CN106645404B - High-tension switch gear disc insulator curing degree lossless detection method and device - Google Patents
High-tension switch gear disc insulator curing degree lossless detection method and device Download PDFInfo
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- CN106645404B CN106645404B CN201611047494.4A CN201611047494A CN106645404B CN 106645404 B CN106645404 B CN 106645404B CN 201611047494 A CN201611047494 A CN 201611047494A CN 106645404 B CN106645404 B CN 106645404B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
Abstract
The present invention relates to a kind of high-tension switch gear disc insulator curing degree lossless detection method and device, lossless detection method therein includes: to emit ultrasonic pulse to insulator to be measured；Obtain insulator bottom surface ultrasonic reflections signal to be measured；Fast Fourier Transform (FFT) is carried out to ultrasonic reflections signal, calculates the power spectrum of ultrasonic reflections signal；The peak value of power spectrum is compared with relationship library, and then obtains the curing degree of insulator to be measured；The relationship library is the corresponding relationship by carrying out insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal that ultrasonic test obtains to the different insulator test product of various curing degrees.This method can effectively realize the non-destructive testing of disc insulator integrally curing degree.
Description
Technical field
The present invention relates to a kind of high-tension switch gear disc insulator curing degree lossless detection method and device, belong to absolutely
Edge material NDT and NDE technical field.
Background technique
Disc insulator is one of key components and parts of high-tension switch gear, plays the weights such as insulation, support and segmentation gas chamber
It acts on, performance will directly determine the insulation performance and operational reliability of switchgear.As network voltage grade is to extra-high
Pressure direction is developed, and high-tension switch gear disc insulator size constantly increases, to the requirement of its voltage endurance capability in operational process
It is higher and higher.Large-scale disc insulator production technology is complicated, and the production cycle is long, and electrical and mechanical properties require high.Benzvalene form insulation
Son is chronically under the synergy of high voltage electric field and complicated stress field inside high-tension switch gear, to bear SF6 gas pressure
The mechanical functions such as power, the static pressure of the impact force in switchgear interrupting process, center conductor and other component.Voltage endurance capability is
The comprehensive of disc insulator mechanical performance embodies, insulator insufficient for voltage endurance capability, the meeting when bearing larger mechanical stress
Slight crack is generated in inside or air gap causes shelf depreciation, to greatly accelerate the aging of insulator.
The main component of high-tension switch gear disc insulator is what epoxy resin, curing agent and alumina packing formed
Composite material, curing degree are defined as the degree that resin in composite material is cured cross-linking reaction, i.e., have occurred in resin matrix
Functional group's number of cross-linking reaction accounts for the percentage of curable functional group's sum.Curing degree is by insulating part modes of emplacement, heating
The influence of the factors such as equipment performance, cure stage and curing time, in actual production technical process control it is improper be easy to appear it is solid
Change non-uniform phenomenon, wherein curing degree lower position is often the weak link of entire insulating part electric property and mechanical performance.
Differential scanning calorimetry is curing degree measurement method more commonly used at present, and the principle of this method is: curing reaction
Belong to exothermic reaction, thermal discharge number with the type of resin functionality, participate in quantity, the type of curing agent of reactive functionality
And its usage amount etc. is related.The resin system determining for formula, curing reaction heat be it is certain, therefore, curing degree α can be used
Following formula calculates:
Wherein, Δ H0It is the total amount of heat released when resin system is fully cured, unit J/g, Δ HRIt is to be remained after solidifying
Remaining reaction heat, unit J/g.The shortcomings that differential scanning calorimetry is that this method belongs to destructive detection means, is needed in measured piece
Detection zone in carry out destructive sampling, the performance test before not being suitable for the factory of high-volume finished parts.Simultaneously by sampling number
The limitation of amount is difficult sufficiently to reflect the curing degree situation of large-scale disc insulator entirety.
