GIS partial discharge positioning method and device, electronic equipment and storage medium

Abstract

The invention provides a GIS partial discharge positioning method and device, electronic equipment and a storage medium, and the method comprises the steps: building electromagnetic attenuation models of a GIS according to typical structural forms corresponding to the GIS, and enabling the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms to be different; establishing an ultrahigh-frequency partial discharge signal source positioning model of the GIS according to the electromagnetic attenuation model and the number of the linear non-through basin-type insulators; according to the ultrahigh frequency partial discharge signal source positioning model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system, obtaining a map centroid similarity coefficient of the GIS; and comparing the map centroid similarity coefficient with the map similarity coefficient critical value to obtain a partial discharge signal source positioning result of the GIS, so that the partial discharge signal source can be effectively positioned based on the typical structural form of the GIS, the positioning precision is improved, and the problem that the equipment requirement of time difference method positioning is relatively high is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and particularly to a method, device, electronic equipment and storage medium for local discharge positioning of GIS. Background Art

[0002] Gas Insulated Switchgear (GIS) is a high-voltage electrical equipment used in power systems. It uses gas as an insulating medium to isolate and protect various power transmission and distribution components, and has the characteristics of compact structure, safety and reliability, long overhaul period, and being unaffected by the external environment. The stable operation of GIS is closely related to the reliable power transmission of the local power grid. Under actual working conditions, due to foreign object influence, equipment manufacturing process, long-term operation and aging, etc. inside GIS, local discharge phenomena occur, affecting the stable operation. When there is local discharge inside GIS with SF6 gas as insulation, the formed local discharge signal has the characteristics of steep rise, wide frequency spectrum distribution (300 MHz - 1500 MHz), short pulse duration, etc.

[0003] Currently, the discharge analysis of local discharge in GIS mainly focuses on the parameter identification of local discharge signals and the positioning of local discharge signal sources. Currently, the positioning technology for local discharge signal sources mainly processes and analyzes the signal time delay differences at different measurement points. By collecting the wavefront positions of local discharge signal sources, precise positioning is achieved based on the time delay differences of the wavefront positions; however, this method requires the signal acquisition device to have a frequency of up to 10 9 Hz or more, and there are large randomnesses in the extraction results of different signal wavefronts (algorithm system errors, environmental errors "signal-to-noise ratio, electromagnetic interference"), affecting the positioning accuracy. In addition, the high-speed signal acquisition device and the use technology / economic threshold are relatively high. Summary of the Invention

[0004] In view of this, the present application provides a method, device, electronic equipment and storage medium for local discharge positioning of GIS to solve the problems that the existing method requires the signal acquisition device to have a frequency of up to 10 9 Hz or more, there are large randomnesses in the extraction results of different signal wavefronts, affecting the positioning accuracy, and the high-speed signal acquisition device and the use technology / economic threshold are relatively high.

[0005] To achieve the above object, the embodiments of the present invention provide the following technical solutions:

[0006] The first aspect of the present application discloses a method for local discharge positioning of GIS, including:

[0007] Establish an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different;

[0008] Based on the electromagnetic attenuation model and the number of straight-shaped pot insulators, establish the UHF partial discharge signal source localization model for the GIS;

[0009] Based on the UHF partial discharge signal source localization model and the magnitudes of the partial discharge signals at each measurement point in the adjacent measurement point system, obtain the centroid similarity coefficient of the GIS spectrogram;

[0010] Compare the centroid similarity coefficient of the spectrogram with the critical value of the spectrogram similarity coefficient to obtain the localization result of the partial discharge signal source of the GIS.

[0011] Optionally, in the above-mentioned partial discharge localization method for the GIS, based on the typical structural form corresponding to the GIS, establish the electromagnetic attenuation model for the GIS, including:

[0012] Based on the typical structural form corresponding to the GIS, obtain the equivalent cavity structure model for the GIS;

[0013] Based on the equivalent cavity structure model, the dielectric constant data of the GIS, and the mesh division size, obtain the equivalent transmission model for the GIS;

[0014] Based on the equivalent transmission model, the magnitude of the discrete point signal source, the coordinates of the discrete point signal source, and the coordinates of the omnidirectional antenna, perform modeling to obtain the electromagnetic attenuation model for the GIS.

[0015] Optionally, in the above-mentioned partial discharge localization method for the GIS, based on the typical structural form corresponding to the GIS, obtain the equivalent cavity structure model for the GIS, including:

[0016] Based on the inner diameter and outer diameter of the GIS, obtain the shell thickness of the GIS;

[0017] Based on the shell thickness and the geometric center coordinates of the gas insulation medium, obtain the equivalent cavity structure model for the GIS.

