Capacitance parameter determination method and device of iron core sensing device for transformer partial discharge detection, electronic equipment and storage medium

Abstract

The invention discloses a capacitance parameter determination method and device of an iron core sensing device for transformer partial discharge detection, electronic equipment and a storage medium, and belongs to the technical field of sensor design, and the method comprises the steps: obtaining an iron core three-dimensional model of a transformer; performing electromagnetic simulation on the iron core three-dimensional model to generate antenna characteristic parameters of the transformer iron core under each frequency in a preset frequency band; determining a target detection frequency band of the transformer core according to the antenna characteristic parameters; repeatedly executing the parameter adjustment operation of the iron core sensing device until the current test frequency band covers the target detection frequency band, and determining the capacitance parameter of the iron core sensing device; therefore, by implementing the invention, the problem that the capacitance parameters of the iron core sensing device in the prior art are not accurately determined can be solved.

Description

Technical Field

[0001] This invention relates to the field of sensor design technology, specifically to a method, apparatus, electronic device, and storage medium for determining the capacitance parameters of a core sensing device for detecting partial discharge in transformers. Background Technology

[0002] In the technical approach of using transformer cores as antennas to detect partial discharge signals, a capacitive sensing device is typically required to couple the ultra-high frequency signal on the core grounding wire. The detection performance of this core sensing device, especially its core detection bandwidth, is directly determined by its capacitance parameters. Since the optimal receiving bandwidth for transformer cores as antennas varies depending on their structure and size, only by accurately determining the capacitance parameters of the sensing device to achieve a high degree of matching between its detection bandwidth and the optimal receiving bandwidth of a specific core can the sensitivity and accuracy of partial discharge detection be maximized. This is crucial for the reliable assessment of the safe operating status of transformers.

[0003] However, in the existing technology, there are still shortcomings in the method for determining the capacitance parameters of core sensing devices. The design of existing sensing devices often adopts standardized fixed parameters, and once the capacitance parameters are determined, they cannot be changed. This results in the inaccuracy of determining the capacitance parameters of core sensing devices, which in turn affects the reliability of transformer partial discharge detection. Summary of the Invention

[0004] This invention provides a method, apparatus, electronic device, and storage medium for determining the capacitance parameters of a core sensing device for transformer partial discharge detection, which can solve the problem of inaccurate determination of capacitance parameters in existing core sensing devices.

[0005] One embodiment of the present invention provides a method for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer. The core sensing device includes a metal electrode plate, which is composed of a coupling medium and a copper busbar in the core.

[0006] The method for determining the capacitance parameters includes:

[0007] Obtain the 3D model of the transformer core;

[0008] Electromagnetic simulation was performed on the three-dimensional model of the core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band.

[0009] Based on the antenna characteristic parameters, determine the target detection frequency band of the transformer core;

[0010] Repeat the core sensing device parameter adjustment operation until the current test frequency band covers the target detection frequency band, and determine the capacitance parameters of the core sensing device;

[0011] The parameter adjustment operation of the core sensing device includes:

[0012] Under the current test parameters, the current test frequency band of the iron core sensing device is obtained after the performance test is performed on the iron core sensing device; wherein, the initial test parameters are the preset distance value between the metal plate and the iron core copper busbar and the preset relative permittivity value of the coupling medium.

[0013] Determine whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, determine the current test parameters as the capacitance parameters of the core sensing device.

[0014] If not, adjust the distance between the metal electrode plate and the copper busbar of the iron core and change the relative permittivity of the coupling medium to update the current test parameters.

[0015] Furthermore, the three-dimensional model of the transformer core is obtained through the following methods:

[0016] Obtain the voltage level and transformer type of the transformer;

[0017] Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core;

[0018] Based on the structural and material properties of the transformer core, a three-dimensional model of the transformer core is constructed.

[0019] Furthermore, the electromagnetic simulation of the three-dimensional model of the transformer core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band includes:

[0020] Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

[0021] Furthermore, based on the antenna characteristic parameters, the target detection frequency band of the transformer core is determined, including:

[0022] When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core.

[0023] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0024] When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core.

