A collaborative measurement method based on a distributed grounding terminal

Abstract

The application provides a collaborative measurement method based on a distributed grounding terminal, which comprises the following steps: arranging multiple grounding terminals at different grounding test points of a work area to form a grounding loop, and obtaining position information and initial grounding resistance values of the grounding terminals; selecting a main excitation terminal and a response collection terminal, controlling the main excitation terminal to inject a coded excitation signal carrying a preset identifier, and controlling the response collection terminal to collect a corresponding grounding loop response component; constructing a grounding loop response matrix according to the position information and the grounding loop response component; extracting abnormal elements based on the grounding loop response matrix, dividing data of the abnormal elements into removable abnormal data and non-removable abnormal data according to a source type of the abnormal elements; removing or reducing weights of the removable abnormal data, setting a safety reservation flag for the non-removable abnormal data, and combining the initial grounding resistance values to generate a collaborative grounding measurement result, thereby improving the reliability of collaborative grounding resistance measurement in a complex work area.

Description

Technical Field

[0001] This invention belongs to the field of grounding resistance detection technology, specifically relating to a collaborative measurement method based on distributed grounding terminals. Background Technology

[0002] In power outage maintenance, line construction, and substation maintenance, whether the grounding resistance meets safety requirements directly affects the safety of personnel and equipment. Current grounding resistance measurements typically employ the three-wire method, four-wire method, clamp meter method, or loop current method. Among these, the three-wire and four-wire methods require auxiliary electrodes and relatively long test leads. In complex environments such as urban roads, mountain lines, and substation interiors, these methods are easily affected by factors such as the work space, underground pipelines, soil moisture, metal components, and the location of the auxiliary electrodes, leading to complex on-site operations, low measurement efficiency, and insufficient stability of the measurement results.

[0003] With the development of intelligent grounding terminals, some grounding measurement devices have acquired the capabilities of grounding resistance measurement, positioning, communication, and data uploading, enabling them to upload grounding resistance values, terminal status, and location information to the backend system. However, existing solutions typically rely primarily on the measurement values ​​of a single grounding test point for judgment, or simply summarize and display the measurement data from multiple grounding terminals, lacking collaborative analysis of the grounding path response relationships between different grounding terminals.

[0004] In actual operating areas, when an abnormal value is measured at a grounding terminal, the source of the anomaly is not unique. For example, the anomaly may originate from actual poor grounding contact, an unclosed grounding loop, or abnormal local soil grounding conditions; it may also originate from abnormal terminal sampling, abnormal clamp contact, transient electromagnetic interference, or occasional noise. Existing technologies often struggle to distinguish these sources of anomaly, leading to two types of problems: first, external interference or terminal anomalies may be mistaken for actual grounding risks, affecting the overall measurement results; second, actual grounding safety anomalies may be discarded as ordinary outliers, or masked by low resistance values ​​from other normal grounding points during multi-point averaging and fusion.

[0005] Therefore, there is an urgent need for a technical solution that can improve the reliability of collaborative measurement of grounding resistance and the accuracy of grounding safety risk identification in complex operating areas. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a collaborative measurement method based on distributed grounding terminals. This method can improve the reliability of collaborative grounding resistance measurement and the accuracy of grounding safety risk identification in complex operating areas.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a collaborative measurement method based on distributed grounding terminals, comprising:

[0008] Multiple grounding terminals are deployed at different grounding test points in the work area to form a grounding loop, and the location information and initial grounding resistance value of each grounding terminal are obtained.

[0009] Select a main excitation terminal and a response acquisition terminal, control the main excitation terminal to inject an coded excitation signal carrying a preset identifier, and control the response acquisition terminal to acquire the corresponding grounding loop response component;

[0010] A grounding loop response matrix is ​​constructed based on the location information and the grounding loop response components.

[0011] Based on the grounding loop response matrix, abnormal elements are extracted, and according to the source type of the abnormal elements, the data of the abnormal elements are divided into removable abnormal data and non-removable abnormal data.

[0012] Eliminate or downweight removable abnormal data, set a safety retention flag for non-removable abnormal data, and generate collaborative grounding measurement results by combining the initial grounding resistance value.

[0013] Further, the control master excitation terminal injects an coded excitation signal carrying a preset identifier, including:

[0014] Based on the terminal information of the main excitation terminal, corresponding encoding parameters are generated, and an encoded excitation signal carrying a preset identifier is modulated based on the encoding parameters, so that the encoded excitation signals injected by different main excitation terminals have distinguishable frequency characteristics, phase characteristics or timing characteristics.

[0015] The response acquisition terminal demodulates the acquired signal based on the encoding parameters to extract the grounding loop response component that matches the corresponding main excitation terminal.

[0016] Furthermore, the control response acquisition terminal acquires the corresponding grounding loop response component, including:

[0017] Based on the injection time and duration of the coded excitation signal and the preset identifier, a collection time window and matching extraction conditions corresponding to the main excitation terminal are determined; multiple response collection terminals are controlled to collect response signals in their corresponding grounding loops within the collection time window; and the grounding loop response component corresponding to the main excitation terminal is separated from the response signal according to the matching extraction conditions.

