Method, device and storage medium for determining a leakage position of an electrical power device

Abstract

The application discloses a method and device for determining a leakage position of a power equipment and a storage medium, and relates to the technical field of power dispatching. The method comprises the following steps: acquiring leakage potentials of a plurality of positions of the power equipment in a to-be-detected area, wherein the leakage potential is the difference between the potentials generated at the plurality of positions in the process that a current passes through the to-be-detected area; determining a target detection area in the to-be-detected area based on the leakage potentials, wherein the target detection area comprises an area composed of positions with leakage potentials greater than a potential threshold; establishing a positioning model based on the target detection area and the leakage potentials, wherein the positioning model is used for positioning a leakage position corresponding to the leakage potentials; and determining a target leakage position in the target detection area based on the positioning model, wherein the target leakage position is used for representing a position of the power equipment at which a leakage current is generated. The application solves the technical problem of low positioning accuracy of the leakage position of the power equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of leakage detection, in particular to a method and device for determining a leakage position of a power equipment and a storage medium. BACKGROUND

[0002] At present, power equipment may encounter water-logging situations, such as rainfall, flood or internal water accumulation, during operation. Such situations may cause leakage of the equipment, which poses a serious threat to the safe operation of the power system. Leakage of the power equipment not only causes equipment failure and shutdown, but also may cause electric shock accidents, endangering personal safety and equipment stability. Therefore, timely and effective detection and positioning of the leakage point is a key task to ensure the safety of the power system.

[0003] In related technologies, power equipment in a water-logging environment is prone to problems such as reduced insulation performance and poor grounding, which may cause leakage. In reality, due to the wide distribution of power equipment, the leakage point after water-logging may not be easily found and positioned quickly. The traditional manual inspection method is time-consuming and inefficient, and is difficult to cope with sudden leakage failures. In addition, since the power equipment is often in a complex environment, such as a substation or an underground equipment room, humidity and other environmental factors have a great impact on detection, and the leakage point may be distributed in various parts of the equipment, or even inside the equipment, making it difficult to accurately position using traditional methods. Therefore, there is a technical problem of low positioning accuracy of the leakage position of the power equipment.

[0004] In view of the above technical problem of low positioning accuracy of the leakage position of the power equipment, no effective solution has been proposed so far. SUMMARY

[0005] The embodiments of the present application provide a method and device for determining a leakage position of a power equipment and a storage medium, to at least solve the technical problem of low positioning accuracy of the leakage position of the power equipment.

[0006] According to an aspect of the embodiments of the present application, a method for determining a leakage position of a power equipment is provided. The method can include: obtaining a leakage potential of a plurality of positions of the power equipment in a to-be-detected region, wherein the leakage potential is a difference between potentials generated at the plurality of positions in a process in which a current passes through the to-be-detected region; determining a target detection region in the to-be-detected region based on the leakage potential, wherein the target detection region includes a region composed of positions at which the leakage potential is greater than a potential threshold; establishing a positioning model based on the target detection region and the leakage potential, wherein the positioning model is used to position a leakage position corresponding to the leakage potential; and determining a target leakage position in the target detection region based on the positioning model, wherein the target leakage position is used to represent a position at which a leakage current is generated by the power equipment in the target detection region.

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

[0008] Optionally, the target detection area is determined in the to-be-detected area based on the detection sub-areas, including: performing difference value operation on the electric leakage potential corresponding to each positioning point of the detection sub-area to obtain a plurality of difference value results; and determining the target detection area in the to-be-detected area based on the difference value results.

[0009] Optionally, the target detection area of the to-be-detected area is determined based on the difference value results, including: in response to the difference value result being greater than a difference value result threshold, determining a region composed of a plurality of positioning points corresponding to the electric leakage potential as the target detection area.