[0025] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0026] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0027] An embodiment of the present invention provides a method and apparatus for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer, comprising: a transformer data acquisition module, an antenna characteristic parameter generation module, a target detection frequency band determination module, a core sensing device parameter adjustment module, and a parameter iterative adjustment module;

[0028] The transformer data acquisition module is used to acquire a three-dimensional model of the transformer core;

[0029] The antenna characteristic parameter generation module is used to perform electromagnetic simulation on the three-dimensional model of the core and generate antenna characteristic parameters of the transformer core at each frequency in the preset frequency band.

[0030] The target detection frequency band determination module is used to determine the target detection frequency band of the transformer core based on the antenna characteristic parameters.

[0031] The core sensing device parameter adjustment module is used to obtain the current test frequency band of the core sensing device after performance testing under the current test parameters. The initial test parameters are a preset distance between the metal plate and the core copper busbar and a preset relative permittivity of the coupling medium. The module determines whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, the current test parameters are determined as the capacitance parameters of the core sensing device. If not, the distance between the metal plate and the core copper busbar and the relative permittivity of the coupling medium are adjusted to update the current test parameters.

[0032] The parameter iterative adjustment module is used to repeatedly execute the core sensing device parameter adjustment module until the current test frequency band of the core sensing device matches the target detection frequency band, thereby determining the capacitance parameters of the core sensing device.

[0033] Furthermore, the device for determining the capacitance parameters of the core sensing device for transformer partial discharge detection also includes: a core three-dimensional model construction module;

[0034] The core 3D model construction module is used to obtain the voltage level and transformer type of the transformer;

[0035] Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core; based on the structural parameters and material properties of the transformer core, construct a three-dimensional model of the transformer core.

[0036] Furthermore, in the method and apparatus for determining the capacitance parameters of the core sensing device for transformer partial discharge detection, the antenna characteristic parameter generation module performs electromagnetic simulation on the three-dimensional model of the core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band, including:

[0037] Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

[0038] Furthermore, in the method for determining the capacitance parameters of the core sensing device for transformer partial discharge detection, the target detection frequency band determination module determines the target detection frequency band of the transformer core based on the antenna characteristic parameters, including:

[0039] When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core.

[0040] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0041] When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core.

[0042] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0043] Based on the above method embodiments, the present invention provides corresponding electronic device embodiments.

[0044] An embodiment of the present invention provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the capacitance parameter determination method of the core sensing device for transformer partial discharge detection as described in any of the above-described method embodiments.

[0045] Based on the above method embodiments, the present invention provides corresponding storage medium embodiments.

[0046] One embodiment of the present invention provides a storage medium storing a computer program thereon, wherein, when the computer program is running, it controls the device where the storage medium is located to execute the capacitance parameter determination method of the core sensing device for transformer partial discharge detection as described in any of the above-described method embodiments.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] This invention provides a method, apparatus, electronic device, and storage medium for determining the capacitance parameters of a core sensing device for partial discharge detection in transformers. The method first acquires a three-dimensional model of the transformer core and performs electromagnetic simulation on the model to generate antenna characteristic parameters. Then, based on these antenna characteristic parameters, it determines the target detection frequency band of the transformer core. Subsequently, the method repeatedly performs parameter adjustment operations: in each iteration step, it performs performance testing on the core sensing device with the current test parameters to obtain its current test frequency band and determines whether the test frequency band covers the target detection frequency band. If it covers the target frequency band, the current test parameters are determined as the final capacitance parameters; if not, the test parameters are updated by adjusting the distance between the metal plates and the copper busbars of the core and changing the relative permittivity of the coupling medium, and the iteration continues until a match is achieved.

[0049] This invention first uses electromagnetic simulation on a specific transformer core model to accurately obtain the optimal receiving frequency band for that particular core, solving the technical problem in existing technologies where sensing devices, due to the use of fixed standardized parameters, cannot achieve optimal frequency band matching with different cores. Based on this, the invention iteratively adjusts and tests the sensing device until its test frequency band matches the aforementioned optimal receiving frequency band, achieving precise setting of the core capacitance parameters of the sensing device. This method overcomes the shortcomings of existing technologies where capacitance parameters, once determined, cannot be changed, leading to insufficient detection accuracy, thereby significantly improving the sensitivity and reliability of transformer partial discharge signal detection. Attached Figure Description

[0050] Figure 1 This is a flowchart illustrating a method for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer, according to an embodiment of the present invention.

