Partial discharge positioning method and device of GIS, electronic equipment and storage medium

Abstract

The application provides a GIS partial discharge positioning method and device, electronic equipment and a storage medium. The method comprises the following steps: establishing an electromagnetic attenuation model of GIS according to a typical structure form corresponding to the GIS. The electromagnetic attenuation amount of the electromagnetic attenuation model corresponding to different typical structure forms is different. A UHF partial discharge signal source positioning model of GIS is established according to the electromagnetic attenuation model and the number of straight form non-through pot insulators. A GIS atlas centroid similarity coefficient is obtained according to the UHF partial discharge signal source positioning model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system. The GIS partial discharge signal source positioning result is obtained by comparing the atlas centroid similarity coefficient with the atlas similarity coefficient critical value. The GIS partial discharge signal source can be effectively positioned based on the typical structure form of the GIS, the positioning accuracy is improved, and the problem that the equipment requirement of the time difference method positioning is high is solved.

Description

Technical Field

[0001] This invention relates to the field of electronic circuit technology, specifically to a partial discharge location method, device, electronic device, and storage medium for GIS. Background Technology

[0002] Gas-insulated switchgear (GIS) is a type of high-voltage electrical equipment used in power systems. It utilizes gas as an insulating medium to isolate and protect various power transmission distribution components. It features a compact structure, high safety and reliability, long maintenance cycles, and insensitivity to external environmental influences. The stable operation of GIS is closely linked to the reliable power transmission of the local power grid. Under actual operating conditions, partial discharge phenomena can occur within GIS due to foreign object interference, equipment manufacturing processes, and long-term aging, affecting stable operation. When partial discharge occurs within GIS insulated with SF6 gas, the resulting partial discharge signal is characterized by a steep rise, a wide spectral distribution (300MHz~1500MHz), and a short pulse duration.

[0003] Currently, discharge analysis of partial discharges in GIS mainly focuses on parameter identification of partial discharge signals and localization of the partial discharge signal source. Current techniques for locating partial discharge signal sources primarily utilize the time delay difference of signals from different measurement points for processing and analysis. This involves acquiring the wavefront position of the partial discharge signal source and achieving precise location based on the time delay difference of the wavefront position. However, this method requires signal acquisition devices with frequencies as high as 10 GHz. 9 The frequency is above Hz, and the extraction results of different signal wavefronts have a large degree of randomness (algorithm system error, environmental error "signal-to-noise ratio, electromagnetic interference"), which affects the positioning accuracy. In addition, high-speed signal acquisition devices and their use have high technical / economic barriers. Summary of the Invention

[0004] To address this issue, this application provides a partial discharge location method, apparatus, electronic device, and storage medium for GIS, thereby solving the problem that existing methods require signal acquisition devices with frequencies as high as 10 GHz. 9 The frequency range is above Hz, and the extraction results of different signal wavefronts have a large degree of randomness, which affects the positioning accuracy. High-speed signal acquisition devices also have high technical and economic barriers to entry.

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

[0006] The first aspect of this application discloses a partial discharge localization method for GIS, comprising:

[0007] Based on the typical structural forms of the GIS, an electromagnetic attenuation model of the GIS is established. The electromagnetic attenuation amount of the electromagnetic attenuation model is different for different typical structural forms.

[0008] Based on the electromagnetic attenuation model and the number of straight-shaped non-circular basin insulators, a UHF partial discharge signal source localization model for the GIS is established.

[0009] Based on the UHF partial discharge signal source localization model and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system, the centroid similarity coefficient of the GIS is obtained.

[0010] By comparing the centroid similarity coefficient of the spectrum with the critical value of the spectrum similarity coefficient, the localization result of the partial discharge signal source of the GIS is obtained.

[0011] Optionally, in the above-described method for locating partial discharge in a GIS, an electromagnetic attenuation model of the GIS is established based on its typical structural morphology, including:

[0012] Based on the typical structural morphology corresponding to the GIS, the equivalent cavity structure model of the GIS is obtained;

[0013] Based on the equivalent cavity structure model, the dielectric constant data of the GIS, and the mesh subdivision size, the equivalent transmission model of the GIS is obtained;

[0014] The electromagnetic attenuation model of the GIS is obtained by modeling based on 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.

