Generator set device testing method and system and computer equipment

Abstract

The invention relates to the technical field of device testing, in particular to a generator set device testing method and system and computer equipment, and the method comprises the steps: obtaining the conductivity of each unit region and a merging region; according to the conductivity difference between the adjacent unit areas, obtaining a current flow direction path between two current electrodes and a current direction approaching factor of each merging area in the three-stage method measurement; correcting and adjusting the current direction approaching factor to obtain a corrected current direction approaching factor; the non-uniformity of the soil is obtained according to the difference of the electric conductivity of all the merging areas; according to the correction current direction approaching factor of each merging area and the non-uniformity of soil, adjusting the calculated overall conductivity of the grounding area to obtain real grounding resistance; and the analysis test of the grounding device is completed through the real grounding resistance. According to the invention, the accuracy of grounding resistance measurement of the grounding device is improved.

Description

Technical Field

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

[0002] The generator set component test method is mainly used to ensure that the various components 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 grounding device test is one of the generator set component tests.

[0003] The purpose of grounding device testing is to ensure that the grounding system of electrical equipment and systems works properly, prevent safety problems caused by electrical equipment failure, protect personnel safety, and reduce equipment damage. The main function of the grounding device is to safely introduce current into the earth through the ground wire, reduce the risk of electrical equipment failure, and prevent electric shock accidents. Common grounding devices include grounding electrodes, grounding conductors, and connecting parts of grounding devices.

[0004] When testing the grounding resistance of a grounding device, due to interference from 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 grounding resistance measurement of the grounding device. Summary of the invention

[0005] The present invention provides a generator set component testing method, system and computer equipment, which are used to solve the accuracy problem of ground resistance testing.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A first aspect of the present invention is to provide a method for testing a generator set device, comprising: The area corresponding to the current electrode when measuring the grounding resistance using the three-level method is recorded as the grounding area, the grounding area is divided into several unit areas, and the conductivity of each unit area is obtained; According to the conductivity difference between adjacent unit areas, the current flow path between two current electrodes in the three-level method measurement is obtained; Merge unit areas with similar conductivity to obtain several merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtain the current direction approach factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path; correct and adjust the current direction approach 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 approach factor of each merged area; The overall grounding resistance is directly obtained through the three-level method. Based on the overall grounding resistance, the overall conductivity of the grounding area is calculated through the relationship between conductivity and grounding resistance. The soil heterogeneity is obtained based on the difference in conductivity of all merged areas. According to the corrected current direction approach factor and soil heterogeneity of each merged area, the calculated overall conductivity of the grounding area is adjusted to obtain the actual grounding resistance. The analysis and test of the grounding device is completed through the actual grounding resistance.

[0007] Furthermore, dividing the grounding area into a plurality of unit areas and obtaining the conductivity of each unit area includes: The grounding area of ​​the two current electrodes is carried out at a preset distance The grounding area is evenly divided into several unit areas, where a unit area is the preset distance. Multiply by preset distance square area; the conductivity of each unit area is obtained by the soil conductivity meter.

[0008] Further, the method of obtaining the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit areas includes: The unit area corresponding to the outgoing current electrode when measuring the grounding resistance by the three-level method is recorded as the starting point, and the unit area corresponding to the incoming current electrode when measuring the grounding resistance by the three-level method is recorded as the ending point; according to the starting point, the ending point and the current diagram distance between two adjacent unit areas, the current flow path between the incoming current electrode and the outgoing current electrode is obtained by the Dijkstra algorithm; Get eight unit areas adjacent to each unit area; the eight unit areas adjacent to each unit area are two in the horizontal direction, two in the vertical direction, and Four directions; The eight unit areas adjacent to each unit area are recorded as the reference unit areas of each unit area; The degree of current flow from each unit area to the corresponding reference unit area is obtained according to the conductivity between two adjacent unit areas; the degree of current flow is specifically expressed by the formula:

[0009] In the formula, represents the conductivity per unit area, Indicates the first The conductivity of a reference unit area, Indicates that each unit area is The degree of current flow in a reference unit area; The current map distance is obtained by negative correlation mapping the current flow direction from each unit area to the corresponding reference unit area; the current map distance is specifically expressed by the formula:

[0010] In the formula, Indicates that each unit area is The degree of current flow in a reference unit area, Indicates that each unit area is The current map distance of the reference unit area, Represents an exponential function with a natural constant as its base.

