Partial discharge signal positioning method based on power frequency voltage transformer and related products

Abstract

The application discloses a partial discharge signal positioning method based on a power frequency voltage transformer and related products, and belongs to the technical field of partial discharge signal positioning. The partial discharge signal positioning method based on the power frequency voltage transformer provided by the application comprises the following steps: S1, judging whether a partial discharge signal exists in a cable based on power frequency voltage transformers arranged at both ends of the cable, and collecting the time of the signal to both ends of the cable if the partial discharge signal exists; S2, respectively injecting oscillation signals from both ends of the cable, and recording the start time and arrival time of the oscillation signals injected into each end; S3, obtaining the length from the first end to the last end of the cable, and combining the time parameters and a pre-constructed partial discharge signal model to calculate the position of the partial discharge. The method is simple to operate and can accurately lock the specific position of the partial discharge by injecting the oscillation signals and combining the pre-constructed partial discharge signal model, thereby effectively guaranteeing the safe and stable operation of a power system.

Description

Technical Field

[0001] This invention relates to the field of partial discharge signal location technology, specifically to a partial discharge signal location method and related products based on a power frequency voltage transformer. Background Technology

[0002] In the safe and stable operation of power systems, partial discharge is a core characteristic signal reflecting internal insulation defects in power equipment and a key cause of insulation aging, deterioration, and even breakdown faults. To effectively locate partial discharges, the industry has developed various technical solutions, among which the most widely used include the ultra-high frequency (UHF) method, infrared detection method, ultrasonic method, and high-frequency current method. The UHF method uses UHF sensors to receive discharge signals and combines the time difference or amplitude difference of the signals to achieve location; it is widely used in the inspection of enclosed equipment such as GIS (Gas Insulated Switchgear). The infrared detection method utilizes the weak heat release effect accompanying partial discharge, using an infrared thermal imager to capture changes in the temperature field on the equipment surface to indirectly determine areas where discharge may exist. The ultrasonic method locates partial discharges by detecting ultrasonic signals generated by the discharge and has a certain application basis in the inspection of transformers, cables, and other equipment. The high-frequency current method involves installing a high-frequency current sensor on the equipment's grounding wire to collect the high-frequency current signal caused by partial discharge and then analyze the discharge location. This method is easy to install but is susceptible to line interference.

[0003] Although the aforementioned partial discharge location methods have been applied in actual operation and maintenance, numerous shortcomings have gradually emerged during practice. From an operational efficiency perspective, these methods rely on maintenance personnel to conduct point-by-point on-site inspections, requiring significant manpower and time costs for complex scenarios such as large substations and long-distance cable lines. Regarding location accuracy, the ultra-high frequency method is susceptible to the influence of sensor density and signal propagation path loss, exhibiting larger errors in open spaces or complex electromagnetic environments; the infrared detection method can only locate areas with abnormal temperatures and cannot precisely pinpoint the specific location of the discharge point; the ultrasonic method is limited by the rapid attenuation of ultrasonic waves in air and the tendency for propagation direction to deviate, resulting in significant deficiencies in both location range and accuracy; the high-frequency current method suffers from significant interference in grounding lines, making it difficult to effectively distinguish between discharge signals and interference signals, leading to a substantial reduction in location accuracy. These shortcomings make it difficult for existing methods to achieve accurate and reliable location of partial discharges, greatly hindering the early handling of potential power equipment faults.

[0004] Therefore, improving the reliability of partial discharge signal localization has become a technical challenge that urgently needs to be overcome by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a partial discharge signal localization method and related products based on a power frequency voltage transformer, so as to overcome the problem that the existing technology is difficult to achieve accurate and reliable localization of partial discharge.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution: This invention provides a method for locating partial discharge signals based on a power frequency voltage transformer, comprising the following steps: S1. Determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers installed at both ends of the cable. If the determination is yes, collect the time of the partial discharge signal to both ends of the cable and execute step S2. If the determination is no, execute step S1 again. S2. Inject oscillation signals from both ends of the cable and record the start and arrival times of the oscillation signals injected into each end. S3. Obtain the length of the cable from one end to the other. Combine the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable. Calculate the location of the partial discharge on the cable using a pre-built partial discharge signal model to achieve localization.

