Visualization System and Method for Transformer Outlet Device Based on Digital Twin

Abstract

The present invention discloses a visualization system and method for a transformer outgoing line device based on digital twin. The system includes an information support layer, a twin simulation layer, an application management layer, and a user interaction layer. The information support layer is respectively connected to the user interaction layer and the twin simulation layer, the twin simulation layer is connected to the application management layer, and the application management layer is connected to the user interaction layer. By combining the measured results of voltage and temperature sensors on the outgoing line device with the digital twin model, the present invention obtains the electric field and temperature field on the surface of the outgoing line device through multi-physical field simulation calculation. It solves the problem that traditional sensors cannot continuously collect the electric field and temperature field on the surface of the outgoing line device in real time, and realizes the continuous presentation and visualization of the electric field and temperature field of the transformer outgoing line device.

Description

Technical Field

[0001] The present invention belongs to the technical field of power transmission and transformation equipment condition monitoring, and particularly relates to a multi-physical field visualization system for a transformer outgoing line device based on a digital twin model. Background Art

[0002] The transformer outgoing line device is one of the bridges connecting the transformer winding and the outside world, and plays a very important role in the safe and stable operation of the transformer. In recent years, with the improvement of the voltage level of the power system, the insulation safety problem of the transformer outgoing line device has gradually become more and more prominent. How to comprehensively evaluate the insulation safety of the outgoing line device depends on the parameter acquisition and presentation of the electric field and temperature field. However, on the one hand, the direct measurement of the electric field is not easy to achieve, and on the other hand, since the outgoing line device is enclosed inside a metal shell, methods such as infrared temperature measurement cannot be used to obtain the temperature condition of the continuous surface of the outgoing line device. Therefore, how to combine the measured results of voltage and temperature sensors to achieve the continuous presentation of the electric field and temperature has become an urgent problem to be solved.

[0003] In recent years, with the rapid development of computer technology, big data and cloud computing have shown broader application value and prospects in the power industry. Digital twin technology is a technology that uses digital means to establish an equipment model approximately equivalent to a physical entity in a virtual environment and realizes the operation simulation of the entire life cycle of the physical entity equipment. How to apply digital twin technology to the visualization of multi-physical fields of transformer outgoing line devices has become an urgent problem to be solved. Summary of the Invention

[0004] The present invention provides a multi-physical field visualization system and method for a transformer outgoing line device based on a digital twin model. Through the measured results of voltage and temperature sensors on the transformer outgoing line device and in combination with the digital twin model, the visualization of multi-physical fields including the electric field and temperature field of the outgoing line device is realized.

[0005] To achieve the above object, the multi-physical field visualization system for a transformer outgoing line device based on a digital twin model of the present invention includes an information support layer, a twin simulation layer, an application management layer, and a user interaction layer; the information support layer is respectively connected to the user interaction layer and the twin simulation layer, the twin simulation layer is connected to the application management layer, and the application management layer is connected to the user interaction layer;

[0006] The information support layer: used to acquire and store the temperature, voltage, and current of the outgoing line device, as well as the operation information of the transformer and the outgoing line device; The twin simulation layer: used to perform 3D modeling on the transformer outgoing line device to obtain a 3D model of the transformer outgoing line device, and perform multi-physics field simulation calculations of the electric field and temperature field on the outgoing line device, outputting an electric field matrix, a voltage matrix, and a temperature field matrix; The application management layer: used to post-process and visualize the electric field matrix, voltage matrix, and temperature field matrix output by the twin simulation layer, establish 3D cloud maps of the electric field and temperature field and an isosurface model of the voltage, and display them on the 3D model of the transformer outgoing line device; The user interaction layer: used to display and process the transformer outgoing line device, 3D cloud maps of the electric field and temperature field, and the voltage isosurface model, and perform human-computer interaction.

[0007] Further, the information support layer includes a sensing device and a memory that are electrically connected, and the memory is used to store the operation information of the transformer and the outgoing line device; The operation information of the transformer and the outgoing line device includes the drawing of the outgoing line device, and the change curves of the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper with respect to temperature;

[0008] The sensing device includes a temperature sensor, a current sensor, a voltage sensor, and a thermometer, and the temperature sensor, current sensor, voltage sensor, and thermometer are all connected to the memory.