[0051] Figure 2 This is a schematic diagram of the structure of a core sensing device provided in an embodiment of the present invention.

[0052] Figure 3 This is a schematic diagram of the structure of a method for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer, provided by an embodiment of the present invention. Detailed Implementation

[0053] 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.

[0054] like Figure 1 As shown, in order to solve the problem that the capacitance parameters of the core sensing device in the prior art are not accurately determined, an embodiment of the present invention provides a method for determining the capacitance parameters of the core sensing device for partial discharge detection of transformers.

[0055] like Figure 2 As shown, the core sensing device includes a metal electrode plate; the metal electrode plate is composed of a coupling medium and a copper busbar in the core; the core sensing device is used to couple ultra-high frequency signals propagating on the grounding copper busbar of the transformer core. This device is a capacitive sensor with a coaxial shielding structure, installed on the grounding copper busbar of the transformer core. Its core sensing part is composed of three stacked layers: the bottom layer is the existing copper busbar on the transformer core; a ceramic plate serving as the coupling medium is covered on the outside of the copper busbar; and a metal electrode plate is then covered on the outside of the coupling medium. The copper busbar, coupling medium, and metal electrode plate together constitute a planar capacitor structure, whose main function is to couple ultra-high frequency signals propagating on the grounding copper busbar.

[0056] To ensure signal purity and detection accuracy, the aforementioned planar capacitor structure is completely encased within a shield made of metal. This shield effectively reduces the impact of external electromagnetic interference on the internal sensing elements. The metal plates are connected to an external processing unit via a signal adapter. This unit integrates signal processing circuitry, responsible for amplifying, filtering, and detecting the coupled weak signal to improve signal quality and availability. The entire device, through its compact design, achieves high-sensitivity pickup of high-frequency signals from the grounded copper busbar.

[0057] The method for determining capacitance parameters includes at least the following steps:

[0058] Step S1: Obtain the three-dimensional model of the transformer core;

[0059] In a preferred embodiment, the three-dimensional model of the transformer core is obtained in the following manner:

[0060] Obtain the voltage level and transformer type of the transformer;

[0061] Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core;

[0062] Based on the structural and material properties of the transformer core, a three-dimensional model of the transformer core is constructed.

[0063] Specifically, the first step of the method of this invention is to obtain a three-dimensional model of the transformer core. This three-dimensional model of the core is the basis for subsequent electromagnetic simulation and calculation of its antenna characteristic parameters; therefore, the accuracy of the model is directly related to the accuracy of the final parameter matching.

[0064] In a preferred embodiment, the process of obtaining the three-dimensional model of the transformer core described above can be executed specifically and systematically. First, the basic specifications of the transformer to be analyzed need to be obtained, mainly its voltage level and transformer type. The transformer type covers various structures commonly found in power systems, including single-phase two-column cores, three-phase three-column cores, or three-phase five-column core structures. After clarifying the voltage level and specific type, all structural and material property parameters of the transformer core can be determined accordingly. Structural parameters define the geometry of the core, such as the dimensions of the core columns and yoke; material property parameters define the electromagnetic properties of the core, such as the relative permeability and conductivity of the silicon steel sheets constituting the core. Finally, these determined structural and material property parameters are input into three-dimensional modeling software or electromagnetic simulation software to construct a three-dimensional core model corresponding to the actual transformer. In this way, it can be ensured that the constructed three-dimensional core model is highly consistent with the actual transformer core in terms of geometry and material properties, providing a reliable foundation for subsequent accurate electromagnetic simulation calculations.

