A system and method for online monitoring vibration of power transformer windings

Abstract

The invention discloses an online monitoring system and method for the vibration of a power transformer winding, and the invention relates to the field of transformer winding vibration monitoring. The system comprises a parameter setting module, an error signal detection module, an error signal verification module and a signal data latching module; the parameter setting module sets a plurality of vibration sensors on a transformer and a reference plane, obtains vibration signals, establishes a two-dimensional plane model, and obtains the positions of the vibration sensors on the transformer; the error signal detection module analyzes the state of the transformer winding according to the difference of the vibration signals set on the transformer and the reference plane; the error signal verification module compares the difference of the vibration signal with the vibration signal in the historical data, and analyzes whether the vibration signal will cause the winding to generate an early warning situation; the signal data latching module moves the vibration sensor set on the transformer, obtains the characteristics of the vibration signal when the vibration sensor moves to the optimal position, and encrypts and saves the characteristics of the vibration signal.

Description

Technical Field

[0001] The invention relates to the technical field of transformer winding monitoring, and in particular to an online monitoring system and method for power transformer winding vibration. Background Art

[0002] A transformer is a device that changes AC voltage through the principle of electromagnetic induction. It is often used in factories because of the high power consumption in factories.

[0003] Because the transformer is heavy and large in size, it needs to be transported to various factories. However, the degree of winding compression gradually decreases during transportation, installation, operation and external short-circuit accidents, causing the winding to loosen, reducing the transformer's ability to resist short-circuit current shocks and posing a huge threat. The vibration of the transformer box mainly comes from the vibration of the transformer body and the vibration of the cooling system device. The vibration of the body mainly includes the vibration of the winding and the iron core. After the transformer is powered on, current passes through the winding, forming a magnetic field in the iron core and the winding. When the voltage is very low, the vibration of the iron core can be ignored. The vibration mainly comes from the vibration of the winding. The vibration of the winding is caused by the interaction of the current in the winding under the influence of leakage inductance to generate electromotive force, which is usually proportional to the square of the current. In order to ensure the normal operation of the power transformer, prevent the winding from loosening and eventually develop into causative faults such as severe deformation of the winding or winding short circuit.

[0004] Although vibration sensors can be installed on the transformer to monitor whether the windings have a winding warning condition, it is not possible to ensure that the vibration signal monitored on the transformer is completely derived from the transformer itself during transportation. It may also be derived from the signal during vehicle transportation. Therefore, multiple vibration sensors need to be set up to prevent vibration signal errors and avoid the monitored signals from affecting the windings. At the same time, when a signal error occurs, the cause of the error needs to be further verified and improved to determine whether it is due to a problem with the transformer itself or the movement of the vibration sensor. Summary of the invention

[0005] The object of the present invention is to provide a system and method for online monitoring vibration of power transformer windings to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an online monitoring system for vibration of power transformer windings, the system comprising a parameter setting module, an error signal detection module, an error signal verification module and a signal data latch module;

[0007] The parameter setting module obtains vibration signals by setting a number of vibration sensors on the transformer and the reference plane, and establishes a two-dimensional plane model to obtain the positions of the vibration sensors on the transformer;

[0008] The error signal detection module analyzes the state of the transformer winding according to the difference of the vibration signal set on the transformer and the reference surface; when it is detected that the difference of the vibration signal causes the transformer winding to generate a pre-tightening force, the signal is decomposed and the characteristics of the signal are obtained;

[0009] The error signal verification module compares the vibration signal difference with the vibration signal in the historical data to analyze whether the vibration signal will cause the winding to generate an early warning condition;

[0010] The signal data latch module moves the vibration sensor disposed on the transformer, obtains the characteristics of the vibration signal when the vibration sensor moves to the optimal position, and encrypts and stores the characteristics of the vibration signal;

[0011] The signal data latch module is connected to the parameter setting module, the error signal detection module, and the error signal verification module. Further, the parameter setting module includes a sensor setting monitoring unit, a two-dimensional model building unit, a sensor positioning unit, and a vibration signal receiving unit;

[0012] The sensor setting monitoring unit obtains the signal of the vibration sensor by setting a plurality of vibration sensors on the transformer and the reference surface;

[0013] The two-dimensional model building unit builds a two-dimensional plane model to obtain the moving distance of the vibration sensor on the transformer;

[0014] The sensor positioning unit performs real-time positioning of the moving position of the vibration sensor on the transformer;

[0015] The vibration signal receiving unit receives vibration signals from the vibration sensor on the transformer and the reference surface respectively.

