Methods, devices, terminals, and storage media for simulating the motion of metal particle defects

Abstract

This invention discloses a method for simulating the motion of metal particles in an oil chamber, and discloses an apparatus, terminal and storage medium having the method. The method divides the motion of metal particles in the oil chamber into a first stage and a second stage, and performs force analysis on the two stages to determine the relationship between velocity and time, thereby obtaining the motion distance. Finally, the distances of the two stages are summed to realize the simulated motion of metal particle defects.

Description

Technical Field

[0001] This invention relates to the field of on-load tap changer status detection, and to a method, apparatus, terminal, and storage medium for simulating the movement of metal particle defects. Background Technology

[0002] In addition to its voltage regulation function, the tap changer of a transformer also functions as a network connector and load flow regulator, making it the core component for voltage regulation in a transformer. While a transformer is a static power distribution device, the tap changer, due to its voltage regulation requirements, is the only mechanically and electrically integrated device within the transformer that is frequently operated. With the increase in the number of voltage regulation operations, its operational malfunctions and failure rates also increase accordingly. According to the failure analysis in Table 1, the tap changer accounts for a relatively large proportion of failures, ranking fourth only after windings, bushings, and other components.

[0003] Table 1. Statistical Analysis of Transformer Accidents Nationwide from 2005 to 2011

[0004]

[0005] Faults in on-load tap changers can be broadly categorized into two types: insulation faults and mechanical faults. Among insulation faults, metal particle-induced discharge faults are a prominent type. This is primarily due to the rapid collision and closure of the moving and stationary contacts in the switching mechanism during operation, after the energy stored in the rapid mechanism is released. This violent collision inevitably causes the scattering of metal particle defects. Simultaneously, the heating of some components in the transformer tank triggers thermodynamic movement of the transformer oil, and these metal particle defects flow with the oil. These moving metal particle defects can distort the electric field in the tank. This distortion can range from causing minor partial discharges in the transformer oil to severe overheating of some components, or even burnout and explosion. Therefore, simulating the movement of metal particle defects in transformer oil is crucial.

[0006] To study the movement of metal particle defects in transformer oil within an on-load tap changer tank, a reasonable stress analysis of these defects is fundamental to experimental research. Previous simulations using the Navier-Stokes equations for the motion of metal particle defects have been cumbersome and have significantly hampered practical engineering applications. Therefore, to investigate insulation faults induced by metal particle defects in on-load tap changers, it is necessary to propose a simpler method that simulates the motion of metal particle defects using both particle size and oil flow velocity. Summary of the Invention

[0007] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for simulating the movement of metal particle defects in the oil chamber of an on-load tap changer. By using the size of the metal particle defects and the oil flow velocity, the rising motion state and maximum height can be roughly estimated, reducing the experimental difficulty of studying the discharge induced by the movement of metal particle defects in the oil tank of an on-load tap changer.

[0008] The present invention also proposes an oil chamber metal particle defect simulation motion device having the above-mentioned oil chamber metal particle defect simulation motion method.

[0009] The method for simulating the motion of metal particle defects in an oil chamber according to a first aspect of the present invention is characterized by comprising the following steps:

[0010] The movement of metal particles in the oil chamber is divided into the first stage and the second stage.

[0011] The force analysis of the metal particle defect motion in the first stage is calculated, and the relationship between the velocity and time of the metal particle defect motion in the first stage is obtained.

[0012] Based on the relationship between the movement speed and time of the metal particle defects in the first stage, the movement distance of the metal particles in the first stage is determined.

[0013] The force analysis of the metal particle defect motion in the second stage was performed to obtain the relationship between the velocity and time of the metal particle defect motion in the second stage.

[0014] Based on the relationship between the movement speed and time of the metal particle defects in the second stage, the movement distance of the metal particles in the second stage is determined;

[0015] The total height of the metal defect particles is obtained by summing the distances traveled in the first and second stages.

[0016] The method for simulating the motion of metal particle defects in the oil chamber according to embodiments of the present invention has at least the following beneficial effects: the present invention can divide the motion in the oil chamber into two stages, and then roughly estimate the rising motion state and maximum height by using the size of the metal particle defects and the oil flow velocity, thereby reducing the experimental difficulty of studying the discharge induced by the motion of metal particle defects in the on-load tap changer tank and providing a data basis for analyzing particle defects.