[0065] Step S2: Perform electromagnetic simulation on the three-dimensional model of the core to generate antenna characteristic parameters of the transformer core at each frequency within a preset frequency band;

[0066] In a preferred embodiment, the step of performing electromagnetic simulation on the three-dimensional model of the transformer core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band includes:

[0067] Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

[0068] Specifically, after obtaining the three-dimensional model of the transformer core, the method of this invention performs electromagnetic simulation on the model to generate antenna characteristic parameters of the transformer core at various frequency points within a preset frequency band. This preset frequency band is typically the ultra-high frequency (UHF) band of interest in transformer partial discharge research, with a typical frequency range of 300MHz to 3GHz.

[0069] In a preferred embodiment, this electromagnetic simulation is performed using the Finite-Difference Time-Domain (FDTD) method. During the simulation, the simulation environment needs to be set to accurately simulate the physical process of partial discharge signals being received by the core. First, the simulation boundary condition is set to an absorbing boundary. This aims to simulate an infinitely large free space environment, thereby avoiding unnecessary reflections of electromagnetic waves at the simulation region boundary and ensuring that the simulation results only reflect the antenna characteristics of the core itself, unaffected by computational space interference. Second, the excitation source for the simulation is set to a Gaussian pulse waveform. Because Gaussian pulses have a wide spectral characteristic, they can effectively simulate the ultra-high frequency electromagnetic wave signals instantaneously generated by partial discharge events.

[0070] Under the above settings, calculations based on the finite-difference time-domain method on the three-dimensional model of the iron core yield a series of performance indicators, i.e., antenna characteristic parameters, when the iron core is used as a receiving antenna. These antenna characteristic parameters can be either the standing wave ratio (VSWR) or the scattering parameters (S-parameters), both of which can quantitatively characterize the degree of matching of the iron core with electromagnetic wave signals at different frequencies. Through this simulation process, the antenna performance data of the iron core within the entire preset frequency band can be accurately obtained, providing a scientific and reliable basis for subsequently determining its optimal target detection frequency band.

[0071] Step S3: Determine the target detection frequency band of the transformer core based on the antenna characteristic parameters;

[0072] In a preferred embodiment, determining the target detection frequency band of the transformer core based on the antenna characteristic parameters includes:

[0073] When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core.

[0074] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0075] When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core.

[0076] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0077] Specifically, after obtaining the antenna characteristic parameters of the transformer core through electromagnetic simulation, the method of this invention determines the target detection frequency band of the transformer core based on these parameters. The purpose of this step is to accurately select the frequency range from a wide range of preset frequency bands where the core has the highest signal reception efficiency as an antenna.

[0078] In a preferred embodiment, the determination process is performed in the following manner, depending on the type of antenna characteristic parameters used.

[0079] If the antenna characteristic parameter used is the Standing Wave Ratio (VSWR), then the simulated VSWR frequency curve needs to be compared with a preset VSWR threshold. VSWR is a physical quantity that measures the impedance matching between the antenna and the transmission line; the lower the value, the better the matching, the less signal reflection, and the higher the reception efficiency. Therefore, this method selects all frequency points on the curve with VSWR values ​​lower than the preset threshold as the target frequency for the transformer core. In specific applications, this VSWR threshold can be set based on experience or industry standards; a typical setting is 5.

[0080] If the antenna characteristic parameters used are scattering parameters (S-parameters), typically the return loss S11, then the scattering parameter-frequency curve is compared with a preset scattering parameter threshold. The scattering parameter directly quantifies the reflected power at the port; the lower the value (in decibels, the more negative), the less energy is reflected, and the more energy the antenna receives. Therefore, this method selects all frequency points on the curve where the scattering parameter values ​​are below the preset threshold as the target frequency for the transformer core. In specific applications, this scattering parameter threshold can be set to -10dB.

[0081] After determining all target frequencies using any of the methods described above, one or more frequency ranges can be formed. The set of these ranges constitutes the final target detection frequency band for the transformer core. This target detection frequency band accurately reflects the optimal receiving performance of a core with a specific structure, providing a clear and quantifiable optimization direction for subsequent parameter matching of sensing devices.

