CN108593095A - A kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch - Google Patents
A kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch Download PDFInfo
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- CN108593095A CN108593095A CN201810384748.4A CN201810384748A CN108593095A CN 108593095 A CN108593095 A CN 108593095A CN 201810384748 A CN201810384748 A CN 201810384748A CN 108593095 A CN108593095 A CN 108593095A
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- signal
- tap switch
- power transformer
- converter power
- vibration
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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
- 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
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
Abstract
The present invention provides a kind of Vibration Fault Signal acquiring and processing methods of converter power transformer tap switch, include the following steps：Step (1), the Failure Characteristic Parameter collection for determining the equipment fault characteristic quantity of converter power transformer tap switch and establishing converter power transformer tap switch；Step (2), the Failure Characteristic Parameter for selection determine non-invasi measuring technique and application of the multisensor formula composite measurement technology in the vibration signals collecting of converter power transformer tap switch machine performance；Step (3) carries out data smoothing processing using moving average method to signal, eliminates the irregular trend item of signal；Step (4) is accurately extracted from collected mechanical oscillation signal and reconstructs each discrete vibration event, with the vibration condition of effectively identification switch.A kind of rationally effective change of current of present invention offer becomes tap switching on and shutting down tool vibration signals collecting and feature identification technique, and timely diagnosis is detected the hidden danger and failure of tap switch.
Description
Technical field
The invention belongs to signal processing technology field, more particularly to the vibration fault of a kind of converter power transformer tap switch is believed
Number acquiring and processing method.
Background technology
Super extra-high voltage direct-current transmission technology is to solve the important hand of high voltage, large capacity, remote power transmission and Power System Interconnection
Section.Converter power transformer is the core equipment of two end interface of the change of current and inversion in AC and DC transmission system, and reliable and secure operation is straight
Connect the stability for being related to AC and DC system.The change of current becomes critical piece of the tap switch as converter power transformer, once event occurs
Barrier will seriously affect the safe operation of change of current change.The converter power transformer run at present generally uses the parallel connection of more tap switches
Work, when action, bear huge mechanically and electrically stream impact and contact electric arc, parts are easily caused to loosen and the mechanical breakdowns such as bite.
It is shown according to investigation, accident accounts for about the total accident of converter power transformer caused by the change of current becomes tap switch abnormal work
20% or more, and the mechanical breakdown of the components such as contact, driving mechanism account for about the change of current become tap switch total failare 95% or more.
Currently, the detection of domestic common transformer tap switch machine performance is designed mainly for single tap switch, pass through measurement
The parameters such as transit time, transition waveform, transition resistance and synchronism realize the fault detect to load ratio bridging switch；But it is right
Become tap switch, the detection of common transformer tap switch machine performance in the change of current using double load ratio bridging switch parallel runnings
Method cannot effectively measure the relevant parameter of double tap switches and carry out fault detect.
Invention content
A kind of rationally effective change of current of present invention offer becomes tap switching on and shutting down tool vibration signals collecting and feature identification technique,
Diagnosis is detected the hidden danger and failure of tap switch in time, and becoming tap switch on-line monitoring for the change of current provides theoretical foundation and practice
Experience.
The present invention is specially a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch, and feature exists
In the Vibration Fault Signal acquiring and processing method of the converter power transformer tap switch specifically comprises the following steps：
Step (1)：In common failure pattern, fault characteristic value and the on-line monitoring of analysis converter power transformer tap switch
On the basis of the case where system common feature amount, determines the equipment fault characteristic quantity of converter power transformer tap switch and establish change of current change
The Failure Characteristic Parameter collection of depressor tap switch；
Step (2)：For the Failure Characteristic Parameter of selection, determine that non-invasi measuring technique is surveyed with multisensor formula synthesis
Application of the amount technology in the vibration signals collecting of converter power transformer tap switch machine performance, not influencing, tap switch is normal
On the basis of operation function, the multichannel transducing signal of reflection tap switch operation conditions is effectively obtained so that mechanical oscillation signal
Acquisition mode diversification；
Step (3)：It is superimposed with noise signal in the vibration signal data sampled by data collector, due to random
The frequency band of interference signal is wider, and the ratio shared by radio-frequency component is big so that on the oscillating curve that collected discrete data is drawn in
Many burrs are presented；In order to slacken the influence of interference signal, the smoothness of oscillating curve is improved, using moving average method to signal
Data smoothing processing is carried out, a smooth trend term curve is obtained, subtracts trend term curve with original signal, eliminate signal
Irregular trend item；
Step (4)：Signal after smooth is handled, with to the collected multi-source transducing signal of vibration signal sensor
The feature recognition for carrying out efficiently and accurately, i.e., accurately extraction and each discrete vibration of reconstruct from collected mechanical oscillation signal
Event, with the vibration condition of effectively identification switch.