[0017] According to some embodiments of the present invention, in the first stage, the metal particles move upward with the oil flow and gradually accelerate to a certain speed before moving at a constant speed.

[0018] According to some embodiments of the present invention, in the second stage, the oil flow velocity gradually decreases as the distance the oil flow travels upward increases due to the metal particle defects.

[0019] The oil chamber metal particle defect simulation motion device according to a second aspect embodiment of the present invention is characterized in that it comprises:

[0020] The motion analysis module is used to divide the motion stages of metal particles in the oil chamber into the first stage and the second stage.

[0021] The first analysis module is capable of performing force analysis on the movement of metal particle defects in the first stage and calculating the relationship between the speed and time of the movement of metal particle defects in the first stage.

[0022] The first calculation module is able to determine the movement distance of the metal particles in the first stage based on the relationship between the movement speed and time of the metal particle defects in the first stage.

[0023] The second analysis module can perform force analysis on the motion of metal particle defects in the second stage and calculate the relationship between the velocity and time of the metal particle defect motion in the second stage.

[0024] The second calculation module determines the movement distance of the metal particles in the second stage based on the relationship between the movement speed and time of the metal particle defects in the second stage.

[0025] The summation module can sum the calculation results of the first stage and the distance traveled by the calculation results of the second stage to obtain the total height of the metal defect particles.

[0026] According to some embodiments of the present invention, in the first stage, the metal particles move upward with the oil flow and gradually accelerate to a certain speed before moving at a constant speed.

[0027] According to some embodiments of the present invention, in the second stage, the oil flow velocity gradually decreases as the distance the oil flow travels upward increases due to the metal particle defects.

[0028] A third aspect of the present invention provides a terminal comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for simulating the movement of metal particle defects in an oil chamber.

[0029] A fourth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for performing the above-described method for simulating the motion of metal particle defects in an oil chamber.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a schematic diagram of the steps of the method for simulating the movement of metal particle defects in an oil chamber provided in an embodiment of the present invention;

[0033] Figure 2 A schematic diagram illustrating an example of simulated defect movement of metal particles in the oil chamber of an on-load decomposition switch, provided in an embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the structure of the oil chamber metal particle defect simulation motion device provided in an embodiment of the present invention. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In transformer fault statistics, on-load tap changer failures are an important category. To investigate the causes of tap changer failures, simulations are primarily performed by calculating the movement of metal particles generated by the tap changer within the transformer oil. Traditional simulation methods are computationally intensive, which significantly limits their practical application in engineering. Therefore, there is an urgent need for a simpler method that can more easily simulate the movement of metal particles in insulating oil, facilitating practical engineering implementation.

[0038] Example 1

[0039] Reference Figure 1 This application provides a method for simulating the motion of metal particle defects in an oil chamber, the method comprising the following steps:

[0040] Step S100: Divide the movement stages of the metal particles in the oil chamber into the first stage and the second stage.

[0041] The movement of metal particle defects in transformer oil is analyzed. The movement of the metal particle defects can be roughly divided into two stages. In the first stage, the flow of transformer oil is mainly due to the heating of localized areas of the transformer oil caused by the heating of components in the upper part of the tank. This uneven temperature distribution leads to a stable upward flow of oil, and the metal particle defects move upward with the oil flow, gradually accelerating to a certain speed before reaching a uniform velocity. In the second stage, as the distance the oil flow travels increases, the oil flow velocity gradually decreases; therefore, we take the oil flow velocity in the second stage as 0. Under the influence of the drag force of the oil flow and gravity, the velocity of the metal particle defects gradually decreases until it reaches zero, at which point the defect reaches its maximum height. We calculate the total upward height of the two stages as the maximum height the metal particle defect rises.

[0042] Step S200: Based on Newton's second law, perform force analysis on the motion of metal particle defects in the first stage, and calculate the relationship between the motion speed and time of metal particle defects in the first stage.