[0082] Step S4: Repeat the core sensing device parameter adjustment operation until the current test frequency band covers the target detection frequency band, and determine the capacitance parameters of the core sensing device; wherein, the capacitance parameters of the core sensing device include: the distance between the electrode plate and the grounding copper busbar, and the relative permittivity of the coupling medium;

[0083] In a preferred embodiment, the parameter adjustment operation of the core sensing device includes:

[0084] Under the current test parameters, the current test frequency band of the iron core sensing device is obtained after the performance test is performed on the iron core sensing device; wherein, the initial test parameters are the preset distance value between the metal plate and the iron core copper busbar and the preset relative permittivity value of the coupling medium.

[0085] Determine whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, determine the current test parameters as the capacitance parameters of the core sensing device.

[0086] If not, adjust the distance between the metal electrode plate and the copper busbar of the iron core and change the relative permittivity of the coupling medium to update the current test parameters.

[0087] Specifically, after determining the target detection frequency band of the transformer core, the final stage of the method of this invention involves setting the capacitance parameters of the core sensing device through a repeatedly executed closed-loop adjustment process to ensure that its final actual detection performance achieves optimal matching with the target detection frequency band. The capacitance parameters of the core sensing device are ultimately reflected in its physical structure, mainly including the distance between the metal plates and the grounding copper busbar, and the relative permittivity of the coupling medium filling the space between them.

[0088] In a preferred embodiment, the parameter adjustment operation of this core sensing device is specifically carried out as follows. The process begins with a sensing device having initial test parameters, which correspond to an initial electrode spacing and an initial selected coupling medium. First, the current test frequency band is obtained after performing physical performance tests on the core sensing device under these initial test parameters. This performance test typically involves inputting a sweep frequency signal to the device using a signal source and measuring its output response to obtain a curve characterizing its frequency response, thereby determining its effective test frequency band.

[0089] Subsequently, the obtained current test frequency band is compared with the target detection frequency band determined in the previous steps to determine whether the current test frequency band has effectively covered the target detection frequency band. If the determination result is yes, that is, the current performance of the sensing device has met the requirements, the iterative adjustment operation is terminated, and the current set of test parameters (i.e., the current electrode spacing and coupling medium dielectric constant) is determined as the final and optimal capacitance parameters of the sensing device.

[0090] If the judgment result is negative, it indicates that the frequency band is not yet matched, and the current test parameters need to be updated. The specific update method involves fine-tuning the physical structure of the sensing device. This adjustment method can be determined based on the deviation between the current test frequency band and the target detection frequency band, to achieve directional optimization. If the center frequency of the current test frequency band is higher than the target detection frequency band, it indicates that the equivalent capacitance value of the sensing device is too small. In this case, the capacitance value can be increased by appropriately reducing the distance between the metal plate and the copper busbar of the iron core, and by replacing it with a coupling medium with a higher dielectric constant, thereby shifting the detection frequency band towards a lower frequency. Conversely, if the center frequency of the current test frequency band is lower than the target, the opposite adjustment strategy is adopted, namely, increasing the distance and replacing it with a medium with a lower dielectric constant, to reduce the capacitance value and shift the detection frequency band towards a higher frequency. After updating the test parameters in the above way, the process will return to the step of obtaining the test frequency band, and the performance of the adjusted new structure will be tested and judged again, and this process will be repeated.

[0091] Through the above iterative optimization process, the theoretically optimal frequency band determined by the simulation analysis can be accurately mapped to the actual physical parameters of the sensing device, thereby ensuring that the sensing device can achieve the most efficient coupling and the most sensitive detection of the partial discharge signal of a specific transformer in practical applications.

[0092] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments.

[0093] like Figure 3 As shown, an embodiment of the present invention provides a method and apparatus for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer, comprising: a transformer data acquisition module, an antenna characteristic parameter generation module, a target detection frequency band determination module, a core sensing device parameter adjustment module, and a parameter iteration adjustment module;

[0094] The transformer data acquisition module is used to acquire a three-dimensional model of the transformer core;

[0095] The antenna characteristic parameter generation module is used to perform electromagnetic simulation on the three-dimensional model of the core and generate antenna characteristic parameters of the transformer core at each frequency in the preset frequency band.

[0096] The target detection frequency band determination module is used to determine the target detection frequency band of the transformer core based on the antenna characteristic parameters.

