CN109932053A - A kind of state monitoring apparatus and method for high-voltage shunt reactor - Google Patents
A kind of state monitoring apparatus and method for high-voltage shunt reactor Download PDFInfo
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Abstract
The invention discloses a kind of state monitoring apparatus and method for high-voltage shunt reactor, including connected vibration signals collecting unit and signal processing unit；The vibration signals collecting unit is set on high-voltage shunt reactor, acquires the vibration signal on high-voltage shunt reactor surface, and is sent to the signal processing unit；The signal processing unit carries out time frequency analysis to the vibration signal received, obtains corresponding characteristic value, is then based on the status assessment that the characteristic value carries out high-voltage shunt reactor, obtains condition evaluation results, completes the status monitoring to high-voltage shunt reactor.The present invention is verified by experiments the defects of capable of accurately detecting reactor winding and iron core looseness, and provides a variety of time frequency analysis and state evaluating method, so that the present invention can be with comprehensive comparative analysis, reliability is higher.
Description
Technical field
The invention belongs to on-line monitoring of high-voltage electric equipment technical fields, and in particular to one kind is used for high-voltage shunt reactor
State monitoring apparatus and method.
Background technique
For the reactive compensation and reactive balance, inhibition system overvoltage, raising power quality and confession in enhancing electric system
Electric reliability, high-voltage shunt reactor are widely used in a variety of applications.High-voltage shunt reactor iron core main magnetic circuit is generally configured to band
The structure in gap, and long-term oepration at full load after putting into operation, leakage field is big, and mechanical oscillation are even more serious than transformer, and longtime running holds
The loosening of the components such as coil, iron core (folder), bolt fastener is easily led to, the generation of vibration will be further exacerbated by, when serious also
The defects of may cause equipment over-heat inside, electric discharge, thus be one of important failure cause of reactor.The mechanical vibration of reactor
Dynamic defect is often latency hidden danger, it is difficult to is accurately diagnosed by common electric characteristic parameter.It is in the prior art
The method that the detection means of high-voltage shunt reactor mainly uses oil chromatogram analysis or Partial Discharge Detection, has occurred and that in recent years
It is a lot of to cause chromatography caused by discharging exceeded because reactor internal component loosens, and it is difficult by the method for oil chromatography or partial discharge detection
With it is sensitive, accurate, detect that coil, iron core or fastener such as loosen at the mechanical defect earlier, need to study effective reactance
Device mechanical defect detection method is simultaneously applied to engineering reality.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes a kind of state monitoring apparatus and method for high-voltage shunt reactor, energy
Enough the defects of accurately detecting reactor winding and iron core looseness.
In order to achieve the above technical purposes, reach above-mentioned technical effect, the invention is realized by the following technical scheme:
In a first aspect, the present invention provides a kind of state monitoring apparatus for high-voltage shunt reactor, including what is be connected
Vibration signals collecting unit and signal processing unit；
The vibration signals collecting unit is set on high-voltage shunt reactor, acquires the vibration on high-voltage shunt reactor surface
Signal, and it is sent to the signal processing unit；
Time frequency analysis module in the signal processing unit uses vibration of the suitable Time-Frequency Analysis Method to receiving
Signal carries out time frequency analysis, obtains corresponding characteristic value, is then based on by the state estimation module in signal processing unit described
Characteristic value and suitable state evaluating method carry out the status assessment of high-voltage shunt reactor, obtain condition evaluation results, complete
To the status monitoring of high-voltage shunt reactor.
Preferably, the vibration signals collecting unit includes vibration signal sensor and data acquisition card；
The vibration signal sensor is set on outer surface or the inner surface of the high-voltage shunt reactor, output end
It is connected with the input terminal of the data acquisition card；
The output end of the data acquisition card is connected with the input terminal of the signal processing unit.
Preferably, the time frequency analysis module is handled using the vibration signal that Fourier transform pairs receives, and is obtained
The frequency spectrum of vibration signal, shown in the calculation formula of the frequency spectrum such as formula (1),
In formula, X (k) is the Fourier transformation of input signal, and x (n) is the time domain discrete vibration signal of input, and N is vibration
Signal sampling point sum；
The state estimation module obtains the state characteristic value of high-voltage shunt reactor according to formula (2) using threshold method
A1, and the acquisition condition evaluation results compared with normal condition characteristic value,
Or using neural network according to formula (3) by the state characteristic value A of signal2As input to high-voltage parallel electricity
Anti- device carries out status assessment, obtains condition evaluation results,
A2(k)=X (50k), k=1,2,3 ... 20 } (3).
