Generator stator core simulator equipment and method for simulating short circuit between laminations

Abstract

The invention provides a generator stator core simulator device and an inter-lamination short circuit simulation method, and relates to the technical field of generators. The short-circuit fault simulation device solves the problem that the existing short-circuit fault simulation device interferes with test data and affects the test accuracy due to the fact that a lead is arranged in a stator core. The stator comprises a pair of non-magnetic steel plates, a pair of insulating sheets, a plurality of positioning ribs and a stator core, the two axial ends of the stator core are connected with the insulating sheets, the sides, away from the stator core, of the insulating sheets are connected with the non-magnetic steel plates, and the positioning ribs are evenly distributed on the periphery of the stator core. The stator core comprises silicon steel rings and annular silicon steel sheets II which are axially and alternately stacked; the silicon steel ring is formed by stacking m annular silicon steel sheets I which are insulated from one another and have completely aligned axial contours; the lugs are detachably connected with an external wire. Resistance wires are embedded in the inner wall of the stator core and are electrically connected with the adjacent second annular silicon steel sheets. The device is mainly used for stator core short circuit simulation.

Description

Technical Field

[0001] This invention relates to the field of generator technology, and in particular to a generator stator core simulator device and a method for simulating short circuits between laminations. Background Technology

[0002] With the continuous expansion of power systems, the safe operation of large generators, as core equipment of the power grid, is of paramount importance, and the health of their stator cores directly affects the safe and stable operation of the power grid. As the core magnetic circuit component of the motor, the structural design of the stator core has a decisive impact on the motor's performance and efficiency. The core is primarily assembled from components such as fan-shaped silicon steel sheets, positioning ribs, toothed pressure plates, tension bolts, and ventilation slots. The fan-shaped silicon steel sheets are made of high-permeability material, stamped and stacked into a ring structure with a thickness strictly controlled between 0.35 and 0.5 mm. An insulating layer is applied to the surface to effectively suppress eddy current losses and significantly improve motor efficiency. Positioning ribs are welded to the base ring plate via support plates, providing a precise positioning reference for the stacked silicon steel sheets and ensuring the stability and concentricity of the core during assembly. The toothed pressure plates and tension bolts symmetrically tighten the core into a unified structure, enhancing its mechanical strength and ensuring its vibration resistance during operation. Ventilation slots are staggered between the stacked sections, forming axial ventilation channels that guide the flow of cooling medium for efficient heat dissipation. This design is particularly crucial in large motors, effectively preventing overheating and ensuring long-term stable operation. These components work synergistically to construct an efficient and stable motor magnetic circuit system, providing a solid foundation for the high-performance operation of the motor.

[0003] Stator core lamination short-circuit faults are a typical hidden danger in generators, potentially leading to localized overheating, efficiency loss, and even equipment damage, thus affecting the reliability of the entire power supply. However, the detection and diagnosis of stator core lamination short-circuit faults have long faced multiple challenges, such as a scarcity of real fault samples, limited opportunities for on-site testing, and difficulties in training professional personnel. These challenges not only involve technical aspects but also operational procedures and the industry ecosystem, severely restricting the improvement of industry technical levels and the optimization of equipment maintenance efficiency. For example, in actual operation, such faults are often difficult to detect in a timely manner, increasing the risk of sudden shutdowns and thus affecting the overall stability of the power system. As the main power generation equipment, large generators need to maintain continuous operation to ensure grid load demand, which results in extremely limited detection windows. Planned shutdown maintenance cycles are usually long, possibly lasting months or even years. Opportunities for on-site contact with the stator core are extremely limited, making fault diagnosis difficult to routine. Fault sample data detection opportunities are few, and collection is difficult, leading to insufficient accumulation of actual fault cases and difficulty in establishing a complete fault characteristic database. This further hinders the development of data-based intelligent diagnostic technology. The fault current generated by inter-laminated short-circuit faults under excitation conditions is not directly measurable because the short-circuit current is often masked by the main magnetic field, requiring indirect methods such as eddy current analysis for inference. The fault manifestations are hidden, and early warning signals are weak, such as only manifesting as slight temperature rise or electromagnetic noise, which are easily ignored, increasing the difficulty of preventive maintenance. The fault development law is complex and affected by multiple factors such as material aging and mechanical stress, making it difficult to establish accurate mathematical models. This limits the implementation and optimization of predictive maintenance strategies.

