Method and device for determining electric leakage position of power equipment and storage medium

Abstract

The invention discloses a method and a device for determining an electric leakage position of power equipment, and a storage medium, and relates to the technical field of power dispatching. The method comprises the steps that electric leakage potentials of power equipment at multiple positions in a to-be-detected area are acquired, and the electric leakage potentials are differences among potentials generated at the multiple positions in the process that current passes through the to-be-detected area; based on the electric leakage potential, a target detection area is determined in the to-be-detected area, and the target detection area comprises an area formed by the position where the electric leakage potential larger than the potential threshold value is located; based on the target detection area and the electric leakage potential, a positioning model is established, and the positioning model is used for positioning an electric leakage position corresponding to the electric leakage potential; based on the positioning model, a target electric leakage position in the target detection area is determined, and the target electric leakage position is used for representing the position where the electric power equipment generates leakage current in the target detection area. The technical problem that the positioning precision of the electric leakage position of the power equipment is low is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of leakage detection, and in particular to a method, a device and a storage medium for determining the leakage position of an electric power device. Background Art

[0002] At present, power equipment may encounter water during operation, such as rainfall, floods, or water accumulation inside the equipment. This situation will cause leakage in the equipment, posing a serious threat to the safe operation of the power system. Leakage in power equipment will not only cause equipment failure and shutdown, but may also cause electric shock accidents, endangering personal safety and equipment stability. Therefore, timely and effective detection and location of leakage points is a key task to ensure the safety of the power system.

[0003] In the related art, electrical equipment in a water-related environment is prone to problems such as reduced insulation performance and poor grounding, which can lead to leakage. In reality, due to the wide distribution of electrical equipment, leakage points after water exposure may not be easy to be quickly discovered and located. Traditional manual inspection methods are time-consuming and inefficient, and it is difficult to cope with sudden leakage faults. In addition, since electrical equipment is often in complex environments, such as substations, underground equipment rooms, etc., humidity and other environmental factors have a great impact on detection, and leakage points may be distributed in various parts of the equipment or even inside the equipment, making it difficult for traditional methods to accurately locate them. Therefore, there is a technical problem of low positioning accuracy of the leakage position of electrical equipment.

[0004] With respect to the above-mentioned technical problem of low positioning accuracy of the leakage position of the electric power equipment, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, a device and a storage medium for determining a leakage position of an electric device, so as to at least solve the technical problem of low positioning accuracy of the leakage position of the electric device.

[0006] According to one aspect of an embodiment of the present invention, a method for determining the leakage position of an electric device is provided. The method may include: obtaining the leakage potential of the electric device at multiple positions in the area to be detected, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; based on the leakage potential, determining a target detection area in the area to be detected, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; based on the target detection area and the leakage potential, establishing a positioning model, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; based on the positioning model, determining the target leakage position in the target detection area, wherein the target leakage position is used to indicate the position where the electric device generates leakage current in the target detection area.

[0007] Optionally, based on the leakage potential, a target detection area is determined in the area to be detected, including: comparing the leakage potentials of various positions to obtain a comparison result; based on the comparison result, determining an initial detection area, wherein the initial detection area is used to indicate an area composed of four positions with the largest comparison results in the area to be detected; dividing the initial detection area to obtain multiple detection sub-areas; and based on the detection sub-areas, determining a target detection area in the area to be detected.

[0008] Optionally, based on the detection sub-area, a target detection area is determined in the area to be detected, including: performing difference operations on leakage potentials corresponding to multiple positioning points of the detection sub-area to obtain multiple difference results; based on the difference results, determining the target detection area in the area to be detected.

[0009] Optionally, based on the difference result, determining a target detection area of ​​the area to be detected includes: in response to the difference result being greater than a difference result threshold, determining an area consisting of multiple positioning points corresponding to the leakage potential as the target detection area.

[0010] Optionally, a positioning model is established based on the target detection area and the leakage potential, including: obtaining a distance model, wherein the distance model is a model pre-established using environmental information of the area to be detected, the location of the leakage device and performance parameters of the leakage device; determining multiple positioning points of the target detection area; and establishing a positioning model based on the positioning points, the leakage potential and the distance model.

[0011] Optionally, based on the positioning model, the target leakage position within the target detection area is determined, including: obtaining the weight of each positioning point in the target detection area, wherein the weight is used to indicate the importance of the positioning point in the target detection area; inputting the weight into the positioning model for analysis to obtain the target leakage position within the target detection area.

