Transformer winding deformation generation and detection device, method and deformation analysis method

Abstract

The present invention provides a transformer winding deformation generation and detection device, method and deformation analysis method. By setting up a transformer winding deformation generation and detection device, the transformer winding can be controlled to deform at multiple angles and to different degrees in the horizontal and vertical directions, and the oscillation wave signal of the transformer winding under different deformation conditions and the oscillation wave signal when the transformer winding is not deformed are accurately collected by a signal acquisition device, so as to provide a reliable data basis for subsequent transformer winding deformation analysis. Furthermore, based on the oscillation wave signal, by extracting the characteristics of the vibration amplitude center of gravity of the oscillation wave signal, the moving path of the oscillation wave distribution center of gravity at any frequency is obtained, that is, the oscillation wave center of gravity trajectory, and then the winding deformation position and deformation degree are judged according to the characteristics of the vibration amplitude center of gravity and the vibration center of gravity trajectory, so as to reliably and effectively evaluate the transformer winding performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of transformers, and in particular relates to a transformer winding deformation generation and detection device, method and deformation analysis method. Background Art

[0002] Transformer winding deformation is an important technical issue, which is directly related to the safe and stable operation of the transformer. Winding deformation is usually caused by external short-circuit shock, transportation, deterioration of internal insulation materials and earthquakes, and has a cumulative effect. After multiple short-circuit shocks, the winding may suddenly and severely lose stability and deformation, so timely and accurate detection of transformer winding deformation is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present invention discloses a transformer winding deformation generation and detection device, method and deformation analysis method, which simulates transformer deformation, accurately collects oscillation wave data generated during deformation, and effectively evaluates the performance of the transformer winding based on the oscillation wave data.

[0004] The present invention provides a transformer winding deformation generation and detection device, comprising:

[0005] Fixed frame;

[0006] A lifting and rotating device, one end of which is slidably connected to the fixing frame, and the other end of which is connected to the first deformation control device; the lifting and rotating device is used to control the transformer winding to move in the vertical direction;

[0007] The first deformation control device is arranged inside the transformer winding and connected to the lifting and rotating device; during the process of rotating and lifting the transformer winding, the first deformation control device controls the selected turn winding to undergo extrusion deformation;

[0008] A second deformation control device, disposed on the fixing frame, for controlling the selected turn winding to undergo compression or stretching deformation in a horizontal direction;

[0009] A signal acquisition device is connected to one end of the selected turn winding and is used to obtain the oscillation wave data of the transformer winding under different deformation conditions and the oscillation wave data when the transformer winding is not deformed.

[0010] Furthermore, the lifting and rotating device includes a lifting control motor, a lifting connecting rod, a lifting device fixed telescopic rod, a lifting and rotating device, a lifting connecting device and a slidable gasket;

[0011] The lifting control motor is connected to one end of a plurality of fixed telescopic rods of the lifting device, and the other end of the fixed telescopic rod of the lifting device is connected to the slidable gasket;

[0012] The plurality of slidable gaskets are respectively arranged on different edges of the fixing frame and are slidably connected to the edges;

[0013] The lifting control motor is also connected to one end of the plurality of lifting rotating devices;

[0014] The other end of the lifting and rotating device is connected to one end of the lifting and connecting device;

[0015] The other end of the lifting connection device is connected to the plurality of lifting connection rods, and the other ends of the plurality of lifting connection rods are connected to the first deformation control device.

[0016] Further, the first deformation control device includes an electric telescopic deformation rod, a deformation rod connecting device and an electric telescopic motor;

[0017] The other ends of the plurality of lifting connecting rods are respectively connected to the deformable rod connecting devices;

[0018] The electric telescopic motor is arranged on the surface of the deformation rod connecting device, and the electric telescopic motor is used to control the extension length of one end of the electric telescopic deformation rod;

[0019] The other ends of the plurality of electrically-operated telescopic deformation rods are connected to the deformation rod connection device.

[0020] Furthermore, the second lifting device includes: a mechanical clamp control motor, a mechanical clamp up-and-down displacement connecting rod, and a mechanical clamp;

[0021] The mechanical clamp control motor is connected to one end of the mechanical clamp up-and-down displacement connecting rod, and the other end of the mechanical clamp up-and-down displacement connecting rod is connected to the mechanical clamp;

[0022] The mechanical clamp control motor is used to control the mechanical clamp to grasp the selected turn winding.

[0023] Furthermore, it also includes: the high-frequency and high-voltage switch, the high-frequency and high-voltage DC source and the signal acquisition device are sequentially connected in series at both ends of the transformer winding;

[0024] The high-frequency and high-voltage switch is used to control the high-frequency and high-voltage direct current source to periodically discharge the transformer winding.