[0016] Further, the error signal detection module includes a vibration signal difference acquisition unit, a transformer winding state unit, a vibration signal decomposition unit and a signal feature acquisition unit;

[0017] The vibration signal difference acquisition unit acquires vibration signals from vibration sensors respectively arranged on the transformer and the reference plane, and determines whether the difference between the vibration signal arranged on the transformer and the vibration signal on the reference plane causes an early warning of the transformer winding;

[0018] The transformer winding status unit analyzes the winding status of the transformer according to the vibration signal displayed on the transformer;

[0019] The vibration signal decomposition unit, when detecting that the signal difference of the vibration sensors respectively arranged on the transformer and the reference plane causes an early warning signal of the transformer winding state, decomposes the vibration signal difference into a static vibration signal and a dynamic vibration signal;

[0020] The signal feature acquisition unit acquires the features of the dynamic vibration signal, and retrieves data from historical data for comparison and analysis based on the features of the dynamic vibration signal.

[0021] Further, the error signal verification module includes a similar peak feature comparison unit and a position adjustment unit;

[0022] The similar peak feature comparison unit obtains the vibration signal feature, compares and analyzes the vibration signal feature with the signal feature in the historical data, and analyzes the similarity of the features according to the comparison result, so as to determine whether the decomposed signal contains the first vibration signal;

[0023] The position adjustment unit, if detecting that the feature similarity is low, obtains the current position of the vibration sensor on the transformer and adjusts the position of the vibration sensor on the transformer.

[0024] Further, the signal data latch module includes a mobile signal feature extraction unit, a data mark prompt unit and a signal data encryption unit;

[0025] The mobile signal feature extraction unit monitors and extracts the vibration signal feature generated when the vibration sensor moves on the transformer, and the feature is the feature when no early warning signal occurs in the transformer winding;

[0026] The data marking prompting unit marks the optimal moving position of the vibration sensor on the transformer;

[0027] The signal data encryption unit encrypts and stores the extracted vibration signal features.

[0028] The method comprises the following steps:

[0029] A plurality of vibration sensors are respectively arranged on the transformer and the reference plane to obtain a plurality of vibration signals;

[0030] Obtain transformer winding preload and generate monitoring and early warning signals;

[0031] Set up a two-dimensional plane model and locate the real-time position of the vibration sensor to obtain the positioning information of the vibration sensor;

[0032] Obtain the difference in signal amplitude between the vibration sensor placed on the transformer and the vibration sensor on the reference surface. If the difference in signal amplitude causes the transformer winding preload to reach a warning state, the difference in signal amplitude contains a signal error, and the vibration signal is decomposed.

[0033] The decomposed signal is compared and analyzed with the same peak signal. If the same peak signal generates a warning signal, the decomposed signal contains the first vibration signal; if the same amplitude decomposed signal does not generate a warning signal, the position of the vibration sensor on the transformer is tampered with, and the position of the sensor on the transformer is adjusted;

[0034] If the difference in signal amplitudes does not cause the transformer winding preload to reach a warning state, the difference in signal amplitudes is a transformer vibration signal;

[0035] The best vibration signal when the vibration sensor is at the best position of the transformer is obtained, the vibration signal characteristics are extracted, and the vibration signal characteristic data is encrypt.

