limited. Furthermore, the term "and / or" as used in this disclosure covers any one of the listed items and all possible combinations thereof.

[0022] Example 1 In this embodiment, a non-contact current-carrying capacity assessment device for overhead transmission lines is provided. This device is used in the non-contact current-carrying capacity assessment method for overhead transmission lines described in this embodiment. See [link to relevant documentation]. Figure 1 , Figure 1 A schematic diagram of the module connection of a non-contact current-carrying capacity assessment device for overhead transmission lines is shown. The device includes a control processing module connected to a data acquisition and transmission module. The control processing module receives monitoring data transmitted by the data acquisition and transmission module and assesses the non-contact current-carrying capacity of the overhead transmission line based on the monitoring data. It should be noted that in this embodiment, the control processing module is a host computer, which can be a computer device or a mobile terminal. The mobile terminal can be a mobile phone, but in this embodiment it is not limited to a mobile phone. It can also be any mobile terminal that needs to perform communication and current-carrying capacity assessment, such as a tablet computer (PAD), portable communication device, etc. In addition, the computer device can be a desktop computer, but in this embodiment it is not limited to a desktop computer.

[0023] A current monitoring module is installed on two lightning protection wires and three transmission lines in the overhead transmission line. It is used to collect the transient current waveform of each lightning protection wire and the magnetic induction intensity change curve of each transmission line. It should be noted that in this embodiment, the current monitoring module uses five non-contact current monitoring devices. In other embodiments, other current monitoring devices may be used, and no further restrictions are imposed here.

[0024] A voltage monitoring module is installed on a tower in an overhead transmission line near the location of a double lightning pulse current injection point to collect the transient voltage waveform of the tower. It should be noted that in this embodiment, the voltage monitoring module adopts a weakly damped voltage sensing device. In other embodiments, other voltage monitoring devices may also be used, and no further restrictions are imposed here.

[0025] A temperature monitoring module is installed on multiple towers in the overhead transmission line to collect ambient temperature data for each tower. It should be noted that in this embodiment, the temperature monitoring module uses a wireless temperature sensing device, and the number of devices depends on the actual situation. In other embodiments, other temperature monitoring devices can also be used, and there are no major restrictions on storage.

[0026] The data acquisition and transmission module is connected to the control processing module, the current monitoring module, the voltage monitoring module, and the temperature monitoring module, respectively. It is used to receive the monitoring data collected by the current monitoring module, the voltage monitoring module, and the temperature monitoring module, and transmit the monitoring data to the control processing module.

[0027] See Figure 2 , Figure 2 A flowchart illustrating a non-contact current-carrying capacity assessment method for overhead transmission lines is shown, wherein the method includes: S1: Obtain the ambient temperature of each tower of the overhead transmission line under power frequency voltage, and calculate the average ambient temperature; Specifically, in this embodiment, the ambient temperature of each tower of the overhead transmission line under power frequency voltage is obtained through a temperature monitoring module, and the average ambient temperature is calculated. S2: Obtain the transient current waveforms of the two lightning protection wires, the magnetic induction intensity change curves on the three transmission lines, and the transient voltage waveforms of the towers near the injection point of the double lightning pulse current under the double lightning pulse current of the overhead transmission line. S3: Extract two voltage peaks and four current peaks from the transient voltage waveform and transient current waveform respectively, and decouple the magnetic induction intensity change curve to obtain the transient current curve of the overhead transmission line, and obtain the amplitude of the three transient current curves. Specifically, in this embodiment, the number of voltage peaks and the number of current peaks are the same as the number of pulses of the lightning strike pulse current. Therefore, two voltage peaks are extracted from the transient voltage waveform, and two current peaks are extracted from the transient current waveforms of the two lightning protection wires respectively.