Summary of the invention
The object of the present invention is to provide a kind of high-tension switch gear disc insulator curing degree lossless detection methods and dress
It sets, for solving the technical issues of large-scale disc insulator integrally curing degree lacks available nondestructiving detecting means.
In order to solve the above technical problems, that the present invention provides a kind of high-tension switch gears is lossless with disc insulator curing degree
Detection method, including following scheme:
Method scheme one: including
Step 1, ultrasonic pulse is emitted to insulator to be measured；
Step 2, insulator bottom surface ultrasonic reflections signal to be measured is obtained；
Step 3, Fast Fourier Transform (FFT) is carried out to the ultrasonic reflections signal, calculates the ultrasonic reflections signal
Power spectrum；
Step 4, the peak value of the power spectrum is compared with relationship library, and then obtains the solidification of the insulator to be measured
Degree；The relationship library is solidified by carrying out the insulator that ultrasonic test obtains to the different insulator test product of various curing degrees
The corresponding relationship of degree and insulator bottom surface ultrasonic reflections power spectrum signal.
Method scheme two: it is to be measured to obtain on the basis of method scheme one, in step 2 by repeated detection to average method
Insulator bottom surface ultrasonic reflections signal.
Method scheme three: on the basis of method scheme one or method scheme two, the step in the relationship library is obtained in step 4
Suddenly include:
(1) the non-uniform disc insulator test sample of curing degree is obtained；
(2) ultrasonic pulse is emitted to the disc insulator test sample, obtains disc insulator test sample bottom
Face ultrasonic reflections signal；
(3) Fast Fourier Transform (FFT) is carried out to the ultrasonic reflections signal, calculates the ultrasonic reflections signal
Power spectrum；
(4) curing degree of the disc insulator test sample is measured using differential scanning calorimeter；
(5) it according to the power spectrum of the curing degree of the disc insulator test sample and ultrasonic reflections signal, establishes exhausted
The relationship library of edge curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
The present invention also provides a kind of high-tension switch gear disc insulator curing degree non-destructive testing device, including it is following
Scheme:
Device scheme one: including
For the unit to insulator to be measured transmitting ultrasonic pulse；
For obtaining the unit of insulator bottom surface ultrasonic reflections signal to be measured；
For carrying out Fast Fourier Transform (FFT) to the ultrasonic reflections signal, the ultrasonic reflections signal is calculated
The unit of power spectrum；
For the peak value of the power spectrum to be compared with relationship library, and then obtain the curing degree of the insulator to be measured
Unit；The relationship library is by carrying out the insulator that ultrasonic test obtains to the different insulator test product of various curing degrees
The corresponding relationship of curing degree and insulator bottom surface ultrasonic reflections power spectrum signal.
Device scheme two: on the basis of device scheme one, for obtaining insulator bottom surface ultrasonic reflections letter to be measured
Number unit method is averaged to obtain insulator bottom surface ultrasonic reflections signal to be measured by repeated detection.
Device scheme three: on the basis of device scheme one or device scheme two, for obtaining the device in the relationship library
Include:
For obtaining the unit of the non-uniform disc insulator test sample of curing degree；
For emitting ultrasonic pulse to the disc insulator test sample, disc insulator test sample bottom is obtained
The unit of face ultrasonic reflections signal；
For carrying out Fast Fourier Transform (FFT) to the ultrasonic reflections signal, the ultrasonic reflections signal is calculated
The unit of power spectrum；
For measuring the unit of the curing degree of the disc insulator test sample using differential scanning calorimeter；
For establishing exhausted according to the curing degree of the disc insulator test sample and the power spectrum of ultrasonic reflections signal
The unit in the relationship library of edge curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
The beneficial effects of the present invention are: by obtaining insulator bottom surface ultrasonic reflections signal to be measured, and to the reflection
Signal carries out Fast Fourier Transform (FFT), and then calculates the power spectrum of ultrasonic reflections signal, compares insulator curing degree and absolutely
The relationship library of edge bottom surface ultrasonic reflections power spectrum signal corresponding relationship, finally obtains the curing degree of insulator to be measured, real
The non-destructive testing of existing disc insulator integrally curing degree, further improves the outgoing of large-scale disc insulator.
