CN210834114U - Transformer on-load tap changer diagnostic system - Google Patents
Transformer on-load tap changer diagnostic system Download PDFInfo
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- CN210834114U CN210834114U CN201921621441.8U CN201921621441U CN210834114U CN 210834114 U CN210834114 U CN 210834114U CN 201921621441 U CN201921621441 U CN 201921621441U CN 210834114 U CN210834114 U CN 210834114U
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Abstract
The utility model relates to a transformer on-load tap changer diagnostic system. The diagnostic system includes: the vibration acquisition device is arranged on the outer wall of the transformer and used for acquiring a vibration signal of the on-load tap changer; the signal processing device is connected with the vibration acquisition device and used for processing the vibration signal and outputting the processed vibration signal; and the diagnosis device is connected with the signal processing device and is used for extracting the characteristics of the time domain and the frequency domain of the processed vibration signal and comparing the extracted characteristics with preset standard characteristics so as to analyze the mechanical characteristics of the on-load tap changer. According to the method and the device, the accurate on-load tap changer vibration signal can be obtained under the condition that the vibration signal does not go deep into the transformer, meanwhile, the time domain and the frequency domain of the vibration signal are analyzed, and compared with a traditional on-load tap changer diagnosis system based on the vibration signal, the accuracy and the reliability of an analysis result can be improved.
Description
Technical Field
The utility model relates to a power equipment technical field especially relates to a transformer on-load tap changer diagnostic system.
Background
The on-load tap changer of the transformer is the only movable key component in the power transformer, and the operation state of the equipment is related to the reliable operation of the power transformer and even the whole power grid system. According to the statistical result, the abnormal operation of the on-load tap changer is one of the main reasons of accidents of the power transformer, wherein the mechanical fault accounts for more than 70% of the switch fault. Therefore, it is necessary to perform real-time monitoring and diagnosis on the mechanical characteristics of the on-load tap changer of the transformer, which is beneficial to timely judging the mechanical state of the switch and guaranteeing the safety of equipment and the reliable operation of a power grid.
At present, the on-load tap changer detection device of the transformer mostly takes traditional constant detection as main points, such as temperature, oil pressure and the like. Because one-time operation of the on-load tap changer of the transformer comprises a series of action events, collision friction and the like of a selector and a commutator contact are accompanied with generation of mechanical vibration signals, vibration is transmitted to the outer wall of the transformer through media such as transformer oil, and can be captured through a sensor arranged on the outer wall of the transformer, so that the on-off mechanical state is detected and diagnosed. However, the existing on-load tap changer diagnosis system based on vibration signals has the problems of low diagnosis accuracy and reliability.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a transformer on-load tap changer diagnostic system.
A transformer on-load tap changer diagnostic system, the diagnostic system comprising:
the vibration acquisition device is arranged on the outer wall of the transformer and used for acquiring a vibration signal of the on-load tap changer;
the signal processing device is connected with the vibration acquisition device and used for processing the vibration signal and outputting the processed vibration signal;
and the diagnosis device is connected with the signal processing device and is used for extracting the characteristics of the time domain and the frequency domain of the processed vibration signal and comparing the extracted characteristics with preset standard characteristics so as to analyze the mechanical characteristics of the on-load tap changer.
In one embodiment, the diagnostic system further comprises:
the vibration acquisition triggering module is arranged on a driving motor of the on-load voltage regulating switch and used for acquiring a triggering signal when the driving motor is started; the vibration signal of the on-load voltage regulation switch collected by the vibration collection device is the vibration signal which starts to be collected after the trigger signal is received.
In one embodiment, the vibration acquisition triggering module comprises a current sensor and a rotation angle sensor;
the current sensor is electrically connected with the driving motor and used for acquiring a current signal of the driving motor;
the rotation angle sensor is coaxially arranged with a rotation shaft of the driving motor and is used for acquiring a rotation angle signal of the driving motor; the trigger signal includes the current signal and the rotation angle signal.
In one embodiment, the vibration acquisition device comprises a vibration sensor, and the vibration sensor adopts a piezoelectric acceleration sensor.
