CN110726539A - Transformer tap switch mechanical fault detection system based on multiple signal analysis and detection method thereof - Google Patents
Transformer tap switch mechanical fault detection system based on multiple signal analysis and detection method thereof Download PDFInfo
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- CN110726539A CN110726539A CN201910925979.6A CN201910925979A CN110726539A CN 110726539 A CN110726539 A CN 110726539A CN 201910925979 A CN201910925979 A CN 201910925979A CN 110726539 A CN110726539 A CN 110726539A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H17/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves, not provided for in the preceding groups
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/187—Machine fault alarms
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Abstract
The invention provides a transformer tap changer mechanical fault detection system based on multiple signal analysis, which comprises a signal acquisition unit, a signal processing unit, an A/D conversion unit, a control processing unit, a display unit, a storage unit, a key input unit, an alarm unit and a communication unit, wherein the signal acquisition unit is used for acquiring a signal; the tap changer mechanical fault detection system judges the mechanical condition of the tap changer according to the collected signals, timely sends out an alarm when abnormality occurs, and uploads the alarm to a monitoring center through the communication unit. The invention provides a transformer tap changer mechanical fault detection system and method based on multiple signal analysis, which effectively improve the working reliability of a tap changer and further ensure the safe and stable operation of an on-load tap changer and a power system.
Description
Technical Field
The invention belongs to the technical field of power detection, and particularly relates to a transformer tap changer mechanical fault detection system based on multiple signal analysis and a detection method thereof.
Background
The transformer tap changer is one of the important components of the on-load tap changing transformer, and the transformer realizes the on-load tap changing operation of the power distribution network through the step-by-step action of the tap changer connected with the high-voltage side coil of the transformer.
The detection and analysis of the mechanical vibration signal generated during the voltage regulation of the transformer tap changer are important guarantees for safe and stable operation of the on-load tap changing transformer and the power system. The invention provides a transformer tap changer mechanical fault detection system based on multiple signal analyses, which is used for respectively collecting working temperature and vibration information of a tap changer, realizing accurate analysis and judgment of data by adopting wavelet decomposition and digital filtering, effectively detecting the mechanical condition of the tap changer in real time, and giving an alarm in time when abnormal, thereby effectively improving the working reliability of the tap changer and further ensuring safe and stable operation of an on-load tap changer and a power system.
Disclosure of Invention
The invention provides a transformer tap changer mechanical fault detection system and method based on multiple signal analysis, which effectively improve the working reliability of a tap changer and further ensure the safe and stable operation of an on-load tap changer and a power system.
The invention particularly relates to a mechanical fault detection system of a tap changer of a transformer based on multiple signal analysis, which comprises a signal acquisition unit, a signal processing unit, an A/D conversion unit, a control processing unit, a display unit, a storage unit, a key input unit, an alarm unit and a communication unit, wherein the signal acquisition unit is sequentially connected with the signal processing unit, the A/D conversion unit and the control processing unit, and the control processing unit is also respectively connected with the display unit, the storage unit, the key input unit, the alarm unit and the communication unit; the tap changer mechanical fault detection system judges the mechanical condition of the tap changer according to the collected signals, timely sends out an alarm when abnormality occurs, and uploads the alarm to a monitoring center through the communication unit.
The signal acquisition unit adopts a vibration sensor to acquire a mechanical vibration signal of the tap switch and adopts a temperature sensor to acquire a temperature signal of the tap switch; the signal acquisition unit transmits acquired signals to the signal processing unit through a shielded cable.
The signal processing unit comprises an amplifying module and a filtering module, wherein the amplifying module adopts a signal amplifier to amplify input signals, and the filtering module adopts a low-pass filter to filter high-frequency interference signals.
The key input unit is combined with the display unit and the storage unit to carry out parameter setting and information inquiry, and the parameters comprise a temperature alarm value, a vibration alarm value and a vibration change rate alarm value.
And the control processing unit adopts a microprocessor to analyze and process the acquired data, judges whether the tap changer has mechanical faults and sends out an alarm in time.
The alarm unit adopts an audible and visual alarm, and can send out an alarm signal in time when the tap changer has mechanical failure; the communication unit adopts GPRS wireless communication technology will tap changer mechanical fault detecting system's information is uploaded to the surveillance center, the communication unit can also be right tap changer mechanical fault detecting system carries out remote parameter setting.
