Stator bar main insulation bubble defect simulation method, system, device and medium

Abstract

The application discloses a stator bar main insulation bubble defect simulation method, system, device and medium, and belongs to the technical field of generator insulation state detection and evaluation. The method solves the problem that the prior art is difficult to controllably construct a bubble defect inside a true-type bar main insulation. The method comprises the following steps: obtaining bubble defect construction parameters; selecting an epoxy mica plate with a corresponding thickness as a defect setting layer based on a bubble height parameter and processing a through hole; constructing an A-B-A three-layer clamping structure composed of an upper support layer, the defect setting layer and a lower support layer as a bubble defect model; determining an embedding position in a main insulation layer based on a spatial position parameter; embedding the model in the position and adjusting a wrapping process during wrapping; and obtaining a stator bar containing a bubble defect through mold forming. The application realizes accurate and controllable simulation of the size, shape and spatial position of the bubble defect, and provides a standardized sample for generator insulation evaluation and partial discharge mechanism research.

Description

Technical Field

[0001] This application belongs to the field of generator insulation condition detection and evaluation technology, specifically involving a method, system, equipment and medium for simulating bubble defects in the main insulation of stator bars. Background Technology

[0002] The operational reliability of the stator bar main insulation is directly related to the safe and stable operation of large generator sets. Under the combined effects of long-term electrical, thermal, mechanical, and environmental stresses, defects such as bubbles and voids may gradually form inside the main insulation. These defects are prone to inducing internal partial discharge under operating voltage, thereby accelerating insulation aging and even causing insulation breakdown accidents.

[0003] Current partial discharge detection and diagnostic technologies heavily rely on typical defect sample data for defect type identification. However, in actual operating equipment, the types, sizes, and locations of defects are highly random, making it difficult to obtain structurally clear and reproducible defect samples. Existing artificial defect preparation methods mostly focus on surface discharge or end defects, lacking controllable simulation methods for internal bubble defects in the main insulation. In particular, it is difficult to achieve precise control of bubble size and spatial position without compromising the overall process consistency of the wire rod. For example, existing methods that directly embed hollow microspheres or foaming agents into the insulation layer struggle to precisely control the final bubble morphology and position, and the preparation process is highly random, failing to create standardized and reproducible defect samples.

[0004] Therefore, there is an urgent need to propose a method for simulating bubble defects that can construct a stable structure, adjustable size, controllable position, and controllable shape inside the main insulation of a real stator bar. This method would provide standardized test samples and data foundation for insulation structure optimization design, insulation condition assessment, and condition-based maintenance and fault diagnosis of large-scale energy equipment in the field of generator equipment manufacturing. Summary of the Invention

[0005] This application addresses the technical problem in the prior art that it is difficult to controllably and repeatedly construct bubble defects inside the main insulation of a real stator bar, thus making it impossible to systematically study the impact of bubble defects on partial discharge characteristics. It provides a method, system, device, and medium for simulating bubble defects in the main insulation of a stator bar.

[0006] To achieve the above objectives, this application adopts the following technical solution: In a first aspect, a method for simulating bubble defects in the main insulation of stator bars is provided, for constructing artificial bubble defects with controllable position, size, and shape inside the main insulation layer of a real stator bar, the method comprising: Obtain bubble defect construction parameters, which include at least bubble lateral dimension parameters, bubble height parameters, and bubble spatial position parameters; Based on the bubble height parameter, an epoxy mica sheet with a thickness corresponding to the bubble height parameter is selected as the defect setting layer, and based on the bubble lateral dimension parameter, through holes are processed in the defect setting layer to form a bubble cavity defined by the through holes. A bubble defect model is constructed. The bubble defect model is an ABA three-layer clamping structure, including: a lower support layer, a defect setting layer with the through holes, and an upper support layer. The upper support layer and the lower support layer are both complete epoxy mica sheets without through holes, which are used to seal the upper and lower openings of the bubble cavity during the subsequent compression molding process. Based on the bubble spatial position parameters, the embedding position of the bubble defect model is determined in the main insulation layer of the stator bar; During the wrapping process of the main insulation layer of the stator bar, the bubble defect model is embedded in the embedding position, and the insulation wrapping process is adjusted in the embedding area. A molding process is performed to stably encapsulate the bubble defect model inside the main insulation layer, thereby obtaining a stator bar containing bubble defects constructed according to the bubble defect construction parameters inside the main insulation layer, thus completing the simulation of bubble defects in the main insulation of the stator bar.