[0015] Optionally, in the above-described method for locating partial discharges in a GIS, an equivalent cavity structure model of the GIS is obtained based on its typical structural morphology, including:

[0016] The shell thickness of the GIS is obtained based on its inner and outer diameters.

[0017] Based on the shell thickness and the geometric center coordinates of the gas insulating medium, the equivalent cavity structure model of the GIS is obtained.

[0018] Optionally, in the above-described method for locating partial discharge in GIS, the equivalent transmission model of the GIS is obtained based on the equivalent cavity structure model, dielectric constant data, and mesh partitioning size, including:

[0019] The dielectric constants of the inner conductor, the dielectric constant of the basin insulator, the dielectric constant of the shell, the dielectric constant of the gas insulating medium, and the permeability of the GIS are respectively input into the equivalent cavity structure model to obtain the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, and the wave impedance of the gas insulating medium of the GIS.

[0020] The equivalent transmission model of the GIS is obtained based on the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, the wave impedance of the gas insulating medium, and the grid partitioning size.

[0021] Optionally, in the above-mentioned partial discharge location method for GIS, based on the electromagnetic attenuation model and the number of straight-line shaped basin insulators, a UHF partial discharge signal source location model for the GIS is established, 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] Based on the sensor amplitude compensation function and the number of straight-line insulators with different pot shapes, the UHF partial discharge signal source localization model of the GIS is obtained.

[0024] Optionally, in the above-described GIS partial discharge location method, the centroid similarity coefficient of the GIS is obtained based on the UHF partial discharge signal source location model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system, including:

[0025] The amplitude difference decision criterion of the adjacent measuring point system is determined based on the partial discharge signal amplitude of each measuring point in the adjacent measuring point system.

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

[0027] Clustering is performed based on the characteristics of the measurement point map to obtain the centroid similarity coefficient of the GIS map.

[0028] The second aspect of this application discloses a partial discharge location device for GIS, comprising:

[0029] The first establishment unit is used to establish an electromagnetic attenuation model of the GIS based on the typical structural form corresponding to the GIS. The electromagnetic attenuation amount of the electromagnetic attenuation model is different for different typical structural forms.

[0030] The second establishment unit is used to establish the UHF partial discharge signal source location model of the GIS based on the electromagnetic attenuation model and the number of straight-shaped non-circular insulators.

[0031] The similarity coefficient unit is used to obtain the centroid similarity coefficient of the GIS based on the localization model of the UHF partial discharge signal source and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system.

[0032] The comparison unit is used to compare the centroid similarity coefficient of the spectrum with the critical value of the spectrum similarity coefficient to obtain the localization result of the partial discharge signal source of the GIS.

[0033] Optionally, in the aforementioned partial discharge location device for GIS, the first establishing unit is specifically used for:

[0034] Based on the typical structural morphology corresponding to the GIS, the equivalent cavity structure model of the GIS is obtained;

[0035] Based on the equivalent cavity structure model, dielectric constant data, and mesh partitioning size, the equivalent transmission model of the GIS is obtained;

[0036] The electromagnetic attenuation model of the GIS is obtained by modeling based on 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.

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

[0038] The memory is used to store computer programs;

[0039] The processor is used to execute the computer program, specifically to implement the partial discharge location method for GIS as disclosed in any of the first aspects.

[0040] The fourth aspect of this application discloses a computer storage medium for storing a computer program, which, when executed, is specifically used to implement the partial discharge location method for GIS as described in any of the claims of the first aspect.