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

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

[0012] According to another aspect of the embodiment of the present application, a device for determining an electric leakage position of an electric power device is further provided. The device can include: an obtaining unit configured to obtain an electric leakage potential of a plurality of positions of the electric power device in a to-be-detected area, wherein the electric leakage potential is a difference between potentials generated at the plurality of positions in a process in which an electric current passes through the to-be-detected area; a first determining unit configured to determine a target detection area in the to-be-detected area based on the electric leakage potential, wherein the target detection area includes a region composed of positions with an electric leakage potential greater than an electric potential threshold; an establishing unit configured to establish a positioning model based on the target detection area and the electric leakage potential, wherein the positioning model is used to locate an electric leakage position corresponding to the electric leakage potential; and a second determining unit configured to determine a target electric leakage position in the target detection area based on the positioning model, wherein the target electric leakage position is used to indicate a position of the electric power device in the target detection area at which an electric leakage current is generated.

[0013] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which includes a stored program, wherein the program, when executed by a processor, controls the device where the storage medium is located to perform the method for determining the electric leakage position of the power equipment.

[0014] According to another aspect of the embodiments of the present application, a processor is also provided. The processor is configured to execute a program, wherein the program, when executed, performs the method for determining the electric leakage position of the power equipment.

[0015] According to another aspect of the embodiments of the present application, a computer program product is also provided. The program product includes computer instructions, which, when executed by a processor, implement the method for determining the electric leakage position of the power equipment.

[0016] In the embodiments of the present application, the electric leakage potentials of the power equipment at multiple positions in a to-be-detected region are obtained, wherein the electric leakage potential is the difference between the potentials generated at the multiple positions in the process that the current passes through the to-be-detected region; based on the electric leakage potentials, a target detection region is determined in the to-be-detected region, wherein the target detection region includes a region composed of positions where the electric leakage potentials are greater than a potential threshold; based on the target detection region and the electric leakage potentials, a positioning model is established, wherein the positioning model is used to locate the electric leakage position corresponding to the electric leakage potential; and based on the positioning model, a target electric leakage position in the target detection region is determined, wherein the target electric leakage position is used to represent the position of the power equipment where the electric leakage current is generated. That is, the embodiments of the present application determine the target detection region through the electric leakage potentials of the power equipment at multiple positions in the to-be-detected region, and then establish a positioning model according to the target detection region and the electric leakage potentials, and further determine the target electric leakage position in the target detection region by using the positioning model, thereby solving the technical problem of low positioning accuracy of the electric leakage position of the power equipment, and achieving the technical effect of improving the positioning accuracy of the electric leakage position of the power equipment. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0018] Figure 1 FIG. 1 is a flowchart of a method for determining the electric leakage position of the power equipment according to an embodiment of the present application;

[0019] Figure 2 FIG. 2 is a schematic diagram of a preliminary positioning sub-region division according to an embodiment of the present application;

[0020] FIG. 3 is a schematic diagram of a potential difference focusing sub-region according to an embodiment of the present application;

[0021] Figure 4 is a flow chart of a method for locating a leakage point of a wading device according to an embodiment of the present application;

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

[0023] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should fall within the scope of protection of the present application.

[0024] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, functional component or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, functional components or devices.

[0025] According to an embodiment of the present application, an embodiment of a method for determining a leakage position of a power device is provided. It should be noted that the steps shown in the flow chart of the 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 flow chart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0026] Figure 1 is a flow chart of a method for determining a leakage position of a power device according to an embodiment of the present application, as shown in Figure 1 the method can include the following steps:

[0027] Step S101, obtaining the leakage potential of the power device at a plurality of positions in the detection area.

[0028] In the technical solution provided in the step S101 of the present application, the leakage potential is the difference between potentials generated at multiple positions during the current passing through the region to be detected.

[0029] In this embodiment, the leakage potentials of the power equipment at multiple positions in the region to be detected are obtained. For example, the leakage potentials of the power equipment at multiple positions in the region to be detected are obtained by the detection device, which is only an example and does not limit the specific method of obtaining the leakage potentials of the power equipment at multiple positions in the region to be detected.

[0030] In step S102, a target detection region is determined in the region to be detected based on the leakage potentials.

[0031] In the technical solution provided in the step S102 of the present application, the target detection region includes a region composed of positions with leakage potentials greater than a potential threshold.

