A method, system and computer device for testing a generator set device

Abstract

The present invention relates to the technical field of device testing, and specifically relates to a device testing method, system and computer device for a generator set, including: obtaining the conductivity and merged areas of each unit area; obtaining the current flow path between two current electrodes in the three-level method measurement and the current direction proximity factor of each merged area according to the conductivity difference between adjacent unit areas; and performing correction adjustment on the current direction proximity factor to obtain a corrected current direction proximity factor; obtaining the non-uniformity of the soil according to the conductivity differences of all merged areas; adjusting the overall conductivity of the grounding area calculated according to the corrected current direction proximity factor of each merged area and the non-uniformity of the soil to obtain the true grounding resistance; and completing the analysis and testing of the grounding device through the true grounding resistance. The present invention improves the accuracy of the grounding resistance measurement of the grounding device.

Description

Technical Field

[0001] The present invention relates to the technical field of device testing, and particularly to a method, system and computer device for testing generator set devices. Background Art

[0002] The method for testing generator set devices is mainly used to ensure that each component of the generator set can work normally under predetermined conditions, and to ensure the safety, stability and efficiency of the generator set. Among them, the testing of the grounding device is one of the tests for generator set devices.

[0003] The grounding device test is to ensure the normal operation of the grounding system of electrical equipment and systems, prevent safety problems caused by electrical equipment failures, protect personnel safety, and reduce equipment damage. The main function of the grounding device is to safely introduce current into the ground through the ground wire, reduce the failure risk of electrical equipment, and prevent electric shock accidents. Common grounding devices include grounding electrodes, grounding conductors, connection parts of the grounding device, etc.

[0004] When testing the grounding resistance of the grounding device, due to the interference of various influences, there is a large difference between the test result of the grounding resistance and the actual grounding resistance, which reduces the accuracy of the measurement of the grounding resistance of the grounding device. Summary of the Invention

[0005] The present invention provides a method, system and computer device for testing generator set devices, which are used to solve the problem of the accuracy of grounding resistance testing.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] In the first aspect of the present invention, a method for testing generator set devices is provided, including:

[0008] When using the three - electrode method to measure the area corresponding to the current electrode of the grounding resistance, it is recorded as the grounding area. The grounding area is divided into several unit areas, and the conductivity of each unit area is obtained;

[0009] According to the conductivity difference between adjacent unit areas, the current flow path between the two current electrodes in the three - electrode method measurement is obtained;

[0010] Merge the unit regions with similar conductivity to obtain several merged regions; according to the conductivity difference between each unit region and its adjacent unit regions, obtain the current conduction vector of each unit region, and according to the difference between the current conduction vectors of all unit regions within each merged region and the current conduction vectors of all unit regions in the current flow path, obtain the current direction proximity factor of each merged region; according to the area of each merged region and the length of the current flow path in each merged region, correct and adjust the current direction proximity factor of each merged region to obtain the corrected current direction proximity factor of each merged region;

[0011] Directly obtain the overall grounding resistance through the three-level method, and calculate the overall conductivity of the grounding area according to the relationship between conductivity and grounding resistance based on the overall grounding resistance; obtain the non-uniformity of the soil according to the conductivity differences of all merged regions; adjust the calculated overall conductivity of the grounding area according to the corrected current direction proximity factor of each merged region and the non-uniformity of the soil to obtain the true grounding resistance; complete the analysis and testing of the grounding device through the true grounding resistance.

[0012] Further, the dividing the grounding area into several unit regions and obtaining the conductivity of each unit region includes:

[0013] In the grounding area between two current electrodes, divide the grounding area evenly into several unit regions at a preset distance interval; where one unit region is a square region with the product of the preset distance multiplied by the preset distance ; obtain the conductivity of each unit region through a soil conductivity meter.

[0014] Further, the obtaining the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit regions includes:

[0015] Take the unit region corresponding to the out-current electrode when measuring the grounding resistance by the three-level method as the starting point, and take the unit region corresponding to the in-current electrode when measuring the grounding resistance by the three-level method as the end point; according to the starting point, the end point and the current diagram distance between adjacent two unit regions, use the Dijkstra algorithm to obtain the current flow path between the in-current electrode and the out-current electrode;

[0016] Obtain the eight unit regions adjacent to each unit region; where the eight unit regions adjacent to each unit region are two in the horizontal direction, two in the vertical direction, and four in the diagonal direction;

[0017] Record the eight unit regions adjacent to each unit region as the reference unit regions of each unit region;

[0018] Obtain the current flow degree from each unit area to the corresponding reference unit area according to the conductivity between two adjacent unit areas; the current flow degree is specifically expressed by the formula:

[0019]

[0020] In the formula, represents the conductivity of each unit area, represents the conductivity of the th reference unit area corresponding to each unit area, represents the current flow degree from each unit area to the th reference unit area corresponding thereto;

[0021] Obtain the current map distance through negative correlation mapping based on the current flow degree from each unit area to the corresponding reference unit area; the current map distance is specifically expressed by the formula:

[0022]

[0023] In the formula, represents the current flow degree from each unit area to the th reference unit area corresponding thereto, represents the current map distance from each unit area to the th reference unit area corresponding thereto, represents the exponential function with the natural constant as the base.