[0009] Further, there are multiple temperature sensors installed at different positions on the surface of the outgoing line device, there are two voltage sensors, which are respectively used to measure the voltage of the grading ring and the voltage of the bushing end screen, and the current sensor is used to measure the passing current of the grading ring.

[0010] A visualization method for a transformer outgoing line device based on digital twin includes the following steps:

[0011] S1. Obtain the drawing of the transformer and the outgoing line device, and the change curves of the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper with respect to temperature; Obtain sensor data, and the sensing data includes the temperature, voltage, current, and ambient temperature of the outgoing line device;

[0012] S2. Perform 3D modeling on the transformer outgoing line device according to the drawing of the outgoing line device to obtain a 3D model of the transformer outgoing line device, and perform electric field and temperature field simulation calculations on the outgoing line device according to the sensor data to obtain a temperature field matrix, an electric field matrix, and a temperature field matrix;

[0013] S3. Perform post-processing and visualization on the electric field matrix, voltage matrix, and temperature field matrix to obtain 3D cloud maps of the electric field and temperature field and an isosurface model of the voltage, and display them on the 3D model of the transformer outgoing line device;

[0014] S4. Display the three-dimensional cloud maps of the transformer outgoing line device, electric field and temperature field, and the voltage equipotential surface model for human-computer interaction.

[0015] Further, S2 includes the following steps:

[0016] S2.1: Conduct three-dimensional modeling on the transformer outgoing line device to obtain the three-dimensional model of the transformer outgoing line device;

[0017] S2.2: Organize and save the collected sensor data to obtain the internal temperature information matrix, voltage information, current information, and ambient temperature information;

[0018] S2.3: Retrieve the curves of the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper with respect to temperature, and query the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper according to the ambient temperature information; Set the material properties of the outgoing line device in the multi-physics field simulation software;

[0019] S2.4: Set the boundary conditions according to the voltage information and the material properties set in S2.3, and calculate the electric field distribution and joule heat of the outgoing line device to obtain the electric field matrix, joule heat matrix, and voltage matrix;

[0020] S2.5: Set the temperature boundary conditions with the temperature and joule heat matrix obtained by S1, solve the temperature field, and obtain the temperature field matrix;

[0021] Extract the temperature at the coordinates corresponding to the temperature sensors from the temperature field matrix to form a simulated temperature information matrix, subtract the simulated temperature information matrix from the internal temperature information matrix and calculate the relative error, and judge the magnitude relationship between the relative error and the threshold:

[0022] When the relative error is less than or equal to the set threshold, output the electric field matrix and voltage matrix obtained by S2.4 and the temperature field matrix obtained by S2.5;

[0023] When the relative error is greater than the set threshold, retrieve the curves of the electric field material properties and temperature field material properties with respect to temperature, query the corresponding electric field material properties and temperature field material properties from the curves according to the temperature in the temperature field matrix, jump to S2.3, and reset the material properties with the queried electric field material properties and temperature field material properties until the relative error is less than or equal to the set threshold.

[0024] Further, in S3, use three-dimensional drawing software to draw the voltage matrix, electric field matrix, and temperature field matrix. The voltage matrix is drawn into an equipotential surface three-dimensional model, and the electric field matrix and temperature field matrix are drawn into cloud Figure 3 three-dimensional models.

[0025] Further, in the three-dimensional cloud map in S3, the darker the color, the larger the value in the matrix.

[0026] Further, in S4, the human-computer interaction includes downloading historical data of temperature sensors, voltage sensors, and current sensors.

[0027] Further, in S4, the human-computer interaction includes changing the perspective by dragging and arbitrarily setting the cross-section to obtain electric field, voltage, and temperature information of different cross-sections.

[0028] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0029] Based on the measured results of the voltage and temperature sensors on the transformer outgoing line device, the present invention combines with the digital twin model, and obtains the electric field and temperature field on the surface of the outgoing line device through multi-physics field simulation calculation. It solves the problem that traditional sensors cannot continuously collect the electric field and temperature field on the surface of the outgoing line device in real time, realizes the continuous presentation and visualization of the electric field and temperature field of the transformer outgoing line device, can intuitively display the distribution of the electric field and temperature field during the operation of the transformer, and the monitoring personnel can intuitively perceive the electric field and temperature field through the visualization results output by the system. When it is observed that the electric field and temperature field are significantly higher than the normal operating state, maintenance work can be arranged in time.

