CN113325302A - Transformer on-load tap-changer state monitoring device - Google Patents
Transformer on-load tap-changer state monitoring device Download PDFInfo
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- CN113325302A CN113325302A CN202110471887.2A CN202110471887A CN113325302A CN 113325302 A CN113325302 A CN 113325302A CN 202110471887 A CN202110471887 A CN 202110471887A CN 113325302 A CN113325302 A CN 113325302A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a transformer on-load tap-changer state monitoring device which comprises a vibration acquisition unit arranged on a tap-changer top cover, a current acquisition unit arranged on a driving motor and an angular speed acquisition unit arranged on a transmission shaft, wherein the vibration acquisition unit is used for acquiring vibration signals on the top cover, the current acquisition unit is used for acquiring current signals of the driving motor, the angular speed acquisition unit is used for acquiring angular speed signals of the transmission shaft, the vibration acquisition unit, the current acquisition unit and the angular speed acquisition unit are respectively connected with a signal analysis unit through signal conditioning modules, and the signal analysis unit is used for judging the running state of a tap-changer. According to the transformer on-load tap-changer state monitoring device, the running state of the tap-changer is judged in a mode that three parameters are mutually verified, the accuracy of tap-changer state judgment is improved, risk pre-control is realized, the influence of power failure caused by maintenance after the tap-changer is abnormal is avoided, and the time cost and the equipment maintenance cost are reduced.
Description
Technical Field
The invention relates to the technical field of transformer monitoring, in particular to a state monitoring device for an on-load tap-changer of a transformer.
Background
With the rapid development of the power industry in China, the capacity of power equipment and the scale of a power network are gradually enlarged, and higher requirements and unprecedented challenges are provided for the power supply quality. The state monitoring and fault diagnosis of the power equipment mainly finds out the fault rule of the early-stage latent fault of the current equipment through various technical means, and the diagnosis of the fault is one of the hot spots of the current power system research. The method and the device are two aspects of a problem in transient fault judgment after protection action, and relay protection cannot solve hidden and latent early faults, so that the method and the device have important significance in researching power equipment state monitoring and fault diagnosis.
When the voltage of the power transformer is regulated, the voltage is often regulated by using a transformer on-load tap-changer, which generally comprises a driving mechanism, a selector switch, a change-over switch and the like. The change-over switch quickly completes gear switching according to a preset sequence through the quick switching mechanism, and has arc extinguishing capacity. The selector switch is responsible for switching on the tap of the gear to be shifted before the gear shift in advance and switching on the load current. The driving mechanism mainly comprises a driving motor, a transmission shaft, an umbrella-shaped gear box and the like, wherein the transmission shaft, the umbrella-shaped gear box and the like are horizontally and vertically arranged, the driving mechanism is a power source for carrying out gear shifting operation on the transformer on-load tap-changer, and a three-phase motor is generally adopted for driving.
At present, the on-load tap-changer of the transformer in China still adopts an off-line periodic maintenance mode, and the application of a relatively perfect on-line monitoring and diagnosing system in the actual production is very rare and immature. The disadvantages of the off-line periodic maintenance mode are large workload, low efficiency and low measurement precision. At present, effective means are urgently needed to be adopted to conveniently and reasonably monitor the running state of the on-load tap-changer of the transformer.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a transformer on-load tap-changer state monitoring device, which can determine whether the on-load tap-changer is operating normally in real time.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a transformer on-load tap-changer state monitoring devices, including setting up the vibration acquisition unit on the tap-changer top cap, set up current acquisition unit on driving motor, the angular velocity acquisition unit of setting on the transmission shaft, the vibration acquisition unit is used for gathering the vibration signal on the top cap, current acquisition unit is used for gathering driving motor's current signal, angular velocity acquisition unit is used for gathering the angular velocity signal of transmission shaft, the vibration acquisition unit, current acquisition unit, angular velocity acquisition unit passes through signal conditioning module respectively and connects signal analysis unit, signal analysis unit is used for judging tap-changer's running state.