[0028] S4: Obtain the line information of the overhead transmission line, and calculate the non-contact current carrying capacity status assessment factor of the transmission line by combining the average ambient temperature, two voltage peaks, four current peaks and the amplitude of three transient current curves. Specifically, in this embodiment, the line information of the overhead transmission line includes the average height of the lightning protection wire to the ground, the horizontal spacing of the transmission lines, the vertical spacing between the lightning protection wire and the transmission line, the span of the tower, the conductor radius of the transmission line, and the reference value of the current carrying capacity of the transmission line, specifically: Using the average height of the lightning protection wire to the ground, the horizontal spacing between transmission lines, the vertical spacing between the lightning protection wire and the transmission line, and the tower span, combined with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of three transient current curves, the multipulse interference characteristic factor is calculated; the specific calculation function for the multipulse interference characteristic factor is as follows:

[0029] in, Indicates the wavefront time of the multiple lightning strike pulse current waveform; This indicates the average height of the lightning protection wire above the ground; , , , All represent weighting factors. w 1+ w 2=1、 w 3+ w 4 = 1; , These represent the peak voltage values ​​of the two transient voltage waveforms, respectively. Indicates the span of the tower; Indicates the second Gaussian error coefficient; , , , These represent the four current peaks in the two transient current waveforms; Indicates the horizontal spacing of the lightning protection wires; This indicates the vertical distance between the lightning protection wire and the power transmission line.

[0030] Using the conductor radius and current-carrying capacity baseline of the transmission line, combined with the multi-pulse interference characteristic factor, the non-contact current-carrying capacity status assessment factor of the transmission line is calculated; the specific calculation function of the non-contact current-carrying capacity status assessment factor of the transmission line is as follows:

[0031] in, This represents the average ambient temperature. Indicates relative permeability; , , These represent the amplitudes of the three transient current curves, respectively. Indicates the horizontal spacing of power transmission lines; Indicates the permeability of free space; Indicates the conductor radius of the power transmission line; Indicates room temperature; Indicates the first Gaussian error coefficient; This represents the reference value for the current carrying capacity of a power transmission line; This represents the multipulse interference characteristic factor.

[0032] S5: Use the non-contact current carrying capacity status assessment factor of the transmission line to assess the current carrying capacity status of the overhead transmission line and obtain the current carrying capacity status assessment result.

[0033] Specifically, in this embodiment, when the non-contact current carrying capacity assessment factor of the transmission line is not greater than the first threshold, the overhead transmission line is in a safe state. It should be noted that in this embodiment, the first threshold value is -0.356. Other values ​​may be used in other embodiments, and no further restrictions are imposed here.

[0034] When the non-contact current carrying capacity condition assessment factor of the transmission line is greater than the first threshold and not greater than the second threshold, the overhead transmission line is in good condition. It should be noted that in this embodiment, the second threshold is -0.105. Other values ​​may be used in other embodiments, and no further restrictions are imposed here.

[0035] When the non-contact current carrying capacity status assessment factor of the transmission line is greater than the second threshold but not greater than the third threshold, the overhead transmission line is in an early warning state and the monitoring frequency needs to be increased. It should be noted that in this embodiment, the third threshold is 0.0953. Other values ​​may be used in other embodiments, and no restrictions are imposed here.

[0036] When the non-contact current carrying capacity assessment factor of a transmission line exceeds the third threshold, the overhead transmission line is in a dangerous state and needs to be reported to the dispatching department for immediate load adjustment.

[0037] For example, in this embodiment, see Figure 3The diagram shows an example of an overhead transmission line, using three towers, two lightning protection lines, and three transmission lines as an example. It is assumed that the double lightning pulse current injection point is located on the second tower. Voltage monitoring, temperature monitoring, and current monitoring modules are installed in this overhead transmission line to collect monitoring data. First, the ambient temperature of the three towers is collected. T g1 , T g2 , T g3 Then the average ambient temperature was calculated. T e =( T g1 + T g2 + T g3 Then, the transient current waveforms of the two lightning protection wires, the magnetic induction intensity variation curves on the three transmission lines, and the transient voltage waveform on the second tower are obtained. Two voltage peaks and four current peaks are extracted from the transient voltage and current waveforms, respectively. The transient current curve of the overhead transmission line is obtained by decoupling the magnetic induction intensity variation curve, and the amplitudes of the three transient current curves are obtained. Finally, the line information of the overhead transmission line is obtained, and combined with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of the three transient current curves, the non-contact current-carrying capacity assessment factor of the transmission line is calculated. Based on the non-contact current-carrying capacity assessment factor, the current-carrying capacity assessment of the overhead transmission line is performed, and the current-carrying capacity assessment result is obtained.