[0036] Decompose the vibration signal to obtain the continuous time period T = {t1, t2, t3, ..., t n}, the peak information of the dynamic signal in different time periods is extracted as W = {w1,w2,w3...w n}, n refers to the number of time items, w n It refers to the peak value of the nth time period, and obtains the same signal as the peak signal;

[0037] Get dynamic signal j With adjacent dynamic signal t j+1 The horizontal and vertical coordinates of the peak value;

[0038] According to the formula:

[0039] Among them, RF(t j ,t j+1 ) refers to the ratio of the sum of the two dynamic signal areas to the total area, and f(x) refers to the function of the dynamic signal. When RF(t j ,t j+1 ) and the same peak signal is less than the first error, it indicates that the dynamic signal is highly similar to the same peak signal, and the decomposed signal contains the first vibration signal;

[0040] If RF(t j ,t j+1 ) when the ratio error between the dynamic signal and the same peak signal is greater than the first error, it indicates that the similarity between the dynamic signal and the same peak signal is low, and other coordinate signals in the dynamic signal are selected and intercepted.

[0041] If it is detected that the decomposed signal does not contain the first vibration signal, obtain the position signal of the vibration sensor on the transformer, set the current position of the vibration sensor on the transformer as P, obtain the warning signal when the vibration sensor is on the transformer, and when it is detected that the peak value of the warning signal is higher than the first preset value, move the position of the vibration sensor on the transformer, and when it is detected that the moved distance makes the warning signal lower than the first preset value, mark the position of the vibration sensor after the moving distance and the characteristics of the vibration signal corresponding to the moved distance;

[0042]

[0043] Where H is the distance the vibration sensor moves on the transformer; (a v , b v ) refers to the coordinates when the vibration sensor is not moving, (a r , b r ) refers to the coordinates of the vibration sensor after it moves. When it is detected that H is greater than the second preset value, it is prompted to stop moving.

[0044] The set formed by the influence of the vibration sensor moving distance on the vibration signal peak value is: H l It refers to the distance that the vibration sensor moves on the transformer for the first time, c l It refers to the peak value corresponding to the first time the vibration sensor moves on the transformer;

[0045]

[0046] Z HC It refers to the multiple of the influence of the moving distance of the vibration sensor on the peak value of the vibration signal; q H Refers to the score corresponding to the moving distance of the vibration sensor, q c Refers to the score corresponding to the peak value of the vibration signal;

[0047] When Z is detected HC =1, it means that the distance moved by the vibration sensor has a high degree of influence on the peak value of the vibration signal, and the best vibration signal is achieved;

[0048] When Z is detected HC When ≠1, it means that the distance moved by the vibration sensor has a low impact on the peak value of the vibration signal and the optimal vibration signal is not achieved.

[0049] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0050] By setting the vibration sensor on the transformer and the reference plane, it is analyzed whether the difference of the vibration signal generated will produce a signal error, whether the signal error is completely caused by the transformer body, and whether there are other signals that cause the transformer winding to produce an early warning signal; according to this method, the specific cause of the error can be accurately determined, whether it is due to the transformer itself or the vibration sensor has not moved to the specified position, which improves the resolution ability when judging the winding problem. According to the degree of influence of the vibration sensor moving distance on the vibration signal peak, it can be analyzed whether the vibration sensor moving position on the transformer will change the preload of the winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0052] Figure 1 It is a schematic diagram of the steps of an online monitoring system and method for vibration of power transformer windings of the present invention;

[0053] Figure 2 The present invention is a schematic diagram of the module composition of a system and method for online monitoring vibration of power transformer windings. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] See also Figure 1-2 , the present invention provides a technical solution:

[0056] An online monitoring system for vibration of a power transformer winding, the system comprising a parameter setting module, an error signal detection module, an error signal verification module and a signal data latch module;

[0057] The parameter setting module obtains vibration signals by setting a number of vibration sensors on the transformer and the reference plane, and establishes a two-dimensional plane model to obtain the positions of the vibration sensors on the transformer;

[0058] The error signal detection module analyzes the state of the transformer winding according to the difference of the vibration signal set on the transformer and the reference surface; when it is detected that the difference of the vibration signal causes the transformer winding to generate a pre-tightening force, the signal is decomposed and the characteristics of the signal are obtained;

[0059] The error signal verification module compares the vibration signal difference with the vibration signal in the historical data to analyze whether the vibration signal will cause the winding to generate an early warning condition;