[0007] In one possible implementation, the lateral dimension parameter of the bubble includes the diameter of the through hole or an equivalent dimension parameter, and the geometry of the through hole is selected as one of a circle, an ellipse or a polygon according to the experimental design requirements.

[0008] In one possible implementation, a defect setting layer with a thickness corresponding to the bubble height parameter is selected based on the bubble height parameter, including: adjusting the height of the bubble cavity by changing the thickness of the defect setting layer while keeping the transverse dimension of the through hole unchanged, thereby achieving graded control of the bubble defect size.

[0009] In one possible implementation, the bubble spatial position parameters include radial position parameters and axial position parameters; The radial position parameter is used to arrange the bubble defect model at one of the following radial positions: at the interface between the conductor strand and the main insulation layer, in the middle region of the main insulation layer, or at the interface between the main insulation layer and the semiconductor layer. The axial position parameter is used to arrange the bubble defect model at multiple different positions along the axial direction of the straight section of the wire rod.

[0010] In one possible implementation, the adjustment of the insulation wrapping process for the embedded area includes: in the area where the bubble defect model is located, adjusting the half-overlapping method of the main insulation layer to a flat wrapping or thinning wrapping method to reduce the sudden change in local insulation thickness.

[0011] In one possible implementation, the total thickness of the upper support layer, the defect setting layer, and the lower support layer is less than the thickness of the main insulation layer of the stator bar.

[0012] In one possible implementation, the epoxy mica sheet is a complete sheet with a flat surface, uniform thickness, and no through holes.

[0013] Secondly, a system for simulating bubble defects in the main insulation of stator bars is provided, including: The parameter acquisition module is used to acquire bubble defect construction parameters, which include at least bubble lateral dimension parameters, bubble height parameters, and bubble spatial position parameters. The model building module is used to select an epoxy mica sheet with a thickness corresponding to the bubble height parameter as a defect setting layer according to the bubble height parameter, process through holes in the defect setting layer according to the bubble lateral dimension parameter, and construct an ABA three-layer clamping structure consisting of an upper support layer, a defect setting layer with the processed through holes, and a lower support layer as a bubble defect model. The position determination module is used to determine the embedding position of the bubble defect model in the main insulation layer of the stator bar according to the bubble spatial position parameters. The process control module is used to generate a wrapping adjustment scheme and molding process parameters for the main insulation layer of the stator bar based on the bubble defect model and the embedding position. The wrapping adjustment scheme is used to perform insulation wrapping process adjustment in the embedding area.

[0014] Thirdly, a computer device is provided, comprising: a processor and a computer-readable storage medium; A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program, which, when executed by the processor, implements the method for simulating bubble defects in the main insulation of stator bars as described in the first aspect.

[0015] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program adapted to be loaded by a processor and executed as described in the first aspect, the method for simulating bubble defects in the main insulation of stator bars. Compared with the prior art, this application has the following beneficial effects: This application constructs an ABA three-layer clamping structure as a bubble defect model. The upper and lower support layers support and isolate the middle bubble cavity during the multi-adhesive molding process, preventing epoxy resin from being injected into the through hole. This solves the technical problem in the prior art that bubble defects are easily filled and the structure is unstable during the molding process, and ensures the structural stability of the bubble defect after molding.

[0016] This application achieves precise and hierarchical control of bubble defect size by selecting a defect setting layer of corresponding thickness based on bubble height parameters and adjusting the cavity height while keeping the transverse dimension of the through hole constant. This solves the problems of uncontrollable and difficult-to-repeat defect size in traditional methods and ensures the comparability and repeatability of bubble defects among different wire rod samples.

[0017] This application achieves accurate simulation of the spatial position of bubble defects by precisely embedding the defect model into predetermined radial and axial positions during the wrapping process of the main insulation layer of a true-type bar based on the spatial position parameters of the bubble. This solves the problem of strong randomness of defect positions and inability to systematically study the influence of defects at different positions in the prior art, and provides standardized samples for comparative analysis of the influence of radial and axial position changes on partial discharge characteristics.

