Power transformer winding fault simulation device, diagnosis system and diagnosis method

Abstract

The invention provides a power transformer winding fault simulation device, a diagnosis system and a diagnosis method. The device comprises a rack; the winding is rotationally connected with the rack; the locking mechanism is used for locking the winding and comprises a first transmission device and a first driving motor which are arranged on the rack; the first driving motor drives the first transmission device to rotate so as to unlock the winding; the fault simulation mechanism comprises a second driving motor and an extrusion device; the second driving motor drives the winding to move in the direction away from or close to the rack in the axis direction. The extrusion device is arranged on the periphery of the winding, points to the winding and is used for generating fault points on the surface of the winding. By arranging the rack and the locking mechanism, the first driving motor drives the first transmission device to rotate, accurate adjustment and fixation of the winding position are achieved, and the accuracy of fault simulation is improved; a second driving motor in the fault simulation mechanism can drive the winding to move in the axis direction, and simulation of the axial displacement fault of the winding is achieved.

Description

Technical Field

[0001] The present invention relates to the field of power transformers, and particularly to a power transformer winding fault simulation device, a diagnosis system and a diagnosis method. Background Art

[0002] UHV transformers are key equipment for the safe and stable operation of the power grid. The winding deformation faults of UHV transformers may lead to the deterioration of equipment performance and even cause serious accidents. At present, the winding deformation fault diagnosis method based on vibration signals mainly analyzes the self-excited vibration signals generated during the operation of the transformer body. However, due to the complexity and uncertainty of the vibration source, it is difficult to accurately identify the fault type.

[0003] The existing winding fault diagnosis methods mainly include frequency response analysis (FRA), short-circuit impedance method and vibration method, etc. Among them, the FRA method requires the transformer to be out of service for testing, which affects the operation of the power grid; the short-circuit impedance method can only detect the overall deformation of the winding and is difficult to identify local deformation; while the traditional vibration method relies on the self-excited vibration signals during the operation of the transformer and is greatly affected by the external environment and load conditions, and the accuracy and reliability of the diagnosis results are relatively low. Therefore, there is an urgent need for a method that can actively excite the vibration of the transformer winding and accurately diagnose the fault type. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that it is difficult to accurately identify the fault type according to the self-excited vibration signals in fault detection.

[0005] In the first aspect of the present invention, a power transformer winding fault simulation device is provided, including:

[0006] A frame;

[0007] A winding, which is rotatably connected to the frame;

[0008] A locking mechanism for locking the winding, including a first transmission device and a first driving motor arranged on the frame; the first driving motor drives the first transmission device to rotate to unlock the winding;

[0009] A fault simulation mechanism, including a second driving motor and an extrusion device; the second driving motor drives the winding to move away from or close to the frame along the axial direction; the extrusion device is placed on the outer periphery of the winding and points to the winding for generating a fault point on the surface of the winding.

[0010] Further, the frame includes a support frame and a support platform vertically fixed on the support frame.

[0011] Further, the first transmission device is a gear, the gear is movably connected to the support platform through a fixing gasket, and the output shaft of the first driving motor is mechanically connected to the central shaft of the gear.

[0012] Further, one end of the winding close to the support platform is rotatably connected to the support platform through a connecting rod; the second driving motor is fixed on the support platform, and the output shaft is mechanically connected to the connecting rod.

[0013] Further, the fault simulation system further includes a connecting frame, the connecting frame is arranged around the winding and has a preset distance from the winding, and the extrusion device is fixed on the inner ring of the connecting frame.

[0014] Further, at least one extrusion device is provided, and the extrusion devices are evenly arranged on the inner ring of the support frame.

[0015] Further, the extrusion device includes:

[0016] A guiding ring, clamped on the inner ring of the connecting frame;

[0017] An extrusion plug, placed inside the guiding ring and slidably connected to the guiding ring, and the extrusion plug reciprocates radially in the guiding ring;

[0018] An extrusion head, fixed to one end of the extrusion plug close to the winding.