[0011] Furthermore, the unit regions with similar conductivity are merged to obtain a plurality of merged regions, including: Several unit areas are randomly selected and recorded as seed points in the process of regional growth. According to the difference in conductivity between the selected seed points and the adjacent unit areas, regional growth is performed through the regional growing algorithm to obtain several areas grown out of the grounding area, which are recorded as several merged areas.

[0012] Further, the method of obtaining the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtaining the current direction proximity factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path, includes: The unit area with the largest conductivity among the eight unit areas adjacent to each unit area is recorded as the largest unit area in the neighborhood. According to each unit area and the largest unit area in the neighborhood, the current conduction vector of each unit area is obtained; wherein the magnitude of the current conduction vector is the difference between the conductivity of the largest unit area in the neighborhood and the conductivity of each unit area, and the direction of the current conduction vector is from the center point of each unit area to the center point of the largest unit area in the neighborhood; wherein the magnitude of the current conduction vector is mapped on ;in, 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 recording the vector after the operation as the total current steering 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 recording the vector after the operation as the path current steering vector; The current direction proximity factor of each merged region is obtained by the direction difference between the total current steering vector of each merged region and the path current steering vector; the current direction proximity factor is specifically expressed by the formula:

[0013] In the formula, Indicates The angle between the total current steering vector of the merged region and the path current steering vector is express The cosine value of Indicates The current direction of the merged region is close to the factor, represents the linear normalization function.

[0014] Further, the current direction proximity factor of each merged area is corrected and adjusted 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:

[0015] In the formula, Indicates The area of ​​the merged region, Indicates the current flow path in The length of the merged region, Indicates The current direction of the merged region is close to the factor, Indicates Corrected current direction approach factor for each merged region; represents the linear normalization function.

[0016] Furthermore, the overall conductivity of the grounding area is calculated based on the overall grounding resistance through the relationship between conductivity and grounding resistance; and the soil heterogeneity is obtained based on the difference in conductivity of all combined areas, including: The non-uniformity is specifically expressed by the formula:

[0017] In the formula, Indicates The mean value of the conductivity of all unit areas in the merged area, represents the mean value of the conductivity of all unit areas in all merged regions, is the absolute value symbol, Indicates the heterogeneity of the soil; The relationship between conductivity and ground resistance is specifically expressed by the formula:

[0018] In the formula, represents the overall ground resistance, represents the calculated overall conductivity, Indicates the length of the grounding resistor, is the ratio of pi.

[0019] Furthermore, the overall conductivity of the calculated grounding area is adjusted according to the corrected current direction proximity factor of each merged area and the non-uniformity of the soil to obtain the real grounding resistance, including:

[0020] In the formula, represents the mean value of the conductivity of all unit areas in all merged regions, represents the calculated overall conductivity, Indicates the heterogeneity of the soil. represents the mean of the corrected current direction approach factors of all merged regions, Indicates the length of the grounding resistor, represents the linear normalization function, Represents the actual ground resistance, is the circumference of a circle, is the absolute value symbol, Represents the sign function, which is used to determine the positive and negative signs.

[0021] A second aspect of the present invention is to provide a generator set component testing system, comprising: Data acquisition module: used to measure the area corresponding to the current electrode when the grounding resistance is measured using the three-level method, record it as the grounding area, divide the grounding area into several unit areas, and obtain the conductivity of each unit area; Current path planning module: used to obtain the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit areas; Local area analysis module: used to merge unit areas with similar conductivity to obtain several merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtain the current direction proximity factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering 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; Safety test analysis module: used to directly obtain the overall grounding resistance through the three-level method, and calculate the overall conductivity of the grounding area based on the overall grounding resistance through the relationship between conductivity and grounding resistance; obtain the soil non-uniformity based on the difference in conductivity of all merged areas; adjust the calculated overall conductivity of the grounding area based on the corrected current direction approach factor and soil non-uniformity of each merged area to obtain the actual grounding resistance; complete the analysis and test of the grounding device through the actual grounding resistance.