[0060] The signal data latch module moves the vibration sensor disposed on the transformer, obtains the characteristics of the vibration signal when the vibration sensor moves to the optimal position, and encrypts and stores the characteristics of the vibration signal;

[0061] The signal data latch module is connected to the parameter setting module, the error signal detection module, and the error signal verification module. Further, the parameter setting module includes a sensor setting monitoring unit, a two-dimensional model building unit, a sensor positioning unit, and a vibration signal receiving unit;

[0062] The sensor setting monitoring unit obtains the signal of the vibration sensor by setting a plurality of vibration sensors on the transformer and the reference surface;

[0063] The two-dimensional model building unit builds a two-dimensional plane model to obtain the moving distance of the vibration sensor on the transformer;

[0064] The sensor positioning unit performs real-time positioning of the moving position of the vibration sensor on the transformer;

[0065] The vibration signal receiving unit receives vibration signals from the vibration sensor on the transformer and the reference surface respectively;

[0066] The reference plane is a vibration sensor set when the transformer is in contact with the ground. The vibration sensor monitors the vibration signal of the ground. The vibration signal monitored by the sensor installed on the transformer is the transformer vibration signal and the signal on the reference plane. Therefore, the error signal formed should be the vibration signal of the transformer based on the reference plane under correct circumstances.

[0067] Further, the error signal detection module includes a vibration signal difference acquisition unit, a transformer winding state unit, a vibration signal decomposition unit and a signal feature acquisition unit;

[0068] The vibration signal difference acquisition unit acquires vibration signals from vibration sensors respectively arranged on the transformer and the reference plane, and determines whether the difference between the vibration signal arranged on the transformer and the vibration signal on the reference plane causes an early warning of the transformer winding;

[0069] The transformer winding status unit analyzes the winding status of the transformer according to the vibration signal displayed on the transformer;

[0070] The vibration signal decomposition unit, when detecting that the signal difference of the vibration sensors respectively arranged on the transformer and the reference plane causes an early warning signal of the transformer winding state, decomposes the vibration signal difference into a static vibration signal and a dynamic vibration signal;

[0071] The signal feature acquisition unit acquires the features of the dynamic vibration signal and retrieves data from historical data for comparison and analysis according to the features of the dynamic vibration signal;

[0072] The historical data is one of the saved dynamic vibration signals.

[0073] Further, the error signal verification module includes a similar peak feature comparison unit and a position adjustment unit;

[0074] The similar peak feature comparison unit obtains the vibration signal feature, compares and analyzes the vibration signal feature with the signal feature in the historical data, and analyzes the similarity of the features according to the comparison result, so as to determine whether the decomposed signal contains the first vibration signal;

[0075] The position adjustment unit, if detecting that the feature similarity is low, obtains the current position of the vibration sensor on the transformer and adjusts the position of the vibration sensor on the transformer.

[0076] Further, the signal data latch module includes a mobile signal feature extraction unit, a data mark prompt unit and a signal data encryption unit;

[0077] The mobile signal feature extraction unit monitors and extracts the vibration signal feature generated when the vibration sensor moves on the transformer, and the feature is the feature when no early warning signal occurs in the transformer winding;

[0078] The data marking prompting unit marks the optimal moving position of the vibration sensor on the transformer;

[0079] The signal data encryption unit encrypts and stores the extracted vibration signal features.

[0080] The method comprises the following steps:

[0081] A plurality of vibration sensors are respectively arranged on the transformer and the reference plane to obtain a plurality of vibration signals;

[0082] Obtain transformer winding preload and generate monitoring and early warning signals;

[0083] Set up a two-dimensional plane model and locate the real-time position of the vibration sensor to obtain the positioning information of the vibration sensor;

[0084] Obtain the difference in signal amplitude between the vibration sensor placed on the transformer and the vibration sensor on the reference surface. If the difference in signal amplitude causes the transformer winding preload to reach a warning state, the difference in signal amplitude contains a signal error, and the vibration signal is decomposed.

