CN104215203A - Ultrasonic-based transformer winding deformation online detection method and system - Google Patents
Ultrasonic-based transformer winding deformation online detection method and system Download PDFInfo
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Abstract
The invention discloses an ultrasonic-based transformer winding deformation online detection method and system. The method includes 1, selecting a detected point, and allowing an ultrasonic emitting probe to emit ultrasonic signals; 2, allowing the ultrasonic signals to transmit into a transformer; 3, allowing an ultrasonic receiving probe to receive echo signals and convert into echo electrical signals; 4, optimizing the echo electrical signals; 5, calculating the transmitting time of the ultrasonic signals inside the transformer according to the optimized echo electrical signals; 6, performing receive compensation on the transmitting paths of the ultrasonic in the transformer, and acquiring the distance from the detected point to the housing of the transformer; 7, moving the ultrasonic probe on the housing of the transformer to a next detected point, and repeating the step 1 to step 6; S8, after detecting all detected points, processing data, and giving a transformer winding deformation diagnosis report. By the aid of the method, transformer winding deformation online detection is implemented, and the method is easy to apply to the reality.
Description
Technical field
The invention belongs to power information detection technique field, it relates to a kind of based on hyperacoustic deformation of transformer winding online test method.
Background technology
Power transformer is important and expensive, due to the powerful electrodynamic effect of accident collision or system short-circuit fault in transportation, may damage immediately, but generally winding deformation to a certain degree only occur, now as found not in time and repairing distortion, electric power system fault may be caused.After deformation of transformer winding, the accident that is damaged immediately had, what have then still can run for a long time.The transformer that winding has deformed often can continue to run within the long duration, and as do not obtained in good time maintenance, cumulative effect can further develop, even if no longer there is short circuit accident, transformer also can be caused out of service abnormally.Correct deformation detection timely can ensure that transformer fault element is replaced timely, and non-fault element is used to greatest extent, thus extends the actual life of transformer.
The research detected about Transformer Winding limit shape in recent years gets more and more, and proposes a large amount of detection methods.Because China's Electrical Transformer drops into the quantity of electrical network constantly in increase, traditional off-line checking method has been difficult to meet the demands.Traditional short circuit impedance method, Low Voltage Impulse Method, Frequency Response Analysis method achieve some effects in the detection of winding deformation, but these classic methods all also exist can not on-line checkingi, sensitivity is poor, and antijamming capability is lower, and data acquisition difficulty waits shortcomings.
Summary of the invention
The object of the present invention is to provide a kind of based on hyperacoustic deformation of transformer winding online test method, can not the problem of on-line checkingi to solve existing deformation of transformer winding.
The second object of the present invention is to provide a kind of based on hyperacoustic deformation of transformer winding online test method, can not Timeliness coverage to solve existing deformation of transformer winding, so that the problem that can not in good time keep in repair.
The third object of the present invention is to provide a kind of problems such as there is sensitivity difference to solve existing deformation of transformer winding detection method, antijamming capability is lower based on hyperacoustic deformation of transformer winding online test method, data acquisition difficulty.
For achieving the above object, the invention provides a kind of based on hyperacoustic deformation of transformer winding online test method, comprise the following steps:
S1: a selected measured point on transformer case, launches ultrasonic signal, and starts timing;
S2: the echoed signal receiving described ultrasonic signal, and change into electric echo signal;
S3: process is optimized to described electric echo signal, and stops timing;
S4: carry out reception to ultrasonic wave propagation path and compensate, calculates measured point apart from transformer case distance;
S5: find next measured point, repeats S1-S4;
S6: after testing whole measured point, process range data, provides deformation of transformer winding diagnosis report.
Preferably, described step S1 comprises further: produce high frequency square wave pulse by a high-frequency oscillating circuits, and described high frequency square wave pulse launches ultrasonic signal by exciting circuit excitation ultrasound wave transmitting probe.
Preferably, described step S1 comprises further: produce high-frequency oscillation signal by self-maintained circuit and encourage piezoelectric chip, produce described high frequency square wave pulse, makes described ultrasound wave transmitting probe launch the ultrasound wave of corresponding frequencies.