[0018] Further, constructing a ground loop response matrix based on the location information and the ground loop response components includes:

[0019] Based on the location information of the main excitation terminal and each of the response acquisition terminals, the spatial association distance between the main excitation terminal and each of the response acquisition terminals is determined;

[0020] The expected response variation range of the corresponding grounding path is determined based on the spatial correlation distance;

[0021] Extract the actual response features from the grounding loop response components corresponding to each of the aforementioned response acquisition terminals;

[0022] Based on the degree of deviation between the actual response characteristics and the expected response change range, a path response characteristic value corresponding to the main excitation terminal and the response acquisition terminal is generated.

[0023] The path response feature values ​​between the main excitation terminal and each of the response acquisition terminals are arranged according to the terminal correspondence to form the grounding loop response matrix.

[0024] Further, generating the path response feature value corresponding to the main excitation terminal and the response acquisition terminal includes:

[0025] The actual response characteristics are compared with the expected response change range to obtain response deviation information of the actual response characteristics relative to the expected response change range;

[0026] The degree of grounding path coupling deviation between the corresponding main excitation terminal and the response acquisition terminal is determined based on the response deviation information.

[0027] The path response feature value is generated based on the degree of deviation of the grounding path coupling; the path response feature value is used to characterize the degree of deviation of the grounding path coupling state between the corresponding main excitation terminal and the response acquisition terminal from the normal grounding path coupling state.

[0028] Further, generating the path response feature value based on the degree of grounding path coupling deviation includes:

[0029] The actual response characteristics between the i-th master excitation terminal and the j-th response acquisition terminal are represented as follows: The expected response variation range corresponding to the actual response characteristics is expressed as: Calculate the response deviation information according to the following formula. :

[0030]

[0031] According to the response deviation information In addition to the response deviation information of adjacent grounding paths, the path response characteristic value is calculated according to the following formula. :

[0032]

[0033] in, This is the lower limit of the expected range of response variation. This is the upper limit of the expected range of response variation. For stability coefficient, Let j be the set of response acquisition terminals adjacent to the j-th response acquisition terminal. This is the spatial mutation correction coefficient;

[0034] The path response feature value It is also used to characterize the degree of deviation of the response of the corresponding grounding path from the degree of abrupt change relative to the adjacent grounding path.

[0035] Further, the extraction of abnormal elements based on the grounding loop response matrix includes:

[0036] Based on the grounding loop response matrix, the path response feature value corresponding to each matrix element is extracted, and the matrix element whose path response feature value is greater than the preset anomaly threshold is determined as a candidate anomaly element.

[0037] Based on the row and column distribution of the candidate abnormal elements in the grounding loop response matrix and the spatial distribution of the corresponding grounding terminals, the candidate abnormal elements are aggregated and filtered to obtain abnormal elements.

[0038] Further, the aggregation and filtering of the candidate anomalous elements to obtain anomalous elements includes:

[0039] When multiple candidate abnormal elements are concentrated in the same matrix row, the multiple candidate abnormal elements are classified into the same main excitation terminal abnormal set.

[0040] When multiple candidate anomaly elements are concentrated in the same matrix column, the multiple candidate anomaly elements are classified into the same response acquisition terminal anomaly set.

[0041] When the grounding terminals corresponding to multiple candidate abnormal elements are located in the same local area, the multiple candidate abnormal elements are classified into the same area abnormal set.

[0042] The abnormal element is generated based on the main excitation terminal abnormal set, the response acquisition terminal abnormal set, and the regional abnormal set.

[0043] Further, the step of dividing the data of the abnormal elements into removable abnormal data and non-removable abnormal data according to the source type of the abnormal elements includes:

[0044] Perform a retest verification on the abnormal elements to obtain the retest response matrix;

[0045] The retest response matrix is ​​compared with the grounding loop response matrix to determine the persistence state of the abnormal element before and after the retest.

[0046] When the abnormal element does not meet the persistence state before and after the retest, and the response component corresponding to the abnormal element does not match the encoded excitation signal, the abnormal element is classified as removable abnormal data caused by external interference.

[0047] When the abnormal element meets the continuous state before and after the retest, its source type is determined according to the distribution state of the abnormal element in the grounding loop response matrix and it is classified as non-removable abnormal data.

[0048] Furthermore, the setting of a security retention flag for non-removable abnormal data includes:

[0049] The source type of the non-removable abnormal data, the distribution status of the abnormal elements in the grounding loop response matrix, and the location information of the grounding terminal are associated, and a safety retention flag is generated based on the association result.

[0050] The safety retention flag is used to restrict the corresponding initial grounding resistance value from being excluded when generating the collaborative grounding measurement results, and to identify the grounding safety risk of the corresponding grounding test point or local grounding area.

[0051] Furthermore, the step of generating the coordinated grounding measurement result by combining the initial grounding resistance value includes:

[0052] Based on the initial grounding resistance value of the grounding terminal that was not eliminated and its corresponding fusion weight, the basic coordinated grounding measurement value is generated.

[0053] When the safety reservation flag is not present, the basic coordinated grounding measurement value shall be used as the coordinated grounding measurement result;

[0054] When the safety reservation flag is present, the basic coordinated grounding measurement value, the initial grounding resistance value with the safety reservation flag, the anomaly source type, and the grounding terminal location information are associated to generate a coordinated grounding measurement result.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] Unlike existing technologies, this invention does not independently judge the grounding resistance value of a single grounding test point, nor does it simply average and fuse the measured values ​​of multiple grounding terminals. Instead, it establishes the grounding path coupling relationship between different grounding terminals through coded excitation and response acquisition between the main excitation terminal and the response acquisition terminal, and further constructs a grounding loop response matrix. This grounding loop response matrix allows for the identification of abnormal elements from the response correlations between multiple grounding terminals. Based on the distribution and source type of the abnormal elements in the matrix, it distinguishes whether the anomaly is caused by measurement distortion factors such as external interference and terminal acquisition anomalies, or by real grounding safety risks such as abnormal grounding contact, unclosed grounding loops, or abnormal local grounding areas.