[0022] A third aspect of the present invention is to provide a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the generator set component testing method when executing the computer program.

[0023] 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 for the current flow; merges unit areas with similar conductivity to obtain several merged areas; according to the conductivity difference between each unit area and the adjacent unit areas, obtains the current conduction vector of each unit area, and according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path, obtains the current direction proximity factor of each merged area, thereby improving the accuracy of interference analysis of different merged areas on the current flow; according to each merged area, The current direction approach factor of each merged area is corrected and adjusted based on the area of ​​the region and the length of the current flow path in each merged area to obtain the corrected current direction approach factor of each merged area, thereby improving the accuracy of the analysis of the degree of influence of different merged areas on the current flow direction; the overall grounding resistance is directly obtained through the three-level method, and the overall conductivity of the grounding area is calculated based on the overall grounding resistance through the relationship between conductivity and grounding resistance; the soil non-uniformity is obtained based on the difference in conductivity of all merged areas; the overall conductivity of the calculated grounding area is adjusted based on the corrected current direction approach factor of each merged area and the soil non-uniformity to obtain the real grounding resistance, thereby improving the accuracy of the grounding resistance measurement of the grounding device; the analysis and test of the grounding device is completed through the real grounding resistance, thereby improving the accuracy of the device safety test. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic flow chart of the steps of a method for testing a generator set device is provided for the present invention; Figure 2 A schematic diagram of a module flow of a generator set component testing system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0027] It should be noted that the terms "first", "second", etc. in the specification 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 the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] In view of the problems existing in the background technology, a generator set component testing method, system and computer equipment are studied and designed, which has important practical significance.

[0029] like Figure 1 As shown, the first aspect of the present invention is to provide a method for testing a generator set device, comprising the following steps: Step S001: Divide the grounding area into a number of unit areas, and obtain the conductivity of each unit area.

[0030] It should be noted that the grounding device of the generator set inserts the current electrode into the soil to ensure that in the event of a fault (such as equipment leakage), the current can quickly flow into the ground through the grounding system to prevent accidents such as equipment energization or electrical fires, reduce the risk of electrical equipment failure, prevent electric shock accidents, and protect the safety of equipment and personnel. Since the grounding device inserts the current electrode into the soil and protects the safety of electrical equipment through the grounding resistance of the soil, it is very important to accurately measure the grounding resistance.

[0031] It should be further explained that, since the conventional grounding device measures the grounding resistance by the three-level method, and the grounding resistance is measured as a whole, the current conductivity of different local areas of the earth's soil is not considered, resulting in a decrease in the accuracy of the directly obtained grounding resistance. Therefore, this embodiment performs a specific analysis by analyzing the conductivity of the local soil.

[0032] Specifically, the area corresponding to the electrode when the grounding resistance is measured using the three-level method is recorded as the grounding area; the grounding area of ​​the two current electrodes is measured at a preset distance. The grounding area is evenly divided into several unit areas, where a unit area is the preset distance. Multiply by preset distance square area; the conductivity of each unit area is obtained by the soil conductivity meter.

[0033] In this embodiment, the preset distance Meters, wherein in this embodiment, the preset distance There is no specific limitation and implementers can decide based on specific circumstances.

[0034] At this point, the conductivity of all unit areas in the grounding area is obtained.

[0035] Step S002: According to the conductivity difference between adjacent unit areas, the current flow path between two current electrodes in the three-level method measurement is obtained.

[0036] It should be noted that the conductivity of soil is determined by the water content, temperature, minerals, soil structure and density of the soil; and the water content, temperature, minerals, soil structure and density of the soil in different unit areas may be different, resulting in certain differences in the corresponding conductivity of different unit areas, that is, the soil is non-uniform, and the corresponding conductivity is also non-uniform.

