Hoisting simulation method and simulation device for wind power box transformer substation

Abstract

The invention provides a hoisting simulation method and simulation device for a wind power box transformer substation, and solves the technical problem that an effective quantification means for hoisting safety is lacked in the design process of an existing product. The method comprises the following steps: setting a three-dimensional model of a box-type substation collet; setting a fixed position of the hoisting column on the bottom support; setting remote positions of two ends of the sling according to the positions of the hoisting column and the sling; physical parameters are given to the bottom support, the hanging belt and the remote position to conduct stress simulation of the box transformer substation load, and simulation iteration is conducted according to stepping changes of the bottom support, the hanging belt and the hanging belt. By simulating the strength of the hoisting structure, the safety of the hoisting structure under the hoisting condition can be predicted and evaluated, so that the design is ensured to meet the safety standard. Potential problems can be found in the design stage through simulation, and the performance and reliability of the structure are improved by adjusting design parameters, optimizing structural layout, reducing material use and lowering cost; and the product development and optimization period is greatly shortened.

Description

Technical Field

[0001] The present invention relates to the field of hoisting technology, and in particular to a hoisting simulation method and a simulation device for a wind power box transformer. Background Art

[0002] With the increasing global demand for renewable energy, wind power generation has rapidly developed as a clean and sustainable form of energy. Wind turbine transformers are key components in wind power generation systems, responsible for converting and transmitting the electricity generated by wind turbines. Because wind turbine transformers are typically large and heavy, the hoisting process requires precise operation and strict safety measures. Hoisting adaptability is a crucial step in the design and installation of wind turbine transformers. Traditional hoisting methods often rely on manual experience, which not only increases uncertainty in the hoisting process but also heightens safety risks. However, blindly pursuing safety redundancy can lead to over-enhancement, increasing manufacturing and construction costs.

[0003] With the development of computer technology and simulation software, existing technologies using model simulation can improve product design efficiency and avoid potential risks. Therefore, it is necessary to use existing simulation technology to form a product design process for the safety of wind turbine box transformer hoisting, so as to improve the efficiency of hoisting operations and reduce construction costs and potential construction risks. Summary of the Invention

[0004] In view of the above problems, an embodiment of the present invention provides a hoisting simulation method and simulation device for a wind turbine box transformer, which solves the technical problem of lack of effective quantitative means for hoisting safety in the existing product design process.

[0005] The embodiment of the present invention provides a method for simulating the installation of a wind turbine box transformer, including:

[0006] Set up the 3D model of the box-type transformer base;

[0007] Set the fixed position of the hanging column on the bottom support;

[0008] Set the remote positions of both ends of the sling according to the position of the lifting column and the sling;

[0009] Physical parameters are assigned to the base, slings, and remote locations to simulate the load of the box transformer, and simulation iterations are performed based on the step changes of the base, slings, and slings.

[0010] In one embodiment of the present invention, the three-dimensional model for setting the bottom support of the box transformer includes:

[0011] Obtain the physical parameters of the base material;

[0012] Obtain the three-dimensional model of the base;

[0013] Obtain the bearing surface projection shape and mass distribution of the three-dimensional model of the box-type transformer load.

[0014] In one embodiment of the present invention, the fixing position of the hanging column on the bottom support includes:

[0015] At least four hanging columns are arranged at intervals along the circumference of the base, and the fixed positions of the hanging columns are determined on the three-dimensional model of the base;

[0016] Determine the length of the lifting column extending from the edge of the base

[0017] In one embodiment of the present invention, the step of setting the remote positions of the ends of the sling according to the positions of the sling posts and the sling includes:

[0018] Determine the upper remote position of each sling according to the lifting structure of the sling;

[0019] Determine the lower remote position of each lifting strap according to the fixed position on the lifting column.

[0020] In one embodiment of the present invention, assigning physical parameters to the base support, the sling, and the remote position to perform force simulation of the box transformer load, and performing simulation iteration according to the step-by-step changes of the base support, the sling, and the sling includes:

[0021] Set simulation conditions;

[0022] Conduct structural stress simulation during the lifting process and generate simulation results;

[0023] Modify simulation conditions to form simulation iterations.