[0024] Furthermore, merging the unit areas with similar conductivities to obtain several merged areas, including:

[0025] Randomly select several unit areas and mark them as the seed points in the region growth process; according to the difference in conductivity between the selected seed points and the adjacent unit areas, perform region growth through the region growth algorithm to obtain several regions grown from the grounding area, denoted as several merged areas.

[0026] Furthermore, obtaining the current conduction vector of each unit area according to the conductivity difference between each unit area and its adjacent unit area, and obtaining the current direction proximity factor of each merged area according to the difference between the current conduction vectors of all unit areas in each merged area and the current conduction vectors of all unit areas in the current flow path, including:

[0027] Denote the unit region with the maximum conductivity among the eight unit regions adjacent to each unit region as the neighborhood maximum unit region. Based on each unit region and its neighborhood maximum unit region, obtain the current conduction vector for each unit region. Among them, the magnitude of the current conduction vector is the difference between the conductivity of the neighborhood maximum unit region and the conductivity of each unit region, and the direction of the current conduction vector is from the center point of each unit region to the center point of the neighborhood maximum unit region. Among them, map the magnitude of the current conduction vector to ; Among them, is the maximum parameter of the preset interval;

[0028] Perform a vector sum operation on the current conduction vectors of all unit regions in each merged region, and denote the vector after the operation as the total current conduction vector of each merged region. Then perform a vector sum operation on the current conduction vectors of all unit regions on the current flow path between the two current electrodes, and denote the vector after the operation as the path current conduction vector;

[0029] Obtain the current direction proximity factor for each merged region through the direction difference between the total current conduction vector and the path current conduction vector of each merged region. The current direction proximity factor is specifically expressed by the formula:

[0030]

[0031] In the formula, represents the direction angle between the total current conduction vector and the path current conduction vector of the th merged region, represents cosine value of, represents the th merged region's current direction proximity factor, represents the linear normalization function.

[0032] Furthermore, the step of correcting and adjusting the current direction proximity factor of each merged region according to the area of each merged region and the length of the current flow path in each merged region to obtain the corrected current direction proximity factor of each merged region includes:

[0033]

[0034] In the formula, represents the area of the th merged region, represents the length of the current flow path in the th merged region, represents the th merged region's current direction proximity factor, represents the The correction current direction proximity factor of a merged region; Represents a linear normalization function.

[0035] Further, based on the overall ground resistance, calculate the overall conductivity of the grounding area through the relationship between conductivity and ground resistance; obtain the non-uniformity of the soil based on the differences in the conductivities of all merged regions, including:

[0036] The non-uniformity is specifically expressed by the formula:

[0037]

[0038] In the formula, Represents the mean value of the conductivities of all unit regions in the th merged region, Represents the mean value of the conductivities of all unit regions in all merged regions, Is the absolute value symbol, Represents the non-uniformity of the soil;

[0039] The relationship between conductivity and ground resistance is specifically expressed by the formula:

[0040]

[0041] In the formula, Represents the overall ground resistance, Represents the calculated overall conductivity, Represents the length of the ground resistance, Is pi.

[0042] Further, based on the correction current direction proximity factor of each merged region and the non-uniformity of the soil, adjust the calculated overall conductivity of the grounding area to obtain the true ground resistance, including:

[0043]

[0044] In the formula, Represents the mean value of the conductivities of all unit regions in all merged regions, Represents the calculated overall conductivity, Represents the non-uniformity of the soil, Represents the mean value of the correction current direction proximity factors of all merged regions, Represents the length of the ground resistance, Represents a linear normalization function, Represents the true ground resistance, Is pi, Is the absolute value symbol, Represents the sign function used to determine the positive or negative sign.