[0030] Further, the present invention improves the accuracy of multi-physics field simulation calculation. By calculating the difference between the simulation calculation value and the sensed quantity, and updating the material parameters and iteratively calculating until the relative error is less than the set threshold, the present invention eliminates the interference of the non-linear change of the material parameters with temperature on the multi-physics field simulation calculation, and greatly improves the reliability of the multi-physics field simulation calculation.

[0031] The system of the present invention acquires and stores the temperature, voltage, and current of the outgoing line device, as well as the operation information of the transformer and the outgoing line device; uses the twin simulation layer to perform three-dimensional modeling on the transformer outgoing line device to obtain a three-dimensional model of the transformer outgoing line device, and performs multi-physics field simulation calculations on the electric field and temperature field of the outgoing line device, and outputs an electric field matrix, a voltage matrix, and a temperature field matrix; through the application management layer: for post-processing and visualizing the electric field matrix, voltage matrix, and temperature field matrix output by the twin simulation layer, establishing a three-dimensional cloud map of the electric field and temperature field and an isosurface model of the voltage, and displaying them on the three-dimensional model of the transformer outgoing line device; through the user interaction layer, it displays and processes the three-dimensional cloud map of the transformer outgoing line device, electric field, and temperature field and the voltage isosurface model, and performs human-computer interaction. Continuous presentation and visualization of the electric field and temperature field of the transformer outgoing line device. Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a flowchart of the calculation method of the twin simulation layer;

[0034] Figure 3 It is a schematic diagram of the information support layer structure;

[0035] Figure 4 It is an overall three-dimensional modeling diagram of the outgoing line device;

[0036] Figure 5 It is a half-section three-dimensional modeling diagram of the outgoing line device. Specific embodiments

[0037] In order to make the purpose and technical solutions of the present invention clearer and easier to understand. The following further describes the present invention in detail with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] Refer to Figure 1 , a multi-physical field visualization system for a transformer outgoing line device based on a digital twin model. This system is deployed on a server and specifically includes an information support layer, a twin simulation layer, an application management layer, and a user interaction layer. The information support layer is respectively connected to the user interaction layer and the twin simulation layer. The twin simulation layer is connected to the application management layer, and the application management layer is connected to the user interaction layer.

[0041] The main components of the information support layer include the transformer outlet device entity sensing equipment and the memory, and the output end of the sensing equipment is connected to the memory.

[0042] Refer to Figure 3 , the sensing equipment includes a temperature sensor, a voltage sensor, a current sensor and a thermometer. The temperature sensors adopted in the present invention are 5 in number and are distributed at different positions on the surface of the outlet device entity. There are 2 voltage sensors, which are respectively used to measure the voltage of the grading tube and the voltage of the bushing end screen. There is one current sensor, which is used to measure the passing current of the grading tube. Record the arrangement positions of the temperature sensors on the outlet device. The thermometer is used to measure the ambient temperature where the monitored transformer outlet device is located.

[0043] The sensing equipment is used to directly obtain temperature, voltage and current from the physical entity of the transformer outlet device, input and store the operation information of the transformer and the outlet device, and send the obtained temperature, voltage, current and the operation information of the transformer and the outlet device to the twin simulation layer. The operation information of the transformer and the outlet device includes the outlet device drawing, the historical work ledger, the factory test record and the historical maintenance report. In addition, the operation information of the outlet device also includes the change curves of the temperature with the electric field material parameters and the temperature field material parameters of copper, transformer oil and oil-impregnated paper. The electric field material parameters include conductivity and permittivity, and the temperature field material parameters include heat transfer coefficient and heating power. The work ledger information includes key information such as the production time of the transformer, the equipment model, the rated capacity, the rated current, the short-circuit impedance and the connection group; the historical maintenance report information includes all the maintenance reports of the transformer since it was put into operation; the electric field check calculation information is the calculation result of the electric field distribution during the design of the outlet device and is the design basis of the outlet device.

[0044] The memory is used to store the temperature, voltage and current data and input and store the operation information of the transformer and the outlet device. The memory can be a terminal device with storage and operation functions such as a server, a smart phone, a tablet computer, a portable computer, a desktop computer, etc. The memory includes at least one type of readable storage medium. The at least one type of readable storage medium can be a non-volatile storage medium such as a flash memory, a hard disk, a multimedia card, a card-type memory, etc.