[0024] In one embodiment of the present invention, the simulation condition setting includes:

[0025] - Assigning the physical parameters of the material to the three-dimensional model of the base to form a simulation model of the base;

[0026] - Assign the distributed mass to the box transformer load and determine the stacking form of the box transformer load on the base and the bearing surface;

[0027] -Determine the simulation type and stiffness setting of the sling 3D model;

[0028] -Mesh all 3D models;

[0029] - Fixed the upper remote position status of each sling.

[0030] The embodiment of the present invention provides a device for simulating the installation of a wind turbine box transformer, comprising:

[0031] A memory for storing program codes for the above-mentioned method for simulating the installation of a wind turbine box transformer;

[0032] A processor is configured to execute the program code.

[0033] The embodiment of the present invention provides a device for simulating the installation of a wind turbine box transformer, comprising:

[0034] The base model setting module is used to set the 3D model of the box-type transformer base;

[0035] The hoisting fixing setting module is used to set the fixed position of the hoisting column on the bottom bracket;

[0036] The sling endpoint setting module is used to set the remote positions of the two ends of the sling according to the position of the lifting column and the sling;

[0037] The lifting simulation analysis module is used to assign physical parameters to the base support, lifting straps and remote positions to simulate the load of the box transformer, and perform simulation iterations according to the step changes of the base support, lifting column and lifting straps.

[0038] The hoisting simulation method and device for wind turbine box transformers in the embodiments of the present invention simulate the strength of the hoisted structure to predict and assess its safety during hoisting, thereby ensuring that the design meets safety standards. Simulation can identify potential problems during the design phase, optimize the structural layout by adjusting design parameters, reduce material usage, lower costs, and improve structural performance and reliability. Traditional testing methods are time-consuming and costly, while simulation allows for rapid, multiple iterations within a computing environment, significantly shortening the product development and optimization cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The figure shows a flow chart of a method for simulating the installation of a wind turbine box transformer according to an embodiment of the present invention.

[0040] Figure 2 FIG2 is a schematic diagram showing the arrangement of main hoisting components during a simulation process of a hoisting simulation method for a wind turbine box transformer according to an embodiment of the present invention.

[0041] Figure 3 FIG2 is a schematic diagram showing the setting of physical parameters and effective load during the simulation process of a method for simulating the installation of a wind turbine box transformer according to an embodiment of the present invention.

[0042] Figure 4 FIG2 is a schematic diagram showing data display of simulation results during a simulation process of a hoisting simulation method for a wind turbine box transformer according to an embodiment of the present invention. FIG2 is a schematic diagram showing data display of simulation results during a simulation process of a wind turbine box transformer according to an embodiment of the present invention.

[0043] Figure 5 FIG2 is a schematic diagram of the structure of a hoisting simulation device for a wind turbine box transformer according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention is further described below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0045] An embodiment of the present invention is used for a method for simulating the installation of a wind turbine box transformer. Figure 1 As shown. Figure 1 In this embodiment, the present invention includes:

[0046] Step 100: Set up the 3D model of the box-type transformer base.

[0047] Those skilled in the art will understand that a wind turbine box-type substation, as part of a wind power generation system, typically includes a low-voltage cabinet, auxiliary transformer, high-voltage switchgear, box-type substation housing, and roof, among other payloads. Using the box-type substation support as the base load and gradually fixed payloads as variable loads, modular load positioning, fixation, and stacking can be achieved, improving the granularity of load simulation during hoisting simulation. Using a 3D model to digitize the box-type substation support allows for a three-dimensional grid-like structure, forming a foundation for simulation analysis of localized stresses.

[0048] Step 200: Set the fixed position of the hanging column on the bottom support.

[0049] In the embodiment of the present invention, the hanging columns are arranged at intervals on the outer edge of the base to form a horizontally retractable rigid fixed structure. The fixed positions of the hanging columns determined by manual experience can ensure the static stability of the base.

[0050] Step 300: Set the remote positions of both ends of the sling according to the positions of the lifting posts and the sling.

[0051] The position of the sling is related to the type of sling used during the hoisting process, the number of slings, and the relationships between slings. The flexible sling located between the hoisting column and the sling position determines the remote position of its endpoint relative to its center based on the number and method of attachment at each end.