[0057] Therefore, for removable outlier data, this invention reduces its impact on the collaborative grounding measurement results by removing or downweighting it, thereby improving the stability and accuracy of the overall measurement results. For non-removable outlier data, this invention sets a safety retention flag, ensuring that such outlier data is not deleted as ordinary outlier data when generating collaborative grounding measurement results, and can be associated with the corresponding initial grounding resistance value, anomaly source type, and location information for output. This design suppresses the impact of occasional interference or terminal anomalies on grounding measurement results and prevents true grounding safety anomalies from being masked by average values ​​during multi-terminal fusion, thereby improving the reliability of collaborative grounding resistance measurement and the accuracy of grounding safety risk identification in complex operating areas. Attached Figure Description

[0058] Figure 1 This is a flowchart of a collaborative measurement method based on a distributed grounding terminal provided in an embodiment of the present invention. Detailed Implementation

[0059] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0060] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, 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.

[0061] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0062] like Figure 1As shown, the collaborative measurement method based on distributed grounding terminals provided in this embodiment includes:

[0063] Multiple grounding terminals are deployed at different grounding test points in the work area to form a grounding loop, and the location information and initial grounding resistance value of each grounding terminal are obtained.

[0064] Select a main excitation terminal and a response acquisition terminal, control the main excitation terminal to inject an coded excitation signal carrying a preset identifier, and control the response acquisition terminal to acquire the corresponding grounding loop response component;

[0065] A grounding loop response matrix is ​​constructed based on the location information and the grounding loop response components.

[0066] Based on the grounding loop response matrix, abnormal elements are extracted, and according to the source type of the abnormal elements, the data of the abnormal elements are divided into removable abnormal data and non-removable abnormal data.

[0067] Eliminable abnormal data is removed or downweighted, while non-eliminable abnormal data is marked for safe retention. The resulting coordinated grounding measurement is then generated by combining this data with the initial measured grounding resistance value.

[0068] As described above, by deploying multiple grounding terminals at different grounding test points within the work area and forming grounding loops, the traditional method of single-point grounding resistance measurement, which relies solely on a single test result, can be changed. This allows for a distributed measurement foundation where multiple grounding test points can mutually verify each other. By selecting a main excitation terminal to inject an coded excitation signal carrying a preset identifier, and having the response acquisition terminal collect the corresponding grounding loop response components, the grounding path coupling relationship between different grounding terminals can be effectively identified, thus avoiding confusion between the response signals of multiple terminals. Furthermore, by constructing a grounding loop response matrix using location information and grounding loop response components, the dispersed initial grounding resistance measurements can be transformed into a collaborative measurement data structure with spatial and response correlations, facilitating the identification of abnormal response sources. By dividing the data of abnormal elements into removable and non-removable abnormal data, and setting a safety retention flag for non-removable abnormal data, it is possible to prevent genuine grounding safety anomalies from being mistakenly removed during data fusion. This ensures that the final generated collaborative grounding measurement results have both high measurement reliability and retain grounding safety risk information, improving the accuracy and safety of on-site grounding status judgment.

[0069] In this embodiment, constructing a ground loop response matrix based on the location information and the ground loop response components includes:

[0070] Based on the location information of the main excitation terminal and each of the response acquisition terminals, the spatial association distance between the main excitation terminal and each of the response acquisition terminals is determined;

[0071] The expected response variation range of the corresponding grounding path is determined based on the spatial correlation distance;

[0072] Extract the actual response features from the grounding loop response components corresponding to each of the aforementioned response acquisition terminals;

[0073] Based on the degree of deviation between the actual response characteristics and the expected response change range, a path response characteristic value corresponding to the main excitation terminal and the response acquisition terminal is generated.

[0074] The path response feature values ​​between the main excitation terminal and each of the response acquisition terminals are arranged according to the terminal correspondence to form the grounding loop response matrix.

[0075] As described above, by determining the spatial correlation distance based on the location information of the main excitation terminal and the response acquisition terminal, and further determining the expected response change range of the corresponding grounding path based on this spatial correlation distance, the construction of the grounding loop response matrix can no longer be simply recording response data, but rather establishing a reference basis for the normal grounding path coupling state by combining spatial positional relationships. By extracting actual response features from the grounding loop response components and generating path response feature values ​​based on the deviation between the actual response features and the expected response change range, the grounding path state between each main excitation terminal and the response acquisition terminal can be quantitatively expressed. Therefore, the grounding loop response matrix can reflect the strength and abnormal deviation of the grounding path coupling relationship between different grounding terminals, providing a reliable data foundation for subsequent abnormal element extraction, abnormal source judgment, and correction of collaborative measurement results.

[0076] In this embodiment, generating the path response feature value between the corresponding main excitation terminal and the response acquisition terminal includes:

[0077] The actual response characteristics are compared with the expected response change range to obtain response deviation information of the actual response characteristics relative to the expected response change range;

[0078] The degree of grounding path coupling deviation between the corresponding main excitation terminal and the response acquisition terminal is determined based on the response deviation information.

