Electric reactor vibration and partial discharge monitoring system

Abstract

The invention provides a reactor vibration and partial discharge monitoring system, which relates to the technical field of reactors and comprises a sensor array module, a data processing module, a wireless transmission module and a power supply module. By arranging the distributed sensor array module, comprehensive monitoring of different positions of the annular oil duct of the electric reactor is achieved, the monitoring coverage range is enlarged, the dynamic compensation function of the data processing module can reduce the influence of temperature on monitoring data, the accuracy of gas concentration reading and ultrasonic propagation speed is improved, and the monitoring accuracy is improved. Therefore, the reliability of the oil sample degradation early warning signal and the positioning precision of the partial discharge point are ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric reactors, and particularly relates to an electric reactor vibration and partial discharge monitoring system. BACKGROUND

[0002] During the operation of an electric reactor, the core and winding inside the electric reactor will vibrate due to electromagnetic force, temperature change and other factors, and partial discharge may occur due to insulation aging, local electric field concentration and other problems, which will affect the operation stability and service life of the electric reactor, and even cause equipment failure in severe cases. At present, the traditional electric reactor monitoring method has many deficiencies, for example, the vibration and partial discharge are monitored separately, it is difficult to realize the collaborative analysis of the two, the monitoring data is easily affected by temperature, resulting in drift errors of gas concentration readings, ultrasonic propagation speed and the like, affecting the monitoring accuracy, the positioning accuracy of the partial discharge point is low, it is difficult to accurately lock the fault position, and there is a lack of correlation analysis of the vibration and discharge characteristics, so that potential faults such as core loosening and winding deformation cannot be identified in time, and it is also difficult to give a targeted predictive maintenance scheme based on the monitoring data, which restricts the effectiveness of the electric reactor monitoring and the scientificity of the equipment operation and maintenance. SUMMARY

[0003] The application provides an electric reactor vibration and partial discharge monitoring system to solve at least one of the above technical problems.

[0004] To solve the above technical problems, the application discloses an electric reactor vibration and partial discharge monitoring system, which comprises: A sensor array module is axially distributed along the annular oil channel between the core and winding of the electric reactor, and a set of three-way sensor units is arranged at every preset distance. A data processing module is arranged on the outer wall of the oil tank of the electric reactor and connected to the sensor array module through a shielding cable, the data processing module is used to dynamically compensate the drift errors of the gas concentration readings and ultrasonic propagation speed based on the temperature data collected by the three-way sensor units, real-time compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold, generate an oil sample degradation warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. A wireless transmission module and a power supply module, the wireless transmission module is electrically connected to the data processing module, and the power supply module is used to supply power to the sensor array module, the data processing module and the wireless transmission module.

[0005] Preferably, each set of three-way sensor units comprises: One fiber Bragg grating temperature sensor is used to monitor the local temperature of the insulating oil and provide original data for temperature compensation. A miniature dissolved gas sensor is used to detect the concentration of acetylene and hydrogen in insulating oil in real time. Three ultrasonic sensors are distributed in an equilateral triangle with a spacing of 10 cm and are used to receive ultrasonic signals generated by partial discharge.

[0006] Preferably, the data processing module comprises: A temperature compensation unit is used to dynamically compensate the original concentration of the miniature dissolved gas sensor and the propagation speed of ultrasonic waves in the oil medium based on the local temperature monitored by the fiber Bragg grating temperature sensor. A gas concentration analysis unit is used to generate an oil sample degradation warning signal based on the compensated dissolved gas concentration output by the temperature compensation unit and the preset dissolved gas concentration threshold. A time difference positioning unit is used to calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit.

[0007] Preferably, the generation of the oil sample degradation warning signal based on the compensated dissolved gas concentration output by the temperature compensation unit and the preset dissolved gas concentration threshold comprises: Reading the real-time concentration value of the miniature dissolved gas sensor output by the temperature compensation unit to obtain the compensated acetylene concentration and the compensated hydrogen concentration; If the compensated acetylene concentration is greater than the preset acetylene concentration threshold, an arc discharge warning signal is generated; If the compensated hydrogen concentration is greater than the preset hydrogen concentration threshold, an insulation overheating warning signal is generated; The arc discharge warning signal and the insulation overheating warning signal and the corresponding excessive gas type are output through the wireless transmission module.