[0018] Optionally, in the above-mentioned partial discharge localization method for the GIS, based on the equivalent cavity structure model, dielectric constant data, and mesh division size, obtain the equivalent transmission model for the GIS, including:

[0019] Respectively input the inner conductor dielectric constant, pot insulator dielectric constant, shell dielectric constant, and gas insulation medium dielectric constant and magnetic permeability of the GIS into the equivalent cavity structure model to obtain the inner conductor wave impedance, pot insulator wave impedance, shell wave impedance, and gas insulation medium wave impedance of the GIS;

[0020] An equivalent transmission model of the GIS is obtained according to the inner conductor wave impedance, the pot-type insulator wave impedance, the housing wave impedance, the gas insulation medium wave impedance, and the mesh division size.

[0021] Optionally, in the above partial discharge location method of the GIS, a UHF partial discharge signal source location model of the GIS is established according to the electromagnetic attenuation model and the number of non-uniform pot-type insulators in a straight line form, including:

[0022] The built-in sensor energy gain coefficient and the non-horizontal sensor compensation factor are input into the electromagnetic attenuation model to obtain the sensor amplitude compensation function of the GIS;

[0023] According to the sensor amplitude compensation function and the number of non-uniform pot-type insulators in the straight line form, the UHF partial discharge signal source location model of the GIS is obtained.

[0024] Optionally, in the above partial discharge location method of the GIS, a map centroid similarity coefficient of the GIS is obtained according to the UHF partial discharge signal source location model and the partial discharge signal amplitudes of each measurement point in the adjacent measurement point system, including:

[0025] According to the partial discharge signal amplitudes of each measurement point in the adjacent measurement point system, an amplitude difference decision criterion of the adjacent measurement point system is determined;

[0026] The amplitude difference decision criterion is input into the UHF partial discharge signal source location model to obtain the measurement point map features of the GIS;

[0027] Clustering is performed according to the measurement point map features to obtain the map centroid similarity coefficient of the GIS.

[0028] A second aspect of the present application discloses a partial discharge location device for a GIS, including:

[0029] A first establishment unit for establishing an electromagnetic attenuation model of the GIS according to the corresponding typical structural form of the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different;

[0030] A second establishment unit for establishing a UHF partial discharge signal source location model of the GIS according to the electromagnetic attenuation model and the number of non-uniform pot-type insulators in a straight line form;

[0031] A similarity coefficient unit for obtaining the map centroid similarity coefficient of the GIS according to the UHF partial discharge signal source location model and the partial discharge signal amplitudes of each measurement point in the adjacent measurement point system;

[0032] A comparison unit, configured to compare the centroid similarity coefficient of the spectrogram and the critical value of the spectrogram similarity coefficient, and obtain the positioning result of the partial discharge signal source of the GIS.

[0033] Optionally, in the above-mentioned partial discharge positioning device of the GIS, the first establishing unit is specifically configured to:

[0034] Obtain the equivalent cavity structure model of the GIS according to the typical structural form corresponding to the GIS;

[0035] Obtain the equivalent transmission model of the GIS according to the equivalent cavity structure model, the dielectric constant data, and the mesh division size;

[0036] Perform modeling according to the equivalent transmission model, the amplitude of the discrete point signal source, the coordinates of the discrete point signal source, and the coordinates of the omnidirectional antenna to obtain the electromagnetic attenuation model of the GIS.

[0037] A third aspect of the present application discloses an electronic device, including: a memory and a processor;

[0038] Wherein, the memory is used to store a computer program;

[0039] The processor is used to execute the computer program, and is specifically used to implement the partial discharge positioning method of the GIS as described in any one of the first aspect.

[0040] A fourth aspect of the present application discloses a computer storage medium, which is used to store a computer program. When the computer program is executed, it is specifically used to implement the partial discharge positioning method of the GIS as described in any one of the first aspect.

[0041] The present invention provides a partial discharge positioning method for a GIS, including: establishing an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different; establishing a UHF partial discharge signal source positioning model of the GIS according to the electromagnetic attenuation model and the number of non-through basin insulators in a straight line form; obtaining the centroid similarity coefficient of the spectrogram of the GIS according to the UHF partial discharge signal source positioning model and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system; comparing the centroid similarity coefficient of the spectrogram and the critical value of the spectrogram similarity coefficient to obtain the positioning result of the partial discharge signal source of the GIS, which can effectively locate the partial discharge signal source based on the typical structural form of the GIS, improve the positioning accuracy, and make up for the problem of high equipment requirements for time difference method positioning. Description of the Drawings

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0043] Figure 1 Schematic diagram of partial discharge location of a GIS provided in this application;

[0044] Figure 2 Flowchart of partial discharge location of a GIS provided in an embodiment of this application;

[0045] Figure 3 Schematic diagram of electromagnetic attenuation amount of an electromagnetic attenuation model corresponding to different typical structural forms provided in an embodiment of this application;

[0046] Figure 4 Flowchart of establishing an electromagnetic attenuation model of a GIS provided in an embodiment of this application;

[0047] Figures 5 to 7 Schematic diagram of a positioning model for ultra-high frequency partial discharge signal source provided in an embodiment of this application;