Preferably, described step S1 comprises further: with reference to the modulator approach of ultrasonic communication, obtain a special oscillator signal by the mode changing waveform dutycycle, the described echoed signal that described ultrasound wave receiving transducer is received is obviously different from the waveform of undesired signal.
Preferably, described step S1 comprises further: adopt the soft probe of low frequency and ultrasonic wave-coupled agent to remove thin layer of air, make described ultrasonic signal spread into inside transformer smoothly.
Preferably, described step S2 comprises further: receive echoed signal by ultrasound wave receiving transducer, and be converted into electric echo signal.
Preferably, described step S3 specifically comprises: first, carries out amplification filtering process to described electric echo signal, exports amplified filtered signal; Secondly, described amplified filtered signal is carried out time gain compensation or compare the optimization process of shaping, and export the signal of optimization process; Finally, timing is stopped after optimization process.
Preferably, described step S3 comprises further: when carrying out time gain compensation, calculates decibels sound intensity gain being reduced because of absorption; Through the relation of the time of this distance, gain compensation is carried out to the echoed signal decayed according to the ultrasound wave decibels that amplitude reduces in propagation distance and ultrasound wave, make the echoed signal wave recovery of reception, and secondary amplification is carried out to the signal of wave recovery.
Preferably, described step S4 comprises further: after stopping timing, obtains ultrasonic propagation time; Measuring tempeature, calculates the current velocity of sound according to this temperature value, carries out temperature compensation according to the current velocity of sound and travel-time.
Preferably, described step S4 specifically comprises: according to launching the distance of ultrasonic signal position apart from the distance transformer case center, position of the distance calculating reception echoed signal of transformer case center, adjustment receives the position of echoed signal, and according to the Time Calculation measured point of timing apart from transformer case distance.
Present invention also offers a kind of based on hyperacoustic deformation of transformer winding on-line detecting system, comprise single-chip microcomputer, transmitting probe, receiving transducer, signal optimizing module, temperature-compensation circuit and timer;
Described ultrasound wave transmitting probe sends ultrasonic signal, and described in described Single-chip Controlling, timer starts timing simultaneously; Described ultrasound wave receiving transducer receives the echoed signal of described ultrasonic signal, and echoed signal is converted into electric echo signal output; Described signal optimizing module exports after being optimized process to described electric echo signal optimizes echoed signal to described single-chip microcomputer, and described in described Single-chip Controlling, timer stops timing simultaneously, and timer exports timing signal; Described temperature-compensation circuit measuring tempeature, and temperature signal is inputted described single-chip microcomputer;
Described single-chip microcomputer receives described temperature signal, timing signal and optimizes echoed signal, according to described temperature signal, timing signal, carries out temperature compensation to the travel path of described optimization echoed signal, calculates measured point apart from transformer case distance.
Preferably, also comprise power driving circuit, described power driving circuit comprises high-frequency oscillating circuits, exciting circuit and single chip microcomputer driving circuit; Described high-frequency oscillating circuits is for generation of high frequency square wave pulse, and described exciting circuit is used under high frequency square wave pulse action, encourage described transmitting probe to launch ultrasonic signal; Described single chip microcomputer driving circuit is for driving described single-chip microcomputer.
Preferably, described signal optimizing module comprises time gain compensation circuit, second amplifying circuit and compares shaping circuit;
Described time gain compensation circuit is provided with first threshold, the described shaping circuit that compares is provided with Second Threshold, the echoed signal of described first threshold for selecting transmission range to be greater than certain distance, the echoed signal of described Second Threshold for selecting transmission range to be less than this certain distance;
When echoed signal does not meet described Second Threshold, described amplified filtered signal inputs output time gain compensation signal after described time gain compensation processing of circuit, exports secondary amplifying signal to described single-chip microcomputer after the process of described time gain compensation signal input second amplifying circuit;
When echoed signal does not meet described first threshold, the input of described amplified filtered signal is described compare shaping circuit process after export and compare reshaping signal to described single-chip microcomputer.
