A method, device, equipment and medium for detecting grounding state of a power transmission line

Abstract

The application discloses a power transmission line grounding state detection method, device, equipment and medium, and belongs to the power transmission line grounding state detection field. The method is as follows: two grounding state detectors are arranged at both ends of a power transmission line, a traveling wave pulse signal is respectively transmitted, and corresponding first wave and reflected wave signal data are collected; time first-order derivation is performed on the signal data, a maximum distortion point of a waveform is located, and the time and current polarity of each signal are determined; the polarity and time difference of the first wave and the reflected wave on one side are compared, the polarity results on both sides are comprehensively judged to determine whether a grounding point exists on the line, if the grounding point exists, the distance of the grounding point is calculated in combination with the time difference and a preset traveling wave velocity, and then the sum of the distances on both sides and the total length of the line are compared to determine the number and specific position of the grounding points. Therefore, by implementing the application, the problem of low patrol checking efficiency in the power transmission line grounding acceptance scene in the prior art can be solved.

Description

Technical Field

[0001] This application relates to the field of detecting the grounding status of transmission lines, and more particularly to a method, apparatus, equipment, and medium for detecting the grounding status of transmission lines. Background Technology

[0002] When performing maintenance work on overhead transmission lines during power outages, grounding wires must be installed on both sides of the work area and at both ends of the line. For induced voltage or near-live work scenarios, personal safety wires must also be installed. Before restoring power after maintenance, it must be confirmed that there are no remaining grounding wires or permanent grounding points on the line. If any grounding wires are missing and not removed, it can easily lead to serious accidents such as closing the circuit breaker with the grounded on, severely threatening the safety of power grid equipment and personnel. Therefore, conducting grounding status checks on transmission lines and quickly identifying any remaining grounding points are essential and crucial steps in the completion and acceptance of power outage maintenance, ensuring safe power restoration, and preventing serious electrical accidents in the power grid.

[0003] Currently, the verification of grounding status of transmission lines mainly relies on record-keeping and on-site inspections by maintenance personnel, supplemented by video surveillance for manual review of grounding points. This method depends entirely on subjective human experience and on-site point-by-point inspections. The manual inspection routes are long, the verification steps are numerous, and the detection efficiency is extremely low. Furthermore, manual on-site climbing and inspections along the line pose high safety risks, and can only qualitatively determine whether grounding exists, not pinpoint the location. Therefore, there is an urgent need for a technical solution that can address the low efficiency of inspection and verification in the current technology for transmission line grounding acceptance scenarios. Summary of the Invention

[0004] This application provides a method, apparatus, equipment, and medium for detecting the grounding status of transmission lines, which can solve the problem of low inspection and verification efficiency in the grounding acceptance scenario of transmission lines in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a method for detecting the grounding state of a transmission line, applicable to a grounding energized state detection device, wherein the grounding energized state detection device includes a first grounding state detector and a second grounding state detector, and the detection method includes: The first grounding state detector collects first initial wave signal data and first reflected wave signal data, and the second grounding state detector collects second initial wave signal data and second reflected wave signal data; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; The first wave time and first wave polarity are determined based on the first wave signal data, and the first reflected wave time and first reflected wave polarity are determined based on the first reflected wave signal data. The second first wave time and the second first wave polarity are determined based on the second first wave signal data, and the second reflected wave time and the second reflected wave polarity are determined based on the second reflected wave signal data; Based on the polarity of the first wave and the polarity of the first reflected wave, the first polarity result is determined, and based on the time of the first wave and the time of the first reflected wave, the first time difference is determined. Based on the polarity of the second initial wave and the polarity of the second reflected wave, the second polarity result is determined, and based on the time of the second initial wave and the time of the second reflected wave, the second time difference is determined; Based on the first polarity result and the second polarity result, it is determined whether there is a grounding point in the transmission line. If there is a grounding point, then based on the first time difference and the second time difference, several target grounding points in the transmission line and the positions of each target grounding point in the transmission line are determined.

[0006] This application embodiment establishes a distributed dual-sided detection architecture by deploying a first grounding status detector and a second grounding status detector at both ends of the transmission line, replacing the inefficient traditional method of manually inspecting sections of the line on foot for tens of kilometers. The two detectors actively transmit traveling wave pulse signals and simultaneously collect corresponding first-wave and reflected wave signal data, achieving automated data acquisition. By automatically analyzing the first-wave and reflected wave signal data, corresponding time and polarity parameters are obtained, and key information is extracted based on the inherent characteristics of the waveforms, eliminating the need for subjective human experience to identify the line status. By comparing the polarity of the first-wave and reflected waves, polarity results are obtained, and the time difference between the two is calculated, enabling rapid identification of the grounding status using quantified electrical characteristics. Finally, the dual-sided polarity results are combined to automatically determine whether a grounding point exists on the line. If so, the number and specific location of the grounding point are directly determined by combining the dual-sided time difference. The entire process requires no manual intervention for analysis and location, achieving full automation of the grounding acceptance process. This significantly shortens the grounding acceptance cycle after transmission line maintenance and fundamentally solves the problem of low inspection and verification efficiency in the grounding acceptance scenario of transmission lines in the prior art.

[0007] As a preferred example of the first aspect, determining whether a grounding point exists based on the first polarity result and the second polarity result includes: If the first polarity result is the same polarity and the second polarity result is the same polarity, then it is determined that the transmission line has a grounding point and the grounding state of the transmission line is abnormal. If the polarity result is opposite and the time difference is equal to the preset propagation time, it is determined that the transmission line has no grounding point and the grounding status of the transmission line is normal.

[0008] In this preferred example, by adopting a dual-polarity result collaborative judgment method, the misjudgment and omission caused by interference in single-sided detection are avoided, and the manual on-site verification step is eliminated. At the same time, by combining the dual quantitative criteria of polarity difference and preset propagation time, the grounding status can be automatically and accurately identified without relying on manual subjective experience to analyze waveforms, which greatly shortens the time for grounding status determination and effectively improves the overall efficiency of transmission line grounding acceptance.