[0041] This invention provides a partial discharge localization method for GIS, comprising: establishing an electromagnetic attenuation model for GIS based on its typical structural morphology, wherein the electromagnetic attenuation amount varies for different typical structural morphologies; establishing a UHF partial discharge signal source localization model for GIS based on the electromagnetic attenuation model and the number of basin-type insulators with different linear morphologies; obtaining the GIS spectral centroid similarity coefficient based on the UHF partial discharge signal source localization model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system; and comparing the spectral centroid similarity coefficient with the critical value of the spectral similarity coefficient to obtain the partial discharge signal source localization result for GIS. This method can effectively locate the partial discharge signal source based on the typical structural morphology of GIS, improving the localization accuracy and compensating for the high equipment requirements of time-of-flight localization. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0043] Figure 1 A schematic diagram illustrating partial discharge location in GIS provided in this application;

[0044] Figure 2 A flowchart of partial discharge localization in GIS is provided as an embodiment of this application;

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

[0046] Figure 4 A flowchart illustrating the establishment of an electromagnetic attenuation model for GIS, provided in an embodiment of this application;

[0047] Figures 5 to 7 A schematic diagram of the ultra-high frequency partial discharge signal source localization model provided in the embodiments of this application;

[0048] Figure 8 A flowchart illustrating the establishment of a localization model for a UHF partial discharge signal source, provided in an embodiment of this application;

[0049] Figure 9 A flowchart for determining the centroid similarity coefficient of a GIS map, provided as an embodiment of this application;

[0050] Figure 10 This is a schematic diagram of the partial discharge locating device for GIS provided in the embodiments of this application;

[0051] Figure 11 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] First, it should be noted that GIS typically includes components such as circuit breakers, disconnectors, grounding switches, current transformers, voltage transformers, surge arresters, and connecting busbars. Taking SF6 as the insulating gas as an example, the above components are encapsulated in a metal casing filled with SF6 gas. This design makes GIS have a smaller footprint, higher reliability, fewer maintenance requirements, and better environmental adaptability compared to traditional air-insulated switchgear.

[0054] Based on the above, this application provides a partial discharge location method for GIS to solve the problems of existing methods requiring signal acquisition devices with frequencies as high as 109 Hz or higher, and the extraction results of different signal wavefronts having a large degree of randomness, affecting positioning accuracy, and the high technical / economic threshold of high-speed signal acquisition devices.

[0055] Combination Figure 1 and Figure 2 , Figure 1 The antenna in the GIS acts as a sensor, and the wave source acts as a partial discharge signal source. The partial discharge localization method of this GIS mainly includes the following steps:

[0056] S101. Based on the typical structural forms of GIS, establish an electromagnetic attenuation model for GIS.

[0057] Typical structural forms include at least: straight structure, L-shaped structure, Z-shaped structure, T-shaped structure, and portal structure. The electromagnetic attenuation amount of the electromagnetic attenuation model varies depending on the typical structural form. For example, the electromagnetic attenuation amount of the electromagnetic attenuation model corresponding to different typical structural forms can be as follows: Figure 3 As shown.

[0058] In practice, based on the actual structural form of GIS, the typical structural form of GIS can be determined, and an electromagnetic attenuation model of GIS can be built, providing support for subsequent electromagnetic attenuation solutions and the establishment of a UHF partial discharge signal source localization model.

[0059] In one embodiment, the specific execution process of step S101, establishing the electromagnetic attenuation model of the GIS based on its typical structural form, is as follows: Figure 4 As shown, it mainly includes steps S201 to S203:

[0060] S201. Based on the typical structural morphology of GIS, obtain the equivalent cavity structure model of GIS.

[0061] In practice, the inner and outer diameters of a GIS can be obtained based on its typical structural form; the shell thickness of a GIS can be obtained based on its inner and outer diameters; finally, the equivalent cavity structure model of a GIS can be obtained based on the shell thickness and the geometric center coordinates of the gas insulating medium.

[0062] For example, assuming 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 using the following formula:

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

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

[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. Based on the equivalent cavity structure model, the dielectric constant data of GIS, and the mesh subdivision size, the equivalent transmission model of GIS is obtained.