[0045] The second aspect of the present invention is to provide a generator set device testing system, including:

[0046] A data acquisition module: used to measure the area corresponding to the current electrode when measuring the grounding resistance using the three - electrode method, denoted as the grounding area, divide the grounding area into several unit areas, and obtain the conductivity of each unit area;

[0047] A current path planning module: used to obtain the current flow path between two current electrodes in the three - electrode method according to the conductivity difference between adjacent unit areas;

[0048] A local area analysis module: used to merge unit areas with similar conductivities to obtain several merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and its adjacent unit areas, obtain the current direction proximity factor of each merged area according to the difference between the current guiding vectors of all unit areas within each merged area and the current guiding vectors of all unit areas in the current flow path; correct and adjust the current direction proximity factor of each merged area according to the area of each merged area and the length of the current flow path in each merged area to obtain the corrected current direction proximity factor of each merged area;

[0049] A safety test analysis module: used to directly obtain the overall grounding resistance through the three - electrode method, calculate the overall conductivity of the grounding area according to the relationship between conductivity and grounding resistance based on the overall grounding resistance; obtain the non - uniformity of the soil according to the conductivity differences of all merged areas; adjust the calculated overall conductivity of the grounding area according to the corrected current direction proximity factor of each merged area and the non - uniformity of the soil to obtain the true grounding resistance; complete the analysis and testing of the grounding device through the true grounding resistance.

[0050] The third aspect of the present invention is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above - mentioned generator set device testing method.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention divides the grounding area into several unit areas, uses local areas for analysis, and obtains the conductivity of each unit area; according to the conductivity difference between adjacent unit areas, obtains the current flow path between two current electrodes in the three-level method measurement, and determines the optimal path of the current flow; merges the unit areas with similar conductivity to obtain several merged areas; according to the conductivity difference between each unit area and its adjacent unit areas, obtains the current conduction vector of each unit area, and according to the difference between the current guiding vectors of all unit areas in each merged area and the current guiding vectors of all unit areas in the current flow path, obtains the current direction proximity factor of each merged area, improving the accuracy of the interference analysis of different merged areas on the current flow direction; according to the area of each merged area and the length of the current flow path in each merged area, corrects and adjusts the current direction proximity factor of each merged area to obtain the corrected current direction proximity factor of each merged area, improving the accuracy of the analysis of the influence degree of different merged areas on the current flow direction; directly obtains the overall grounding resistance through the three-level method, and according to the overall grounding resistance, calculates the overall conductivity of the grounding area through the relationship between conductivity and grounding resistance; obtains the non-uniformity of the soil according to the conductivity difference of all merged areas; according to the corrected current direction proximity factor of each merged area and the non-uniformity of the soil, adjusts the calculated overall conductivity of the grounding area to obtain the true grounding resistance, improving the accuracy of the grounding resistance measurement of the grounding device; completes the analysis and test of the grounding device through the true grounding resistance, improving the accuracy of the device safety test. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0053] Figure 1 It is a schematic flowchart of the steps of a method for testing a generator set device provided by the present invention;

[0054] Figure 2 It is a schematic module flowchart of a generator set device testing system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0055] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0056] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order different from those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0057] In view of the problems existing in the background technology, it is of great practical significance to research and design a testing method, system and computer device for generator set devices.

[0058] As Figure 1 shown, the first aspect of the present invention is to provide a testing method for generator set devices, including the following steps:

[0059] Step S001: Divide the grounding area into several unit areas and obtain the conductivity of each unit area.

[0060] It should be noted that the grounding device of the generator set inserts the current electrode into the soil to ensure that in case of a fault (such as equipment leakage), the current can quickly flow into the ground through the grounding system, preventing the equipment from being charged or electrical fires and other accidents, reducing the fault risk of electrical equipment, preventing the occurrence of electric shock accidents, and protecting the safety of equipment and personnel. Since the grounding device protects the safety of electrical equipment through the grounding resistance of the soil by inserting the current electrode into the soil, it is very important to accurately measure the grounding resistance.

[0061] Furthermore, it should be noted that since the conventional grounding device measures the grounding resistance by the three-electrode method, and the measurement of the grounding resistance is a whole measurement of the grounding resistance without considering the current conduction conditions of different local areas of the earth's soil, the accuracy of the directly obtained grounding resistance will be reduced. Therefore, in this embodiment, specific analysis is carried out by analyzing the conductivity of the local soil.

[0062] Specifically, the area corresponding to the electrodes when measuring the grounding resistance at three levels is denoted as the grounding area; within the grounding areas of the two current electrodes, at a preset distance as the interval, the grounding area is evenly divided into several unit areas; among them, one unit area is a square area with the preset distance multiplied by the preset distance ; the conductivity of each unit area is obtained through a soil conductivity meter.

[0063] Among them, in this embodiment, the preset distance is meters. Among them, in this embodiment, the preset distance is not specifically limited, and the implementer can determine it according to the specific situation.