[0008] Preferably, the calculation of the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit comprises: Measuring the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit 、 and ; wherein, is the time difference between ultrasonic sensor and ultrasonic sensor , is the time at which ultrasonic sensor receives the signal, is the time at which ultrasonic sensor receives the signal; ​ ; wherein, is an ultrasonic sensor and an ultrasonic sensor between the ultrasonic sensors, is an ultrasonic sensor the time at which the signal is received; in a rectangular coordinate system with the first ultrasonic sensor as the origin (0, 0, 0), the second ultrasonic sensor located at (0, 0, 0) and the third ultrasonic sensor located at (0, 0, 0), solving the discharge point satisfies the hyperbolic equation group, the coordinate value of the discharge point is obtained, and then the coordinate value of the discharge point is output.

[0009] Preferably, the hyperbolic equation group is: ; wherein, are the x-axis, y-axis and z-axis coordinate values of the discharge point, is the x-axis coordinate value of the second ultrasonic sensor, is the x-axis coordinate value of the third ultrasonic sensor, is the y-axis coordinate value of the third ultrasonic sensor, is the temperature-compensated sound velocity.

[0010] Preferably, based on the local temperature monitored by the fiber grating temperature sensor, the original concentration of the micro dissolved gas sensor and the propagation velocity of the ultrasonic wave in the oil medium are dynamically compensated, including: using the sound velocity-temperature formula to correct the input sound velocity of the time difference positioning unit: ; wherein, is the temperature-compensated sound velocity, is the original propagation velocity of the ultrasonic wave, is the sound velocity temperature coefficient, indicating the relative change rate of the sound velocity with temperature, is the local temperature of the insulating oil detected by the fiber grating temperature sensor, is the sound velocity calibration standard temperature; temperature drift correction is performed on the output value of the dissolved gas sensor: ; wherein, is the temperature-compensated gas concentration, is the original concentration reading directly output by the dissolved gas sensor, including acetylene concentration or hydrogen concentration, ​​​​​is the temperature coefficient of gas solubility, including the temperature coefficient of acetylene solubility or the temperature coefficient of hydrogen solubility, the value depends on the type of gas, is the reference temperature of acetylene or hydrogen gas concentration.

[0011] Preferably, it also includes a vibration discharge coupling analysis module, which includes: a vibration feature extraction unit for separating the mechanical vibration component from the broadband signal received by the ultrasonic sensor, calculating the vibration energy integral value ; a discharge feature extraction unit for counting the amplitude-phase distribution of partial discharge pulses, outputting the maximum discharge amount and the discharge repetition rate N; a fault correlation decision unit for generating an iron core loose fault code when and the discharge point is located on the surface of the iron core; generating a winding deformation fault code when and the vibration energy is concentrated at 50Hz; outputting the fault code and positioning coordinates through the wireless transmission module.

[0012] Preferably, it also includes a predictive maintenance decision module, which includes: a three-dimensional mapping unit for constructing an electric reactor point cloud model, mapping the discharge point coordinate value to the electric reactor point cloud model space; a fault evolution analysis unit for inputting the compensated acetylene concentration change rate and the discharge amount growth rate, calculating the insulation deterioration index: ; wherein, is the insulation deterioration index, is the compensated acetylene concentration change rate, is the discharge amount growth rate, and are the acetylene concentration weight coefficient and the discharge amount weight coefficient, respectively; a maintenance decision unit for outputting a maintenance scheme when , wherein is the insulation deterioration index threshold, the maintenance scheme includes: if the discharge point is located in the winding area, the maintenance scheme is to tighten the press nails and perform insulation reinforcement treatment; if the discharge point is located in the iron yoke area, the maintenance scheme is to reinforce the laminations and adjust the magnetic shunt.

