Transformer partial discharge detection method and device, computer equipment, readable storage medium and program product

Abstract

The invention relates to a transformer partial discharge detection method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring target parameters of a transformer; a preset sensor extends into the transformer box body from the dielectric window of the transformer box body for different penetration depths, and excitation partial discharge signals are injected into the transformer through preset equipment, so that voltage signals measured by the preset sensor under different penetration depths are obtained; determining a target penetration depth through a penetration depth fitting formula based on the voltage signal, the target parameter and a measurement parameter of a preset sensor; and extending a preset sensor into the transformer box body from the dielectric window of the transformer box body by the target penetration depth, and measuring a partial discharge signal of the transformer. By adopting the method, the sensor can measure the partial discharge signal of the transformer more accurately.

Description

Technical Field

[0001] This application relates to the field of power system technology, and in particular to a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for detecting partial discharge in a transformer. Background Technology

[0002] Partial discharge is a major cause of insulation degradation in electrical equipment and also an important indicator of insulation degradation. To ensure the overall safe operation of the system, partial discharge detection of electrical equipment is necessary; among these methods, ultra-high frequency (UHF) sensors are widely used for partial discharge detection due to their advantages such as high sensitivity and strong anti-interference capability.

[0003] In practical applications, UHF sensors typically receive partial discharge signals by being installed inside the dielectric window of the transformer housing. However, due to the complex internal structure of transformers, the propagation of partial discharge signals can be obstructed by components such as the core and windings, thus affecting signal transmission. Therefore, when UHF detection technology is applied to partial discharge detection in power transformers, the sensor's installation location is crucial. An improper installation location can severely reduce signal reception sensitivity, ultimately leading to distorted sensor calibration results. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, apparatus, computer equipment, computer-readable storage medium, and computer program product for detecting partial discharge in transformers that can determine the optimal installation position of the sensor, in order to address the above-mentioned technical problems.

[0005] Firstly, this application provides a method for detecting partial discharge in a transformer, comprising:

[0006] Obtain the target parameters of the transformer;

[0007] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0008] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0009] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0010] In one embodiment, the step of extending a preset sensor into the transformer tank from the dielectric window at different penetration depths, and injecting an excitation partial discharge signal into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths includes:

[0011] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0012] In one embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum and minimum frequencies of the signal received by the preset sensor; the determination of the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, using a penetration depth fitting formula, includes:

[0013] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0014] In one embodiment, determining the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, a first preset value, and a second preset value includes:

[0015] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0016] In one embodiment, determining the fitting coefficient based on the flange radius, the vertical distance from the dielectric window to the top of the transformer, the vertical distance from the dielectric window to the transformer bushing, a third preset value, and a fourth preset value includes:

[0017] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0018] In one embodiment, the method further includes:

[0019] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0020] Secondly, this application also provides a transformer partial discharge detection device, comprising:

[0021] The acquisition module is used to acquire the target parameters of the transformer;

[0022] The first measurement module is used to insert a preset sensor into the transformer tank from the medium window of the transformer tank to different penetration depths, and inject an excitation partial discharge signal into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0023] The calculation module is used to determine the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, using a penetration depth fitting formula.

[0024] The second measurement module is used to insert a preset sensor into the transformer housing from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0025] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0026] Obtain the target parameters of the transformer;

[0027] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0028] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0029] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0030] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0031] Obtain the target parameters of the transformer;

[0032] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0033] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0034] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0035] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0036] Obtain the target parameters of the transformer;

[0037] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0038] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0039] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0040] The aforementioned transformer partial discharge detection method, apparatus, computer equipment, computer-readable storage medium, and computer program product first acquire the target parameters of the transformer; then, a preset sensor is inserted into the transformer tank from the dielectric window to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths; based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula; by determining the target penetration depth, the most suitable position for placing the sensor in the transformer tank can be determined; by inserting the preset sensor into the transformer tank from the dielectric window to the target penetration depth, the partial discharge signal of the transformer can be accurately measured. Using the method of this application, by determining the target penetration depth of the sensor placed in the transformer tank, the sensor can more accurately measure the partial discharge signal of the transformer. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating a transformer partial discharge detection method in one embodiment;