[0025] The present invention also provides a transformer deformation generation and detection method, the method comprising the steps of:

[0026] Acquire a first oscillation wave signal when the transformer winding is not deformed;

[0027] Controlling the transformer winding to rotate and lift in the vertical direction, and driving the selected turn winding to undergo extrusion deformation during the rotation and lifting process;

[0028] Controlling the selected turn winding to undergo compression or stretching deformation in the horizontal direction;

[0029] A second oscillation wave signal of the transformer winding under different deformation conditions is obtained.

[0030] The present invention also provides a transformer deformation analysis method, the method comprising the steps of:

[0031] Acquire a first oscillation wave signal when the transformer winding is not deformed;

[0032] Acquire a second oscillation wave signal of the transformer winding under different deformation conditions;

[0033] Analyzing and processing the first oscillation wave signal to obtain the position coordinates of the center of gravity of the oscillation wave distribution;

[0034] Analyzing and processing the second oscillation wave signal to obtain the position coordinates of the center of gravity of the oscillation wave distribution and the eccentricity of the trajectory of the center of gravity of the oscillation wave;

[0035] Comparing the position coordinates of the center of gravity of the oscillation wave distribution in the first oscillation wave signal and the second oscillation wave signal to obtain the fault position of the transformer winding;

[0036] The degree of deformation of the transformer winding is obtained according to the eccentricity of the center of gravity trajectory of the oscillation wave.

[0037] Furthermore, obtaining the position coordinates of the center of gravity of the oscillation wave distribution includes:

[0038] Establish a measurement point layout area within the area where the transformer vibration wave signal propagates;

[0039] Establishing a binary coordinate system in the measuring point arrangement area;

[0040] Calculating the sum of vibration amplitudes of all measuring points in the measuring point arrangement area;

[0041] Calculate the product of the vibration amplitude of each measuring point and the corresponding coordinates of each measuring point to obtain a weighted amplitude of each measuring point;

[0042] The position coordinates of the center of gravity of the oscillation wave distribution are obtained by dividing the sum of the weighted amplitudes of all the measuring points in the measuring point arrangement area by the total vibration amplitude.

[0043] Furthermore, the position coordinates of the center of gravity of the oscillation wave distribution at any frequency are obtained.

[0044] Furthermore, obtaining the eccentricity of the trajectory of the center of gravity of the oscillation wave includes:

[0045] An elliptical figure corresponding to the trajectory of the center of gravity of the oscillation wave is obtained according to the moving path of the center of gravity of the oscillation wave distribution at any frequency within a preset time, and the eccentricity of the elliptical figure is calculated.

[0046] Compared with the prior art, the present invention has at least the following technical effects:

[0047] The present invention can control the transformer winding to deform at multiple angles in the horizontal and vertical directions by setting up a transformer winding deformation generating and detecting device, and accurately collect the oscillation wave signal of the transformer winding under different deformation conditions and the oscillation wave signal when the transformer winding is not deformed through a signal acquisition device, thereby providing a reliable data basis for subsequent transformer winding deformation analysis.

[0048] Furthermore, the present invention also provides a transformer deformation analysis method, which is based on the oscillation wave signal. By extracting the characteristics of the vibration amplitude centroid of the oscillation wave signal, the moving path of the oscillation wave distribution centroid at any frequency within a preset time, that is, the oscillation wave centroid trajectory, is obtained. The winding deformation position and deformation degree are judged according to the characteristics of the vibration amplitude centroid and the vibration centroid trajectory, so as to reliably and effectively evaluate the transformer winding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 Schematic diagram of the structure of the transformer winding deformation generation and detection device in the first embodiment of the present invention;

[0050] Figure 2 Another structural schematic diagram of the transformer winding deformation generation and detection device in the first embodiment of the present invention;

[0051] Figure 3 Another structural schematic diagram of the transformer winding deformation generation and detection device in the first embodiment of the present invention;

[0052] Figure 4 Another structural schematic diagram of the transformer winding deformation generation and detection device in the first embodiment of the present invention;

[0053] Figure 5 Another structural schematic diagram of the transformer winding deformation generation and detection device in the first embodiment of the present invention;

[0054] Figure 6 It is the connection relationship diagram between the high voltage oscillating wave power supply system and the transformer winding;

[0055] Figure 7 A simplified flowchart of a transformer deformation analysis method in Embodiment 2 of the present invention;

[0056] Figure 8 This is another simplified flowchart of the transformer deformation analysis method in the second embodiment of the present invention.