The invention discloses based on hyperacoustic deformation of transformer winding online test method and system, there is testing process not by electromagnetic interference (EMI), reflection winding deformation position directly perceived and degree, can under running state of transformer the series of advantages such as real-time detection.
Compared with prior art, beneficial effect of the present invention is as follows:
The first, what present invention achieves Transformer Winding shape does not shut down on-line monitoring.By adopting ultrasonic ranging, ultrasonic signal can not disturb electric signal, and electric signal also can not affect hyperacoustic range finding, makes need not close transformer when measuring, thus does not affect its normal transformation work, and antijamming capability is higher.
The second, the present invention can judge the particular location of deformation of transformer winding intuitively.By adopting the distance of scanning survey transformer case surface each point distance Transformer Winding, form the data report of one group of transformer case to Transformer Winding distance, can directly compare with the corresponding data of non-transformer, the deformation drawing current transformer winding can be analyzed, data acquisition is easy, and data report is visual and understandable.
3rd, the present invention is easy to apply in Practical Project.Adopt based on hyperacoustic deformation of transformer winding on-line detecting system, its ultrasonic probe sends and Received signal strength, by single-chip microcomputer and accordingly other signal processing circuits can complete range observation work, sensitivity is higher, easy to operate and use, be applicable to large-scale promotion in the operation of actual deformation of transformer winding detection.
Accompanying drawing explanation
Fig. 1 is a kind of process flow diagram based on hyperacoustic deformation of transformer winding online test method of the present invention;
Fig. 2 is deformation of transformer winding on-line detecting system composition frame chart of the present invention;
Fig. 3 Transformer Winding fundamental measurement situation schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described, but enforcement of the present invention and protection domain are not limited thereto:
Provide a kind of based on hyperacoustic deformation of transformer winding on-line detecting system in the present embodiment, as shown in Figure 2, comprise single-chip microcomputer, transmitting probe, receiving transducer, signal optimizing module, temperature-compensation circuit and timer;
During work, first drive ultrasound wave transmitting probe to send ultrasonic signal by power driving circuit, power driving circuit comprises high-frequency oscillating circuits, exciting circuit and single chip microcomputer driving circuit; High-frequency oscillating circuits produces high frequency square wave pulse, and exciting circuit stimulated emission probe under high frequency square wave pulse action launches ultrasonic signal; Single chip microcomputer driving circuit drives single-chip microcomputer to start working simultaneously, and timing by Single-chip Controlling timer.
Secondly, ultrasound wave receiving transducer receives the echoed signal of the ultrasonic signal sent, and echoed signal is converted into electric echo signal output; Signal optimizing module is optimized process to electric echo signal: signal optimizing module comprises time gain compensation circuit, second amplifying circuit and compares shaping circuit;
Time gain compensation circuit is provided with first threshold, relatively shaping circuit is provided with Second Threshold, in the present embodiment, the echoed signal of first threshold for selecting transmission range to be greater than 50cm of time gain compensation circuit, namely the signal being less than 50cm can by automatic rejection, and the amplified filtered signal being now less than 50cm enters single-chip microcomputer through comparing shaping circuit; The relatively echoed signal of Second Threshold for selecting transmission range to be less than 50cm of shaping circuit, namely the signal being greater than 50cm cannot be able to be received by automatic rejection owing to decaying more, and the signal being now greater than 50cm can enter single-chip microcomputer via time gain compensation circuit and second amplifying circuit.
Wherein, output time gain compensation signal after the process of amplified filtered signal gain compensation circuit input time, exports secondary amplifying signal as optimization echoed signal to single-chip microcomputer after the process of time gain compensation signal input second amplifying circuit; Export after shaping circuit process is compared in amplified filtered signal input and compare reshaping signal as optimization echoed signal to single-chip microcomputer.
After single-chip microcomputer receives and optimizes echoed signal, control timer stops timing, and timer exports timing signal to single-chip microcomputer; Simultaneous temperature compensating circuit measuring tempeature, and temperature signal is inputted single-chip microcomputer.