[0007] A further improvement of this invention is that, assuming the first end of the cable is end A and the last end of the cable is end B, the pre-constructed partial discharge signal model is specifically as follows:

[0008] in, This is the distance from the partial discharge location of the cable to end A; The time it takes for the partial discharge signal to reach terminal A; The time it takes for the partial discharge signal to reach terminal B; t1 is the length of the cable from end A to end B; t2 is the start time of the oscillation signal at end A; t3 is the start time of the oscillation signal at end B; and t4 is the arrival time of the oscillation signal at end B.

[0009] A further improvement of this invention is that the partial discharge signal model is constructed through the following steps: Expressions for the propagation time, propagation speed, and GPS synchronization time difference of the oscillation signal are constructed, and combined with the dual-end positioning formula, a partial discharge signal model is obtained.

[0010] A further improvement of this invention is that the propagation time expression of the oscillation signal is specifically as follows:

[0011] in, This represents the propagation time of the oscillating signal.

[0012] A further improvement of this invention is that the expression for the GPS synchronization time difference of the oscillation signal is specifically as follows:

[0013] in, This represents the GPS synchronization time difference of the oscillation signal.

[0014] A further improvement of this invention is that the expression for the propagation speed of the oscillating signal is specifically as follows:

[0015] in, This represents the propagation speed of the oscillating signal.

[0016] A further improvement of this invention is that the dual-end positioning formula is specifically as follows: .

[0017] The present invention also provides a partial discharge signal location system based on a power frequency voltage transformer, comprising: The first module is used to determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers set at both ends of the cable. The second module is used to collect the time from the partial discharge signal to both ends of the cable when there is a partial discharge signal in the cable, and to inject oscillation signals from both ends of the cable, and record the start time and arrival time of the oscillation signals injected into each end; The third module is used to obtain the length of the cable from one end to the other. Combining the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable, the module calculates the location of the partial discharge on the cable using a pre-built partial discharge signal model, thus achieving localization.

[0018] The present invention 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 implement the steps of the partial discharge signal localization method based on the power frequency voltage transformer described above.

[0019] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the partial discharge signal localization method based on a power frequency voltage transformer as described above.

[0020] Compared with the prior art, the positive and progressive effects of the present invention are as follows: The partial discharge signal localization method based on power frequency voltage transformers provided by this invention first uses a power frequency voltage transformer to preliminarily determine whether a partial discharge signal exists, and then uses an active injection of a specific oscillation signal for localization. Since the parameters of the injected signal are known and can be distinguished from background electromagnetic noise in terms of frequency and characteristics, combined with synchronous time measurement, random interference can be effectively filtered out, improving the accuracy and reliability of the localization results and fundamentally solving the problem of poor localization accuracy in traditional methods. Simultaneously, based on monitoring and activation using power frequency voltage transformers fixed at both ends of the cable, the entire localization process (signal judgment, oscillation signal injection, time recording, and calculation analysis) can be automatically triggered and completed, eliminating the need for manual point-by-point inspection. This method is particularly suitable for rapid, automated online monitoring and localization of long-distance cable lines and complex cable networks in large substations, improving response speed.

[0021] Furthermore, by injecting oscillation signals at both ends of the cable and recording precise time parameters, calculations are performed using a constructed partial discharge signal model. This model eliminates the positioning time difference and, based on the determinism and consistency of the partial discharge signal propagation within the cable, avoids errors caused by the uncertainty of the propagation path in open space, thereby improving the reliability of positioning. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0023] Figure 1 This is a flowchart illustrating the partial discharge signal localization method based on a power frequency voltage transformer according to the present invention. Figure 2 A schematic diagram showing the location where the oscillation signal is injected in this invention; Figure 3 This is a schematic diagram of an oscillation signal injection circuit used in one embodiment of the present invention; Figure 4 This is a schematic diagram of a field application in one embodiment of the present invention; Figure 5 This is a positioning effect diagram using the method of the present invention; Figure 6 This is a positioning effect diagram using the ultra-high frequency method; Figure 7 This is a schematic diagram of the partial discharge signal location system based on a power frequency voltage transformer according to the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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.

[0025] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0026] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0027] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0028] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This is an explanation of the present invention and not a limitation thereof.

[0030] Although partial discharge initially involves low energy and does not immediately cause equipment shutdown, prolonged partial discharge can continuously erode the molecular structure of insulating materials, leading to irreversible degradation of insulation performance. Ultimately, this can result in sudden insulation breakdown faults, severely impacting industrial production, residential electricity consumption, and socio-economic order. Therefore, accurate localization of partial discharge in power equipment, enabling early identification, location, and assessment of potential faults, is of paramount practical significance for improving power grid operation and maintenance, reducing fault rates, and ensuring the safe and economical operation of the power system.