[0043] Figure 2 This is a detailed flowchart of a transformer partial discharge detection method in one embodiment;

[0044] Figure 3 This is a structural block diagram of a transformer partial discharge detection device in one embodiment;

[0045] Figure 4 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0047] It should be noted that the terms "first," "second," etc., used in this application can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from the second element. The terms "comprising" and "having," and any variations thereof, used in this application, are intended to cover non-exclusive inclusion. The term "multiple" used in this application refers to two or more. The term "and / or" used in this application refers to one of the embodiments, or any combination of multiple embodiments.

[0048] In one embodiment, such as Figure 1 As shown, a method for detecting partial discharge in a transformer is provided. This embodiment illustrates the application of this method to a terminal. It is understood that this method can also be applied to a server, and to a system including both a terminal and a server, and implemented through interaction between the terminal and the server. In this embodiment, the method includes the following steps:

[0049] Step 102: Obtain the target parameters of the transformer.

[0050] Optionally, the target parameters can be the flange radius and the relative permittivity of the transformer oil, etc.

[0051] Step 104: Insert the preset sensor into the transformer tank at different penetration depths through the dielectric window of the transformer tank, and inject an excitation partial discharge signal into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0052] Among them, the excitation partial discharge signal is a signal that simulates the partial discharge of a transformer.

[0053] Optionally, the preset device can be the transformer bushing end screen; the bushing is composed of multiple layers of capacitive screens, and the end screen refers to the outermost capacitive screen of the bushing. Different penetration depths can be achieved, such as 1 cm, 5 cm, or 8 cm, etc., without limitation. The preset sensor can be an ultra-high frequency sensor.

[0054] Step 106: Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by using a penetration depth fitting formula.

[0055] Among them, the target penetration depth is the penetration depth through which the sensor can sensitively measure the partial discharge condition of the transformer.

[0056] Step 108: Insert a preset sensor into the transformer housing from the dielectric window to measure the target penetration depth and measure the partial discharge signal of the transformer.

[0057] Once the target penetration depth is obtained, when measuring the partial discharge signal of the transformer, a preset sensor is inserted from the dielectric window of the transformer tank into the target penetration depth inside the transformer tank to sensitively measure the partial discharge signal of the transformer.

[0058] The aforementioned transformer partial discharge detection method first obtains the target parameters of the transformer; then, a preset sensor is inserted into the transformer tank from the dielectric window to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths; based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula; by determining the target penetration depth, the most suitable position for placing the sensor in the transformer tank can be determined; by inserting the preset sensor into the transformer tank from the dielectric window to the target penetration depth, the partial discharge signal of the transformer can be accurately measured. Using the method of this application, by determining the target penetration depth of the sensor placed in the transformer tank, the sensor can more accurately measure the partial discharge signal of the transformer.

[0059] In an exemplary embodiment, the step of extending a preset sensor into the transformer tank from the dielectric window at different penetration depths, and injecting an excitation partial discharge signal into the transformer through a preset device to obtain voltage signals measured by the preset sensor at different penetration depths includes:

[0060] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0061] Optionally, the first penetration depth can be 1 cm and the second penetration depth can be 8 cm.

[0062] For example, a preset sensor is inserted 1 cm into the transformer tank from the dielectric window of the transformer tank, and an excitation partial discharge signal is injected into the transformer through the transformer bushing end screen to obtain the voltage signal measured by the UHF sensor at 1 cm; the UHF sensor is inserted 8 cm into the transformer tank from the dielectric window of the transformer tank, and an excitation partial discharge signal is injected into the transformer through the transformer bushing end screen to obtain the voltage signal measured by the UHF sensor at 8 cm.