[0009] As a preferred example of the first aspect, determining a plurality of target grounding points in the transmission line and the location of each target grounding point in the transmission line based on the first time difference and the second time difference includes: The first time difference is multiplied by the preset fixed propagation wave speed to obtain the first calculation result, and the first calculation result is divided by two to obtain the first line distance of the first target grounding point relative to the first grounding state detector. Multiply the second time difference with the preset fixed propagation wave speed to obtain the second calculation result, and divide the second calculation result by two to obtain the second line distance between the second target grounding point and the second grounding status detector. If the sum of the first line distance and the second line distance is equal to the line length of the transmission line, then it is determined that the first target grounding point and the second target grounding point are the same grounding point, and there is only one target grounding point. Then, the position of the target grounding point in the transmission line is determined according to the first line distance or the second line distance. If the sum of the first line distance and the second line distance is not equal to the line length of the transmission line, then the first target grounding point and the second target grounding point are determined to be different grounding points, and there are at least two target grounding points. Then, the position of the first target grounding point in the transmission line is determined according to the first line distance, and the position of the second target grounding point in the transmission line is determined according to the second line distance.

[0010] In this preferred example, the distance to the grounding point is calculated by combining the time difference on one side with the preset traveling wave velocity, achieving rapid and accurate location of the grounding point. Then, by comparing the sum of the distances on both sides with the total length of the transmission line, the number and corresponding location of the grounding points are automatically determined. This eliminates the need for manual segment-by-segment inspection and location along the line, saving a significant amount of time spent manually searching for grounding points and avoiding errors from manual location, effectively improving the efficiency and accuracy of transmission line grounding acceptance.

[0011] As a preferred example of the first aspect, determining the first wave time and the first wave polarity based on the first wave signal data includes: The first wave signal data is processed by taking the first derivative with respect to time to obtain the first wave derivative result, and the maximum distortion point of the first wave waveform in the first wave signal data is determined based on the first wave derivative result. The time corresponding to the maximum distortion point of the first wave waveform is taken as the first wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first wave waveform are extracted as the polarity of the first wave.

[0012] In this preferred example, the first-order derivative method is used to process the first-wave signal data, which can amplify the waveform distortion characteristics, accurately locate the maximum waveform distortion point, and effectively filter out electromagnetic interference and noise spikes on site. The moment of the maximum distortion point is taken as the first-wave time, and the corresponding current positive or negative is taken as the first-wave polarity, so as to realize the automatic and accurate extraction of the key parameters of the first wave. There is no need for manual identification of the waveform segment by segment, avoiding subjective judgment errors, greatly improving the efficiency and accuracy of parameter extraction, providing a reliable basis for the rapid identification of the subsequent grounding status, and further improving the overall efficiency of grounding acceptance.

[0013] As a preferred example of the first aspect, determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data includes: The first reflected wave signal data is subjected to the first derivative with respect to time to obtain the derivative result of the first reflected wave, and the maximum distortion point of the first reflected wave waveform in the first reflected wave signal data is determined based on the derivative result of the first reflected wave. The time corresponding to the maximum distortion point of the first reflected wave waveform is taken as the first reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first reflected wave waveform are extracted as the polarity of the first reflected wave.

[0014] As a preferred example of the first aspect, determining the second first wave time and the second first wave polarity based on the second first wave signal data includes: The second first wave signal data is processed by taking the first derivative with respect to time to obtain the second first wave derivative result, and the maximum distortion point of the second first wave waveform in the second first wave signal data is determined based on the second first wave derivative result; The time corresponding to the maximum distortion point of the second first wave waveform is taken as the time of the second first wave, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second first wave waveform are extracted as the polarity of the second first wave.

[0015] As a preferred example of the first aspect, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data includes: The second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the derivative result of the second reflected wave, and the maximum distortion point of the second reflected wave waveform in the second reflected wave signal data is determined based on the derivative result of the second reflected wave. The time corresponding to the maximum distortion point of the second reflected wave waveform is taken as the second reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second reflected wave waveform are extracted as the polarity of the second reflected wave.

[0016] Secondly, the present invention provides a detection device for the grounding status of transmission lines, which is applicable to grounding energized state detection equipment. The grounding energized state detection equipment includes a first grounding status detector and a second grounding status detector. The detection device includes a first detection module, a second detection module, a third detection module, a fourth detection module, a fifth detection module, and a sixth detection module. The first detection module is used to acquire first initial wave signal data and first reflected wave signal data through the first grounding state detector, and to acquire second initial wave signal data and second reflected wave signal data through the second grounding state detector; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; The second detection module is used to determine the first wave time and the first wave polarity based on the first wave signal data, and to determine the first reflection wave time and the first reflection wave polarity based on the first reflection wave signal data; The third detection module is used to determine the second first wave time and the second first wave polarity based on the second first wave signal data, and to determine the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data. The fourth detection module is used to determine the first polarity result based on the polarity of the first initial wave and the polarity of the first reflected wave, and to determine the first time difference based on the time of the first initial wave and the time of the first reflected wave. The fifth detection module is used to determine the second polarity result based on the polarity of the second initial wave and the polarity of the second reflected wave, and to determine the second time difference based on the time of the second initial wave and the time of the second reflected wave. The sixth detection module is used to determine whether there is a grounding point in the transmission line based on the first polarity result and the second polarity result. If there is a grounding point, it determines several target grounding points in the transmission line and the positions of each target grounding point in the transmission line based on the first time difference and the second time difference.

[0017] As a preferred example of the second aspect, determining whether a grounding point exists based on the first polarity result and the second polarity result includes: If the first polarity result is the same polarity and the second polarity result is the same polarity, then it is determined that the transmission line has a grounding point and the grounding state of the transmission line is abnormal. If the polarity result is opposite and the time difference is equal to the preset propagation time, it is determined that the transmission line has no grounding point and the grounding status of the transmission line is normal.