[0031] Therefore, see Figure 1 This invention provides a method for locating partial discharge signals based on a power frequency voltage transformer, comprising the following steps: S1. Determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers installed at both ends of the cable. If the determination is yes, collect the time of the partial discharge signal to both ends of the cable and execute step S2. If the determination is no, execute step S1 again. S2. Inject oscillation signals from both ends of the cable and record the start and arrival times of the oscillation signals injected into each end. S3. Obtain the length of the cable from one end to the other. Combine the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable. Calculate the location of the partial discharge on the cable using a pre-built partial discharge signal model to achieve localization.

[0032] This invention achieves accurate, rapid, automatic, and reliable location of partial discharge hazards in power equipment through a signal injection mechanism and precise time synchronization measurement. Specifically, it first uses a power frequency voltage transformer to preliminarily determine the presence of partial discharge signals. Then, it uses an active injection of a specific oscillation signal for location. Since the parameters of the injected signal are known and can be distinguished from background electromagnetic noise in terms of frequency and characteristics, combined with synchronous time measurement, random interference can be effectively filtered out, greatly improving the accuracy and reliability of the location results and fundamentally solving the problem of poor accuracy in high-frequency current method location. By injecting oscillation signals at both ends of the cable and recording precise time parameters, a partial discharge signal model is used for calculation. This model is based on the determinism and consistency of signal propagation inside the cable, avoiding errors caused by the uncertainty of the propagation path in open space, thus achieving higher accuracy in positioning. At the same time, based on monitoring and activation by power frequency voltage transformers fixed at both ends of the cable, the entire positioning process (signal judgment, oscillation signal injection, time recording, calculation and analysis) can be automatically triggered and completed without the need for manual point-by-point inspection. It is particularly suitable for rapid and automated online monitoring and positioning of long-distance cable lines and complex cable networks in large substations, significantly reducing labor and time costs and improving operation and maintenance response speed.

[0033] This invention's method, based on the signal propagation characteristics in cable conductors, is unaffected by the complexity of equipment casings or internal structures. It is applicable to the precise location of partial discharges in power cables of various voltage levels, overhead lines (coupling methods must be considered), and the internal leads of transformers, GIS, and other equipment, making its applications more extensive and flexible. Furthermore, this method only requires the installation of power frequency voltage transformers at both ends of the cable (usually existing or easily installable locations), eliminating the need for numerous additional sensors in the middle of the cable or inside the equipment. The system structure is simple, installation and maintenance are convenient, and power frequency voltage transformers are mature technologies in power systems, making them easy to promote and reducing overall implementation costs.

[0034] Specifically, let the first end of the cable be A and the last end be B. The pre-constructed partial discharge signal model is as follows:

[0035] in, This is the distance from the partial discharge location of the cable to end A; The time it takes for the partial discharge signal to reach terminal A; The time it takes for the partial discharge signal to reach terminal B; t1 is the length of the cable from end A to end B; t2 is the start time of the oscillation signal at end A; t3 is the start time of the oscillation signal at end B; and t4 is the arrival time of the oscillation signal at end B.

[0036] In traditional two-end traveling wave positioning methods, the signal propagation speed is affected by factors such as cable type, insulation material, and temperature, making it difficult to accurately obtain or maintain a constant speed, which is one of the main sources of positioning errors. The partial discharge signal model pre-constructed in this invention, through ingenious mathematical derivation, directly calculates the discharge location using only the start and arrival time differences of the injected oscillation signals at both ends and the arrival time difference of the partial discharge signal, combined with the known total cable length. This eliminates the need for pre-measuring or calibrating the signal propagation speed, greatly enhancing the robustness of the positioning model, reducing positioning deviations caused by inaccurate parameters, and making the positioning results more stable and reliable.

[0037] Specifically, the partial discharge signal model is constructed through the following steps: Expressions for the propagation time, propagation speed, and GPS synchronization time difference of the oscillation signal are constructed, and combined with the dual-end positioning formula, a partial discharge signal model is obtained.

[0038] Specifically, the propagation time expression for the oscillating signal is as follows:

[0039] in, This represents the propagation time of the oscillating signal.

[0040] Specifically, the expression for the GPS synchronization time difference of the oscillation signal is as follows:

[0041] in, This represents the GPS synchronization time difference of the oscillation signal.

[0042] Specifically, the expression for the propagation speed of the oscillating signal is as follows:

[0043] in, This represents the propagation speed of the oscillating signal.