[0013] Preferably, each group of three-way sensor unit in the sensor array module is packaged in an explosion-proof metal shell, a flow guide groove is formed on the surface of the shell, the shell is clamped on the surface of the reactor core support strip through an annular fixing belt, and a 0.5mm gap is reserved between the outer wall of the shell and the inner wall of the annular oil channel.

[0014] Compared with the prior art, the present application has the following beneficial effects: The present application realizes comprehensive monitoring of different positions of the reactor annular oil channel by arranging the distributed sensor array module, improves the monitoring coverage, the dynamic compensation function of the data processing module can reduce the influence of temperature on the monitoring data, improves the accuracy of gas concentration reading and ultrasonic wave propagation speed, and further ensures the reliability of the oil sample degradation early warning signal and the accuracy of the local discharge point positioning, the wireless transmission module realizes remote transmission of the monitoring data, which is convenient for the staff to master the equipment state in real time, the power supply module stably supplies power to each module, and ensures the continuous operation of the system, and the explosion-proof metal shell design and installation mode of the three-way sensor unit not only ensure the safe operation of the sensor, but also reduce the influence on the flow of the insulating oil in the oil channel, and the whole realizes integrated and high-precision monitoring of the reactor vibration and local discharge. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and explain the present application, and do not constitute a limitation of the present application. In the drawings: Figure 1 It is an schematic diagram of the reactor vibration and local discharge monitoring system of the present application. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present application will be described below in conjunction with the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and do not limit the present application.

[0017] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and does not mean to specially indicate the order or sequence, nor to limit the present application, which is only to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears to be contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the scope of protection required by the present application.

[0018] The present application provides the following embodiments Embodiment 1 The embodiment of the present application provides a kind of electric reactor vibration and partial discharge monitoring system, as shown in Figure 1 Sensor array module is distributed along the annular oil channel between the core of electric reactor and winding, and a set of three-way sensor unit is arranged every interval preset distance; Data processing module is arranged on the outer wall of the oil tank of electric reactor, and is connected with the sensor array module by shielding cable, and the data processing module is used to dynamically compensate the drift error of gas concentration reading and ultrasonic propagation speed based on the temperature data collected by three-way sensor unit, then real-time compares the dissolved gas concentration after compensation with preset dissolved gas concentration threshold, generates oil sample deterioration early warning signal, and calculates the three-dimensional coordinates of partial discharge point based on the compensated ultrasonic propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. Wireless transmission module and power supply module, wireless transmission module is electrically connected with data processing module, and power supply module is used to power sensor array module, data processing module and wireless transmission module.

[0019] Preferably, each set of three-way sensor unit in sensor array module is packaged in explosion-proof metal shell, flow guide groove is opened on the surface of shell, shell is clamped on the surface of core strut of electric reactor through annular fixing band, and 0.5mm gap is reserved between the outer wall of shell and the inner wall of annular oil channel.

[0020] The working principle and beneficial effects of the above technical solution are as follows: sensor array module is distributed along the annular oil channel between the core of electric reactor and winding, and a set of three-way sensor unit is arranged every interval preset distance, for collecting relevant monitoring data, data processing module is arranged on the outer wall of the oil tank of electric reactor, and is connected with the sensor array module by shielding cable, and it is based on the temperature data collected by three-way sensor unit to dynamically compensate the drift error of gas concentration reading and ultrasonic propagation speed, then real-time compares the dissolved gas concentration after compensation with preset threshold, generates oil sample deterioration early warning signal, and calculates the three-dimensional coordinates of partial discharge point based on the compensated ultrasonic propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit, wireless transmission module is electrically connected with data processing module, for transmitting relevant signals, power supply module is used to power sensor array module, data processing module and wireless transmission module, meanwhile, each set of three-way sensor unit is packaged in explosion-proof metal shell, flow guide groove is opened on the surface of shell, and shell is clamped on the surface of core strut of electric reactor through annular fixing band, and 0.5mm gap is reserved between the outer wall of shell and the inner wall of annular oil channel. ​The application realizes comprehensive monitoring of different positions of the oil duct of the electric reactor by arranging the distributed sensor array module, improves the monitoring coverage, the dynamic compensation function of the data processing module can reduce the influence of temperature on the monitoring data, improves the accuracy of the gas concentration reading and the ultrasonic wave propagation speed, and further ensures the reliability of the oil sample deterioration early warning signal and the accuracy of the partial discharge point positioning, the wireless transmission module realizes remote transmission of the monitoring data, which is convenient for the staff to master the equipment state in real time, the power supply module stably supplies power for each module, and ensures the continuous operation of the system, and the explosion-proof metal shell design and installation mode of the three-way sensor unit not only ensure the safe operation of the sensor, but also reduce the influence on the flow of the insulating oil in the oil duct, and the whole realizes integrated and high-precision monitoring of the vibration and partial discharge of the electric reactor.