[0064] Thus, the conductivities of all unit areas in the grounding area are obtained.

[0065] Step S002: According to the conductivity difference between adjacent unit areas, obtain the current flow path between the two current electrodes in the three-level method measurement.

[0066] It should be noted that since the conductivity of the soil is determined by the water content, temperature, minerals, soil structure and density, etc. of the soil; and there may be certain differences in the water content, temperature, minerals, soil structure and density of the soil in different unit areas, resulting in certain differences in the conductivity corresponding to different unit areas, that is, the soil is non-uniform, and the corresponding conductivity is also non-uniform.

[0067] Furthermore, it should be noted that since there are differences between different soils, and the current generally tends to flow to the area with higher conductivity, therefore, the current flow path between the two current electrodes in the three-level method measurement of grounding resistance can be analyzed and determined by analyzing the conductivity between adjacent unit areas.

[0068] Specifically, the unit area corresponding to the outgoing current electrode in the three-level method measurement of grounding resistance is denoted as the starting point, and the unit area corresponding to the incoming current electrode in the three-level method measurement of grounding resistance is denoted as the ending point. According to the starting point, the ending point, and the current graph distance between adjacent two unit areas, the current flow path between the incoming current electrode and the outgoing current electrode is obtained through the Dijkstra algorithm. Among them, the Dijkstra algorithm is a well-known path planning algorithm and will not be specifically described here.

[0069] Obtain the eight unit areas adjacent to each unit area; among them, the eight unit areas adjacent to each unit area are two in the horizontal direction, two in the vertical direction, and four in the diagonal direction.

[0070] The eight unit areas adjacent to each unit area are denoted as the reference unit areas of each unit area.

[0071] Obtain the current flow degree from each unit area to the corresponding reference unit area according to the conductivity between two adjacent unit areas; the current flow degree is specifically expressed by the formula:

[0072]

[0073] In the formula, represents the conductivity of each unit area, represents the conductivity of the th reference unit area corresponding to each unit area, represents the current flow degree from each unit area to the th reference unit area corresponding to it.

[0074] Among them, represents the difference between the conductivity of the th reference unit area corresponding to each unit area and the conductivity of each unit area. When the difference is larger, the current flow degree from each unit area to the th reference unit area corresponding to it is larger; that is, the current is more likely to flow from each unit area to the th reference unit area corresponding to it.

[0075] It should be noted that when each unit area is more likely to flow to a corresponding reference unit area, in the graph of path planning, it means that the current graph distance between each unit area and the corresponding reference unit area is shorter. Therefore, the current graph distance can be obtained by negative correlation mapping through the current flow degree from each unit area to the corresponding reference unit area; the current graph distance is specifically expressed by the formula:

[0076]

[0077] In the formula, represents the current flow degree from each unit area to the th reference unit area corresponding to it, represents the current graph distance from each unit area to the th reference unit area corresponding to it, represents the exponential function with the natural constant as the base.

[0078] Thus, the current flow path between the two current electrodes is obtained.

[0079] Step S003: Merge unit regions with similar conductivity to obtain several merged regions; according to the conductivity difference between each unit region and its adjacent unit regions, obtain the current conduction vector of each unit region, and according to the difference between the current conduction vectors of all unit regions within each merged region and the current conduction vectors of all unit regions in the current flow path, obtain the current direction proximity factor of each merged region; according to the area of each merged region and the length of the current flow path in each merged region, correct and adjust the current direction proximity factor of each merged region to obtain the corrected current direction proximity factor of each merged region.

[0080] It should be noted that due to the non-uniformity of the soil in the grounding region and the non-uniformity of the conductivity, it can be known that there are differences between different soils. Therefore, first, unit regions with the same soil conductivity can be merged, and then the influence degree of the conductivity of all unit regions in the merged region on the current flow direction in the current flow path can be analyzed.

[0081] Specifically, the unit region with the largest conductivity among the eight adjacent unit regions of each unit region is denoted as the neighborhood maximum unit region, and according to each unit region and the neighborhood maximum unit region, obtain the current conduction vector of each unit region; among them, the magnitude of the current conduction vector is the difference between the conductivity of the neighborhood maximum unit region and the conductivity of each unit region, and the direction of the current conduction vector is from the center point of each unit region to the center point of the neighborhood maximum unit region. Among them, in this embodiment, the magnitude of the current conduction vector is mapped in ; where, in this embodiment, the maximum parameter in the preset interval is not specifically limited, and the implementer can determine it according to the specific situation.