[0032] In this embodiment, after the leakage potentials of the power equipment at multiple positions in the region to be detected are obtained in step S101, the leakage potentials are compared to determine the target detection region in the region to be detected.

[0033] Optionally, the leakage potentials of the positions are compared to obtain a comparison result, and four positions with the largest comparison result in the region to be detected are determined based on the comparison result, and a region composed of the four positions is determined as an initial detection region. The initial detection region can also be referred to as a region to be positioned.

[0034] For example, Figure 2 is a preliminary positioning sub-region division schematic diagram according to an embodiment of the present application, as shown in Figure 2 In the region to be positioned, different reference points A, B, C, and D with larger leakage potential detection values and capable of forming a square are selected, and are sequentially connected to form an initial detection region of a square.

[0035] Optionally, after the initial detection region is determined, the initial detection region is segmented to obtain multiple detection sub-regions. The detection sub-regions can also be referred to as sub-regions.

[0036] For example, as shown in Figure 2 In the initial detection region, the midpoints M1, M2, M3, and M4 of the four sides of the square ABCD are taken, and vertical lines are drawn through the midpoints, so that the square region can be divided into four sub-regions P1, P2, P3, and P4.

[0037] Optionally, after determining the detection sub-region, the electric leakage potentials of the plurality of positioning points in the detection sub-region are subtracted according to the negative correlation between the electric leakage potential and the distance of the electric leakage device, and a difference result is determined; when the difference result is greater than a difference result threshold, the region composed of the plurality of positioning points corresponding to the electric leakage potential is determined as the target detection region.

[0038] For example, FIG. 3 is a schematic diagram of electric potential subtraction focusing sub-region according to an embodiment of the present application. As shown in FIG. 3, the electric leakage potentials received at the midpoints of the four sides of the two opposite squares are subtracted. Taking points M1 and M3 in the figure as examples, if the difference between the electric leakage potential of the positioning point M1 and the electric 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, and it is reasonable to believe that the positioning point is more likely to be located in the P1 and P2 regions. At this time, the difference between the electric leakage potentials of the M2 and M4 points can be selected to be calculated for judgment. If the difference between the electric leakage potential of the positioning point M2 and the electric leakage potential of the positioning point M4 is greater than zero, that is, the judgment result indicates that the positioning point is closer to the M2, the P1 can be further determined as the target detection region.

[0039] In step S103, a positioning model is established based on the target detection region and the electric leakage potential.

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

[0041] In this embodiment, after determining the target detection region in step S102, a positioning model is established based on the target detection region and the electric leakage potential.

[0042] Optionally, a mathematical relationship between the electric leakage potential and the distance of the electric leakage device is established according to the actual electric leakage working environment, the position and performance parameters of the electric leakage device, that is, a distance model.

[0043] Optionally, after determining the distance model, an error vector and a weight matrix are introduced, and the plurality of positioning points in the target detection region are determined by using the distance model, so as to establish a positioning model according to the positioning point, the electric leakage potential and the distance model. The establishment of the positioning model is shown in the following examples.

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

[0045]

[0046] In step S104, the target electric leakage position in the target detection area is determined based on the positioning model.

[0047] In the technical solution provided in step S104 of the present application, the target electric leakage position refers to the position of the electric power equipment in the target detection area where the electric leakage current is generated.

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

[0049] Optionally, the weight matrix W is introduced considering that the measurement accuracy of different measurement points can be different and the error existing in the positioning and ranging process has different influences on different data points. The weighted least square method can reduce the influence of the ranging error on the positioning result.

[0050] It should be noted that the above embodiment can be executed by an electric leakage position determination device of electric power equipment.

