CN106053603A - Ultrasonic time-domain detection method for pore defect of epoxy casting insulation part - Google Patents
Ultrasonic time-domain detection method for pore defect of epoxy casting insulation part Download PDFInfo
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- CN106053603A CN106053603A CN201610395454.2A CN201610395454A CN106053603A CN 106053603 A CN106053603 A CN 106053603A CN 201610395454 A CN201610395454 A CN 201610395454A CN 106053603 A CN106053603 A CN 106053603A
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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
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention relates to an ultrasonic time-domain detection method for a pore defect of an epoxy casting insulation part. The method comprises steps as follows: firstly, an ultrasonic velocity in a to-be-detected insulation material is detected; ultrasonic pulse is emitted to a to-be-detected insulation part, a reflected wave is detected and converted into a time-voltage signal, an abrupt change point of a waveform is found, time corresponding to the abrupt change point is recorded, the abrupt change point of the waveform corresponds to the pore defect in the insulation material, and the position and the dimension of the pore defect are calculated according to the time corresponding to the abrupt change point and the ultrasonic velocity obtained in the former step. With the adoption of the method for detection, the application of ultrasonic detection in a material such as the epoxy insulation part with large ultrasonic attenuation coefficient becomes possible. Besides, according to establishment of a detection system for implementing the method, the required device cost is lower, and radiation hazard caused by a radiographic detection method is avoided.
Description
Technical field
The present invention relates to the ultrasonic detection method of high-tension switch gear epoxy casting insulating part gas hole defect.
Background technology
Epoxy casting insulating part is one of key components and parts of high-tension switch gear, plays insulation, supports, splits air chamber etc.
Important function, its performance will directly determine insulating properties and the operational reliability of high-tension switch gear.Epoxy casting is insulated
Part quality testing, the most conventional means are X-ray Real-time Imaging technology.Although the method has, efficiency is high, speed is fast,
Life-time service low cost, be easy to image procossing and the advantage of easily storage, but ray has radiation hazradial bundle to human body, and needs are special
Protection room in detect, be unfavorable for scene, online under the conditions of carry out.Meanwhile, the disposable throwing of X-ray realtime imaging equipment
Enter relatively big, for specific part such as metal insert and the gas hole defect of casting resin interface of insulating part, due to transillumination direction
Restriction there is check frequency.Therefore, find a kind of harmless, flexible operation, Non-Destructive Testing side that detection sensitivity is high
Method is significant for the quality promoting the casting insulated part of epoxy further.
For the quality testing of insulating products, the most relatively common means are X-ray Testing Technologies.From 60 years last century
In generation, starts, and ultrasound detection is as a kind of mode of Dynamic Non-Destruction Measurement, it is thus achieved that fast-developing.But, this detection technique
Application focuses primarily upon metal and concrete material, because both materials have good acoustic propagation characteristic.With common metal
Material is compared, and the ultrasonic attenuation coefficient of epoxy casting insulating part is relatively big, causes the biggest difficulty to the extraction of flaw indication.
Summary of the invention
It is an object of the invention to provide the ultrasound wave inspection of a kind of high-tension switch gear epoxy casting insulating part gas hole defect
Survey method, to substitute X-ray detection, thus, the problem such as operation inconvenient big to harm of avoiding that X-ray detect.
For achieving the above object, the solution of the present invention includes:
The ultrasound wave Time-Domain Detection Method of epoxy casting insulating part gas hole defect, step is as follows:
First, detection ultrasonic velocity in insulant to be measured；
Then, then insulating part to be measured is being launched ultrasonic pulse, and detecting echo, when by reflected wave conversion being
M-voltage signal, finds the catastrophe point of waveform, and the time that catastrophe point is corresponding, and waveform catastrophe point i.e. correspond to gas hole defect,
The ultrasonic velocity that the time corresponding according to catastrophe point and previous step obtain calculates the positions and dimensions of gas hole defect.
Insulating part surface to be measured is scanned, for there being the position of a gas hole defect, first sudden change of its waveform
Point i.e. represents gas hole defect upper surface, and second catastrophe point represents gas hole defect lower surface, determines pore by first time
The upper surface location of defect, determines the lower surface position of gas hole defect by second time, determines that pore lacks by time difference
Fall into size.