[0038] Specifically, in this embodiment, by acquiring the transient current waveforms of the two lightning protection wires, the magnetic induction intensity variation curves on the three transmission lines, and the transient voltage waveform of the tower near the injection point of the dual lightning pulse current, evaluation features are extracted from the transient current waveforms, magnetic induction intensity variation curves, and transient voltage waveforms to construct a non-contact current-carrying capacity assessment factor for the transmission line. This incorporates multiple pulse interference into the current-carrying capacity assessment process, enabling non-contact current-carrying capacity assessment of the transmission line under multiple pulse interference, thereby increasing the accuracy of the assessment and laying an important foundation for improving the economy and safety of overhead transmission lines.

[0039] Example 2 See Figure 4 The present invention also provides a non-contact current-carrying capacity assessment system for overhead transmission lines, which is used in the non-contact current-carrying capacity assessment method for overhead transmission lines described in any one of the above claims, the system comprising: The ambient temperature calculation module 100 is used to obtain the ambient temperature of each tower of the overhead transmission line under the power frequency voltage and calculate the average ambient temperature. The monitoring data acquisition module 200 is used to acquire the transient current waveforms in multiple lightning protection wires of overhead transmission lines under multiple lightning pulse currents, the magnetic induction intensity change curves on multiple transmission lines, and the transient voltage waveforms of towers near the injection location of multiple lightning pulse currents. The evaluation feature extraction module 300 is used to extract the voltage peak value and current peak value from the transient voltage waveform and transient current waveform respectively, and to decouple the magnetic induction intensity change curve to obtain the transient current curve of the overhead transmission line, and to obtain the amplitude of the transient current curve. The evaluation factor calculation module 400 is used to obtain the line information of the overhead transmission line, and calculate the non-contact current carrying capacity status evaluation factor of the transmission line by combining the average ambient temperature, peak voltage, peak current and amplitude of transient current curve. The current carrying capacity status assessment module 500 is used to assess the current carrying capacity status of overhead transmission lines using non-contact current carrying capacity status assessment factors, and obtain the current carrying capacity status assessment results.

[0040] It should be noted that the modules in the system of Embodiment 2 correspond to the steps in the method of Embodiment 1. The steps in the method of Embodiment 1 have been described in detail in Embodiment 1, and the module content in the system will not be described in detail in this Embodiment 2.

[0041] Example 3 See Figure 5 This embodiment also provides a computer device, including a system memory 1005 and a processor 1001. The system memory 1005 stores a computer program, and the processor 1001 executes the computer program to implement the steps of any of the methods described above.

[0042] It should be noted that the processor 1001 is used to execute the steps in the above method embodiments according to the instructions in the program code. Alternatively, when the processor 1001 executes the computer program, it implements the functions of each module / unit in the above system / device embodiments.

[0043] Specifically, in this embodiment, the computer program can be divided into one or more modules / units. One or more modules / units are stored in the system memory 1005 and executed by the processor 1001 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device.

[0044] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor 1001 and a system memory 1005. Those skilled in the art will understand that this does not constitute a limitation on the terminal device, which may include more or fewer components than shown, or a combination of certain components, or different components. For example, the terminal device may also include an input / output device 1003, a network access device 1002, a bus 1006, etc.