[0004] Existing short-circuit fault simulation devices have the following shortcomings: 1. Wires inside the stator core will damage the integrity of the internal silicon steel sheets, and the short circuit location can be seen from the inside. The internal space is small, making it impossible to perform multiple short circuits on the same set of silicon steel sheets. When conducting iron loss or ELCID tests, it will interfere with the test data, thereby affecting the accuracy of the test.

[0005] 2. The positioning ribs are welded to the silicon steel sheets on the outside, which will cause the resistance of the positioning ribs to be higher than that of the short circuit point. The heat will be concentrated on the external positioning ribs, affecting the internal short circuit heating point.

[0006] 3. The connection points are located in a narrow space inside the iron core, making wiring inconvenient and hindering future disassembly and maintenance.

[0007] Therefore, the industry urgently needs to establish a standardized experimental research platform to provide technical support for equipment development, personnel training, and skills assessment. Summary of the Invention

[0008] The purpose of this invention is to provide a generator stator core simulator device and a method for simulating short circuits between laminations, which helps the industry establish a standardized experimental research platform and provides technical support for the development and calibration of testing equipment, research on testing technologies, personnel training and skills evaluation, and skills competitions.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a generator stator core simulator device, comprising a pair of non-magnetic steel plates, a pair of insulating sheets, multiple positioning ribs, and a stator core. The stator core is cylindrical, with both ends of the stator core axially connected to the insulating sheets. The side of the insulating sheets away from the stator core is connected to the non-magnetic steel plates. Both the non-magnetic steel plates and the insulating sheets are provided with through holes coaxial with the stator core. The positioning ribs are evenly distributed on the outer periphery of the stator core, with both ends of the positioning ribs perpendicularly connected to the non-magnetic steel plates. An insulating layer is provided between the positioning ribs and the stator core. The stator core comprises axially alternating stacked silicon steel rings and annular silicon steel sheets. The silicon steel ring is formed by stacking m mutually insulated annular silicon steel sheets with perfectly aligned axial contours. The first and second annular silicon steel sheets are insulated from each other and their inner contours are completely aligned in the axial direction. The lugs are detachably connected to the external wires. Resistance wires are embedded axially in the inner wall of the stator core, and the resistance wires are electrically connected to the adjacent annular silicon steel sheets.

[0010] Furthermore, the ear piece has a notch, through which it can be detachably connected to an external wire.

[0011] Furthermore, the annular silicon steel sheet one and the annular silicon steel sheet two are exactly the same in shape, and ear pieces also extend from the outer periphery. The outer contour of the annular silicon steel sheet one and the outer contour of the annular silicon steel sheet two are offset by 180° in the axial direction.

[0012] Furthermore, there are four ear pieces in total, symmetrical in pairs, and all four ear pieces are located within the same half circumference of the annular silicon steel sheet II. There are two notches, which are U-shaped.

[0013] Furthermore, the inner contours of the first and second annular silicon steel sheets are both toothed, forming an internal tooth structure on the inner wall of the stator core. The resistance wire comprises multiple segments, which are arranged sequentially along the axial direction of the stator core, respectively along the tooth top, tooth middle, or tooth bottom embedded in the internal tooth structure.

[0014] Furthermore, the stator core is also axially interspersed with multiple annular radial ventilation grooves.

[0015] Furthermore, the inner wall of the stator core is coated with a layer of paint.

[0016] Furthermore, m can be any integer between 20 and 50.

[0017] Furthermore, both the insulating sheet and the insulating layer are made of epoxy resin, and the resistance wire is made of nickel-chromium wire.

[0018] A method for simulating short circuits between laminations of a generator stator core, using the aforementioned generator stator core simulator device, specifically includes the following steps: S1. Grind the surface of all the ear pieces of the second ring-shaped silicon steel sheet, remove the insulating coating, and then connect the ear pieces to the circuit experiment control box through wires. This allows the circuit experiment control box to control the on / off connection between the circuit experiment control box and all the second ring-shaped silicon steel sheets. S2. Pass a current-carrying wire through the through hole in the non-magnetic steel plate and the insulating sheet, and place it on the axis of the stator core as the excitation wire. S3. Operate the circuit experiment control box to electrically connect the circuit experiment control box with multiple pairs of annular silicon steel sheets, forming multiple closed loops composed of the circuit experiment control box, a pair of annular silicon steel sheets, and resistance wires. The closed loops generate current under the action of the excitation wires to simulate the short circuit of the generator stator core.