[0019] Further, the extrusion device further includes:

[0020] A left spray head and a right spray head, symmetrically arranged on both sides of the extrusion head;

[0021] And a cooling channel inlet, arranged on the guiding ring.

[0022] In a second aspect of the present invention, there is provided a power transformer winding fault simulation diagnosis system, including:

[0023] A high-frequency high-voltage control device, connected to a high-voltage switch and a DC source;

[0024] A plurality of power transformer winding fault simulation devices as described in any one of the above, and the windings in the power transformer winding fault simulation devices are respectively led out to the high-frequency high-voltage control device through bushings;

[0025] A signal acquisition device, which acquires and analyzes the structural vibration signals of the power transformer winding fault simulation device.

[0026] Among them, the high-frequency high-voltage switch is used to perform periodic actions to stimulate the power transformer winding fault simulation device to generate structural vibrations.

[0027] In a third aspect of the present invention, there is provided a method for simulating and diagnosing power transformer winding faults, using the transformer winding fault diagnosis system as described above, including:

[0028] Fix the winding;

[0029] Adjust the spatial position of the winding;

[0030] Drive the extrusion device to move to the winding and apply an extrusion force to the winding;

[0031] Stimulate the vibration of the winding;

[0032] Collect and analyze the vibration signal for fault diagnosis.

[0033] Further, in adjusting the spatial position of the winding, the first driving motor controls the first transmission device to rotate to unlock the winding; the second driving motor controls the winding to move axially to a preset position.

[0034] Further, multiple extrusion devices move simultaneously or sequentially.

[0035] Further, obtain the vibration response characteristics of the winding according to the vibration signal, and judge the fault level of the winding according to the comparison between the characteristics and the threshold.

[0036] Compared with the prior art, the present invention at least includes the following beneficial effects: By setting up the frame and the locking mechanism, the first driving motor can drive the first transmission device to rotate, realizing precise adjustment and fixation of the winding position, improving the accuracy of fault simulation; Through the second driving motor in the fault simulation mechanism, the winding can be driven to move along the axial direction, realizing the simulation of the axial displacement fault of the winding; At the same time, the extrusion device can apply a radial pressure to the winding to simulate the radial deformation fault of the winding. This device can flexibly simulate various types of winding faults and provides a reliable experimental platform for fault diagnosis research. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained as provided.

[0038] Figure 1 It is a schematic diagram of the overall structure of the transformer winding fault simulation device in an embodiment of the present invention;

[0039] Figure 2 Is an axonometric view of the transformer winding fault simulation device in an embodiment of the present invention;

[0040] Figure 3 Is a top view of the transformer winding fault simulation device in an embodiment of the present invention;

[0041] Figure 4 Is a partial enlarged view of the transformer winding fault simulation device in an embodiment of the present invention;

[0042] Figure 5 Is a structural schematic diagram of the extrusion device in the transformer winding fault simulation device in an embodiment of the present invention;

[0043] Figure 6 Is a schematic diagram of the power transformer winding fault simulation and diagnosis system in an embodiment of the present invention;

[0044] Figure 7 Is a flowchart of the transformer winding fault simulation and diagnosis method in an embodiment of the present invention;

[0045] Figure 8 Is a specific flowchart of the transformer winding fault simulation and diagnosis method in an embodiment of the present invention.