[0018] This application, through the combination of defect model structure and multi-adhesive molding process, enables three-dimensional controllable simulation of the size, shape and distribution location of internal bubble defects in the main insulation while ensuring the consistency of the overall manufacturing process of the bar. It provides repeatable and comparable engineering samples for the mechanism research and partial discharge characteristic analysis of different types of internal bubble defects, and significantly improves the accuracy of defect type identification in partial discharge detection and diagnosis technology.

[0019] In summary, this application provides key experimental methods and data foundation for the optimization of insulation structure, condition-based maintenance and fault diagnosis of energy equipment in the field of generator equipment manufacturing, which is of great significance for improving the operational reliability of large generator sets under complex conditions such as high voltage and strong electric fields. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A flowchart illustrating a method for simulating bubble defects in the main insulation of stator bars, provided in one embodiment of this application; Figure 2 is a structural schematic diagram of a stator bar and a bubble defect model provided in an embodiment of this application, wherein Figure 2(a) is a cross-sectional schematic diagram of the overall structure of the stator bar, and Figure 2(b) is an enlarged schematic diagram of the ABA three-layer structure of the bubble defect model; Figure 3 A schematic diagram of a stator bar main insulation bubble defect simulation system provided in one embodiment of this application; Figure 4 This is a diagram illustrating the internal structure of a computer device according to one embodiment of this application.

[0022] Explanation of reference numerals in the attached diagram: 1. Conductor strand; 2. Main insulation layer; 3. Semiconductor layer; 4. Bubble defect model; 41. Upper support layer; 42. Defect setting layer; 43. Lower support layer; 44. Through hole. Detailed Implementation

[0023] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0025] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] To solve the above problems, such as Figure 1 As shown, this application provides a method for simulating bubble defects in the main insulation of stator bars.

[0030] S1, obtain the bubble defect construction parameters.

[0031] In one embodiment of this application, the bubble defect construction parameters include at least the bubble lateral dimension parameter, the bubble height parameter, and the bubble spatial position parameter. These parameters are determined according to the experimental design scheme and are used to guide the subsequent construction and positioning of the bubble defect model 4.

[0032] Specifically, the bubble lateral dimension parameter is used to determine the projected size of the bubble defect in the horizontal direction, for example, it can be set to a circular through hole 44 with a diameter of 1 cm; the bubble height parameter is used to determine the height of the bubble defect in the vertical direction, for example, it can be set to 0.2 mm, 0.4 mm or 0.6 mm; the bubble spatial position parameters include radial position parameters and axial position parameters, which are used to determine the specific position of the bubble defect inside the main insulation layer 2.

[0033] S2, select the defect setting layer 42 based on the bubble height parameter, and process the through hole 44 structure based on the bubble lateral dimension parameter.

[0034] In one embodiment of this application, based on the bubble height parameter, an epoxy mica sheet with a thickness corresponding to the bubble height parameter is selected as the defect setting layer 42. For example, if the bubble height parameter is 0.2 mm, an epoxy mica sheet with a thickness of 0.2 mm is selected; if the bubble height parameter is 0.4 mm, a sheet with a thickness of 0.4 mm is selected; and if the bubble height parameter is 0.6 mm, a sheet with a thickness of 0.6 mm is selected.

[0035] Simultaneously, based on the lateral dimension parameter of the bubble, a through hole 44 is machined in the middle of the defect setting layer 42. The lateral dimension of the through hole 44 corresponds to the lateral dimension parameter of the bubble, for example, a circular through hole with a diameter of 1 cm. The geometry of the through hole 44 can be selected as a regular geometric shape such as a circle, ellipse, or polygon according to the experimental design requirements, so as to achieve controllable construction of the bubble defect shape.

[0036] In some embodiments of this application, while keeping the lateral dimension of the through-hole 44 constant, the height of the bubble cavity is adjusted by changing the thickness of the defect setting layer 42, thereby achieving graded control of the bubble defect size. The beneficial effects of this technical feature are: ensuring the comparability and repeatability of bubble defects between different wire rod samples, while keeping the lateral projected area of ​​the bubble defects consistent, which facilitates the study of the influence of bubble height (i.e., volume) on partial discharge characteristics.

[0037] S3, Construct bubble defect model 4.