Detailed description of the invention
Fig. 1 is disc insulator detection position；
Fig. 2 is the structure chart of portable supersonic detection system；
Fig. 3 is disc insulator test sample upper surface and bottom surface back wave；
Fig. 4 is the FFT transform result of bottom surface back wave at 4 different locations of disc insulator test sample；
Fig. 5 is the spectrum peak of ultrasonic reflections wave at 4 different locations of disc insulator test sample；
Fig. 6 is the curing degree measurement result at 4 different locations of disc insulator test specimen；
Fig. 7 is that the curing degree at 4 different locations of disc insulator test sample is corresponding with spectrum peak average value
Relationship.
Specific embodiment
The present invention will be further described in detail with reference to the accompanying drawing.
The embodiment of high-tension switch gear disc insulator curing degree lossless detection method:
Firstly, obtaining the relationship of insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship
Library mainly comprises the steps that
(1) the non-uniform disc insulator test sample of curing degree is obtained.
In order to obtain different curing degree distributions in same disc insulator test sample, by the way of being disposed vertically
The casting of 1100kV disc insulator is carried out, the main view of the disc insulator test sample of acquisition is as shown in Figure 1.The basin in Fig. 1
In the position 1-4 of formula isolator detecting sample, position 1 is consolidation zone first, and subsequent consolidation zone is position 2 and position 3,
Position 4 is final curing region.Curing time length is an important factor for influencing curing degree, not change the item of other influences factor
Under part, curing time is longer, and the curing degree for obtaining sample is higher.Therefore, the curing degree highest of position 1, the curing degree of position 4 is most
It is low.
(2) ultrasonic pulse is emitted to the disc insulator test sample, obtains disc insulator test sample bottom
Face ultrasonic reflections signal.
Corresponding ultrasonic measurement is carried out using the portable supersonic detection system of building in the present embodiment, wherein this is just
The structure chart for taking formula ultrasonic wave detecting system is as shown in Figure 2.The set detection system by Portable ultrasonic flaw detector, data line,
Three-way connector, ultrasonic probe, couplant, digital oscilloscope, USB flash drive and computer composition.In the present embodiment just
Take the selection of formula supersonic detector 1 is the USM Go supersonic detector of GE company, U.S. production, the model of ultrasonic probe
The TDS2012C digital oscilloscope produced for 2.5Z10N, digital oscilloscope using Imtech, the U.S..A whole set of detection device at
This Payment control is within 50,000 yuan.It will be realized between Portable ultrasonic flaw detector and three-way connector using data line electrical
Connection, one end of three-way connector, which passes through, realizes electrical connection between data line and ultrasonic probe, three-way connector it is another
Couplant is applied to the to be detected of disc insulator test block by realizing electrical connection between data line and digital oscilloscope by end
Position is detected using position of the ultrasonic probe to daubing coupling agent in disc insulator test block.Using pulse reflection
Detection mode carries out cure degree measurement, and the transmitting signal and reception signal of ultrasonic probe are transmitted to number by three-way connector
Oscillograph carries out waveform recording.Using the waveform signal that digital oscilloscope is recorded USB flash drive be transmitted in computer into
The analysis of row signal.
Certainly, in the case where the ultrasonic measurement to quenching nozzle sample can be achieved, existing other can also be used and surpass
Acoustic wave sensing system.
Ultrasonic wave arteries and veins is emitted to non-uniform disc insulator test sample using above-mentioned portable supersonic detection system
Punching, test sample upper surface and bottom surface back wave are as shown in Figure 3.