[0046] Among them, 1 - winding; 2 - support platform; 3 - fixing piece; 4 - first transmission device; 5 - first connecting frame; 6 - external power supply terminal; 7 - support shaft; 10 - first driving motor; 12 - second connecting frame; 14 - support base; 15 - second driving motor; 16 - fixing frame; 17 - rotating lead screw; 19 - bottom plate seat; 21 - rotation sensor; 23 - clamping sensor; 26 - support frame; 27 - fixing screw; 28 - rotating gear support platform; 29 - connecting rod; 30 - rotating internal gear; 31 - rotating planetary gear; 32 - fixing gasket; 33 - extrusion device; 36 - buckle; 37 - extrusion plug; 38 - guide ring; 39 - cooling channel; 40 - left spray head; 41 - extrusion head; 42 - right spray head; 44 - first sleeve; 45 - second sleeve; 46 - third sleeve; 47 - fourth sleeve; 48 - fifth sleeve; 49 - sixth sleeve; 50 - high-frequency high-voltage switch; 51 - high-frequency high-voltage DC power supply; 52 - high-speed camera; 53 - signal acquisition device; 54 - first winding; 55 - second winding; 56 - third winding; 57 - fourth winding; 58 - fifth winding; 59 - sixth winding. Detailed implementation manners

[0047] The present invention will be described in more detail below in conjunction with the schematic diagrams, which show the preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being widely known to those skilled in the art and not as a limitation on the present invention.

[0048] It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0049] In the following paragraphs, the present invention will be described more specifically by way of example with reference to the accompanying drawings. As will be described below, the advantages and features of the present invention will be more apparent. It should be noted that the drawings are in a very simplified form and are drawn using non-precise scales, solely for the purpose of facilitating and clearly assisting in the explanation of the objectives of the embodiments of the present invention.

[0050] Embodiment 1

[0051] This embodiment provides a power transformer winding fault simulation device. Please refer to Figures 1-5 , including:

[0052] A frame;

[0053] A winding 1, wherein the winding 1 is rotatably connected to the frame;

[0054] A locking mechanism for locking the winding 1, including a first transmission device 4 and a first driving motor 10 provided on the frame; the first driving motor 10 drives the first transmission device 4 to rotate to unlock the winding 1;

[0055] A fault simulation mechanism, including a second driving motor 15 and an extrusion device 33; the second driving motor 15 drives the winding 1 to move away from or close to the frame in the axial direction; the extrusion device 33 is placed on the outer periphery of the winding 1 and points to the winding 1 for generating a fault point on the surface of the winding 1.

[0056] Specifically, as the overall support structure, the frame drives the first transmission device 4 to rotate through the first drive motor 10 in the locking mechanism, realizing the precise positioning and locking of the position of the winding 1. During the fault simulation process, the second drive motor 15 can drive the winding 1 to reciprocate along its axial direction to simulate the axial displacement fault of the winding 1. At the same time, the extrusion device 33 is controlled to apply radial pressure to the winding 1, and different types of radial deformation faults of the winding 1 are simulated by adjusting the pressure magnitude and acting position, so as to realize the simulation and research of various fault states of the transformer winding 1.

[0057] Further, please refer to Figure 1 , the frame includes a support base 14 and a support platform 2 vertically fixed on the support base 14.

[0058] Further, the first transmission device 4 is a gear, and the gear is movably connected to the support platform 2 through a fixing gasket 32, and the output shaft of the first drive motor 10 is mechanically connected to the first transmission device 4.

[0059] Specifically, the frame adopts a combined structure of a support frame 26 and a vertically fixed support platform 2, enhancing the stability of the overall structure.

[0060] In this embodiment, the first transmission device 4 adopts a gear structure and forms a movable connection with the support platform 2 through a fixing gasket 32. A fixing member 3 is provided on the support platform 2, and the gear is arranged parallel to the front and back of the support platform 2 and is detachably connected through the fixing member 3 and the fixing gasket 32. The output shaft of the first drive motor 10 is mechanically connected to the first transmission device 4 of the gear, ensuring the reliability and efficiency of power transmission, so that the entire locking mechanism can more precisely control the position and attitude of the winding 1. In this embodiment, a transmission chain (not shown in the figure) is provided between the first drive motor 10 and the first transmission device 4, and through this transmission chain, the first transmission device 4 can be driven to rotate.