Further, the operation states of the tap changer include gear shifting not performed, gear shifting in-process, gear shifting completed and abnormal gear shifting.
Furthermore, the vibration acquisition unit comprises an acceleration sensor sampling circuit with adjustable gain, the sampling circuit comprises an acceleration sensor, the acceleration sensor is used for acquiring vibration signals on the top cover, and the sampling circuit also comprises a signal detector which is used for detecting output signals of the acceleration sensor; the sampling circuit further comprises an operational amplifier adjustable gain circuit, and the operational amplifier adjustable gain circuit is used for adjusting the gain of the sampling circuit.
Furthermore, the acceleration sensor adopts an AC102-1A type acceleration sensor, the signal detector is AD8222, the operational amplifier adjustable gain circuit comprises a TS3A5017 chip, and the TS3A5017 equivalent resistance is adjusted by adjusting the configuration of an EN pin, an SL1 pin and an SL2 pin of the TS3A5017 chip, so that the magnitude of a differential analog voltage signal output by the sampling circuit is adjusted.
Further, the signal conditioning module transmits the vibration signal to the signal analysis unit after carrying out dynamic gain adjustment on the vibration signal, the signal conditioning module enables the vibration signal amplitude to be within a preset amplitude range by increasing or reducing the gain of the sampling circuit, the signal analysis unit is convenient to analyze the vibration signal, the signal conditioning circuit carries out vibration intensity calculation after adjusting the vibration signal amplitude within the preset amplitude range, when the vibration intensity is greater than the preset vibration intensity, the tap switch is judged to be abnormal, and when the vibration intensity is not greater than the preset vibration intensity, the tap switch is judged to be normal.
Further, the signal analysis unit carries out autocorrelation analysis on vibration signals acquired by the acceleration sensor, identifies the running state of the tap changer, and the autocorrelation analysis comprises autocorrelation analysis of each stage of the gear shifting process and autocorrelation analysis of a reference waveform.
Further, the autocorrelation analysis function at each stage of the gear shifting process is defined as:
wherein τ is a time variation value, when the value of f (t) is constant, if D (τ) is kept stable with the increase of time τ, it indicates that the correlation between the original signal f (t) and the subsequent continuous signal f (t + τ) is stable; if D (tau) is gradually reduced, the correlation between the original signal f (t) and the subsequent continuous signal f (t + tau) is reduced, and the original signal f (t) is not similar to the subsequent continuous signal f (t + tau) and the signal is changed;
for a discrete sampling sequence { f (t) } of an arbitrary vibration signal, if the total number of sampling points per sampling period is N, the autocorrelation function after the change time τ is:
the function of the autocorrelation analysis with the reference waveform is:
further, the signal analysis unit compares the autocorrelation coefficients of two adjacent periods by adopting a dynamic period and period iteration method for the vibration signal, and when the autocorrelation coefficients of the two adjacent periods are higher than a preset value, the state of the tap changer is stable; when the autocorrelation coefficient of adjacent periods is lower than the preset value, the state change of the tap changer is indicated. And continuously using the reference vibration waveform and the real-time vibration waveform corresponding to the gear shifting stage to carry out correlation analysis on the detected state change, wherein when the correlation is higher than a preset value, the tap switch is normal, and when the correlation is lower than the preset value, the tap switch is abnormal.
Further, the signal analysis unit comprehensively analyzes the vibration signal, the current signal and the angular velocity signal, judges the running state of the tap switch, and judges that gear shifting is not carried out when the current is zero, the rotation angular velocity is zero and the vibration amplitude of the top cover is small; when the current suddenly increases, the rotation angular velocity suddenly increases and the vibration of the top cover slightly increases, the gear shifting is judged to be in process; when the current rating, the rotation angular velocity rating and the top cover vibration pulse are increased, judging that the gear shifting is in switching; when the current of the motor is zero, the rotation angular velocity is zero and the vibration amplitude of the top cover is small, the gear shifting is judged to be completed, and the other conditions are judged to be abnormal gear shifting.
Furthermore, the monitoring device also comprises a human-computer interaction unit, and the human-computer interaction unit comprises an input module and a display module.