[0018] As a preferred example of the second aspect, determining a plurality of target grounding points in the transmission line and the location of each target grounding point in the transmission line based on the first time difference and the second time difference includes: The first time difference is multiplied by the preset fixed propagation wave speed to obtain the first calculation result, and the first calculation result is divided by two to obtain the first line distance of the first target grounding point relative to the first grounding state detector. Multiply the second time difference with the preset fixed propagation wave speed to obtain the second calculation result, and divide the second calculation result by two to obtain the second line distance between the second target grounding point and the second grounding status detector. If the sum of the first line distance and the second line distance is equal to the line length of the transmission line, then it is determined that the first target grounding point and the second target grounding point are the same grounding point, and there is only one target grounding point. Then, the position of the target grounding point in the transmission line is determined according to the first line distance or the second line distance. If the sum of the first line distance and the second line distance is not equal to the line length of the transmission line, then the first target grounding point and the second target grounding point are determined to be different grounding points, and there are at least two target grounding points. Then, the position of the first target grounding point in the transmission line is determined according to the first line distance, and the position of the second target grounding point in the transmission line is determined according to the second line distance.

[0019] As a preferred example of the second aspect, determining the first wave time and the first wave polarity based on the first wave signal data includes: The first wave signal data is processed by taking the first derivative with respect to time to obtain the first wave derivative result, and the maximum distortion point of the first wave waveform in the first wave signal data is determined based on the first wave derivative result. The time corresponding to the maximum distortion point of the first wave waveform is taken as the first wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first wave waveform are extracted as the polarity of the first wave.

[0020] As a preferred example of the second aspect, determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data includes: The first reflected wave signal data is subjected to the first derivative with respect to time to obtain the first reflected wave derivative result, and the maximum distortion point of the first reflected wave waveform in the first reflected wave signal data is determined based on the first reflected wave derivative result. The time corresponding to the maximum distortion point of the first reflected wave waveform is taken as the first reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first reflected wave waveform are extracted as the polarity of the first reflected wave.

[0021] As a preferred example of the second aspect, determining the second first wave time and the second first wave polarity based on the second first wave signal data includes: The second first wave signal data is processed by taking the first derivative with respect to time to obtain the second first wave derivative result, and the maximum distortion point of the second first wave waveform in the second first wave signal data is determined based on the second first wave derivative result; The time corresponding to the maximum distortion point of the second first wave waveform is taken as the time of the second first wave, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second first wave waveform are extracted as the polarity of the second first wave.

[0022] As a preferred example of the second aspect, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data includes: The second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the derivative result of the second reflected wave, and the maximum distortion point of the second reflected wave waveform in the second reflected wave signal data is determined based on the derivative result of the second reflected wave. The time corresponding to the maximum distortion point of the second reflected wave waveform is taken as the second reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second reflected wave waveform are extracted as the polarity of the second reflected wave.

[0023] In summary, this application's embodiment establishes a distributed dual-sided detection architecture by deploying a first grounding status detector and a second grounding status detector at both ends of the transmission line, replacing the inefficient traditional method of manually inspecting sections of the line on foot for tens of kilometers. The two detectors actively transmit traveling wave pulse signals and simultaneously collect corresponding first-wave and reflected wave signal data, achieving automated data acquisition. By automatically analyzing the first-wave and reflected wave signal data, corresponding time and polarity parameters are obtained, and key information is extracted based on the inherent characteristics of the waveforms, eliminating the need for subjective human experience to identify the line status. By comparing the polarity of the first-wave and reflected waves, polarity results are obtained, and the time difference between the two is calculated, enabling rapid identification of the grounding status using quantified electrical characteristics. Finally, by comprehensively analyzing the polarity results from both sides, the existence of a grounding point on the line is automatically determined. If a grounding point exists, its number and specific location are directly determined by combining the time difference between the two sides. The entire process requires no manual intervention for analysis and location, achieving full automation of the grounding acceptance process. This significantly shortens the grounding acceptance cycle after transmission line maintenance and fundamentally solves the problem of low inspection and verification efficiency in the grounding acceptance scenario of transmission lines in the prior art.

[0024] Another embodiment of this application also provides a terminal device, including: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the steps of the method for detecting the grounding status of transmission lines as described in this application.

[0025] Another embodiment of this application also provides a computer-readable storage medium item, including: a stored computer program, which, when the computer program is running, controls the device where the computer-readable storage medium is located to perform the steps of the transmission line grounding state detection method of this application. Attached Figure Description

[0026] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic flowchart of an embodiment of a method for detecting the grounding status of a power transmission line provided by the present invention. Figure 2 A schematic diagram of a transmission line grounding point, representing an embodiment of a method for detecting the grounding status of a transmission line provided by the present invention; Figure 3 The first current traveling wave signal diagram of the first grounding point detector when there is no grounding point, according to an embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 4 The second current traveling wave signal diagram of the second grounding point detector when there is no grounding point, according to one embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 5 The first current traveling wave signal diagram of the first grounding point detector when there is one grounding point, according to one embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 6 The second current traveling wave signal diagram of a second grounding point detector when there is one grounding point, according to one embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 7 The first current traveling wave signal diagram of the first grounding point detector when there are two grounding points, according to one embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 8 The second current traveling wave signal diagram of the second grounding point detector when there are two grounding points, according to one embodiment of the method for detecting the grounding state of a transmission line provided by the present invention; Figure 9 This is a module structure diagram of one embodiment of a power transmission line grounding status detection device provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0030] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0035] Example 1 Please refer to Figure 1 To address the problem of low inspection and verification efficiency in transmission line grounding acceptance scenarios in existing technologies, this application provides a method for detecting the grounding status of transmission lines, applicable to grounding energization detection equipment. The grounding energization detection equipment includes a first grounding status detector and a second grounding status detector. The detection method includes: S1. First initial wave signal data and first reflected wave signal data are collected by the first grounding state detector, and second initial wave signal data and second reflected wave signal data are collected by the second grounding state detector; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; Specifically, a first grounding status detector and a second grounding status detector are respectively deployed at both ends of the transmission line to establish a distributed dual-sided detection architecture. During detection, the first grounding status detector actively transmits a first traveling wave pulse signal to the transmission line under test, and simultaneously collects its own initial pulse signal as the first wave signal data. The first traveling wave pulse signal is transmitted along the conductor of the transmission line at a fixed wave speed. If there is a grounding point in the line during transmission, the pulse signal will undergo a sudden change in wave impedance at the grounding point and be reflected. If there is no grounding point in the line, the pulse signal will be transmitted to the second grounding status detector on the opposite side and reflected at its port. The reflected signal returns to the first grounding status detector along the original transmission path, and the first grounding status detector collects the returned signal as the first reflected wave signal data. Simultaneously, the second grounding status detector actively transmits a second traveling wave pulse signal to the transmission line under test, while simultaneously collecting its own initial pulse signal as the second first wave signal data. This second traveling wave pulse signal propagates along the transmission line and is reflected when it encounters a grounding point or the first grounding status detector on the opposite side. The reflected signal returns to the second grounding status detector, which then collects the second reflected wave signal data, thus completing the synchronous acquisition of signals from both sides and providing the original data basis for subsequent grounding status discrimination and grounding point location.