[0061] In this embodiment, the locking mechanism further includes a detection component, and the detection component includes a rotating gear support platform 28 and a clamping sensor 23. Please refer to Figure 1 and Figure 3 , the rotating gear support platform 28 is fixed to the support frame 26 through a fixing screw 27. The detection component is used to detect the current position or rotation angle of the gear. When the first drive motor 10 runs, it drives the first transmission device 4 placed thereon. At this time, the first transmission device 4 is far from the winding 1, and the position of the winding 1 is unlocked; when the first drive motor 10 runs in the reverse direction, the first transmission device 4 approaches the winding 1, and the position of the winding 1 is locked. When the clamping sensor 23 detects that the first transmission device 4 rotates to a preset angle, the first drive motor 10 stops running.

[0062] Further, please refer toFigure 2 The support shaft 7 of the winding 1 is rotatably connected to the support platform 2; the second driving motor 15 is fixed on the support platform 2, and the output shaft is mechanically connected to the connecting rod 29.

[0063] The second driving motor 15 is used to drive the winding 1 to move in the axial direction to simulate faults at different positions. Specifically, a fixing frame 16 is provided on the support platform 2, and the support shaft 7 of the winding 1 is connected to the rotating lead screw 17 through the connecting rod 29. When the second driving motor 15 operates, it drives the rotating lead screw 17 and the connecting rod 29 to rotate, that is, drives the winding 1 to rotate to achieve axial adjustment. In this embodiment, a rotation sensor 21 is provided on the support platform 2, and the rotation sensor 21 also detects the distance of the winding 1 in the axial direction to control the start and stop of the second driving motor 15. Please refer to Figure 4 A rotating internal gear 30 and a rotating planetary gear 31 are fixed inside the winding 1, and the support shaft 7 is fixedly arranged on the rotating internal gear 30.

[0064] Furthermore, the fault simulation system further includes a support frame 26, the support frame 26 is arranged around the winding 1 and has a preset distance from the winding 1, and the extrusion device 33 is fixed on the inner ring of the support frame 26.

[0065] Specifically, the support frame 26 surrounds the winding 1, and the outer peripheries on both sides are fixedly connected to the support platform 2 through the first connecting frame 5 and the second connecting frame 12 respectively, so that the support frame 26 can be fixed outside the winding 1.

[0066] Furthermore, at least one extrusion device 33 is provided, and the extrusion devices 33 are evenly arranged on the inner ring of the connecting frame.

[0067] Furthermore, the extrusion device 33 includes:

[0068] A guide ring 38, which is clamped on the inner ring of the connecting frame;

[0069] An extrusion plug 37, which is placed inside the guide ring 38 and is slidably connected to the guide ring 38, and the extrusion plug 37 reciprocates radially in the guide ring 38;

[0070] An extrusion head 41, which is fixed to one end of the extrusion plug 37 close to the winding 1.

[0071] The fault simulation system adopts a structural design with a connecting frame surrounding the winding 1. A preset spacing is maintained between the connecting frame and the winding 1 to ensure the movement space. The extrusion device 33 is fixed on the inner ring of the connecting frame. This arrangement enables the extrusion device 33 to stably apply radial pressure to the winding 1. At the same time, the preset spacing can ensure that the extrusion device 33 has sufficient movement space to simulate different degrees of deformation faults of the winding 1, improving the accuracy and controllability of fault simulation.

[0072] Multiple extrusion devices 33 are evenly distributed on the inner ring of the connecting frame, which can achieve simultaneous multi-point pressure application to the circumferential direction of the winding 1. At the same time, combined with the rotational movement of the winding 1, different extrusion devices 33 can sequentially simulate faults at different positions of the winding 1. This combined movement can simulate more complex and real fault states. By controlling the pressure magnitude and timing of each extrusion device 33, different types and degrees of faults can be simulated.

[0073] In this embodiment, there are five extrusion devices 33, which are evenly distributed on the upper half of the inner ring of the connecting frame through the buckle 36. The extrusion device 33 is connected to an external power supply through the external power supply terminal 6, and the external power supply connects to the extrusion plug 37 to control its reciprocating movement.