[0082] Randomly select several unit regions and denote them as the seed points in the region growth process; according to the conductivity difference between the selected seed points and their adjacent unit regions, perform region growth through the region growth algorithm to obtain several regions grown in the grounding region, denoted as several merged regions. Among them, the region growth algorithm is a well-known technology and will not be specifically described here.

[0083] Perform vector sum operation on the current conduction vectors of all unit regions in each merged region, and denote the vector after the operation as the total current conduction vector of each merged region. Then perform vector sum operation on the current conduction vectors of all unit regions on the current flow path between the two current electrodes, and denote the vector after the operation as the path current conduction vector.

[0084] It should be noted that when measuring the grounding resistance by the three - level method, the current is introduced into the soil through the outgoing current electrode and the incoming current electrode. That is, the current flows from the outgoing current electrode to the incoming current electrode. When the current flows in the soil, an electric field will be formed, and the direction of the electric field is from the outgoing current electrode to the incoming current electrode. This is because the essence of current is the movement of electrons or charged particles, and under the action of the electric field, charges will flow along the direction of the electric field. Therefore, the direction of the current in each merged area will be affected by the direction of the electric field and flow towards the incoming current electrode.

[0085] Furthermore, it should be noted that due to the actual non - uniformity, the direction of the current flow is not a straight line from the outgoing current electrode to the incoming current electrode, but a curved line. Therefore, the path - current guiding vector corresponding to the current - flow path is used as the reference direction of the current flow, and the direction difference between the total current guiding vector of each merged area and the path - current guiding vector is analyzed.

[0086] Specifically, the current - direction proximity factor of each merged area is obtained through the direction difference between the total current guiding vector of each merged area and the path - current guiding vector; the current - direction proximity factor is specifically expressed by the formula:

[0087]

[0088] In the formula, represents the direction angle between the total current guiding vector of the th merged area and the path - current guiding vector, represents the cosine value of represents the current - direction proximity factor of the th merged area, represents the linear normalization function.

[0089] Among them, the direction of the path - current guiding vector represents the general direction of the current flow in the soil. When the direction angle between the total current guiding vector of each merged area and the path - current guiding vector is smaller, it indicates that the current - flow direction of each merged area is closer to the general flow direction. Therefore, the current - direction proximity factor of each merged area is larger; conversely, the current - direction proximity factor of each merged area is smaller.

[0090] Thus, the current - direction proximity factor of each merged area is obtained.

[0091] It should be noted that since the areas corresponding to each merging region are different and the lengths of the current flow paths in each merging region are different, the influence of each merging region on the current direction is different. Therefore, the current direction proximity factor of each merging region can be corrected and adjusted by the area of each merging region and the length of the current flow path in each merging region.

[0092] Specifically, the current direction proximity factor of each merging region is corrected and adjusted by the area of each merging region and the length of the current flow path in each merging region to obtain the corrected current direction proximity factor of each merging region; the corrected current direction proximity factor is specifically expressed by the formula:

[0093]

[0094] In the formula, represents the area of the th merging region, represents the length of the current flow path in the th merging region, represents the current direction proximity factor of the th merging region, represents the corrected current direction proximity factor of the th merging region; represents the linear normalization function.

[0095] Among them, is the weight for correction, that is, when the area corresponding to each merging region is larger and the length of the current flow path in each merging region is longer, the influence on the current direction is also greater. Therefore, when the current direction proximity factor is larger, the corrected current direction proximity factor after correction is also larger.

[0096] Step S004: Directly obtain the overall grounding resistance through the three-level method. According to the overall grounding resistance, calculate the overall conductivity of the grounding area through the relationship between conductivity and grounding resistance; obtain the non-uniformity of the soil according to the differences in the conductivities of all merging regions; adjust the overall conductivity of the grounding area calculated according to the corrected current direction proximity factor of each merging region and the non-uniformity of the soil to obtain the true grounding resistance; complete the analysis and testing of the grounding device through the true grounding resistance.

[0097] It should be noted that when the differences in the conductivities of all merging regions are greater, it indicates that the non-uniformity of the soil is stronger, that is, the influence on measuring the grounding resistance of the grounding device is also greater.

[0098] Specifically, calculate and analyze the non-uniformity of the soil according to the differences in the conductivities of all merging regions; the non-uniformity is specifically expressed by the formula:

[0099]

[0100] In the formula, represents the mean conductivity of all unit regions in the th merged region, represents the mean conductivity of all unit regions in all merged regions, is the absolute value symbol, represents the non-uniformity of the soil.