[0069] The dielectric constant data of GIS generally include the dielectric constant ε1 of the inner conductor, the dielectric constant ε2 of the basin insulator, the dielectric constant ε3 of the shell, and the dielectric constant ε4 of the gas insulating medium, etc.; of course, it is not limited to these, and can also be determined according to the application environment and user needs, all of which are within the protection scope of this application.

[0070] In GIS simulation, the setting of the GIS mesh size x directly affects the calculation accuracy and convergence. Specifically, for regions with concentrated electric fields in GIS (such as conductor edges and insulator surfaces), local mesh refinement can be used; for the interface between SF6 gas and solid insulating medium, a high-resolution mesh is required.

[0071] In practice, based on the equivalent cavity structure model, the equivalent transport model mod of the GIS can be constructed by inputting the dielectric constant data and mesh size of the GIS.

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

[0073] In one embodiment, the specific execution process of step S202, obtaining the equivalent transmission model of GIS based on the equivalent cavity structure model, the dielectric constant data of GIS, and the mesh subdivision size, is as follows, mainly including steps S301 and S302:

[0074] S301. Input the dielectric constant of the inner conductor of the GIS, the dielectric constant of the basin insulator, the dielectric constant of the shell, the dielectric constant of the gas insulating medium, and the permeability into the equivalent cavity structure model to obtain the wave impedance of the inner conductor of the GIS, the wave impedance of the basin insulator, the wave impedance of the shell, and the wave impedance of the gas insulating medium.

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

[0076] ;

[0077] ;

[0078] ;

[0079] ;

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

[0081] S302. Based on the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, the wave impedance of the gas insulating medium, and the grid partitioning size, the equivalent transmission model of GIS is obtained.

[0082] In practice, the equivalent transmission model mod of GIS can be obtained based on the grid partitioning size x and the wave impedances of the inner conductor, the basin insulator, the shell, and the gas insulating medium:

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

[0084] S203. Based on 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, a model is created to obtain the electromagnetic attenuation model of GIS.

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

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

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

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

[0089] .

[0090] S102. Based on the electromagnetic attenuation model and the number of straight-line shaped basin insulators, establish a UHF partial discharge signal source localization model for GIS.

[0091] In this context, "straight-line configuration" typically refers to the busbars or conductor sections within equipment arranged in a straight line for power transmission and distribution. "Non-through-hole basin insulators" refers to basin insulators that are not directly connected or do not have traditional through holes; their main function is to provide mechanical support and ensure electrical insulation performance. Different basin insulators are primarily used in specific locations, such as when conductors need to be fixed and insulation provided, but current does not need to pass through the insulator itself.

[0092] For example, the UHF partial discharge signal source localization model of GIS can be as follows: Figures 5 to 7 As shown.

[0093] By using a UHF partial discharge signal source localization model, we can achieve rapid localization decision-making and tight coupling with the structural form of GIS, providing a model basis for subsequent localization of partial discharge signal sources.

[0094] In one example, the specific execution process of step S102, establishing the UHF partial discharge signal source localization model for GIS based on the electromagnetic attenuation model and the number of straight-line shaped basin insulators, is as follows: Figure 8 As shown, it mainly includes 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, the built-in sensor energy gain coefficient β and the non-horizontal sensor compensation factor γ are input into the electromagnetic attenuation model to solve for the sensor amplitude compensation function compen of the GIS:

[0097] .

[0098] S502. Based on the sensor amplitude compensation function and the number of basin-type insulators with different linear morphology, the UHF partial discharge signal source localization model of GIS is obtained.

[0099] In practice, based on the typical structural morphology of GIS, combined with the sensor amplitude compensation function compen and the number l of basin-type insulators with different linear morphologies, a localization model for the UHF partial discharge signal source of GIS, Loca_model(z,n), is established:

[0100] Where z represents the model type and n represents the region of each model type.

[0101] It should be noted that in the process of establishing the UHF partial discharge signal source localization model for 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 can also be determined according to the application environment and user needs, all of which are within the protection scope of this application.

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

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

[0104] In other words, this application only compensates for horizontal (vertical) type sensors, and does not need to compensate for all sensors.