[0037] It should be further explained that, due to the differences between different soils, the current generally tends to flow to areas with high conductivity. Therefore, the current flow path between the two current electrodes when measuring the ground resistance using the three-level method can be determined by analyzing the conductivity between adjacent unit areas.

[0038] Specifically, the unit area corresponding to the outgoing current electrode when measuring the grounding resistance by the three-level method is recorded as the starting point, and the unit area corresponding to the incoming current electrode when measuring the grounding resistance by the three-level method is recorded as the ending point. According to the starting point, the ending point, and the current diagram distance between two adjacent unit areas, the current flow path between the incoming current electrode and the outgoing current electrode is obtained by the Dijkstra algorithm. Among them, the Dijkstra algorithm is a well-known path planning algorithm, which will not be described in detail here.

[0039] Get eight unit areas adjacent to each unit area; the eight unit areas adjacent to each unit area are two in the horizontal direction, two in the vertical direction, and Four directions.

[0040] The eight unit areas adjacent to each unit area are recorded as reference unit areas of each unit area.

[0041] The degree of current flow from each unit area to the corresponding reference unit area is obtained according to the conductivity between two adjacent unit areas; the degree of current flow is specifically expressed by the formula:

[0042] In the formula, represents the conductivity per unit area, Indicates the first The conductivity of a reference unit area, Indicates that each unit area is The degree of current flow in a reference unit area.

[0043] in, Indicates the first The difference between the conductivity of the reference unit area and each unit area, when the difference is larger, each unit area to the corresponding The greater the degree of current flow in the reference unit area, the easier it is for the current to flow from each unit area to the corresponding reference unit area.

[0044] It should be noted that when each unit area is more likely to flow to a corresponding reference unit area, the current graph distance between each unit area and a corresponding reference unit area is shorter in the path planning diagram. Therefore, the current graph distance can be obtained by negative correlation mapping through the degree of current flow from each unit area to the corresponding reference unit area; the current graph distance is specifically expressed by the formula:

[0045] In the formula, Indicates that each unit area is The degree of current flow in a reference unit area, Indicates that each unit area is The current map distance of the reference unit area, Represents an exponential function with a natural constant as its base.

[0046] At this point, the current flow path between the two current electrodes is obtained.

[0047] Step S003: unit areas with similar conductivity are merged to obtain several merged areas; the current conduction vector of each unit area is obtained according to the conductivity difference between each unit area and the adjacent unit area, and the current direction approach factor of each merged area is obtained according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path; the current direction approach factor of each merged area is corrected and adjusted 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 approach factor of each merged area.

[0048] It should be noted that due to the non-uniformity of the soil in the grounding area and the non-uniformity of the conductivity, it can be known that there are differences between different soils. Therefore, the unit areas with the same soil conductivity can be merged first, and then the degree of influence of the conductivity of all unit areas in the merged area on the current flow direction in the current flow path can be analyzed.

[0049] Specifically, the unit area with the largest conductivity among the eight unit areas adjacent to each unit area is recorded as the largest unit area in the neighborhood, and the current conduction vector of each unit area is obtained according to each unit area and the largest unit area in the neighborhood; wherein the magnitude of the current conduction vector is the difference between the conductivity of the largest unit area in the neighborhood and the conductivity of each unit area, and the direction of the current conduction vector is from the center point of each unit area to the center point of the largest unit area in the neighborhood. ; Among them, in this embodiment, the maximum parameter of the preset interval There is no specific limitation and implementers can decide based on specific circumstances.

[0050] A number of unit areas are randomly selected and recorded as seed points in the region growing process; according to the difference in conductivity between the selected seed points and the adjacent unit areas, the region growing algorithm is used to perform region growing, and a number of regions grown out of the grounding area are obtained, which are recorded as a number of merged regions. The region growing algorithm is a well-known technology and will not be described in detail here.