Single-chip microcomputer receives temperature signal, timing signal and optimizes echoed signal, carries out temperature compensation according to temperature signal, timing signal to the travel path optimizing echoed signal, calculates measured point apart from transformer case distance.
The present embodiment also provides a kind of based on hyperacoustic deformation of transformer winding online test method, and referring to Fig. 1, the method comprises the following steps:
S1: a selected measured point, ultrasound wave transmitting probe launches ultrasonic signal.
Power driving circuit produces high frequency square wave pulse by a high-frequency oscillating circuits, and high frequency square wave pulse launches ultrasonic signal by exciting circuit excitation ultrasound wave transmitting probe again.Wherein, a self-maintained circuit and a piezoelectric chip is comprised in this high-frequency oscillating circuits, self-maintained circuit produces high-frequency oscillation signal and encourages this piezoelectric chip, produce above-mentioned high frequency square wave pulse, high frequency square wave pulse is carried on ultrasound wave transmitting probe and makes it launch the ultrasound wave of corresponding frequencies.Power driving circuit drives single-chip microcomputer startup timer to start to carry out timing simultaneously.
With reference to the modulator approach of ultrasonic communication, obtain a special oscillator signal by the mode changing waveform dutycycle, the described echoed signal that described ultrasound wave receiving transducer is received is obviously different from the waveform of undesired signal, is convenient to reception.
In the present embodiment, the modulator approach of ultrasonic communication is basic binary digital signal modulator approach, as 2ASK, 2FSK or 2PSK, the method correspondingly changing signal waveform dutycycle shifts gears with reference to general 2ASK, 2FSK or 2PSK signal waveform dutycycle, sends ultrasonic pulse signal after modulation.
S2: described ultrasonic signal propagation is entered inside transformer.
Adopt the soft probe of low frequency and ultrasonic wave-coupled agent to remove thin layer of air, make ultrasonic signal spread into inside transformer smoothly.
The soft probe diaphragm of low frequency adopts rubber mantle, can contact more closely with testee surface, ultrasonic probe is not stressed when contacting transformer case impact, thus its parameter such as impedance, direct capacitance is unaffected.In addition, ultrasonic wave-coupled agent is used to remove thin layer of air.During measurement, ultrasonic wave-coupled agent is filled in probe and detected workpiece contact layer in the middle of, air layer in surface of contact between ultrasonic probe and measured workpiece is supplanted, makes ultrasonic probe can transmit and receive ultrasound wave by measured workpiece smoothly.
In the present embodiment, ultrasonic wave-coupled agent is transformer oil.
S3: ultrasound wave receiving transducer receives echoed signal, and changes into electric echo signal.
The echo pulse signal that ultrasound wave receiving transducer receiving transformer winding reflects, and by ultrasound wave receiving transducer, ultrasonic echo signal is converted to electric echo signal, electric echo signal is the signal of impulse form.
S4: process is optimized to described electric echo signal.
First, filter amplification circuit is adopted to be optimized process to electric echo signal: to adopt one-level filtering and amplifying circuit to carry out filter and amplification, export amplified filtered signal.Because ultrasound wave echoed signal in the process propagated can reduce along with the increase of distance and be mixed with clutter, therefore need to carry out amplification filtering, in the present embodiment, one-level filtering and amplifying circuit adopts NE5532 to carry out amplifying signal.NE5532 is the operational amplifier of a double operational, high-performance, low noise, and most standard of comparing amplifier, demonstrates better noiseproof feature, has quite high small signal bandwidth and power supply bandwidth.
Secondly, the ultrasonic echo signal entry time gain compensation circuit that transmission range is greater than 50cm carries out gain compensation:
The more serious echoed signal of the decline be reflected back Transformer Winding by time gain compensation circuit is amplified.
Owing to can produce relaxation phenomenon when ultrasound wave is propagated in atmosphere, namely the sound intensity can reduce with the increase of propagation distance, therefore needs to compensate the signal of decay.If the initial sound intensity is I
0, after x distance, due to attenuation by absorption, the sound intensity becomes I, then hyperacoustic absorption can represent with formula (1):
I＝I
0e
-αx (1)
In formula, α is air attenuation coefficient.