[0048] Figure 8 Flowchart of establishing a positioning model for ultra-high frequency partial discharge signal source provided in an embodiment of this application;

[0049] Figure 9 Flowchart of determining the centroid similarity coefficient of a GIS atlas provided in an embodiment of this application;

[0050] Figure 10 Schematic diagram of the structure of a partial discharge location device for a GIS provided in an embodiment of this application;

[0051] Figure 11 Schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed implementation manners

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0053] First of all, it should be noted that GIS usually includes components such as circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, lightning arresters, and connecting busbars. Taking the insulating gas SF6 as an example, the above components are encapsulated in a grounded metal shell filled with SF6 gas. Such a design makes GIS have a smaller space occupancy rate, higher reliability, fewer maintenance requirements, and better environmental adaptability compared with traditional air-insulated switchgear.

[0054] Based on the above, the embodiment of the present application provides a method for local discharge positioning of GIS to solve the problems that the signal acquisition device required by the existing method has a frequency as high as above 109 Hz, and there is a large randomness in the extraction results of different signal wavefronts, which affects the positioning accuracy, and the high-speed signal acquisition device and the use technology / economic threshold are relatively high.

[0055] Combined with Figure 1 and Figure 2 , Figure 1 the antenna in

[0056] is equivalent to a sensor, and the wave source is equivalent to a local discharge signal source. The method for local discharge positioning of this GIS mainly includes the following steps:

[0057] Among them, the typical structural form at least includes: linear structure, L-shaped structure, Z-shaped structure, T-shaped structure, and portal structure. The electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different. Exemplarily, the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms can be as Figure 3 shown.

[0058] In practice, according to the actual structural form of GIS, the typical structural form corresponding to GIS can be determined, and the electromagnetic attenuation model of GIS can be built to provide support for subsequent electromagnetic attenuation solution and the establishment of a UHF local discharge signal source positioning model.

[0059] In one embodiment, the specific implementation process of step S101, establishing the electromagnetic attenuation model of GIS according to the typical structural form corresponding to GIS, is as Figure 4 shown, mainly including steps S201 to S203:

[0060] S201, according to the typical structural form corresponding to GIS, obtain the equivalent cavity structure model of GIS.

[0061] In practice, the inner diameter and outer diameter of GIS can be obtained according to the typical structural form corresponding to GIS; according to the inner diameter and outer diameter of GIS, the shell thickness of GIS can be obtained; finally, according to the shell thickness and the geometric center coordinates of the gas insulation medium, the equivalent cavity structure model of GIS can be obtained.

[0062] Exemplarily, assuming that the inner diameter of the GIS is R0 and the outer diameter of the GIS is R1, the shell thickness d of the GIS can be calculated by the following formula:

[0063] d = (R1 - R0) / 2.

[0064] It should be noted that according to the electromagnetic transmission mode of the GIS, the conductor diameter r and the geometric center coordinates axisI of the inner conductor input into the GIS are combined with the conductor diameter r to establish the internal structure of the conductor; according to the spatial coordinates axisJ of the geometric center of the shell, the inner diameter R0, and the outer diameter R1, the shell thickness d of the GIS is obtained; the internal structure of the shell is established by combining the geometric center coordinates axisK of the gas insulation medium and the shell thickness d; according to the geometric center coordinates axisK of the gas insulation medium, combined with the conductor diameter r and the shell thickness d, the equivalent model of the GIS is determined.

[0065] Among them, axisI = {(axisIx1, axisIy1, axisIz1), (axisIx2, axisIy2, axisIz2)), (axisIx3, axisIy3, axisIz3)};

[0066] axisJ = {(axisJx1, axisJy1, axisJz1), (axisJx2, axisJy2, axisJz2)), (axisJx3, axisJy3, axisJz3)};

[0067] axisK = {(axisKx1, axisKy1, axisKz1), (axisKx2, axisKy2, axisKz2), (axisKx3, axisKy3, axisKz3)}.

[0068] S202. According to the equivalent cavity structure model, the dielectric constant data of the GIS, and the mesh division size, obtain the equivalent transmission model of the GIS.

[0069] The dielectric constant data of the GIS generally includes the dielectric constant ε1 of the inner conductor, the dielectric constant ε2 of the pot-type insulator, the dielectric constant ε3 of the shell, the dielectric constant ε4 of the gas insulation medium, etc.; of course, it is not limited to this, and it can also be determined according to the application environment and user requirements, and all are within the protection scope of this application.

[0070] During the simulation process of the GIS, the setting of the mesh division size x of the GIS directly affects the calculation accuracy and convergence. Specifically, for the electric field concentration areas of the GIS (such as the conductor edge, the insulator surface), local encryption can be performed; for the interface between the SF6 gas and the solid insulation medium, a high-resolution mesh is required.