[0074] For the extrusion device 33, the guide ring 38 serves as a fixed guiding structure and is clamped on the inner ring of the connecting frame. Those skilled in the art can also use other methods to fix it to the connecting frame. The extrusion plug 37 is slidable in the guide ring 38 along the radial direction, ensuring the accuracy of the movement direction. The extrusion plug 37 reciprocates linearly, and the extrusion head 41 is fixed at the end of the extrusion plug 37 and directly contacts the winding 1, converting the movement into pressure on the winding 1.

[0075] Furthermore, the extrusion device 33 further includes:

[0076] A left spray head 40 and a right spray head 42, which are symmetrically arranged on both sides of the extrusion head 41;

[0077] And a cooling channel 39, the inlet of which is arranged on the guide ring 38.

[0078] Specifically, please refer to Figure 5 . The inlet of the cooling channel 39 is arranged on the guide ring 38, which can introduce a cooling medium. When the extrusion device 33 starts to move, the left spray head 40 and the right spray head 42 spray out insulating liquid to ensure the normal operation of the piston.

[0079] In summary, in this embodiment, the circumferential position of the winding 1 is adjusted by the first drive motor 10 and the gear set, and then the axial position of the winding 1 is adjusted by the second drive motor 15 through the connecting rod 29 to achieve precise positioning of the winding 1. The extrusion plug 37 moves radially back and forth within the guide ring 38, applying a preset pressure to the winding 1 through the extrusion head 41 to cause mechanical deformation. At the same time, the left and right spray heads 42 on both sides of the extrusion head 41 synchronously spray insulating liquid to the deformed area, and the insulation performance change of the deformed part is detected in real time, and the test environment temperature is controlled through the cooling channel 39 on the guide ring 38; multiple uniformly distributed extrusion devices 33 can work simultaneously or sequentially, combined with the rotational movement of the winding 1, to achieve precise simulation and comprehensive performance evaluation of different positions and different types of faults of the winding 1.

[0080] Embodiment 2

[0081] This embodiment provides a power transformer winding fault simulation and diagnosis system. Please refer to Figure 5 , including:

[0082] A high-frequency high-voltage control device, connected to a high-voltage switch and a DC source;

[0083] Multiple power transformer winding fault simulation devices as described in Embodiment 1, and the windings 1 in the power transformer winding fault simulation devices are respectively led out to the high-frequency high-voltage control device through bushings;

[0084] A signal acquisition device 53, which acquires and analyzes the structural vibration signals of the power transformer winding 1 fault simulation device;

[0085] Among them, the high-frequency high-voltage switch 50 is used to perform periodic actions to excite the power transformer winding 1 fault simulation device to generate structural vibration.

[0086] Specifically, by connecting the high-frequency high-voltage control device to the high-voltage switch and the DC source, a high-frequency high-voltage excitation is applied to the windings 1 in multiple fault simulation devices, and the signal acquisition device 53 acquires the structural vibration signals of the windings 1 in real time. Through this combined action of electrical excitation and mechanical deformation, combined with vibration signal analysis, the electrical characteristics, mechanical characteristics, and insulation performance of the windings 1 in different fault states can be comprehensively evaluated.

[0087] In this embodiment, the winding 1 in the power transformer winding 1 fault simulation device is a double-layer winding 1, and the double-layer winding 1 includes a high-voltage winding 1 and a low-voltage winding 1. The connection points of the bushings connecting the first winding 54, the third winding 56, and the fifth winding 58 (i.e., the first bushing 44, the third bushing 46, and the fifth bushing 48) are set as point A, which is a high-voltage connection point; the connection points of the bushings connecting the second winding 55, the fourth winding 57, and the sixth winding 59 (i.e., the second bushing 45, the fourth bushing 47, and the sixth bushing 49) are point B, which is a low-voltage connection point. The connection point A and the connection point B are connected to the high-frequency high-voltage switch 50 and the high-frequency high-voltage DC power supply 51, and the high-frequency high-voltage switch 50 performs periodic actions, thereby exciting the vibration of the UHV transformer body structure.