[0038] As shown in Figure 2(b), a bubble defect model 4 is constructed. This bubble defect model 4 is an ABA three-layer clamping structure, including: a lower support layer 43, a defect setting layer 42 with the through hole 44, and an upper support layer 41. The upper support layer 41 and the lower support layer 43 are both complete epoxy mica sheets without through holes 44, with uniform thickness and flat surface, for example, the thickness can be about 0.2 mm.

[0039] The main function of the upper support layer 41 and the lower support layer 43 is to support and isolate the air bubble cavity in the middle during the subsequent multi-adhesive molding process, preventing the epoxy resin under high temperature and pressure from being injected into the through hole 44, thereby ensuring that the air bubble defect maintains a stable cavity structure after molding. The total thickness formed by the three layers is less than the thickness of the main insulation layer 2 of the stator bar, so as to ensure that the air bubble defect model 4 can be completely embedded inside the main insulation layer 2.

[0040] In some embodiments of this application, the epoxy mica sheet has a smooth surface and uniform thickness to ensure that the bubble defect model 4 does not delaminate when it is wrapped into the main insulation layer 2. The beneficial effect of this technical feature is that it ensures a tight bond between the model and the main insulation layer 2, avoids additional non-target defects caused by delamination, and guarantees the accuracy of the test results.

[0041] S4, determine the embedding position based on the bubble spatial position parameters.

[0042] In one embodiment of this application, as shown in FIG2(a), the true stator bar comprises, from the inside out, conductor strands 1, main insulation layer 2, and semiconductor layer 3. The main insulation layer 2 is formed by wrapping with resin composite mica tape, with 14 to 16 wrapping layers and a total thickness of approximately 3 mm.

[0043] Based on the spatial location parameters of the bubble, the embedding position of the bubble defect model 4 in the main insulation layer 2 of the stator bar is determined. These spatial location parameters include radial and axial position parameters. Radial position setting: In order to compare the characteristics of partial discharge generated by bubble defects at different radial positions, the bubble defect model 4 can be arranged in one of the following radial positions in different stator bars: at the interface between conductor strand 1 and main insulation layer 2 (i.e., the inner side of main insulation layer 2), in the middle region of main insulation layer 2, and at the interface between main insulation layer 2 and semiconductor layer 3 (i.e., the outer side of main insulation layer 2).

[0044] Axial position setting: In order to compare the characteristics of partial discharge generated by bubble defects at different axial positions, bubble defect model 4 can be arranged at multiple different positions along the axial direction of the straight section of the stator bar, such as the position point near the end of the straight section, the intermediate transition position point, and the position point near the middle area of ​​the straight section.

[0045] Only one bubble defect model 4 is set for each stator bar to avoid the superposition of multiple defects affecting the accuracy of the test results.

[0046] In some embodiments of this application, by setting bubble defects at different radial and axial positions in different bars, the influence of position factors on partial discharge characteristics can be systematically studied, providing more comprehensive data support for insulation condition assessment.

[0047] S5, during the wrapping process of the main insulation layer 2 of the stator bar, the bubble defect model 4 is embedded in the embedding position, and the insulation wrapping process is adjusted in the embedding area.

[0048] When the main insulation layer 2 is wrapped to the corresponding layer, the bubble defect model 4 is embedded into the reserved embedding position and made to fit tightly with the existing insulation layer.

[0049] In the region where the bubble defect model 4 is located, the main insulation wrapping process is specifically adjusted. Specifically, the original half-overlap wrapping method is changed to flat wrapping or thinning wrapping method in this region, so that the upper and lower surfaces of the bubble defect model 4 and the adjacent main insulation layer 2 form a smooth transition, reduce the sudden change in local insulation thickness, and avoid electric field distortion caused by the sudden change in thickness, which would affect the accuracy of subsequent partial discharge tests.

[0050] After embedding the bubble defect model 4, continue to wrap the main insulating layer 2 and semiconductor layer 3 in the remaining areas according to the normal process.

[0051] In some embodiments of this application, by adjusting the wrapping process of the embedded area, it is possible to maintain the overall process consistency of the bar while introducing defects, ensuring that the defective sample can represent the insulation state under real operating conditions.

[0052] S6, execute the molding process to obtain a stator bar containing bubble defects constructed according to the bubble defect construction parameters inside the main insulation layer 2, thus completing the simulation of bubble defects in the main insulation of the stator bar.