[0045] The twin simulation layer is used to perform three-dimensional modeling on the transformer outlet device to obtain a three-dimensional model of the transformer outlet device, and perform multi-physical field simulation calculations on the outlet device including the electric field and the temperature field to obtain an electric field matrix, a voltage matrix and a temperature field matrix, and send the electric field matrix, the voltage matrix and the temperature field matrix to the application management layer.

[0046] The application management layer is used for post - processing and visualization of the electric field matrix, voltage matrix, and temperature field matrix output by the twin simulation layer. Using 3D drawing software, the electric field matrix E, voltage matrix U, and temperature field matrix T obtained by the twin simulation layer are summarized to establish a three - dimensional cloud map of the electric field and temperature field and an isosurface model of the voltage, and they are displayed on the 3D model of the transformer outlet device.

[0047] The methods for establishing the three - dimensional cloud maps of the electric field and temperature field are the same. Taking the method for establishing the three - dimensional cloud map of the electric field as an example, it is described as follows: Extract the maximum and minimum values and their corresponding coordinates from the electric field matrix. Draw a red pixel point at the maximum - value coordinate in space and a green pixel point at the minimum - value coordinate. Take the difference between the maximum and minimum values and perform linear interpolation. The colors of other points in the matrix are determined by the results of this linear interpolation;

[0048] The method for establishing the voltage isosurface model is: Extract the points with equal voltage values from the voltage matrix. Draw a plane that passes through all the points corresponding to this voltage value.

[0049] The user interaction layer is used to display and process the 3D cloud maps of the transformer outlet device, electric field, and temperature field, as well as the voltage isosurface model. Users can access the user interaction layer, change the viewing angle by dragging the mouse, and also perform cross - sectioning at any position on the model to obtain the voltage, electric field, and temperature field cloud maps of any cross - section. At the same time, it can meet the export of.csv format data for the electric field, voltage, and temperature field data, quantitatively characterize the voltage, electric field, and temperature field at different positions, and achieve human - machine interaction.

[0050] Embodiment 2

[0051] A multi - physical - field visualization method for a transformer outlet device based on a digital twin model includes the following steps:

[0052] S1. The information support layer directly obtains information from the physical entity of the transformer outlet device, receives the input and / or storage of the operation information of the transformer and the outlet device. The operation information of the transformer and the outlet device includes the outlet device drawings, historical work ledgers, electric field verification calculation results, and historical maintenance reports and other necessary operation information of the transformer. It also includes the temperature - change curves of the electric - field material parameters of copper, transformer oil, and oil - impregnated paper, as well as the temperature - change curves of the temperature - field material parameters of copper, transformer oil, and oil - impregnated paper.

[0053] S2. The twin simulation layer performs 3D modeling on the transformer outlet device according to the outlet device drawings, and conducts multi - physical - field simulation calculations including the electric field and temperature field on the outlet device, obtaining the temperature field matrix, electric field matrix, and temperature field matrix, and sending the temperature field matrix, electric field matrix, and temperature field matrix to the application management layer.

[0054] S3. The application management layer performs post - processing and visualization on the electric field matrix, voltage matrix, and temperature field matrix output by the twin simulation layer.

[0055] S4. The user interaction layer displays and processes the three - dimensional cloud maps of the transformer outlet device, electric field, and temperature field, and the voltage equipotential surface model, and conducts human - machine interaction.

[0056] Among them, referring to Figure 2 , in step S2, the main working steps of the twin simulation layer include:

[0057] S2.1: Conduct three - dimensional modeling of the transformer outlet device:

[0058] The transformer outlet device includes a grading tube, grading balls, and multi - layer insulation formed parts. First, obtain the outlet device drawing from the information support layer, and conduct three - dimensional modeling of the outlet device according to the dimensions provided by the outlet device drawing. Select an appropriate coordinate system during the modeling process. Read the temperature sensor coordinates according to the recorded temperature sensor positions in this coordinate system. Import the three - dimensional model of the transformer outlet device into commercial multi - physical - field simulation software. The three - dimensional modeling uses commercial drawing software, such as 3Dmax, UG, or SolidWorks, etc. The final model is stored in step format, and the obtained three - dimensional modeling diagrams are as shown in Figure 4 and Figure 5 shown.