[0079] The path response feature value is generated based on the degree of deviation of the grounding path coupling; the path response feature value is used to characterize the degree of deviation of the grounding path coupling state between the corresponding main excitation terminal and the response acquisition terminal from the normal grounding path coupling state.

[0080] As described above, by comparing the actual response characteristics with the expected response variation range, the deviation information of the actual grounding path response relative to the normal grounding path response can be obtained, avoiding the judgment of anomalies based solely on a single response amplitude or a single resistance value. Further determining the degree of grounding path coupling deviation between the main excitation terminal and the response acquisition terminal based on the response deviation information can more accurately reflect whether there is poor contact, abnormal coupling, abnormal local grounding conditions, or external interference affecting the path. By generating path response feature values ​​based on the degree of grounding path coupling deviation, the degree of anomaly in different grounding paths can be uniformly quantified, facilitating horizontal comparison and anomaly screening within the grounding loop response matrix, thus improving the accuracy and operability of anomaly identification.

[0081] In this embodiment, generating the path response feature value between the corresponding main excitation terminal and the response acquisition terminal includes:

[0082] The actual response characteristics between the i-th master excitation terminal and the j-th response acquisition terminal are represented as follows: The expected response variation range corresponding to the actual response characteristics is expressed as: Calculate the response deviation information according to the following formula. :

[0083]

[0084] According to the response deviation information In addition to the response deviation information of adjacent grounding paths, the path response characteristic value is calculated according to the following formula. :

[0085]

[0086] in, This is the lower limit of the expected range of response variation. This is the upper limit of the expected range of response variation. For stability coefficient, Let j be the set of response acquisition terminals adjacent to the j-th response acquisition terminal. This is the spatial mutation correction coefficient;

[0087] The path response feature value It is also used to measure the degree of deviation of the response of the corresponding grounding path from the degree of abrupt change relative to the adjacent grounding path.

[0088] As described above, by setting the calculation method for response deviation information and path response characteristic values, the deviation of actual response characteristics from the expected response change range can be transformed into a calculable deviation, providing a clear quantitative basis for judging grounding path anomalies. By further combining the response deviation information of adjacent grounding paths to calculate path response characteristic values, it is possible to determine whether the response deviation of a certain path exhibits a sudden change relative to surrounding paths, thereby distinguishing between overall regional changes and sudden anomalies in a single path. This method not only identifies the degree of anomaly within a specific grounding path but also, by combining the continuity of adjacent grounding paths, determines whether the anomaly has spatial abrupt change characteristics. This is beneficial for improving the ability to distinguish between grounding contact anomalies, terminal anomalies, or localized regional anomalies, and reducing the probability of misjudgment.

[0089] Specifically, in this embodiment, in order to quantify the degree of anomaly in the grounding path between the main excitation terminal and the response acquisition terminal, the actual response characteristics between the i-th main excitation terminal and the j-th response acquisition terminal are represented as follows: The expected response variation range corresponding to the actual response characteristic is expressed as: .in, This represents the lower limit of the expected range of response variation. This represents the upper limit of the expected response variation range. This expected response variation range can be determined based on the main stimulus. The spatial correlation distance between the terminal and the response acquisition terminal, the distribution of the initial grounding resistance values ​​of multiple grounding terminals in the same area, and the response change pattern under normal grounding path are determined.

[0090] Response deviation information :

[0091]

[0092] The stability coefficient;

[0093] Its practical meaning is: when the actual response characteristics Falling within the expected range of response variation At that time, and All are 0, at this time =0 indicates that the grounding path response is within the normal expected range; when the actual response characteristic is below the lower limit... or above the upper limit At that time, the formula will calculate the extent to which it exceeds the expected range and use... Normalization is performed to enable a unified comparison of the degree of deviation under different grounding paths, different response dimensions, or different response strengths.

[0094] According to the response deviation information In addition to the response deviation information of adjacent grounding paths, the path response characteristic value is calculated according to the following formula. :

[0095]

[0096] Let j be the set of response acquisition terminals adjacent to the j-th response acquisition terminal. This is the spatial mutation correction coefficient;

[0097] In this formula, the first term The first term indicates the degree of deviation in the response of the current grounding path itself; the second term indicates the degree of abrupt change in the current grounding path relative to adjacent grounding paths. Specifically, This represents the average response deviation of other response acquisition terminals adjacent to the j-th response acquisition terminal under the same main excitation terminal i. If the deviation of the current path... If the deviation is significantly greater than the average deviation of adjacent paths, it indicates that there is a local abrupt change in the grounding path, which may correspond to abnormal grounding contact, abnormal grounding terminal, or abnormal local grounding path. Therefore, the path response characteristic value is amplified by the second term. If the deviation of the current path is not higher than the average level of adjacent paths, the second term is 0, indicating that although the path may have a certain deviation, it does not show abrupt change characteristics relative to the surrounding paths.

[0098] Based on the above calculations, the path response characteristic value This not only reflects the degree of deviation in the response of a single path, but also further reflects whether the deviation has spatial abruptness. This avoids misjudgments caused by relying solely on single-point response characteristics. For example, when multiple paths simultaneously experience slight deviations due to changes in soil moisture or overall grounding conditions across the entire work area, the deviations between adjacent paths are relatively similar, and the spatial abruptness correction term will not be significantly amplified. However, when a grounding point has poor contact, a grounding terminal experiences abnormal data acquisition, or a path experiences partial discontinuity, the deviation of that path will be significantly higher than that of adjacent paths, thus... Enlarging the element makes it easier for subsequent steps to identify it as an abnormal element.