Compared with the prior art, the on-load tap-changer state monitoring device for the transformer has the following beneficial effects:
1. according to the transformer on-load tap-changer state monitoring device, the vibration situation of the top cover, the current signal of the driving motor and the angular velocity situation of the transmission shaft corresponding to a plurality of working states in the working process of the tap-changer are utilized, the vibration acquisition unit, the current acquisition unit and the angular velocity acquisition unit are designed, the signal analysis unit is utilized to carry out comprehensive analysis, the running state of the tap-changer is judged to be gear-shifting failure, gear-shifting middle, gear-shifting switching middle, gear-shifting completion or gear-shifting abnormity, the running state of the tap-changer can be monitored in real time, risk pre-control is realized, the power failure influence caused by overhaul after the tap-changer is abnormal is avoided, and the time cost and the equipment maintenance cost are reduced.
2. The on-load tap-changer state monitoring device for the transformer utilizes the acceleration sensor to collect vibration signals, is provided with the signal detector to detect output signals of the acceleration sensor, and is provided with the operational amplifier adjustable gain circuit used for adjusting the gain of the sampling circuit. The signal conditioning module increases or decreases the gain of the sampling circuit to enable the amplitude of the vibration signal to be within a preset amplitude range, so that the signal analysis unit can analyze the vibration signal conveniently.
3. The transformer on-load tap-changer state monitoring device provided by the invention adopts autocorrelation analysis for analyzing the vibration signal, wherein the autocorrelation analysis comprises autocorrelation analysis of each stage in the gear shifting process and autocorrelation analysis of a reference waveform, and two autocorrelation analysis methods are combined for use, so that the running state of the tap-changer can be more accurately judged.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a transformer on-load tap changer condition monitoring device provided by the invention;
FIG. 2 is a circuit diagram of a gain adjustable acceleration sensor sampling circuit;
fig. 3 is an algorithmic flow chart of vibration signal autocorrelation analysis of a tap changer;
fig. 4 is a flow chart of an algorithm of the tap changer signal analysis unit.
In the figure, 10 tap changers, 100 vibration acquisition units, 200 current acquisition units, 300 angular speed acquisition units, 400 signal conditioning modules and 500 signal analysis units are shown.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The operation states of the tap changer in the operation process comprise gear shifting failure, gear shifting in progress, gear shifting switching in progress, gear shifting completion, abnormal gear shifting and the like. In the operation process of the tap changer, a certain vibration signal can be generated, the current on the driving motor can be changed, and the angular speed on the transmission shaft can be changed. The on-load tap-changer state monitoring device of the transformer is provided based on the characteristics in the operation process of the tap-changer.
Tap changers generate certain vibration signals during operation, and the propagation paths of tap changer vibration signals generally include two types: one is that the signal is transmitted to a tap changer top cover through a switch contact and a transmission rod; one is that the oil in the tap changer tank is transferred from the switch contacts to the wall of the tap changer tank, then through the transformer oil and finally to the transformer side wall. The monitoring of the gear shifting vibration is mainly carried out from a tap changer top cover.
At different stages of the gear shifting operation of the tap changer, the characteristics reflected by the vibration signal of the tap changer top cover are different:
1. when starting gear shifting: the driving motor is started with a spring load, a vibration signal is the background vibration of the transformer, and the amplitude of a high-frequency vibration signal is smaller;
2. in the gear shifting process: the driving motor continuously enables the spring to store energy through the transmission mechanism, the vibration signal mainly refers to the background vibration of the transformer, and the low-frequency vibration amplitude is low;
3. when the gears are switched: the spring releases energy instantly, the gear is switched, the vibration signal is pulse type vibration lasting for 40-200 ms, the frequency is high, and the amplitude is also high;
4. stopping gear shifting: the vibration signal is quickly attenuated and is the background vibration of the transformer, and the amplitude is small.