[0085] The decomposed signal is compared and analyzed with the same peak signal. If the same peak signal generates a warning signal, the decomposed signal contains the first vibration signal; if the same amplitude decomposed signal does not generate a warning signal, the position of the vibration sensor on the transformer is tampered with, and the position of the sensor on the transformer is adjusted;

[0086] If the difference in signal amplitudes does not cause the transformer winding preload to reach a warning state, the difference in signal amplitudes is a transformer vibration signal;

[0087] The best vibration signal when the vibration sensor is at the best position of the transformer is obtained, the vibration signal characteristics are extracted, and the vibration signal characteristic data is encrypt.

[0088] Decompose the vibration signal to obtain the continuous time period T = {t1, t2, t3, ..., t n}, the peak information of the dynamic signal in different time periods is extracted as W = {w1,w2,w3...w n}, n refers to the number of time items, w n It refers to the peak value of the nth time period, and obtains the same signal as the peak signal;

[0089] Get dynamic signal j With adjacent dynamic signal t j+1 The horizontal and vertical coordinates of the peak value;

[0090] According to the formula:

[0091] Among them, RF(t j ,t j+1 ) refers to the ratio of the sum of the two dynamic signal areas to the total area, and f(x) refers to the function of the dynamic signal. When RF(t j ,t j+1 ) and the same peak signal is less than the first error, it indicates that the dynamic signal is highly similar to the same peak signal, and the decomposed signal contains the first vibration signal;

[0092] If RF(t j ,t j+1 ) when the ratio error between the dynamic signal and the same peak signal is greater than the first error, it indicates that the dynamic signal is less similar to the same peak signal, and other coordinate signals in the dynamic signal are selected and intercepted;

[0093] In this process, the ratio of the area of ​​two adjacent dynamic signals to the total area is set to determine whether it is the same as the area in the historical data. When the same is detected, it can be determined whether the current signal is abnormal. In this process, the cosine similarity is not used in the judgment of similar areas, because in the process of judging the cosine similarity, it is necessary to first determine that the signal will not change; however, the vibration signal currently displayed is changing and not fixed, so this method is selected here to analyze the similarity of the area;

[0094] At the same time, if this method uses the area formed by a single peak value and the horizontal axis for analysis, it cannot analyze whether the degree of change of adjacent signals is consistent. Therefore, using this method to judge is more in line with the actual situation.

[0095] If it is detected that the decomposed signal does not contain the first vibration signal, obtain the position signal of the vibration sensor on the transformer, set the current position of the vibration sensor on the transformer as P, obtain the warning signal when the vibration sensor is on the transformer, and when it is detected that the peak value of the warning signal is higher than the first preset value, move the position of the vibration sensor on the transformer, and when it is detected that the moved distance makes the warning signal lower than the first preset value, mark the position of the vibration sensor after the moving distance and the characteristics of the vibration signal corresponding to the moved distance;

[0096]

[0097] Where H is the distance the vibration sensor moves on the transformer; (a v , b v ) refers to the coordinates when the vibration sensor is not moving, (a r , b r ) refers to the coordinates of the vibration sensor after it moves. When it is detected that H is greater than the second preset value, it is prompted to stop moving.

[0098] The set formed by the influence degree of the vibration sensor moving distance on the vibration signal peak value is: H l It refers to the distance that the vibration sensor moves on the transformer for the first time, c l It refers to the peak value corresponding to the first time the vibration sensor moves on the transformer;

[0099]

[0100] Z HC It refers to the multiple of the influence of the moving distance of the vibration sensor on the peak value of the vibration signal; q H Refers to the score corresponding to the moving distance of the vibration sensor, q c Refers to the score corresponding to the peak value of the vibration signal;

[0101] When Z is detectedHC =1, it means that the distance moved by the vibration sensor has a high degree of influence on the peak value of the vibration signal, and the best vibration signal is achieved;

[0102] When Z is detected HC When ≠1, it means that the distance moved by the vibration sensor has a low impact on the peak value of the vibration signal, and the optimal vibration signal has not been achieved;

[0103] The above method can be used to determine the importance of the vibration sensor's movement to the vibration signal's peak value, and determine the specific degree of change of the vibration sensor's movement on the vibration signal's peak value.