[0099] In this embodiment, instead of simply comparing the actual response value with a fixed threshold, it first calculates the normalized deviation based on the expected response variation range of the corresponding grounding path, and then introduces spatial abrupt change correction by combining the deviation of adjacent grounding paths. This allows the path response characteristic value to simultaneously serve two functions: self-deviation evaluation and neighborhood continuity evaluation. Therefore, it can more accurately distinguish between synchronization offsets caused by overall environmental changes, occasional anomalies caused by external interference, and local abrupt changes caused by grounding contact anomalies or local grounding area anomalies, thereby improving the accuracy of anomaly element extraction and anomaly source classification.

[0100] In this embodiment, the extraction of abnormal elements based on the grounding loop response matrix includes:

[0101] Based on the grounding loop response matrix, the path response feature value corresponding to each matrix element is extracted, and the matrix element whose path response feature value is greater than the preset anomaly threshold is determined as a candidate anomaly element.

[0102] Based on the row and column distribution of the candidate abnormal elements in the grounding loop response matrix and the spatial distribution of the corresponding grounding terminals, the candidate abnormal elements are aggregated and filtered to obtain abnormal elements.

[0103] As described above, by extracting the path response feature values ​​corresponding to each matrix element from the grounding loop response matrix and identifying matrix elements with path response feature values ​​greater than a preset anomaly threshold as candidate anomaly elements, preliminary screening of abnormal grounding path response relationships can be achieved. Further aggregation and screening based on the row and column distribution of candidate anomaly elements in the matrix and the spatial distribution of their corresponding grounding terminals can prevent isolated noise points or sporadic interference from being directly identified as anomalies, thereby improving the stability of anomaly element extraction. This scheme enables the anomaly identification process to simultaneously consider numerical anomalies and spatial / matrix distribution characteristics, providing a more accurate basis for subsequent judgment of anomaly source types.

[0104] In this embodiment, the candidate abnormal elements are aggregated and filtered to obtain abnormal elements, including:

[0105] When multiple candidate abnormal elements are concentrated in the same matrix row, the multiple candidate abnormal elements are classified into the same main excitation terminal abnormal set.

[0106] When multiple candidate anomaly elements are concentrated in the same matrix column, the multiple candidate anomaly elements are classified into the same response acquisition terminal anomaly set.

[0107] When the grounding terminals corresponding to multiple candidate abnormal elements are located in the same local area, the multiple candidate abnormal elements are classified into the same area abnormal set.

[0108] The abnormal element is generated based on the main excitation terminal abnormal set, the response acquisition terminal abnormal set, and the regional abnormal set.

[0109] As described above, by grouping candidate anomaly elements concentrated in the same matrix row into the same main excitation terminal anomaly set, it is possible to identify potential grounding contact anomalies, unclosed grounding loops, or other issues at the main excitation terminal or its corresponding grounding test point. Similarly, by grouping candidate anomaly elements concentrated in the same matrix column into the same response acquisition terminal anomaly set, it is possible to identify sampling anomalies, measurement channel anomalies, or terminal status anomalies within the response acquisition terminal itself. Furthermore, by grouping candidate anomaly elements located in the same local area into the same regional anomaly set, it is possible to identify overall grounding condition anomalies in the local grounding area. Therefore, candidate anomaly elements are no longer isolated data anomaly points, but can be categorized according to matrix rows, matrix columns, and spatial regions, providing a clear and structured basis for anomaly source determination.

[0110] In this embodiment, based on the source type of the abnormal elements, the data of the abnormal elements is divided into removable abnormal data and non-removable abnormal data, including:

[0111] Perform a retest verification on the abnormal elements to obtain the retest response matrix;

[0112] The retest response matrix is ​​compared with the grounding loop response matrix to determine the persistence state of the abnormal element before and after the retest.

[0113] When the abnormal element does not meet the persistence state before and after the retest, and the response component corresponding to the abnormal element does not match the encoded excitation signal, the abnormal element is classified as removable abnormal data caused by external interference.

[0114] When the abnormal element meets the continuous state before and after the retest, its source type is determined according to the distribution state of the abnormal element in the grounding loop response matrix and it is classified as non-removable abnormal data.

[0115] As described above, by performing retests on anomalous elements and comparing the retest response matrix with the original grounding loop response matrix, it can be determined whether the anomalous element persists before and after the retest, thus distinguishing between occasional interference and stability anomalies. When an anomalous element does not meet the persistence requirement and its response components do not match the coded excitation signal, it is classified as removable anomalous data caused by external interference, which can avoid the influence of transient electromagnetic interference or occasional noise on the final measurement results. When an anomalous element persists before and after the retest, its source type is determined based on its distribution in the grounding loop response matrix, and it is classified as non-removable anomalous data, which can retain anomalies that may reflect real grounding safety risks. This scheme can improve the accuracy of anomalous data diversion and avoid misjudging real grounding anomalies as ordinary measurement errors.

[0116] Specifically, when an abnormal element exists in both the grounding loop response matrix and the retest response matrix, and the corresponding main excitation terminal, response acquisition terminal, abnormal deviation direction, and path response characteristic value all meet preset consistency conditions, the abnormal element is determined to be in a persistent state. The preset consistency conditions may include:

[0117] The main excitation terminal and response acquisition terminal corresponding to the abnormal element are the same, or the corresponding grounding terminal is located in the same local area;

[0118] The path response characteristic value during the retest was still greater than the preset anomaly threshold.