[0012] According to another aspect of an embodiment of the present invention, a device for determining the leakage position of an electric device is also provided. The device may include: an acquisition unit, used to acquire the leakage potential of the electric device at multiple positions in the area to be detected, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; a first determination unit, used to determine a target detection area in the area to be detected based on the leakage potential, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; an establishment unit, used to establish a positioning model based on the target detection area and the leakage potential, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; a second determination unit, used to determine a target leakage position in the target detection area based on the positioning model, wherein the target leakage position is used to indicate the position where the electric device generates leakage current in the target detection area.

[0013] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, which includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining the leakage position of the power equipment in the embodiment of the present invention.

[0014] According to another aspect of an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein when the program is run, the method for determining the leakage position of the power equipment in the embodiment of the present invention is executed.

[0015] According to another aspect of the embodiments of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining the leakage position of the power equipment in the embodiments of the present invention is implemented.

[0016] In an embodiment of the present invention, the leakage potential of the electric device at multiple positions in the area to be detected is obtained, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; based on the leakage potential, a target detection area is determined in the area to be detected, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; based on the target detection area and the leakage potential, a positioning model is established, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; based on the positioning model, a target leakage position in the target detection area is determined, wherein the target leakage position is used to indicate the position where the electric device generates leakage current in the target detection area. That is to say, the present invention determines the target detection area through the leakage potential of the electric device at multiple positions in the area to be detected, thereby establishing a positioning model based on the target detection area and the leakage potential, and using the positioning model, further determining the target leakage position in the target detection area, thereby solving the technical problem of low positioning accuracy of the leakage position of the electric device, and achieving the technical effect of improving the positioning accuracy of the leakage position of the electric device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a method for determining a leakage position of an electric power device according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of preliminary positioning sub-area division according to an embodiment of the present invention;

[0020] FIG3 is a schematic diagram of a potential difference focusing sub-region according to an embodiment of the present invention;

[0021] Figure 4 is a flow chart of a method for locating leakage points of water-related equipment according to an embodiment of the present invention;

[0022] Figure 5 2 is a schematic diagram of a device for determining a leakage position of an electric power device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] 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.

[0024] 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, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0025] According to an embodiment of the present invention, an embodiment of a method for determining the leakage location of an electrical device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0026] Figure 1 is a flow chart of a method for determining a leakage position of an electric power device according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0027] Step S101, obtaining leakage potentials of electrical equipment at multiple locations within a region to be detected.

[0028] In the technical solution provided in the above step S101 of the present invention, the leakage potential is the difference between the potentials generated at multiple positions when the current passes through the area to be detected.

[0029] In this embodiment, the leakage potential of the power device at multiple locations in the area to be detected is obtained. For example, the leakage potential of the power device at multiple locations in the area to be detected is obtained by using a detection device. This is only an illustrative example and does not limit the specific method of obtaining the leakage potential of the power device at multiple locations in the area to be detected.

[0030] Step S102: determining a target detection area in the area to be detected based on the leakage potential.

[0031] In the technical solution provided in the above step S102 of the present invention, the target detection area includes an area consisting of positions where the leakage potential greater than the potential threshold is located.

[0032] In this embodiment, after the leakage potentials of the electric power equipment at multiple locations in the area to be detected are acquired in step S101, the leakage potentials are compared to determine a target detection area in the area to be detected.

[0033] Optionally, the leakage potentials at various positions are compared to obtain comparison results; the four positions with the largest comparison results in the area to be detected are determined through the comparison results, and the area consisting of the four positions is determined as the initial detection area. The initial detection area can also be called the area to be located.

[0034] For example, Figure 2 is a schematic diagram of a preliminary positioning sub-region division according to an embodiment of the present invention, such as Figure 2 As shown, in the area to be positioned, four different reference points A, B, C, and D with large leakage potential detection values ​​and which can form a square are selected, and are sequentially connected to form a square initial detection area.

[0035] Optionally, after the initial detection area is determined, the initial detection area is segmented to obtain a plurality of detection sub-areas, wherein the detection sub-areas may also be referred to as sub-areas.

[0036] For example, Figure 2 As shown, in the initial detection area, the square area can be divided into four sub-areas P1, P2, P3, and P4 by taking the midpoints M1, M2, M3, and M4 of the four sides of the square ABCD and drawing perpendicular lines through the midpoints.