[0052] Step 400: Assign physical parameters to the base, slings and remote positions to perform force simulation of the box transformer load, and perform simulation iterations according to the step changes of the base, slings and slings.

[0053] Those skilled in the art will understand that physical parameters include, but are not limited to, Young's modulus, Poisson's ratio, density, yield strength, tensile strength, friction coefficient, damping, specific heat capacity, thermal conductivity, and thermal expansion coefficient, reflecting material properties, deformation characteristics, stress characteristics, transfer characteristics, and temperature characteristics. By assigning these physical parameters, computer simulation technology is used to simulate the stress on the support and the deformation travel of the sling. Simultaneously, key parameters such as the transformer load, support structure, hoisting column position, and sling tolerance are modified stepwise to form an iterative simulation process, gradually conducting simulation analysis of the wind turbine transformer installation.

[0054] The hoisting simulation method for a wind turbine box transformer in an embodiment of the present invention simulates the hoisting structure during the construction process by focusing on the layout of concentrated load-bearing components and loads during the hoisting process. This method can predict and evaluate the safety of the hoisting structure during the hoisting process, thereby ensuring that the design meets construction safety standards. By adjusting design parameters based on the deformation characteristics of the base support, the upper and lower remote points of the sling connection, and the spring characteristics, the structural layout is optimized, reducing material usage and manufacturing costs while improving the performance and reliability of the structure. Rapid iteration significantly shortens the product development and optimization cycle.

[0055] like Figure 1 As shown, in one embodiment of the present invention, step 100 includes:

[0056] Step 110: Obtain physical parameters of the base material.

[0057] Material physical parameters include but are not limited to density, strength, yield strength, tensile strength, and damping. Material parameters are used to quantify the physical properties of the base during simulation.

[0058] Step 120: Obtain a three-dimensional model of the base.

[0059] The 3D model quantifies the structural characteristics of the base, including but not limited to intersections, intersections, tiling, and reinforcement. The 3D model of the base can be generated based on empirical models. Based on the 3D model, the base's 3D model can be gradually adjusted using a stepwise modification method.

[0060] Step 130: Obtain the load-bearing surface projection shape and mass distribution of the three-dimensional model of the box-type transformer load.

[0061] The box-type transformer load includes, but is not limited to, the low-voltage cabinet, auxiliary transformer, high-voltage switchgear, box-type transformer housing, and roof. The projected shape is the projection of the box-type transformer in the direction of the base support. The mass distribution is the distribution of the payload mass within the projected shape.

[0062] The hoisting simulation method for a wind power box transformer in an embodiment of the present invention decomposes the box transformer structure into modular components, and simplifies the box transformer model with a base according to the load-bearing characteristics of the hoisting. The structural mass of the box transformer's effective load is distributed by using various parts of the base, thereby reducing unnecessary calculations during the simulation process and improving the simulation accuracy of the structural quality.

[0063] like Figure 1 As shown, in one embodiment of the present invention, step 200 includes:

[0064] Step 210: Dispose at least four hanging columns at intervals along the circumference of the base, and determine the fixed positions of the hanging columns on the three-dimensional model of the base.

[0065] The relative positions of the four lifting columns are set based on expert experience. Expert experience indicates that the four lifting columns have a wide margin of static stability. Typically, during actual lifting, slings are fixed to the lifting columns, which are installed at the four positions of the box-type transformer base. The forces acting during the lifting process can be considered to be the lifting of the columns by the slings.

[0066] Step 220: Determine the length of the hanging column extending from the edge of the base.

[0067] The distance from the fixed position of the sling on the lifting column to the edge of the base is the length of the lifting column.

[0068] The hoisting simulation method for a wind turbine box transformer according to an embodiment of the present invention simplifies the force analysis of the base during the hoisting process according to the hoisting structure, and improves the structural optimization granularity of the hoisting simulation from two aspects of fixed position and fixed size.

[0069] like Figure 1 As shown, in one embodiment of the present invention, step 300 includes:

[0070] Step 310: Determine the upper remote position of each lifting strap according to the lifting structure of the lifting device.