[0019] Compared with the prior art, the beneficial effects of the generator stator core simulator device and inter-laminated short-circuit simulation method described in this invention are: 1. This invention designs a second annular silicon steel sheet with lugs. The second annular silicon steel sheet is used intermittently during the process of assembling the stator core using silicon steel sheets, enabling wiring conditions on the outer wall of the assembled stator core. Resistance wires are embedded axially on the inner wall of the stator core. After grinding the lugs of the second annular silicon steel sheet and removing the insulating coating, any pair of second annular silicon steel sheets can be electrically connected through the notch, forming a closed circuit composed of the resistance wires of a pair of second annular silicon steel sheets. This simulates a short circuit in the generator stator core, solving the problems of existing short-circuit fault simulation devices lacking external wiring conditions, requiring wiring to be led from inside the stator core, the limited internal space of the stator core, inconvenient operation, and interference with test data from internal wiring, thus affecting the accuracy of the test.

[0020] 2. The resistance wire described in this invention is divided into multiple segments along the axial direction, and is respectively along the tooth top, tooth middle or tooth bottom of the tooth structure embedded in the inner wall of the stator core. By using different annular silicon steel sheets and resistance wires at different positions to form closed circuits, short circuit simulation of silicon steel sheets at different positions and with different thicknesses on the inner wall of the stator core can be realized.

[0021] 3. The present invention has an insulating layer between the positioning rib and the stator core. During simulation, multiple pairs of annular silicon steel sheets can be electrically connected at the same time to form multiple closed loops composed of resistance wires of a pair of annular silicon steel sheets. This enables simultaneous simulation of short circuits at multiple locations of the generator stator core, solving the problem that existing short circuit fault simulation devices rely on positioning ribs to form closed loops, and the positioning ribs are in direct contact with all silicon steel sheets and electrically connected to each other, thus making it impossible to simulate multiple short circuits on the same set of silicon steel sheets.

[0022] 4. This invention involves cutting and welding high-resistance nickel-chromium wires as resistance wires at the tooth tops, tooth bottoms, and tooth centers on the inner wall of the stator core. The resistance of the internal welding points is greater than that of the external wires, making it easier to observe the damaged parts of the core using thermal imaging during iron loss tests. After the wires are embedded, the welding points are ground and a paint layer is sprayed onto the inner wall of the stator core, making the embedded location invisible from the outside. This is similar to the characteristic that short-circuit locations in the stator core are difficult to visually detect in reality, requiring personnel to measure the short-circuit location using instruments based on the principle. This avoids the situation where personnel directly judge the short-circuit location based on visual differences, thus losing the simulation significance. This invention can select the number of short-circuit silicon steel sheets by connecting them to different annular silicon steel sheets, realizing the simulation of short-circuit conditions of silicon steel sheets of different thicknesses at the same location (such as the tooth top).

[0023] 5. This invention can use the same tool to manufacture annular silicon steel sheets 1 and 2 with exactly the same shape, reducing mold costs. The annular silicon steel sheets 1 and 2 are stacked 180° apart, so that the ear positions of the annular silicon steel sheets 1 and 2 are staggered. The m consecutively stacked annular silicon steel sheets 1 form a gap between a pair of adjacent annular silicon steel sheets 2, so that the ear positions of the annular silicon steel sheets 2 have space for wiring.