[0037] Optionally, after determining the detection sub-area, based on the negative correlation between the magnitude of the leakage potential and the distance from the leakage device, a difference operation is performed on the leakage potentials corresponding to multiple positioning points within the detection sub-area to determine the difference result. When the difference result is greater than the difference result threshold, the area consisting of the multiple positioning points corresponding to the leakage potential can be determined as the target detection area.

[0038] For example, FIG3 is a schematic diagram of a potential difference focusing sub-area according to an embodiment of the present invention. As shown in FIG3, the leakage potential received at the midpoints of the four sides of two opposite squares is differentiated. Taking the two points M1 and M3 in the figure as an example, if the difference between the leakage potential of the positioning point M1 and the leakage potential of the positioning point M3 is greater than zero, that is, the difference result is greater than the difference result threshold, it indicates that the positioning point is closer to the M1 point than the M3 point, then there is reason to believe that the positioning point is more likely to be located in the P1 and P2 areas. At this time, the leakage potential difference between the two points M2 and M4 can be selected for judgment. If the leakage potential difference between the positioning point M2 and the positioning point M4 is greater than zero, that is, the judgment result shows that the positioning point is closer to M2, then P1 can be further determined as the target detection area.

[0039] Step S103: establishing a positioning model based on the target detection area and the leakage potential.

[0040] In the technical solution provided in the above step S103 of the present invention, the positioning model is used to locate the leakage position corresponding to the leakage potential.

[0041] In this embodiment, after the target detection area is determined in step S102, a positioning model is established using the target detection area and the leakage potential.

[0042] Optionally, a mathematical relationship between the leakage potential and the distance of the leakage device, ie, a distance model, is established according to the actual leakage working environment of the power equipment, the location of the leakage device and performance parameters.

[0043] Optionally, after determining the distance model, an error vector and a weight matrix are introduced, and the distance model is used to determine multiple positioning points in the target detection area, so that a positioning model is established based on the positioning points, leakage potential and distance model. The establishment of the specific positioning model is shown in the following example.

[0044] For example, a plane rectangular coordinate system is established. Taking the P1 region in FIG3 as an example, the four vertices A, M1, M2, and O of the P1 sub-region that are initially screened and focused are set as anchor nodes, and their coordinate distribution is X=(x i ,y i ), i = 1, 2, 3, 4, and using the mathematical relationship between the leakage potential and the distance between the leakage points, it can be known that the distances between these anchor nodes and the position node X = (x, y) to be located are r i, i = 1, 2, 3, 4, then the following positioning model can be established, that is, equation group (1):

[0045]

[0046] Step S104: determining the target leakage position in the target detection area based on the positioning model.

[0047] In the technical solution provided in the above step S104 of the present invention, the target leakage position is used to indicate the position where the electrical equipment generates leakage current in the target detection area.

[0048] In this embodiment, after the positioning model is determined in step S103, the target leakage position in the target detection area is solved using the positioning model. For example, an error vector and a weight matrix are introduced, and the positioning model is solved using a weighted least squares method to determine the target leakage position.

[0049] Optionally, considering that the measurement accuracy of different measurement points may be different and the errors existing in the positioning and ranging process have different effects on different data points, a weight matrix W is introduced. The weighted least squares method can reduce the impact of ranging errors on positioning results.

[0050] It should be noted that the above embodiments can be implemented by a device for determining the leakage position of an electric power device.

[0051] In the above steps S101 to S104 of the present invention, the leakage potential of the power equipment at multiple positions in the area to be detected is obtained, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; based on the leakage potential, a target detection area is determined in the area to be detected, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; based on the target detection area and the leakage potential, a positioning model is established, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; based on the positioning model, a target leakage position in the target detection area is determined, wherein the target leakage position is used to indicate the position where the power equipment generates leakage current in the target detection area. That is to say, the present invention determines the target detection area through the leakage potential of the power equipment at multiple positions in the area to be detected, thereby establishing a positioning model based on the target detection area and the leakage potential, and using the positioning model, further determining the target leakage position in the target detection area, thereby solving the technical problem of low positioning accuracy of the leakage position of the power equipment, and achieving the technical effect of improving the positioning accuracy of the leakage position of the power equipment.

[0052] The above method of this embodiment is further introduced below.