[0105] S103. Based on the UHF partial discharge signal source location model and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system, the centroid similarity coefficient of the GIS map is obtained.

[0106] The adjacent measuring point system generally includes a built-in measuring point system and an external measuring point system.

[0107] In one example, the specific execution process of step S103, obtaining the centroid similarity coefficient of the GIS map based on the UHF partial discharge signal source localization model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system, is as follows: Figure 9 As shown, the main steps include S601 to S603:

[0108] S601. Determine the amplitude difference judgment criterion of the adjacent measuring point system based on the partial discharge signal amplitude of each measuring point in the adjacent measuring point system.

[0109] The adjacent measuring point system includes several sensors, each serving as a measuring point. Based on the sensor arrangement, measuring points can be divided into two main categories: external measuring points and internal measuring points.

[0110] In practice, based on the partial discharge signal amplitude Aq of each measuring point in the adjacent measuring point system, a multi-measuring point amplitude comparison analysis criterion η is set:

[0111] .

[0112] Based on the multi-point amplitude comparison analysis criterion η, the reference measurement point for the partial discharge signal source in the adjacent measurement point system is determined.

[0113] It should be noted that the amplitude difference judgment criterion of the adjacent measuring point system is determined based on the partial discharge signal amplitude of each measuring point in the adjacent measuring point system; whereby the amplitude difference is the difference in amplitude between two measuring points. Assuming the amplitude difference between the two points is Δloca_model(z,n), based on the UHF partial discharge signal source localization model Loca_model(z,n), the amplitude difference is as follows:

[0114] .

[0115] Based on the amplitude difference between adjacent measuring point systems, the amplitude difference decision criterion for adjacent measuring point systems is obtained. Specifically, auxiliary parameters x1, x2, x3, and x4, and a floating error θ can be set. Based on the amplitude difference Δloca_model(z,n) between the two points, the amplitude difference decision criterion ζ(z,n) is formulated as follows:

[0116] .

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

[0118] In practice, after inputting the amplitude difference decision criterion into the UHF partial discharge signal source localization model, the measurement point map feature Pall of the GIS is obtained.

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

[0120] S603. Cluster the data based on the characteristics of the measurement point map to obtain the centroid similarity coefficient of the GIS map.

[0121] In practice, based on the map feature Pall, clustering threshold α, and environmental threshold β, statistics are performed on maps with values ​​greater than the environmental threshold. Based on the clustering threshold α, the clustering result P and the number of features N are obtained. The clustering results are as follows:

[0122] .

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

[0124] .

[0125] Where l is a variable belonging to the range of X and Y, when the spectrum has one feature, the centroid is solved as η; when the spectrum has two features, the centroid is solved as η(1,2).

[0126] After obtaining the centroid of the measurement point map features, the similarity coefficient τ(z,n) of the GIS map centroid can be obtained from 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 amplitude received by the sensor at different locations will be different. Therefore, the direction of the discharge source can be preliminarily determined by comparing the signal amplitude received by two measuring points.

[0128] S104. By comparing the centroid similarity coefficient and the critical value of the spectrum similarity coefficient, the localization result of the partial discharge signal source in GIS is obtained.

[0129] The critical value of the spectrum similarity coefficient can be pre-selected based on experience, actual application environment and user needs. This application does not impose specific limitations on it, and all of them are within the protection scope of this application.

[0130] In practice, the centroid similarity coefficient τ of the spectral map can be compared with the critical value τ0 of the spectral similarity coefficient. If it is less than the critical value τ0 and meets the discrimination criterion, then the location can be quickly determined.

[0131] .

[0132] It should be noted that coarse localization of partial discharge signals based on structural morphology attenuation, followed by effective localization of the partial discharge signal source through consistency judgment of internal and external measurement points, can effectively improve the localization accuracy of the partial discharge signal source.

[0133] When a GIS generates partial discharge, it is necessary not only to analyze the spectral characteristics of the partial discharge signal, but also to estimate the location of the partial discharge signal source, so as to lay the foundation for the effective perception of abnormal status of GIS equipment.