[0021] Embodiment 2 On the basis of embodiment 1, each group of three-way sensor unit comprises: one fiber grating temperature sensor for monitoring the local temperature of the insulating oil to provide original data for temperature compensation; one micro dissolved gas sensor for real-time detection of the concentration of acetylene and hydrogen in the insulating oil; three ultrasonic sensors distributed in an equilateral triangle and spaced 10 cm apart for receiving ultrasonic signals generated by partial discharge.

[0022] The working principle and beneficial effects of the above technical solution are as follows: each group of three-way sensor unit comprises one fiber grating temperature sensor, one micro dissolved gas sensor and three ultrasonic sensors, wherein the fiber grating temperature sensor is used to monitor the local temperature of the insulating oil to provide original data for subsequent temperature compensation, the micro dissolved gas sensor is used to real-time detect the concentration of acetylene and hydrogen in the insulating oil, and the three ultrasonic sensors are distributed in an equilateral triangle and spaced 10 cm apart for receiving ultrasonic signals generated by partial discharge. The application integrates three different types of sensors in each group of three-way sensor unit, realizes synchronous acquisition of temperature, dissolved gas concentration and ultrasonic signals, lays a foundation for multi-parameter collaborative monitoring, the fiber grating temperature sensor can accurately obtain local temperature data to provide a reliable basis for temperature compensation, the micro dissolved gas sensor can real-time monitor the concentration of acetylene and hydrogen sensitive to electric reactor faults, which is convenient for timely finding insulation abnormalities, the three ultrasonic sensors distributed in an equilateral triangle can realize positioning of the partial discharge point through the time difference of the received signals, and the 10 cm spacing design takes into account the positioning accuracy and the rationality of the sensor layout, and improves the effectiveness of ultrasonic signal reception.

[0023] Embodiment 3 On the basis of embodiment 2, the data processing module comprises: A temperature compensation unit is configured to dynamically compensate original concentration of the micro dissolved gas sensor and propagation speed of the ultrasonic wave in the oil medium based on local temperature monitored by the fiber grating temperature sensor; A gas concentration analysis unit is configured to generate an oil sample degradation early warning signal based on the compensated dissolved gas concentration output by the temperature compensation unit and a preset dissolved gas concentration threshold value. A time difference positioning unit is configured to calculate three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit.

[0024] The working principle and beneficial effects of the above technical solution are as follows: The data processing module includes a temperature compensation unit, a gas concentration analysis unit, and a time difference positioning unit. The temperature compensation unit dynamically compensates the original concentration of the micro dissolved gas sensor and the propagation speed of the ultrasonic wave in the oil medium based on the local temperature monitored by the fiber grating temperature sensor. The gas concentration analysis unit compares the compensated dissolved gas concentration output by the temperature compensation unit with the preset dissolved gas concentration threshold value to generate an oil sample degradation early warning signal. The time difference positioning unit calculates the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The present application divides the data processing module into three functional units, realizes professional processing of monitoring data, dynamically compensates the influence of temperature on gas concentration and ultrasonic wave propagation speed by the temperature compensation unit, effectively eliminates temperature drift error, improves the accuracy of data, generates an early warning signal based on the compensated concentration data by the gas concentration analysis unit, makes the oil sample degradation early warning more reliable, can timely reflect the insulation state of the reactor, calculates the discharge point coordinates by the time difference positioning unit using the compensated ultrasonic wave propagation speed and signal time difference, improves the positioning accuracy of the partial discharge point, and ensures the systematicness and scientificity of data processing through the cooperative work of the three units, providing accurate data support for reactor fault monitoring.