[0057] In the figure, 1-transformer winding; 15-transformer traction winding; 16-transformer feeder winding; 17-transformer high-voltage winding; 18-transformer core; 19-transformer oil tank; 21-first electric telescopic deformation rod; 22-second electric telescopic deformation rod; 23-third electric telescopic deformation rod; 3-electric telescopic motor; 41-first mechanical clamp; 42-second mechanical clamp; 51-first mechanical clamp up and down displacement connecting rod; 52-second mechanical clamp up and down displacement connecting rod; 61-first mechanical clamp control motor; 62-second mechanical clamp control motor; 71-first lifting connecting rod; 72-second lifting connecting rod; 73-third lifting connecting rod; 74-fourth lifting connecting rod; 75-fifth lifting connecting rod; 76-sixth lifting connecting rod; 81-first Lifting connection device; 82-second lifting connection device; 83-third lifting connection device; 91-first lifting rotation device; 92-second lifting rotation device; 93-third lifting rotation device; 10-lifting control motor; 11-fixed frame; 121-first gasket movable slide rail; 122-first gasket movable slide rail; 123-first gasket movable slide rail; 131-first slidable gasket; 132-second slidable gasket; 133-third slidable gasket; 141-first lifting device fixed telescopic rod; 142-second lifting device fixed telescopic rod; 143-third lifting device fixed telescopic rod; 20-high-voltage oscillation wave power supply system; 201-high-frequency high-voltage DC source; 202-high-frequency high-voltage switch; 24-signal acquisition device. DETAILED DESCRIPTION

[0058] The following is a description of a transformer winding deformation generation and detection device, method and deformation analysis method of the present invention in conjunction with a schematic diagram, wherein preferred embodiments of the present invention are shown, and it should be understood that those skilled in the art can modify the present invention described herein while still achieving the beneficial 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 of the present invention.

[0059] The present invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the accompanying drawings are in very simplified form and are not in exact proportions, and are only used to facilitate and clearly assist in illustrating the purpose of the embodiments of the present invention.

[0060] Embodiment 1

[0061] refer to Figure 1-Figure 6 This embodiment discloses a transformer winding deformation generation and detection device, including: a fixed frame 11, a transformer winding 1, a lifting and rotating device, a first deformation control device, a second deformation control device and a signal acquisition device 24.

[0062] Specifically, the transformer winding 1 is respectively connected to a first deformation control device and a second deformation control device; a lifting and rotating device, one end of which is slidably connected to the fixed frame 11, and the other end is connected to the first deformation control device; the lifting and rotating device is used to control the movement of the transformer winding 1 in the vertical direction, and is also used to control the first deformation control device to move to a specified position; the first deformation control device is arranged inside the transformer winding 1 and is connected to the lifting and rotating device; during the process of rotation and lifting of the transformer winding 1, the first deformation control device controls the selected turn winding to undergo extrusion deformation; the second deformation control device is arranged on the fixed frame 11, and is used to control the selected turn winding to undergo extrusion or tensile deformation in the horizontal direction; a signal acquisition device is connected to one end of the selected turn winding, and is used to obtain oscillation wave data of the transformer winding 1 under different deformation conditions and oscillation wave data when the transformer winding 1 is not deformed.

[0063] In this embodiment, by setting up a transformer winding deformation generating and detecting device, the transformer winding 1 can be controlled to deform at multiple angles in the horizontal and vertical directions, and the oscillation wave signal of the transformer winding 1 under different deformation conditions and the oscillation wave signal of the transformer winding 1 when no deformation occurs are accurately collected through the signal acquisition device 24, thereby providing a reliable data basis for subsequent deformation analysis of the transformer winding 1.

[0064] In this embodiment, the transformer winding 1 includes: a transformer traction winding 15 (T winding), a transformer feeder winding 16 (F winding), a transformer high voltage winding 17 (HV winding), a transformer core 18 and a transformer oil tank 19 .

[0065] The possible connection relationship between the windings is: one end of the transformer high-voltage winding 17 is connected to the contact network to receive high-voltage power. The transformer high-voltage winding 17 is connected to the transformer feeder winding 16 through magnetic coupling of the transformer core 18. The transformer feeder winding 16 is electrically connected to the traction motor. The entire transformer (including the high-voltage winding, traction winding, feeder winding and core) is installed in the transformer oil tank 19, which is filled with transformer oil to ensure insulation and cooling.

[0066] In this embodiment, the fixing frame 11 is a cubic fixing frame, and may also be a fixing frame 11 of other shapes, which is not specifically limited here.