When detecting the ultrasonic velocity in insulant to be measured, the insulating part of material identical with insulating part to be measured is selected to enter
Row detection, or select the zero defect position of insulating part to be measured to detect.
For being generally used for the ultrasound detection of metal and concrete material, ultrasonic wave attenuation coefficient is mainly relied on to examine
Surveying, the present invention is applied to the defects detection of epoxy casting insulating part.Ultrasonic attenuation system due to epoxy casting insulant
Number is big, it is impossible to directly application is generally used for the ultrasonic detection method of metal and concrete material, and therefore the present invention proposes one
Kind of ultrasound wave Time-Domain Detection Method, first detection ultrasound wave spread speed in insulating part medium to be measured, then to be measured absolutely
Edge part emission pulse ultrasonic, and detect echo, it is the signal of telecommunication by reflected wave conversion, finds the catastrophe point of waveform, record
The corresponding time i.e. can detect that gas hole defect；Such as, first catastrophe point i.e. represents the upper surface of gas hole defect, dashes forward for second
The lower surface of variable-point representation gas hole defect, the time of record catastrophe point, calculates gas hole defect in conjunction with ultrasonic propagation velocity
Positions and dimensions.
The method using the present invention detects so that in the material that epoxy insulator this ultrasonic attenuation system is the biggest
Application ultrasound detection is possibly realized.And, build a detecting system implementing the method, the device cost of needs is relatively low, also
There is no the radiation hazradial bundle of ray detection method.
Experiment shows, a kind of based on ultrasound wave time-domain waveform analysis the epoxy casting insulating part pore damage of the present invention is fixed
Position, quantitative measurement techniques, can be carried out for buried depth diameter pore damage from 5.0mm to 2.0mm in the range of 30mm
Location, detection by quantitative accurately, for buried depth diameter pore damage from 5.0mm to 4.0mm in the range of 30mm-60mm
Can position accurately, detection by quantitative.
Accompanying drawing explanation
Fig. 1 is a kind of detecting system of the present invention；
Fig. 2 is the another kind of detecting system of the present invention；
Fig. 3 is overhaul flow chart；
Fig. 4 is ultrasonic velocity Cleaning Principle figure；
Fig. 5 is 30mm degree of depth 5.0mm diameter gas hole defect testing result；
Fig. 6 is 30mm degree of depth 2.0mm diameter gas hole defect upper and lower surface reflected signal test result；
Fig. 7 is 60mm degree of depth 5.0mm diameter gas hole defect testing result；
Fig. 8 is 60mm degree of depth 4.0mm diameter gas hole defect upper and lower surface reflected signal test result.
Detailed description of the invention
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Be illustrated in figure 1 a kind of embodiment of ultrasonic wave detecting system, including ultrasonic transmitter, ultrasonic receiver,
Probe, oscillograph and background computer.Ultrasonic transmitter sends ultrasound wave by probe to insulating part to be measured, ultrasound wave receives
Device receives echo, and when being converted to by oscillograph, m-voltage waveform, is analyzed by background computer and calculates.Probe
And scribble couplant between insulating part to be measured.
Such as the another kind of embodiment that Fig. 2 is ultrasonic wave detecting system, including ultrasonic reflectoscope, joint, probe, oscillograph
And background computer.Ultrasonic reflectoscope passes through wire jointing, and joint connects probe, and joint is also connected with oscillograph simultaneously,
Oscillograph connects background computer.Scribbling couplant between probe and insulating part to be measured, probe is i.e. launched ultrasound wave and is also received instead
Ejected wave.The ultrasonic reflectoscope bought on market is used, it is achieved more convenient between this mode, the most portable.It addition, also
Can transfer to be analyzed on background computer by oscillographic data by storage devices such as USB flash disks.
It should be noted that both the above ultrasonic wave detecting system is prior art, it is used for metal in prior art
The detecting system of flaw detection is identical.It is to say, the detecting system of the present invention can also use in prior art for metal
The detecting system of other forms of flaw detection.
Below the detection method of the present invention is specifically described.
The feature of the detection method of the present invention, is mainly independent of ultrasonic attenuation, is suitable for epoxy insulation material.