[0025] Embodiment 4 Based on the compensated dissolved gas concentration output by the temperature compensation unit and the preset dissolved gas concentration threshold value, an oil sample degradation early warning signal is generated, including: Reading the real-time concentration value of the micro dissolved gas sensor output by the temperature compensation unit to obtain the compensated acetylene concentration and the compensated hydrogen concentration; If the compensated acetylene concentration is greater than the preset acetylene concentration threshold value, an arc discharge early warning signal is generated; If the compensated hydrogen concentration is greater than the preset hydrogen concentration threshold value, an insulation overheating early warning signal is generated; The arc discharge early warning signal and the insulation overheating early warning signal and the corresponding excessive gas type are output through the wireless transmission module.

[0026] The working principle and beneficial effects of the technical solution are as follows: the process of generating the oil sample degradation early warning signal based on the compensated dissolved gas concentration output by the temperature compensation unit and the preset dissolved gas concentration threshold value is as follows: first, the real-time concentration value of the micro dissolved gas sensor output by the temperature compensation unit is read to obtain the compensated acetylene concentration and the compensated hydrogen concentration; if the compensated acetylene concentration is greater than the preset acetylene concentration threshold value, an arc discharge early warning signal is generated; if the compensated hydrogen concentration is greater than the preset hydrogen concentration threshold value, an insulation overheating early warning signal is generated; finally, the arc discharge early warning signal, the insulation overheating early warning signal and the corresponding excessive gas type are output through the wireless transmission module. The generation logic of the oil sample degradation early warning signal is determined, acetylene and hydrogen concentrations are monitored and compared with preset threshold values, arc discharge and insulation overheating, two different types of faults, can be accurately identified, wherein acetylene concentration exceeding the standard corresponds to arc discharge, and hydrogen concentration exceeding the standard corresponds to insulation overheating; this classified early warning method enables workers to quickly judge the nature of the fault and facilitate the adoption of targeted treatment measures; meanwhile, the early warning signal and the excessive gas type are output through the wireless transmission module, realizing timely transmission of fault information, improving the efficiency of fault response and reducing the risk of fault expansion.

[0027] Example 5 Based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit, the three-dimensional coordinates of the partial discharge point are calculated, including: The time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit is measured. 、 and The time difference between ultrasonic sensor ; wherein, is the time difference between ultrasonic sensor and ultrasonic sensor , is the time when ultrasonic sensor receives the signal, is the time when ultrasonic sensor receives the signal. ; wherein, is the time difference between ultrasonic sensor and ultrasonic sensor , is the time when ultrasonic sensor receives the signal. In a rectangular coordinate system with the first ultrasonic sensor as the origin (0, 0, 0), the second ultrasonic sensor located at ( , 0, 0) and the third ultrasonic sensor located at ( , , 0), the discharge point satisfies the hyperbolic equation group, the discharge point coordinate value is obtained, and then the discharge point coordinate value is outputted; Hyperbolic equation group: ; wherein, x-axis, y-axis and z-axis coordinate values of the discharge point respectively, x-axis coordinate value of the second ultrasonic sensor, x-axis coordinate value of the third ultrasonic sensor, y-axis coordinate value of the third ultrasonic sensor, sound speed after temperature compensation.