[0051] A vector sum operation is performed on the current conduction vectors of all unit areas in each merged area, and the vector after the operation is recorded as the total current steering vector of each merged area. A vector sum operation is then performed on the current conduction vectors of all unit areas on the current flow path between the two current electrodes, and the vector after the operation is recorded as the path current steering vector.

[0052] It should be noted that the three-level method measures ground resistance by inserting the outgoing current electrode and the incoming current electrode into the soil, 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 is 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 the current is the movement of electrons or charged particles, and under the action of the electric field, the charge will flow along the direction of the electric field. Therefore, the current direction of each merged area in the soil will be affected by the direction of the electric field and flow in the direction of the incoming current electrode.

[0053] It should be further explained that due to the actual non-uniformity, the direction of current flow is not a straight line direction from the outgoing current electrode to the incoming current electrode, but a curved direction. Therefore, the path current steering vector corresponding to the current flow path is used as the reference direction of the current flow, and the analysis is performed by the directional difference between the total current steering vector of each merged area and the path current steering vector.

[0054] Specifically, the current direction proximity factor of each merged region is obtained by the direction difference between the total current steering vector and the path current steering vector of each merged region; the current direction proximity factor is specifically expressed by the formula:

[0055] In the formula, Indicates The angle between the total current steering vector of the merged region and the path current steering vector is express The cosine value of Indicates The current direction of the merged region is close to the factor, represents the linear normalization function.

[0056] Among them, the direction of the path current steering vector represents the approximate flow direction of the current in the soil. When the direction angle between the total current steering vector of each merged area and the path current steering vector is smaller, it means that the current flow direction of each merged area is closer to the approximate flow direction, so the current direction proximity factor of each merged area is larger; conversely, the current direction proximity factor of each merged area is smaller.

[0057] At this point, the current direction proximity factor of each merged region is obtained.

[0058] It should be noted that since the area corresponding to each merged area is different and the length of the current flow path in each merged area is different, the influence of each merged area on the direction of the current is different. Therefore, the current direction approach factor of each merged area can be corrected and adjusted according to the area of ​​each merged area and the length of the current flow path in each merged area.

[0059] Specifically, the current direction proximity factor of each merged area is corrected and adjusted according to the area of ​​each merged area and the length of the current flow path in each merged area to obtain a corrected current direction proximity factor of each merged area; the corrected current direction proximity factor is specifically expressed by the formula:

[0060] In the formula, Indicates The area of ​​the merged region, Indicates the current flow path in The length of the merged region, Indicates The current direction of the merged region is close to the factor, Indicates Corrected current direction approach factor for each merged region; represents the linear normalization function.

[0061] in, The weight used for correction, that is, the larger the area corresponding to each merged area and the longer the current flow path in each merged area, the greater the influence on the current direction. Therefore, when the current direction approach factor is larger, the corrected current direction approach factor is also larger.

[0062] Step S004: directly obtain the overall grounding resistance through the three-level method, and calculate the overall conductivity of the grounding area based on the overall grounding resistance through the relationship between conductivity and grounding resistance; obtain the soil heterogeneity based on the difference in conductivity of all merged areas; adjust the calculated overall conductivity of the grounding area based on the corrected current direction approach factor and soil heterogeneity of each merged area to obtain the actual grounding resistance; complete the analysis and test of the grounding device through the actual grounding resistance.

[0063] It should be noted that the greater the difference in conductivity of all combined areas, the stronger the soil non-uniformity, that is, the greater the impact on the grounding resistance measured by the grounding device.

[0064] Specifically, the soil heterogeneity is calculated and analyzed based on the difference in conductivity of all combined areas; the heterogeneity is specifically expressed by the formula:

[0065] In the formula, Indicates The mean value of the conductivity of all unit areas in the merged area, represents the mean value of the conductivity of all unit areas in all merged regions, is the absolute value symbol, Indicates the heterogeneity of the soil.