[0051] In the above steps S101 to S104 of the present application, the electric leakage potential of the electric power equipment at a plurality of positions in the to-be-detected area is obtained, wherein the electric leakage potential refers to the difference between the potentials generated at the plurality of positions in the process that the electric current passes through the to-be-detected area; the target detection area is determined in the to-be-detected area based on the electric leakage potential, wherein the target detection area includes a region composed of positions with electric leakage potential greater than the potential threshold; the positioning model is established based on the target detection area and the electric leakage potential, wherein the positioning model is used to locate the electric leakage position corresponding to the electric leakage potential; and the target electric leakage position in the target detection area is determined based on the positioning model, wherein the target electric leakage position refers to the position of the electric power equipment in the target detection area where the electric leakage current is generated. That is, the present application determines the target detection area by using the electric leakage potential of the electric power equipment at a plurality of positions in the to-be-detected area, establishes the positioning model according to the target detection area and the electric leakage potential, and further determines the target electric leakage position in the target detection area by using the positioning model, thereby solving the technical problem of low positioning accuracy of the electric leakage position of the electric power equipment and achieving the technical effect of improving the positioning accuracy of the electric leakage position of the electric power equipment.

[0052] The above method of this embodiment will be further introduced as follows.

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

[0054] In this embodiment, the leakage electric potential of each position is compared to obtain a comparison result. The region composed of four positions with the largest comparison result in the to-be-detected area is selected as the initial detection area.

[0055] Optionally, the initial detection area is evenly segmented into a plurality of detection sub-areas. For example, as shown in FIG. 2, the midpoint M1, M2, M3 and M4 of the four sides of the square are taken respectively, and the square region is divided into four sub-areas P1, P2, P3 and P4, so that the target detection area is determined in the to-be-detected area by further comparing the detection sub-areas. Figure 2

[0056] As an optional embodiment, the target detection area is determined in the to-be-detected area based on the detection sub-areas, including: performing difference value operation on the leakage electric potential corresponding to a plurality of positioning points of the detection sub-areas respectively to obtain a plurality of difference value results; and determining the target detection area in the to-be-detected area based on the difference value results.

[0057] In this embodiment, the leakage electric potential corresponding to a plurality of positioning points of the detection sub-areas is subjected to difference value operation respectively to obtain a plurality of difference value results. For example, the difference value result of P1 and P3 can be expressed as φ 1,3 .

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

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

[0060] In this embodiment, the size of the leakage electric potential is negatively correlated with the distance from the leakage device. It can be known that the smaller the distance from the leakage point is, the larger the detectable leakage electric potential is. Based on this, when the difference value result is greater than the difference value result threshold, the region composed of a plurality of positioning points corresponding to the leakage electric potential is determined as the target detection area.

[0061] For example, as shown in FIG. 3, it is assumed that the difference value result threshold is 0, and when φ 1,3 ​>0, φ 2,4 If φ > 0, the target detection region is determined to be P1; when φ 1,3 >0, φ 2,4 When φ < 0, the target detection area is determined to be P2; when φ 1,3 <0, φ 2,4 When φ > 0, the target detection area is determined to be P3; when φ 1,3 <0, φ 2,4 When <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: acquiring 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 in 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 obtained, the distance model is solved, and multiple positioning points in the target detection area are determined; thereby, the positioning points, leakage potential, and distance model are analyzed to establish a positioning model.

[0064] Optionally, the specific method for establishing the positioning model is as shown in the aforementioned formula (1), and will not be elaborated here.

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

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

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

[0068]

[0069] Choosing the weight wi: The weight wi is usually chosen as the reciprocal of the variance of the measurement error, as shown in the following formula (3):

[0070]

[0071] wherein, is the measurement error variance related to the i-th measurement point, which can be calculated by measuring the potential of the same point for multiple times to obtain the variance of the measurement leakage potential error of the point. The measurement point with smaller error will get a larger weight, and the point with larger error will get a smaller weight. A weighted objective function is constructed: minimizing the weighted error sum of squares, as shown in the following formula (4):

[0072]

[0073] Solving the normal equation: taking the derivative of the above formula and setting the derivative to zero, the normal equation of the weighted least squares method can be obtained, as shown in the following formula (5):

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

[0075] Solving 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 embodiment can be executed by a leakage position determination device of a power device.