[0028] The working principle and beneficial effects of the above technical scheme are as follows: the present application calculates the time difference of signals received by three ultrasonic sensors, and combines the established rectangular coordinate system and hyperbolic equation group to solve the three-dimensional coordinates of the partial discharge point, so as to realize accurate positioning of the discharge point. The algorithm logic is scientific, the equation group is constructed by using the relationship between ultrasonic propagation time difference and distance, the discharge point position can be accurately back calculated, the temperature compensation sound speed is combined, the influence of temperature on ultrasonic propagation speed is further reduced, the positioning accuracy is improved, this positioning method can quickly lock the fault position, provides accurate guidance for troubleshooting and fault handling for workers, helps to shorten the fault handling time and reduce the equipment operation and maintenance cost.

[0029] Example 6 On the basis of example 3, based on the local temperature monitored by the fiber grating temperature sensor, the original concentration of the micro dissolved gas sensor and the propagation speed of ultrasonic wave in oil medium are dynamically compensated, including: The sound speed-temperature formula is used to correct the input sound speed of the time difference positioning unit: ; wherein, is the sound speed after temperature compensation, is the original propagation speed of ultrasonic wave, is the sound speed temperature coefficient, which represents the relative change rate of sound speed with temperature, is the local temperature of insulating oil detected by the fiber grating temperature sensor, is the sound speed calibration standard temperature; Temperature drift correction is performed on the dissolved gas sensor output value: ; wherein, is the temperature-compensated gas concentration, is the original concentration reading directly output by the dissolved gas sensor, including acetylene concentration or hydrogen concentration, is the gas solubility temperature coefficient, including acetylene solubility temperature coefficient or hydrogen solubility temperature coefficient, the value of which depends on the type of gas, is the acetylene or hydrogen gas concentration reference temperature.

[0030] The working principle and beneficial effects of the above technical solution are: by establishing a scientific temperature compensation formula, the influence of temperature on the ultrasonic wave propagation speed and dissolved gas concentration monitoring is effectively eliminated, the correction is based on the linear change law of sound speed with temperature, the logic is clear, and the influence of temperature on sound speed can be accurately reflected, the gas concentration compensation adopts an exponential formula which conforms to the exponential law of gas solubility with temperature change, and the gas concentration reading at different temperatures can be accurately corrected, both compensation methods are based on measured temperature data, and are targeted, which significantly improves the reliability of sound speed and gas concentration data, and provides accurate basic data for subsequent partial discharge positioning and oil sample degradation warning.

[0031] Embodiment 7 On the basis of embodiment 1, further comprising a vibration-discharge coupling analysis module, the vibration-discharge coupling analysis module comprising: a vibration feature extraction unit, configured to separate a mechanical vibration component from a broadband signal received by the ultrasonic sensor, and calculate a vibration energy integral value ; a discharge feature extraction unit, configured to count an amplitude-phase distribution of partial discharge pulses, and output a maximum discharge amount and a discharge repetition rate N; a fault correlation decision unit, configured to generate an iron core loosening fault code when and the discharge point is located on the surface of the iron core; generate a winding deformation fault code when and the vibration energy is concentrated at 50 Hz; output the fault code and the positioning coordinates through a wireless transmission module.

[0032] The working principle and beneficial effects of the above technical solution are: the vibration-discharge coupling analysis module comprises a vibration feature extraction unit, a discharge feature extraction unit and a fault correlation decision unit, the vibration feature extraction unit separates a mechanical vibration component from a broadband signal received by the ultrasonic sensor, and calculates a vibration energy integral value, the discharge feature extraction unit counts an amplitude-phase distribution of partial discharge pulses, and outputs a maximum discharge amount and a discharge repetition rate, and the fault correlation decision unit performs correlation analysis according to the monitoring data, when and the discharge point is located on the surface of the iron core, a loose iron core fault code is generated; When and the vibration energy is concentrated at 50Hz, a winding deformation fault code is generated; The fault code and the positioning coordinates are output through the wireless transmission module; The vibration and partial discharge characteristics are analyzed by the vibration-discharge coupling analysis module, breaking through the limitations of traditional separate monitoring. The vibration characteristic extraction unit separates the mechanical vibration component and calculates , the vibration intensity can be quantified, the discharge characteristic extraction unit counts and N, which can reflect the severity of the discharge. The fault correlation decision unit can accurately identify potential faults such as loose iron core and winding deformation based on the correlation conditions of vibration and discharge characteristics. This correlation analysis method improves the accuracy and pertinence of fault diagnosis, and can timely discover the structural abnormalities inside the equipment, providing an effective basis for preventing equipment failure.