[0101] Among them, represents the difference between the mean conductivity of all unit regions in each merged region and the mean conductivity of all unit regions in all merged regions. The greater the difference, the greater the non-uniformity of the soil; conversely, the smaller the non-uniformity of the soil.

[0102] Thus, the non-uniformity of the soil is obtained.

[0103] The overall grounding resistance is directly obtained by the three-level method, and then based on the overall grounding resistance, the overall conductivity of the grounding area is calculated through the conductivity-grounding resistance relationship formula; the specific formula for the conductivity-grounding resistance relationship is:

[0104]

[0105] In the formula, represents the overall grounding resistance, represents the calculated overall conductivity, represents the length of the grounding resistance, is the pi.

[0106] Based on the calculated overall conductivity and the mean conductivity of all unit regions in all merged regions, the calculated overall conductivity is analyzed and corrected, and then the true grounding resistance is obtained. The specific formula for the true grounding resistance is:

[0107]

[0108] In the formula, represents the mean conductivity of all unit regions in all merged regions, represents the calculated overall conductivity, represents the non-uniformity of the soil, represents the mean of the correction current direction proximity factors of all merged regions, represents the length of the grounding resistance, represents the linear normalization function, represents the true grounding resistance, is the pi, is the absolute value symbol, represents the sign function, which is used to determine the positive or negative sign.

[0109] Among them, the function of the function is:

[0110]

[0111] Among them, represents the difference between the mean conductivity of all unit areas in all merged areas and the calculated overall conductivity, which is used to reflect the difference between the calculated conductivity and the true conductivity, and the difference value is used as the range size for adjusting the conductivity. represents the adjustment of the weight size; when the non-uniformity of the soil is stronger and larger, the greater the influence on the current flow direction and the greater the degree of hindering the current passing through, it indicates that the conductivity is smaller; on the contrary, it indicates that the conductivity is larger. When the mean value of the corrected current direction proximity factor of all merged areas is larger, it indicates that the conductivity direction of the merged area is more the same as the path direction, that is, the degree of hindering the current flow is smaller, then it indicates that the conductivity is higher; on the contrary, when the mean value of the corrected current direction proximity factor of all merged areas is smaller, it indicates that the conductivity direction of the merged area is more different from the path direction, that is, the degree of hindering the current flow is larger, then it indicates that the conductivity is lower. Through the original conductivity and the adjusted conductivity to obtain the adjusted conductivity .

[0112] Thus, the true grounding resistance is obtained.

[0113] It should be noted that the method of obtaining the true grounding resistance process is denoted as the test method of the new grounding resistance; in order to determine the measurement accuracy of the test method of the new grounding resistance and the test method of the traditional grounding resistance; then an experiment needs to be designed to analyze the effect of the test method of the new grounding resistance through the experiment.

[0114] Specifically, select multiple areas with different soil properties at the same location for testing, such as dry soil, wet soil, sandy soil, etc.; respectively use the test method of the new grounding resistance and the test method of the traditional grounding resistance to test multiple areas with different soil properties; analyze the error through the measured values and standard values of the test method of the new grounding resistance and the test method of the traditional grounding resistance; the specific error calculation process is expressed by the formula as:

[0115]

[0116] In the formula, represents the measured value when each method tests each area, Represents the standard value during the test for each area. Represents the error during the test for each area with each method. Is the absolute value symbol.

[0117] Finally, the average error of the traditional grounding resistance test method in all areas is , and the average error of the new grounding resistance test method in all areas is ; It can be seen from the experimental results that the new grounding resistance test method is superior to the traditional grounding resistance test method.

[0118] Finally, analyze the safety level of the grounding device through the actual grounding resistance to protect the safety of the generator set.

[0119] Such as Figure 2 shown, the second aspect of the present invention is to provide a generator set device test system, including:

[0120] Data acquisition module 101: Used to measure the area corresponding to the current electrode when measuring the grounding resistance using the three - electrode method, denoted as the grounding area, divide the grounding area into several unit areas, and obtain the conductivity of each unit area.

[0121] Current path planning module 102: Used to obtain the current flow path between two current electrodes in the three - electrode method according to the conductivity difference between adjacent unit areas.

[0122] Local area analysis module 103: Used to merge unit areas with similar conductivities to obtain several merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and its adjacent unit areas; obtain the current direction proximity factor of each merged area according to the difference between the current guiding vectors of all unit areas within each merged area and the current guiding vectors of all unit areas in the current flow path; correct and adjust the current direction proximity factor of each merged area according to the area of each merged area and the length of the current flow path in each merged area to obtain the corrected current direction proximity factor of each merged area.