From above formula, when ultrasound wave is propagated in atmosphere, along with the increase of propagation distance, its gross energy weakens gradually, and its rule is exponentially form decay.Therefore, echo-pulse amplitude in different distance, because its sound path is different, the degree of absorption caused is also different, make the widely different of echo-pulse amplitude, owing to usually adopting comparator circuit in echo pulse signal process, echo-pulse (shape is bell) is made comparisons with the reference voltage that fixes, echo-pulse is shaped as square wave; Because the echo-pulse amplitude difference of different distance is comparatively large, echo produces uncertain time of arrival, causes measuring error to produce.
If pop one's head in the ultrasound wave sent, arrive certain reflecting surface through x distance, Bing Jingyuan road returns, and its incidence sound intensity levels and the reflection sound intensity are I respectively
iand I
r, can be obtained by formula (1):
I
r＝I
ie
-αax (2)
Therefrom can find out, the decibels (dB) sound intensity gain L being reduced because of absorbing is:
L＝4.3×2αx＝4.3αct (4)
In formula, c is the aerial velocity of propagation of sound wave, and t is the time experienced in communication process.Because air attenuation coefficient α, velocity of propagation c all can determine, can prove thus: the ultrasound wave decibels that amplitude reduces in x propagation distance is directly proportional to the time t of ultrasound wave through this distance.Thus, gain compensation must be carried out to the echo in decay.According to formula (4), the gain G received can be directly proportional to echo time t, or gain G and echo time t exponentially increase relation, the amplitude of compensate for attenuation.The signal finally making receiver receive remains unchanged.
This time gain compensation mode specific implementation process is:
1) gain amplifier corresponding with certain distance obtained by experiment is converted into the tap position of digital regulation resistance;
2) these location parameters are cured in Flash;
3) in measuring process, single-chip microcomputer obtains corresponding gain by lookup table mode, then arranges corresponding gain by serial.
After determining receiving gain, loaded on the received signals, get final product restoring signal waveform, output time gain compensation signal is to second amplifying circuit, and second amplifying circuit carries out exporting secondary amplifying signal to single-chip microcomputer after secondary amplifies to time gain compensation signal.
The ultrasonic echo signal that transmission range is less than 50cm enters and compares shaping circuit and compare shaping, exports and compares reshaping signal to single-chip microcomputer.
S5: calculate the travel-time of ultrasonic signal in inside transformer according to the electric echo signal of optimization process.
Secondary amplifying signal or compare reshaping signal input single-chip microcomputer rear drive Single-chip Controlling timer and stop timing, obtains timing signal and is also transferred to single-chip microcomputer, obtain ultrasonic propagation time thus.
Measure the temperature of described ultrasonic wave-coupled agent, calculate the current velocity of sound according to this temperature value, according to the current velocity of sound, temperature compensation is carried out to the travel-time.
Be the process calculating the velocity of sound under Current Temperatures during temperature compensation, specifically carry out according to following formula:
V
t＝V
0+α(T-T
0) (5)
Wherein V
tbe velocity of sound when temperature is T, T
0for standard temperature, V
0expression temperature is T
0time the velocity of sound, α is temperature coefficient.Accordingly, t in transformer oil in the present embodiment
0=20 DEG C, V
0=1923m/s, α=-1.8m/s DEG C.Then relevant parameter is brought among formula (5) and can convert to the velocity of sound, and then temperature compensation is carried out to ultrasonic propagation time.
S6: in the path that inside transformer is propagated, reception is carried out to ultrasound wave and compensates, and then obtain measured point apart from transformer case distance;
Calculate the distance of receiving transducer apart from transformer case center according to receiving transducer apart from transformer case center position, and place described receiving transducer reception echoed signal.