Further, converter power transformer tap switch vibration signal characteristics are extracted using wavelet transformation in the step (1)
Amount seeks the method for modulus maximum with wavelet transformation and sign mutation corresponds, to extract the information in signal, modulus maxima
The amplitude of value indicates that the mutation strength characteristics of signal, concrete methods of realizing are in scale 2jUnder, using modulus maximum comparison expression, ask
Modulus maximum；Modulus maximum comparison expression is：Wherein,It is the small echo of function f (x)
Function, xnIt is the modulus maximum of wavelet transformation.
Further, data smoothing processing, the base of the method for average are carried out to signal using moving average method in the step (3)
This calculation formula is：
In formula, x is sampled data, and y is after smoothing processing as a result, m is data points, and 2N+1 is averagely counting, h be plus
The weight average factor；The weighted average factor must satisfy formula
Further, data smoothing processing is carried out to signal using simple average method, i.e.,：
hn=1/ (2N+1) (n=1,2 ..., N)
Further, data smoothing processing is carried out to signal using 5 weighted mean methods (N=2), taken
Linear smoothing is carried out to discrete data using principle of least square method, calculation formula is：
Specific implementation mode
Below to a kind of specific reality of the Vibration Fault Signal acquiring and processing method of converter power transformer tap switch of the present invention
The mode of applying elaborates.
A kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch of the present invention specifically includes following step
Suddenly：
Step (1)：In common failure pattern, fault characteristic value and the on-line monitoring of analysis converter power transformer tap switch
On the basis of the case where system common feature amount, determines the equipment fault characteristic quantity of converter power transformer tap switch and establish change of current change
The Failure Characteristic Parameter collection of depressor tap switch；
Step (2)：For the Failure Characteristic Parameter of selection, determine that non-invasi measuring technique is surveyed with multisensor formula synthesis
Application of the amount technology in the vibration signals collecting of converter power transformer tap switch machine performance, not influencing, tap switch is normal
On the basis of operation function, the multichannel transducing signal of reflection tap switch operation conditions is effectively obtained so that mechanical oscillation signal
Acquisition mode diversification；
Step (3)：It is superimposed with noise signal in the vibration signal data sampled by data collector, due to random
The frequency band of interference signal is wider, and the ratio shared by radio-frequency component is big so that on the oscillating curve that collected discrete data is drawn in
Many burrs are presented；In order to slacken the influence of interference signal, the smoothness of oscillating curve is improved, using moving average method to signal
Data smoothing processing is carried out, a smooth trend term curve is obtained, subtracts trend term curve with original signal, eliminate signal
Irregular trend item；
Step (4)：Signal after smooth is handled, with to the collected multi-source transducing signal of vibration signal sensor
The feature recognition for carrying out efficiently and accurately, i.e., accurately extraction and each discrete vibration of reconstruct from collected mechanical oscillation signal
Event, with the vibration condition of effectively identification switch.
Converter power transformer tap switch vibr ation signals are extracted using wavelet transformation in the step (1), use small echo
The method of modulus maximum is sought in transformation and sign mutation corresponds, to extract the information in signal, the amplitude of modulus maximum
Indicate that the mutation strength characteristics of signal, concrete methods of realizing are in scale 2jUnder, using modulus maximum comparison expression, seek modulus maxima
Value；Modulus maximum comparison expression is：Wherein,It is the wavelet function of function f (x), xnIt is
The modulus maximum of wavelet transformation.