[0066] in, It represents the difference between the mean value of the conductivity of all unit areas in each merged area and the mean value of the conductivity of all unit areas in all merged areas. The larger the difference, the greater the soil heterogeneity; otherwise, the smaller the soil heterogeneity.

[0067] At this point, the heterogeneity of the soil is obtained.

[0068] The overall grounding resistance is directly obtained by the three-level method, and then the overall conductivity of the grounding area is calculated based on the overall grounding resistance by the conductivity-grounding resistance relationship formula; the conductivity-grounding resistance relationship formula is specifically:

[0069] In the formula, represents the overall ground resistance, represents the calculated overall conductivity, Indicates the length of the grounding resistor, is the ratio of pi.

[0070] The calculated overall conductivity is analyzed and corrected according to the average value of the conductivity of all unit areas in all merged areas, and then the real grounding resistance is obtained. The real grounding resistance is specifically expressed by the formula:

[0071] In the formula, represents the mean value of the conductivity of all unit areas in all merged regions, represents the calculated overall conductivity, Indicates the heterogeneity of the soil. represents the mean of the corrected current direction approach factors of all merged regions, Indicates the length of the grounding resistor, represents the linear normalization function, Represents the actual ground resistance, is the circumference of a circle, is the absolute value symbol, Represents the sign function, which is used to determine the positive and negative signs.

[0072] in, The function does the following:

[0073] in, It represents the difference between the average conductivity of all unit areas in all merged areas and the calculated overall conductivity, and is used to reflect the difference between the calculated conductivity and the actual conductivity. The difference is used as the range for adjusting the conductivity. Indicates adjustment The weight of the soil is greater; when the soil non-uniformity is stronger and greater, the impact on the flow of current is greater, the degree of obstruction to the flow of current is greater, and the conductivity is smaller; conversely, the conductivity is greater. When the corrected current direction of all merged areas is close to the mean of the factor, it means that the conductive direction of the merged area is more similar to the path direction, that is, the degree of obstruction to the flow of current is smaller, and the conductivity is higher; conversely, when the corrected current direction of all merged areas is close to the mean of the factor, it means that the conductive direction of the merged area is more different from the path direction, that is, the degree of obstruction to the flow of current is greater, and the conductivity is lower. Through the original conductivity and adjusted conductivity To obtain the adjusted conductivity .

[0074] At this point, the real ground resistance is obtained.

[0075] It should be noted that the method of obtaining the actual grounding resistance is recorded as the new grounding resistance test method; in order to determine the measurement accuracy of the new grounding resistance test method and the traditional grounding resistance test method; it is necessary to design an experiment to analyze the effect of the new grounding resistance test method through the experiment.

[0076] Specifically, multiple areas with different soil properties are selected at the same location for testing, such as dry soil, wet soil, sandy soil, etc.; the new grounding resistance test method and the traditional grounding resistance test method are used to test multiple areas with different soil properties; the error is analyzed by the measured values ​​and standard values ​​of the new grounding resistance test method and the traditional grounding resistance test method; the error calculation process is specifically expressed by the formula:

[0077] In the formula, It represents the measured value of each method in each area test. Indicates the standard value when testing each area, It represents the error of each method in each area test, is the absolute value symbol.

[0078] Finally, the error average of the traditional ground resistance test method in all areas is The new ground resistance test method has an average error of ; The experimental results show that the new grounding resistance test method is better than the traditional grounding resistance test method.

[0079] Finally, the safety of the grounding device is analyzed through the actual grounding resistance to protect the safety of the generator set.

[0080] like Figure 2 As shown, the second aspect of the present invention is to provide a generator set device testing system, comprising: Data acquisition module 101: used to measure the grounding resistance using the three-level method, and the area corresponding to the current electrode is recorded as the grounding area, the grounding area is divided into a number of unit areas, and the conductivity of each unit area is obtained; The current path planning module 102 is used to obtain the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit areas; The local area analysis module 103 is used to merge unit areas with similar conductivity to obtain a plurality of merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtain the current direction proximity factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path; and 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; Safety test analysis module 104: used to directly obtain the overall grounding resistance through the three-level method, and calculate the overall conductivity of the grounding area based on the overall grounding resistance through the relationship between conductivity and grounding resistance; obtain the soil non-uniformity based on the difference in conductivity of all merged areas; adjust the calculated overall conductivity of the grounding area based on the corrected current direction approach factor of each merged area and the soil non-uniformity to obtain the actual grounding resistance; complete the analysis and test of the grounding device through the actual grounding resistance.