[0045] The processor 1001 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0046] System memory 1005 can be an internal storage unit of the terminal device, such as a hard drive or RAM. System memory 1005 can also be a storage device 1004 of the terminal device, such as an external hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or FlashCard. Furthermore, system memory 1005 can include both internal storage units and storage device 1004. System memory 1005 is used to store computer programs and other programs and data required by the terminal device. System memory 1005 can also be used to temporarily store data that has been output or will be output.

[0047] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0048] Example 4 This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0049] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), registers, hard disks, optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof, or any other form of computer-readable storage medium in the art.

[0050] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside within an application-specific integrated circuit (ASIC). In embodiments of the invention, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device.

[0051] Example 5 This embodiment also provides a computer program product containing instructions that, when executed by a cluster of computer devices, cause the cluster of computer devices to perform the method described in Embodiment 1.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A non-contact current-carrying capacity assessment method for overhead transmission lines, characterized in that, The methods include: The ambient temperature of each tower of the overhead transmission line under power frequency voltage is obtained, and the average ambient temperature is calculated. The transient current waveforms of the two lightning protection wires, the magnetic induction intensity variation curves on the three transmission lines, and the transient voltage waveforms of the towers near the injection point of the double lightning pulse current were obtained under the condition of the overhead transmission line under the condition of the double lightning pulse current. Two voltage peaks and four current peaks are extracted from the transient voltage waveform and transient current waveform, respectively. The transient current curve of the overhead transmission line is obtained by decoupling the magnetic induction intensity change curve and obtaining the amplitude of the three transient current curves. By acquiring the line information of overhead transmission lines and combining it with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of three transient current curves, the non-contact current carrying capacity status assessment factor of the transmission line is calculated. The current carrying capacity status of overhead transmission lines is assessed using non-contact current carrying capacity status assessment factors, and the current carrying capacity status assessment results are obtained.

2. The non-contact current-carrying capacity assessment method for overhead transmission lines according to claim 1, characterized in that, Two voltage peaks and four current peaks were extracted from the transient voltage waveform and transient current waveform, respectively. Specifically: Extract two voltage peaks from the transient voltage waveform; extract two current peaks from the transient current waveforms of the two lightning protection wires respectively.

3. The non-contact current-carrying capacity assessment method for overhead transmission lines according to claim 1, characterized in that, By acquiring the line information of overhead transmission lines and combining it with the average ambient temperature, two voltage peaks, four current peaks, and the amplitudes of three transient current curves, the non-contact current-carrying capacity assessment factor of the transmission lines is calculated. The line information of the overhead transmission lines includes the average height of the lightning protection wires to the ground, the horizontal spacing between transmission lines, the vertical spacing between the lightning protection wires and the transmission lines, the tower span, the conductor radius of the transmission lines, and the baseline value of the transmission line's current-carrying capacity. Specifically: The multi-pulse interference characteristic factor is calculated by using the average height of the lightning protection wire to the ground, the horizontal spacing of the transmission line, the vertical spacing between the lightning protection wire and the transmission line, and the tower span, combined with the average ambient temperature, two voltage peaks, four current peaks, and the amplitude of three transient current curves. By using the conductor radius of the transmission line and the current carrying capacity benchmark value of the transmission line, combined with the multi-pulse interference characteristic factor, the non-contact current carrying capacity status assessment factor of the transmission line is calculated.

4. A non-contact current-carrying capacity assessment method for overhead transmission lines according to claim 1 or 3, characterized in that, The specific calculation function for the non-contact current-carrying capacity condition assessment factor of transmission lines is as follows: in, This represents the average ambient temperature. Indicates relative permeability; , , These represent the amplitudes of the three transient current curves, respectively. Indicates the horizontal spacing of power transmission lines; Indicates the permeability of free space; Indicates the conductor radius of the power transmission line; Indicates room temperature; Indicates the first Gaussian error coefficient; This represents the reference value for the current carrying capacity of a power transmission line; This represents the multipulse interference characteristic factor.