[0059] S2.2: Organize and save the collected sensor data:

[0060] Integrate the coordinates of the temperature sensors read from S1 and the sensing quantity information transmitted back by the temperature sensors into an internal temperature information matrix. The internal temperature information matrix is a 5 - row and 4 - column matrix. The row vectors represent the parameters of each temperature sensor; the first three column vectors represent the x, y, and z coordinates of the temperature sensors, and the fourth column vector represents the readings of the temperature sensors. Subtract the grading tube voltage from the end - screen voltage at the same moment, and record the difference as voltage information. Record the current at the same moment as current information. Record the ambient temperature measured by the thermometer at the same moment as ambient temperature information. Save the internal temperature information matrix, voltage information, current information, and ambient temperature information in a one - to - one correspondence.

[0061] S2.3: Set the multi - physical - field material properties in the commercial multi - physical - field simulation software:

[0062] The material properties of the transformer outgoing line device that need to be set in the commercial multi-physics simulation software are divided into the material property parameters of the electric field and the material property parameters of the temperature field. The material property parameters of the electric field include conductivity and permittivity; the material property parameters of the temperature field include heat transfer coefficient and heat generation power. The material properties of different materials are different: the pressure equalizing pipes and pressure equalizing balls of the outgoing line device are made of copper, the multi-layer insulation forming parts are made of oil-impregnated paper, and the gaps between the multi-layer insulation forming parts are made of transformer oil. Retrieve the curves of the material properties of the electric field and the temperature field varying with temperature from the information support layer, and query the corresponding material properties of the electric field and the temperature field from the curves according to the ambient temperature information for setting.

[0063] S2.4: Electric field calculation:

[0064] Due to the existence of eddy current loss and leakage current, heat will be generated to varying degrees in the conductor and dielectric parts. Input the voltage information and current information obtained in S2.3 as boundary conditions into the commercial multi-physics simulation software. Set the entire area of the outgoing line device and its surrounding area as the solution domain in the commercial multi-physics simulation software, and perform mesh division on the solution domain. Solve to obtain the electric field matrix E, Joule heat matrix p, and voltage matrix U according to Equation (1).

[0065]

[0066] where D is the electric displacement vector, dS is the area element, q 0 is the electric charge quantity, dl is the distance element, dV is the volume element, and J is the current element.

[0067] S2.5: Temperature field calculation

[0068] Input the ambient temperature information obtained in step S2.2 and the Joule heat matrix obtained in step S4 as boundary conditions into the commercial multi-physics simulation software. Set the entire area of the outgoing line device and its surrounding area as the solution domain in the commercial multi-physics simulation software, and perform mesh division on the solution domain. Solve to obtain the temperature field matrix T according to Equation (2).

[0069]

[0070] where: z is the axial coordinate; r is the radial coordinate; ρ is the density of transformer oil; u is the axial velocity of transformer oil; v is the radial velocity of transformer oil; c p is the specific heat capacity; T is the temperature; S E is the heat released by the heat source; k is the solid thermal conductivity; λ is the thermal conductivity of transformer oil.

[0071] S2.6: Iterative calculation

[0072] Extract the temperature at the coordinates corresponding to the temperature sensors from the temperature field matrix T to form a simulated temperature information matrix. Subtract the simulated temperature information matrix from the internal temperature information matrix and calculate the relative error. When the relative error is less than or equal to 5%, it is considered that the simulation result meets the accuracy requirements, and output the electric field matrix E and voltage matrix U obtained in S2.4 and the temperature field matrix T obtained in S2.5. When the relative error is greater than 5%, retrieve the curves of the variation of the electric field material properties and temperature field material properties with temperature from the information support layer, and query the corresponding electric field material properties and temperature field material properties from the curves according to the temperature field matrix T. Return to S2.3 and reset the material properties with the queried electric field material properties and temperature field material properties. Iteratively calculate repeatedly until the relative error is less than or equal to 5%.