[0134] Current partial discharge signal localization techniques mainly focus on time difference localization and amplitude attenuation localization. However, the complexity of the time difference method and the high performance requirements of the equipment affect the portability of the application. In addition, the large measurement error of the noise partial discharge signal extracted at the initial moment leads to abnormal localization of the partial discharge signal source. Related studies using the amplitude attenuation method have not taken into account the actual structural morphology of GIS and have ignored the influence of sensor beam pointing differences, resulting in large localization errors.

[0135] The partial discharge localization method for GIS provided in this application includes: establishing an electromagnetic attenuation model for GIS based on its typical structural morphology, including straight-line, L-shaped, Z-shaped, and T-shaped structures, with different electromagnetic attenuation values ​​corresponding to different typical structural morphologies; establishing a UHF partial discharge signal source localization model for GIS based on the electromagnetic attenuation model and the number of basin-type insulators in the straight-line morphology; obtaining the GIS spectrum centroid similarity coefficient based on the UHF partial discharge signal source localization model and the partial discharge signal amplitude of each measuring point in the adjacent measuring point system; and comparing the spectrum centroid similarity coefficient with the critical value of the spectrum similarity coefficient to obtain the localization result of the GIS partial discharge signal source. This method can effectively locate the partial discharge signal source based on the typical structural morphology of GIS, not only compensating for the high equipment requirements of time-of-flight localization but also considering the impact of sensor beam pointing differences, thus improving localization accuracy.

[0136] In other words, this application, based on the actual structural form of GIS, solves its attenuation characteristics through an equivalent electromagnetic attenuation model; by fully combining the structural form and attenuation characteristics of the sensor, a rapid positioning model for GIS is established, and the rapid positioning of abnormal signal sources under actual working conditions is achieved through joint comparison of internal and external sensors, providing effective support for the rapid determination and accurate positioning of partial discharge signals on site.

[0137] In other words, this application uses CST electromagnetic simulation to solve the problem based on the actual structural form of GIS, and obtains the attenuation characteristics of typical structural forms of GIS; it builds a positioning model of typical structural forms, compensates and corrects the form of the internal measurement points of partial discharge, and establishes a positioning model of typical structural forms; it performs coarse positioning of the partial discharge signal source based on the attenuation of the structural form, and achieves effective positioning of the partial discharge signal source through consistency judgment of internal and external measurement points.

[0138] It is worth noting that current parameter identification for partial discharge signals mainly focuses on the study of the system detection amplitude of partial discharge signals between different measuring points. By comparing the magnitude of the detected amplitude of partial discharge signals, effective localization of the partial discharge signals is achieved based on the proportional relationship. However, current research only evaluates the differences in the system detection amplitude of partial discharge signals and does not consider the localization error caused by the sensor beam pointing. At the same time, the actual structural form of gas-insulated high-voltage electrical equipment directly affects the localization error of the partial discharge signal source. Therefore, current effective localization technology based on the system detection amplitude of multi-measuring-point sensors has not yet been practically applied. This application, however, achieves high-precision localization under actual working conditions by utilizing the actual structural form of GIS, thus overcoming the equipment requirements of time-of-flight localization and the low applicability of traditional amplitude-based localization.

[0139] Based on the above, another embodiment of this application also provides a partial discharge location device for GIS. Please refer to [link to relevant documentation]. Figure 10 The device mainly includes:

[0140] The first establishment unit 101 is used to establish an electromagnetic attenuation model of GIS based on the typical structural forms corresponding to GIS. The electromagnetic attenuation amount of the electromagnetic attenuation model corresponding to different typical structural forms is different.

[0141] The second establishment unit 102 is used to establish a UHF partial discharge signal source location model for GIS based on the electromagnetic attenuation model and the number of straight-shaped basin insulators.