[0043] Force analysis of the motion of metal particle defects in the first stage is performed using Newton's second law:

[0044]

[0045] Where F d It is the drag force of the oil flow, F 浮 The buoyancy force on the metal particle defect, v m v is the velocity of the metal particle defect. o Let ρ be the oil flow velocity, and G be the gravitational force acting on the metal particle defect. o The density of transformer oil is approximated as 900 kg / m³. ρ m Let C be the density of metal particle defects, approximately set at 2700 kg / m³. d C is the drag coefficient, which is usually considered to be... d It is closely related to the liquid Reynolds number Re, i.e., C d =16 / Re.

[0046] The Reynolds number of the transformer oil in the tap changer oil chamber can be approximated as 1000, therefore C can be obtained. d =0.016. The calculated velocity v of the metal particle defect is... m The relationship between the time t and the change is as follows:

[0047]

[0048] Step S300: Determine the movement distance of the metal particles in the first stage based on the relationship between the movement speed and time of the metal particle defects in the first stage.

[0049] Due to the velocity v of the metal particle defects in the first stage m Since the time integral does not converge, we calculate the defect velocity of the metal particle as it increases from 0 to 0.99v. b The distance traveled is taken as the distance s1 of the first stage of metal particle defect movement, that is:

[0050]

[0051] Step S400: Based on Newton's second law, perform force analysis on the motion of metal particle defects in the second stage, and calculate the relationship between the motion speed and time of metal particle defects in the second stage.

[0052] Force analysis of the motion of metal particle defects in the second stage is performed using Newton's second law:

[0053]

[0054] The value of each parameter is consistent with that in step S200, F d It is the drag force of the oil flow, F 浮 The buoyancy force on the metal particle defect, v m v is the velocity of the metal particle defect. o Let ρ be the oil flow velocity, and G be the gravitational force acting on the metal particle defect. o The density of transformer oil is approximated as 900 kg / m³. ρ m Let C be the density of metal particle defects, approximately set at 2700 kg / m³. d C is the drag coefficient, which is usually considered to be... d It is closely related to the liquid Reynolds number Re, i.e., C d =16 / Re.

[0055] The calculation yielded:

[0056]

[0057] Step S500: Based on the relationship between the movement speed and time of the metal particle defects in the second stage, determine the movement distance of the metal particles in the second stage.

[0058] The distance the metal particle defect travels in the second stage is the distance it covers from its final velocity at the end of the first stage to zero, i.e.:

[0059]

[0060] Step S600: Sum the distances traveled in the first stage and the second stage to obtain the total height of the metal defect particles.

[0061] s = s1 + s2 (7)

[0062] The above steps of this invention realize the speed and distance of metal particle defects rising with the oil flow inside the tap changer oil chamber, achieving a simple simulation of metal particle defects and reducing the difficulty for engineering practice.

[0063] Example 2

[0064] For ease of understanding, let's substitute the data described in Example 1, such as... Figure 2 As shown, an example of simulating the movement of metal particle defects in the oil chamber of an on-load disassembly switch is provided. The particle defect radius is 0.1 mm, and the oil flow velocity is vm = 1.8 m / s.

[0065] Substituting the values ​​into the solution, we can obtain the following for the first stage:

[0066]

[0067] In the second phase:

[0068]

[0069] Summing these values, we obtain the distance traversed by the metal particle defect:

[0070] s = s1 + s2 = 0.3058m (10)

[0071] Example 3

[0072] Another embodiment of this application provides a motion simulation device for metal particle defects in an oil chamber, such as... Figure 3 As shown, the device 30 includes: a motion analysis module 301, a first analysis module 302, a first calculation module 303, a second analysis module 304, a second calculation module 305, and a summation module 306.

[0073] The motion analysis module 301 is used to divide the motion stages of metal particles in the oil chamber into a first stage and a second stage.

[0074] The first analysis module 302 is able to perform force analysis on the motion of metal particle defects in the first stage based on Newton's second law, and calculate the relationship between the speed and time of the motion of metal particle defects in the first stage.

[0075] The first calculation module 303 is able to determine the movement distance of the metal particles in the first stage based on the relationship between the movement speed and time of the metal particle defects in the first stage.