Preferably, the time frequency analysis module is handled the vibration signal received using wavelet transformation, is shaken
The coefficient of the wavelet decomposition of dynamic signal, shown in the calculation formula of the coefficient of the wavelet decomposition of the vibration signal such as formula (4):
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
In formula, WT (n) is coefficient of wavelet decomposition, and x (n) is the time domain discrete vibration signal of input, and C is transformation matrix, tool
Body expression formula are as follows:
Wherein, blank space 0,
The coefficient of wavelet decomposition for the vibration signal that the state estimation module is exported based on time frequency analysis module is according to formula
(5) the state characteristic value A of signal is obtained3, shape is carried out to high-voltage shunt reactor to realize compared with normal condition characteristic value
State assessment,
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network based on time frequency analysis module is according to public affairs
Formula (6) obtains the state characteristic value A of signal4As neural network input to carry out high-voltage shunt reactor status assessment,
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (6)
In formula, CA (k) is the coefficient of every layer of wavelet transformation decomposition.
Preferably, the state monitoring apparatus for high-voltage shunt reactor further includes display unit and input unit；
The data transmission terminal of the display unit is connected with the data transmission terminal of the signal processing unit, for showing height
Press the condition evaluation results of shunt reactor；
The output end of the input unit is connected with the input terminal of the signal processing unit, for carrying out parameter setting.
It preferably, further include secure log module in the signal processing unit；It is inputted and is instructed using input unit, when defeated
When the instruction entered is identical as the preset instructions value stored in the secure log module, then signal processing unit outputs signal to aobvious
Show unit, carries out condition evaluation results and show.
Second aspect, the present invention provides a kind of state monitoring methods for high-voltage shunt reactor, comprising:
Obtain the vibration signal on high-voltage shunt reactor surface；
Time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, obtains corresponding feature
Value, is then based on the characteristic value and suitable state evaluating method carries out the status assessment of high-voltage shunt reactor, obtains shape
State assessment result completes the status monitoring to high-voltage shunt reactor.
Preferably, described that time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, it obtains
Corresponding characteristic value, the state for being then based on the characteristic value and suitable state evaluating method progress high-voltage shunt reactor are commented
Estimate, obtains condition evaluation results, specifically includes the following steps:
It is handled using the vibration signal that Fourier transform pairs receives, obtains the frequency spectrum of vibration signal, the frequency spectrum
Calculation formula such as formula (1) shown in:
X (n) is the time domain discrete vibration signal of input in formula, and N is the total points of vibration signal sampling, and X (k) is input signal
Fourier transformation；
The frequency for the vibration signal that the state estimation module exports time frequency analysis module according to formula (2) using threshold method
Spectrum carries out obtaining the state characteristic value A of signal1, and the state of high-voltage shunt reactor is assessed, obtain status assessment knot
Fruit,
Or the state characteristic value A of signal will be obtained according to formula (3) using neural network2It realizes as input to height
The status assessment of shunt reactor is pressed,
A2(k)=X (50k), k=1,2,3 ... 20 } (3).
Preferably, described that time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, it obtains
Corresponding characteristic value, the state for being then based on the characteristic value and suitable state evaluating method progress high-voltage shunt reactor are commented
Estimate, obtains condition evaluation results, specifically includes the following steps:
The vibration signal received is handled using wavelet transformation, obtains the coefficient of the wavelet decomposition of vibration signal,
Shown in the calculation formula of the coefficient of the wavelet decomposition of the vibration signal such as formula (4):
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
WT (n) is coefficient of wavelet decomposition in formula, and C is transformation matrix, expression are as follows:
Wherein, blank space 0,
The coefficient of wavelet decomposition of vibration signal based on the output of time frequency analysis module obtains the feature of signal according to formula (5)
Value A3, to carry out status assessment to high-voltage shunt reactor compared with normal condition,
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network based on time frequency analysis module is according to public affairs
Formula (6) obtains the state characteristic value A of signal4As neural network input to carry out high-voltage shunt reactor status assessment,
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (6).
Preferably, a kind of state monitoring method for high-voltage shunt reactor, further includes: to the state of acquisition
Assessment is shown.