[0104] Embodiment: when it is detected that the decomposed signal does not contain the first vibration signal, the position signal of the vibration sensor on the transformer is obtained, the current position of the vibration sensor on the transformer is set to P=(100, 150), and the early warning signal when the vibration sensor is on the transformer is obtained. When it is detected that the peak value of the early warning signal is higher than the first preset value, the position of the vibration sensor on the transformer is moved, and the current position on the transformer is detected to be specifically S=(180, 200). When it is detected that the moved distance makes the early warning signal lower than the first preset value, the position of the vibration sensor after the moving distance and the characteristics of the vibration signal corresponding to the moved distance are marked; the peak value of the first preset value is specifically 80;

[0105]

[0106] The peak value of the warning signal formed by the vibration sensor on the transformer is 85, which exceeds the preset warning signal, and it is necessary to continue to move on the transformer until it is lower than the first preset value.

[0107] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0108] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online monitoring system for power transformer winding vibration, characterized in that: The system includes a parameter setting module, an error signal detection module, an error signal verification module and a signal data latch module; The parameter setting module obtains vibration signals by setting a number of vibration sensors on the transformer and the reference plane, and establishes a two-dimensional plane model to obtain the positions of the vibration sensors on the transformer; The error signal detection module analyzes the state of the transformer winding according to the difference of the vibration signal set on the transformer and the reference surface; when it is detected that the difference of the vibration signal causes the transformer winding to generate a pre-tightening force, the signal is decomposed and the characteristics of the signal are obtained; The error signal verification module compares the vibration signal difference with the vibration signal in the historical data to analyze whether the vibration signal will cause the winding to generate an early warning condition; The signal data latch module moves the vibration sensor disposed on the transformer, obtains the characteristics of the vibration signal when the vibration sensor moves to the optimal position, and encrypts and stores the characteristics of the vibration signal; The signal data latch module is connected to the parameter setting module, the error signal detection module, and the error signal verification module; Wherein, the error signal detection module includes a vibration signal difference acquisition unit, a transformer winding state unit, a vibration signal decomposition unit and a signal feature acquisition unit; The vibration signal difference acquisition unit acquires vibration signals from vibration sensors respectively arranged on the transformer and the reference plane, and determines whether the difference between the vibration signal arranged on the transformer and the vibration signal on the reference plane causes an early warning of the transformer winding; The transformer winding status unit analyzes the winding status of the transformer according to the vibration signal displayed on the transformer; The vibration signal decomposition unit, when detecting that the signal difference of the vibration sensors respectively arranged on the transformer and the reference plane causes an early warning signal of the transformer winding state, decomposes the vibration signal difference into a static vibration signal and a dynamic vibration signal; The signal feature acquisition unit acquires the features of the dynamic vibration signal and retrieves data from historical data for comparison and analysis according to the features of the dynamic vibration signal; The error signal verification module includes a similar peak feature comparison unit and a position adjustment unit; The similar peak feature comparison unit obtains the vibration signal feature, compares and analyzes the vibration signal feature with the signal feature in the historical data, and analyzes the similarity of the features according to the comparison result, so as to determine whether the decomposed signal contains the first vibration signal; The position adjustment unit, if detecting that the feature similarity is low, obtains the current position of the vibration sensor on the transformer and adjusts the position of the vibration sensor on the transformer; The signal data latch module includes a mobile signal feature extraction unit, a data mark prompt unit and a signal data encryption unit; The mobile signal feature extraction unit monitors and extracts the vibration signal feature generated when the vibration sensor moves on the transformer, and the feature is the feature when no early warning signal occurs in the transformer winding; The data marking prompting unit marks the optimal moving position of the vibration sensor on the transformer; The signal data encryption unit encrypts and stores the extracted vibration signal features.