5. The non-contact current-carrying capacity assessment method for overhead transmission lines according to claim 4, characterized in that, The specific function for calculating the multipulse interference characteristic factor is as follows: in, Indicates the wavefront time of the multiple lightning strike pulse current waveform; This indicates the average height of the lightning protection wire above the ground; , , , All represent weighting factors; , These represent the peak voltage values ​​of the two transient voltage waveforms, respectively. Indicates the span of the tower; Indicates the second Gaussian error coefficient; , , , These represent the four current peaks in the two transient current waveforms; Indicates the horizontal spacing of the lightning protection wires; This indicates the vertical distance between the lightning protection wire and the power transmission line.

6. The non-contact current-carrying capacity assessment method for overhead transmission lines according to claim 1, characterized in that, The current carrying capacity status of overhead transmission lines is assessed using non-contact current carrying capacity status assessment factors, and the current carrying capacity status assessment results are as follows: When the non-contact current-carrying capacity assessment factor of the transmission line is not greater than the first threshold, the overhead transmission line is in a safe state. When the non-contact current carrying capacity condition assessment factor of the transmission line is greater than the first threshold and not greater than the second threshold, the overhead transmission line is in good condition. When the non-contact current carrying capacity status assessment factor of the transmission line is greater than the second threshold but not greater than the third threshold, the overhead transmission line is in a warning state. When the non-contact current carrying capacity assessment factor of a transmission line is greater than the third threshold, the overhead transmission line is in a dangerous state.

7. A non-contact current-carrying capacity assessment system for overhead transmission lines, characterized in that, This system is used in the non-contact current-carrying capacity assessment method for overhead transmission lines according to any one of claims 1-6, wherein the system comprises: The ambient temperature calculation module is used to obtain the ambient temperature of each tower of the overhead transmission line under power frequency voltage and calculate the average ambient temperature. The monitoring data acquisition module is used to acquire the transient current waveforms of the two lightning protection wires, the magnetic induction intensity change curves on the three transmission lines, and the transient voltage waveforms of the towers near the injection point of the double lightning pulse current of the overhead transmission line. The evaluation feature extraction module is used to extract two voltage peaks and four current peaks from the transient voltage waveform and transient current waveform, respectively, and to decouple the magnetic induction intensity change curve to obtain the transient current curve of the overhead transmission line, and obtain the amplitude of the three transient current curves. The evaluation factor calculation module is used to obtain the line information of the overhead transmission line, and calculate the non-contact current carrying capacity status evaluation factor of the transmission line by combining the average ambient temperature, two voltage peaks, four current peaks and the amplitude of three transient current curves. The current carrying capacity status assessment module is used to assess the current carrying capacity status of overhead transmission lines using non-contact current carrying capacity status assessment factors, and obtain the current carrying capacity status assessment results.

8. A non-contact current-carrying capacity assessment device for overhead transmission lines, characterized in that, The device is used in the non-contact current carrying capacity assessment method for overhead transmission lines according to any one of claims 1-6. The device includes: a control processing module, which is connected to a data acquisition and transmission module, for receiving monitoring data transmitted by the data acquisition and transmission module, and for assessing the non-contact current carrying capacity of the overhead transmission line based on the monitoring data. A current monitoring module is installed on two lightning protection wires and three transmission lines in the overhead transmission line to collect the transient current waveform of each lightning protection wire and the magnetic induction intensity change curve of each transmission line. A voltage monitoring module is installed on a tower in an overhead transmission line near the location of a double lightning pulse current injection, and is used to collect the transient voltage waveform of the tower. A temperature monitoring module is installed on multiple towers in the overhead transmission line to collect ambient temperature data for each tower. The data acquisition and transmission module is connected to the control processing module, the current monitoring module, the voltage monitoring module, and the temperature monitoring module, respectively. It is used to receive the monitoring data collected by the current monitoring module, the voltage monitoring module, and the temperature monitoring module, and transmit the monitoring data to the control processing module.

9. A computer device comprising a system memory and a processor, wherein the system memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 6.

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