[0036] S2. Determine the first wave time and first wave polarity based on the first wave signal data, and determine the first reflection wave time and first reflection wave polarity based on the first reflection wave signal data; In some embodiments, determining the first wave time and the first wave polarity based on the first wave signal data includes: The first wave signal data is processed by taking the first derivative with respect to time to obtain the first wave derivative result, and the maximum distortion point of the first wave waveform in the first wave signal data is determined based on the first wave derivative result. The time corresponding to the maximum distortion point of the first wave waveform is taken as the first wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first wave waveform are extracted as the polarity of the first wave.

[0037] Specifically, determining the first wave time and first wave polarity based on the first wave signal data can be implemented through the following preferred scheme: The first wave signal data is subjected to a first-order derivative with respect to time to obtain the corresponding first wave derivative result. The first-order derivative processing can effectively amplify the distortion characteristics of the signal waveform, while filtering out noise interference and waveform spikes caused by the complex electromagnetic environment at the transmission line site, making the abrupt change points of the waveform clearer and more identifiable. Based on the obtained first wave derivative result, the point with the largest waveform change rate in the first wave signal data is located, which is the first wave waveform maximum distortion point. This point corresponds to the initial moment when the traveling wave pulse signal arrives at the detector. The time corresponding to this first wave waveform maximum distortion point is determined as the first wave time, and the positive and negative current attributes of the signal at this moment are extracted as the first wave polarity.

[0038] In some embodiments, determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data includes: The first reflected wave signal data is subjected to the first derivative with respect to time to obtain the first reflected wave derivative result, and the maximum distortion point of the first reflected wave waveform in the first reflected wave signal data is determined based on the first reflected wave derivative result. The time corresponding to the maximum distortion point of the first reflected wave waveform is taken as the first reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first reflected wave waveform are extracted as the polarity of the first reflected wave.

[0039] Specifically, determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data can be implemented through the following preferred scheme: Specifically, the first reflected wave signal data is processed by taking the first derivative with respect to time to obtain the corresponding first reflected wave derivative result. This processing can effectively amplify the waveform distortion characteristics of the reflected wave signal, while filtering out noise interference and waveform spikes generated by the complex electromagnetic environment at the transmission line site, making waveform abrupt changes that might have been obscured by noise clearly identifiable. Based on the obtained first reflected wave derivative result, the point with the largest waveform change rate in the first reflected wave signal data is located, which is the maximum distortion point of the first reflected wave waveform. This point accurately corresponds to the moment when the reflected wave signal returns to the first grounding status detector. The moment corresponding to this maximum distortion point of the first reflected wave waveform is determined as the first reflected wave time, and the positive and negative attributes of the current of the signal at this moment are extracted as the polarity of the first reflected wave.

[0040] S3. Determine the second first wave time and the second first wave polarity based on the second first wave signal data, and determine the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data; In some embodiments, determining the second first wave time and the second first wave polarity based on the second first wave signal data includes: The second first wave signal data is processed by taking the first derivative with respect to time to obtain the second first wave derivative result, and the maximum distortion point of the second first wave waveform in the second first wave signal data is determined based on the second first wave derivative result; The time corresponding to the maximum distortion point of the second first wave waveform is taken as the time of the second first wave, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second first wave waveform are extracted as the polarity of the second first wave.

[0041] Specifically, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data can be implemented through the following preferred schemes: The acquired second wave signal data is processed by taking the first derivative with respect to time to obtain the corresponding second wave derivative result. This processing can effectively amplify the waveform distortion characteristics of the second wave signal, while filtering out power frequency interference, high-frequency noise, and waveform spikes caused by the complex electromagnetic environment at the transmission line site, making waveform abrupt changes that might have been obscured by noise clearly identifiable. Based on the obtained second wave derivative result, the point with the largest waveform change rate in the second wave signal data is located, which is the maximum distortion point of the second wave waveform. This point accurately corresponds to the initial arrival time of the second traveling wave pulse signal emitted by the second grounding status detector. The time corresponding to this maximum distortion point of the second wave waveform is determined as the second wave time, and the positive and negative attributes of the current of the signal at this time are extracted as the polarity of the second wave.

[0042] In some embodiments, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data includes: The second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the derivative result of the second reflected wave, and the maximum distortion point of the second reflected wave waveform in the second reflected wave signal data is determined based on the derivative result of the second reflected wave. The time corresponding to the maximum distortion point of the second reflected wave waveform is taken as the second reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second reflected wave waveform are extracted as the polarity of the second reflected wave.

[0043] Specifically, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data can be implemented through the following preferred schemes: The acquired second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the corresponding derivative result of the second reflected wave. This processing can effectively amplify the waveform distortion characteristics of the second reflected wave signal, while filtering out power frequency interference, high-frequency noise, and waveform spikes caused by the complex electromagnetic environment at the transmission line site, making waveform abrupt changes that might have been obscured by background noise clearly identifiable. Based on the obtained derivative result of the second reflected wave, the point with the largest waveform change rate in the second reflected wave signal data is located, which is the point of maximum waveform distortion of the second reflected wave. This point accurately corresponds to the moment when the second traveling wave pulse signal is transmitted through the transmission line to the grounding point or the first grounding status detector on the opposite side and then reflected back to the second grounding status detector. The time corresponding to this point of maximum waveform distortion of the second reflected wave is determined as the second reflected wave time, and the positive and negative attributes of the current of the signal at this moment are extracted to serve as the polarity of the second reflected wave.