[0071] The lifting structure of a sling can vary depending on how the upper ends of the slings are tied. This can lead to one sling per structure or multiple slings per structure. The height of the sling relative to the base can be calculated using the position of the lifting post, the sling length, and the relative position between the sling structure and the base's center of mass, determining the uppermost position of the sling.

[0072] Step 320: Determine the lower remote position of each lifting strap according to the fixed position on the lifting column.

[0073] The lower remote position is determined by the position of the hanging column, and usually corresponds to the hanging column one to one.

[0074] The hoisting simulation method for wind turbine box transformers in an embodiment of the present invention clarifies the positional relationship of the participating components in the bottom support force link, so that the bottom support force link path in the hoisting simulation process is completely calibrated, providing a complete mechanical architecture benchmark for parameter simulation and parameter binding of each component.

[0075] like Figure 1 As shown, in one embodiment of the present invention, step 400 includes:

[0076] Step 410: Setting simulation conditions, including:

[0077] -Assign the physical parameters of the material to the three-dimensional model of the base to form a simulation model of the base.

[0078] According to the selected material type, the corresponding material physical parameters are assigned to the structural elements in the base three-dimensional model to form the physical dimensions of the base three-dimensional model.

[0079] -Assign the distributed mass to the box transformer load and determine the stacking form of the box transformer load to the base and the bearing surface.

[0080] The direction of force applied by the box-type transformer load and the direction of force received by the bottom support structure are determined according to the direction of the earth's gravity. The force distribution of the bottom support structure is determined according to the bearing surface and distributed mass of the box-type transformer load.

[0081] -Determine the simulation type and stiffness settings for the sling 3D model.

[0082] The 3D model of the sling selects a spring type for simulation to reflect the elastic modulus of the sling and the stiffness physical parameters of the corresponding material.

[0083] -Mesh all 3D models.

[0084] The model is meshed according to the simulation accuracy requirements, for example using the patch conformal method, with the cell size divided into 15 mm and adaptive size used to form a tetrahedral or hexahedral network.

[0085] - Fixed the upper remote position status of each sling.

[0086] By fixing the motion state of the upper remote position, a fixed constraint is formed on the upper end of the sling. The fixed constraint simplifies the interference factors of the reflected force caused by the sling vibration and reduces the calculation amount.

[0087] Step 420: Perform structural stress simulation during the hoisting process and generate simulation results.

[0088] The simulation results are generated based on the deformation and stress changes of the base, and the military service graphics are classified and displayed.

[0089] Step 430: Modify the simulation conditions to form simulation iterations.

[0090] By gradually modifying the base support structure, lifting column position and lifting strap performance in small one-way steps, simulation iterations are formed to obtain the optimal safety margin to adapt to the overall load and mass distribution of the box-type transformer, and to achieve a balance between lifting safety and manufacturing and construction costs.

[0091] The wind turbine box transformer hoisting simulation method of this invention simulates safety factors during the box transformer design process, focusing on hoisting safety. This method quantifies the cost control process associated with hoisting safety, enabling the prediction and assessment of various safety conditions before actual hoisting, thereby selecting the optimal hoisting solution, configuring structural strength, and selecting the optimal structural form and profile type.

[0092] In practical applications, the simulation process formed by the hoisting simulation method of the above embodiment is based on the AnsysWorkbench platform to perform hoisting simulation. The settings of the main hoisting components in the simulation process are as follows: Figure 2 As shown. Figure 2 In the initial setup, the base support posture, the position of the lifting column, and the remote positions of the two ends of the sling are set. Specifically, the static structure module is dragged into the Ansys software interface, and the material parameters of the base support are imported into the engineering data of the static structure module for subsequent use; the 3D model of the base support to be simulated is imported; the connection point between the sling and the sling is simulated with the "remote point" ( Figure 2 In the example above, right-click "Model" and select "Insert Remote Point". In the first column "Range Limitation Method", select "Free Standing". At this time, you need to enter the X, Y, and Z coordinates. According to the height of the sling (usually a triangle) above the box-type transformer, the coordinates of the lifting column and the length of the sling, calculate the coordinates of the connection point between the sling and the sling, that is, the "remote point" and enter them in X, Y, and Z. Similarly, insert all the upper remote points (usually three). Continue to right-click "Model" and select "Insert Remote Point". In the first column "Range Limitation Method", select "Geometry Selection". The position coordinates of the lower remote point are determined by the geometric structure of the lifting column. Similarly, insert the lower remote points of all lifting columns.