(3) Fast Fourier Transform (FFT) is carried out to ultrasonic reflections signal obtained, calculates ultrasonic reflections signal
Power spectrum.
Since the signal of any shape may be expressed as the superposition of unlimited different frequency sinusoidal signal, mathematically use
Fourier sequence indicates.The periodic signal f (t) for being T for the period, Fourier sequence are
Wherein, a0、anAnd b0It is Fourier coefficient, fnFor the frequency of each harmonic.
For conventional ultrasonic signal, it is generally regarded as the transient signal of finite time, cycle T is intended to infinite
Greatly, i.e.,
The then Fourier transformation of f (t) is defined as:
Wherein, F (w) is complex function, and power spectrum is
Wherein, Re [F (w)] indicates that the real part of F (w), Im [F (w)] indicate the imaginary part of F (w).
The power spectrum of ultrasonic reflections signal can be calculated according to formula (1)~(4), Fig. 4, which gives, insulate to benzvalene form
When carrying out 5 measurements respectively at 4 different locations of sub- test sample, the fast Fourier of test sample bottom surface reflection wave signal
Convert the result of (FFT).
Each reflection signal power spectrum peak in Fig. 4 is counted, and finds out the average value of each peak value.Fig. 5 gives
The spectrum peak for sampling resulting ultrasonic reflections signal at 4 different locations of disc insulator test sample for 5 times, gives simultaneously
The average value of the ultrasonic reflections signal power spectrum peak at each position is gone out.
(4) using the curing degree of differential scanning calorimeter measurement disc insulator test sample.
The disc insulator test sample in Fig. 1 is destroyed using the method that hydraulic pressure destroys, the position 1- in Fig. 1
It is sampled respectively at 4, carries out curing degree measurement using differential scanning calorimeter (DSC), the curing degree at the 1-4 of position measures knot
Fruit is as shown in Figure 6.
(5) according to the power of the curing degree of disc insulator test sample and insulator bottom surface ultrasonic reflections signal
Spectrum establishes the relationship library of the corresponding relationship of insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal.
Disc insulator obtained is measured according to curing degree is carried out using differential scanning calorimeter (DSC) in step (4)
Ultrasonic reflections signal power obtained in curing degree measurement result and step (3) at 4 different locations of test sample
The mean value of spectrum peak obtains the curing degree and spectrum peak average value at 4 different locations of disc insulator test sample
Corresponding relationship, as shown in Figure 7.By two lines in Fig. 7 it is found that the curing degree of disc insulator test sample position with
The variation tendency of spectrum peak is very approximate, therefore can be by establishing insulator curing degree and insulator bottom surface ultrasonic wave
Reflection signal power composes the relationship library of corresponding relationship, when needing to measure the curing degree of disc insulator, it is only necessary to by ultrasonic wave
Reflection signal power spectrum peak is compared with relationship library, and the nondestructive measurement of disc insulator curing degree can be realized.
In the present embodiment, 5 sampled values are only gived at 4 different locations of disc insulator test sample respectively, but
When actually establishing relationship library of the disc insulator curing degree with insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship,
It needs to carry out multiple repairing weld to the disc insulator test sample of multiple and different curing degrees, and the curing degree type selected is more,
The sampling number of every kind of curing degree is more, the insulator curing degree established and insulator bottom surface ultrasonic reflections signal power
Information in the relationship library of the corresponding relationship of spectrum is more complete and accurate.
Certainly, the corresponding relationship of above-mentioned insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal can also
By tabling look-up, either existing calculation formula is obtained in the prior art.