The magnitude of the working current of the driving motor can be used for representing the working state of the motor. In the different phases of the tap-off gear shifting operation, the drive motor current exhibits the following characteristics:
1. when starting gear shifting: the current of the motor is increased suddenly from zero, the current is in a peak form, the amplitude is 2 times or more of the rated current of the motor, and then the current is rapidly reduced to the rated current of the motor;
2. in the gear shifting process: the current output signal of the motor is stable and is kept near a rated value;
3. finishing gear shifting: the current signal of the motor is stable and is kept near a rated value;
4. stopping gear shifting: the motor current decays rapidly from the nominal value to zero.
The angular speed of the transmission shaft can be used for reflecting the working state of the driving motor and the mechanical linkage state of the selection switch and the change-over switch.
In different stages of the gear shifting operation of the on-load tap-changer, the angular speed of the transmission shaft presents the following characteristics:
1. when starting gear shifting: the transmission shaft angular velocity increases from zero to a steady angular velocity;
2. in the gear shifting process: the angular speed of the transmission shaft is kept stable;
3. finishing gear shifting: the angular speed of the transmission shaft is kept stable;
4. stopping gear shifting: the drive shaft angular velocity suddenly decreases to zero.
Based on the above facts, the applicant proposes a transformer on-load tap-changer state monitoring device, please refer to fig. 1, where fig. 1 is a schematic diagram of the transformer on-load tap-changer state monitoring device provided by the present invention. The utility model provides a transformer on-load tap-changer state monitoring device, including setting up vibration acquisition unit 100 on tap-changer 10 top cap, set up current acquisition unit 200 on driving motor, set up at epaxial angular velocity acquisition unit 300 of transmission, vibration acquisition unit 100 is used for gathering the vibration signal on the top cap, current acquisition unit 200 is used for gathering driving motor's current signal, angular velocity acquisition unit 300 is used for gathering the angular velocity signal of transmission shaft, vibration acquisition unit 100, current acquisition unit 200, angular velocity acquisition unit 300 connects signal analysis unit 500 through signal conditioning module 400 respectively, signal analysis unit 500 is used for judging tap-changer 10's running state. In some preferred embodiments, the monitoring device further comprises a human-computer interaction unit, and the human-computer interaction unit comprises an input module and a display module, so as to facilitate the input of instructions and the display of monitoring results.
Referring to fig. 2, fig. 2 is a circuit diagram of a gain-adjustable sampling circuit of an acceleration sensor; in some preferred embodiments, the vibration acquisition unit 100 includes an acceleration sensor sampling circuit with adjustable gain, the sampling circuit includes an acceleration sensor, the acceleration sensor is used for acquiring vibration signals on the top cover, and the acceleration sensor adopts an AC102-1A type acceleration sensor; because the output signal of the acceleration sensor is in the mV level, the sampling circuit further comprises a signal detector, the signal detector is used for detecting the output signal of the acceleration sensor, in some specific embodiments, the signal detector is AD8222, and the AD8222 is used for detecting the output signal of AC 102-1A; in order to adjust the matching between the sampling signal of the vibration sensor and the post-stage signal analysis unit 500, the sampling circuit further comprises an operational amplifier adjustable gain circuit for adjusting the gain of the sampling circuit. In some embodiments, the operational amplifier adjustable gain circuit includes a TS3a5017 chip, and the TS3a5017 equivalent resistance is adjusted by adjusting configurations of an EN pin, an SL1 pin, and an SL2 pin of the TS3a5017 chip, so as to adjust a magnitude of the differential analog voltage signal output by the sampling circuit.