[0024] 6. The generator stator core simulator and inter-laminated short-circuit simulation method described in this invention can be used for the study of inter-laminated short-circuit fault patterns in stator cores and the development of detection equipment, serving as a standard platform for the development and calibration of detection equipment. This invention, through a fully simulated device that highly replicates real-world operating conditions (such as stator iron loss tests and ELCID tests), allows operators to conduct repeated and systematic skill practice while ensuring safety. This immersive training mode effectively overcomes the bottleneck of scarce on-site opportunities, significantly improves operational standardization and proficiency, and effectively shortens the talent training cycle. Attached Figure Description

[0025] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1This is a schematic diagram of the structure of a generator stator core simulator device according to the present invention; Figure 2 For the present invention Figure 1 A magnified view of a section at point A in the middle; Figure 3 For the present invention Figure 1 A magnified view of a section at point B in the middle; Figure 4 This is a front view of the annular silicon steel sheet II described in this invention; Figure 5 For the present invention Figure 4 A magnified view of a section at point C; Figure 6 This is a schematic diagram of the non-magnetic steel plate and positioning ribs described in this invention; Figure 7 This is an exploded view of the stator core described in this invention; Figure 8 This is a front view of the stator core when the annular silicon steel sheet one and the annular silicon steel sheet two have exactly the same shape as described in this invention; Figure 9 This is a schematic diagram of the structure of the silicon steel rings and annular silicon steel sheets stacked alternately along the axis as described in this invention; Figure 10 This is a schematic diagram of the structure of the resistance wire embedded in the tooth tip of the internal tooth structure according to the present invention; Figure 11 This is a schematic diagram of the structure of the resistance wire of the present invention embedded in the teeth of the internal tooth structure; Figure 12 This is a schematic diagram of the structure of the resistance wire embedded in the tooth bottom of the internal tooth structure according to the present invention; Figure 13 This is a schematic diagram of the structure used in simulating short circuits between stator core laminations using a generator stator core simulator device described in this invention. In the diagram: 1-Non-magnetic steel plate; 2-Insulating sheet; 3-Positioning rib; 4-Stator core; 5-Insulation layer; 6-Annular silicon steel sheet one; 7-Annular silicon steel sheet two; 8-Resistance wire; 9-Annular radial ventilation groove layer; 71-ear plate; 711-notch, m is the number of continuously stacked annular silicon steel sheets. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other, and the described embodiments are only some embodiments of the present invention, not all embodiments.

[0027] I. Detailed Implementation Method 1, see [link / reference] Figure 1-13This embodiment describes a generator stator core simulator device, comprising a pair of non-magnetic steel plates 1, a pair of insulating sheets 2, multiple positioning ribs 3, and a stator core 4. The stator core 4 is cylindrical, with both ends of the stator core 4 connected to the insulating sheets 2 axially. The side of the insulating sheets 2 away from the stator core 4 is connected to the non-magnetic steel plates 1. Both the non-magnetic steel plates 1 and the insulating sheets 2 have through holes coaxial with the stator core 4. The shape of the through holes is the same as the inner contour shape of the annular silicon steel sheet 6, and they are completely aligned axially. The through holes are used to arrange excitation wires. The positioning ribs 3 are evenly distributed on the outer periphery of the stator core 4, with both ends of the positioning ribs 3 perpendicularly connected to the non-magnetic steel plates 1. An insulating layer 5 is provided between the positioning ribs 3 and the stator core 4. The bottom of the pair of non-magnetic steel plates 1 is perpendicularly connected to a pair of parallel steel plates, serving as planar supports to facilitate horizontal placement of the device. The stator core 4 includes axially alternating stacked silicon steel rings and annular silicon steel sheets 7, the outlines of all the annular silicon steel sheets 7 being completely aligned in the axial direction. See attached document Figure 9 The silicon steel ring is formed by stacking m mutually insulated annular silicon steel sheets 6 with perfectly aligned axial contours; the annular silicon steel sheets 6 and 7 are mutually insulated and their inner contours are perfectly aligned axially; the annular silicon steel sheets 7 have lugs 71 extending outward from their outer periphery, and the lugs 71 are detachably connected to external wires, allowing operators to lay wires; the annular silicon steel sheets 6 and 7 have identical circular shapes, the difference being that the annular silicon steel sheets 7 also have lugs 71 extending outward from their circular shape; m is any integer from 20 to 50; A resistance wire 8 is embedded axially in the inner wall of the stator core, and the resistance wire 8 is electrically connected to the adjacent annular silicon steel sheet 7.

[0028] The electrical connection refers to the physical connection between components to establish a path that allows current to flow.

[0029] The ear piece 71 has a notch 711, and the ear piece 71 is detachably connected to an external wire through the notch 711.