[0044] Specifically, the dual-end positioning formula is as follows: .

[0045] Based on the same inventive concept, the present invention also provides a partial discharge signal location system based on a power frequency voltage transformer, comprising: The first module is used to determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers set at both ends of the cable. The second module is used to collect the time from the partial discharge signal to both ends of the cable when there is a partial discharge signal in the cable, and to inject oscillation signals from both ends of the cable, and record the start time and arrival time of the oscillation signals injected into each end; The third module is used to obtain the length of the cable from one end to the other. Combining the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable, the module calculates the location of the partial discharge on the cable using a pre-built partial discharge signal model, thus achieving localization.

[0046] See Figure 2 The principle for locating partial discharge signals provided by this invention is as follows: Let the first end of the cable be A, and the last end be B. Inject oscillation signals from both ends and record the start time t1 of the oscillation signal at A, the start time t3 of the oscillation signal at B, and the arrival times t2 and t4 of the oscillation signal at A and B, respectively. Use the formula... The propagation time of the oscillating signal at both ends of the cable is calculated, where T represents the propagation time of the oscillating signal at both ends of the cable, i.e., the propagation time of the oscillating signal. The synchronization time difference generated by GPS at both ends includes t 1. t The time difference between 2, therefore, using the formula The GPS positioning time difference was calculated and then used as a formula. The propagation speed L of the oscillating signal is calculated. ABThis indicates the length of the cable from end A to end B. According to the double-ended positioning formula , in S3 and Substituting into the dual-end positioning formula, we can obtain the partial discharge location after eliminating the positioning time difference: .

[0047] like Figure 4 As shown, in a specific embodiment of the present invention, the partial discharge signal location method based on power frequency voltage transformer provided by the present invention can be used in the partial discharge location of cables with PT cabinets. After opening the PT cabinets at both ends and connecting the acquisition and oscillation signal injection unit to the power frequency voltage transformer, and then connecting it to the data storage and processing unit, the real-time acquisition and location of the partial discharge signal can be realized.

[0048] like Figure 5 The diagram shown is a positioning effect diagram of the present invention. It can be seen that the partial discharge location is at 374.7m, and the positioning result is clear. The positioning software calculates the amplitude and location information of the collected oscillation signal multiple times and displays it on the page in the form of a scatter plot. The area with the densest concentration of scatter points is the location where the partial discharge occurs.

[0049] like Figure 6 The image shows the positioning effect of the UHF method. It can be seen that the positioning effect is poor. There are scattered points that are falsely reported as partial discharge signals along the entire line. These scattered points may come from noise signals on the line and cannot be used for accurate positioning.

[0050] See Figure 7 In a specific embodiment of the present invention, the partial discharge signal positioning system based on a power frequency voltage transformer includes a power frequency voltage transformer, installed by a power operating company, which is an off-the-shelf voltage detection device; a high-pass filter circuit for extracting partial discharge signals from the actual voltage signal on the power grid side; a microprocessor with an integrated AD analog-to-digital converter module for implementing partial discharge signal acquisition and positioning functions, and controlling the injection of oscillation signals; a storage module for storing the partial discharge signal data and positioning data acquired by the microprocessor; a network communication module for uploading the acquired partial discharge signals to the cloud; a positioning module for providing partial discharge location information, using a GPS positioning module or a Beidou positioning module; an oscillation signal injection module for implementing positioning synchronization; and a power supply module that directly extracts voltage from the power frequency voltage transformer and rectifies it to power the above modules.

[0051] The power frequency voltage transformer is connected to a high-pass filter. After the power frequency signal is filtered out by the high-pass filter, the partial discharge signal is output to the microprocessor for further processing. The microprocessor sends a control signal to the oscillation signal injection module. The oscillation signal injection module is connected to the power frequency voltage transformer and injects the oscillation signal to the grid side through the power frequency voltage transformer.

[0052] like Figure 3 As shown, in a specific embodiment of the present invention, the partial discharge signal positioning system based on the power frequency voltage transformer uses an oscillation signal injection module to inject oscillation signals from both ends of the cable. The oscillation signal injection module is a variable frequency LC sine wave oscillation circuit that can adjust the frequency of the oscillation signal through a control signal sent by a microprocessor.