In one embodiment, the signal processing device comprises a signal conditioning circuit, an analog-to-digital conversion circuit and a processing unit;
the signal conditioning circuit is connected with the vibration acquisition device and is used for conditioning and filtering the vibration signals;
the analog-to-digital conversion circuit is connected with the signal conditioning circuit and is used for converting the conditioned analog signal into a digital signal;
the processing unit is connected with the analog-to-digital conversion circuit and used for analyzing the digital signals.
In one embodiment, the diagnostic system further includes an input device connected to the processing unit, and configured to display an analysis result of the processing unit and receive an operation instruction made by a user on the analysis result.
In one embodiment, the input device includes a display unit and a keyboard; the display unit is used for displaying the analysis result of the processing unit; the keyboard is used for receiving an operation instruction made by a user on the analysis result.
In one embodiment, the diagnostic apparatus includes an analysis module, which is in communication connection with the processing unit, and is configured to extract a time domain characteristic quantity and a frequency domain characteristic quantity from the vibration signal, and compare a waveform formed by the extracted characteristic quantity with a preset standard waveform to determine whether the on-load tap changer has a fault.
In one embodiment, the diagnostic apparatus further includes a display module, connected to the analysis module, for displaying the feature quantity extracted by the analysis module and a waveform generated according to the feature quantity.
In one embodiment, the diagnostic apparatus further includes a management module connected to the analysis module for storing the feature quantities extracted by the analysis module in a local and/or upload database.
According to the diagnosis system for the on-load tap changer of the transformer, the vibration signal of the on-load tap changer in the transformer is collected by the vibration collection device arranged on the outer wall of the transformer, the situation that the vibration signal is collected in the transformer can be avoided, then the vibration signal is processed by the signal processing device, the obtained vibration signal is more accurate, finally the diagnosis device is arranged to extract the characteristics of a time domain and a frequency domain of the processed vibration signal, the vibration signal after the characteristic extraction is compared with a preset standard to analyze the mechanical characteristics of the on-load tap changer, and compared with a traditional diagnosis system for the on-load tap changer based on the vibration signal, the accuracy and the reliability are substantially improved.
Drawings
Fig. 1 is a schematic structural diagram of a transformer on-load tap changer diagnostic system in an embodiment;
fig. 2 is a schematic structural diagram of a transformer on-load tap changer diagnostic system in another embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Fig. 1 is a schematic structural diagram of a transformer on-load tap changer diagnostic system in an embodiment. The diagnosis system can comprise a vibration acquisition device 20, a signal processing device 30 and a diagnosis device 40; wherein, the vibration collecting device 20 is arranged on the outer wall of the transformer (not shown) and is used for collecting the vibration signal of the on-load tap changer 10; specifically, since one operation of the on-load tap changer of the transformer includes a series of action events, in which collision friction and the like of the selector and the commutator contact are accompanied with generation of a mechanical vibration signal, vibration propagates to the outer wall of the transformer through a medium such as transformer oil, and can be captured by arranging the vibration collection device 20 on the outer wall of the transformer, and the vibration collection device 20 can be arranged on the outer wall of the transformer in a magnetic attraction manner. The signal processing device 30 is connected with the vibration acquisition device 20 and is used for processing the vibration signal and outputting the processed vibration signal; specifically, the signal processing device 30 may process the vibration signal by simple processing such as filtering, voltage following, voltage limiting protection, and analog-to-digital conversion. The diagnosis device 40 is connected to the signal processing device 30, and is configured to perform time domain and frequency domain feature extraction on the processed vibration signal, and compare the extracted features with preset standard features to analyze mechanical characteristics of the on-load tap changer 10. The mechanical characteristic here mainly refers to whether the on-load tap changer has mechanical failure.
According to the diagnosis system for the on-load tap changer of the transformer, the vibration signal of the on-load tap changer in the transformer is collected by the vibration collection device arranged on the outer wall of the transformer, the situation that the vibration signal is collected in the transformer can be avoided, then the vibration signal is processed by the signal processing device, the obtained vibration signal is more accurate, finally the diagnosis device is arranged to extract the characteristics of a time domain and a frequency domain of the processed vibration signal, the vibration signal after the characteristic extraction is compared with a preset standard to analyze the mechanical characteristics of the on-load tap changer, and compared with a traditional diagnosis system for the on-load tap changer based on the vibration signal, the accuracy and the reliability are substantially improved.