In addition, above-mentioned acquisition insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship
Method is first to carry out ultrasound examination to the same disc insulator test sample, then carry out differential scanning calorimeter (DSC) and break
Bad property curing degree measurement.It, can also be to therein for being regarded as multiple disc insulator test samples of identical curing degree
A part of sample carries out ultrasound examination, carries out differential scanning calorimeter (DSC) destructive curing degree to another part sample
Measurement, and then establish the relationship library of insulator curing degree Yu insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
Insulator curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship based on above-mentioned acquisition
Relationship library, high-tension switch gear disc insulator curing degree uniformity lossless detection method specifically includes the following steps:
Step 1, ultrasonic pulse is emitted to insulator to be measured；
Step 2, insulator bottom surface ultrasonic reflections signal to be measured is obtained；
Step 3, Fast Fourier Transform (FFT) is carried out to ultrasonic reflections signal, calculates the power of ultrasonic reflections signal
Spectrum；
Step 4, the peak value of power spectrum is compared with relationship library, and then obtains the curing degree of insulator to be measured；Wherein
Relationship library be insulator curing degree Yu insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
It is different to obtain insulator to be measured that method averaged by repeated detection in order to improve the accuracy of measurement, in step 2
The ultrasonic reflections signal of lower surface at position.
The embodiment of high-tension switch gear disc insulator curing degree non-destructive testing device: including
For the unit to insulator to be measured transmitting ultrasonic pulse；
For obtaining the unit of insulator bottom surface ultrasonic reflections signal to be measured；
For carrying out Fast Fourier Transform (FFT) to the ultrasonic reflections signal, the ultrasonic reflections signal is calculated
The unit of power spectrum；
For the peak value of the power spectrum to be compared with relationship library, and then obtain the curing degree of the insulator to be measured
Unit；The relationship library is by carrying out the insulator that ultrasonic test obtains to the different insulator test product of various curing degrees
The corresponding relationship of curing degree and insulator bottom surface ultrasonic reflections power spectrum signal.
High-tension switch gear disc insulator curing degree non-destructive testing device in the present invention, is actually based on above-mentioned
A kind of computer solution of high-tension switch gear disc insulator curing degree lossless detection method, i.e., a kind of software structure
Frame, the software can be run in insulator cure degree measurement equipment.Since sufficiently clear is complete for the introduction to the above method
It is whole, therefore be no longer described in detail.
Claims (6)
1. a kind of high-tension switch gear disc insulator curing degree lossless detection method, which comprises the following steps:
Step 1, ultrasonic pulse is emitted to insulator to be measured；
Step 2, insulator bottom surface ultrasonic reflections signal to be measured is obtained；
Step 3, Fast Fourier Transform (FFT) is carried out to the ultrasonic reflections signal, calculates the function of the ultrasonic reflections signal
Rate spectrum；
Step 4, the peak value of the power spectrum is compared with relationship library, and then obtains the curing degree of the insulator to be measured；
The relationship library is by carrying out the insulator curing degree that ultrasonic test obtains to the different insulator test product of various curing degrees
With the corresponding relationship of insulator bottom surface ultrasonic reflections power spectrum signal.
2. high-tension switch gear according to claim 1 disc insulator curing degree lossless detection method, feature exist
In averaging method by repeated detection in step 2 to obtain insulator bottom surface ultrasonic reflections signal to be measured.
3. high-tension switch gear according to claim 1 or 2 disc insulator curing degree lossless detection method, feature
The step of being, the relationship library is obtained in step 4 include:
(1) the non-uniform disc insulator test sample of curing degree is obtained；
(2) ultrasonic pulse is emitted to the disc insulator test sample, it is super obtains disc insulator test sample bottom surface
Sound wave reflects signal；
(3) Fast Fourier Transform (FFT) is carried out to the ultrasonic reflections signal, calculates the power of the ultrasonic reflections signal
Spectrum；
(4) curing degree of the disc insulator test sample is measured using differential scanning calorimeter；
(5) according to the power spectrum of the curing degree of the disc insulator test sample and ultrasonic reflections signal, insulator is established
The relationship library of curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
4. a kind of high-tension switch gear disc insulator curing degree non-destructive testing device, which is characterized in that including
For the unit to insulator to be measured transmitting ultrasonic pulse；
For obtaining the unit of insulator bottom surface ultrasonic reflections signal to be measured；
For carrying out Fast Fourier Transform (FFT) to the ultrasonic reflections signal, the power of the ultrasonic reflections signal is calculated
The unit of spectrum；
For the peak value of the power spectrum to be compared with relationship library, and then obtain the list of the curing degree of the insulator to be measured
Member；The relationship library is solidified by carrying out the insulator that ultrasonic test obtains to the different insulator test product of various curing degrees
The corresponding relationship of degree and insulator bottom surface ultrasonic reflections power spectrum signal.