[0073] Specific application example:

[0074] S1: Build the information support layer. Input and store the operation information necessary for the transformer, such as the drawings of the outgoing line device, the historical work ledger, the factory test records, and the historical maintenance reports; the curves of the variation of the conductivity, permittivity, heat transfer coefficient, and heating power of copper, transformer oil, and oil-impregnated paper with temperature. Install 5 temperature sensors, which are evenly distributed along the circumferential direction at the turning of the outgoing line device; 2 voltage sensors, which are used to measure the voltage of the grading tube and the voltage of the bushing end screen respectively; 1 current sensor, which is used to measure the passing current of the grading tube. Install a thermometer in the transformer oil tank to measure the ambient temperature.

[0075] S2: Perform 3D modeling on the transformer outgoing line device: Obtain the drawings of the outgoing line device from the information support layer and perform 3D modeling on the outgoing line device according to the dimensions provided by the drawings of the outgoing line device.

[0076] S3: Read the data collected by the sensing devices and save the internal temperature information matrix, voltage information, current information, and ambient temperature information.

[0077] S4: Set the boundary conditions according to the voltage information and current information in the commercial finite element software, and calculate the electric field distribution and joule heat.

[0078] S5: Set the temperature boundary conditions in the commercial finite element software with the temperature sensing quantity returned by the temperature sensors and the joule heat matrix, solve the temperature field, and obtain the temperature field matrix.

[0079] S6: Iterative calculation. Extract the temperatures at the coordinates corresponding to the temperature sensors from the temperature field matrix to form a simulated temperature information matrix, subtract the simulated temperature information matrix from the internal temperature information matrix, and calculate the relative error. When the relative error is less than or equal to 5%, it is considered that the result of the simulation meets the accuracy requirements, and the electric field matrix E and voltage matrix U obtained in S4 and the temperature field matrix T obtained in S5 are output. When the relative error is greater than 5%, retrieve the curves of the variation of the electric field material properties and temperature field material properties with temperature from the information support layer, and query the electric field material properties and temperature field material properties corresponding to the temperature of the temperature field matrix T from the curves. Return to S4, and reset the material properties with the queried electric field material properties and temperature field material properties. Repeat the iterative calculation until the relative error is less than or equal to 5%.

[0080] S7: Build the application management layer, and draw the three-dimensional cloud maps of the temperature field and electric field and the voltage isolines. In this embodiment, the change in color from red to green is used to represent the change in the electric field, and the electric field at the green point is less than that at the red point. At the same time, the change in the depth of purple is used to represent the change in the temperature field, and the temperature at the dark purple point is higher than that at the light purple point.

[0081] S8: Build the user interaction layer for the user to perform post-processing operations.

[0082] The above content is only to illustrate the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. Visualization system of transformer outgoing line device based on digital twin, characterized in that, it includes an information support layer, a twin simulation layer, an application management layer and a user interaction layer; the information support layer is respectively connected to the user interaction layer and the twin simulation layer, the twin simulation layer is connected to the application management layer, and the application management layer is connected to the user interaction layer; The information support layer: is used to obtain and store the temperature, voltage and current of the outgoing line device, as well as the operation information of the transformer and the outgoing line device; The twin simulation layer: is used to perform three-dimensional modeling on the transformer outgoing line device to obtain a three-dimensional model of the transformer outgoing line device, and perform multi-physical field simulation calculations of the electric field and temperature field on the outgoing line device, and output an electric field matrix, a voltage matrix and a temperature field matrix; The application management layer: is used to post-process and visualize the electric field matrix, voltage matrix and temperature field matrix output by the twin simulation layer, establish three-dimensional cloud maps of the electric field and temperature field and an isosurface model of the voltage, and display them on the three-dimensional model of the transformer outgoing line device; The user interaction layer: is used to display and process the three-dimensional cloud maps of the transformer outgoing line device, electric field and temperature field and the voltage isosurface model, and perform human-computer interaction.

2. The visualization system of the transformer outgoing line device based on digital twin according to claim 1, characterized in that, the information support layer includes a sensing device and a memory connected electrically, and the memory is used to store the operation information of the transformer and the outgoing line device; the operation information of the transformer and the outgoing line device includes the drawing of the outgoing line device, and the variation curves of the electric field material parameters and temperature field material parameters of copper, transformer oil and oil-impregnated paper with respect to temperature; the sensing device includes a temperature sensor, a current sensor, a voltage sensor and a thermometer, and the temperature sensor, current sensor, voltage sensor and thermometer are all connected to the memory.