[0067] In this embodiment, the lifting and rotating device includes a lifting control motor 10, a lifting connecting rod, a lifting device fixed telescopic rod, a lifting and rotating device, a lifting connecting device and a slidable gasket.

[0068] Specifically, the lifting control motor 10 is connected to one end of multiple lifting device fixed telescopic rods, and the other end of the lifting device fixed telescopic rods is connected to the slidable gasket; the multiple slidable gaskets are respectively arranged on different edges of the fixed frame 11 and are slidably connected to the edges; the lifting control motor 10 is also connected to one end of multiple lifting rotating devices, and the multiple lifting rotating devices can move up and down in the vertical direction; the other ends of the multiple lifting rotating devices are respectively connected to one end of the multiple lifting connecting devices, and the lifting connecting devices are also connected to one end of the multiple lifting connecting rods, and the other ends of the multiple lifting connecting rods are connected to the first deformation control device.

[0069] In a specific embodiment, please refer to Figure 1-Figure 5 The lifting control motor 10 is connected to the first lifting device fixed telescopic rod 141, the second lifting device fixed telescopic rod 142 and the third lifting device fixed telescopic rod 143 respectively, and the first lifting device fixed telescopic rod 141, the second lifting device fixed telescopic rod 142 and the third lifting device fixed telescopic rod 143 are respectively connected to the first slidable pad 131, the second slidable pad 132 and the third slidable pad 133. The first slidable pad 131, the second slidable pad 132 and the third slidable pad 133 are respectively slidably connected to the edges of the top surface of the rectangular fixed frame 11 (that is, connected to the first pad movable slide rail 121, the second pad movable slide rail 122 and the third pad movable slide rail 123 shown in the figure).

[0070] During the lifting process, the lengths of the first lifting device fixed telescopic rod 141, the second lifting device fixed telescopic rod 142 and the second lifting device fixed telescopic rod 143 are adjusted in real time, so that the first slidable gasket 131, the second slidable gasket 132 and the third slidable gasket 133 can slide in different directions at the same time, controlling the lifting control motor 10 to rotate clockwise or counterclockwise in the horizontal direction.

[0071] In another specific embodiment, the lifting and rotating device also includes a first lifting and rotating device 91, a second lifting and rotating device 92 and a third lifting and rotating device 93, which are respectively connected to one end of the first lifting connection device 81, the second lifting connection device 82 and the third lifting connection device 83, and the other end of each lifting connection device is connected to two lifting connection rods. For example: the other end of the first lifting connection device 81 is respectively connected to one end of the first lifting connection rod 71 and the second lifting connection rod 72, and the other end of the second lifting connection device 82 is respectively connected to one end of the third lifting connection rod 73 and the fourth lifting connection rod 74; the other end of the third lifting connection device 83 is respectively connected to one end of the fifth lifting connection rod 75 and the sixth lifting connection rod 76; the other ends of the six lifting connection rods are respectively connected to the first deformation control device, and the first deformation control device is arranged inside the transformer winding 1.

[0072] During the lifting process, the lifting control motor 10 controls the lifting rotating device to move upward in the vertical direction, thereby driving the lifting connecting device and the lifting connecting rod to move upward, and during the lifting process, driving the first deformation control device to deform the selected turn winding at different degrees and angles, and then cooperate with the control motor to rotate clockwise or counterclockwise in the horizontal direction to realize the rotational lifting of the transformer winding 1, and during the rotational lifting process, driving the first deformation control device to deform the selected turn winding at different degrees and multiple angles.

[0073] Furthermore, in this embodiment, the first deformation control device includes an electric telescopic deformation rod, a deformation rod connecting device and an electric telescopic motor 3 .

[0074] Specifically, the lifting control motor 10 is connected to one end of the multiple lifting connecting rods, and the electric telescopic motor 3 is arranged on the surface of the deformation rod connecting device; the electric telescopic motor 3 is used to control the extension length of one end of the electric telescopic deformation rod; the other end of the multiple electric telescopic deformation rods is connected to the deformation rod connecting device.

[0075] In a specific embodiment, the first deformation control device includes a first electric telescopic deformation rod 21, a second electric telescopic deformation rod 22 and a third electric telescopic deformation rod 23, which are respectively fixed on one side of the deformation rod connection device. The lifting control motor 10 controls the first electric telescopic deformation rod 21, the second electric telescopic deformation rod 22 and the third electric telescopic deformation rod 23 to move to the gap between the selected turn winding and the adjacent winding. During the lifting process, the electric telescopic motor 3 controls the first electric telescopic deformation rod 21, the second electric telescopic deformation rod 22 and the third electric telescopic deformation rod 23 to extend beyond the radius of the transformer winding 1.