[0123] Safety test analysis module 104: Used to directly obtain the overall grounding resistance through the three - electrode method, calculate the overall conductivity of the grounding area according to the relationship between conductivity and grounding resistance based on the overall grounding resistance; obtain the non - uniformity of the soil according to the conductivity differences of all merged areas; adjust the calculated overall conductivity of the grounding area according to the corrected current direction proximity factor of each merged area and the non - uniformity of the soil to obtain the actual grounding resistance; complete the analysis and test of the grounding device through the actual grounding resistance.

[0124] The third aspect of the present invention is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, a method for testing generator set devices is implemented.

[0125] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) containing computer-usable program code.

[0126] The present invention is described with reference to the flowcharts and / or block diagrams of methods, systems, and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0127] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including instruction means, and the instruction means implement the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0128] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Therefore, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one or more flows and / or blocks Figure 1 one or more blocks.

[0129] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific implementation manners of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for testing a generator set device, characterized in that, Including: The area corresponding to the current electrode when measuring the grounding resistance using the three - level method, denoted as the grounding area, dividing the grounding area into several unit areas, and obtaining the conductivity of each unit area; According to the conductivity difference between adjacent unit areas, obtaining the current flow path between the two current electrodes in the three - level measurement; Merging the unit areas with similar conductivity to obtain several merged areas; According to the conductivity difference between each unit area and its adjacent unit areas, obtaining the current conduction vector of each unit area. According to the difference between the current guiding vectors of all unit areas within each merged area and the current guiding vectors of all unit areas in the current flow path, obtaining the current direction proximity factor of each merged area; According to the area of each merged area and the length of the current flow path in each merged area, correcting and adjusting the current direction proximity factor of each merged area to obtain the corrected current direction proximity factor of each merged area; Directly obtaining the overall grounding resistance through the three - level method, and calculating the overall conductivity of the grounding area according to the relationship between conductivity and grounding resistance; Obtaining the non - uniformity of the soil according to the conductivity differences of all merged areas; Adjusting the calculated overall conductivity of the grounding area according to the corrected current direction proximity factor of each merged area and the non - uniformity of the soil to obtain the true grounding resistance; Completing the analysis and testing of the grounding device through the true grounding resistance.

2. The method for testing a generator set device according to claim 1, characterized in that, The step of dividing the grounding area into several unit areas and obtaining the conductivity of each unit area includes: In the grounding regions of two current electrodes, divide the grounding regions evenly into a number of unit regions at intervals of a preset distance; where one unit region is a square region with a side length equal to the product of the preset distance multiplied by the preset distance ; obtain the conductivity of each unit region using a soil conductivity meter. ​ 3. A method for testing a generator set device according to claim 1, characterized in that, The step of obtaining the current flow path between the two current electrodes in the three - level measurement according to the conductivity difference between adjacent unit areas includes: Taking the unit area corresponding to the outgoing current electrode when measuring the grounding resistance using the three - level method as the starting point, and taking the unit area corresponding to the incoming current electrode when measuring the grounding resistance using the three - level method as the end point; According to the starting point, the end point, and the current map distance between adjacent two unit areas, using the Dijkstra algorithm to obtain the current flow path between the incoming current electrode and the outgoing current electrode; Obtain the eight unit areas adjacent to each unit area; among them, the eight unit areas adjacent to each unit area are two in the horizontal direction, two in the vertical direction, and four in the diagonal direction; Denoting the eight unit areas adjacent to each unit area as the reference unit areas of each unit area; Obtaining the current flow degree from each unit area to its corresponding reference unit area according to the conductivity between adjacent two unit areas; The current flow degree is specifically expressed by the formula: In the formula, represents the conductivity of each unit area, represents the conductivity of the th reference unit area corresponding to each unit area, represents the degree of current flow direction from each unit area to the th reference unit area corresponding thereto; Obtaining the current map distance through negative - correlation mapping of the current flow degree from each unit area to its corresponding reference unit area; The current map distance is specifically expressed by the formula: In the formula, represents the degree of current flow from each unit area to the corresponding th reference unit area, represents the current map distance from each unit area to the corresponding th reference unit area, represents the exponential function with the natural constant as the base.

4. A method for testing a generator set device according to claim 1, characterized in that, The step of merging the unit areas with similar conductivity to obtain several merged areas includes: Randomly selecting several unit areas and denoting them as the seed points in the region - growing process; According to the difference in conductivity between the selected seed points and adjacent unit areas, performing region - growing through the region - growing algorithm to obtain several regions grown in the grounding area, denoted as several merged areas.