[0119] The abnormal deviation direction during the retest was consistent with that of the first measurement, for example, both were manifested as lower response amplitude, increased phase delay, or reduced coding matching degree;

[0120] The difference in path response characteristic values ​​before and after the retest is less than the preset fluctuation threshold, or both fall within the abnormal level range.

[0121] In this embodiment, the persistence state is used to characterize the degree of stable occurrence of anomaly elements in multiple measurements. Specifically, when the same anomaly element is identified as anomaly in both the initial ground loop response matrix and the retest response matrix, and the main excitation terminal, response acquisition terminal, anomaly deviation direction, and path response characteristic value corresponding to the anomaly element meet preset consistency conditions, the anomaly element is determined to meet the persistence state. By setting the persistence state judgment, temporary anomalies caused by transient external electromagnetic interference or occasional noise can be distinguished from safety anomalies with stable physical sources, such as ground contact anomalies, ground loop unclosed anomalies, or local grounding area anomalies, thereby improving the accuracy of anomaly data classification.

[0122] In this embodiment, the control of the main excitation terminal to inject an coded excitation signal carrying a preset identifier includes:

[0123] Based on the terminal information of the main excitation terminal, corresponding encoding parameters are generated, and an encoded excitation signal carrying a preset identifier is modulated based on the encoding parameters, so that the encoded excitation signals injected by different main excitation terminals have distinguishable frequency characteristics, phase characteristics or timing characteristics.

[0124] The response acquisition terminal demodulates the acquired signal based on the encoding parameters to extract the grounding loop response component that matches the corresponding main excitation terminal.

[0125] As described above, by generating corresponding encoding parameters based on the terminal information of the main excitation terminal, and modulating an encoded excitation signal carrying a preset identifier based on the encoding parameters, the excitation signals injected by different main excitation terminals can have distinguishable frequency, phase, or timing characteristics. This allows for the differentiation of response sources corresponding to different main excitation terminals during collaborative measurements of multiple grounding terminals. The response acquisition terminal demodulates the acquired signal based on the encoding parameters, enabling the extraction of the grounding loop response component matching the corresponding main excitation terminal from the mixed response signal. This avoids response aliasing between different excitation sources and improves the accuracy of grounding loop response matrix construction. This design enhances the identifiability and anti-interference capability of multi-terminal collaborative measurements.

[0126] In this embodiment, the control response acquisition terminal acquires the corresponding grounding loop response component, including:

[0127] Based on the injection time and duration of the coded excitation signal and the preset identifier, a collection time window and matching extraction conditions corresponding to the main excitation terminal are determined; multiple response collection terminals are controlled to collect response signals in their corresponding grounding loops within the collection time window; and the grounding loop response component corresponding to the main excitation terminal is separated from the response signal according to the matching extraction conditions.

[0128] As described above, by determining the acquisition time window and matching extraction conditions based on the injection time, duration, and preset identifier of the coded excitation signal, the response acquisition terminal can acquire data within the effective time range corresponding to the main excitation terminal, reducing the influence of irrelevant signals and background interference. By acquiring the response signal in the corresponding grounding loop within the acquisition time window and separating the grounding loop response component corresponding to the main excitation terminal according to the matching extraction conditions, the relevance and accuracy of response component extraction can be improved. This scheme ensures that the matrix elements in the subsequent grounding loop response matrix truly reflect the grounding path coupling relationship between the main excitation terminal and the response acquisition terminal, thereby improving the reliability of the collaborative measurement results.

[0129] In this embodiment, setting a security retention flag for non-removable abnormal data includes:

[0130] The source type of the non-removable abnormal data, the distribution status of the abnormal elements in the grounding loop response matrix, and the location information of the grounding terminal are associated, and a safety retention flag is generated based on the association result.

[0131] The safety retention flag is used to restrict the corresponding initial grounding resistance value from being excluded when generating the collaborative grounding measurement results, and to identify the grounding safety risk of the corresponding grounding test point or local grounding area.

[0132] As described above, by associating the source type of the non-removable anomaly data, the distribution of the anomaly elements in the grounding loop response matrix, and the location information of the grounding terminal, and generating a safety retention flag based on the association result, anomaly data that may represent real grounding safety risks can be clearly distinguished from ordinary anomaly data. The safety retention flag is used to restrict the removal of the corresponding initial grounding resistance value when generating the collaborative grounding measurement results, preventing the accidental deletion of real grounding contact anomalies, grounding loop incomplete closure anomalies, or local grounding area anomalies during the fusion calculation. This scheme ensures that the collaborative grounding measurement results not only possess the stability after data fusion but also retain key safety risk information, improving the reliability of on-site grounding safety assessments.

[0133] In this embodiment, generating the coordinated grounding measurement result by combining the initial grounding resistance value includes:

[0134] Based on the initial grounding resistance value of the grounding terminal that was not eliminated and its corresponding fusion weight, the basic coordinated grounding measurement value is generated.

[0135] When the safety reservation flag is not present, the basic coordinated grounding measurement value shall be used as the coordinated grounding measurement result;

[0136] When the safety reservation flag is present, the basic coordinated grounding measurement value, the initial grounding resistance value with the safety reservation flag, the anomaly source type, and the grounding terminal location information are associated to generate a coordinated grounding measurement result.