[0142] Similarity coefficient unit 103 is used to obtain the centroid similarity coefficient of the GIS map based on the localization model of the UHF partial discharge signal source and the amplitude of the partial discharge signal of each measuring point in the adjacent measuring point system;

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

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

[0145] Based on the typical structural morphology corresponding to the GIS, the equivalent cavity structure model of the GIS is obtained;

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

[0147] The electromagnetic attenuation model of the GIS is obtained by modeling based on 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.

[0148] In one example, based on the typical structural morphology corresponding to the GIS, an equivalent cavity structure model of the GIS is obtained, including:

[0149] The shell thickness of the GIS is obtained based on its inner and outer diameters.

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

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

[0152] The dielectric constants of the inner conductor, the dielectric constant of the basin insulator, the dielectric constant of the shell, the dielectric constant of the gas insulating medium, and the permeability of the GIS are respectively input into the equivalent cavity structure model to obtain the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, and the wave impedance of the gas insulating medium of the GIS.

[0153] The equivalent transmission model of the GIS is obtained based on the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, the wave impedance of the gas insulating medium, and the grid partitioning size.

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

[0155] 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.

[0156] Based on the sensor amplitude compensation function and the number of straight-line insulators with different pot shapes, the UHF partial discharge signal source localization model of the GIS is obtained.

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

[0158] The amplitude difference decision criterion of the adjacent measuring point system is determined based on the partial discharge signal amplitude of each measuring point in the adjacent measuring point system.

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

[0160] Clustering is performed based on the characteristics of the measurement point map to obtain the centroid similarity coefficient of the GIS map.

[0161] The partial discharge location device for GIS provided in this embodiment includes: a first establishment unit 101 for establishing an electromagnetic attenuation model for GIS based on the typical structural morphology corresponding to GIS, wherein the electromagnetic attenuation amount of the electromagnetic attenuation model corresponding to different typical structural morphologies is different; a second establishment unit 102 for establishing a UHF partial discharge signal source location model for GIS based on the electromagnetic attenuation model and the number of basin-type insulators of different linear morphologies; a similarity coefficient unit 103 for obtaining the centroid similarity coefficient of the GIS based on the UHF partial discharge signal source location model and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system; and a comparison unit 104 for comparing the centroid similarity coefficient of the GIS with the critical value of the GIS similarity coefficient to obtain the location result of the partial discharge signal source of GIS. This device can effectively locate the partial discharge signal source based on the typical structural morphology of GIS, making up for the problem of high equipment requirements in time difference method location.

[0162] It should be noted that for relevant descriptions of each unit in the partial discharge location device of GIS, please refer to the corresponding method embodiments mentioned above, and will not be repeated here.

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

[0164] It should be noted that the relevant explanations regarding the partial discharge location method of GIS can be found in the above embodiments, and will not be repeated here.

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

[0166] Among them, memory 601 is used to store computer programs;

[0167] The processor 602 is used to execute computer programs, specifically to implement the partial discharge location method for GIS provided in any embodiment of this application.

[0168] It should be noted that the relevant explanations regarding the partial discharge location method of GIS can also be found in the above embodiments, and will not be repeated here.

[0169] The features described in the various embodiments of this specification can be substituted for or combined with each other. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for system or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the description of the method embodiments. The systems and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort. Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

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

[0171] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A partial discharge localization method for GIS, characterized in that, include: Based on the typical structural forms of the GIS, an electromagnetic attenuation model of the GIS is established. The electromagnetic attenuation amount of the electromagnetic attenuation model is different for different typical structural forms. Based on the electromagnetic attenuation model and the number of straight-shaped non-circular basin insulators, a UHF partial discharge signal source localization model for the GIS is established. Based on the UHF partial discharge signal source localization model and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system, the centroid similarity coefficient of the GIS is obtained. By comparing the centroid similarity coefficient of the spectrum with the critical value of the spectrum similarity coefficient, the localization result of the partial discharge signal source of the GIS is obtained.