[0071] In practice, based on the equivalent cavity structure model, by inputting the dielectric constant data of the GIS and the grid division size, an equivalent transmission model mod of the GIS can be constructed:

[0072] mod = {axisI, axisJ, axisK}.

[0073] In one embodiment, the specific implementation process of step S202, obtaining the equivalent transmission model of the GIS according to the equivalent cavity structure model, the dielectric constant data of the GIS, and the grid division size is as follows, mainly including steps S301 and S302:

[0074] S301: Respectively input the inner conductor dielectric constant, pot insulator dielectric constant, housing dielectric constant, gas insulation medium dielectric constant and magnetic permeability of the GIS into the equivalent cavity structure model to obtain the inner conductor wave impedance, pot insulator wave impedance, housing wave impedance and gas insulation medium wave impedance of the GIS.

[0075] In practice, the wave impedance can be calculated based on the dielectric constant to obtain the inner conductor wave impedance Z1, pot insulator wave impedance Z2, housing wave impedance Z3 and gas insulation medium wave impedance Z4 of the GIS. Among them:

[0076] ;

[0077] ;

[0078] ;

[0079] ;

[0080] ε1 represents the inner conductor dielectric constant of the GIS, ε2 represents the pot insulator dielectric constant of the GIS, ε3 represents the housing dielectric constant of the GIS, ε4 represents the gas insulation medium dielectric constant of the GIS, and μ0 represents the magnetic permeability of the GIS.

[0081] S302: Obtain the equivalent transmission model of the GIS according to the inner conductor wave impedance, pot insulator wave impedance, housing wave impedance, gas insulation medium wave impedance and grid division size.

[0082] In practice, according to the grid division size x and the inner conductor wave impedance, pot insulator wave impedance, housing wave impedance, gas insulation medium wave impedance, the equivalent transmission model mod of the GIS can be obtained:

[0083] mod = {axisI, axisJ, axisK}.

[0084] S203. Model according to the equivalent transmission model, the amplitude of the discrete point signal source, the coordinates of the discrete point signal source, and the coordinates of the omnidirectional antenna to obtain the electromagnetic attenuation model of GIS.

[0085] In the electromagnetic transient simulation of GIS, the setting of the amplitude of the discrete point signal source and the coordinates of the discrete point signal source of GIS needs to consider equipment parameters, insulation characteristics, and simulation purposes.

[0086] It should be noted that according to the equivalent transmission model of GIS, by inputting the amplitude V of the discrete point signal source, the coordinates axis_sig(t) of the discrete point signal source, and the coordinates axis_prob(f) of the omnidirectional antenna for modeling, the electromagnetic attenuation model model(t,f) of GIS can be obtained:

[0087] model(t,f) = {axis_sig(t), axis_prob(f)}.

[0088] It should also be noted that the starting value freq0, the cut-off value freq1, and the number of frequency interval points G of GIS can be set, and the frequency distribution interval freq can be calculated: freq = linspace{freq0, freq1, G}. Based on the frequency distribution interval freq, combined with the equivalent transmission model model(i), by adjusting the positions of the discrete point signal source and the omnidirectional antenna, the electromagnetic attenuation Ampli(m) of different structural forms can be solved:

[0089] .

[0090] S102. Establish the UHF partial discharge signal source localization model of GIS according to the electromagnetic attenuation model and the number of non-through basin insulators in the straight line form.

[0091] Among them, the straight line form usually refers to the busbar or conductor part inside the equipment, which is arranged in a straight line for power transmission and distribution. The non-through basin insulator refers to a basin insulator that is not directly connected or does not have a through hole in the traditional sense. Its main function is to provide mechanical support and ensure electrical insulation performance; different basin insulators are mainly used in specific positions, such as where the conductor needs to be fixed and insulation is provided, but current does not need to pass through the insulator itself.

[0092] Exemplarily, the UHF partial discharge signal source localization model of GIS can be as Figures 5 to 7 shown.

[0093] Through the UHF partial discharge signal source localization model, rapid positioning judgment and tight coupling of the structural form of GIS are realized, providing a model basis for subsequent localization of the partial discharge signal source.

[0094] In one example, the specific implementation process of step S102, establishing a UHF partial discharge signal source localization model for GIS according to the electromagnetic attenuation model and the number of non-horizontal pot insulators in a straight line form, is as follows Figure 8 shown, mainly including steps S501 and S502:

[0095] S501: Input the built-in sensor energy gain coefficient and the non-horizontal sensor compensation factor into the electromagnetic attenuation model to obtain the sensor amplitude compensation function of GIS.

[0096] In practice, input the built-in sensor energy gain coefficient β and the non-horizontal sensor compensation factor γ into the electromagnetic attenuation model to solve the sensor amplitude compensation function compen of GIS:

[0097] .

[0098] S502: Obtain the UHF partial discharge signal source localization model of GIS according to the sensor amplitude compensation function and the number of non-horizontal pot insulators in a straight line form.