[0053] As an optional implementation method, based on the leakage potential, a target detection area is determined in the area to be detected, including: comparing the leakage potential of each position to obtain a comparison result; based on the comparison result, determining an initial detection area, wherein the initial detection area is used to indicate an area composed of four positions with the largest comparison results in the area to be detected; dividing the initial detection area to obtain multiple detection sub-areas; based on the detection sub-areas, determining the target detection area in the area to be detected.

[0054] In this embodiment, the leakage potentials at various positions are compared to obtain a comparison result. In the area to be detected, an area consisting of four positions with the largest comparison results is selected as an initial detection area.

[0055] Optionally, the initial detection area is evenly divided into multiple detection sub-areas; for example, Figure 2 As shown, the midpoints M1, M2, M3, and M4 of the four sides of the square are taken respectively and vertical lines are drawn through the midpoints to divide the square area into four sub-areas P1, P2, P3, and P4 for detection sub-areas. Thus, the target detection area is determined in the area to be detected by performing difference comparison on the detection sub-areas again.

[0056] As an optional implementation method, based on the detection sub-area, a target detection area is determined in the area to be detected, including: performing difference operations on the leakage potentials corresponding to multiple positioning points of the detection sub-area to obtain multiple difference results; based on the difference results, the target detection area is determined in the area to be detected.

[0057] In this embodiment, the leakage potentials corresponding to the multiple positioning points in the detection sub-area are respectively subjected to difference calculation to obtain multiple difference results. For example, the difference result between point P1 and point P3 can be expressed as φ 1,3 .

[0058] Optionally, the difference result is further judged to determine the target detection area in the area to be detected.

[0059] As an optional embodiment, based on the difference result, a target detection area of ​​the area to be detected is determined, including: in response to the difference result being greater than a difference result threshold, determining an area consisting of multiple positioning points corresponding to the leakage potential as the target detection area.

[0060] In this embodiment, the magnitude of the leakage potential is negatively correlated with the distance from the leakage device. It can be seen that the smaller the distance to the leakage point, the greater the leakage potential that can be detected. Based on this, when the difference result is greater than the difference result threshold, the area composed of multiple positioning points corresponding to the leakage potential is determined as the target detection area.

[0061] For example, as shown in Figure 3, assuming that the difference result threshold is 0, when φ 1,3>0,φ 2,4 >0, the target detection area is determined to be P1; when φ 1,3 >0,φ 2,4 <0, the target detection area is determined to be P2; when φ 1,3 <0,φ 2,4 >0, the target detection area is determined to be P3; when φ 1,3 <0,φ 2,4 <0, the target detection area is determined to be P4.

[0062] As an optional implementation method, a positioning model is established based on the target detection area and the leakage potential, including: obtaining a distance model, wherein the distance model is a model pre-established using environmental information of the area to be detected, the location of the leakage device, and the performance parameters of the leakage device; determining multiple positioning points of the target detection area; and establishing a positioning model based on the positioning points, the leakage potential, and the distance model.

[0063] In this embodiment, a distance model is acquired, the distance model is solved, and a plurality of positioning points in the target detection area are determined; thereby, the positioning points, the leakage potential and the distance model are analyzed to establish a positioning model.

[0064] Optionally, a specific method for establishing a positioning model is as shown in the above formula (1), which will not be described in detail here.

[0065] As an optional implementation method, based on the positioning model, the target leakage position in the target detection area is determined, including: obtaining the weight of each positioning point in the target detection area, wherein the weight is used to indicate the importance of the positioning point in the target detection area; inputting the weight into the positioning model for analysis to obtain the target leakage position in the target detection area.

[0066] In this embodiment, the weights of each positioning point in the target detection area, that is, the weight matrix, are obtained; the weights are input into the positioning model for solution analysis to obtain the target leakage position in the target detection area.

[0067] For example, define the weight matrix W: This is a diagonal matrix, and each diagonal element wi represents the weight of the i-th data point. The larger the weight, the greater the influence of the observation on the final estimation result. The form of the weight matrix W is shown in the following matrix (2):

[0068]

[0069] Select weight wi: The weight wi is usually selected as the inverse of the variance of the measurement error, as shown in the following formula (3):

[0070]

[0071] in, is the measurement error variance associated with the ith measurement point. The variance of the leakage potential error at the same point can be calculated by measuring the potential at the same point multiple times. Measurement points with smaller errors will receive larger weights, while points with larger errors will receive smaller weights. Construct a weighted objective function: minimize the weighted sum of squared errors, as shown in the following formula (4):

[0072]

[0073] Solve the regular equation: Take the derivative of the above equation and set the derivative to zero, and you can get the regular equation of the weighted least squares method as shown in the following formula (5):

[0074] A T WAX=A T WB (5)

[0075] Solve X: Under the condition that the matrix A is full rank, the equation has a unique solution, which is shown in the following formula (6):

[0076] X=(A T WA) -1 A T WB (6)

[0077] It should be noted that the above embodiments can be implemented by a device for determining the leakage position of an electric power device.