[0044] S4. Determine the first polarity result based on the polarity of the first initial wave and the polarity of the first reflected wave, and determine the first time difference based on the time of the first initial wave and the time of the first reflected wave; Specifically, determining the first polarity result based on the polarity of the first wave and the polarity of the first reflected wave can be implemented through the following preferred scheme: The polarity of the first wave is directly compared with the polarity of the first reflected wave, and the first polarity result is determined based on the reflection characteristics of traveling waves at different impedance interfaces. When there is a grounding point on the transmission line, the wave impedance at the grounding point is much smaller than the wave impedance of the transmission line itself. The polarity of the reflected wave generated after the first traveling wave pulse signal is incident on the grounding point is consistent with the polarity of the incident wave (i.e., the first wave). When there is no grounding point on the line, the first traveling wave pulse signal will be transmitted to the port of the second grounding status detector on the opposite side, where it will be reflected. At this time, the polarity of the reflected wave is opposite to that of the incident wave. By comparing whether the polarities of the two are consistent, the first polarity result can be obtained. This result serves as the initial judgment basis for single-sided detection. Subsequently, it will be verified in conjunction with the second polarity result obtained from the second grounding status detector to avoid misjudgment caused by factors such as electromagnetic interference and signal attenuation in single-sided detection.

[0045] Specifically, determining the first time difference based on the first wave time and the first reflected wave time can be implemented through the following preferred scheme: Subtracting the first wave time (determined by first-order differentiation) from the first reflected wave time yields the first time difference. This time difference corresponds to the total round-trip propagation time of the first traveling wave pulse signal emitted by the first grounding state detector, from its initial emission to its transmission through the transmission line to the reflection interface (grounding point or the port of the second grounding state detector on the opposite side), and then back to the first grounding state detector. Since the first and second grounding state detectors use a unified high-precision synchronous clock reference for signal acquisition, the synchronization and accuracy of the first wave and reflected wave time acquisition are ensured. Therefore, the calculated first time difference accurately reflects the actual propagation time of the traveling wave on the transmission line and is a core parameter for subsequently calculating the line distance between the grounding point and the first grounding state detector. Its calculation accuracy directly determines the accuracy of the grounding point location and also provides necessary basic time data for subsequent multi-grounding point identification and location determination based on the second time difference.

[0046] S5. Determine the second polarity result based on the polarity of the second initial wave and the polarity of the second reflected wave, and determine the second time difference based on the time of the second initial wave and the time of the second reflected wave; Specifically, the determination of the second polarity result based on the polarity of the second initial wave and the polarity of the second reflected wave can be implemented through the following preferred scheme: The polarity of the second initial wave, extracted using the first-order derivative method, is directly compared with the polarity of the second reflected wave. This comparison, combined with the inherent reflection characteristics of traveling waves at different impedance interfaces, determines the second polarity. When a grounding point exists on the transmission line, the impedance at the grounding point is much smaller than the impedance of the transmission line itself. When the second traveling wave pulse signal emitted by the second grounding state detector is incident on the grounding point, the polarity of the reflected wave will be consistent with the polarity of the incident wave, i.e., the second initial wave. However, when there is no grounding point on the line, the second traveling wave pulse signal will be transmitted completely to the port of the first grounding state detector on the opposite side, where it will be reflected. In this case, the polarity of the reflected wave will be opposite to the polarity of the incident wave. By directly comparing whether the polarities of the two are consistent, the second polarity result can be obtained. This result serves as an independent judgment basis for the detection on the opposite side. It will then be cross-validated with the first polarity result obtained from the first grounding state detector. This effectively avoids misjudgments and omissions caused by factors such as electromagnetic interference, signal attenuation, and local clutter in single-sided detection, providing a reliable two-end judgment basis for accurately determining whether a grounding point exists on the transmission line.

[0047] Specifically, determining the second time difference based on the second initial wave time and the second reflected wave time can be implemented through the following preferred scheme: Subtracting the second initial wave time, determined by the first-order derivative method for locating the maximum distortion point, from the second reflected wave time yields the second time difference. This time difference corresponds to the total round-trip propagation time of the second traveling wave pulse signal emitted by the second grounding state detector, from its initial emission to its transmission through the transmission line to the reflection interface (grounding point or the port of the first grounding state detector on the opposite side), and then back to the second grounding state detector along the original path. Since the first and second grounding state detectors use a unified high-precision synchronous clock reference for signal acquisition, the synchronization and millisecond-level accuracy of the second initial wave and second reflected wave time acquisition are ensured. Therefore, the calculated second time difference accurately reflects the actual propagation time of the traveling wave on the transmission line and is a core parameter for subsequently calculating the line distance between the grounding point and the second grounding state detector. Its calculation accuracy directly determines the accuracy of grounding point location and also provides necessary basic time data for subsequent multi-grounding point identification and location cross-verification using the first time difference.

[0048] S6. Based on the first polarity result and the second polarity result, determine whether there is a grounding point in the transmission line. If there is a grounding point, determine a number of target grounding points in the transmission line and the position of each target grounding point in the transmission line based on the first time difference and the second time difference.

[0049] In some embodiments, determining whether a grounding point exists based on the first polarity result and the second polarity result includes: If the first polarity result is the same polarity and the second polarity result is the same polarity, then it is determined that the transmission line has a grounding point and the grounding state of the transmission line is abnormal. If the polarity result is opposite and the time difference is equal to the preset propagation time, it is determined that the transmission line has no grounding point and the grounding status of the transmission line is normal.