[0099] In practice, according to the typical structural form corresponding to GIS, combine the sensor amplitude compensation function compen and the number of non-horizontal pot insulators in a straight line form l to establish the UHF partial discharge signal source localization model Loca_model(z,n) of GIS:

[0100] where z represents the model type and n represents the area of each type of model.

[0101] It should be noted that during the process of establishing the UHF partial discharge signal source localization model of GIS, the upper limit n of the model structure can be set, such as n ≤ 5; of course, it is not limited to this, and it can also be determined according to the application environment and user requirements, all within the protection scope of this application.

[0102] It should also be noted that based on the above UHF partial discharge signal source localization model Loca_model(z) of GIS, combined with the sensor amplitude compensation function compen, assuming that loca_model(1,1) is compensated, then:

[0103] loca_model(1,1)=[Ampli1×compen,Ampli2].

[0104] That is to say, this application only compensates the horizontal (vertical) type of sensors alone and does not need to compensate all sensors.

[0105] S103. Obtain the similarity coefficient of the centroid of the GIS pattern according to the UHF partial discharge signal source location model and the partial discharge signal amplitudes of each measuring point in the adjacent measuring point system.

[0106] Among them, the adjacent measuring point system generally includes an internal measuring point system and an external measuring point system.

[0107] In an example, the specific implementation process of step S103. Obtain the similarity coefficient of the centroid of the GIS pattern according to the UHF partial discharge signal source location model and the partial discharge signal amplitudes of each measuring point in the adjacent measuring point system is as Figure 9 shown, mainly including steps S601 to S603:

[0108] S601. Determine the amplitude difference decision criterion of the adjacent measuring point system according to the partial discharge signal amplitudes of each measuring point in the adjacent measuring point system.

[0109] Among them, the adjacent measuring point system includes several sensors, and each sensor serves as a measuring point. According to the sensor arrangement method, the measuring points can be divided into two categories: external measuring points and internal measuring points.

[0110] In practice, according to the partial discharge signal amplitudes Aq of each measuring point in the adjacent measuring point system, set the multi-measuring point amplitude comparison analysis criterion η:

[0111] .

[0112] Determine the reference measuring point of the partial discharge signal source in the adjacent measuring point system according to the multi-measuring point amplitude comparison analysis criterion η.

[0113] It should be noted that determine the amplitude difference decision criterion of the adjacent measuring point system according to the partial discharge signal amplitudes of each measuring point in the adjacent measuring point system; among them, the amplitude difference is the difference in amplitude between two measuring points. Assume the amplitude difference Δloca_model(z,n) between two measuring points, based on the UHF partial discharge signal source location model Loca_model(z,n), the amplitude difference is as follows:

[0114] .

[0115] Obtain the amplitude difference decision criterion of the adjacent measuring point system according to the amplitude difference of the adjacent measuring point system. Specifically, auxiliary parameters x1, x2, x3, x4 and floating error θ can be set. Based on the amplitude difference Δloca_model(z,n) between two measuring points, formulate the amplitude difference decision criterion ζ(z,n) as follows:

[0116] .

[0117] S602. Input the amplitude difference judgment criterion into the UHF partial discharge signal source localization model to obtain the measured point map features of the GIS.

[0118] In practice, after inputting the amplitude difference judgment criterion into the UHF partial discharge signal source localization model, the measured point map features Pall of the GIS are obtained.

[0119] It should be noted that the measured point map features of the GIS are the map features of the two-dimensional phase-amplitude diagram.

[0120] S603. Cluster according to the measured point map features to obtain the map centroid similarity coefficient of the GIS.

[0121] In practice, according to the map features Pall, the clustering threshold α, and the environmental threshold β, the maps greater than the environmental threshold are statistically analyzed. Based on the clustering threshold α, the clustering result P and the number of features N are obtained. The clustering result is as follows:

[0122] 。

[0123] Based on the composite clustering feature P, using the number of sampling points X and Y of the map phase (x-axis) and amplitude (y-axis), the centroid Class of the clustering interval is solved:

[0124] 。

[0125] Where l is the variable within the range of X and Y. When there is one feature in the map, the centroid solution is η; when there are two features in the map, the centroid solution is η(1,2).

[0126] After obtaining the centroid of the measured point map features, the map centroid similarity coefficient τ(z,n) of the GIS can be solved using the centroid of the map features.

[0127] It should be noted that the partial discharge signal attenuates as the propagation distance increases, and the signal amplitudes received by sensors at different positions will be different. Therefore, the direction of the discharge source can be preliminarily judged by comparing the magnitudes of the signal amplitudes received by two measured points.

[0128] S104. Compare the map centroid similarity coefficient with the critical value of the map similarity coefficient to obtain the localization result of the partial discharge signal source of the GIS.