[0078] In this embodiment, the leakage potential of the electric device at multiple positions in the area to be detected is obtained, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; based on the leakage potential, a target detection area is determined in the area to be detected, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; based on the target detection area and the leakage potential, a positioning model is established, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; based on the positioning model, a target leakage position in the target detection area is determined, wherein the target leakage position is used to indicate the position where the electric device generates leakage current in the target detection area. That is to say, the present invention determines the target detection area through the leakage potential of the electric device at multiple positions in the area to be detected, thereby establishing a positioning model based on the target detection area and the leakage potential, and using the positioning model, further determining the target leakage position in the target detection area, thereby solving the technical problem of low positioning accuracy of the leakage position of the electric device, and achieving the technical effect of improving the positioning accuracy of the leakage position of the electric device.

[0079] The technical solution of the embodiment of the present invention is illustrated below in conjunction with preferred implementation modes.

[0080] At present, power equipment may encounter water during operation, such as rainfall, floods, or water accumulation inside the equipment. This situation will cause leakage in the equipment, posing a serious threat to the safe operation of the power system. Leakage in power equipment will not only cause equipment failure and shutdown, but may also cause electric shock accidents, endangering personal safety and equipment stability. Therefore, timely and effective detection and location of leakage points is a key task to ensure the safety of the power system.

[0081] In the related art, electrical equipment in a water-related environment is prone to problems such as reduced insulation performance and poor grounding, which can lead to leakage. In reality, due to the wide distribution of electrical equipment, leakage points after water wading may not be easy to be quickly discovered and located. Traditional manual inspection methods are time-consuming and inefficient, and it is difficult to cope with sudden leakage faults. In addition, since electrical equipment is often in a complex environment, such as a substation, underground equipment room, etc., humidity and other environmental factors have a great impact on detection, and leakage points may be distributed in various parts of the equipment, or even inside the equipment, and traditional methods are difficult to accurately locate. Therefore, there is a technical problem of low positioning accuracy of the leakage position of electrical equipment. With respect to the above-mentioned technical problem of low positioning accuracy of the leakage position of electrical equipment, no effective solution has yet been proposed.

[0082] However, the embodiment of the present invention proposes a method for locating the leakage point of water-related equipment, which uses the negative correlation between leakage potential and distance, that is, the farther away from the leakage equipment, the smaller the leakage potential that can be detected, and analogy with the negative correlation between signal strength and distance, using mathematical geometry as a preliminary positioning screening method, and then using a multilateral positioning algorithm for further positioning, introducing error vectors and adding weight matrices and weight selection to the traditional multilateral positioning algorithm, so that it can use the weighted minimum binary method to further accurately locate and complete the positioning of the leakage point of the leakage equipment. Thereby solving the technical problem of low positioning accuracy of the leakage position of the power equipment, and achieving the technical effect of improving the positioning accuracy of the leakage position of the power equipment.

[0083] The embodiments of the present invention are further described below.

[0084] Figure 4 : is a flow chart of a method for locating leakage points of water-related equipment according to an embodiment of the present invention. The analysis method comprises the following steps:

[0085] Step S401: a detection device receives a leakage potential.

[0086] In this embodiment, the leakage potential in the leakage area is detected and received by using a detection device.

[0087] Step S402: whether the leakage potential point is greater than 4.

[0088] In this embodiment, it is determined whether the leakage potential point is greater than 4. If so, step S403 is executed; otherwise, step S401 is executed.

[0089] Step S403: whether a square is formed.

[0090] In this embodiment, it is determined whether the leakage potential points form a square, and if so, step S404 is executed, and if not, step S401 is executed.

[0091] Step S404, establishing a mathematical relationship between electric potential and distance.

[0092] In this embodiment, according to the actual leakage working environment of the power equipment, the location and performance parameters of the leakage equipment, and multiple test records, a mathematical relationship between the leakage potential and the distance of the leakage equipment is established.

[0093] Step S405, calculating the leakage potential difference between the reference points.