[0078] In this embodiment, the leakage potential of the power device at a plurality of positions in the to-be-detected region is obtained, wherein the leakage potential is the difference between the potentials generated at the plurality of positions during the process that the current passes through the to-be-detected region; based on the leakage potential, a target detection region is determined in the to-be-detected region, wherein the target detection region includes a region composed of positions with leakage potential greater than a potential threshold; based on the target detection region 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 region is determined, wherein the target leakage position is used to represent the position of the power device in the target detection region where the leakage current is generated. That is, the present application determines the target detection region through the leakage potential of the power device at a plurality of positions in the to-be-detected region, and then establishes a positioning model according to the target detection region and the leakage potential, and further determines the target leakage position in the target detection region by using the positioning model, thereby solving the technical problem of low positioning accuracy of the leakage position of the power device, and achieving the technical effect of improving the positioning accuracy of the leakage position of the power device.

[0079] The technical solutions of the embodiments of the present application will be illustrated below in conjunction with preferred embodiments.

[0080] Currently, power equipment may encounter water immersion situations during operation, such as rainfall, floods, or internal water accumulation, etc. This situation can cause equipment to have a leakage phenomenon, which poses a serious threat to the safe operation of the power system. The leakage of power equipment not only causes equipment failure and shutdown, but also can cause electric shock accidents, endangering personal safety and equipment stability. Therefore, timely and effective detection and positioning of the leakage point is a key task to ensure the safety of the power system.

[0081] In related technologies, power equipment in a water immersion environment is prone to problems such as reduced insulation performance and poor grounding, which can cause leakage. In reality, due to the wide distribution of power equipment, the leakage point after water immersion may not be easily discovered and located quickly. The traditional manual inspection method is time-consuming and inefficient, and is difficult to cope with sudden leakage failures. In addition, since power 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 the leakage point can be distributed in various parts of the equipment, or even inside the equipment, making it difficult to accurately locate using traditional methods. Therefore, there is a technical problem of low positioning accuracy of the leakage location of power equipment. In view of the above technical problem of low positioning accuracy of the leakage location of power equipment, no effective solution has been proposed so far.

[0082] However, the embodiments of the present application propose a water-immersed equipment leakage point positioning method, which utilizes the negative correlation between leakage potential and distance, i.e. the farther away from the leakage equipment, the smaller the detectable leakage potential, and analogizes the same negative correlation between signal strength and distance, uses mathematical geometric figures as a preliminary positioning screening method, and further uses a multilateral positioning algorithm for further positioning. The error vector is introduced and a weight matrix and weight selection are added to the traditional multilateral positioning algorithm, so that it can further accurately position using a weighted least binary method to complete the positioning of the leakage point of the leakage equipment. Thus, the technical problem of low positioning accuracy of the leakage location of power equipment is solved, and the technical effect of improving the positioning accuracy of the leakage location of power equipment is achieved.

[0083] The embodiments of the present application will be further introduced below.

[0084] Figure 4 is a flowchart of a water-immersed equipment leakage point positioning method according to the embodiments of the present application, and the analysis method includes the following steps:

[0085] Step S401, detecting equipment receives leakage potential.

[0086] In this embodiment, the detection equipment detects and receives the leakage potential in the leakage area.

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

[0088] In this embodiment, it is judged whether the leakage potential point is greater than 4, if greater than 4, step S403 is executed, if not greater than 4, step S401 is executed.

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

[0090] In this embodiment, it is judged whether the leakage potential point forms a square, if a square is formed, step S404 is executed, if not a square is formed, step S401 is executed.

[0091] Step S404, a mathematical relationship between potential and distance is established.

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

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

[0094] In this embodiment, as shown in FIG. 3, the leakage potential received at the midpoint of the four edges of the two opposite squares is subtracted, that is, the proximity of the positioning point to the reference point is judged. Taking points M1 and M3 as an example, if the leakage potential of point M1 is greater than that of point M3, that is, the leakage potential difference is greater than zero, it indicates that the positioning point is closer to M1 than M3, and it is reasonable to believe that the positioning point is more likely to be located in the P1 and P2 regions. At this time, the leakage potential difference of points M2 and M4 can be calculated to judge, if the judgment result shows that the positioning point is closer to M2, the sub-region where the positioning point is located can be further focused on P1. Similarly, if the leakage potential difference of points M1 and M3 is less than zero, the positioning point is more likely to be located in the P3 and P4 regions.