[0076] Furthermore, in this embodiment, the second lifting device includes: a mechanical clamp control motor, a mechanical clamp up-and-down displacement connecting rod, and a mechanical clamp.

[0077] Specifically, the mechanical clamp control motor is connected to one end of the mechanical clamp up and down displacement connecting rod, and the other end of the mechanical clamp up and down displacement connecting rod is connected to the mechanical clamp; the mechanical clamp control motor is used to control the mechanical clamp to clamp the selected turn winding.

[0078] In a specific embodiment, the second lifting device includes a first mechanical clamp control motor 61 and a second mechanical clamp control motor 62, which are respectively arranged on two opposite edges of the bottom of the fixed frame 11. The first mechanical clamp control motor 61 and the second mechanical clamp control motor 62 are respectively connected to the first mechanical clamp up-down displacement connecting rod 51 and the second mechanical clamp up-down displacement connecting rod 52, and the first mechanical clamp up-down displacement connecting rod 51 and the second mechanical clamp up-down displacement connecting rod 52 are respectively connected to the first mechanical clamp 41 and the second mechanical clamp 42.

[0079] The first mechanical clamp control motor 61 and the second mechanical clamp control motor 62 respectively control the first mechanical clamp up-down displacement connecting rod 51 and the second mechanical clamp up-down displacement connecting rod 52 to be in appropriate positions, thereby controlling the first mechanical clamp 41 and the second mechanical clamp 42 to accurately clamp the selected turn winding.

[0080] Furthermore, in this embodiment, a high-voltage oscillating wave power supply system 20 is also included. The high-voltage oscillating wave power supply system 20 includes a high-frequency and high-voltage switch 202 and a high-frequency and high-voltage direct current source 201 .

[0081] Specifically, the high-frequency and high-voltage switch 202 , the high-frequency and high-voltage direct current source 201 and the signal acquisition device 24 are connected in series at both ends of the transformer winding 1 .

[0082] The high-frequency and high-voltage switch 202 is used to control the high-frequency and high-voltage direct current source 201 to periodically discharge the transformer winding 1 .

[0083] In a specific embodiment, the signal acquisition device 24 is composed of an oscilloscope (or a data acquisition card) and a host computer. The high-voltage oscillation wave power supply system 20 and the signal acquisition device 24 can be combined to complete the oscillation wave test of the transformer winding 1. The basic principle is to apply DC excitation at one end of the winding, realize the transient change of the high-voltage DC signal through an electronic switch, and measure the oscillation signal at the end of the winding for analysis of the winding state.

[0084] In this embodiment, the deformation fault of the selected turn winding is simulated by the following steps:

[0085] S1. Place the transformer winding 1 in the center of the fault simulation platform and select a turn of the winding for fault deformation;

[0086] S2. Start the lifting control motor 10 in the lifting and rotating device to control the first electric telescopic deformation rod 21, the second electric telescopic deformation rod 22 and one end of the third electric telescopic deformation rod 23 to lift and clamp in the gap formed between the selected turn winding and the adjacent winding;

[0087] S3. Start the electric telescopic motor 3 to control the first electric telescopic deformation rod 21, the second electric telescopic deformation rod 22 and the third electric telescopic deformation rod 23 to extend beyond the winding radius;

[0088] S4. Start the mechanical clamp control motor to control the first mechanical clamp to move the connecting rod 51 up and down and the second mechanical clamp to move the connecting rod 52 up and down to a suitable position, and then control the first mechanical clamp 41 and the second mechanical clamp 42 to accurately grasp the selected turn winding;

[0089] S5. Start the lifting control motor 10 in the lifting and rotating device to drive the first electric telescopic deformation rod 21, the second electric telescopic deformation rod 22 and the third electric telescopic deformation rod 23 to squeeze the selected winding turn upward in the vertical direction, and at the same time start the first mechanical clamp control motor 61 and the second mechanical clamp control motor 62 to control the first mechanical clamp 41 and the second mechanical clamp 42 to stretch the selected winding turn inward or outward;

[0090] S6. After the deformation is completed, the lifting control motor 10 is started to extend the first lifting device fixed telescopic rod 141, the second lifting device fixed telescopic rod 142 and the second lifting device fixed telescopic rod 143 to a suitable length, and the positions of the first slidable gasket 131, the second slidable gasket 132 and the third slidable gasket 133 at the connection on the first gasket movable rail 121, the second gasket movable rail 122 and the third gasket movable rail 123 are adjusted during the extension and retraction to achieve the purpose of rotating the lifting device, and then the operation of step S5 is performed to achieve the winding deformation within a certain angle;

[0091] S7. Repeat the operations of steps S2 to S6 to perform deformation faults of different deformation modes, different deformation angles and different deformation degrees on the selected turn winding.