[0030] The surfaces of the annular silicon steel sheet 6 and the annular silicon steel sheet 7 are coated with an insulating coating. The insulating coating is made of phosphate-based coating or chromate-containing epoxy resin coating, and the thickness of each coating is 0.35mm-0.5mm.

[0031] The annular silicon steel sheet 6 and the annular silicon steel sheet 7 are exactly the same in shape, and the outer periphery is also extended with ear pieces. The outer contour of the annular silicon steel sheet 6 and the outer contour of the annular silicon steel sheet 7 are offset by 180° in the axial direction.

[0032] Preferably, there are four ear pieces 71 in total, symmetrical in pairs, and all four ear pieces 71 are located within the same half circumference of the annular silicon steel sheet 7. There are two notches 711, which are U-shaped.

[0033] See attached document Figure 10-12 The inner contours of the annular silicon steel sheet 6 and the annular silicon steel sheet 7 are both internally toothed, so that the inner wall of the stator core 4 forms an internal tooth structure. The resistance wire 8 includes multiple segments, which are arranged sequentially along the axial direction of the stator core 4, respectively along the tooth top, tooth middle or tooth bottom embedded in the internal tooth structure.

[0034] The resistance wire 8 is fixed by welding after axially slotting the inner wall of the stator core 4. Putty is applied to the defective areas to level the slots, creating a smooth surface indistinguishable from the original. Putty is a basic material used in building decoration engineering for repairing and leveling walls and ceilings. It is a layer of material applied to the base surface before painting or coating. Its main components are usually a mixture of binders (such as cement, gypsum, polymers), fillers (such as calcium carbonate, talc), and additives (such as water-retaining agents and thickeners). When used, it is mixed with water to form a paste for leveling.

[0035] The inner wall of the stator core 4 is coated with a layer of paint, so the location of the resistance wire 8 cannot be seen from the outside. This is similar to the characteristic that the short circuit location of the stator core is difficult to find intuitively in reality. Personnel are required to use instruments to measure the short circuit location according to the principle, so as to avoid personnel directly judging the short circuit location from the difference in appearance with the naked eye, which would defeat the purpose of simulation.

[0036] The stator core 4 is also interspersed with multiple annular radial ventilation slot layers 9. The annular radial ventilation slot layers 9 are evenly distributed along the axial direction of the stator core 4. Their function is to provide a low-resistance radial flow path for air, so that air can penetrate the lamination area of ​​the core radially and directly cool the core, thereby greatly enhancing the heat dissipation efficiency. Setting the annular radial ventilation slot layers 9 can more accurately reflect the actual structure of the generator stator core.

[0037] The annular radial ventilation groove layer 9 is a ventilation groove plate, made of insulating material (such as epoxy glass cloth board, laminated wood board) or non-magnetic metal pads (small I-shaped or rectangular).

[0038] Preferably, m is 20, and after stacking 20 annular silicon steel sheets, one annular silicon steel sheet is flipped 180° and stacked.

[0039] Both the insulating sheet 2 and the insulating layer 5 are made of epoxy resin, and the resistance wire 8 is a nickel-chromium wire. The nickel-chromium wire has a high resistance, which makes the resistance of the internal welding point of the embedded resistance wire 8 greater than the resistance of the external wire. Therefore, in the iron loss test, it is easier to observe the damaged part of the iron core using thermal imaging.

[0040] A method for simulating short circuits between laminations of a generator stator core, using the aforementioned generator stator core simulator device, specifically includes the following steps: S1. Grind the surface of the ear piece 71 of all the annular silicon steel sheets 7, remove the insulating coating, and then connect the ear piece 71 to the circuit experiment control box through the wire. This allows the circuit experiment control box to control the on / off connection between the circuit experiment control box and all the annular silicon steel sheets 7. S2. Pass a current-carrying wire through the through hole of the non-magnetic steel plate 1 and the insulating sheet 2, and place it at the axial position of the stator core 4 as the excitation wire. S3. Operate the circuit experiment control box to electrically connect the circuit experiment control box with multiple pairs of annular silicon steel sheets 7, forming multiple closed loops composed of the circuit experiment control box, a pair of annular silicon steel sheets 7, and resistance wire 8. The closed loop generates current under the action of the excitation wire to simulate the short circuit of the generator stator core.

[0041] The energized wires are directly connected to the two output terminals of the autotransformer, which can adjust the voltage output to control the magnitude of the short-circuit current in the stator core 4.