[0050] In some embodiments, determining a plurality of target grounding points in the transmission line and the location of each target grounding point in the transmission line based on the first time difference and the second time difference includes: The first time difference is multiplied by the preset fixed propagation wave speed to obtain the first calculation result, and the first calculation result is divided by two to obtain the first line distance of the first target grounding point relative to the first grounding state detector. Multiply the second time difference with the preset fixed propagation wave speed to obtain the second calculation result, and divide the second calculation result by two to obtain the second line distance between the second target grounding point and the second grounding status detector. If the sum of the first line distance and the second line distance is equal to the line length of the transmission line, then it is determined that the first target grounding point and the second target grounding point are the same grounding point, and there is only one target grounding point. Then, the position of the target grounding point in the transmission line is determined according to the first line distance or the second line distance. If the sum of the first line distance and the second line distance is not equal to the line length of the transmission line, then the first target grounding point and the second target grounding point are determined to be different grounding points, and there are at least two target grounding points. Then, the position of the first target grounding point in the transmission line is determined according to the first line distance, and the position of the second target grounding point in the transmission line is determined according to the second line distance.

[0051] Specifically, to fully explain the details of step S6, the following scheme will be used as an example: A first grounding point detector and a second grounding point detector are respectively installed on both sides of the line. Two groundable points are set on the line, namely grounding point 1 and grounding point 2. Figure 1 As shown.

[0052] First, both grounding points are disconnected, meaning there are no grounding points on the line. At this point, the first current traveling wave signal (including the first initial wave signal data and the first reflected wave signal data) is as follows: Figure 2 As shown, the second current traveling wave signal (including the second first wave signal data and the second reflected wave signal data) is as follows: Figure 3 As shown. Figure 2 The polarity of the first distortion point in the subsequent section is opposite to that of the first distortion point. Furthermore, based on the time difference, L1 = (300 * 33.73) / 2 = 5059.5 meters, approximately equal to the total length of the line, which is 5050 meters. Meanwhile... Figure 3 The polarity of the first distortion point in the middle is opposite to that of the first distortion point. And by calculating the time difference, L2 = (300 * 33.73) / 2 = 5059.5 meters, which is approximately equal to the total length of the line, 5050 meters. Therefore, it can be determined that there are no remaining grounding points on the entire line.

[0053] Next, ensure a good connection to the grounding point 1 on the line, meaning there is a grounding point on the line. At this point, the first current traveling wave signal (including the first initial wave signal data and the first reflected wave signal data) will be as follows: Figure 4 As shown, the second current traveling wave signal (including the second first wave signal data and the second reflected wave signal data) is as follows: Figure 5 As shown. Figure 4 The polarity of the first distortion point in the subsequent process is the same as that of the first distortion point, and L3 is calculated as 300 * 20.34 / 2 = 3051 meters based on the time difference. Meanwhile... Figure 5The polarity of the first distortion point is the same as that of the first distortion point, and L4 is calculated as (300 * 13.5) / 2 = 2025 meters based on the time difference. Adding L4 and L3 together, we get L3 + L4 = 5076 meters, which is approximately equal to the total length of the line, meaning there is exactly one grounding point along the entire line.

[0054] Finally, both grounding point 1 and grounding point 2 are set to be well-connected lines, meaning there are two grounding points on the line. At this point, the first current traveling wave signal is as follows: Figure 6 As shown, the second current traveling wave signal is as follows: Figure 7 As shown. Figure 6 The polarity of the first distortion point in the subsequent process is the same as that of the first distortion point, and L5 is calculated as 300 * 20.34 / 2 = 3051 meters based on the time difference. Meanwhile... Figure 7 The polarity of the first distortion point is the same as that of the first distortion point, and the time difference is calculated to be L4 = (300 * 6.5) / 2 = 975 meters. The sum of these two is L5 + L6 = 4026 meters, which is less than the total length of the line, indicating that there are multiple grounding points along the entire line.

[0055] In summary, this application's embodiment establishes a distributed dual-sided detection architecture by deploying a first grounding status detector and a second grounding status detector at both ends of the transmission line, replacing the inefficient traditional method of manually inspecting sections of the line on foot for tens of kilometers. The two detectors actively transmit traveling wave pulse signals and simultaneously collect corresponding first-wave and reflected wave signal data, achieving automated data acquisition. By automatically analyzing the first-wave and reflected wave signal data, corresponding time and polarity parameters are obtained, and key information is extracted based on the inherent characteristics of the waveforms, eliminating the need for subjective human experience to identify the line status. By comparing the polarity of the first-wave and reflected waves, polarity results are obtained, and the time difference between the two is calculated, enabling rapid identification of the grounding status using quantified electrical characteristics. Finally, by comprehensively analyzing the polarity results from both sides, the existence of a grounding point on the line is automatically determined. If a grounding point exists, its number and specific location are directly determined by combining the time difference between the two sides. The entire process requires no manual intervention for analysis and location, achieving full automation of the grounding acceptance process. This significantly shortens the grounding acceptance cycle after transmission line maintenance and fundamentally solves the problem of low inspection and verification efficiency in the grounding acceptance scenario of transmission lines in the prior art.

[0056] Example 2 like Figure 9 As shown, based on the above method embodiments, corresponding device embodiments are provided; An embodiment of the present invention provides a detection device for the grounding state of a transmission line, which is applicable to grounding live state detection equipment. The grounding live state detection equipment includes a first grounding state detector and a second grounding state detector. The detection device includes a first detection module 91, a second detection module 92, a third detection module 93, a fourth detection module 94, a fifth detection module 95 and a sixth detection module 96. The first detection module 91 is used to collect first initial wave signal data and first reflected wave signal data through the first grounding state detector, and to collect second initial wave signal data and second reflected wave signal data through the second grounding state detector; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; The second detection module 92 is used to determine the first wave time and the first wave polarity based on the first wave signal data, and to determine the first reflection wave time and the first reflection wave polarity based on the first reflection wave signal data. The third detection module 93 is used to determine the second first wave time and the second first wave polarity based on the second first wave signal data, and to determine the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data. The fourth detection module 94 is used to determine the first polarity result based on the polarity of the first initial wave and the polarity of the first reflected wave, and to determine the first time difference based on the time of the first initial wave and the time of the first reflected wave. The fifth detection module 95 is used to determine the second polarity result based on the polarity of the second first wave and the polarity of the second reflected wave, and to determine the second time difference based on the time of the second first wave and the time of the second reflected wave; The sixth detection module 96 is used to determine whether there is a grounding point in the transmission line based on the first polarity result and the second polarity result. If there is a grounding point, it determines several target grounding points in the transmission line and the positions of each target grounding point in the transmission line based on the first time difference and the second time difference.