[0097] The core sensing device parameter adjustment module is used to obtain the current test frequency band of the core sensing device after performance testing under the current test parameters. The initial test parameters are a preset distance between the metal plate and the core copper busbar and a preset relative permittivity of the coupling medium. The module determines whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, the current test parameters are determined as the capacitance parameters of the core sensing device. If not, the distance between the metal plate and the core copper busbar and the relative permittivity of the coupling medium are adjusted to update the current test parameters.

[0098] The parameter iterative adjustment module is used to repeatedly execute the core sensing device parameter adjustment module until the current test frequency band of the core sensing device matches the target detection frequency band, thereby determining the capacitance parameters of the core sensing device.

[0099] In a preferred embodiment, the capacitance parameter determination device for the core sensing device for transformer partial discharge detection further includes: a core three-dimensional model construction module;

[0100] The core 3D model construction module is used to obtain the voltage level and transformer type of the transformer;

[0101] Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core; based on the structural parameters and material properties of the transformer core, construct a three-dimensional model of the transformer core.

[0102] In a preferred embodiment, the antenna characteristic parameter generation module performs electromagnetic simulation on the three-dimensional model of the transformer core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band, including:

[0103] Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

[0104] In a preferred embodiment, the target detection frequency band determination module determines the target detection frequency band of the transformer core based on the antenna characteristic parameters, including:

[0105] When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core.

[0106] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0107] When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core.

[0108] The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

[0109] It should be noted that the embodiments of the device described above correspond to the embodiments of the present invention described above, and can realize the capacitance parameter determination method of the core sensing device for transformer partial discharge detection described in any one of the above embodiments of the present invention. Furthermore, the embodiments of the device described above are merely illustrative. The modules described as separate components may or may not be physically separate, and the components shown as modules 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. In addition, in the accompanying drawings of the device embodiments provided by the present invention, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without creative effort.

[0110] Based on the above-described method embodiments of the present invention, a corresponding embodiment of an electronic device is provided.

[0111] An embodiment of the present invention provides an electronic device, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the capacitance parameter determination method of the core sensing device for partial discharge detection of transformers according to any one of the present invention, or, when the processor executes the computer program, it implements the functions of each module in the above-described device embodiments.

[0112] For example, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device.

[0113] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0114] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the terminal device via various interfaces and lines.

[0115] The memory can be used to store the computer programs and / or modules. The processor implements various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and by calling data stored in the memory. The memory may mainly include a program storage area and a data storage area. The program storage area may store the operating system, applications required for at least one function, etc.; the data storage area may store data created based on the use of the mobile phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0116] Based on the above method embodiments, the present invention provides corresponding storage medium embodiments;

[0117] Another embodiment of the present invention provides a storage medium including a stored computer program, wherein, when the computer program is running, the device where the storage medium is located executes any of the above-described methods for determining the capacitance parameters of a core sensing device for transformer partial discharge detection.

[0118] The aforementioned storage medium is a computer-readable storage medium, and the computer program includes computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0119] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0120] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for determining the capacitance parameters of a core sensing device for partial discharge detection in transformers, characterized in that, The iron core sensing device includes a metal electrode plate; the metal electrode plate is composed of a coupling medium and a copper busbar in the iron core. The method for determining the capacitance parameters includes: Obtain the 3D model of the transformer core; Electromagnetic simulation was performed on the three-dimensional model of the core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band. Based on the antenna characteristic parameters, determine the target detection frequency band of the transformer core; Repeat the core sensing device parameter adjustment operation until the current test frequency band covers the target detection frequency band, and determine the capacitance parameters of the core sensing device; The parameter adjustment operation of the core sensing device includes: Under the current test parameters, the current test frequency band of the iron core sensing device is obtained after the performance test is performed on the iron core sensing device; wherein, the initial test parameters are the preset distance value between the metal plate and the iron core copper busbar and the preset relative permittivity value of the coupling medium. Determine whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, determine the current test parameters as the capacitance parameters of the core sensing device. If not, adjust the distance between the metal electrode plate and the copper busbar of the iron core and change the relative permittivity of the coupling medium to update the current test parameters.