5. A method for testing a generator set device according to claim 1, characterized in that, Obtaining the current conduction vector of each unit area according to the conductivity difference between each unit area and its adjacent unit areas, and obtaining the current direction proximity factor of each merged area according to the difference between the current conduction vectors of all unit areas within each merged area and the current conduction vectors of all unit areas in the current flow path, including: Denote the unit region with the maximum conductivity among the eight unit regions adjacent to each unit region as the neighborhood maximum unit region. Based on each unit region and the neighborhood maximum unit region, obtain the current conduction vector of each unit region. Among them, the magnitude of the current conduction vector is the difference between the conductivity of the neighborhood maximum unit region and the conductivity of each unit region, and the direction of the current conduction vector is from the center point of each unit region to the center point of the neighborhood maximum unit region. Among them, map the magnitude of the current conduction vector on ; among them, is the maximum parameter of the preset interval; Performing a vector sum operation on the current conduction vectors of all unit areas in each merged area, and denoting the vector after the operation as the total current conduction vector of each merged area; then performing a vector sum operation on the current conduction vectors of all unit areas on the current flow path between the two current electrodes, and denoting the vector after the operation as the path current conduction vector; Obtaining the current direction proximity factor of each merged area through the direction difference between the total current conduction vector of each merged area and the path current conduction vector; the current direction proximity factor is specifically expressed by the formula: In the formula, represents the direction angle between the total current guiding vector of the th merged region and the path current guiding vector, represents the cosine value of and represents the linear normalization function.

6. A method for testing a generator set device according to claim 1, characterized in that, Adjusting and correcting the current direction proximity factor of each merged area according to the area of each merged area and the length of the current flow path in each merged area to obtain the corrected current direction proximity factor of each merged area, including: Wherein, represents the area of the th merged region, represents the length of the current flow path in the th merged region, represents the current direction proximity factor of the th merged region, represents the corrected current direction proximity factor of the th merged region; represents a linear normalization function.

7. A method for testing a generator set device according to claim 1, characterized in that, Calculating the overall conductivity of the grounding area according to the overall grounding resistance through the relationship between conductivity and grounding resistance; obtaining the non-uniformity of the soil according to the conductivity differences of all merged areas, including: The non-uniformity is specifically expressed by the formula: In the formula, represents the mean conductivity of all unit regions in the th merged region, represents the mean conductivity of all unit regions in all merged regions, is the absolute value symbol, represents the non-uniformity of the soil; The relationship between conductivity and grounding resistance is specifically expressed by the formula: In the formula, represents the overall grounding resistance, represents the calculated overall conductivity, represents the length of the grounding resistance, is the pi.

8. A method for testing a generator set device according to claim 1, characterized in that, Adjusting the calculated overall conductivity of the grounding area according to the corrected current direction proximity factor of each merged area and the non-uniformity of the soil to obtain the true grounding resistance, including: Wherein, represents the mean conductivity of all unit regions in all merged regions, represents the calculated overall conductivity, represents the non-uniformity of the soil, represents the mean of the corrected current direction proximity factors of all merged regions, represents the length of the grounding resistance, represents the linear normalization function, represents the true grounding resistance, is the pi, is the absolute value symbol, represents the sign function used to determine the positive or negative sign.

9. A generator set device testing system, characterized in that, Including: Data acquisition module: used for the area corresponding to the current electrode when measuring the grounding resistance using the three-electrode method, denoted as the grounding area, dividing the grounding area into several unit areas, and obtaining the conductivity of each unit area; Current path planning module: used for obtaining the current flow path between the two current electrodes in the three-electrode measurement according to the conductivity difference between adjacent unit areas; Local area analysis module: used for merging unit areas with similar conductivities to obtain several merged areas; obtaining the current conduction vector of each unit area according to the conductivity difference between each unit area and its adjacent unit areas, obtaining the current direction proximity factor of each merged area according to the difference between the current conduction vectors of all unit areas within each merged area and the current conduction vectors of all unit areas in the current flow path; adjusting and correcting the current direction proximity factor of each merged area according to the area of each merged area and the length of the current flow path in each merged area to obtain the corrected current direction proximity factor of each merged area; Safety test analysis module: used for directly obtaining the overall grounding resistance through the three-electrode method, calculating the overall conductivity of the grounding area according to the overall grounding resistance through the relationship between conductivity and grounding resistance; obtaining the non-uniformity of the soil according to the conductivity differences of all merged areas; According to the correction current direction proximity factor of each merging area and the inhomogeneity of the soil, the overall conductivity of the grounding area calculated is adjusted to obtain the true grounding resistance; the analysis and test of the grounding device are completed through the true grounding resistance.

10. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a generator set device testing method according to any one of claims 1-8.

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