[0129] Among them, the critical value of the map similarity coefficient can be pre-determined in combination with experience, the actual application environment, and user requirements. This application does not make specific limitations, and all are within the protection scope of this application.

[0130] In practice, the map centroid similarity coefficient τ can be compared with the critical value τ0 of the map similarity coefficient. If it is less than the critical value τ0 of the map similarity coefficient and meets the discrimination criterion, rapid localization can be achieved:

[0131] 。

[0132] It should be noted that based on the attenuation of the structural form, the rough positioning of the partial discharge signal is carried out, and then the effective positioning of the partial discharge signal source is realized through the consistency judgment of the internal and external measurement points, which can effectively improve the positioning accuracy of the partial discharge signal source.

[0133] When partial discharge occurs in GIS, it is not only necessary to analyze the spectral characteristics of the partial discharge signal, but also to estimate the position of the partial discharge signal source, laying a foundation for the effective perception of the abnormal state of GIS equipment.

[0134] The current partial discharge signal positioning technology mainly focuses on the time difference positioning method and the amplitude attenuation positioning method. However, the complexity of the time difference method and the high-performance requirements for equipment have affected the application portability of this method; in addition, the measurement error of the noise partial discharge signal extracted at the starting moment is large, resulting in abnormal positioning of the partial discharge signal source; the relevant research using the amplitude attenuation method does not combine the actual structural form of GIS and ignores the influence brought by the difference in the sensor beam pointing, resulting in a large positioning error.

[0135] The partial discharge positioning method for GIS provided by the embodiments of the present application includes: establishing an electromagnetic attenuation model of GIS according to the typical structural form corresponding to GIS, and the typical structural form includes: linear structure, L-shaped structure, Z-shaped structure and T-shaped structure, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different; establishing a UHF partial discharge signal source positioning model of GIS according to the electromagnetic attenuation model and the number of different pot-type insulators in the linear form; obtaining the spectral centroid similarity coefficient of GIS according to the UHF partial discharge signal source positioning model and the partial discharge signal amplitudes of each measurement point in the adjacent measurement point system; comparing the spectral centroid similarity coefficient with the critical value of the spectral similarity coefficient to obtain the positioning result of the partial discharge signal source of GIS, which can effectively position the partial discharge signal source based on the typical structural form of GIS, not only making up for the problem of high equipment requirements for time difference method positioning, but also considering the influence brought by the difference in the sensor beam pointing, and improving the positioning accuracy.

[0136] That is, based on the actual structural form of GIS, this application solves its attenuation characteristics through an equivalent electromagnetic attenuation model; fully combines the structural form and attenuation characteristics of the sensor to establish a fast positioning model of GIS, and realizes the fast positioning of the abnormal signal source under actual working conditions through the joint comparison of internal and external sensors, providing effective support for the fast judgment and accurate positioning of on-site partial discharge signals.

[0137] In other words, based on the actual structural form of the GIS, this application conducts CST electromagnetic simulation to obtain the attenuation characteristics of the typical structural form of the GIS; constructs a positioning model for the typical structural form, compensates and corrects the form of the built-in partial discharge measurement points, and establishes a positioning model for the typical structural form; roughly locates the partial discharge signal source based on the attenuation of the structural form, and realizes the effective positioning of the partial discharge signal source through the consistency judgment of the internal and external measurement points.

[0138] It should be noted that the current parameter identification for partial discharge signals mainly focuses on the research of the system detection amplitude of partial discharge signals between different measurement points. By comparing the detection amplitudes of partial discharge signals and based on the proportional relationship, the effective positioning of partial discharge signals is realized; however, the current research only judges the difference in the system detection amplitude of partial discharge signals, does not consider the positioning error caused by the beam directivity of the sensor, and at the same time, the actual structural form of gas-insulated high-voltage electrical equipment directly affects the positioning error of the partial discharge signal source. Therefore, the current effective positioning technology based on the system detection amplitude of multi-measurement point sensors has not been practically applied. This application realizes high-precision positioning under actual working conditions through the actual structural form of the GIS, making up for the equipment requirements of the time difference method positioning and the low applicability of the traditional amplitude-based positioning.

[0139] On the basis of the above, another embodiment of this application also provides a partial discharge positioning device for GIS, please refer to Figure 10 , which mainly includes:

[0140] The first establishment unit 101 is used to establish an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different;

[0141] The second establishment unit 102 is used to establish a positioning model for the UHF partial discharge signal source of the GIS according to the electromagnetic attenuation model and the number of different basin insulators in the straight line form;

[0142] The similarity coefficient unit 103 is used to obtain the centroid similarity coefficient of the GIS map according to the positioning model of the UHF partial discharge signal source and the amplitudes of the partial discharge signals of each measurement point in the adjacent measurement point system;

[0143] The comparison unit 104 is used to compare the centroid similarity coefficient of the map with the critical value of the map similarity coefficient to obtain the positioning result of the partial discharge signal source of the GIS.