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

[0096] In this embodiment, the sub-region is focused on according to the leakage potential difference.

[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, the determined sub-region is set as a target region.

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

[0100] Step S408, establish the position node equation set.

[0101] In this embodiment, the position node equation set is established, that is, after the preliminary positioning screening is completed, 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 focused by the preliminary screening are set as anchor nodes, the coordinate distribution of which is X=(x i , y i ), i=1, 2, 3, 4, and the mathematical relationship between the leakage potential and the distance of the leakage point is used, and it can be known that the distances between these anchor nodes and the position node X=(x, y) to be positioned are respectively r i , i=1, 2, 3, 4, and the following equation set (1) can be established, which is not repeated here.

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

[0104]

[0105] At this time, the matrix representation of the equation set 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] Where, the unknown position node X can be expressed as the following formula (10):

[0108]

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

[0110] In this embodiment, due to the existence of measurement error, the actual linear equation set should be represented as AX+N=B, where N is a 3-dimensional random error vector. For this linear equation set, the least square method principle can be used to minimize the square of the random error vector N=B-AX, that is: ||N|| 2 =(B-AX) T (B-AX) is minimized, so as to ensure that the ranging error has the minimum influence on the positioning result.

[0111] Step S410, determine the positioning point by using the weighted least square method.

[0112] In this embodiment, considering that the measurement accuracy of different measurement points can be different and the error existing in the positioning and ranging process has different influences on different data points, a weight matrix W needs to be introduced. The main difference between the weighted least square method and the ordinary least square method is that the weighted least square method weights the sum of squares of the error vector N, aiming to reduce the influence of ranging error on the positioning result.

[0113] Optionally, the weight matrix W is defined: it is a diagonal matrix, and each diagonal element wi represents the weight of the i th data point. The greater the weight, the greater the influence of the observation value on the final estimation result. The weight matrix W is in the form shown in the foregoing matrix (2), which will not be described here again.

[0114] Optionally, the weight wi is selected: the weight wi is usually selected as the inverse of the variance of the measurement error, which is specifically shown in the foregoing formula (3), and the variance of the measurement leakage potential error of the same point can be calculated by measuring the potential of the point multiple times. The measurement point with smaller error will have a larger weight, and the point with larger error will have a smaller weight. The weighted objective function is constructed: the weighted error sum of squares is minimized, which is specifically shown in the foregoing formula (4), which will not be described here again.

[0115] Optionally, the normal equation is solved: the derivative of the foregoing formula is taken and the derivative is zero, and the normal equation of the weighted least square method can be obtained, which is specifically shown in the foregoing formula (5), which will not be described here again.

[0116] Optionally, X is solved: under the condition that the matrix A is full rank, the equation has a unique solution, which is shown in the foregoing formula (6), which will not be described here again.

[0117] In this embodiment, the negative correlation between the leakage potential and the distance is utilized, that is, the farther away from the leakage device, the smaller the leakage potential that can be detected, which is analogous to the negative correlation between the signal strength and the distance, a mathematical geometric figure is used as a preliminary positioning screening method, a multilateral positioning algorithm is further used for positioning, an error vector is introduced, and a weight matrix and the selection of the weight are added to the traditional multilateral positioning algorithm, so that the weighted least square method can be further used for accurate positioning, and the positioning of the leakage point of the leakage device is completed. Thus, the technical problem of low positioning accuracy of the leakage position of the power device is solved, and the technical effect of improving the positioning accuracy of the leakage position of the power device is realized.

[0118] According to the embodiment of the present application, a kind of leakage position of power device determination device is also provided.It needs to be explained, the leakage position of power device determination device can be used to execute the leakage position of power device determination method in method embodiment.

[0119] Figure 5 It is a schematic diagram of a kind of leakage position of power device determination device according to the embodiment of the present application.As shown in FIG.Figure 5 As shown, the leakage position determination apparatus 500 of the power equipment can include an acquisition unit 501, a first determination unit 502, an establishment unit 503, and a second determination unit 504.