Data smoothing processing is carried out to signal using moving average method in the step (3), the basic calculating of the method for average is public
Formula is：
In formula, x is sampled data, and y is after smoothing processing as a result, m is data points, and 2N+1 is averagely counting, h be plus
The weight average factor；The weighted average factor must satisfy formula
Data smoothing processing is carried out to signal using simple average method, i.e.,：
hn=1/ (2N+1) (n=1,2 ..., N)
Data smoothing processing is carried out to signal using 5 weighted mean methods (N=2), is taken
Linear smoothing is carried out to discrete data using principle of least square method, calculation formula is：
Finally it should be noted that only illustrating technical scheme of the present invention rather than its limitations in conjunction with above-described embodiment.Institute
The those of ordinary skill in category field is it is to be understood that those skilled in the art can repair the specific implementation mode of the present invention
Change or equivalent replacement, but these modifications or change are among applying for pending claims.
Claims (5)
1. a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch, which is characterized in that the change of current becomes
The Vibration Fault Signal acquiring and processing method of depressor tap switch specifically comprises the following steps：
Step (1)：In common failure pattern, fault characteristic value and the on-line monitoring system of analysis converter power transformer tap switch
On the basis of the case where common feature amount, determines the equipment fault characteristic quantity of converter power transformer tap switch and establish converter power transformer
The Failure Characteristic Parameter collection of tap switch；
Step (2)：For the Failure Characteristic Parameter of selection, non-invasi measuring technique and multisensor formula composite measurement skill are determined
Application of the art in the vibration signals collecting of converter power transformer tap switch machine performance is not influencing tap switch normal operation
On the basis of function, the multichannel transducing signal of reflection tap switch operation conditions is effectively obtained so that mechanical oscillation signal is adopted
Mode set diversification；
Step (3)：It is superimposed with noise signal in the vibration signal data sampled by data collector, due to random disturbances
The frequency band of signal is wider, and the ratio shared by radio-frequency component is big so that is presented on the oscillating curve that collected discrete data is drawn in
Many burrs；In order to slacken the influence of interference signal, the smoothness of oscillating curve is improved, signal is carried out using moving average method
Data smoothing processing, obtains a smooth trend term curve, subtracts trend term curve with original signal, eliminate not advising for signal
Then trend term；
Step (4)：Signal after smooth is handled, to be carried out to the collected multi-source transducing signal of vibration signal sensor
The feature recognition of efficiently and accurately is accurately extracted that is, from collected mechanical oscillation signal and reconstructs each discrete vibration thing
Part, with the vibration condition of effectively identification switch.
2. a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch according to claim 1,
It is characterized in that, extracts converter power transformer tap switch vibr ation signals using wavelet transformation in the step (1), use small echo
The method of modulus maximum is sought in transformation and sign mutation corresponds, to extract the information in signal, the amplitude of modulus maximum
Indicate that the mutation strength characteristics of signal, concrete methods of realizing are in scale 2jUnder, using modulus maximum comparison expression, seek modulus maxima
Value；Modulus maximum comparison expression is：Wherein,It is the wavelet function of function f (x), xnIt is
The modulus maximum of wavelet transformation.
3. a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch according to claim 1,
It is characterized in that, data smoothing processing is carried out to signal using moving average method in the step (3), the basic calculating of the method for average is public
Formula is：
In formula, x is sampled data, and y is after smoothing processing as a result, m is data points, and 2N+1 is averagely counting, and h is that weighting is flat
The equal factor；The weighted average factor must satisfy formula
4. a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch according to claim 3,
It is characterized in that, data smoothing processing is carried out to signal using simple average method, i.e.,：
hn=1/ (2N+1) (n=1,2 ..., N)
5. a kind of Vibration Fault Signal acquiring and processing method of converter power transformer tap switch according to claim 3,
It is characterized in that, as N=2, data smoothing processing is carried out to signal using 5 weighted mean methods, is taken
Linear smoothing is carried out to discrete data using principle of least square method, calculation formula is：
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113392511A (en) * | 2021-05-28 | 2021-09-14 | 广西电网有限责任公司电力科学研究院 | On-load tap-changer mechanical state monitoring method based on frequency spectrum envelope symbol entropy |
| CN114264981A (en) * | 2021-11-12 | 2022-04-01 | 上海电力大学 | Health state evaluation system of regional power grid power transformer based on cloud edge fusion |
| CN114264981B (en) * | 2021-11-12 | 2024-04-26 | 上海电力大学 | Regional power grid power transformer health state evaluation system based on cloud edge fusion |
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