2. The online monitoring system for power transformer winding vibration according to claim 1 is characterized in that: The parameter setting module includes a sensor setting monitoring unit, a two-dimensional model building unit, a sensor positioning unit and a vibration signal receiving unit; The sensor setting monitoring unit obtains the signal of the vibration sensor by setting a plurality of vibration sensors on the transformer and the reference surface; The two-dimensional model building unit builds a two-dimensional plane model to obtain the moving distance of the vibration sensor on the transformer; The sensor positioning unit performs real-time positioning of the moving position of the vibration sensor on the transformer; The vibration signal receiving unit receives vibration signals from the vibration sensor on the transformer and the reference surface respectively.

3. A method for online monitoring of power transformer winding vibration, characterized in that: The method comprises the following steps: A plurality of vibration sensors are respectively arranged on the transformer and the reference plane to obtain a plurality of vibration signals; Obtain transformer winding preload and generate monitoring and early warning signals; Set up a two-dimensional plane model and locate the real-time position of the vibration sensor to obtain the positioning information of the vibration sensor; Obtain the difference between the signal amplitude of the vibration sensor placed on the transformer and the signal amplitude of the vibration sensor on the reference surface. If the difference in signal amplitude causes the transformer winding preload to reach the warning state, the difference in signal amplitude contains a signal error, and decompose the vibration signal to obtain a continuous time period T = {t1, t2, t3, ..., t n }, the peak information of the dynamic signal in different time periods is extracted as W = {w1,w2,w3...w n }, n refers to the number of time items, w n It refers to the peak value of the nth time period, and obtains the same signal as the peak signal; Get dynamic signal j With adjacent dynamic signal t j+1 The horizontal and vertical coordinates of the peak value; According to the formula: Among them, RF(t j ,t j+1 ) refers to the ratio of the sum of the two dynamic signal areas to the total area, and f(x) refers to the function of the dynamic signal. When RF(t j ,t j+1 ) and the same peak signal is less than the first error, it indicates that the dynamic signal is highly similar to the same peak signal, and the decomposed signal contains the first vibration signal; If RF(t j ,t j+1 ) when the ratio error between the dynamic signal and the same peak signal is greater than the first error, it indicates that the dynamic signal is less similar to the same peak signal, and other coordinate signals in the dynamic signal are selected and intercepted; If the difference in signal amplitudes does not cause the transformer winding preload to reach a warning state, the difference in signal amplitudes is a transformer vibration signal; Obtain the best vibration signal when the vibration sensor is at the best position of the transformer, extract the vibration signal characteristics, and encrypt the vibration signal characteristic data; If it is detected that the decomposed signal does not contain the first vibration signal, obtain the position signal of the vibration sensor on the transformer, set the current position of the vibration sensor on the transformer as P, obtain the warning signal when the vibration sensor is on the transformer, and when it is detected that the peak value of the warning signal is higher than the first preset value, move the position of the vibration sensor on the transformer, and when it is detected that the moved distance makes the warning signal lower than the first preset value, mark the position of the vibration sensor after the moving distance and the characteristics of the vibration signal corresponding to the moved distance; Where H is the distance the vibration sensor moves on the transformer; (a v , b v ) refers to the coordinates when the vibration sensor is not moving, (a r , b r ) refers to the coordinates of the vibration sensor after it moves. When it is detected that H is greater than the second preset value, it is prompted to stop moving; Among them, the set formed by the influence of the vibration sensor moving distance on the vibration signal peak value is: H l It refers to the distance that the vibration sensor moves on the transformer for the first time, c l It refers to the peak value corresponding to the first time the vibration sensor moves on the transformer; Z HC It refers to the multiple of the influence of the moving distance of the vibration sensor on the peak value of the vibration signal; q H Refers to the score corresponding to the moving distance of the vibration sensor, q c Refers to the score corresponding to the peak value of the vibration signal; When Z is detected HC =1, it means that the distance moved by the vibration sensor has a high degree of influence on the peak value of the vibration signal, and the best vibration signal is achieved; When Z is detected HC When ≠1, it means that the distance moved by the vibration sensor has a low impact on the peak value of the vibration signal and the optimal vibration signal is not achieved.

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