Optionally, the vibration collection device 20 may include a vibration sensor (not shown), the vibration sensor employs a piezoelectric acceleration sensor, the piezoelectric acceleration sensor employs a piezoelectric ceramic buzzer as a piezoelectric conversion element, the measurement range of the piezoelectric acceleration sensor may be selected from-50 g to 50g, and the frequency response range may be selected from 0 to 20 KHz. It will be appreciated that in order to obtain a more accurate vibration signal, the vibration acquisition device 20 may include a plurality of vibration sensors, which may be located at different locations on the outer wall of the transformer.
In order to avoid the vibration acquisition device from blindly acquiring the vibration signal of the on-load tap changer of the transformer and from wasting resources, please refer to fig. 2, the diagnostic system of the present application is further provided with a vibration acquisition triggering module 50, which is arranged on a driving motor (not shown in the figure) of the on-load tap changer 10 and is configured to acquire a triggering signal when the driving motor is started; the vibration signal of the on-load tap changer 10 collected by the vibration collecting device 40 is a vibration signal which starts to be collected after the trigger signal is received. That is to say, the vibration acquisition device 40 of the present application is a vibration signal acquisition work that is started after receiving the trigger signal acquired by the vibration acquisition trigger module 50, and can avoid the vibration acquisition device 40 from blindly acquiring the vibration signal of the on-load tap changer of the transformer, which causes the waste of resources.
Further, with continued reference to fig. 2, the vibration acquisition trigger module 50 may include a current sensor 510 and a rotation angle sensor 520; the current sensor 510 is electrically connected with the driving motor and is used for acquiring a current signal of the driving motor; the rotation angle sensor 520 is coaxially arranged with a rotation shaft of the driving motor and is used for acquiring a rotation angle signal of the driving motor; the trigger signal includes the current signal and the rotation angle signal. Specifically, the current sensor 510 may have a range of 100A (peak), an output range of ± 1V; the shaft diameter of the rotation angle sensor 520 is 6mm, the mechanical rotation angle is 360 degrees, the continuous rotation is realized, and the linear measuring range is 90 degrees. During installation, the current sensor 510 is fixed in an electric mechanism box of the on-load tap changer 10, and an a-phase power line of the driving motor passes through a measuring hole in the middle of the current sensor 510. The rotation angle sensor 520 is fixed on the installation frame with adjustable vertical height by screws in a rubber rod type flexible connection mode, and rubber materials with certain elasticity are adopted for viscous coaxial connection between a rotation shaft of the driving motor and a rotation shaft of the rotation angle sensor 520.
Optionally, with continued reference to fig. 2, the signal processing apparatus 30 may include a signal conditioning circuit 310, an analog-to-digital conversion circuit 320, and a processing unit 330; the signal conditioning circuit 310 is connected to the vibration acquisition device 20, and is configured to perform conditioning and filtering processing on the vibration signal, specifically, the processing may be low-pass filtering, voltage following, voltage limiting protection, and the like; the analog-to-digital conversion circuit 320 is connected to the signal conditioning circuit 310, and is configured to convert the conditioned analog signal into a digital signal; specifically, the analog-to-digital conversion circuit 320 allows the input signal range to be-10V to 10V, so that the voltage output by the vibration acquisition device 20 can be matched, and the advantages of multi-channel high-speed synchronous sampling and conversion are achieved. The processing unit 330 is connected to the analog-to-digital conversion circuit 320, and is configured to analyze the digital signal. Specifically, the processing unit 330 may adopt an ARM processor, the ARM processor has 8-channel input, has a function of processing a multi-channel high-speed synchronous signal, has a large storage capacity, and can acquire data for a long time. It can be understood that each circuit in the signal processing device 30 may also be used to process the signals acquired by the current sensor 510 and the rotation angle sensor 520, and the specific processing mode is similar to the processing mode of the vibration signal, which is not described herein again.