[0088] In this embodiment, the system further includes a high-speed camera 52, and the high-speed camera 52 is used to record the deformation process, capture in real time the deformation process of the winding 1 when it is subjected to extrusion force, record the dynamic development and propagation path of the deformation, and obtain the transient response data of the deformation of the winding 1.

[0089] Embodiment III

[0090] This embodiment provides a method for simulating and diagnosing faults in a power transformer winding. The transformer winding fault diagnosis system described in Embodiment II is adopted. Please refer to Figure 7 and Figure 8 , including:

[0091] Fix the winding 1;

[0092] Adjust the spatial position of the winding 1;

[0093] Drive the extrusion device 33 to move to the winding 1 and apply an extrusion force to the winding 1;

[0094] Excite the vibration of the winding 1;

[0095] Collect and analyze the vibration signal for fault diagnosis.

[0096] Further, in adjusting the spatial position of the winding 1, the first driving motor 10 controls the first transmission device 4 to rotate and unlock the winding 1; the second driving motor 15 controls the winding 1 to move axially to a preset position.

[0097] Further, multiple extrusion devices 33 move simultaneously or sequentially.

[0098] Specifically, in the step of adjusting the spatial position of the winding 1 and applying an extrusion force to the winding 1, i.e., simulating a fault, this step can be repeated to simulate the axial loosening fault of the winding 1 at different positions. Those skilled in the art can define the number of repetitions by themselves to meet the simulation requirements. Similarly, the movement rule of the extrusion device 33 is not restricted here either. One extrusion device 33 can be added in each repeated position adjustment, or it can be added without changing the position; or the operating extrusion device 33 can be changed while changing the position.

[0099] Further, obtain the vibration response characteristics of the winding 1 according to the vibration signal, and judge the fault level of the winding 1 based on the comparison between the characteristics and the threshold.

[0100] When using the traditional frequency method to analyze the vibration test signal components of multiple vibration sources such as the winding, iron core, and cooling system of a UHV transformer for non-stationary signals, false signals and aliasing problems may occur. Therefore, the instantaneous frequency needs to be used to represent the local characteristics of the signal. Then, time-frequency synchronous averaging is used to establish a signal model:

[0101]

[0102] where P is the number of segments into which the signal is divided, N is the equal number of sampling points set for each segment, and f0 is the acquisition frequency of the extracted periodic signal. Perform a Z-transform on the above formula and let Z = e j2πfΔ , ΔN = T = 1 / f0 and substitute it into the above formula to obtain the frequency response function of time-frequency synchronous averaging:

[0103]

[0104] Next, the obtained signal is extracted and analyzed through the Hilbert envelope extraction method to reduce the influence of on-site noise interference and random interference signals:

[0105]

[0106] The analytic signal z(t) of the signal x(t) can be expressed as z(t) = x(t) + jxH(t). Therefore

[0107]

[0108] Unwanted pseudo-components are removed in the EMD through the cross-correlation judgment criterion, and the decomposed intrinsic mode functions have the following correlation with the original signal:

[0109]

[0110] where ci is the intrinsic mode function of the obtained signal x is the basic mode component of the analytic signal, and n is the total number of basic mode components decomposed.

[0111] Since the EMD decomposition process is a local orthogonal decomposition, due to the errors in the decomposition process, n basic mode components c and m spurious components x will be decomposed, and c and x are not exactly the same. The m spurious components p are formed by the difference between the two. Therefore, the correlation relationship between the spurious component p and the original signal is:

[0112]

[0113] Finally, the cross-correlation coefficient between the decomposed mode component and the original signal can be defined as:

[0114]

[0115] Taking the magnitude of the cross-correlation coefficient between each component obtained by solution and the original signal as an index to evaluate the severity of the faults of each winding, the judgment index in this embodiment is as follows:

[0116] If 0.05 ≤ ρ < 0.35, it is judged that the winding is in a normal state;

[0117] If 0.35 ≤ ρ < 0.65, it is judged that the winding has a slight deformation;

[0118] If 0.65 ≤ ρ < 0.95, it is judged that the winding has a serious deformation.