[0057] In some embodiments, determining whether a grounding point exists based on the first polarity result and the second polarity result includes: If the first polarity result is the same polarity and the second polarity result is the same polarity, then it is determined that the transmission line has a grounding point and the grounding state of the transmission line is abnormal. If the polarity result is opposite and the time difference is equal to the preset propagation time, it is determined that the transmission line has no grounding point and the grounding status of the transmission line is normal.

[0058] In some embodiments, determining a plurality of target grounding points in the transmission line and the location of each target grounding point in the transmission line based on the first time difference and the second time difference includes: The first time difference is multiplied by the preset fixed propagation wave speed to obtain the first calculation result, and the first calculation result is divided by two to obtain the first line distance of the first target grounding point relative to the first grounding state detector. Multiply the second time difference with the preset fixed propagation wave speed to obtain the second calculation result, and divide the second calculation result by two to obtain the second line distance between the second target grounding point and the second grounding status detector. If the sum of the first line distance and the second line distance is equal to the line length of the transmission line, then it is determined that the first target grounding point and the second target grounding point are the same grounding point, and there is only one target grounding point. Then, the position of the target grounding point in the transmission line is determined according to the first line distance or the second line distance. If the sum of the first line distance and the second line distance is not equal to the line length of the transmission line, then the first target grounding point and the second target grounding point are determined to be different grounding points, and there are at least two target grounding points. Then, the position of the first target grounding point in the transmission line is determined according to the first line distance, and the position of the second target grounding point in the transmission line is determined according to the second line distance.

[0059] In some embodiments, determining the first wave time and the first wave polarity based on the first wave signal data includes: The first wave signal data is processed by taking the first derivative with respect to time to obtain the first wave derivative result, and the maximum distortion point of the first wave waveform in the first wave signal data is determined based on the first wave derivative result. The time corresponding to the maximum distortion point of the first wave waveform is taken as the first wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first wave waveform are extracted as the polarity of the first wave.

[0060] In some embodiments, determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data includes: The first reflected wave signal data is subjected to the first derivative with respect to time to obtain the first reflected wave derivative result, and the maximum distortion point of the first reflected wave waveform in the first reflected wave signal data is determined based on the first reflected wave derivative result. The time corresponding to the maximum distortion point of the first reflected wave waveform is taken as the first reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first reflected wave waveform are extracted as the polarity of the first reflected wave.

[0061] In some embodiments, determining the second first wave time and the second first wave polarity based on the second first wave signal data includes: The second first wave signal data is processed by taking the first derivative with respect to time to obtain the second first wave derivative result, and the maximum distortion point of the second first wave waveform in the second first wave signal data is determined based on the second first wave derivative result; The time corresponding to the maximum distortion point of the second first wave waveform is taken as the time of the second first wave, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second first wave waveform are extracted as the polarity of the second first wave.

[0062] In some embodiments, determining the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data includes: The second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the derivative result of the second reflected wave, and the maximum distortion point of the second reflected wave waveform in the second reflected wave signal data is determined based on the derivative result of the second reflected wave. The time corresponding to the maximum distortion point of the second reflected wave waveform is taken as the second reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second reflected wave waveform are extracted as the polarity of the second reflected wave.

[0063] For more detailed steps and working principles of this embodiment, please refer to the relevant description in Embodiment 1, but not limited to these descriptions.

[0064] This application embodiment establishes a distributed dual-sided detection architecture by deploying a first grounding status detector and a second grounding status detector at both ends of the transmission line, replacing the inefficient traditional method of manually inspecting sections of the line on foot for tens of kilometers. The two detectors actively transmit traveling wave pulse signals and simultaneously collect corresponding first-wave and reflected wave signal data, achieving automated data acquisition. By automatically analyzing the first-wave and reflected wave signal data, corresponding time and polarity parameters are obtained, and key information is extracted based on the inherent characteristics of the waveforms, eliminating the need for subjective human experience to identify the line status. By comparing the polarity of the first-wave and reflected waves, polarity results are obtained, and the time difference between the two is calculated, enabling rapid identification of the grounding status using quantified electrical characteristics. Finally, the dual-sided polarity results are combined to automatically determine whether a grounding point exists on the line. If so, the number and specific location of the grounding point are directly determined by combining the dual-sided time difference. The entire process requires no manual intervention for analysis and location, achieving full automation of the grounding acceptance process. This significantly shortens the grounding acceptance cycle after transmission line maintenance and fundamentally solves the problem of low inspection and verification efficiency in the grounding acceptance scenario of transmission lines in the prior art.

[0065] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided in this application, the connection relationships between modules indicate that they have communication connections, which can specifically be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without any creative effort.

[0066] Example 3 Based on the above embodiments of the method for detecting the grounding status of transmission lines, another embodiment of this application provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the method for detecting the grounding status of transmission lines according to any embodiment of this application.

[0067] For example, in this embodiment, the computer program can be divided into one or more modules, which are stored in the memory and executed by the processor to complete this application. The one or more module units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the terminal device.

[0068] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0069] The processor 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. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0070] Example 4 Based on the above-described method embodiments, another embodiment of this application provides a computer-readable storage medium including a stored computer program, wherein, when the computer program is executed, it controls the device where the computer-readable storage medium is located to execute the transmission line grounding state detection method described in any of the above-described method embodiments of this application.

[0071] The modules / units integrated in the device / terminal equipment, if implemented as software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

Claims

1. A method for detecting the grounding status of a transmission line, characterized in that, Applicable to grounding live state detection equipment, the grounding live state detection equipment includes a first grounding state detector and a second grounding state detector, the detection method includes: The first grounding state detector collects first initial wave signal data and first reflected wave signal data, and the second grounding state detector collects second initial wave signal data and second reflected wave signal data; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; The first wave time and first wave polarity are determined based on the first wave signal data, and the first reflected wave time and first reflected wave polarity are determined based on the first reflected wave signal data. The second first wave time and the second first wave polarity are determined based on the second first wave signal data, and the second reflected wave time and the second reflected wave polarity are determined based on the second reflected wave signal data; Based on the polarity of the first wave and the polarity of the first reflected wave, the first polarity result is determined, and based on the time of the first wave and the time of the first reflected wave, the first time difference is determined. Based on the polarity of the second initial wave and the polarity of the second reflected wave, the second polarity result is determined, and based on the time of the second initial wave and the time of the second reflected wave, the second time difference is determined; Based on the first polarity result and the second polarity result, it is determined whether there is a grounding point in the transmission line. If there is a grounding point, based on the first time difference and the second time difference, several target grounding points in the transmission line and the positions of each target grounding point in the transmission line are determined.

2. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, The step of determining whether a grounding point exists based on the first polarity result and the second polarity result includes: If the first polarity result is the same polarity and the second polarity result is the same polarity, then it is determined that the transmission line has a grounding point and the grounding state of the transmission line is abnormal. If the polarity result is opposite and the time difference is equal to the preset propagation time, it is determined that the transmission line has no grounding point and the grounding status of the transmission line is normal.

3. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, The step of determining a plurality of target grounding points in the transmission line and the location of each target grounding point in the transmission line based on the first time difference and the second time difference includes: The first time difference is multiplied by the preset fixed propagation wave speed to obtain the first calculation result, and the first calculation result is divided by two to obtain the first line distance of the first target grounding point relative to the first grounding state detector. The second time difference is multiplied by the preset fixed propagation wave speed to obtain the second calculation result, and the second calculation result is divided by two to obtain the second line distance between the second target grounding point and the second grounding status detector. If the sum of the first line distance and the second line distance is equal to the line length of the transmission line, then it is determined that the first target grounding point and the second target grounding point are the same grounding point, and there is only one target grounding point. Then, the position of the target grounding point in the transmission line is determined according to the first line distance or the second line distance. If the sum of the first line distance and the second line distance is not equal to the line length of the transmission line, then the first target grounding point and the second target grounding point are determined to be different grounding points, and there are at least two target grounding points. Then, the position of the first target grounding point in the transmission line is determined according to the first line distance, and the position of the second target grounding point in the transmission line is determined according to the second line distance.

4. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, Determining the first wave time and first wave polarity based on the first wave signal data includes: The first wave signal data is processed by taking the first derivative with respect to time to obtain the first wave derivative result, and the maximum distortion point of the first wave waveform in the first wave signal data is determined based on the first wave derivative result. The time corresponding to the maximum distortion point of the first wave waveform is taken as the first wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first wave waveform are extracted as the polarity of the first wave.

5. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, Determining the first reflected wave time and the first reflected wave polarity based on the first reflected wave signal data includes: The first reflected wave signal data is subjected to the first derivative with respect to time to obtain the first reflected wave derivative result, and the maximum distortion point of the first reflected wave waveform in the first reflected wave signal data is determined based on the first reflected wave derivative result. The time corresponding to the maximum distortion point of the first reflected wave waveform is taken as the first reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the first reflected wave waveform are extracted as the polarity of the first reflected wave.

6. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, The step of determining the second first wave time and the second first wave polarity based on the second first wave signal data includes: The second first wave signal data is processed by taking the first derivative with respect to time to obtain the second first wave derivative result, and the maximum distortion point of the second first wave waveform in the second first wave signal data is determined based on the second first wave derivative result; The time corresponding to the maximum distortion point of the second first wave waveform is taken as the time of the second first wave, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second first wave waveform are extracted as the polarity of the second first wave.

7. The method for detecting the grounding status of a transmission line as described in claim 1, characterized in that, Determining the second reflected wave time and the second reflected wave polarity based on the second reflected wave signal data includes: The second reflected wave signal data is processed by taking the first derivative with respect to time to obtain the derivative result of the second reflected wave, and the maximum distortion point of the second reflected wave waveform in the second reflected wave signal data is determined based on the derivative result of the second reflected wave. The time corresponding to the maximum distortion point of the second reflected wave waveform is taken as the second reflected wave time, and the positive and negative attributes of the current at the time corresponding to the maximum distortion point of the second reflected wave waveform are extracted as the polarity of the second reflected wave.

8. A device for detecting the grounding status of a transmission line, characterized in that, This is applicable to grounding live state detection equipment, which includes a first grounding state detector and a second grounding state detector, and the detection device includes a first detection module, a second detection module, a third detection module, a fourth detection module, a fifth detection module, and a sixth detection module; The first detection module is used to acquire first initial wave signal data and first reflected wave signal data through the first grounding state detector, and to acquire second initial wave signal data and second reflected wave signal data through the second grounding state detector; wherein, the first reflected wave signal data is generated by the first grounding state detector transmitting a first traveling wave pulse signal through the transmission line to the second grounding state detector or grounding point and then reflecting it back, and the second reflected wave signal data is generated by the second grounding state detector transmitting a second traveling wave pulse signal through the transmission line to the first grounding state detector or grounding point and then reflecting it back; The second detection module is used to determine the first wave time and the first wave polarity based on the first wave signal data, and to determine the first reflection wave time and the first reflection wave polarity based on the first reflection wave signal data; The third detection module is used to determine the second first wave time and the second first wave polarity based on the second first wave signal data, and to determine the second reflection wave time and the second reflection wave polarity based on the second reflected wave signal data. The fourth detection module is used to determine the first polarity result based on the polarity of the first initial wave and the polarity of the first reflected wave, and to determine the first time difference based on the time of the first initial wave and the time of the first reflected wave. The fifth detection module is used to determine the second polarity result based on the polarity of the second initial wave and the polarity of the second reflected wave, and to determine the second time difference based on the time of the second initial wave and the time of the second reflected wave. The sixth detection module is used to determine whether there is a grounding point in the transmission line based on the first polarity result and the second polarity result. If there is a grounding point, it determines several target grounding points in the transmission line and the positions of each target grounding point in the transmission line based on the first time difference and the second time difference.

9. A terminal device, characterized in that, The method includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a method for detecting the grounding status of a transmission line as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the computer-readable storage medium to perform a method for detecting the grounding status of a transmission line as described in any one of claims 1 to 7.

Images