2. The method for determining the capacitance parameters of the core sensing device for partial discharge detection in transformers as described in claim 1, characterized in that, The 3D model of the transformer core can be obtained using the following methods: Obtain the voltage level and transformer type of the transformer; Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core; Based on the structural and material properties of the transformer core, a three-dimensional model of the transformer core is constructed.

3. The method for determining the capacitance parameters of the core sensing device for transformer partial discharge detection as described in claim 2, characterized in that, The electromagnetic simulation of the three-dimensional model of the transformer core, generating antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band, includes: Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

4. The method for determining the capacitance parameters of the core sensing device for partial discharge detection in transformers as described in claim 3, characterized in that, The step of determining the target detection frequency band of the transformer core based on the antenna characteristic parameters includes: When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core. The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core. When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core. The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

5. A device for determining the capacitance parameters of a core sensing device for partial discharge detection in a transformer, characterized in that, include: Transformer data acquisition module, antenna characteristic parameter generation module, target detection frequency band determination module, iron core sensing device parameter adjustment module, and parameter iterative adjustment module; The transformer data acquisition module is used to acquire a three-dimensional model of the transformer core; The antenna characteristic parameter generation module is used to perform electromagnetic simulation on the three-dimensional model of the core and generate antenna characteristic parameters of the transformer core at each frequency in the preset frequency band. The target detection frequency band determination module is used to determine the target detection frequency band of the transformer core based on the antenna characteristic parameters. The core sensing device parameter adjustment module is used to obtain the current test frequency band of the core sensing device after performance testing under the current test parameters; wherein, the initial test parameters are the preset distance value between the metal plate and the core copper busbar and the preset relative permittivity value of the coupling medium; it determines whether the current test frequency band of the core sensing device covers the target detection frequency band. If so, the current test parameters are determined as the capacitance parameters of the core sensing device; if not, the distance between the metal plate and the core copper busbar and the relative permittivity of the coupling medium are adjusted to update the current test parameters. The parameter iterative adjustment module is used to repeatedly execute the core sensing device parameter adjustment module until the current test frequency band of the core sensing device matches the target detection frequency band, thereby determining the capacitance parameters of the core sensing device.

6. The capacitance parameter determination device for the core sensing device for transformer partial discharge detection as described in claim 5, characterized in that, It also includes: a core 3D model building module; The core 3D model construction module is used to obtain the voltage level and transformer type of the transformer; Based on the voltage level and the transformer type, determine the structural parameters and material properties of the transformer core; based on the structural parameters and material properties of the transformer core, construct a three-dimensional model of the transformer core.

7. The capacitance parameter determination device for the core sensing device for transformer partial discharge detection as described in claim 6, characterized in that, The antenna characteristic parameter generation module performs electromagnetic simulation on the three-dimensional model of the core to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band, including: Using a Gaussian pulse waveform as the excitation source for electromagnetic simulation and an absorbing boundary as the boundary condition for electromagnetic simulation, electromagnetic simulation is performed on the three-dimensional model of the core based on the finite-difference time-domain method to generate antenna characteristic parameters of the transformer core at various frequencies within a preset frequency band; wherein, the antenna characteristic parameters are standing wave ratios or scattering parameters.

8. The capacitance parameter determination device for the core sensing device for transformer partial discharge detection as described in claim 7, characterized in that, The target detection frequency band determination module determines the target detection frequency band of the transformer core based on the antenna characteristic parameters, including: When the antenna characteristic parameter is the standing wave ratio (SWR), a frequency with an SWR lower than a preset SWR threshold is selected as the target frequency of the transformer core. The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core. When the antenna characteristic parameter is a scattering parameter, a frequency with a scattering parameter lower than a preset scattering parameter threshold is selected as the target frequency of the transformer core. The target detection frequency band of the transformer core is determined based on the target frequency of the transformer core.

9. An electronic device, characterized in that, The device includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the method for determining the capacitance parameters of a core sensing device for detecting partial discharge in a transformer as described in any one of claims 1 to 4.

10. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed, it controls the device containing the storage medium to perform the capacitance parameter determination method for a core sensing device for transformer partial discharge detection as described in any one of claims 1 to 4.

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