[0093] The settings of the main lifting components during the simulation are as follows: Figure 3 As shown. Figure 3 In the simulation, set the type of sling simulation and the stacking of the transformer load. Specifically, right-click "Geometry" and select Insert Distributed Mass. Select the load-bearing surface of the transformer at the actual position of the transformer support. Enter the actual mass of the transformer in the total mass. Similarly, insert the loads applied to the support by the low-voltage cabinet I, auxiliary transformer G, high-voltage switch F, transformer housing, and top cover H. Right-click "Static Structure" to insert the standard earth gravity ( Figure 2In A), select the direction as vertical bottom support with the force surface downward; right-click "Connection" and select Insert "Spring", use "Spring" to simulate the sling, enter the actual stiffness of the sling in "Longitudinal Stiffness" (which can be obtained from the data search), and select the corresponding upper remote point and lower remote point of the sling connection in the "Reference" below.

[0094] During the simulation process, the data of the simulation results are displayed as follows Figure 4 As shown. Figure 4 The simulation shows the total deformation results. The specific simulation setting process is as follows: double-click "Model" to open the Mechanical module, click on the model in the "Geometry" drop-down menu, and assign the material parameters to the model in the task in the material column; right-click "Mesh" to insert the "Patch Conformal Method" and select all three-dimensional models, divide the unit size into 15mm, use adaptive size adjustment, right-click "Mesh" and click to generate the mesh; right-click "Static Structure" and select "Remote Displacement", select "Remote Point" in the range limitation method, select all the upper remote points set in the remote point, and enter the X component, Y component, Z component, rotation X, rotation Y, and rotation Z in the definition as 0. This step is used to simulate the fixed constraints of the upper sling lifting point; right-click "Solve" to select "Total Deformation", "Equivalent Stress" and other data and cloud maps that need to be output, right-click "Solve" again to select Solution; after the solution is completed, view and analyze the simulation results.

[0095] An embodiment of the present invention provides a device for simulating the installation of a wind turbine box transformer, comprising:

[0096] A memory, used to store program code for the processing process of the hoisting simulation method for a wind turbine box transformer according to the above embodiment;

[0097] The processor is used to execute the program code of the processing process of the hoisting simulation method for the wind turbine box transformer in the above embodiment.

[0098] The processor may be a DSP (Digital Signal Processor) digital signal processor, an FPGA (Field-Programmable Gate Array) field programmable gate array, an MCU (Microcontroller Unit) system board, an SoC (system on a chip) system board, or a PLC (Programmable Logic Controller) minimum system including I / O.

[0099] An embodiment of the present invention is used for a hoisting simulation device for a wind power box transformer. Figure 5 As shown. Figure 5 In this embodiment, the present invention includes:

[0100] The base model setting module 10 is used to set the three-dimensional model of the base of the box-type transformer;

[0101] The hoisting fixing setting module 20 is used to set the fixed position of the hoisting column on the bottom bracket;

[0102] The sling endpoint setting module 30 is used to set the remote positions of the two ends of the sling according to the positions of the lifting posts and the slings;

[0103] The hoisting simulation analysis module 40 is used to assign physical parameters to the base, slings and remote positions to perform force simulation of the box transformer load, and perform simulation iterations according to the step changes of the base, hoisting columns and slings.

[0104] like Figure 5 As shown, in one embodiment of the present invention, the base model setting module 10 includes:

[0105] Parameter acquisition unit 11, used to obtain physical parameters of the base material;

[0106] A model acquisition unit 12 is used to acquire a three-dimensional model of the base;

[0107] The mass acquisition unit 13 is used to obtain the bearing surface projection shape and mass distribution of the three-dimensional model of the box-type transformer load.

[0108] like Figure 5 As shown, in one embodiment of the present invention, the hoisting and fixing setting module 20 includes:

[0109] A position setting unit 21 is used to set at least four hanging columns at intervals in the circumferential direction of the base, and determine the fixed positions of the hanging columns on the three-dimensional model of the base;

[0110] The length setting unit 22 is used to determine the length of the hanging column extending from the edge of the base.