Fig. 3 reflects the basic measurement situation of high-pressure side winding.Incident ultrasound wave and Transformer Winding normal have certain angle as seen from the figure, and the return route of echo not returns along former road, need the echo carrying out the reflection of receiving transformer winding with the receiving transducer settled separately in addition.
Calculate and show that the ultrasonic wave propagation path that the refraction of ultrasonic signal in transformer case causes changes negligible.Then set receiving transducer distance center position as z, make O
3a
2=x, namely transmitting probe is x apart from center position, then have
A
1P＝d
1+R-Rcosθ
1 (7)
Receiving transducer placement location is
A
2B
2＝(A
1P+d
2)arctan(θ
2+θ
3) (8)
z
1＝O
3B
2＝O
2A
1+A
2B
2 (9)
Composite type (6), (7), (8), (9) then have
Codomain according to the known arctan function of trigonometric function exists, and therefore, its value is enough little compared with the parameters such as x can ignore even.
If have ignored the thickness of steel plate, then have
After determining winding measurement point, then pass through the riding position of the known ultrasound wave receiving transducer of (11) formula.
The riding position of the receiving transducer of travel-time of the ultrasonic signal that single-chip microcomputer obtains according to step S5, velocity of propagation and calculating, can obtain measured point apart from transformer case distance.
S7: move ultrasonic probe to next measured point at transformer case, repeats S1-S6, carries out next group DATA REASONING.
S8: after testing whole measured point, processes whole measured points data, provides deformation of transformer winding diagnosis report.
In the present embodiment, real transformer winding is intercepted one section, be placed in the steel plate box interior formation transformer model filling transformer oil, the layout of this transformer model is substantially identical with real transformer.With deformation of transformer winding ultrasonic testing system model machine provided by the invention, transformer model is tested.During test, with winding upper end for reference position slowly moves down along the longitudinal direction at equal intervals, often a mobile interval is just measured once, until longitudinally surveyed a line, then by ultrasonic probe translation interval in the horizontal direction, longitudinally slowly move downwards and the complete longitudinal each point of point-to-point measurement from winding upper end again, the like, ultrasonic probe has swept winding all surfaces, the data of the relative tank body of oil tank surface distance of winding surface each point can be obtained, these data, through computer disposal, finally provide transformer winding state examining report.
Table 1 deformation of transformer winding measurement data
From table 1, utilize ultrasonic method to measure transformer and not only there is very high resolution characteristic, and degree of accuracy is high, winding deformation can be detected exactly.
Certainly, in the inventive method implementation process, be not limited with above-described embodiment, as transformer coupled dose can not affect transformer performance and be beneficial to the medium of Acoustic Wave Propagation, filtering and amplifying circuit that filtering and amplifying circuit also can mate with the method for other performances etc. for other.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those skilled in the art is in the technical scope that the present invention discloses; the distortion do the present invention or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (13)
1., based on a hyperacoustic deformation of transformer winding online test method, it is characterized in that, comprise the following steps:
S1: a selected measured point on transformer case, launches ultrasonic signal, and starts timing;
S2: the echoed signal receiving described ultrasonic signal, and change into electric echo signal;
S3: process is optimized to described electric echo signal, and stops timing;
S4: carry out reception to ultrasonic wave propagation path and compensate, calculates measured point apart from transformer case distance;
S5: find next measured point, repeats S1-S4;
S6: after testing whole measured point, process range data, provides deformation of transformer winding diagnosis report.
2. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S1 comprises further:
Produce high frequency square wave pulse by a high-frequency oscillating circuits, described high frequency square wave pulse launches ultrasonic signal by exciting circuit excitation ultrasound wave transmitting probe.
3. one according to claim 2 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S1 comprises further:
Produce high-frequency oscillation signal by self-maintained circuit to encourage piezoelectric chip, produce described high frequency square wave pulse, make described ultrasound wave transmitting probe launch the ultrasound wave of corresponding frequencies.
4. one according to claim 3 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S1 comprises further: with reference to the modulator approach of ultrasonic communication, obtain a special oscillator signal by the mode changing waveform dutycycle, the described echoed signal that described ultrasound wave receiving transducer is received is obviously different from the waveform of undesired signal.
5. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S1 comprises further:
Adopt the soft probe of low frequency and ultrasonic wave-coupled agent to remove thin layer of air, make described ultrasonic signal spread into inside transformer smoothly.
6. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S2 comprises further: receive echoed signal by ultrasound wave receiving transducer, and be converted into electric echo signal.
7. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S3 specifically comprises: first, carries out amplification filtering process to described electric echo signal, exports amplified filtered signal; Secondly, described amplified filtered signal is carried out time gain compensation or compare the optimization process of shaping, and export the signal of optimization process; Finally, timing is stopped after optimization process.
8. one according to claim 7 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S3 comprises further: when carrying out time gain compensation, calculates decibels sound intensity gain being reduced because of absorption; Through the relation of the time of this distance, gain compensation is carried out to the echoed signal decayed according to the ultrasound wave decibels that amplitude reduces in propagation distance and ultrasound wave, make the echoed signal wave recovery of reception, and secondary amplification is carried out to the signal of wave recovery.
9. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S4 comprises further: after stopping timing, obtains ultrasonic propagation time; Measuring tempeature, calculates the current velocity of sound according to this temperature value, carries out temperature compensation according to the current velocity of sound and travel-time.
10. one according to claim 1 is based on hyperacoustic deformation of transformer winding online test method, it is characterized in that, described step S4 specifically comprises:
According to launching the distance of ultrasonic signal position apart from the distance transformer case center, position of the distance calculating reception echoed signal of transformer case center, adjustment receives the position of echoed signal, and according to the Time Calculation measured point of timing apart from transformer case distance.
11. 1 kinds, based on hyperacoustic deformation of transformer winding on-line detecting system, is characterized in that, comprise single-chip microcomputer, transmitting probe, receiving transducer, signal optimizing module, temperature-compensation circuit and timer;
Described ultrasound wave transmitting probe sends ultrasonic signal, and described in described Single-chip Controlling, timer starts timing simultaneously; Described ultrasound wave receiving transducer receives the echoed signal of described ultrasonic signal, and echoed signal is converted into electric echo signal output; Described signal optimizing module exports after being optimized process to described electric echo signal optimizes echoed signal to described single-chip microcomputer, and described in described Single-chip Controlling, timer stops timing simultaneously, and timer exports timing signal; Described temperature-compensation circuit measuring tempeature, and temperature signal is inputted described single-chip microcomputer;
Described single-chip microcomputer receives described temperature signal, timing signal and optimizes echoed signal, according to described temperature signal, timing signal, carries out temperature compensation to the travel path of described optimization echoed signal, calculates measured point apart from transformer case distance.
12. according to claim 11ly is characterized in that based on hyperacoustic deformation of transformer winding on-line detecting system, also comprise power driving circuit, and described power driving circuit comprises high-frequency oscillating circuits, exciting circuit and single chip microcomputer driving circuit; Described high-frequency oscillating circuits is for generation of high frequency square wave pulse, and described exciting circuit is used under high frequency square wave pulse action, encourage described transmitting probe to launch ultrasonic signal; Described single chip microcomputer driving circuit is for driving described single-chip microcomputer.
13. according to claim 11ly is characterized in that based on hyperacoustic deformation of transformer winding on-line detecting system, and described signal optimizing module comprises time gain compensation circuit, second amplifying circuit and compares shaping circuit;
Described time gain compensation circuit is provided with first threshold, the described shaping circuit that compares is provided with Second Threshold, the echoed signal of described first threshold for selecting transmission range to be greater than certain distance, the echoed signal of described Second Threshold for selecting transmission range to be less than this certain distance;
When echoed signal does not meet described Second Threshold, described amplified filtered signal inputs output time gain compensation signal after described time gain compensation processing of circuit, exports secondary amplifying signal to described single-chip microcomputer after the process of described time gain compensation signal input second amplifying circuit;
When echoed signal does not meet described first threshold, the input of described amplified filtered signal is described compare shaping circuit process after export and compare reshaping signal to described single-chip microcomputer.
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