2. The partial discharge localization method for GIS according to claim 1, characterized in that, Based on the typical structural morphology corresponding to the GIS, an electromagnetic attenuation model for the GIS is established, including: Based on the typical structural morphology corresponding to the GIS, the equivalent cavity structure model of the GIS is obtained; Based on the equivalent cavity structure model, the dielectric constant data of the GIS, and the mesh subdivision size, the equivalent transmission model of the GIS is obtained; The electromagnetic attenuation model of the GIS is obtained by modeling based on 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.

3. The partial discharge localization method for GIS according to claim 2, characterized in that, Based on the typical structural morphology corresponding to the GIS, an equivalent cavity structure model of the GIS is obtained, including: The shell thickness of the GIS is obtained based on its inner and outer diameters. Based on the shell thickness and the geometric center coordinates of the gas insulating medium, the equivalent cavity structure model of the GIS is obtained.

4. The partial discharge localization method for GIS according to claim 2, characterized in that, Based on the equivalent cavity structure model, dielectric constant data, and mesh partitioning size, the equivalent transmission model of the GIS is obtained, including: The dielectric constants of the inner conductor, the dielectric constant of the basin insulator, the dielectric constant of the shell, the dielectric constant of the gas insulating medium, and the permeability of the GIS are respectively input into the equivalent cavity structure model to obtain the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, and the wave impedance of the gas insulating medium of the GIS. The equivalent transmission model of the GIS is obtained based on the wave impedance of the inner conductor, the wave impedance of the basin insulator, the wave impedance of the shell, the wave impedance of the gas insulating medium, and the grid partitioning size.

5. The partial discharge localization method for GIS according to claim 1, characterized in that, Based on the electromagnetic attenuation model and the number of linear non-circular basin insulators, a UHF partial discharge signal source localization model for the GIS is established, including: 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. Based on the sensor amplitude compensation function and the number of straight-line insulators with different pot shapes, the UHF partial discharge signal source localization model of the GIS is obtained.

6. The partial discharge localization method for GIS according to claim 1, characterized in that, Based on the UHF partial discharge signal source localization model and the partial discharge signal amplitudes of each measuring point in the adjacent measuring point system, the centroid similarity coefficient of the GIS is obtained, including: The amplitude difference decision criterion of the adjacent measuring point system is determined based on the partial discharge signal amplitude of each measuring point in the adjacent measuring point system. The amplitude difference decision criterion is input into the UHF partial discharge signal source localization model to obtain the measurement point map features of the GIS; Clustering is performed based on the characteristics of the measurement point map to obtain the centroid similarity coefficient of the GIS map.

7. A partial discharge locating device for GIS, characterized in that, include: The first establishment unit is used to establish an electromagnetic attenuation model of the GIS based on the typical structural form corresponding to the GIS. The electromagnetic attenuation amount of the electromagnetic attenuation model is different for different typical structural forms. The second establishment unit is used to establish the UHF partial discharge signal source location model of the GIS based on the electromagnetic attenuation model and the number of straight-shaped non-circular insulators. The similarity coefficient unit is used to obtain the centroid similarity coefficient of the GIS based on the localization model of the UHF partial discharge signal source and the amplitude of the partial discharge signal at each measuring point in the adjacent measuring point system. The comparison unit is used to compare the centroid similarity coefficient of the spectrum with the critical value of the spectrum similarity coefficient to obtain the localization result of the partial discharge signal source of the GIS.

8. The partial discharge locating device for GIS according to claim 7, characterized in that, The first establishment unit is specifically used for: Based on the typical structural morphology corresponding to the GIS, the equivalent cavity structure model of the GIS is obtained; Based on the equivalent cavity structure model, dielectric constant data, and mesh partitioning size, the equivalent transmission model of the GIS is obtained; The electromagnetic attenuation model of the GIS is obtained by modeling based on 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.

9. An electronic device, characterized in that, include: Memory and processor; The memory is used to store computer programs; The processor is used to execute the computer program, specifically to implement the partial discharge location method for GIS as described in any one of claims 1-6.

10. A computer storage medium, characterized in that, Used to store computer programs, which, when executed, are specifically used to implement the partial discharge location method for GIS as described in any one of claims 1-6.

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