Concrete, the ultrasound wave Time-Domain Detection Method of epoxy casting insulating part gas hole defect, step is as follows:
First, detection ultrasonic velocity in insulant to be measured.Material identical with insulating part to be measured can be selected
Insulating part detects, it is also possible to select the zero defect position of insulating part to be measured to detect, to obtain at insulant to be measured
In ultrasonic velocity.
Then, then insulating part to be measured is being sent pulse ultrasonic wave, and detecting echo, when by reflected wave conversion being
M-voltage signal, finds the catastrophe point of waveform, and the time that catastrophe point is corresponding, and waveform catastrophe point i.e. correspond to gas hole defect,
The ultrasonic velocity that the time corresponding according to catastrophe point and previous step obtain calculates the positions and dimensions of gas hole defect.
The catastrophe point of so-called waveform, the point that i.e. voltage is undergone mutation, waveform catastrophe point i.e. correspond to pore position.To be measured
Insulating part surface is scanned, and for there being the position of a gas hole defect, first catastrophe point of its waveform i.e. represents that pore lacks
Falling into upper surface, second catastrophe point represents gas hole defect lower surface, is determined the upper surface position of gas hole defect by first time
Put, determined the lower surface position of gas hole defect by second time, determine gas hole defect upper and lower surface spacing by time difference
From, i.e. the size of gas hole defect.
In order to verify the method for the present invention, the present invention has built detecting system, and detecting system is by portable ultraphonic
Wave inspection instrument, data connecting line, three-way connector, ultrasound probe, couplant, epoxy casting insulating part test block, numeral oscillography
Device, USB flash drive, computer form.In this patent, that Portable ultrasonic flaw detector is selected is the USM of GE company of U.S. production
Go ultrasonic reflectoscope, the model of ultrasound probe is 2.5Z10N, and epoxy casting insulating part test block is self-control mark Han gas hole defect
Quasi-test block.The height of first and second grades of steps is respectively 30mm and 60mm, and the upper surface at step is cast with diameter respectively
6 pores of 5.0mm, 4.0mm, 3.0mm, 2.0mm, 1.0mm, 0.5mm, the degree of depth of pore respectively with respective equal diameters.Number
Word oscillograph is the TDS2012C digital oscilloscope that Imtech of the U.S. produces.Data connecting line is utilized to be visited by portable supersonic
Hindering and realize electrical connection between instrument and three-way connector 3, data connecting line and ultrasound probe are passed through in one end of three-way connector
Between realize electrical connection, the other end of three-way connector is by realizing between data connecting line and digital oscilloscope electrically connecting
Connect, couplant is applied to the position to be detected of epoxy casting insulating part test block, utilize ultrasound probe that epoxy casting is insulated
In part test block, the position of daubing coupling agent carries out pore damage check.Pulse reflection detection mode is used to carry out gas hole defect inspection
Surveying, the transmitting signal of ultrasound probe and reception signal are sent to digital oscilloscope by three-way connector and carry out waveform recording.
The waveshape signal utilizing USB flash drive to be recorded by digital oscilloscope is sent in computer carry out signal analysis.
First carry out epoxy casting insulating part ultrasonic velocity measure: utilize USM Go ultrasonic reflectoscope high voltage,
Ultrasound probe is encouraged by high-energy mode of excitation.30mm thickness pore-free defective bit in epoxy casting insulating part test block
Put place, record initial spike and test block bottom surface ultrasonic reflections signal respectively with digital oscilloscope, through USB flash drive by ripple
Graphic data is transferred on computer be analyzed, and result is as shown in Figure 4.Afterwards, measure in the diagram under initial spike and test block
Time interval between the ultrasonic reflections signal of bottom surface is 19.36us, and calculating the velocity of sound within insulating part accordingly is (30 × 2
× 10-3) m/ (19.36 × 10-6) s=3099m/s.