[0063] In this embodiment, by placing the preset sensor at different penetration depths, the measurement sensitivity of the preset sensor at different penetration depths can be measured, which facilitates the subsequent search for the optimal penetration depth with the highest sensitivity.

[0064] In an exemplary embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum and minimum frequencies of the signal received by the preset sensor; the determination of the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor using a penetration depth fitting formula includes:

[0065] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0066] For example, the formula for calculating the fitted molecule is as follows:

[0067]

[0068] in, It is the voltage signal measured at the first penetration depth. This is the voltage signal measured at the second penetration depth. Based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value, the fitting denominator is determined; based on the flange radius, the vertical distance from the dielectric window to the top of the transformer, the vertical distance from the dielectric window to the transformer bushing, the third preset value, and the fourth preset value, the fitting coefficient is determined; the fitting numerator is divided by the fitting denominator to obtain the fitting factor, and the fitting factor is multiplied by the fitting coefficient to obtain the target penetration depth. The formula for calculating the target penetration depth d is as follows:

[0069] .

[0070] In this embodiment, by calculating the target penetration depth, the installation depth of the UHF sensor at the medium window of the transformer tank can avoid the obstruction and interference of the transformer's internal iron core, windings and other structures on the partial discharge signal to the greatest extent, ensuring that the sensor can stably receive the partial discharge signal with appropriate strength and complete waveform.

[0071] In an exemplary embodiment, determining the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, a first preset value, and a second preset value includes:

[0072] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0073] For example, the formula for calculating the fitting denominator is as follows:

[0074]

[0075] in, 1 is the first preset value, and 2 is the second preset value. It is the maximum frequency. It is the relative permittivity of transformer oil. It is the minimum frequency.

[0076] In this embodiment, by calculating the fitting denominator, it is convenient to calculate the target penetration depth in the subsequent calculation, so that the UHF sensor can stably receive partial discharge signals with appropriate intensity and complete waveform.

[0077] In an exemplary embodiment, determining the fitting coefficient based on the flange radius, the vertical distance between the dielectric window and the top of the transformer, the vertical distance between the dielectric window and the transformer bushing, a third preset value, and a fourth preset value includes:

[0078] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0079] The vertical distance between the dielectric window and the transformer bushing can be the vertical distance between the dielectric window and the transformer bushing from which the injected signal is received.

[0080] For example, the formula for calculating the fitting coefficient is as follows:

[0081]

[0082] in, It is the fourth preset value. yes, It is the vertical distance from the dielectric window to the top of the transformer. It is the vertical distance between the dielectric window and the transformer bushing. It is the third preset value.

[0083] In this embodiment, by calculating the fitting coefficient, it is convenient to calculate the target penetration depth in the subsequent calculation, so that the UHF sensor can stably receive partial discharge signals with appropriate intensity and complete waveform.

[0084] In one exemplary embodiment, the method further includes:

[0085] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0086] For example, if the second penetration depth is 8 cm and the calculated target penetration depth is 9 cm, then the target penetration depth is set to 8 cm.

[0087] In this embodiment, by setting the target penetration depth to be no less than the second penetration depth, it is possible to avoid affecting the normal operation of the transformer due to excessive sensor intrusion, thereby providing an accurate and reliable signal foundation for UHF sensor calibration, effectively reducing the distortion of calibration results caused by improper installation depth, and ensuring the accuracy of subsequent sensor performance evaluation.