[0094] In this embodiment, as shown in FIG3 , the difference of the leakage potential received at the midpoints of the four sides of two opposite squares can be used to determine the proximity of the positioning point to the reference point. Taking the two points M1 and M3 in the figure as an example, if the leakage potential of point M1 is greater than the leakage potential of point M3, that is, the leakage potential difference is greater than zero, indicating that the positioning point is closer to point M1 than point M3, then there is reason to believe that the positioning point is more likely to be located in the P1 and P2 areas. At this time, you can choose to calculate the leakage potential difference between points M2 and M4 for judgment. If the judgment result shows that the positioning point is closer to M2, you can further focus on the sub-area where the positioning point is located as P1. Similarly, if the leakage potential difference between points M1 and M3 is less than zero, the positioning point is more likely to be located in the P3 and P4 areas.

[0095] Step S406, focusing on the sub-area according to the leakage potential difference value.

[0096] In this embodiment, focusing is performed on sub-regions according to the leakage potential difference value.

[0097] Optionally, when φ 1,3 >0,φ 2,4 >0, the sub-region is determined to be P1; when φ 1,3 >0,φ 2,4 <0, the sub-region is determined to be P2; when φ 1,3 <0,φ 2,4 >0, the sub-region is determined to be P3; when φ 1,3 <0,φ 2,4 <0, the sub-region is determined to be P4.

[0098] Step S407: setting the determined sub-region as the target region.

[0099] In this embodiment, the sub-region determined in step S403 is set as the target region.

[0100] Step S408, establishing a group of position node equations.

[0101] In this embodiment, a group of position node equations is established, that is, after completing the preliminary positioning screening, a plane rectangular coordinate system is established.

[0102] Optionally, taking the P1 region as an example, the four vertices A, M1, M2, and O of the P1 sub-region that are initially screened and focused are set as anchor nodes, and their coordinate distribution is X=(x i ,y i ), i = 1, 2, 3, 4, and using the mathematical relationship between the leakage potential and the distance between the leakage points, it can be known that the distances between these anchor nodes and the position node X = (x, y) to be located are r i , i = 1, 2, 3, 4, then the following equation group (1) can be established, which will not be repeated here.

[0103] Optionally, to simplify the calculation, the last equation is subtracted from the first equation, so that the square terms of the unknown position node coordinates in the equation group can be eliminated, and the following three-dimensional linear equation group (7) is obtained:

[0104]

[0105] At this time, the matrix representation of the equation system is: AX = B, where the coefficient matrix A and the vector matrix B are shown in the following matrix (8) and matrix (9):

[0106]

[0107] The unknown location node X can be expressed as the following formula (10):

[0108]

[0109] Step S409, introducing the error vector and weight matrix.

[0110] In this embodiment, due to the measurement error, the actual linear equation system should be expressed as AX+N=B, where N is a 3-dimensional random error vector. For this linear equation system, the least squares principle can be used to minimize the square of the random error vector N=B-AX norm, that is: ||N|| 2 =(B-AX) T (B-AX) is minimized, thus ensuring that the ranging error has the least impact on the positioning result.

[0111] Step S410: Determine the positioning point using the weighted least squares method.

[0112] In this embodiment, considering that the measurement accuracy of different measurement points may be different and the errors existing in the positioning and ranging process have different effects on different data points, it is necessary to introduce a weight matrix W. The main difference between the weighted least squares method and the ordinary least squares method is that it weights the sum of the squares of the error vector N, aiming to reduce the impact of the ranging error on the positioning result.

[0113] Optionally, define a weight matrix W: This is a diagonal matrix, and each diagonal element wi represents the weight of the i-th data point. The larger the weight, the greater the influence of the observation on the final estimation result. The form of the weight matrix W is shown in the above matrix (2), which will not be repeated here.

[0114] Optionally, select the weight wi: The weight wi is usually selected as the inverse of the variance of the measurement error, as shown in the above formula (3). The variance of the leakage potential error of the same point can be calculated by measuring the potential at the same point multiple times. The measurement point with smaller error will get a larger weight, while the point with larger error will get a smaller weight. Construct a weighted objective function: minimize the weighted error sum of squares, as shown in the above formula (4), which will not be repeated here.

[0115] Optionally, solve the regular equation: By differentiating the above equation and setting the derivative to zero, the regular equation of the weighted least squares method can be obtained as shown in the above formula (5), which will not be repeated here.