[0120] The acquisition unit 501 is configured to acquire leakage potentials of the power equipment at multiple positions in a to-be-detected region, wherein the leakage potential is a difference between potentials generated at the multiple positions in the process of current passing through the to-be-detected region.

[0121] The first determination unit 502 is configured to determine a target detection region in the to-be-detected region based on the leakage potentials, wherein the target detection region includes a region composed of positions with leakage potentials greater than a potential threshold.

[0122] The establishment unit 503 is configured to establish a positioning model based on the target detection region and the leakage potentials, wherein the positioning model is used to locate a leakage position corresponding to the leakage potentials.

[0123] The second determination unit 504 is configured to determine a target leakage position in the target detection region based on the positioning model, wherein the target leakage position is used to indicate a position of the power equipment at which a leakage current is generated in the target detection region.

[0124] Optionally, the first determination unit 502 can include a first acquisition module configured to compare the leakage potentials of the positions to obtain a comparison result, a first determination module configured to determine an initial detection region based on the comparison result, wherein the initial detection region is used to indicate a region composed of four positions with the largest comparison result in the to-be-detected region, a segmentation module configured to segment the initial detection region to obtain multiple detection sub-regions, and a second determination module configured to determine the target detection region in the to-be-detected region based on the detection sub-regions.

[0125] Optionally, the second determination module can include a calculation sub-module configured to perform difference calculation on the leakage potentials of multiple positioning points of the detection sub-regions respectively to obtain multiple difference results, and a determination sub-module configured to determine the target detection region in the to-be-detected region based on the difference results.

[0126] Optionally, the determination sub-module can be further configured to determine a region composed of multiple positioning points corresponding to the leakage potentials as the target detection region in response to the difference results being greater than a difference result threshold.

[0127] Optionally, the establishing unit 503 can include a first obtaining module configured to obtain a distance model, wherein the distance model is a model established in advance by using environmental information of the to-be-detected region, a leakage device position, and performance parameters of a leakage device; a third determining module configured to determine a plurality of positioning points of the target detection region; and an establishing module configured to establish a positioning model based on the positioning points, the leakage electric potential, and the distance model.

[0128] Optionally, the second determining unit 504 can include a second obtaining module configured to obtain a weight of each positioning point of the target detection region, wherein the weight is used to represent an importance degree of the positioning point in the target detection region; and an analyzing module configured to input the weight into the positioning model for analysis to obtain the target leakage position in the target detection region.

[0129] In this embodiment, the leakage electric potential of a plurality of positions of the power device in the to-be-detected region is obtained, wherein the leakage electric potential is a difference between electric potentials generated at the plurality of positions in the process that a current passes through the to-be-detected region; the target detection region is determined in the to-be-detected region based on the leakage electric potential, wherein the target detection region includes a region composed of positions with leakage electric potentials greater than an electric potential threshold; the positioning model is established based on the target detection region and the leakage electric potential, wherein the positioning model is used to locate a leakage position corresponding to the leakage electric potential; and the target leakage position in the target detection region is determined based on the positioning model, wherein the target leakage position is used to represent a position of the power device in the target detection region at which a leakage current is generated. That is, the target detection region is determined by the leakage electric potential of the plurality of positions of the power device in the to-be-detected region, so that the positioning model is established according to the target detection region and the leakage electric potential, and the target leakage position in the target detection region is further determined by using the positioning model, thereby solving the technical problem of low positioning accuracy of the leakage position of the power device and achieving the technical effect of improving the positioning accuracy of the leakage position of the power device.

[0130] According to the embodiment of the present application, a computer readable storage medium is also provided, which includes a stored program, wherein the program executes the method for determining the leakage position of the power device in the method embodiment.

[0131] According to the embodiment of the present application, a processor is also provided, which is used to run a program, wherein the program runs to execute the method for determining the leakage position of the power device in the method embodiment.

[0132] According to the embodiment of the present application, a computer program product is also provided, which includes computer instructions, and the computer instructions are executed by a processor to implement the method for determining the leakage position of the power device in the method embodiment.