[0088] In one exemplary embodiment, such as Figure 2 As shown, a method for detecting partial discharge in a transformer includes: acquiring target parameters of the transformer, including: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing. A preset sensor is inserted 1 cm into the transformer tank from the dielectric window, and an excitation partial discharge signal is injected into the transformer through the end screen of the bushing to obtain the voltage signal measured by the UHF sensor at 1 cm. The UHF sensor is then inserted 8 cm into the transformer tank from the dielectric window, and an excitation partial discharge signal is injected into the transformer through the end screen of the bushing to obtain the voltage signal measured by the UHF sensor at 8 cm. Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined using a penetration depth fitting formula, which is as follows:

[0089]

[0090] in, It is a voltage signal measured at a penetration depth of 1 cm. It is a voltage signal measured at a penetration depth of 8 cm. It is the maximum frequency. It is the relative permittivity of transformer oil. It is the minimum frequency. yes, It is the vertical distance from the dielectric window to the top of the transformer. This is the vertical distance between the dielectric window and the transformer bushing. If the calculated target penetration depth is not less than 8 cm, for example, 9 cm, then the target penetration depth is set to 8 cm. A preset sensor is inserted into the transformer tank from the dielectric window to measure the target penetration depth and the partial discharge signal of the transformer.

[0091] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages in other steps. It is understood that the steps in different embodiments can be freely combined as needed, and all non-contradictory solutions formed by such combinations are within the scope of protection of this application.

[0092] In one exemplary embodiment, such as Figure 3 As shown, a transformer partial discharge detection device is provided, comprising: an acquisition module 301, a first measurement module 302, a calculation module 303, and a second measurement module 304, wherein:

[0093] The acquisition module is used to acquire the target parameters of the transformer;

[0094] The first measurement module is used to insert a preset sensor into the transformer tank from the medium window of the transformer tank to different penetration depths, and inject an excitation partial discharge signal into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0095] The calculation module is used to determine the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, using a penetration depth fitting formula.

[0096] The second measurement module is used to insert a preset sensor into the transformer housing from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0097] In one embodiment, the first measurement module is further configured to:

[0098] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0099] In one embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum and minimum frequencies of the signal received by the preset sensor; the calculation module is further used for:

[0100] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0101] In one embodiment, the computing module is further configured to:

[0102] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0103] In one embodiment, the computing module is further configured to:

[0104] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0105] In one embodiment, the computing module is further configured to:

[0106] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0107] Each module in the aforementioned transformer partial discharge detection device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0108] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 4 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores the target penetration depth. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a transformer partial discharge detection method.

[0109] Those skilled in the art will understand that Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0110] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0111] Obtain the target parameters of the transformer;

[0112] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0113] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0114] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0115] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0116] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0117] In one embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum frequency and minimum frequency of the signal received by the preset sensor; the processor also implements the following steps when executing the computer program:

[0118] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0119] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0120] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0121] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0122] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0123] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0124] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0125] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0126] Obtain the target parameters of the transformer;

[0127] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0128] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0129] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0130] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0131] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0132] In one embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum frequency and minimum frequency of the signal received by the preset sensor; when the computer program is executed by the processor, it also implements the following steps:

[0133] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0134] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0135] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0136] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0137] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0138] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0139] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0140] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0141] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0142] Obtain the target parameters of the transformer;

[0143] A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths.

[0144] Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula.

[0145] The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

[0146] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0147] A preset sensor is inserted into the transformer tank through the dielectric window to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth; the preset sensor is then inserted into the transformer tank through the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

[0148] In one embodiment, the target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum frequency and minimum frequency of the signal received by the preset sensor; when the computer program is executed by the processor, it also implements the following steps:

[0149] Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitting numerator; determine the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value; determine the fitting coefficient based on the flange radius, the vertical distance of the dielectric window from the top of the transformer, the vertical distance of the dielectric window from the transformer bushing, the third preset value, and the fourth preset value; divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

[0150] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0151] Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; multiply the second preset value by the minimum frequency to obtain the first denominator; divide the first numerator by the first denominator to obtain the second denominator; calculate the cube root of the second denominator to obtain the fitted denominator.

[0152] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0153] Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; subtract the third preset value from the first coefficient to obtain the second coefficient; negative the second coefficient to obtain the third coefficient; and use the third coefficient raised to the power of the fourth preset value as the fitting coefficient.