Optionally, with continuing reference to fig. 2, the diagnostic system of the present application may further include an input device 60 connected to the processing unit 330, for displaying the analysis result of the processing unit 330 and receiving an operation instruction made by a user on the analysis result. Specifically, the input device 60 may include a display unit (not shown) and a keyboard (not shown); the display unit is used for displaying the analysis result of the processing unit 330; the analysis result may be data generated after being simply processed by the processing unit 330, and then a corresponding waveform is generated, the display unit may be an LCD display, and the LCD display has the characteristics of high definition and high refresh rate, and can display the waveform; the keyboard is used for receiving an operation instruction made by a user on the analysis result; specifically, the user may simply translate, stretch, etc. the waveform displayed on the LCD display through the keypad.
Alternatively, the connection between the diagnostic apparatus 40 and the signal processing apparatus 30 may be a wired connection or a wireless connection, and accordingly, when the wireless connection is adopted, a 4G communication module may be provided in the signal processing apparatus 30, and when the wired connection is adopted, a USB module may be provided in the signal processing apparatus 30. The USB module adopts a USB cable to communicate with the diagnosis device 40, has the characteristics of high transmission rate and high stability, and is suitable for the situation of large data volume; the 4G communication module communicates with the diagnostic device 40 through a 4G network, adopts a DataSocket technology provided by NI company, is established on the basis of a TCP/IP protocol, sets a service end IP address according to the requirements of a user in a dynamic control mode based on a program, is connected with a DataSocket server through a network by a DataSocket reading data function, monitors data information in the server in real time, starts the data reading function if new data exists, and downloads the measured data in the server into the diagnostic device 40.
Optionally, with continuing to refer to fig. 2, the diagnostic apparatus 40 may include an analysis module 410, the analysis module 410 is in communication connection with the processing unit 330, a 4G network may be adopted between the analysis module 410 and the processing unit 330 to implement communication connection, and the analysis module 410 is configured to extract a time domain characteristic quantity and a frequency domain characteristic quantity from the vibration signal, and compare a waveform formed by the extracted characteristic quantity with a preset standard waveform to determine whether the on-load tap changer 10 has a fault. Specifically, the analysis module 410 performs time domain analysis and frequency domain analysis on the vibration signal, and extracts a time domain characteristic quantity and a frequency domain characteristic quantity of the vibration signal, wherein the time domain analysis is to extract characteristic quantities such as an action interval time, a peak value, a root mean square, a kurtosis index, a pulse index and the like, and can reflect an action time characteristic, an energy characteristic, an impact characteristic and the like of the vibration signal; the frequency domain analysis is to perform wavelet transformation on the vibration signal, extract the characteristic quantities of the main characteristic frequency, modal energy and the like of the signal, and reflect the frequency domain distribution characteristics of the vibration signal. The analysis module 410 compares and analyzes the analyzed characteristics of the vibration signal with the characteristics of the standard waveform, so as to diagnose whether the on-load tap changer 10 has a fault; further, the analysis module 410 may also give a reference to the type of fault.
In an embodiment, with continuing reference to fig. 2, the diagnostic apparatus 40 may further include a display module 420, where the display module 420 is connected to the analysis module 410 and is configured to display the feature quantities extracted by the analysis module 410 and the waveforms generated according to the feature quantities. Specifically, the display module 420 of the present application may display the waveform of the vibration signal of the on-load tap changer 10, the time domain and frequency domain characteristic quantities extracted by the analysis module 410, and the diagnosis result of the analysis module 410.
Further, with continued reference to fig. 2, the diagnosis apparatus 40 may further include a management module 430 connected to the analysis module 410 for storing the feature quantities extracted by the analysis module 410 in a local and/or uploaded database.