The invention also provides a detection method of the transformer tap changer mechanical fault detection system based on multiple signal analysis, and the detection method comprises the following steps:
step (1): collecting vibration signals and temperature signals of the tap switch;
step (2): amplifying the vibration signal by the signal amplifier;
and (3): filtering by the low-pass filter;
and (4): performing A/D conversion by the A/D conversion unit;
and (5): comparing the temperature signal with the temperature alarm value, and if the temperature signal is greater than the temperature alarm value, sending a high temperature alarm through the alarm unit;
and (6): from a predetermined wavelet base DB ═ { DB-iSelecting wavelets in the | i ═ 1,2 · · 10} in sequence to carry out wavelet decomposition on the vibration signal;
and (7): the wavelet decomposed signal passes through a threshold function
The noise signal is filtered out, and the noise signal is filtered out,
for wavelet coefficients after threshold processing, wj,kIs a wavelet coefficient, alphajTo adjust the coefficient, αj∈(0,+∞)；
And (8): filtering out narrow-band interference signals through a cascade digital filter to obtain effective vibration signals;
and (9): comparing the vibration signal with the vibration alarm value, and if the vibration signal is larger than the vibration alarm value, sending out a vibration alarm through the alarm unit;
step (10): calculating a rate of change of the vibration signal;
step (11): comparing the change rate of the vibration signal with the vibration change rate alarm value, and if the change rate of the vibration signal is greater than the vibration change rate alarm value, sending out a vibration change abnormity alarm through the alarm unit;
step (12): and uploading the information of the mechanical fault detection system of the tap changer to the monitoring center through the communication unit.
Drawings
Fig. 1 is a schematic structural diagram of a transformer tap changer mechanical fault detection system based on multiple signal analysis according to the present invention.
Fig. 2 is a flow chart of the operation of the detection method of the transformer tap changer mechanical fault detection system based on multiple signal analysis.
Detailed Description
The following describes in detail a specific embodiment of a transformer tap changer mechanical fault detection system based on multiple signal analyses according to the present invention with reference to the accompanying drawings.
As shown in fig. 1, the tap changer mechanical fault detection system of the present invention includes a signal acquisition unit, a signal processing unit, an a/D conversion unit, a control processing unit, a display unit, a storage unit, a key input unit, an alarm unit, and a communication unit, wherein the signal acquisition unit is sequentially connected to the signal processing unit, the a/D conversion unit, and the control processing unit is further connected to the display unit, the storage unit, the key input unit, the alarm unit, and the communication unit, respectively; the tap changer mechanical fault detection system judges the mechanical condition of the tap changer according to the collected signals, timely sends out an alarm when abnormality occurs, and uploads the alarm to a monitoring center through the communication unit.
The signal acquisition unit adopts a vibration sensor to acquire a mechanical vibration signal of the tap switch and adopts a temperature sensor to acquire a temperature signal of the tap switch; the signal acquisition unit transmits acquired signals to the signal processing unit through a shielded cable.
The signal processing unit comprises an amplifying module and a filtering module, wherein the amplifying module adopts a signal amplifier to amplify input signals, and the filtering module adopts a low-pass filter to filter high-frequency interference signals.
The key input unit is combined with the display unit and the storage unit to carry out parameter setting and information inquiry, and the parameters comprise a temperature alarm value, a vibration alarm value and a vibration change rate alarm value.
And the control processing unit adopts a microprocessor to analyze and process the acquired data, judges whether the tap changer has mechanical faults and sends out an alarm in time.
The alarm unit adopts an audible and visual alarm, and can send out an alarm signal in time when the tap changer has mechanical failure; the communication unit adopts GPRS wireless communication technology will tap changer mechanical fault detecting system's information is uploaded to the surveillance center, the communication unit can also be right tap changer mechanical fault detecting system carries out remote parameter setting.