[0053] The partial discharge signal location system based on a power frequency voltage transformer provided by this invention requires no additional sensor installation. It directly collects partial discharge signals through the existing and widely installed voltage detection equipment, the power frequency voltage transformer, in the power grid. The equipment is easy to install, significantly improving the convenience of partial discharge location. The location algorithm used is a location method based on electromagnetic traveling waves, and the power frequency voltage transformer is a device capable of accurately measuring voltage signals. Therefore, this method can greatly improve the location accuracy of partial discharge. The partial discharge signal location system based on a power frequency voltage transformer can power its internal components by rectifying the voltage from the power frequency voltage transformer. Therefore, it can be used for a long time after installation without frequent inspections, requiring only periodic maintenance. The product provided by this invention has a network module, which can detect the presence and location of partial discharge in the line without going to the site. It can also operate under power, providing an online monitoring method.

[0054] Based on the same inventive concept, this application provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a partial discharge signal localization method based on a power frequency voltage transformer. The memory may include main memory, such as high-speed random access memory, or it may also include non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus, which may be an industry standard architecture bus, a peripheral component interconnection standard bus, an extended industry standard architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory stores the program; specifically, the program may include program code, which includes computer operation instructions. The memory may include main memory and non-volatile memory, and provides instructions and data to the processor.

[0055] Based on the same inventive concept, embodiments of this application provide a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the steps of the partial discharge signal localization method based on a power frequency voltage transformer. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include RAM (Random Access Memory) and / or cache memory, etc. The non-volatile memory may include ROM (Read-Only Memory), hard disk, flash memory, optical disk, magnetic disk, etc.

[0056] Based on the same inventive concept, this application provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions, which, when executed by a computer device, cause the computer device to perform the steps of the above-described method for locating partial discharge signals based on a power frequency voltage transformer.

[0057] Those skilled in the art will understand that embodiments of the present invention can be provided as methods or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM (Compact Disc Read-Only Memory), optical storage, etc.) containing computer-usable program code.

[0058] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, as well as combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer apparatus or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0059] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer device or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0060] These computer program instructions may also be loaded onto a computer device or other programmable data processing equipment to cause a series of operational steps to be performed on the computer device or other programmable equipment to produce a process implemented by the computer device, thereby providing instructions that execute on the computer device or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0061] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0062] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for locating partial discharge signals based on a power frequency voltage transformer, characterized in that, Includes the following steps: S1. Determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers installed at both ends of the cable. If the determination is yes, collect the time of the partial discharge signal to both ends of the cable and execute step S2. If the determination is no, repeat step S1. S2. Inject oscillation signals from both ends of the cable and record the start and arrival times of the oscillation signals injected into each end. S3. Obtain the length of the cable from one end to the other. Combine the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable. Calculate the location of the partial discharge on the cable using a pre-built partial discharge signal model to achieve localization. Let the first end of the cable be A, and the last end be B. The pre-constructed partial discharge signal model is as follows: in, This is the distance from the partial discharge location of the cable to end A; The time it takes for the partial discharge signal to reach terminal A; The time it takes for the partial discharge signal to reach terminal B; t1 is the length of the cable from end A to end B; t1 is the start time of the oscillation signal at end A. t2 is the arrival time of the oscillation signal at terminal A; t3 is the start time of the oscillation signal at terminal B; t4 is the arrival time of the oscillation signal at terminal B. The partial discharge signal model is constructed through the following steps: Constructing the propagation time of the oscillation signal Propagation speed and GPS synchronization time difference Combined with the double-ended positioning formula Thus, a partial discharge signal model was obtained.

2. The method for locating partial discharge signals based on a power frequency voltage transformer according to claim 1, characterized in that, The specific expression for the propagation speed of an oscillating signal is: in, This represents the propagation speed of the oscillating signal.

3. A partial discharge signal location system based on a power frequency voltage transformer, characterized in that, The method for locating partial discharge signals based on a power frequency voltage transformer as described in claim 1 or 2 includes: The first module is used to determine whether there is a partial discharge signal in the cable based on the power frequency voltage transformers set at both ends of the cable. The second module is used to collect the time from the partial discharge signal to both ends of the cable when there is a partial discharge signal in the cable, and to inject oscillation signals from both ends of the cable, and record the start time and arrival time of the oscillation signals injected into each end. The third module is used to obtain the length of the cable from one end to the other. Combining the start time, arrival time, and the time it takes for the partial discharge signal to reach both ends of the cable, the module calculates the location of the partial discharge on the cable using a pre-built partial discharge signal model, thus achieving localization.

4. 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 partial discharge signal localization method based on a power frequency voltage transformer as described in claim 1 or 2.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the partial discharge signal localization method based on the power frequency voltage transformer as described in claim 1 or 2.

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