[0033] Embodiment 8 Based on embodiment 1, it further includes a predictive maintenance decision module, which includes: A three-dimensional mapping unit is used to construct a reactor point cloud model, and the discharge point coordinate value is mapped to the reactor point cloud model space; A fault evolution analysis unit is used to input the compensated acetylene concentration change rate and the discharge amount growth rate, and calculate the insulation deterioration index: ; wherein, is the insulation deterioration index, is the compensated acetylene concentration change rate, is the discharge amount growth rate, and are the acetylene concentration weight coefficient and the discharge amount weight coefficient, respectively; A maintenance decision unit is used to output a maintenance scheme when , wherein is the insulation deterioration index threshold value, and the maintenance scheme includes: If the discharge point is located in the winding area, the maintenance scheme is to tighten the press nails and perform insulation reinforcement treatment; If the discharge point is located in the iron yoke area, the maintenance scheme is to reinforce the laminations and adjust the magnetic shunt.

[0034] The working principle and beneficial effects of the technical solution are as follows: the predictive maintenance decision module realizes forward-looking maintenance planning based on monitoring data; the three-dimensional mapping unit maps the discharge point coordinates to the reactor point cloud model, so that the fault position can be intuitively displayed; the fault evolution analysis unit calculates the insulation deterioration index through a formula, comprehensively considers the change rate of acetylene concentration and the growth rate of discharge capacity, and quantifies the insulation deterioration degree, which is logical and scientific, and the setting of the weight coefficients and can reflect the influence degree of different parameters on insulation deterioration; the maintenance decision unit gives a targeted maintenance scheme according to the comparison of and the fault position, so that the maintenance work is more targeted and predictable, which helps to prevent equipment failure in advance, prolongs the service life of the reactor, and reduces the loss caused by sudden failure.

[0035] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A reactor vibration and partial discharge monitoring system, characterized in that: The application relates to a sensor array module, a data processing module, a wireless transmission module and a power supply module. The sensor array module comprises a plurality of three-way sensor units arranged at intervals along the annular oil channel between the core and the winding of the reactor. The data processing module is arranged on the outer wall of the oil tank of the reactor and is connected to the sensor array module through a shielding cable. The wireless transmission module is electrically connected to the data processing module.

2. The system of claim 1, wherein: Each three-way sensor unit comprises one fiber grating temperature sensor, one micro dissolved gas sensor and three ultrasonic sensors. The data processing module comprises a temperature compensation unit, a gas concentration analysis unit and a time difference positioning unit. The temperature compensation unit is used for dynamically compensating the original concentration of the micro dissolved gas sensor and the propagation speed of the ultrasonic wave in the oil medium based on the local temperature monitored by the fiber grating temperature sensor. The gas concentration analysis unit is used for generating an oil sample degradation early warning signal based on the compensated dissolved gas concentration output by the temperature compensation unit and the preset dissolved gas concentration threshold.

3. The system of claim 2, wherein: The time difference positioning unit is used for calculating the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed output by the temperature compensation unit and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit.

4. The system of claim 3, wherein the system further comprises a vibration sensor. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit.

5. The system of claim 3, wherein the system further comprises: a vibration sensor configured to measure vibration of the reactor; and a vibration analyzer configured to analyze the vibration of the reactor. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. Measuring three ultrasonic sensors in one triad sensor unit 、 and time difference of signal reception: ; wherein is the time difference between the ultrasonic sensor and the ultrasonic sensor , is the time the signal was received by the ultrasonic sensor , is the time the signal was received by the ultrasonic sensor ; ; wherein is the time difference between the ultrasonic sensor and the ultrasonic sensor , is the time the ultrasonic sensor received the signal; In a rectangular coordinate system with the first ultrasonic sensor as the origin (0, 0, 0), the second ultrasonic sensor at ( , 0, 0), and the third ultrasonic sensor at ( , , 0), the discharge point is solved to satisfy a hyperboloid equation set, the discharge point coordinate value is obtained, and then the discharge point coordinate value is output.