[0092] In this embodiment, the following steps are performed to test the selected winding oscillation wave and obtain data:

[0093] S8. Define the upper end of the transformer high voltage winding 17 as the connection point A, and the lower end as the connection point B;

[0094] S9. Connect the connection points A and B of the traction transformer winding 1 to the high-frequency high-voltage switch 202 and the high-frequency high-voltage DC source 201, and the high-frequency high-voltage switch 202 performs periodic operation, thereby periodically charging and discharging points A and B;

[0095] S10. Repeat the above process to obtain the transformer oscillation wave waveform data under different fault conditions and the oscillation wave waveform data under intact conditions through the signal acquisition device 24.

[0096] Embodiment 2

[0097] Please refer to Figure 7-Figure 8 This embodiment provides a transformer deformation analysis method. After using the transformer winding deformation generation and detection device in Embodiment 1 to simulate the transformer winding deformation fault and obtain corresponding oscillation wave data, the transformer deformation detection method provided in this embodiment is used to analyze the obtained oscillation wave data.

[0098] Specifically, the detection method comprises the following steps:

[0099] S100. Analyze and process the first oscillation wave signal to obtain the position coordinates of the center of gravity of the oscillation wave distribution;

[0100] S200. Analyze and process the second oscillation wave signal to obtain the position coordinates of the center of gravity of the oscillation wave distribution and the eccentricity of the trajectory of the center of gravity of the oscillation wave;

[0101] S300. Compare the position coordinates of the center of gravity of the oscillation wave distribution in the first oscillation wave signal and the second oscillation wave signal to obtain the fault position of the transformer winding 1;

[0102] S400. Compare the eccentricity of the center of gravity trajectory of the oscillation wave with the set threshold value, and obtain the deformation degree of the transformer winding 1 according to the comparison result.

[0103] In step S1, the vibration wave signal collected by the signal acquisition device 24 is subjected to feature extraction of the vibration amplitude center of gravity, and the vibration distribution characteristics of the oscillation wave are studied and analyzed from two aspects: the vibration amplitude center of gravity and the vibration center of gravity trajectory. An xy coordinate system is established on one side where the oscillation wave signal measurement points are arranged, where x and y represent the horizontal direction and the vertical direction, respectively. When a deformation fault occurs in the transformer, the distribution center of gravity of the vibration wave signal is represented as the result of the weighted average of the oscillation wave amplitude of each measurement point according to its coordinates, and in this way, the oscillation wave center of gravity distribution information of each measurement point is integrated with its corresponding oscillation signal.

[0104] The specific calculation steps of the centroid of the vibration wave signal distribution are as follows:

[0105] S1001. Establishing a measurement point layout area in the area where the transformer vibration wave signal propagates;

[0106] S1002. Establishing a binary xy axis coordinate system in the measuring point arrangement area;

[0107] S1003. Calculate the sum of the vibration amplitudes of all measuring points in the measuring point arrangement area;

[0108] S1004 calculates the product value of the vibration amplitude of each measuring point and the x-axis coordinate corresponding to each measuring point, and calculates the product value of the vibration amplitude of each measuring point and the y-axis coordinate corresponding to each measuring point;

[0109] S1005. Dividing the sum of the product values ​​of all the measuring points in the measuring point arrangement area by the total vibration amplitude to obtain the x-axis coordinate of the centroid of the oscillation wave distribution;

[0110] ;

[0111] Among them, x j is the x-axis position coordinate of the ith vibration measurement point of the oscillation wave signal, v i,j is the jth harmonic component of the ith measuring point, and N is the total number of vibration measuring points.

[0112] And the y-axis coordinate of the center of gravity of the oscillation wave distribution is obtained by dividing the sum of the product values ​​of all the measuring points in the measuring point arrangement area by the total vibration amplitude:

[0113] ;

[0114] Among them, y j is the y-axis position coordinate of the i-th vibration measurement point of the oscillation wave signal.

[0115] The centroid of the oscillation wave distribution is expressed as the weighted average of the different frequency components of the oscillation waves at each measuring point in space, reflecting the uneven spatial distribution of the oscillation wave amplitudes at each measuring point, and can roughly reflect the location where the winding deformation is most severe. If the location of the winding deformation fault changes, it will have a significant impact on the spatial distribution of the oscillation wave amplitudes at each measuring point, resulting in a significant change in the centroid of the oscillation wave amplitude.