[0119] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention pertains, based on the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A power transformer winding fault simulation device, characterized in that Comprising: Frame; Winding, which is rotatably connected to the frame; Locking mechanism, which is used to lock the winding, including a first transmission device and a first driving motor arranged on the frame; The first driving motor drives the first transmission device to rotate to unlock the winding; Fault simulation mechanism, including a second driving motor and an extrusion device; The second driving motor drives the winding to move away from or close to the frame in the axial direction; The extrusion device is placed on the outer periphery of the winding and points to the winding, and is used to generate a fault point on the surface of the winding.

2. The power transformer winding fault simulation device according to claim 1, wherein The frame includes a support base and a support platform vertically fixed on the support base; Optionally, the first transmission device is a gear, the gear is movably connected to the support platform through a fixing gasket, and the output shaft of the first driving motor is mechanically connected to the gear.

3. The power transformer winding fault simulation device according to claim 2, characterized in that The support shaft of the winding is rotatably connected to the support platform through a connecting rod; the second driving motor is fixed on the support platform, and the output shaft is mechanically connected to the connecting rod.

4. The power transformer winding fault simulation device according to claim 2, characterized in that, The fault simulation system further includes a support frame, the support frame is arranged around the winding and has a preset distance from the winding, and the extrusion device is fixed on the inner ring of the support frame; Optionally, at least one extrusion device is provided, and the extrusion devices are evenly arranged on the inner ring of the support frame.

5. The power transformer winding fault simulation device according to claim 4, characterized in that, The extrusion device includes: Guide ring, clamped on the inner ring of the support frame; Extrusion plug, placed inside the guide ring and slidably connected to the guide ring, and the extrusion plug reciprocates radially in the guide ring; Extrusion head, which is fixed at one end of the extrusion plug close to the winding.

6. The power transformer winding fault simulation device according to claim 5, characterized in that, The extrusion device further includes: Left spray head and right spray head, which are symmetrically arranged on both sides of the extrusion head; And a cooling channel, the inlet of the cooling channel is arranged on the guide ring.

7. A power transformer winding fault simulation and diagnosis system, characterized in that, Comprising: High-frequency high-voltage control device, connected to a high-voltage switch and a DC source; Multiple power transformer winding fault simulation devices as described in any one of claims 1-6, and the windings in the power transformer winding fault simulation devices are respectively led out to the high-frequency high-voltage control device through bushings; Signal acquisition device, which acquires and analyzes the structural vibration signals of the power transformer winding fault simulation device; Wherein, the high-voltage switch is used to perform periodic actions to excite the power transformer winding fault simulation device to generate structural vibration.

8. A method for simulating and diagnosing power transformer winding faults, characterized in that, Adopting the transformer winding fault diagnosis system as described in claim 7, including: Fixing the winding; Adjusting the spatial position of the winding; Driving the extrusion device to move to the winding and applying an extrusion force to the winding; Exciting the vibration of the winding; Acquiring and analyzing the vibration signals to perform fault diagnosis.

9. The power transformer winding fault simulation diagnosis method according to claim 8, characterized in that During the adjustment of the winding spatial position, the first driving motor controls the first transmission device to rotate to unlock the winding; The second driving motor controls the winding to move axially to a preset position; Optionally, multiple extrusion devices move simultaneously or sequentially.

10. The power transformer winding fault simulation diagnosis method according to claim 9, wherein, Obtain the vibration response characteristics of the winding according to the vibration signals, and judge the fault level of the winding according to the comparison between the characteristics and the threshold value.

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