[0081] A 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, wherein the processor implements a method for testing components of a generator set when executing the computer program.

[0082] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may 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.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, systems, and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes 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 a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the process in the flowchart. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A method for testing components of a generator set, characterized in that: include: The area corresponding to the current electrode when measuring the grounding resistance using the three-level method is recorded as the grounding area, the grounding area is divided into several unit areas, and the conductivity of each unit area is obtained; According to the conductivity difference between adjacent unit areas, the current flow path between two current electrodes in the three-level method measurement is obtained; Merge unit areas with similar conductivity to obtain several merged areas; According to the conductivity difference between each unit area and the adjacent unit area, the current conduction vector of each unit area is obtained, and according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path, the current direction approach factor of each merged area is obtained; according to the area of ​​each merged area and the length of the current flow path in each merged area, the current direction approach factor of each merged area is corrected and adjusted to obtain the corrected current direction approach factor of each merged area; The overall grounding resistance is directly obtained through the three-level method. Based on the overall grounding resistance, the overall conductivity of the grounding area is calculated through the relationship between conductivity and grounding resistance; the soil heterogeneity is obtained based on the difference in conductivity of all combined areas; According to the corrected current direction approach factor of each merged area and the non-uniformity of the soil, the calculated overall conductivity of the grounding area is adjusted to obtain the real grounding resistance; the analysis and test of the grounding device is completed through the real grounding resistance.

2. A generator set component testing method according to claim 1, characterized in that: The step of dividing the grounding area into a plurality of unit areas and obtaining the conductivity of each unit area includes: The grounding area of ​​the two current electrodes is carried out at a preset distance The grounding area is evenly divided into several unit areas, where a unit area is the preset distance. Multiply by preset distance square area; the conductivity of each unit area is obtained by the soil conductivity meter.

3. A method for testing components of a generator set according to claim 1, characterized in that: The method of obtaining the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit areas includes: The unit area corresponding to the outgoing current electrode when measuring the grounding resistance by the three-level method is recorded as the starting point, and the unit area corresponding to the incoming current electrode when measuring the grounding resistance by the three-level method is recorded as the ending point; according to the starting point, the ending point and the current diagram distance between two adjacent unit areas, the current flow path between the incoming current electrode and the outgoing current electrode is obtained by the Dijkstra algorithm; Get eight unit areas adjacent to each unit area; the eight unit areas adjacent to each unit area are two in the horizontal direction, two in the vertical direction, and Four directions; The eight unit areas adjacent to each unit area are recorded as the reference unit areas of each unit area; The degree of current flow from each unit area to the corresponding reference unit area is obtained according to the conductivity between two adjacent unit areas; the degree of current flow is specifically expressed by the formula: In the formula, represents the conductivity per unit area, Indicates the first The conductivity of a reference unit area, Indicates that each unit area is The degree of current flow in a reference unit area; The current map distance is obtained by negative correlation mapping the current flow direction from each unit area to the corresponding reference unit area; the current map distance is specifically expressed by the formula: In the formula, Indicates that each unit area is The degree of current flow in a reference unit area, Indicates that each unit area is The current map distance of the reference unit area, Represents an exponential function with a natural constant as its base.

4. A method for testing components of a generator set according to claim 1, characterized in that: The unit regions with similar conductivity are merged to obtain a plurality of merged regions, including: Several unit areas are randomly selected and recorded as seed points in the process of regional growth. According to the difference in conductivity between the selected seed points and the adjacent unit areas, regional growth is performed through the regional growing algorithm to obtain several areas grown out of the grounding area, which are recorded as several merged areas.