[0116] According to the above formula for the centroid of the oscillation wave distribution, the centroid coordinates of the oscillation wave distribution at frequency f can be obtained: The expression is:

[0117] ;

[0118] in, is the x-axis coordinate of the center of gravity of the oscillation wave distribution at frequency f, is the y-axis coordinate of the center of gravity of the oscillation wave distribution at frequency f, is the jth harmonic component of the ith measuring point at frequency f.

[0119] Furthermore, the feature extraction of the trajectory of the center of gravity of the oscillation wave is performed according to the moving path of the center of gravity of the oscillation wave distribution at any frequency within a preset period of time. The trajectory of the center of gravity of the oscillation wave is:

[0120] ;

[0121] ;

[0122] Where x(t) j Expressed as the x-axis coordinate of the center of gravity of the oscillation wave changing with time, y(t) j Expressed as the y-axis coordinate of the center of gravity of the oscillation wave changing with time, v(t) i,j It is expressed as the jth harmonic component of the ith measuring point varying with time.

[0123] Furthermore, an elliptical figure corresponding to the trajectory of the center of gravity of the oscillation wave is obtained according to the moving path of the center of gravity of the oscillation wave distribution at any frequency within a preset time, thereby calculating the eccentricity of the elliptical figure. The specific calculation process is as follows:

[0124] S2001. Calculate the semi-major axis and semi-minor axis of the ellipse formed by the trajectory of the center of gravity of the oscillation wave:

[0125] ;

[0126] ;

[0127] Among them, a is the semi-major axis of the ellipse, b is the semi-minor axis of the ellipse, is the length of the chord through the center of the ellipse.

[0128] S2002. Calculate the length of the chord through the center of the ellipse:

[0129] ;

[0130] in, Expressed as the time period of the jth harmonic.

[0131] S2003. Calculate the main axis inclination angle of the center of gravity trajectory of the oscillation wave :

[0132] ;

[0133] Among them, t m Expressed as The sampling time of the sampling point when it is the major axis of the ellipse.

[0134] S2004. Calculate the eccentricity of the trajectory of the center of gravity of the oscillation wave :

[0135] .

[0136] In step S3, please refer to Table 1 and calculate the centroid coordinates of the oscillation wave distribution under winding deformation. The coordinates of the center of gravity of the oscillation wave distribution in the normal state of the winding By comparison, we can know the approximate fault location of transformer winding 1.

[0137] Table 1

[0138]

[0139] In step S4, please refer to Table 2, set thresholds according to the degree of deformation, compare the eccentricity with the two thresholds, and thus obtain the degree of deformation of the transformer winding 1. It can be seen from the table that the smaller the eccentricity, the greater the degree of deformation.

[0140] Table 2

[0141]

[0142] In summary, this embodiment is based on the oscillation wave signal, and by extracting the characteristics of the vibration amplitude center of gravity of the oscillation wave signal, the moving path of the oscillation wave distribution center of gravity at any frequency within a preset time period is obtained, that is, the trajectory of the oscillation wave center of gravity. The deformation position and deformation degree of the winding are judged according to the characteristics (eccentricity) of the vibration amplitude center of gravity and the vibration center of gravity trajectory, and the transformer winding performance can be reliably and effectively evaluated. Compared with the prior art and the frequency response method, the deformation analysis method provided by this embodiment has stronger anti-interference ability and better test repeatability, and the sensitivity of the oscillation wave method to specific faults of the transformer winding is relatively high, and the state of transformer winding deformation can be more accurately identified.

[0143] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A transformer winding deformation generating and detecting device, characterized in that: include: Fixed frame; A lifting and rotating device, one end of which is slidably connected to the fixing frame, and the other end of which is connected to the first deformation control device; the lifting and rotating device is used to control the transformer winding to move in the vertical direction; The first deformation control device is arranged inside the transformer winding and connected to the lifting and rotating device; during the process of rotating and lifting the transformer winding, the first deformation control device controls the selected turn winding in the transformer winding to perform extrusion deformation; A second deformation control device, disposed on the fixing frame, for controlling the selected turn winding to undergo compression or stretching deformation in a horizontal direction; A signal acquisition device connected to one end of the selected turn winding, used to obtain oscillation wave data of the transformer winding under different deformation conditions and oscillation wave data when the transformer winding is not deformed; The lifting and rotating device includes a lifting control motor, a lifting connecting rod, a lifting device fixed telescopic rod, a lifting and rotating device, a lifting connecting device and a slidable gasket; The lifting control motor is connected to one end of a plurality of fixed telescopic rods of the lifting device, and the other end of the fixed telescopic rod of the lifting device is connected to the slidable gasket; The plurality of slidable gaskets are respectively arranged on different edges of the fixing frame and are slidably connected to the edges; The lifting control motor is also connected to one end of the plurality of lifting rotating devices; The other end of the lifting and rotating device is connected to one end of the lifting and connecting device; The other end of the lifting connection device is connected to the plurality of lifting connection rods, and the other ends of the plurality of lifting connection rods are connected to the first deformation control device; The first deformation control device includes an electric telescopic deformation rod, a deformation rod connecting device and an electric telescopic motor; The other ends of the plurality of lifting connecting rods are respectively connected to the deformable rod connecting devices; The electric telescopic motor is arranged on the surface of the deformation rod connecting device, and the electric telescopic motor is used to control the extension length of one end of the electric telescopic deformation rod; The other ends of the plurality of electrically-operated telescopic deformation rods are connected to the deformation rod connection device.