Compared with prior art, beneficial effects of the present invention:
1) present invention is verified by experiments the defects of capable of accurately detecting reactor winding and iron core looseness, and provides
A variety of time frequency analysis and state evaluating method, so that the present invention can be with comprehensive comparative analysis, reliability is higher.
2) present invention is light portable, and has good human-computer interaction interface easily operated, while having data storage, from
The various functions such as line analysis, and it is provided with secure log module, the maloperation for having exempted from layman is realized, therefore have
It is scientific and reasonable, good practical effect, high accuracy for examination.
Detailed description of the invention
Fig. 1 is a kind of structure chart of state monitoring apparatus for high-voltage shunt reactor；
Fig. 2 is a kind of flow chart of state monitoring method for high-voltage shunt reactor；
Fig. 3 is reactor characteristic value line chart under different conditions.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
Determine protection scope of the present invention.
Application principle of the invention is explained in detail with reference to the accompanying drawing.
Embodiment 1
As shown in Figs. 1-2, the embodiment of the invention provides a kind of state monitoring apparatus for high-voltage shunt reactor, packets
Include connected vibration signals collecting unit and signal processing unit 3；
The vibration signals collecting unit is set on high-voltage shunt reactor, acquires the vibration on high-voltage shunt reactor surface
Signal, and it is sent to the signal processing unit 3；In the preferred embodiment mode of the embodiment of the present invention, the vibration signal
Acquisition unit includes vibration signal sensor 1 and data acquisition card 2, and the vibration signal sensor 1 is set to the high-voltage parallel
On the outer surface of reactor or inner surface, quantity can be one or more, output end and the data acquisition card 2
Input terminal be connected；The output end of the data acquisition card 2 is connected with the input terminal of the signal processing unit 3；Actually answering
With in the process, the vibration signal sensor 1 can use the piezoelectric acceleration transducer of model CTC AC102-1A, institute
Stating data acquisition card 2 can be selected the data acquisition card 2 of model MPS140801, and sample rate is adjustable by 1K-128K, adopts every time
Sample number is adjustable by 1024-65536, and data are 24；
Time frequency analysis module in the signal processing unit 3 uses vibration of the suitable Time-Frequency Analysis Method to receiving
Signal carries out time frequency analysis, obtains corresponding characteristic value, is then based on by the state estimation module in signal processing unit 3 described
Characteristic value and suitable state evaluating method carry out the status assessment of high-voltage shunt reactor, obtain condition evaluation results, complete
Monitoring to high-voltage shunt reactor；In the preferred embodiment of the embodiment of the present invention, the signal processing unit 3 is by UP
Board board is constituted, which carriesAtomTMX5-Z8350 processor (code name Cherry Trail) is equipped with 4GB
DDR3L RAM and 64GB eMMC has the features such as small in size, performance is high.
The time frequency analysis module is handled using the vibration signal that Fourier transform pairs receives, and obtains vibration signal
Frequency spectrum, the specific process is as follows:
If x (n) is the Discrete signal of input, N is sampling number, and X (k) is the result of x (n) Fourier transformation；
The state estimation module obtains the state characteristic value A of high-voltage shunt reactor according to formula (2)1, with normal shape
Condition evaluation results are obtained after state characteristic value,
Alternatively, the state characteristic value A of signal will be obtained according to formula (3) using neural network2As input realization pair
The status assessment of high-voltage shunt reactor；In the specific implementation, can choose in the neural network BP neural network come into
Row data processing, when BP neural network output be 0, then illustrate that high-voltage shunt reactor is in normal condition, when BP nerve net
The output of network is 1, then illustrates that high-voltage shunt reactor is in abnormal condition,
A2(k)=X (50k), k=1,2,3 ... 20 } (3)
Further, the state monitoring apparatus for high-voltage shunt reactor further includes display unit 4, the display
The data transmission terminal of unit 4 is connected with the data transmission terminal of the signal processing unit 3, for showing high-voltage shunt reactor
Condition evaluation results；In addition, the related setting that the display unit 4 can also be stored, settable single stored duration, interval
Time, storage location and memory channel, the data being defaulted as in Coutinuous store nearly one hour, per the number for choosing one second every other hour
According to and its frequency spectrum permanently store, memory channel number be 5, preservations format be Bin, file name is by identifier+time+sample rate group
At historical data identifier is T, and frequency spectrum F, Recent data identifier is D, and storage location is the storage of UP Board board
Device, according to default setting can Coutinuous store many decades data volume, capacity can also be expanded by external memorizer；Further
Ground further includes secure log module in the signal processing unit 3；Using display unit 4 input instruct, when input instruction with
When the preset instructions value stored in the secure log module is identical, then signal processing unit 3 outputs signal to display unit 4,
It carries out condition evaluation results to show, substantially increases security of system energy.