6. The system of claim 5, wherein: The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. ; wherein, are x-axis, y-axis and z-axis coordinate values of the discharge point, respectively, is an x-axis coordinate value of the second ultrasonic sensor, is an x-axis coordinate value of the third ultrasonic sensor, is a coordinate value of the y-axis of the third ultrasonic sensor, is a temperature-compensated sound speed.

7. The system of claim 3, wherein the system further comprises: a vibration sensor configured to measure vibration of the reactor; and a vibration analyzer configured to analyze the vibration of the reactor. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. ; wherein, is the temperature-compensated sound velocity, is the original propagation speed of the ultrasonic wave, is the sound velocity temperature coefficient, indicating the relative change rate of the sound velocity with temperature, is the local temperature of the insulating oil detected by the fiber grating temperature sensor, is the sound velocity calibration standard temperature; The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of the partial discharge point based on the compensated ultrasonic wave propagation speed and the time difference of the signals received by the three ultrasonic sensors in the same three-way sensor unit. The application can compensate the drift error of the gas concentration reading and the ultrasonic wave propagation speed based on the temperature data collected by the three-way sensor unit, compare the compensated dissolved gas concentration with the preset dissolved gas concentration threshold in real time, generate an oil sample degradation early warning signal, and calculate the three-dimensional coordinates of ; wherein, is the temperature compensated gas concentration, is the raw concentration reading output directly from the dissolved gas sensor, including acetylene concentration or hydrogen concentration, is the gas solubility temperature coefficient, including acetylene solubility temperature coefficient or hydrogen solubility temperature coefficient, taking values depending on the gas type, is the acetylene or hydrogen gas concentration reference temperature.

8. The system of claim 1, wherein: The vibration discharge coupling analysis module comprises: a vibration feature extraction unit for separating a mechanical vibration component from a broadband signal received from the ultrasonic sensor, calculating a vibration energy integral value ; The discharge feature extraction unit is configured to count the amplitude-phase distribution of the partial discharge pulses and output a maximum discharge quantity and a discharge repetition rate N. a fault correlation decision unit, configured to determine, when and the discharge point is located on the surface of the iron core, generate an iron core looseness fault code; When and the vibration energy is concentrated at 50 Hz, a winding deformation fault code is generated; The fault code and the positioning coordinates are output through the wireless transmission module.

9. The system of claim 1, wherein: The predictive maintenance decision module comprises: a three-dimensional mapping unit for constructing a reactor point cloud model, mapping the discharge point coordinate values to the reactor point cloud model space; The fault evolution analysis unit is used for inputting the compensated acetylene concentration change rate and the discharge amount growth rate, and calculating an insulation deterioration index: ; wherein, is an insulation deterioration index, is a compensated acetylene concentration change rate, is a discharge amount growth rate, and are an acetylene concentration weight coefficient and a discharge amount weight coefficient, respectively; a maintenance decision unit for outputting a maintenance plan when the insulation deterioration index is equal to or greater than the threshold value, wherein the maintenance plan includes If the discharge point is located in the winding area, the maintenance scheme is to tighten the press nails and to perform insulation reinforcement treatment. If the discharge point is located in the iron yoke area, the maintenance scheme is to perform lamination reinforcement and magnetic shunt adjustment.

10. The system of claim 1, wherein: Each group of three-way sensor units in the sensor array module is packaged in an explosion-proof metal shell, a flow guide groove is formed on the surface of the shell, the shell is clamped on the surface of the reactor iron core support strip through an annular fixing belt, and a 0.5mm gap is reserved between the outer wall of the shell and the inner wall of the annular oil channel.

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