2. The transformer winding deformation generation and detection device according to claim 1, characterized in that: The second deformation control device comprises: a mechanical clamp control motor, a mechanical clamp up-and-down displacement connecting rod and a mechanical clamp; The mechanical clamp control motor is connected to one end of the mechanical clamp up-and-down displacement connecting rod, and the other end of the mechanical clamp up-and-down displacement connecting rod is connected to the mechanical clamp; The mechanical clamp control motor is used to control the mechanical clamp to grasp the selected turn winding.

3. The transformer winding deformation generation and detection device according to claim 1, characterized in that: It also includes a high-voltage oscillating wave power supply system, which includes a high-frequency high-voltage switch and a high-frequency high-voltage direct current source; The high-frequency and high-voltage switch, the high-frequency and high-voltage DC source and the signal acquisition device are sequentially connected in series at both ends of the transformer winding; The high-frequency and high-voltage switch is used to control the high-frequency and high-voltage direct current source to periodically discharge the transformer winding.

4. A method for generating and detecting transformer winding deformation, characterized in that: The transformer winding deformation generation and detection device according to any one of claims 1 to 3 is used to perform deformation generation and deformation detection, and the method comprises the steps of: Acquire a first oscillation wave signal when the transformer winding is not deformed; Controlling the transformer winding to rotate and lift in the vertical direction, and driving the selected turn winding to undergo extrusion deformation during the rotation and lifting process; Controlling the selected turn winding to undergo compression or stretching deformation in the horizontal direction; A second oscillation wave signal of the transformer winding under different deformation conditions is obtained.

5. A transformer winding deformation analysis method, characterized in that: A deformation analysis is performed on a transformer winding deformed by the transformer winding deformation generating and detecting device according to any one of claims 1 to 3, the method comprising the steps of: Acquire a first oscillation wave signal when the transformer winding is not deformed; Acquire a second oscillation wave signal of the transformer winding under different deformation conditions; Analyzing and processing the first oscillation wave signal to obtain the position coordinates of the center of gravity of the oscillation wave distribution; Analyzing and processing the second oscillation wave signal to obtain the position coordinates of the oscillation wave distribution center of gravity and the eccentricity of the oscillation wave center of gravity trajectory; Comparing the position coordinates of the center of gravity of the oscillation wave distribution in the first oscillation wave signal and the second oscillation wave signal to obtain the fault position of the transformer winding; The degree of deformation of the transformer winding is obtained according to the eccentricity of the center of gravity trajectory of the oscillation wave.

6. The transformer winding deformation analysis method according to claim 5, characterized in that: Obtaining the position coordinates of the center of gravity of the oscillation wave distribution includes: Establish a measurement point layout area within the area where the transformer vibration wave signal propagates; Establishing a binary coordinate system in the measuring point arrangement area; Calculating the sum of vibration amplitudes of all measuring points in the measuring point arrangement area; Calculate the product of the vibration amplitude of each measuring point and the corresponding coordinates of each measuring point to obtain a weighted amplitude of each measuring point; The position coordinates of the center of gravity of the oscillation wave distribution are obtained by dividing the sum of the weighted amplitudes of all the measuring points in the measuring point arrangement area by the total vibration amplitude.

7. The transformer winding deformation analysis method according to claim 6, characterized in that: Get the position coordinates of the center of gravity of the oscillation wave distribution at any frequency.

8. The transformer winding deformation analysis method according to claim 6, characterized in that: Obtaining the eccentricity of the center of gravity trajectory of the oscillation wave includes: An elliptical figure corresponding to the trajectory of the center of gravity of the oscillation wave is obtained according to the moving path of the center of gravity of the oscillation wave distribution at any frequency, and the eccentricity of the elliptical figure is calculated.

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