[0154] In one embodiment, when the computer program is executed by a processor, it also performs the following steps:

[0155] If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

[0156] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0157] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0158] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for detecting partial discharge in a transformer, characterized in that, The method includes: Obtain the target parameters of the transformer; A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to different penetration depths, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths. Based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, the target penetration depth is determined by a penetration depth fitting formula. The preset sensor is inserted into the transformer tank from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

2. The method according to claim 1, characterized in that, The process of extending a preset sensor into the transformer tank from the dielectric window to different penetration depths, and injecting an excitation partial discharge signal into the transformer through a preset device to obtain voltage signals measured by the preset sensor at different penetration depths includes: A preset sensor is inserted into the transformer tank from the medium window of the transformer tank to a first penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the first penetration depth. A preset sensor is inserted into the transformer housing from the dielectric window to a second penetration depth, and an excitation partial discharge signal is injected into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at the second penetration depth; the second penetration depth is greater than the first penetration depth.

3. The method according to claim 2, characterized in that, The target parameters include: flange radius, relative permittivity of transformer oil, vertical distance from the dielectric window to the top of the transformer, and vertical distance from the dielectric window to the transformer bushing; the measurement parameters of the preset sensor include: the maximum and minimum frequencies of the signal received by the preset sensor; the determination of the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, using a penetration depth fitting formula, includes: Divide the voltage signal measured by the preset sensor at the second penetration depth by the voltage signal measured by the preset sensor at the first penetration depth to obtain the fitted molecule; Based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value, the fitting denominator is determined; Based on the flange radius, the vertical distance between the dielectric window and the top of the transformer, the vertical distance between the dielectric window and the transformer bushing, the third preset value, and the fourth preset value, the fitting coefficient is determined; Divide the fitting numerator by the fitting denominator to obtain the fitting factor, and multiply the fitting factor by the fitting coefficient to obtain the target penetration depth.

4. The method according to claim 3, characterized in that, The determination of the fitting denominator based on the maximum frequency, the minimum frequency, the relative permittivity of the transformer oil, the first preset value, and the second preset value includes: Multiply the first preset value by the maximum frequency and the relative permittivity of the transformer oil to obtain the first numerator; Multiply the second preset value by the minimum frequency to obtain the first denominator; Divide the first numerator by the first denominator to obtain the second denominator; Find the cube root of the second denominator to obtain the fitted denominator.

5. The method according to claim 3, characterized in that, The fitting coefficient is determined based on the flange radius, the vertical distance between the dielectric window and the top of the transformer, the vertical distance between the dielectric window and the transformer bushing, a third preset value, and a fourth preset value, including: Multiply the flange radius by the vertical distance between the dielectric window and the transformer bushing to obtain the second numerator; Divide the second numerator by the vertical distance between the dielectric window and the top of the transformer to obtain the first coefficient; Subtract the third preset value from the first coefficient to obtain the second coefficient; Negating the second coefficient yields the third coefficient; The third power of the fourth preset value is used as the fitting coefficient.

6. The method according to claim 2, characterized in that, The method further includes: If the target penetration depth is not less than the second penetration depth, then the second penetration depth shall be taken as the target penetration depth.

7. A transformer partial discharge detection device, characterized in that, The device includes: The acquisition module is used to acquire the target parameters of the transformer; The first measurement module is used to insert a preset sensor into the transformer tank from the medium window of the transformer tank to different penetration depths, and inject an excitation partial discharge signal into the transformer through a preset device to obtain the voltage signal measured by the preset sensor at different penetration depths. The calculation module is used to determine the target penetration depth based on the voltage signal, the target parameters, and the measurement parameters of the preset sensor, using a penetration depth fitting formula. The second measurement module is used to insert a preset sensor into the transformer housing from the medium window to measure the target penetration depth and the partial discharge signal of the transformer.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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