[0116] Optionally, solve X: Under the condition that the matrix A is full rank, the equation has a unique solution, which is shown in the above formula (6) and will not be repeated here.

[0117] In this embodiment, the negative correlation between leakage potential and distance is used, that is, the farther away from the leakage device, the smaller the leakage potential that can be detected is, and the signal strength and distance are also negatively correlated. Mathematical geometry is used as a preliminary positioning screening method, and then a multilateral positioning algorithm is used for further positioning. The error vector is introduced and the weight matrix and weight selection are added to the traditional multilateral positioning algorithm, so that it can be further accurately positioned using the weighted minimum binary method to complete the positioning of the leakage point of the leakage device. Thereby solving the technical problem of low positioning accuracy of the leakage position of the power equipment, and achieving the technical effect of improving the positioning accuracy of the leakage position of the power equipment.

[0118] According to an embodiment of the present invention, a device for determining a leakage position of an electric device is also provided. It should be noted that the device for determining a leakage position of an electric device can be used to execute the method for determining a leakage position of an electric device in the method embodiment.

[0119] Figure 5 Schematic diagram of a device for determining the leakage position of an electric power device according to an embodiment of the present invention. Figure 5 As shown, the device 500 for determining the leakage position of the electric power equipment may include: an acquiring unit 501 , a first determining unit 502 , an establishing unit 503 and a second determining unit 504 .

[0120] The acquisition unit 501 is used to acquire leakage potentials of the power equipment at multiple locations in the area to be detected, wherein the leakage potential is the difference between the potentials generated at multiple locations when the current passes through the area to be detected.

[0121] The first determining unit 502 is configured to determine a target detection area in the area to be detected based on the leakage potential, wherein the target detection area includes an area consisting of positions where the leakage potential is greater than a potential threshold.

[0122] The establishing unit 503 is used to establish a positioning model based on the target detection area and the leakage potential, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential.

[0123] The second determining unit 504 is configured to determine a target leakage position within the target detection area based on the positioning model, wherein the target leakage position is used to indicate a position where the electrical equipment generates leakage current within the target detection area.

[0124] Optionally, the first determination unit 502 may include: a first acquisition module, used to compare the leakage potential of each position to obtain a comparison result; a first determination module, used to determine the initial detection area based on the comparison result, wherein the initial detection area is used to indicate an area composed of four positions with the largest comparison results in the area to be detected; a segmentation module, used to segment the initial detection area to obtain multiple detection sub-areas; and a second determination module, used to determine the target detection area in the area to be detected based on the detection sub-areas.

[0125] Optionally, the second determination module may include: an operation submodule, used to perform difference operations on the leakage potentials corresponding to multiple positioning points in the detection subarea to obtain multiple difference results; and a determination submodule, used to determine the target detection area in the area to be detected based on the difference results.

[0126] Optionally, the determination submodule may also be configured to determine, in response to a difference result being greater than a difference result threshold, an area consisting of a plurality of positioning points corresponding to the leakage potential as a target detection area.

[0127] Optionally, the establishing unit 503 may include: a first acquisition module, used to acquire a distance model, wherein the distance model is a model pre-established using environmental information of the area to be detected, the location of the leakage device and performance parameters of the leakage device; a third determination module, used to determine multiple positioning points of the target detection area; and an establishing module, used to establish a positioning model based on the positioning points, leakage potential and distance model.

[0128] Optionally, the second determination unit 504 may include: a second acquisition module, used to obtain the weights of each positioning point in the target detection area, wherein the weights are used to indicate the importance of the positioning point in the target detection area; and an analysis module, used to input the weights into the positioning model for analysis to obtain the target leakage position in the target detection area.

[0129] In this embodiment, the leakage potential of the electric device at multiple positions in the area to be detected is obtained, wherein the leakage potential is the difference between the potentials generated at multiple positions in the process of current passing through the area to be detected; based on the leakage potential, a target detection area is determined in the area to be detected, wherein the target detection area includes an area composed of positions where the leakage potential is greater than the potential threshold; based on the target detection area and the leakage potential, a positioning model is established, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; based on the positioning model, a target leakage position in the target detection area is determined, wherein the target leakage position is used to indicate the position where the electric device generates leakage current in the target detection area. That is to say, the present invention determines the target detection area through the leakage potential of the electric device at multiple positions in the area to be detected, thereby establishing a positioning model based on the target detection area and the leakage potential, and using the positioning model, further determining the target leakage position in the target detection area, thereby solving the technical problem of low positioning accuracy of the leakage position of the electric device, and achieving the technical effect of improving the positioning accuracy of the leakage position of the electric device.