3. The visualization system of the transformer outgoing line device based on digital twin according to claim 2, characterized in that, there are multiple temperature sensors, which are installed at different positions on the surface of the outgoing line device, there are two voltage sensors, which are respectively used to measure the voltage of the grading tube and the voltage of the bushing end screen, and the current sensor is used to measure the passing current of the grading tube.

4. A visualization method of transformer outgoing line device based on digital twin, characterized in that, it includes the following steps: S1. Obtain the drawings of the transformer and the outgoing line device, and the variation curves of the electric field material parameters and temperature field material parameters of copper, transformer oil and oil-impregnated paper with respect to temperature; obtain sensor data, and the sensing data includes the temperature, voltage, current and ambient temperature of the outgoing line device; S2. Perform three-dimensional modeling on the transformer outgoing line device according to the drawing of the outgoing line device to obtain a three-dimensional model of the transformer outgoing line device, and perform electric field and temperature field simulation calculations on the outgoing line device according to the sensor data to obtain a temperature field matrix, an electric field matrix and a temperature field matrix; S3. Perform post-processing and visualization on the electric field matrix, voltage matrix and temperature field matrix to obtain three-dimensional cloud maps of the electric field and temperature field and an isosurface model of the voltage, and display them on the three-dimensional model of the transformer outgoing line device; S4. Display the three-dimensional cloud maps of the transformer outgoing line device, electric field and temperature field, and the voltage equipotential surface model for human-computer interaction.

5. The visualization method of the transformer outgoing line device based on digital twin according to claim 4, characterized in that, the S2 includes the following steps: S2.1: Perform three-dimensional modeling on the transformer outgoing line device to obtain a three-dimensional model of the transformer outgoing line device; S2.2: Sort out and save the collected sensor data to obtain an internal temperature information matrix, voltage information, current information, and ambient temperature information; S2.3: Retrieve the curves of the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper with respect to temperature, and query the electric field material parameters and temperature field material parameters of copper, transformer oil, and oil-impregnated paper according to the ambient temperature information; Set the material properties of the outgoing line device in the multi-physics field simulation software; S2.4: Set the boundary conditions according to the voltage information and the material properties set in S2.3, calculate the electric field distribution and joule heat of the outgoing line device to obtain an electric field matrix, a joule heat matrix, and a voltage matrix; S2.5: Set the temperature boundary conditions with the temperature and joule heat matrix obtained by S1, solve the temperature field to obtain a temperature field matrix; Extract the temperature at the coordinates corresponding to the temperature sensors from the temperature field matrix to form a simulated temperature information matrix, subtract the simulated temperature information matrix from the internal temperature information matrix and calculate the relative error, and judge the magnitude relationship between the relative error and the threshold: When the relative error is less than or equal to the set threshold, output the electric field matrix and voltage matrix obtained by S2.4 and the temperature field matrix obtained by S2.5; When the relative error is greater than the set threshold, retrieve the curves of the electric field material properties and temperature field material properties with respect to temperature, query the corresponding electric field material properties and temperature field material properties from the curves according to the temperature in the temperature field matrix, jump to S2.3, and reset the material properties with the queried electric field material properties and temperature field material properties until the relative error is less than or equal to the set threshold.

6. The visualization method of the transformer outgoing line device based on digital twin according to claim 4, characterized in that, in the S3, draw the voltage matrix, electric field matrix, and temperature field matrix through three-dimensional drawing software, draw the voltage matrix into an equipotential surface three-dimensional model, and draw the electric field matrix and temperature field matrix into cloud map three-dimensional models.

7. The visualization method of the transformer outgoing line device based on digital twin according to claim 4, characterized in that, in the three-dimensional cloud map, the darker the color, the larger the value in the matrix.

8. The visualization method of the transformer outgoing line device based on digital twin according to claim 4, characterized in that, in the S4, the human-computer interaction includes downloading the historical data of temperature sensors, voltage sensors, and current sensors.

9. The visualization method of the transformer outgoing line device based on digital twin according to claim 4, characterized in that, in the S4, the human-computer interaction includes changing the viewing angle by dragging and arbitrarily setting the cross-section to obtain the electric field, voltage, and temperature information of different cross-sections.

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