[0144] In an example, the first establishment unit 101 is specifically used for:

[0145] According to the typical structural form corresponding to the GIS, obtain the equivalent cavity structure model of the GIS;

[0146] Based on the equivalent cavity structure model, dielectric constant data, and mesh division size, obtain the equivalent transmission model of the GIS;

[0147] Based on the equivalent transmission model, discrete point signal source amplitude, discrete point signal source coordinates, and omnidirectional antenna coordinates, perform modeling to obtain the electromagnetic attenuation model of the GIS.

[0148] In one example, based on the typical structural form corresponding to the GIS, obtain the equivalent cavity structure model of the GIS, including:

[0149] Based on the inner diameter and outer diameter of the GIS, obtain the shell thickness of the GIS;

[0150] Based on the shell thickness and the geometric center coordinates of the gas insulation medium, obtain the equivalent cavity structure model of the GIS.

[0151] In one example, based on the equivalent cavity structure model, dielectric constant data, and mesh division size, obtain the equivalent transmission model of the GIS, including:

[0152] Respectively input the inner conductor dielectric constant, pot insulator dielectric constant, shell dielectric constant, gas insulation medium dielectric constant, and magnetic permeability of the GIS into the equivalent cavity structure model to obtain the inner conductor wave impedance, pot insulator wave impedance, shell wave impedance, and gas insulation medium wave impedance of the GIS;

[0153] Based on the inner conductor wave impedance, the pot insulator wave impedance, the shell wave impedance, the gas insulation medium wave impedance, and the mesh division size, obtain the equivalent transmission model of the GIS.

[0154] In one example, the second establishment unit 102 is specifically used for:

[0155] Input the built-in sensor energy gain coefficient and the non-horizontal sensor compensation factor into the electromagnetic attenuation model to obtain the sensor amplitude compensation function of the GIS;

[0156] Based on the sensor amplitude compensation function and the number of non-uniform pot insulators in the straight form, obtain the UHF partial discharge signal source location model of the GIS.

[0157] In one example, the similarity coefficient unit 103 is specifically used for:

[0158] Based on the partial discharge signal amplitudes of each measurement point in the adjacent measurement point system, determine the amplitude difference decision criterion of the adjacent measurement point system;

[0159] Input the amplitude difference decision criterion into the UHF partial discharge signal source localization model of the GIS to obtain the measured point map features of the GIS;

[0160] Perform clustering based on the measured point map features to obtain the map centroid similarity coefficient of the GIS.

[0161] The partial discharge localization device of the GIS provided in this embodiment includes: a first establishment unit 101 for establishing an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different; a second establishment unit 102 for establishing a UHF partial discharge signal source localization model of the GIS according to the electromagnetic attenuation model and the number of non-through basin insulators in the straight line form; a similarity coefficient unit 103 for obtaining the map centroid similarity coefficient of the GIS according to the UHF partial discharge signal source localization model and the partial discharge signal amplitudes of each measured point in the adjacent measured point system; a comparison unit 104 for comparing the map centroid similarity coefficient with the map similarity coefficient critical value to obtain the partial discharge signal source localization result of the GIS, which can effectively localize the partial discharge signal source based on the typical structural form of the GIS and make up for the problem of high equipment requirements for time difference method localization.

[0162] It should be noted that for the relevant descriptions of each unit in the partial discharge localization device of the GIS, reference can be made to the corresponding method embodiments above, and details will not be repeated here.

[0163] Optionally, another embodiment of the present application further provides a computer storage medium for storing a computer program, which, when executed, is specifically used to implement the partial discharge localization method of the GIS provided in any embodiment of the present application.

[0164] It should be noted that for the relevant descriptions of the partial discharge localization method of the GIS, reference can be made to the above embodiments, and details will not be repeated here.

[0165] Optionally, another embodiment of the present application further provides an electronic device, as Figure 11 shown, the electronic device includes a memory 601 and a processor 602.

[0166] Among them, the memory 601 is used to store a computer program;

[0167] The processor 602 is used to execute the computer program, which is specifically used to implement the partial discharge localization method of the GIS provided in any embodiment of the present application.

[0168] It should be noted that for the relevant descriptions of the partial discharge localization method of the GIS, reference can also be made to the above embodiments, and details will not be repeated here.

[0169] The features described in the various embodiments in this specification can be replaced or combined with each other. For the same or similar parts among the various embodiments, reference can be made to each other, and each embodiment focuses on the differences from other embodiments. In particular, for a system or a system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and reference can be made to the relevant parts of the method embodiment for the relevant content. The systems and system embodiments described above are merely illustrative. 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 to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative efforts. Professionals can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this article can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professionals can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0170] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0171] It should also be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

Claims

1. A method for local discharge location of GIS, characterized in that, Including: Establish an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, where the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different; Establish a UHF partial discharge signal source localization model of the GIS according to the electromagnetic attenuation model and the number of non-uniform pot-type insulators in the straight line form; Obtain the centroid similarity coefficient of the GIS spectrogram according to the UHF partial discharge signal source localization model and the local discharge signal amplitudes of each measuring point in the adjacent measuring point system; Compare the centroid similarity coefficient of the spectrogram with the critical value of the spectrogram similarity coefficient to obtain the localization result of the partial discharge signal source of the GIS.