[0053] The wrapped wire bar is placed into the mold and integrally hot-pressed using a multi-adhesive molding process. During the molding process, the upper support layer 41 and the lower support layer 43 effectively isolate the air bubble cavity, preventing the epoxy resin under high temperature and pressure from entering the through hole 44, thereby ensuring that the air bubble defect still maintains a stable cavity structure after molding.

[0054] After molding, cooling, and demolding, a stator bar sample containing predetermined bubble defects within the main insulation layer 2 is obtained. This sample can be used for subsequent partial discharge tests, defect mechanism studies, and typical defect data collection.

[0055] In the above steps S1 to S6, steps S1 to S4 can be executed in a simulated or planned manner in a computer device, for example, by designing a model and planning the embedding position through CAD software; steps S5 to S6 correspond to the actual production and manufacturing process, but its process parameters (such as temperature, pressure, time) and steps can be controlled or output by the computer device according to a preset program.

[0056] In one embodiment of this application, such as Figure 3 As shown, a system for simulating bubble defects in the main insulation of stator bars is provided, comprising: The parameter acquisition module is used to acquire bubble defect construction parameters, which include at least the bubble lateral dimension parameter, the bubble height parameter, and the bubble spatial position parameter. The model building module is used to select an epoxy mica sheet with a thickness corresponding to the bubble height parameter as the defect setting layer 42 according to the bubble height parameter, and to process through holes 44 in the defect setting layer 42 according to the bubble lateral dimension parameter, and to construct an ABA three-layer clamping structure consisting of an upper support layer 41, a defect setting layer 42 with the through holes 44, and a lower support layer 43 as the bubble defect model 4; The position determination module is used to determine the embedding position of the bubble defect model 4 in the main insulation layer 2 of the stator bar according to the bubble spatial position parameters. The process control module is used to generate a wrapping adjustment scheme and molding process parameters for the main insulation layer of the stator bar based on the bubble defect model 4 and the embedding position. The wrapping adjustment scheme is used to perform insulation wrapping process adjustment in the embedding area.

[0057] Specific limitations regarding the stator bar main insulation bubble defect simulation system can be found in the method limitations section above, and the corresponding technical effects can be obtained equivalently, so they will not be repeated here. Each module in the above system can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0058] Figure 4 An internal structural diagram of a computer device is shown in one embodiment. This computer device may specifically be a terminal or a server. Figure 4 As shown, the computer device includes a processor, memory, network interface, display, camera, and input device connected via a system bus.

[0059] The processor of this computer device provides computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The network interface of the computer device is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements a method for simulating bubble defects in the main insulation of stator bars. The display screen of the computer device can be an LCD screen or an e-ink display screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, a trackball, or a touchpad located on the casing of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0060] As will be understood by those skilled in the art, computer equipment Figure 4 The structure shown is merely a block diagram of a portion of the structure related to the present invention and does not constitute a limitation on the computer device to which the present invention is applied. Specific computing devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0061] In one embodiment, a computer device is provided, 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 steps of the method described above.

[0062] In summary, the stator bar main insulation bubble defect simulation method, system, computer equipment, and medium provided in this application solve the problem of controllably constructing bubble defects inside a real-shaped bar by building a structured ABA three-layer defect model and adopting a construction strategy based on parameter selection of thickness and machining of through holes 44, combined with precise positioning embedding and molding processes. This solution achieves accurate three-dimensional simulation of defect size, shape, and spatial location, providing key experimental means and data foundation for generator insulation condition assessment and partial discharge mechanism research.

[0063] The above-described embodiments are merely preferred embodiments of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various improvements and substitutions without departing from the principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention. Therefore, the scope of protection of this invention should be determined by the scope of the claims.