5. high-tension switch gear according to claim 4 disc insulator curing degree non-destructive testing device, feature exist
In it is to be measured to obtain to average method for obtaining the unit of insulator bottom surface ultrasonic reflections signal to be measured by repeated detection
Insulator bottom surface ultrasonic reflections signal.
6. high-tension switch gear according to claim 4 or 5 disc insulator curing degree non-destructive testing device, feature
It is, the device for obtaining the relationship library includes:
For obtaining the unit of the non-uniform disc insulator test sample of curing degree；
For emitting ultrasonic pulse to the disc insulator test sample, it is super to obtain disc insulator test sample bottom surface
The unit of sound wave reflection signal；
For carrying out Fast Fourier Transform (FFT) to the ultrasonic reflections signal, the power of the ultrasonic reflections signal is calculated
The unit of spectrum；
For measuring the unit of the curing degree of the disc insulator test sample using differential scanning calorimeter；
For establishing insulator according to the curing degree of the disc insulator test sample and the power spectrum of ultrasonic reflections signal
The unit in the relationship library of curing degree and insulator bottom surface ultrasonic reflections power spectrum signal corresponding relationship.
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| CN111122699B (en) * | 2019-11-22 | 2022-04-05 | 国家电网有限公司 | Ultrasonic flaw detection device for basin-type insulator of penetration type combined electrical apparatus |
| CN111060605A (en) * | 2019-11-22 | 2020-04-24 | 国家电网有限公司 | High-power ultrasonic detection device for basin-type insulator of transformer substation combined electrical apparatus |
| CN111007340A (en) * | 2019-12-16 | 2020-04-14 | 广东电网有限责任公司 | Method, system and equipment for diagnosing aging of silicone rubber of cable accessory |
| CN111812461A (en) * | 2020-06-08 | 2020-10-23 | 天津大学 | Three-post insulator latent defect detection method based on ultrasonic propagation characteristics |
| CN112630611B (en) * | 2020-12-14 | 2022-04-22 | 华南理工大学 | Test method for detecting uniformity of basin-type insulator by ultrasonic longitudinal wave reflection method |
| CN114509110B (en) * | 2022-01-11 | 2023-10-10 | 西安理工大学 | Basin-type insulator stress monitoring system based on digital twin technology |
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| CN1148170A (en) * | 1995-12-25 | 1997-04-23 | 南京航空航天大学 | Optical fiber real-time monitoring method and system for the curing course of resin based compounded material |
| US20050107703A1 (en) * | 2003-09-22 | 2005-05-19 | Bullis James K. | Ultrasonic imaging with spot focused waves |
| CN101206194A (en) * | 2007-11-14 | 2008-06-25 | 天津工业大学 | On-line monitoring method and monitoring device for resin solidify reaction process |
| EP2266111A1 (en) * | 2008-03-03 | 2010-12-29 | 3M Innovative Properties Company | Process for audible acoustic frequency management in gas flow systems |
| ES2736276T3 (en) * | 2008-07-14 | 2019-12-27 | Arizona Board Of Regents For And On Behalf Of Arizona State Univ | Cellular activity modulation devices using ultrasound |
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| CN105372333A (en) * | 2015-11-09 | 2016-03-02 | 中核(天津)科技发展有限公司 | High-molecular material curing degree nondestructive test method |
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