[0042] The circuit experiment control box contains current transformers, circuit breakers, and other devices. The circuit experiment control box is equipped with a display screen that can show the short-circuit position and short-circuit current of the iron core.

[0043] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A generator stator core simulator device, characterized in that, It includes a pair of non-magnetic steel plates (1), a pair of insulating sheets (2), multiple positioning ribs (3) and a stator core (4). The stator core (4) is cylindrical. The two ends of the stator core (4) are connected to the insulating sheets (2) in the axial direction. The side of the insulating sheet (2) away from the stator core (4) is connected to the non-magnetic steel plate (1). Both the non-magnetic steel plate (1) and the insulating sheet (2) are provided with through holes coaxial with the stator core (4). The positioning ribs (3) are evenly distributed on the outer periphery of the stator core (4). Both ends of the positioning ribs (3) are perpendicularly connected to the non-magnetic steel plate (1). An insulating layer (5) is provided between the positioning ribs (3) and the stator core (4). The stator core (4) comprises axially alternating stacked silicon steel rings and annular silicon steel sheets (7); The silicon steel ring is formed by stacking m mutually insulated and axially aligned annular silicon steel sheets (6); The annular silicon steel sheet one (6) and the annular silicon steel sheet two (7) are insulated from each other and their inner contours are completely aligned in the axial direction. The annular silicon steel sheet two (7) has an ear piece two (71) extending outward from its outer periphery. The ear piece (71) is detachably connected to the external wire. A resistance wire (8) is embedded axially in the inner wall of the stator core, and the resistance wire (8) is electrically connected to the adjacent annular silicon steel sheet (7).

2. The generator stator core simulator device according to claim 1, characterized in that, The ear piece (71) has a notch (711) and the ear piece (71) is detachably connected to the external wire through the notch (711).

3. The generator stator core simulator device according to claim 2, characterized in that, The annular silicon steel sheet one (6) and the annular silicon steel sheet two (7) have the same shape, and the outer contour of the annular silicon steel sheet one and the outer contour of the annular silicon steel sheet two are offset by 180° in the axial direction.

4. The generator stator core simulator device according to claim 2, characterized in that, There are four ear pieces (71) in total, symmetrical in pairs. All four ear pieces (71) are located within the same half circumference of the annular silicon steel sheet (7). There are two notches (711) in U shape.

5. The generator stator core simulator device according to claim 1, characterized in that, The inner contours of the first annular silicon steel sheet (6) and the second annular silicon steel sheet (7) are both toothed, so that the inner wall of the stator core (4) forms an internal tooth structure. The resistance wire (8) includes multiple segments, and the multiple resistance wires (8) are arranged sequentially along the axial direction of the stator core (4), respectively along the tooth top, tooth middle or tooth bottom embedded in the internal tooth structure.

6. The generator stator core simulator device according to claim 1, characterized in that, The inner wall of the stator core (4) is coated with a layer of paint.

7. The generator stator core simulator device according to claim 1, characterized in that, The stator core (4) is also axially interspersed with multiple annular radial ventilation slots (9).

8. The generator stator core simulator device according to claim 1, characterized in that, m is any integer between 20 and 50.

9. A generator stator core simulator device according to claim 1, characterized in that, The insulating sheet (2) and the insulating layer (5) are both made of epoxy resin, and the resistance wire (8) is made of nickel-chromium wire.

10. A method for simulating short-circuit laminations in a generator stator core, characterized in that, Using the generator stator core simulator device as described in any one of claims 1-9 specifically includes the following steps: S1. Grind the surface of the ear piece (71) of all the annular silicon steel sheets (7), remove the insulating coating, and then connect the ear piece (71) to the circuit experiment control box through the wire. S2. Pass a current-carrying wire through the through hole of the non-magnetic steel plate (1) and the insulating sheet (2), and place it on the axis of the stator core (4) as the excitation wire. S3. Operate the circuit experiment control box to electrically connect the circuit experiment control box with multiple pairs of annular silicon steel sheets (7) to form multiple closed loops composed of the circuit experiment control box, a pair of annular silicon steel sheets (7) and resistance wire (8). The closed loop generates current under the action of the excitation wire to complete the simulation of short circuit of generator stator core.

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