Further, the state monitoring apparatus for high-voltage shunt reactor further includes input unit 5, the input
The output end of unit 5 is connected with the input terminal of the signal processing unit 3, for carrying out parameter setting；In the embodiment of the present invention
A kind of specific embodiment in, the input unit 5 is the peripheral hardwares such as keyboard, mouse.
Embodiment 2
The embodiment of the present invention the difference from embodiment 1 is that:
The time frequency analysis module is handled the vibration signal received using wavelet transformation, is defaulted as 8 layers of decomposition,
Obtain the coefficient of wavelet decomposition of vibration signal；Specifically includes the following steps:
Wavelet transformation formula are as follows:
Wherein, ψ (t) is wavelet basis function, and a is zoom factor, and τ is shift factor.When use db4 small echo does discrete wavelet
Transformation, shown in the calculation formula of the coefficient of the wavelet decomposition of the vibration signal such as formula (4):
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
Wherein C is transformation matrix, expression are as follows:
Wherein blank space is 0,
The coefficient of wavelet decomposition for the vibration signal that the state estimation module is exported based on time frequency analysis module is according to formula
(6) the state characteristic value A of signal is obtained3, commented compared with normal condition characteristic value to carry out state to high-voltage shunt reactor
Estimate；
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network according to time frequency analysis module is according to public affairs
Formula (7) obtains the state characteristic value A of signal4As neural network input to carry out high-voltage shunt reactor status assessment,
Wherein, neural network needs to train in advance, and trained network model saves as dll format so as to the calling in decision.
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (7)
In formula, WT (n) is the decomposition coefficient that wavelet transformation obtains, including approximation coefficient and detail coefficients, and CA (k) is to obtain
Each layer of decomposition coefficient.
Threshold method is according to the characteristic value of input compared under normal condition, and ratio is bigger to illustrate that failure is more serious, when more
Secondary measurement is continued above some numerical value, and device just issues alarm signal, and the ratio coefficient of default is 1.5.
Embodiment 3
Based on inventive concept same as Example 1, the embodiment of the invention provides one kind to be used for high-voltage shunt reactor
State monitoring method, comprising:
Obtain the vibration signal on high-voltage shunt reactor surface；
Time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, obtains corresponding feature
Value, is then based on the characteristic value and suitable state evaluating method carries out the status assessment of high-voltage shunt reactor, obtains shape
State assessment result completes the monitoring to high-voltage shunt reactor.
In a kind of specific embodiment of the embodiment of the present invention, it is described using suitable Time-Frequency Analysis Method to receiving
Vibration signal carry out time frequency analysis, obtain corresponding characteristic value, be then based on the characteristic value and suitable status assessment side
Method carries out the status assessment of high-voltage shunt reactor, obtains condition evaluation results, specifically includes the following steps:
It is handled using the vibration signal that Fourier transform pairs receives, obtains the frequency spectrum of vibration signal；The frequency spectrum
Calculation formula such as formula (1) shown in:
The state characteristic value A of high-voltage shunt reactor is obtained according to formula (2) using threshold method1, with normal condition feature
Value compares, to obtain condition evaluation results；
Or characteristic value A is obtained according to formula (3) using neural network2(n) as the input of neural network, to obtain
Obtain condition evaluation results,
A2(k)=X (50k), k=1,2,3 ... 20 } (3).
Preferably, described that time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, it obtains
Corresponding characteristic value, the state for being then based on the characteristic value and suitable state evaluating method progress high-voltage shunt reactor are commented
Estimate, obtains condition evaluation results, specifically includes the following steps:
The vibration signal received is handled using wavelet transformation, obtains the coefficient of the wavelet decomposition of vibration signal,
Shown in the calculation formula of the coefficient of the wavelet decomposition of the vibration signal such as formula (4)；
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
WT (n) is coefficient of wavelet decomposition in formula, and C is transformation matrix, expression are as follows:
Wherein blank space is 0,
The state of signal is obtained according to formula (5) according to the coefficient of wavelet decomposition of the vibration signal of time frequency analysis module output
Characteristic value A3, status assessment is carried out to high-voltage shunt reactor compared with normal condition characteristic value；
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network according to time frequency analysis module is according to public affairs
Formula (6) obtains the characteristic value A of signal4Input as neural network is to the status assessment for carrying out high-voltage shunt reactor.