In summary, according to the diagnosis system for the on-load tap changer of the transformer, the vibration signal of the on-load tap changer in the transformer is collected by the vibration collecting device arranged on the outer wall of the transformer, so that the vibration signal can be prevented from being collected deep into the transformer, then the vibration signal is processed by the signal processing device, the obtained vibration signal is more accurate, finally, the diagnosis device is arranged to extract the characteristics of the time domain and the frequency domain of the processed vibration signal, and the vibration signal after the characteristic extraction is compared with the preset standard to analyze the mechanical characteristics of the on-load tap changer, so that the accuracy and the reliability are substantially improved compared with the traditional diagnosis system for the on-load tap changer based on the vibration signal; furthermore, remote processing of data can be achieved by adopting a 4G network, and the problems of complex field wiring, short communication distance and the like caused by adoption of wired connection are avoided.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A transformer on-load tap changer diagnostic system, the diagnostic system comprising:
the vibration acquisition device is arranged on the outer wall of the transformer and used for acquiring a vibration signal of the on-load tap changer;
the signal processing device is connected with the vibration acquisition device and used for processing the vibration signal and outputting the processed vibration signal;
and the diagnosis device is connected with the signal processing device and is used for extracting the characteristics of the time domain and the frequency domain of the processed vibration signal and comparing the extracted characteristics with preset standard characteristics so as to analyze the mechanical characteristics of the on-load tap changer.
2. The transformer on-load tap changer diagnostic system of claim 1, further comprising:
the vibration acquisition triggering module is arranged on a driving motor of the on-load voltage regulating switch and used for acquiring a triggering signal when the driving motor is started; the vibration signal of the on-load voltage regulation switch collected by the vibration collection device is the vibration signal which starts to be collected after the trigger signal is received.
3. The transformer on-load tap changer diagnostic system of claim 2, wherein the vibration acquisition trigger module comprises a current sensor and a rotation angle sensor;
the current sensor is electrically connected with the driving motor and used for acquiring a current signal of the driving motor;
the rotation angle sensor is coaxially arranged with a rotation shaft of the driving motor and is used for acquiring a rotation angle signal of the driving motor; the trigger signal includes the current signal and the rotation angle signal.
4. The transformer on-load tap changer diagnostic system of claim 2, wherein the vibration acquisition device comprises a vibration sensor, and the vibration sensor is a piezoelectric acceleration sensor.
5. The transformer on-load tap changer diagnostic system of claim 2, wherein the signal processing means comprises a signal conditioning circuit, an analog-to-digital conversion circuit, and a processing unit;
the signal conditioning circuit is connected with the vibration acquisition device and is used for conditioning and filtering the vibration signals;
the analog-to-digital conversion circuit is connected with the signal conditioning circuit and is used for converting the conditioned analog signal into a digital signal;
the processing unit is connected with the analog-to-digital conversion circuit and used for analyzing the digital signals.
6. The transformer on-load tap changer diagnostic system of claim 5, further comprising an input device connected with the processing unit and configured to display the analysis result of the processing unit and receive an operation instruction made by a user on the analysis result.
7. The transformer on-load tap changer diagnostic system of claim 6, wherein the input device comprises a display unit and a keypad; the display unit is used for displaying the analysis result of the processing unit; the keyboard is used for receiving an operation instruction made by a user on the analysis result.
8. The transformer on-load tap changer diagnostic system of claim 5, wherein the diagnostic device comprises an analysis module, the analysis module is in communication connection with the processing unit, and is configured to extract time domain characteristic quantities and frequency domain characteristic quantities from the vibration signal, and compare a waveform formed by the extracted characteristic quantities with a preset standard waveform for analysis to determine whether the on-load tap changer has a fault.
9. The transformer on-load tap changer diagnostic system of claim 8, characterized in that the diagnostic device further comprises a display module, connected to the analysis module, for displaying the characteristic quantities extracted by the analysis module and the waveforms generated according to the characteristic quantities.
10. The transformer on-load tap changer diagnostic system of claim 8, characterized in that the diagnostic device further comprises a management module connected to the analysis module for storing the characteristic quantities extracted by the analysis module in a local and/or upload database.
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| CN201921621441.8U CN210834114U (en) | 2019-09-26 | 2019-09-26 | Transformer on-load tap changer diagnostic system |
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| CN201921621441.8U CN210834114U (en) | 2019-09-26 | 2019-09-26 | Transformer on-load tap changer diagnostic system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595752A (en) * | 2019-09-26 | 2019-12-20 | 广州供电局有限公司 | Transformer on-load tap changer diagnostic system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595752A (en) * | 2019-09-26 | 2019-12-20 | 广州供电局有限公司 | Transformer on-load tap changer diagnostic system |
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Effective date of registration: 20200918 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |
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