The signal conditioning module 400 transmits the vibration signal to the signal analysis unit 500 after performing dynamic gain adjustment on the vibration signal, and the signal conditioning module 400 increases or decreases the gain of the sampling circuit to make the amplitude of the vibration signal within a preset amplitude range, so that the signal analysis unit 500 can analyze the vibration signal conveniently. Specifically, digital filtering is performed on the acquired vibration signal, whether the amplitude of the vibration signal is smaller than a preset minimum value or not is judged, and if the amplitude of the vibration signal is smaller than the preset minimum value, the gain of the sampling circuit is increased; then, carrying out digital filtering processing, continuously judging whether the amplitude of the vibration signal is smaller than a preset minimum value, and if the amplitude of the vibration signal is smaller than the preset minimum value, continuously increasing the gain of the sampling circuit until the amplitude of the vibration signal is not smaller than the preset minimum value; then judging whether the amplitude of the vibration signal is larger than a preset maximum value or not, and if the amplitude of the vibration signal is larger than the preset maximum value, reducing the gain of the sampling circuit; then, carrying out digital filtering processing, continuously judging whether the amplitude of the vibration signal is greater than a preset maximum value, and if the amplitude of the vibration signal is greater than the preset maximum value, continuously reducing the gain of the sampling circuit until the amplitude of the vibration signal is not greater than the preset minimum value; and after the signal conditioning circuit adjusts the amplitude of the vibration signal within a preset amplitude range, calculating the vibration intensity, judging that the tap switch is abnormal when the vibration intensity is greater than the preset vibration intensity, and judging that the tap switch is normal when the vibration intensity is not greater than the preset vibration intensity.
Under the normal working condition of the tap changer, the nonlinear characteristics and harmonic characteristics of each operation are similar; if the on-load tap-changer is abnormal, the nonlinear characteristics in the vibration signal of the on-load tap-changer are changed, and the abnormal state of the on-load tap-changer can be identified by adopting an autocorrelation analysis method according to the characteristics. In a typical vibration waveform of normal gear shifting of the on-load tap-changer, a vibration signal before gear shifting has a certain amplitude, and the amplitude is background vibration of the transformer; during gear switching, the vibration signal generates a plurality of obvious wave crests, each wave crest corresponds to one time of mechanical friction or collision in the gear switching process, the similarity of the envelope curve of the vibration signal is adopted to analyze the vibration signal, and the similarity of the waveform can be judged by adopting an autocorrelation method.
In some preferred embodiments, the signal analysis unit 500 performs autocorrelation analysis on the vibration signal collected by the acceleration sensor to identify the operating state of the tap changer.
For any continuous signal f (t), the autocorrelation function is defined as:
wherein τ is a time variation value, when the value of f (t) is constant, if D (τ) is kept stable with the increase of time τ, it indicates that the correlation between the original signal f (t) and the subsequent continuous signal f (t + τ) is stable; if D (τ) is gradually decreased, it indicates that the correlation between the original signal f (t) and the subsequent sustained signal f (t + τ) is decreased, and also indicates that the original signal f (t) is not similar to the subsequent sustained signal f (t + τ) and the signal is changed.
For a discrete sampling sequence { f (t) } of an arbitrary vibration signal, if the total number of sampling points per sampling period is N, the autocorrelation function after the change time τ is:
in practical applications, τ should be dynamically adjusted as the shift process progresses to accommodate the algorithmic analysis needs.
1. Autocorrelation analysis of stages of a gear shifting process
The identification of the state of the switch gear shifting process can be carried out by an autocorrelation analysis method.
When the on-load tap-changer is not shifted, the vibration frequency is mainly 100Hz, and the correlation change time tau is set to be 1S.
When the gear shifting is started, the vibration signal has high-frequency vibration sudden change, the sudden change can be contained in the background vibration signal of the 1S period, and the autocorrelation signals of the front period and the back period are different due to the difference of the high-frequency vibration signal, so that the starting of the gear shifting can be identified.
After the gear shifting is started, in order to ensure that a high-frequency pulse vibration signal generated at the moment of gear shifting can be monitored in real time, the correlation change time tau is adjusted to be about 100 ms.
At the gear switching moment of the gear shifting process, a high-frequency pulse signal exists in a vibration correlation signal with a period of 100ms, and autocorrelation signals of two periods before and after are different due to the difference of the high-frequency vibration signals, so that the gear switching can be identified.
After gear switching is completed, the vibration signal is background vibration of the transformer, and the correlation change time tau is set to be 1S.