[0133] The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0134] In the above-mentioned embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0135] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-mentioned device embodiments are only schematic, for example, the division of units can be a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed units can be indirect coupling or communication connection through some interfaces, units or modules, which can be electrical or other forms.

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

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

[0138] If the integrated unit is realized in the form of software functional unit and sold or used as an independent functional component, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the whole or part of the technical solutions which essentially contribute to the prior art can be embodied in the form of software functional components, which are stored in a storage medium and include a plurality of instructions for making a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the embodiments of the present application. The above-mentioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic or optical disk and various program code storage media.

[0139] The above merely is the preferred embodiment of the present application, it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, can also make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method of determining a location of an electric leakage of an electric power device, characterized by, The method comprises the following steps: obtaining leakage potentials of a plurality of positions of an electric power device in a to-be-detected region, wherein the leakage potential is a difference between potentials generated at the plurality of positions during current passing through the to-be-detected region; determining a target detection region in the to-be-detected region based on the leakage potentials; obtaining a distance model, wherein the distance model is a model pre-established by using environmental information of the to-be-detected region, a leakage device position and a performance parameter of the leakage device; determining a plurality of positioning points of the target detection region by using the distance model; establishing a positioning model based on the plurality of positioning points, the leakage potentials and the distance model, wherein the positioning model is used for positioning a leakage position corresponding to the leakage potentials; determining a target leakage position in the target detection region based on the positioning model, wherein the target leakage position is used for representing a position of the electric power device generating a leakage current in the target detection region.

2. The method of claim 1, wherein, The method comprises the following steps: comparing the leakage potentials of the plurality of positions to obtain a comparison result; determining an initial detection region based on the comparison result, wherein the initial detection region is a region formed by four positions with greater leakage potentials in the to-be-detected region and capable of forming a square; segmenting the initial detection region to obtain a plurality of detection sub-regions by respectively obtaining midpoints of four sides of the square and drawing perpendicular lines through the midpoints; determining the target detection region in the to-be-detected region based on the detection sub-regions.

3. The method of claim 2, wherein, The method comprises the following steps: performing difference value operations on the leakage potentials corresponding to two opposite midpoints of the four sides of the square to obtain a plurality of difference value results; focusing on a detection sub-region in which the leakage device is located based on the difference value results, in combination with a negative correlation between the size of the leakage potentials and a distance of the leakage device, and determining the detection sub-region in which the leakage device is located as the target detection region.

4. The method according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: obtaining weights of the plurality of positioning points in the target detection region, wherein the weights are used for representing importance degrees of the plurality of positioning points in the target detection region; inputting the weights into the positioning model for analysis to obtain the target leakage position in the target detection region.

5. An apparatus for determining a location of an electric leakage of an electric power device, characterized by comprising: The method comprises the following steps: an obtaining unit is configured to obtain leakage potentials of a plurality of positions of an electric power device in a to-be-detected region, wherein the leakage potential is a difference between potentials generated at the plurality of positions during current passing through the to-be-detected region; a first determining unit is configured to determine a target detection region in the to-be-detected region based on the leakage potentials; The establishing unit is configured to acquire a distance model, wherein the distance model is a model established in advance by using environmental information of the to-be-detected area, a position of a leakage device, and performance parameters of the leakage device; a plurality of positioning points of the target detection area are determined by using the distance model; and a positioning model is established based on the plurality of positioning points, the leakage electric potential, and the distance model, wherein the positioning model is used to locate a leakage position corresponding to the leakage electric potential. The second determining unit is configured to determine a target leakage position in the target detection area based on the positioning model, wherein the target leakage position is used to represent a position at which the power device generates a leakage current in the target detection area.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program, when executed by a processor, controls a device in which the storage medium is located to perform the method of any one of claims 1 to 4.

7. A processor, comprising: The processor is configured to execute a program, wherein the program, when executed, performs the method of any one of claims 1 to 4.

8. A computer program product, characterised in that, The computer program product comprises computer instructions that, when executed by a processor, implement the method of any one of claims 1 to 4.

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