[0130] According to an embodiment of the present invention, there is further provided a computer-readable storage medium, the storage medium comprising a stored program, wherein the program executes the method for determining the leakage position of the power equipment in the method embodiment.

[0131] According to an embodiment of the present invention, a processor is further provided. The processor is used to run a program, wherein when the program is run, the method for determining the leakage position of the electric power equipment in the method embodiment is executed.

[0132] According to an embodiment of the present invention, a computer program product is further provided. The computer program product includes computer instructions. When the computer instructions are executed by a processor, the method for determining the leakage position of the power equipment in the method embodiment is implemented.

[0133] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0134] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0135] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0136] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0137] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0138] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk, etc., which can store program codes.

[0139] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining the leakage position of an electric power device, characterized in that: include: Acquire leakage potentials of the electrical equipment at multiple locations within the area to be detected, wherein the leakage potential is the difference between potentials generated at the multiple locations during the process of current passing through the area to be detected; Based on the leakage potential, determining a target detection area in the area to be detected, wherein the target detection area includes an area consisting of positions where the leakage potential greater than a potential threshold is located; Establishing a positioning model based on the target detection area and the leakage potential, wherein the positioning model is used to locate the leakage position corresponding to the leakage potential; Based on the positioning model, a target leakage position within the target detection area is determined, wherein the target leakage position is used to indicate a position where the electrical equipment generates leakage current within the target detection area.

2. The method according to claim 1, characterized in that Determining a target detection area in the area to be detected based on the leakage potential includes: Comparing the leakage potentials at the respective positions to obtain a comparison result; Based on the comparison result, determining an initial detection area, wherein the initial detection area is used to indicate an area consisting of four positions with the largest comparison results in the area to be detected; Segmenting the initial detection area to obtain a plurality of detection sub-areas; Based on the detection sub-areas, the target detection area is determined in the area to be detected.

3. The method according to claim 2, characterized in that Determining the target detection area in the area to be detected based on the detection sub-area includes: Performing difference calculations on the leakage potentials corresponding to the multiple positioning points of the detection sub-area to obtain multiple difference results; Based on the difference result, the target detection area is determined in the area to be detected.

4. The method according to claim 3, characterized in that Determining the target detection area of ​​the area to be detected based on the difference result includes: In response to the difference result being greater than a difference result threshold, an area consisting of the plurality of positioning points corresponding to the leakage potential is determined as the target detection area.

5. The method according to claim 1, characterized in that Based on the target detection area and the leakage potential, a positioning model is established, including: Acquire a distance model, wherein the distance model is a model pre-established using environmental information of the area to be detected, the location of the leakage device, and performance parameters of the leakage device; Determine a plurality of positioning points of the target detection area; The positioning model is established based on the positioning point, the leakage potential and the distance model.

6. The method according to any one of claims 1 to 5, characterized in that Determining a target leakage position within the target detection area based on the positioning model includes: Obtaining a weight of each of the positioning points in the target detection area, wherein the weight is used to indicate the importance of the positioning point in the target detection area; The weight is input into the positioning model for analysis to obtain the target leakage position in the target detection area.

7. A device for determining the leakage position of an electric power device, characterized in that: include: An acquisition unit, used to acquire leakage potentials of the electric device at multiple locations within the area to be detected, wherein the leakage potential is a difference between potentials generated at the multiple locations during a process in which current passes through the area to be detected; A first determining unit, configured to determine a target detection area in the area to be detected based on the leakage potential, wherein the target detection area includes an area consisting of positions where the leakage potential greater than a potential threshold is located; An establishing unit, configured to establish a positioning model based on the target detection area and the leakage potential, wherein the positioning model is used to locate a leakage position corresponding to the leakage potential; The second determining unit is configured to determine a target leakage position within the target detection area based on the positioning model, wherein the target leakage position is used to indicate a position where the electrical equipment generates leakage current within the target detection area.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 6.

9. A processor, characterized in that: The processor is used to run a program, wherein the program executes the method according to any one of claims 1 to 6 when running.

10. A computer program product, characterized in that The computer program product comprises computer instructions, which implement the method according to any one of claims 1 to 6 when executed by a processor.

Images