Claims

1. A method for simulating bubble defects in the main insulation of stator bars, characterized in that, The method for constructing artificial bubble defects with controllable position, size, and shape within the main insulation layer (2) of a true stator bar includes: Obtain bubble defect construction parameters, which include at least bubble lateral dimension parameters, bubble height parameters, and bubble spatial position parameters; Based on the bubble height parameter, an epoxy mica board with a thickness corresponding to the bubble height parameter is selected as the defect setting layer (42), and based on the bubble transverse dimension parameter, through holes (44) are processed in the defect setting layer (42) to form a bubble cavity defined by the through holes (44); A bubble defect model (4) is constructed. The bubble defect model (4) is an ABA three-layer clamping structure, including: a lower support layer (43), a defect setting layer (42) with the through hole (44) and an upper support layer (41). The upper support layer (41) and the lower support layer (43) are both complete epoxy mica sheets without through holes, which are used to seal the upper and lower openings of the bubble cavity in the subsequent molding process. Based on the bubble spatial position parameters, during the wrapping process of the main insulation layer (2) of the stator bar, the bubble defect model (4) is embedded in the embedding position of the main insulation layer (2), and the insulation wrapping process is adjusted in the embedding area; The molding process is performed to stably encapsulate the bubble defect model (4) inside the main insulation layer (2), thereby obtaining a stator bar containing bubble defects constructed according to the bubble defect construction parameters inside the main insulation layer (2), thus completing the simulation of bubble defects in the main insulation of the stator bar.

2. The method for simulating bubble defects in the main insulation of stator bars according to claim 1, characterized in that, The transverse dimension parameters of the bubble include the diameter of the through hole (44) or the equivalent dimension parameters. The geometry of the through hole (44) is selected as one of a circle, an ellipse or a polygon according to the experimental design requirements.

3. The method for simulating bubble defects in the main insulation of stator bars according to claim 1, characterized in that, Based on the bubble height parameter, a defect setting layer (42) with a thickness corresponding to the bubble height parameter is selected, including: while keeping the transverse dimension of the through hole (44) unchanged, adjusting the height of the bubble cavity by changing the thickness of the defect setting layer (42) to achieve graded control of the bubble defect size.

4. The method for simulating bubble defects in the main insulation of stator bars according to claim 1, characterized in that, The bubble spatial position parameters include radial position parameters and axial position parameters; The radial position parameter is used to arrange the bubble defect model (4) at one of the following radial positions: at the interface between the conductor strand (1) and the main insulating layer (2), in the middle region of the main insulating layer (2), or at the interface between the main insulating layer (2) and the semiconductor layer (3). The axial position parameter is used to arrange the bubble defect model (4) at multiple different positions along the axial direction of the straight section of the wire rod.

5. The method for simulating bubble defects in the main insulation of stator bars according to claim 1, characterized in that, The adjustment of the insulation wrapping process for the embedded area includes: in the area where the bubble defect model (4) is located, adjusting the half-overlapping method of the main insulation layer (2) to a flat wrapping or thinning wrapping method to reduce the sudden change in local insulation thickness.

6. The method for simulating bubble defects in the main insulation of stator bars according to claim 1, characterized in that, The total thickness of the upper support layer (41), the defect setting layer (42), and the lower support layer (43) is less than the thickness of the main insulation layer (2) of the stator bar.

7. The method for simulating bubble defects in the main insulation of stator bars according to any one of claims 1 to 6, characterized in that, The epoxy mica board is a complete board with a flat surface, uniform thickness, and no through holes.

8. A system for simulating bubble defects in the main insulation of stator bars, characterized in that, include: The parameter acquisition module is used to acquire bubble defect construction parameters, which include at least bubble lateral dimension parameters, bubble height parameters, and bubble spatial position parameters. The model building module is used to select an epoxy mica sheet with a thickness corresponding to the bubble height parameter as a defect setting layer (42) according to the bubble height parameter, process through holes (44) in the defect setting layer (42) according to the bubble lateral dimension parameter, and construct an ABA three-layer clamping structure consisting of an upper support layer (41), a defect setting layer (42) with the through holes (44) processed and a lower support layer (43) as a bubble defect model (4). The position determination module is used to determine the embedding position of the bubble defect model (4) in the main insulation layer (2) of the stator bar according to the bubble spatial position parameters; The process control module is used to generate a wrapping adjustment scheme and molding process parameters for the main insulation layer of the stator bar based on the bubble defect model (4) and the embedding position. The wrapping adjustment scheme is used to perform insulation wrapping process adjustment in the embedding area.

9. A computer device, characterized in that, include: Processor and computer-readable storage media; A processor, adapted to execute computer programs; A computer-readable storage medium storing a computer program that, when executed by the processor, implements the method for simulating bubble defects in the main insulation of stator bars as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program adapted to be loaded by a processor and executed as described in any one of claims 1 to 7, the method for simulating bubble defects in the main insulation of stator bars.

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