2. The partial discharge location method of GIS according to claim 1, characterized in that Establish an electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, including: Obtain an equivalent cavity structure model of the GIS according to the typical structural form corresponding to the GIS; Obtain an equivalent transmission model of the GIS according to the equivalent cavity structure model, the dielectric constant data of the GIS, and the mesh division size; Perform modeling according to the equivalent transmission model, the discrete point signal source amplitude, the discrete point signal source coordinates, and the omnidirectional antenna coordinates to obtain the electromagnetic attenuation model of the GIS.

3. The partial discharge location method of the GIS according to claim 2, characterized in that, Obtain an equivalent cavity structure model of the GIS according to the typical structural form corresponding to the GIS, including: Obtain the shell thickness of the GIS according to the inner diameter and outer diameter of the GIS; Obtain the equivalent cavity structure model of the GIS according to the shell thickness and the geometric center coordinates of the gas insulation medium.

4. The partial discharge location method of the GIS according to claim 2, characterized in that, Obtain an equivalent transmission model of the GIS according to the equivalent cavity structure model, the dielectric constant data, and the mesh division size, including: Respectively input the inner conductor dielectric constant, pot-type insulator dielectric constant, shell dielectric constant, and gas insulation medium dielectric constant and permeability of the GIS into the equivalent cavity structure model to obtain the inner conductor wave impedance, pot-type insulator wave impedance, shell wave impedance, and gas insulation medium wave impedance of the GIS; Obtain the equivalent transmission model of the GIS according to the inner conductor wave impedance, the pot-type insulator wave impedance, the shell wave impedance, the gas insulation medium wave impedance, and the mesh division size.

5. The partial discharge location method of the GIS according to claim 1, characterized in that, Establish a UHF partial discharge signal source localization model of the GIS according to the electromagnetic attenuation model and the number of non-uniform pot-type insulators in the straight line form, including: Input the built-in sensor energy gain coefficient and the non-horizontal sensor compensation factor into the electromagnetic attenuation model to obtain the sensor amplitude compensation function of the GIS; Obtain the UHF partial discharge signal source localization model of the GIS according to the sensor amplitude compensation function and the number of non-uniform pot-type insulators in the straight line form.

6. The partial discharge location method of the GIS according to claim 1, characterized in that, Obtain the centroid similarity coefficient of the GIS spectrogram according to the UHF partial discharge signal source localization model and the local discharge signal amplitudes of each measuring point in the adjacent measuring point system, including: Determine the amplitude difference decision criterion of the adjacent measuring point system according to the local discharge signal amplitudes of each measuring point in the adjacent measuring point system; Input the amplitude difference decision criterion into the UHF partial discharge signal source localization model to obtain the measured point map features of the GIS; Cluster according to the measured point map features to obtain the map centroid similarity coefficient of the GIS.

7. A partial discharge location device for GIS, characterized in that, Including: The first establishment unit is used to establish the electromagnetic attenuation model of the GIS according to the typical structural form corresponding to the GIS, and the electromagnetic attenuation amounts of the electromagnetic attenuation models corresponding to different typical structural forms are different; The second establishment unit is used to establish the UHF partial discharge signal source localization model of the GIS according to the electromagnetic attenuation model and the number of disconnector insulators with different straight-line forms; The similarity coefficient unit is used to obtain the map centroid similarity coefficient of the GIS according to the UHF partial discharge signal source localization model and the partial discharge signal amplitudes of each measured point in the adjacent measured point system; The comparison unit is used to compare the map centroid similarity coefficient with the map similarity coefficient critical value to obtain the localization result of the partial discharge signal source of the GIS.

8. The partial discharge positioning device of GIS according to claim 7, characterized in that, The first establishment unit is specifically used for: Obtain the equivalent cavity structure model of the GIS according to the typical structural form corresponding to the GIS; Obtain the equivalent transmission model of the GIS according to the equivalent cavity structure model, dielectric constant data and grid division size; Perform modeling according to the equivalent transmission model, discrete point signal source amplitude, discrete point signal source coordinates and omnidirectional antenna coordinates to obtain the electromagnetic attenuation model of the GIS.

9. An electronic device, characterized in that, Including: A memory and a processor; Wherein, the memory is used to store computer programs; The processor is used to execute the computer program, and is specifically used to implement the partial discharge localization method of the GIS according to any one of claims 1-6.

10. A computer storage medium, characterized in that, For storing a computer program, when the computer program is executed, it is specifically used to implement the partial discharge localization method of the GIS according to any one of claims 1-6.

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