5. A method for testing a generator set device according to claim 1, characterized in that: The method of obtaining the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtaining the current direction proximity factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering vectors of all unit areas in the current flow path, comprises: The unit area with the largest conductivity among the eight unit areas adjacent to each unit area is recorded as the largest unit area in the neighborhood. According to each unit area and the largest unit area in the neighborhood, the current conduction vector of each unit area is obtained; wherein the magnitude of the current conduction vector is the difference between the conductivity of the largest unit area in the neighborhood and the conductivity of each unit area, and the direction of the current conduction vector is from the center point of each unit area to the center point of the largest unit area in the neighborhood; wherein the magnitude of the current conduction vector is mapped on ;in, 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 recording the vector after the operation as the total current steering 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 recording the vector after the operation as the path current steering vector; The current direction proximity factor of each merged region is obtained by the direction difference between the total current steering vector of each merged region and the path current steering vector; the current direction proximity factor is specifically expressed by the formula: In the formula, Indicates The angle between the total current steering vector of the merged region and the path current steering vector is express The cosine value of Indicates The current direction of the merged region is close to the factor, represents the linear normalization function.

6. A method for testing a generator set device according to claim 1, characterized in that: The method 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: In the formula, Indicates The area of ​​the merged region, Indicates the current flow path in The length of the merged region, Indicates The current direction of the merged region is close to the factor, Indicates Corrected current direction approach factor for each merged region; represents the linear normalization function.

7. A method for testing components of a generator set according to claim 1, characterized in that: The overall conductivity of the grounding area is calculated based on the relationship between conductivity and grounding resistance according to the overall grounding resistance; the soil heterogeneity is obtained according to the difference in conductivity of all combined areas, including: The non-uniformity is specifically expressed by the formula: In the formula, Indicates The mean value of the conductivity of all unit areas in the merged area, represents the mean value of the conductivity of all unit areas in all merged regions, is the absolute value symbol, Indicates the heterogeneity of the soil; The relationship between conductivity and ground resistance is specifically expressed by the formula: In the formula, represents the overall ground resistance, represents the calculated overall conductivity, Indicates the length of the grounding resistor, is the ratio of pi.

8. A method for testing components of a generator set according to claim 1, characterized in that: The method adjusts 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 real grounding resistance, including: In the formula, represents the mean value of the conductivity of all unit areas in all merged regions, represents the calculated overall conductivity, Indicates the heterogeneity of the soil. represents the mean of the corrected current direction approach factors of all merged regions, Indicates the length of the grounding resistor, represents the linear normalization function, Represents the actual ground resistance, is the circumference of a circle, is the absolute value symbol, Represents the sign function, which is used to determine the positive and negative signs.

9. A generator set component testing system, characterized in that: include: Data acquisition module: used to measure the area corresponding to the current electrode when the grounding resistance is measured using the three-level method, record it as the grounding area, divide the grounding area into several unit areas, and obtain the conductivity of each unit area; Current path planning module: used to obtain the current flow path between two current electrodes in the three-level method measurement according to the conductivity difference between adjacent unit areas; Local area analysis module: used to merge unit areas with similar conductivity to obtain several merged areas; obtain the current conduction vector of each unit area according to the conductivity difference between each unit area and the adjacent unit area, and obtain the current direction proximity factor of each merged area according to the difference between the current steering vectors of all unit areas in each merged area and the current steering 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; Safety test analysis module: used to directly obtain the overall grounding resistance through the three-level method, and calculate the overall conductivity of the grounding area based on the overall grounding resistance through the relationship between conductivity and grounding resistance; obtain the soil heterogeneity based on the difference in conductivity of all combined areas; According to the corrected current direction approach factor of each merged area and the non-uniformity of the soil, the calculated overall conductivity of the grounding area is adjusted to obtain the real grounding resistance; the analysis and test of the grounding device is completed through the real grounding resistance.

10. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements a generator set component testing method as claimed in any one of claims 1 to 8 when executing the computer program.

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