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (6)
Embodiment 4
The difference of the embodiment of the present invention and embodiment 3 is:
In the embodiment of the present invention further include: the state monitoring method for high-voltage shunt reactor further include: to obtaining
The status assessment obtained is shown.
Embodiment 5
As shown in figure 3, being based on embodiment 3, the embodiment of the invention provides a kind of states for high-voltage shunt reactor
Monitoring method, comprising: by positive two measuring points of high-voltage shunt reactor, two measuring points of axial plane vibration signal for, according to reality
It applies formula (2) in example 3 and obtains the characteristic value of signal, it, can be with normal condition characteristic value ratio coefficient as shown in data in Fig. 3 table
When finding out loosening 60%, signal characteristic value is 2 times or so of normal condition, and the characteristic value for loosening 100% is 20 times of normal condition
Left and right can realize the judgement to reactor current state by the way that suitable threshold value is arranged.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (10)
1. a kind of state monitoring apparatus for high-voltage shunt reactor, it is characterised in that: including connected vibration signals collecting
Unit and signal processing unit；
The vibration signals collecting unit is set on high-voltage shunt reactor, the vibration letter on acquisition high-voltage shunt reactor surface
Number, and it is sent to the signal processing unit；
Time frequency analysis module in the signal processing unit is using suitable Time-Frequency Analysis Method to the vibration signal received
Time frequency analysis is carried out, corresponding characteristic value is obtained, the feature is then based on by the state estimation module in signal processing unit
Value and suitable state evaluating method carry out the status assessment of high-voltage shunt reactor, obtain condition evaluation results, complete to height
Press the status monitoring of shunt reactor.
2. a kind of state monitoring apparatus for high-voltage shunt reactor according to claim 1, it is characterised in that: described
Vibration signals collecting unit includes vibration signal sensor and data acquisition card；
The vibration signal sensor is set on outer surface or the inner surface of the high-voltage shunt reactor, output end and institute
The input terminal for stating data acquisition card is connected；
The output end of the data acquisition card is connected with the input terminal of the signal processing unit.
3. a kind of state monitoring apparatus for high-voltage shunt reactor according to claim 1, it is characterised in that: described
Time frequency analysis module is handled using the vibration signal that Fourier transform pairs receives, and obtains the frequency spectrum of vibration signal, described
Shown in the calculation formula of frequency spectrum such as formula (1),
In formula, X (k) is the Fourier transformation of input signal, and x (n) is the time domain discrete vibration signal of input, and N is vibration signal
Total number of sample points；
The state estimation module obtains the state characteristic value A of high-voltage shunt reactor according to formula (2) using threshold method1, and with
Normal condition characteristic value compares acquisition condition evaluation results,
Or using neural network according to formula (3) by the state characteristic value A of signal2As input to high-voltage shunt reactor
Status assessment is carried out, condition evaluation results are obtained,
A2(k)=X (50k), k=1,2,3 ... 20 } (3).
4. a kind of state monitoring apparatus for high-voltage shunt reactor according to claim 1, it is characterised in that: described
Time frequency analysis module is handled the vibration signal received using wavelet transformation, and obtain the wavelet decomposition of vibration signal is
Number, shown in the calculation formula of the coefficient of the wavelet decomposition of the vibration signal such as formula (4):
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
In formula, WT (n) is coefficient of wavelet decomposition, and x (n) is the time domain discrete vibration signal of input, and C is transformation matrix, specific table
Up to formula are as follows:
Wherein, blank space 0,
The coefficient of wavelet decomposition for the vibration signal that the state estimation module is exported based on time frequency analysis module is obtained according to formula (5)
To the state characteristic value A of signal3, realize that carrying out state to high-voltage shunt reactor comments compared with normal condition characteristic value
Estimate,
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network based on time frequency analysis module is according to formula (6)
Obtain the state characteristic value A of signal4As neural network input to carry out high-voltage shunt reactor status assessment,
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (6)
In formula, CA (k) is the coefficient of every layer of wavelet transformation decomposition.