2. The method for carrying out autocorrelation judgment on the reference waveform comprises the following steps:
in some preferred embodiments, the autocorrelation analysis includes autocorrelation analysis at various stages of the shift process and autocorrelation analysis with a reference waveform. The two autocorrelation analysis methods are combined for use, so that the running state of the tap changer can be judged more accurately. Referring to fig. 3, fig. 3 is a flowchart of an algorithm for vibration signal autocorrelation analysis of the tap changer. The signal analysis unit 500 compares the autocorrelation coefficients of two adjacent periods by adopting a dynamic period and period iteration method for the vibration signal, and when the autocorrelation coefficients of the two adjacent periods are higher than a preset value, the state of the tap changer is stable; when the autocorrelation coefficient of adjacent periods is lower than the preset value, the state change of the tap changer is indicated. And continuously using the reference vibration waveform and the real-time vibration waveform corresponding to the gear shifting stage to carry out correlation analysis on the detected state change, wherein if the correlation is higher than a preset value, the tap switch is normal, and if the correlation is low, the tap switch is abnormal.
Referring to fig. 4, fig. 4 is a flowchart of an algorithm of the tap changer signal analysis unit 500. The signal analysis unit 500 comprehensively analyzes the vibration signal, the current signal and the angular velocity signal, judges the running state of the tap changer, and judges that gear shifting is not performed when the current is zero, the rotation angular velocity is zero and the vibration amplitude of the top cover is small; when the current suddenly increases, the rotation angular velocity suddenly increases and the vibration of the top cover slightly increases, the gear shifting is judged to be in process; when the current rating, the rotation angular velocity rating and the top cover vibration pulse are increased, judging that the gear shifting is in switching; when the current of the motor is zero, the rotation angular velocity is zero and the vibration amplitude of the top cover is small, the gear shifting is judged to be completed, and the other conditions are judged to be abnormal gear shifting. The running state of tap changer is judged to the mode that analysis unit adopted three kinds of parameter to demonstrate evidence each other in this patent application, has increased the accuracy that tap changer state was judged, realizes that the risk is in advance controlled, avoids taking place to overhaul the power failure influence that brings after unusual at tap changer, reduces time cost and equipment cost of maintenance.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. The utility model provides a transformer on-load tap-changer state monitoring devices, a serial communication port, monitoring devices is including setting up vibration acquisition unit on the tap-changer top cap, setting up current acquisition unit on driving motor, setting up the angular velocity acquisition unit at the transmission shaft, vibration acquisition unit is used for gathering the vibration signal on the top cap, current acquisition unit is used for gathering driving motor's current signal, angular velocity acquisition unit is used for gathering the angular velocity signal of transmission shaft, vibration acquisition unit current acquisition unit angular velocity acquisition unit connects signal analysis unit through signal conditioning module respectively, signal analysis unit is used for judging tap-changer's running state.
2. The on-load tap changer state monitoring device of claim 1, wherein the operating states of the tap changer comprise gear shift not-in-progress, gear shift completed and gear shift abnormality.
3. The on-load tap changer state monitoring device of claim 2, wherein the vibration acquisition unit comprises an acceleration sensor sampling circuit with adjustable gain, the sampling circuit comprises an acceleration sensor, the acceleration sensor is used for acquiring vibration signals on a top cover, the sampling circuit further comprises a signal detector, and the signal detector is used for detecting output signals of the acceleration sensor; the sampling circuit further comprises an operational amplifier adjustable gain circuit, and the operational amplifier adjustable gain circuit is used for adjusting the gain of the sampling circuit.
4. The on-load tap-changer state monitoring device of the transformer of claim 3, wherein the acceleration sensor is an AC102-1A type acceleration sensor, the signal detector is an AD8222, the operational amplifier adjustable gain circuit comprises a TS3a5017 chip, and the TS3a5017 equivalent resistance is adjusted by adjusting configurations of an EN pin, an SL1 pin and an SL2 pin of the TS3a5017 chip, so as to adjust a magnitude of the differential analog voltage signal output by the sampling circuit.