[0111] like Figure 5 As shown, in one embodiment of the present invention, the sling endpoint setting module 30 includes:

[0112] An upper position confirmation unit 31 is used to determine the upper remote position of each sling according to the lifting structure of the sling;

[0113] The lower position confirmation unit 32 is used to determine the lower remote position of each lifting strap according to the fixed position on the lifting column.

[0114] like Figure 5 As shown, in one embodiment of the present invention, the hoisting simulation analysis module 40 includes:

[0115] The condition setting unit 41 is used to set simulation conditions, including:

[0116] - Assigning the physical parameters of the material to the three-dimensional model of the base to form a simulation model of the base;

[0117] - Assign the distributed mass to the box transformer load and determine the stacking form of the box transformer load on the base and the bearing surface;

[0118] -Determine the simulation type and stiffness setting of the sling 3D model;

[0119] -Mesh all 3D models;

[0120] -Fix the upper remote position of each sling;

[0121] A simulation control unit 42 is used to simulate the structural stress during the hoisting process and generate simulation results;

[0122] The iteration control unit 43 is used to modify simulation conditions to form simulation iterations.

[0123] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for simulating the installation of a wind turbine box transformer, characterized in that: include: Set up the 3D model of the box-type transformer base; Set the fixed position of the hanging column on the bottom support; Set the remote positions of both ends of the sling according to the position of the lifting column and the lifting device; Physical parameters are assigned to the base, slings, and remote locations to simulate the load of the box transformer, and simulation iterations are performed based on the step changes of the base, slings, and slings.

2. The hoisting simulation method according to claim 1, wherein: The three-dimensional model of the box-type transformer bottom support is provided as follows: Obtain the physical parameters of the base material; Obtain the three-dimensional model of the base; Obtain the bearing surface projection shape and mass distribution of the three-dimensional model of the box-type transformer load.

3. The hoisting simulation method according to claim 1, wherein: The fixing position of the hoisting column on the bottom support is set as follows: At least four hanging columns are arranged at intervals along the circumference of the base, and the fixed positions of the hanging columns are determined on the three-dimensional model of the base; Determine the length of the lifting column extending from the edge of the base.

4. The hoisting simulation method according to claim 1, wherein: The step of setting the remote positions of both ends of the sling according to the positions of the lifting column and the sling comprises: Determine the upper remote position of each sling according to the lifting structure of the sling; Determine the lower remote position of each lifting strap according to the fixed position on the lifting column.

5. The hoisting simulation method according to claim 1, wherein: The step of assigning physical parameters to the bottom bracket, the sling, and the remote position to perform force simulation of the box transformer load, and performing simulation iteration according to the step changes of the bottom bracket, the sling, and the sling includes: Set simulation conditions; Conduct structural stress simulation during the lifting process and generate simulation results; Modify simulation conditions to form simulation iterations.

6. The hoisting simulation method according to claim 5, wherein: The simulation condition setting includes: - Assigning the physical parameters of the material to the three-dimensional model of the base to form a simulation model of the base; - Assign the distributed mass to the box transformer load and determine the stacking form of the box transformer load on the base and the bearing surface; -Determine the simulation type and stiffness setting of the sling 3D model; -Mesh all 3D models; - Fixed the upper remote position status of each sling.

7. A hoisting simulation device for a wind power box transformer, characterized in that: include: A memory for storing a program code for a processing process of a method for simulating the installation of a wind turbine box transformer according to any one of claims 1 to 6; A processor is configured to execute the program code.

8. A hoisting simulation device for a wind power box transformer, characterized in that: include: The base model setting module is used to set the 3D model of the box-type transformer base; The hoisting fixing setting module is used to set the fixed position of the hoisting column on the bottom bracket; The sling endpoint setting module is used to set the remote positions of the two ends of the sling according to the position of the lifting column and the sling; The lifting simulation analysis module is used to assign physical parameters to the base support, lifting straps and remote positions to simulate the load of the box transformer, and perform simulation iterations according to the step changes of the base support, lifting column and lifting straps.

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