5. a kind of state monitoring apparatus for high-voltage shunt reactor according to claim 1, it is characterised in that: described
State monitoring apparatus for high-voltage shunt reactor further includes display unit and input unit；
The data transmission terminal of the display unit is connected with the data transmission terminal of the signal processing unit, for showing high pressure simultaneously
Join the condition evaluation results of reactor；
The output end of the input unit is connected with the input terminal of the signal processing unit, for carrying out parameter setting.
6. a kind of state monitoring apparatus for high-voltage shunt reactor according to claim 5, it is characterised in that: described
It further include secure log module in signal processing unit；It is inputted and is instructed using input unit, when the instruction and the safety of input
When the preset instructions value stored in login module is identical, then signal processing unit outputs signal to display unit, and carry out state is commented
Estimate as the result is shown.
7. a kind of state monitoring method for high-voltage shunt reactor characterized by comprising
Obtain the vibration signal on high-voltage shunt reactor surface；
Time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, obtains corresponding characteristic value, so
The status assessment for carrying out high-voltage shunt reactor based on the characteristic value and suitable state evaluating method afterwards, obtains status assessment
As a result, completing the status monitoring to high-voltage shunt reactor.
8. a kind of state monitoring method for high-voltage shunt reactor according to claim 7, it is characterised in that: described
Time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, obtains corresponding characteristic value, then base
The status assessment of high-voltage shunt reactor is carried out in the characteristic value and suitable state evaluating method, obtains status assessment knot
Fruit, specifically includes the following steps:
It is handled using the vibration signal that Fourier transform pairs receives, obtains the frequency spectrum of vibration signal, the meter of the frequency spectrum
It calculates shown in formula such as formula (1):
X (n) is the time domain discrete vibration signal of input in formula, and N is the total points of vibration signal sampling, and X (k) is Fu of input signal
In leaf transformation；
The frequency spectrum for the vibration signal that the state estimation module exports time frequency analysis module according to formula (2) using threshold method into
Row obtains the state characteristic value A of signal1, and the state of high-voltage shunt reactor is assessed, condition evaluation results are obtained,
Or the state characteristic value A of signal will be obtained according to formula (3) using neural network2It is realized to high pressure simultaneously as input
Join the status assessment of reactor,
A2(k)=X (50k), k=1,2,3 ... 20 } (3).
9. a kind of state monitoring method for high-voltage shunt reactor according to claim 7, it is characterised in that: described
Time frequency analysis is carried out to the vibration signal received using suitable Time-Frequency Analysis Method, obtains corresponding characteristic value, then base
The status assessment of high-voltage shunt reactor is carried out in the characteristic value and suitable state evaluating method, obtains status assessment knot
Fruit, specifically includes the following steps:
The vibration signal received is handled using wavelet transformation, obtains the coefficient of the wavelet decomposition of vibration signal, it is described
Shown in the calculation formula of the coefficient of the wavelet decomposition of vibration signal such as formula (4):
WT (n)=C*x (n), n={ 0,1,2...N-1 } (4)
WT (n) is coefficient of wavelet decomposition in formula, and C is transformation matrix, expression are as follows:
Wherein, blank space 0,
The coefficient of wavelet decomposition of vibration signal based on the output of time frequency analysis module obtains the characteristic value A of signal according to formula (5)3,
To carry out status assessment to high-voltage shunt reactor compared with normal condition,
Or the coefficient of wavelet decomposition of the vibration signal exported using neural network based on time frequency analysis module is according to formula (6)
Obtain the state characteristic value A of signal4As neural network input to carry out high-voltage shunt reactor status assessment,
A4(n)=maxCA (1), maxCA (2) ..., maxCA (8) } (6).
10. a kind of state monitoring method for high-voltage shunt reactor according to claim 7, it is characterised in that: also
It include: to be shown to the status assessment of acquisition.
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Cited By (4)
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| CN110441632A (en) * | 2019-08-01 | 2019-11-12 | 河海大学 | Portable high-pressure shunt reactor fault detection means and method |
| CN111024347A (en) * | 2019-12-26 | 2020-04-17 | 华中科技大学 | Reactor health state assessment method |
| CN111638028A (en) * | 2020-05-20 | 2020-09-08 | 国网河北省电力有限公司电力科学研究院 | High-voltage parallel reactor mechanical state evaluation method based on vibration characteristics |
| CN113536969A (en) * | 2021-06-25 | 2021-10-22 | 国网电力科学研究院武汉南瑞有限责任公司 | Defect diagnosis method and system for high-voltage reactor |
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