As shown in fig. 2, the present invention further provides a detection method of a transformer tap changer mechanical fault detection system based on multiple signal analyses, wherein the detection method comprises the following steps:
step (1): collecting vibration signals and temperature signals of the tap switch;
step (2): amplifying the vibration signal by the signal amplifier;
and (3): filtering by the low-pass filter;
and (4): performing A/D conversion by the A/D conversion unit;
and (5): comparing the temperature signal with the temperature alarm value, and if the temperature signal is greater than the temperature alarm value, sending a high temperature alarm through the alarm unit;
and (6): from a predetermined wavelet base DB ═ { DB-iSelecting wavelets in the | i ═ 1,2 · · 10} in sequence to carry out wavelet decomposition on the vibration signal;
and (7): the wavelet decomposed signal passes through a threshold function
The noise signal is filtered out, and the noise signal is filtered out,
for wavelet coefficients after threshold processing, wj,kIs a wavelet coefficient, alphajTo adjust the coefficient, αj∈(0,+∞)；
And (8): filtering out narrow-band interference signals through a cascade digital filter to obtain effective vibration signals;
and (9): comparing the vibration signal with the vibration alarm value, and if the vibration signal is larger than the vibration alarm value, sending out a vibration alarm through the alarm unit;
step (10): calculating a rate of change of the vibration signal;
step (11): comparing the change rate of the vibration signal with the vibration change rate alarm value, and if the change rate of the vibration signal is greater than the vibration change rate alarm value, sending out a vibration change abnormity alarm through the alarm unit;
step (12): and uploading the information of the mechanical fault detection system of the tap changer to the monitoring center through the communication unit.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A transformer tap switch mechanical fault detection system based on multiple signal analyses is characterized by comprising a signal acquisition unit, a signal processing unit, an A/D conversion unit, a control processing unit, a display unit, a storage unit, a key input unit, an alarm unit and a communication unit, wherein the signal acquisition unit is sequentially connected with the signal processing unit, the A/D conversion unit and the control processing unit, and the control processing unit is respectively connected with the display unit, the storage unit, the key input unit, the alarm unit and the communication unit; the tap changer mechanical fault detection system detects and judges the mechanical condition of the tap changer according to the collected signals, can send out an alarm in time when abnormality occurs, and uploads the alarm to a monitoring center through the communication unit, so that the working reliability of the tap changer is improved.
2. The transformer tap changer mechanical fault detection system based on multiple signal analyses as claimed in claim 1, wherein said signal acquisition unit adopts a vibration sensor to acquire mechanical vibration signals of said tap changer, and adopts a temperature sensor to acquire temperature signals of said tap changer; the signal acquisition unit transmits acquired signals to the signal processing unit through a shielded cable.
3. The transformer tap changer mechanical fault detection system based on multiple signal analyses of claim 2, wherein the signal processing unit comprises an amplifying module and a filtering module, the amplifying module adopts a signal amplifier to amplify an input signal, and the filtering module adopts a low-pass filter to filter out a high-frequency interference signal.
4. The transformer tap changer mechanical fault detection system based on multiple signal analyses of claim 3, wherein the key input unit is combined with the display unit and the storage unit to perform parameter setting and information query, and the parameters comprise a temperature alarm value, a vibration alarm value and a vibration change rate alarm value.
5. The transformer tap switch mechanical fault detection system based on multiple signal analyses of claim 4, characterized in that the control processing unit adopts a microprocessor to analyze and process the collected data, determine whether the tap switch has a mechanical fault and send out an alarm in time.
6. The transformer tap switch mechanical fault detection system based on multiple signal analyses is characterized in that the alarm unit adopts an acousto-optic alarm, and when the tap switch has a mechanical fault, an alarm signal can be sent out in time; the communication unit adopts GPRS wireless communication technology will tap changer mechanical fault detecting system's information is uploaded to the surveillance center, the communication unit can also be right tap changer mechanical fault detecting system carries out remote parameter setting.
7. The method for detecting a mechanical fault detection system of a transformer tap changer based on multiple signal analyses according to any of claims 1-6, characterized in that the method comprises the steps of:
step (1): collecting vibration signals and temperature signals of the tap switch;
step (2): amplifying the vibration signal by the signal amplifier;
and (3): filtering by the low-pass filter;
and (4): performing A/D conversion by the A/D conversion unit;
and (5): comparing the temperature signal with the temperature alarm value, and if the temperature signal is greater than the temperature alarm value, sending a high temperature alarm through the alarm unit;
and (6): from a predetermined wavelet base DB ═ { DB-iSelecting wavelets in the | i ═ 1,2 · · 10} in sequence to carry out wavelet decomposition on the vibration signal;
and (7): the wavelet decomposed signal passes through a threshold function
The noise signal is filtered out, and the noise signal is filtered out,
for wavelet coefficients after threshold processing, wj,kIs a wavelet coefficient, alphajTo adjust the coefficient, αj∈(0,+∞)；
And (8): filtering out narrow-band interference signals through a cascade digital filter to obtain effective vibration signals;
and (9): comparing the vibration signal with the vibration alarm value, and if the vibration signal is larger than the vibration alarm value, sending out a vibration alarm through the alarm unit;
step (10): calculating a rate of change of the vibration signal;
step (11): comparing the change rate of the vibration signal with the vibration change rate alarm value, and if the change rate of the vibration signal is greater than the vibration change rate alarm value, sending out a vibration change abnormity alarm through the alarm unit;
step (12): and uploading the information of the mechanical fault detection system of the tap changer to the monitoring center through the communication unit.
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| CN112345979A (en) * | 2020-10-29 | 2021-02-09 | 国网江苏省电力有限公司盐城供电分公司 | Transformer fault detection system |
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Application publication date: 20200124 |