5. The on-load tap-changer state monitoring device of claim 4, wherein the signal conditioning module transmits the vibration signal to the signal analysis unit after performing dynamic gain adjustment on the vibration signal, the signal conditioning module increases or decreases the gain of the sampling circuit to make the amplitude of the vibration signal within a preset amplitude range, so that the signal analysis unit can analyze the vibration signal conveniently, the signal conditioning circuit performs vibration intensity calculation after adjusting the amplitude of the vibration signal within the preset amplitude range, when the vibration intensity is greater than the preset vibration intensity, the tap-changer is judged to be abnormal, and when the vibration intensity is not greater than the preset vibration intensity, the tap-changer is judged to be normal.
6. The on-load tap-changer state monitoring device of claim 3, wherein the signal analysis unit performs autocorrelation analysis on the vibration signal collected by the acceleration sensor to identify the operation state of the tap-changer, and the autocorrelation analysis comprises autocorrelation analysis at each stage of the gear shifting process and autocorrelation analysis with a reference waveform.
7. The on-load tap-changer state monitoring device of claim 6, wherein the autocorrelation analysis function at each stage of the gear shifting process is defined as:
wherein τ is a time variation value, when the value of f (t) is constant, if D (τ) is kept stable with the increase of time τ, it indicates that the correlation between the original signal f (t) and the subsequent continuous signal f (t + τ) is stable; if D (tau) is gradually reduced, the correlation between the original signal f (t) and the subsequent continuous signal f (t + tau) is reduced, and the original signal f (t) is not similar to the subsequent continuous signal f (t + tau) and the signal is changed;
for a discrete sampling sequence { f (t) } of an arbitrary vibration signal, if the total number of sampling points per sampling period is N, the autocorrelation function after the change time τ is:
the function of the autocorrelation analysis with the reference waveform is:
8. the on-load tap-changer state monitoring device of the transformer according to claim 7, wherein the signal analysis unit compares the autocorrelation coefficients of two adjacent periods by using a dynamic period and period iteration method for the vibration signal, and when the autocorrelation coefficients of the two adjacent periods are higher than a preset value, the tap-changer state is stable; when the autocorrelation coefficient of adjacent periods is lower than the preset value, the state change of the tap changer is indicated. And continuously using the reference vibration waveform and the real-time vibration waveform corresponding to the gear shifting stage to carry out correlation analysis on the detected state change, wherein when the correlation is higher than a preset value, the tap switch is normal, and when the correlation is lower than the preset value, the tap switch is abnormal.
9. The on-load tap-changer state monitoring device of the transformer according to claim 2, wherein the signal analysis unit comprehensively analyzes the vibration signal, the current signal and the angular velocity signal, judges the operation state of the tap-changer, and judges that the gear shifting is not performed when the current is zero, the angular velocity is zero and the vibration amplitude of the top cover is small; when the current suddenly increases, the rotation angular velocity suddenly increases and the vibration of the top cover slightly increases, the gear shifting is judged to be in process; when the current rating, the rotation angular velocity rating and the top cover vibration pulse are increased, judging that the gear shifting is in switching; when the current of the motor is zero, the rotation angular velocity is zero and the vibration amplitude of the top cover is small, the gear shifting is judged to be completed, and the other conditions are judged to be abnormal gear shifting.
10. The on-load tap-changer state monitoring device of a transformer according to claim 2, characterized in that said monitoring device further comprises a human-machine interaction unit, said human-machine interaction unit comprising an input module and a presentation module.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113970521A (en) * | 2021-10-15 | 2022-01-25 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method and device for monitoring tap switch oil sample |
| CN116956203A (en) * | 2023-09-21 | 2023-10-27 | 山东和兑智能科技有限公司 | Method and system for measuring action characteristics of tapping switch of transformer |
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| CN116956203A (en) * | 2023-09-21 | 2023-10-27 | 山东和兑智能科技有限公司 | Method and system for measuring action characteristics of tapping switch of transformer |
| CN116956203B (en) * | 2023-09-21 | 2023-12-15 | 山东和兑智能科技有限公司 | Method and system for measuring action characteristics of tapping switch of transformer |
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