[0076] The second analysis module 304 performs a force analysis on the motion of metal particle defects in the second stage based on Newton's second law, and calculates the relationship between the velocity and time of the metal particle defects in the second stage.

[0077] The second calculation module 305 determines the movement distance of the metal particles in the second stage based on the relationship between the movement speed and time of the metal particle defects in the second stage.

[0078] The summation module 306 can sum the distances traveled in the first and second stages to obtain the total height of the metal defect particles.

[0079] This application provides a simple method for simulating the motion of metal particles inside the oil chamber by abstracting the process of metal particle movement into two stages and using Newton's second law to analyze the motion process and calculate the motion mode of metal particles.

[0080] Another embodiment of this application provides a terminal, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for simulating the movement of metal particle defects in an oil chamber.

[0081] Specifically, the processor can be a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0082] Specifically, the processor connects to the memory via a bus, which may include a path for transmitting information. The bus can be a PCI bus or an EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc.

[0083] The memory may be ROM or other types of static storage devices that can store static information and instructions, RAM or other types of dynamic storage devices that can store information and instructions, or EEPROM, CD-ROM or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.

[0084] Optionally, the memory stores the code of the computer program that executes the scheme of this application, and the execution is controlled by the processor. The processor executes the application code stored in the memory to implement... Figure 3 The illustrated embodiment provides a motion simulation device for simulating metal particle defects in an oil chamber.

[0085] Another embodiment of this application provides a computer-readable storage medium storing computer-executable instructions for performing the above-described... Figure 1 The method for simulating the motion of metal particle defects in the oil chamber is shown.

[0086] The embodiments of this application divide the movement of metal particles in the oil chamber into two steps, then analyze their motion state, obtain the relationship between their speed and time, and thus simulate the distance of movement, achieving the effect of simply simulating the movement mode of metal particles in the oil chamber.

[0087] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0088] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0089] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for simulating the motion of metal particle defects in an oil chamber, characterized in that, Includes the following steps: The movement of metal particles in the oil chamber is divided into a first stage and a second stage. In the first stage, the metal particles move upward with the oil flow and gradually accelerate to a certain speed before moving at a constant speed. In the second stage, the oil flow velocity gradually decreases as the distance the metal particles rise increases. The force analysis of the metal particle defect motion in the first stage is calculated, and the relationship between the velocity and time of the metal particle defect motion in the first stage is obtained. Based on the relationship between the movement speed and time of the metal particle defects in the first stage, the movement distance of the metal particles in the first stage is determined. The force analysis of the metal particle defect motion in the second stage was performed to obtain the relationship between the velocity and time of the metal particle defect motion in the second stage. Based on the relationship between the movement speed and time of the metal particle defects in the second stage, the movement distance of the metal particles in the second stage is determined; The total height of the metal defect particles is obtained by summing the distances traveled in the first and second stages.

2. A motion simulation device for metal particle defects in an oil chamber, characterized in that, include: The motion analysis module is used to divide the motion of metal particles in the oil chamber into a first stage and a second stage. In the first stage, the metal particles move upward with the oil flow and gradually accelerate to a certain speed before moving at a constant speed. In the second stage, the metal particle defects are affected by the increased distance the oil flow travels, and the oil flow speed gradually decreases. The first analysis module is capable of performing force analysis on the movement of metal particle defects in the first stage and calculating the relationship between the speed and time of the movement of metal particle defects in the first stage. The first calculation module is able to determine the movement distance of the metal particles in the first stage based on the relationship between the movement speed and time of the metal particle defects in the first stage. The second analysis module can perform force analysis on the motion of metal particle defects in the second stage and calculate the relationship between the velocity and time of the metal particle defect motion in the second stage. The second calculation module determines the movement distance of the metal particles in the second stage based on the relationship between the movement speed and time of the metal particle defects in the second stage. The summation module can sum the calculation results of the first stage and the distance traveled by the calculation results of the second stage to obtain the total height of the metal defect particles.

3. A terminal, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method of claim 1.

4. A computer-readable storage medium storing computer-executable instructions for performing the method of claim 1.

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