[0137] As described above, by generating basic collaborative grounding measurement values ​​based on the initial grounding resistance values ​​of grounding terminals that have not been excluded and their corresponding fusion weights, more stable collaborative measurement results can be obtained while removing or reducing the influence of excluding abnormal data. When there is no safety retention flag, using the basic collaborative grounding measurement values ​​as the collaborative grounding measurement results simplifies the output of results under normal operating conditions. When there is a safety retention flag, associating the basic collaborative grounding measurement values, the initial grounding resistance values ​​with the safety retention flag, the anomaly source type, and the grounding terminal location information to generate collaborative grounding measurement results can avoid the final result being presented as only a fusion value, thus masking the true anomaly point. This scheme can simultaneously output overall collaborative measurement results and local safety anomaly information, enabling maintenance personnel to quickly locate abnormal grounding points or abnormal areas, improving the efficiency of grounding safety handling.

[0138] In one specific embodiment, when a safety retention flag is present, the cooperative grounding measurement result is composed of the basic cooperative grounding measurement value and the safety retention associated data. The system first performs a sorting process on the abnormal data according to the source type of the abnormal elements: for removable abnormal data caused by external transient interference, abnormal response acquisition terminal, etc., it is removed or downweighted; for non-removable abnormal data caused by abnormal grounding contact, abnormal grounding loop closure, or abnormal local grounding area, a safety retention flag is set to prevent it from being deleted as ordinary outlier data during the fusion process.

[0139] For example, six grounding terminals T1 to T6 are deployed in a certain work area, with initial measured grounding resistance values ​​of 11.8Ω, 12.5Ω, 12.2Ω, 47.9Ω, 13.0Ω, and 39.6Ω, respectively. The system, through grounding loop response matrix verification and retesting, determines that: the anomaly of T6 disappears after retesting, and its response component has a low degree of matching with the coded excitation signal. Therefore, the anomaly corresponding to T6 is classified as removable anomaly data caused by external transient interference, and its weight in fusion is reduced. The anomaly of T4 persists under the influence of different main excitation terminals, and its initial measured grounding resistance value is significantly higher than that of adjacent grounding terminals. Therefore, the anomaly corresponding to T4 is classified as non-removable anomaly data caused by grounding contact anomaly, and a safety retention flag is set for T4.

[0140] When generating the coordinated grounding measurement results, the system generates the basic coordinated grounding measurement value based on T1, T2, T3, T5, and T6 after weight reduction. For example, the basic coordinated grounding measurement value is 13.67Ω. Because T4 has a safety reservation flag, the system will not only output 13.67Ω as the final result, but will associate the basic coordinated grounding measurement value of 13.67Ω with the initial grounding resistance value of T4 of 47.9Ω, the anomaly source type "grounding contact anomaly", and the location information of T4 in the output.

[0141] When the initial grounding resistance value of T4 exceeds the preset safety threshold, the system will still generate a safety anomaly warning message even if the basic grounding measurement value is lower than the safety threshold. Therefore, the grounding measurement results can reflect the overall grounding status of the work area while also preserving the actual local grounding risks, preventing high-risk grounding points from being masked by the low resistance values ​​of other normal grounding points during the merging process.

[0142] A terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor executes the computer program to implement steps in a collaborative measurement method based on a distributed grounding terminal.

[0143] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0144] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0145] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0146] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0147] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A collaborative measurement method based on distributed grounding terminals, characterized in that, include: Multiple grounding terminals are deployed at different grounding test points in the work area to form a grounding loop, and the location information and initial grounding resistance value of each grounding terminal are obtained. Select a main excitation terminal and a response acquisition terminal, control the main excitation terminal to inject an coded excitation signal carrying a preset identifier, and control the response acquisition terminal to acquire the corresponding grounding loop response component; A grounding loop response matrix is ​​constructed based on the location information and the grounding loop response components. Based on the grounding loop response matrix, abnormal elements are extracted, and according to the source type of the abnormal elements, the data of the abnormal elements are divided into removable abnormal data and non-removable abnormal data. Eliminate or downweight removable abnormal data, set a safety retention flag for non-removable abnormal data, and generate collaborative grounding measurement results by combining the initial grounding resistance value.

2. The collaborative measurement method based on distributed grounding terminals according to claim 1, characterized in that, The control master excitation terminal injects an coded excitation signal carrying a preset identifier, including: Based on the terminal information of the main excitation terminal, corresponding encoding parameters are generated, and an encoded excitation signal carrying a preset identifier is modulated based on the encoding parameters, so that the encoded excitation signals injected by different main excitation terminals have distinguishable frequency characteristics, phase characteristics or timing characteristics. The response acquisition terminal demodulates the acquired signal based on the encoding parameters to extract the grounding loop response component that matches the corresponding main excitation terminal.

3. The collaborative measurement method based on distributed grounding terminals according to claim 1, characterized in that, The control response acquisition terminal acquires the corresponding grounding loop response components, including: Based on the injection time and duration of the coded excitation signal and the preset identifier, a collection time window and matching extraction conditions corresponding to the main excitation terminal are determined; multiple response collection terminals are controlled to collect response signals in their corresponding grounding loops within the collection time window; and the grounding loop response component corresponding to the main excitation terminal is separated from the response signal according to the matching extraction conditions.

4. The collaborative measurement method based on distributed grounding terminals according to claim 1, characterized in that, Constructing a grounding loop response matrix based on the location information and the grounding loop response components includes: Based on the location information of the main excitation terminal and each of the response acquisition terminals, the spatial association distance between the main excitation terminal and each of the response acquisition terminals is determined; The expected response variation range of the corresponding grounding path is determined based on the spatial correlation distance; Extract the actual response features from the grounding loop response components corresponding to each of the aforementioned response acquisition terminals; Based on the degree of deviation between the actual response characteristics and the expected response change range, a path response characteristic value corresponding to the main excitation terminal and the response acquisition terminal is generated. The path response feature values ​​between the main excitation terminal and each of the response acquisition terminals are arranged according to the terminal correspondence to form the grounding loop response matrix.

5. The collaborative measurement method based on distributed grounding terminals according to claim 4, characterized in that, The generation of path response feature values ​​corresponding to the main excitation terminal and the response acquisition terminal includes: The actual response characteristics are compared with the expected response change range to obtain response deviation information of the actual response characteristics relative to the expected response change range; The degree of grounding path coupling deviation between the corresponding main excitation terminal and the response acquisition terminal is determined based on the response deviation information. The path response feature value is generated based on the degree of deviation of the grounding path coupling; the path response feature value is used to characterize the degree of deviation of the grounding path coupling state between the corresponding main excitation terminal and the response acquisition terminal from the normal grounding path coupling state.

6. The collaborative measurement method based on distributed grounding terminals according to claim 5, characterized in that, The step of generating the path response feature value based on the degree of grounding path coupling deviation includes: The actual response characteristics between the i-th master excitation terminal and the j-th response acquisition terminal are represented as follows: The expected response variation range corresponding to the actual response characteristics is expressed as: Calculate the response deviation information according to the following formula. : According to the response deviation information In addition to the response deviation information of adjacent grounding paths, the path response characteristic value is calculated according to the following formula. : in, This is the lower limit of the expected range of response variation. This is the upper limit of the expected range of response variation. For stability coefficient, Let j be the set of response acquisition terminals adjacent to the j-th response acquisition terminal. This is the spatial mutation correction coefficient; The path response feature value It is also used to characterize the degree of deviation of the response of the corresponding grounding path from the degree of abrupt change relative to the adjacent grounding path.

7. The collaborative measurement method based on distributed grounding terminals according to claim 1, characterized in that, The extraction of abnormal elements based on the grounding loop response matrix includes: Based on the grounding loop response matrix, the path response feature value corresponding to each matrix element is extracted, and the matrix element whose path response feature value is greater than the preset anomaly threshold is determined as a candidate anomaly element. Based on the row and column distribution of the candidate abnormal elements in the grounding loop response matrix and the spatial distribution of the corresponding grounding terminals, the candidate abnormal elements are aggregated and filtered to obtain abnormal elements.

8. The collaborative measurement method based on distributed grounding terminals according to claim 7, characterized in that, The aggregation and filtering of the candidate abnormal elements to obtain abnormal elements includes: When multiple candidate abnormal elements are concentrated in the same matrix row, the multiple candidate abnormal elements are classified into the same main excitation terminal abnormal set. When multiple candidate anomaly elements are concentrated in the same matrix column, the multiple candidate anomaly elements are classified into the same response acquisition terminal anomaly set. When the grounding terminals corresponding to multiple candidate abnormal elements are located in the same local area, the multiple candidate abnormal elements are classified into the same area abnormal set. The abnormal element is generated based on the main excitation terminal abnormal set, the response acquisition terminal abnormal set, and the regional abnormal set.

9. The collaborative measurement method based on distributed grounding terminals according to claim 8, characterized in that, The step of dividing the abnormal element data into removable and non-removable abnormal data based on the source type of the abnormal element includes: Perform a retest verification on the abnormal elements to obtain the retest response matrix; The retest response matrix is ​​compared with the grounding loop response matrix to determine the persistence state of the abnormal element before and after the retest. When the abnormal element does not meet the persistence state before and after the retest, and the response component corresponding to the abnormal element does not match the encoded excitation signal, the abnormal element is classified as removable abnormal data caused by external interference. When the abnormal element meets the continuous state before and after the retest, its source type is determined according to the distribution state of the abnormal element in the grounding loop response matrix and it is classified as non-removable abnormal data.

10. The collaborative measurement method based on distributed grounding terminals according to claim 1, characterized in that, Setting a security retention flag for non-removable abnormal data includes: The source type of the non-removable abnormal data, the distribution status of the abnormal elements in the grounding loop response matrix, and the location information of the grounding terminal are associated, and a safety retention flag is generated based on the association result. The safety retention flag is used to restrict the corresponding initial grounding resistance value from being discarded when generating the coordinated grounding measurement results, and to identify the grounding safety risk of the corresponding grounding test point or local grounding area; The process of generating coordinated grounding measurement results by combining the initial grounding resistance value includes: Based on the initial grounding resistance value of the grounding terminal that was not eliminated and its corresponding fusion weight, the basic coordinated grounding measurement value is generated. When the safety reservation flag is not present, the basic coordinated grounding measurement value shall be used as the coordinated grounding measurement result; When the safety reservation flag is present, the basic coordinated grounding measurement value, the initial grounding resistance value with the safety reservation flag, the anomaly source type, and the grounding terminal location information are associated to generate a coordinated grounding measurement result.

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