Then gas hole defect location, detection by quantitative are carried out: to different in epoxy casting insulating part test block buried depth, differences
The gas hole defect of diameter detects.Utilize the high voltage of USM Go ultrasonic reflectoscope, high-energy mode of excitation to ultrasound wave
Probe encourages.Couplant is applied to the position to be detected of epoxy casting insulating part test block 6.Utilize ultrasound probe at ring
30mm thickness and the 60mm thickness different-diameter gas hole defect position of oxygen casting insulated part test block carry out scanning, with numeral oscillography
Device is recorded initial spike, gas hole defect upper surface ultrasonic reflections signal (first catastrophe point) and gas hole defect respectively and is gone to the bottom
Face ultrasonic reflections signal (second catastrophe point), is transferred on computer be analyzed by Wave data through USB flash drive.Point
Do not measure the time interval between gas hole defect upper surface and bottom surface ultrasonic reflections signal and initial spike, water at epoxy
In the case of the internal velocity of sound of note insulating part is calculated by previous step, gas hole defect upper surface can be calculated and go to the bottom
The appearance position in face.The appearance position of gas hole defect upper surface is the buried depth of gas hole defect, the appearance position of bottom surface
Occur that the difference of position is the diameter dimension of gas hole defect with upper surface.
Fig. 5 show 30mm depth 5.0mm diameter gas hole defect testing result, 5.0mm diameter pore upper surface and under
Time interval between surface echo and initial spike is respectively 16.16us and 19.36us, calculates gas hole defect upper surface
Correspondence position is (16.16 × 10-6S × 3099m/s)/2=25.04mm, gas hole defect lower surface correspondence position be (19.36 ×
10-6S × 3099m/s)/2=30mm, calculating pore size accordingly is 4.96mm.Gas hole defect position error is 0.16%, gas
Hole defect dimensional measurement error is 0.8%.
Fig. 6 show the amplification display knot of 30mm depth 2.0mm diameter gas hole defect upper and lower surface echo
Really, wherein the time interval between upper and lower surface echo and initial spike is respectively 18.09us and 19.32us, meter
Calculating gas hole defect upper surface correspondence position is (18.09 × 10-6S × 3099m/s)/2=28.03mm, gas hole defect lower surface
Correspondence position is (19.32 × 10-6S × 3099m/s)/2=29.94mm, calculating pore size accordingly is 1.91mm.Pore lacks
Sunken position error is 0.11%, and gas hole defect dimensional measurement error is 4.5%.
Fig. 7 show 60mm depth 5.0mm diameter gas hole defect testing result, 5.0mm diameter pore upper surface and under
Time interval between surface echo and initial spike is respectively 35.60us and 38.92us, calculates gas hole defect upper surface
Correspondence position is (35.60 × 10-6S × 3099m/s)/2=55.16mm, gas hole defect lower surface correspondence position be (38.92 ×
10-6S × 3099m/s)/2=60.31mm, calculating pore size accordingly is 5.15mm.Gas hole defect position error is
0.29%, gas hole defect dimensional measurement error is 3.0%.
Fig. 8 show the amplification display knot of 60mm depth 4.0mm diameter gas hole defect upper and lower surface echo
Really, wherein the time interval between upper and lower surface echo and initial spike is respectively 35.84us and 38.60us, meter
Calculating gas hole defect upper surface correspondence position is (35.84 × 10-6S × 3099m/s)/2=55.53mm, gas hole defect lower surface
Correspondence position is (38.60 × 10-6S × 3099m/s)/2=59.81mm, calculating pore size accordingly is 4.28mm.Pore lacks
Sunken position error is 0.84%, and gas hole defect dimensional measurement error is 7.0%.
In sum, use the detection method that is given of this patent can to buried depth in the range of 30mm diameter from
The gas hole defect of 5.0mm to 2.0mm and buried depth be diameter gas hole defect from 5.0mm to 4.0mm in the range of 30mm-60mm
Can position accurately, detection by quantitative.The position error of gas hole defect is less than 1%, and dimensional measurement error is less than
7.0%.
It is presented above the detailed description of the invention that the present invention relates to, but the present invention is not limited to described embodiment.
Under the thinking that the present invention provides, use the mode being readily apparent that to those skilled in the art to the skill in above-described embodiment
Art means carry out converting, replace, revise, and the effect played is essentially identical with the relevant art means in the present invention, realize
Goal of the invention the most essentially identical, so formed technical scheme above-described embodiment is finely adjusted formation, this technology
Scheme still falls within protection scope of the present invention.
Claims (3)
1. the ultrasound wave Time-Domain Detection Method of epoxy casting insulating part gas hole defect, it is characterised in that step is as follows:
First, detection ultrasonic velocity in insulant to be measured；
Then, then insulating part to be measured is being launched ultrasonic pulse, and detecting echo, m-when by reflected wave conversion being
Voltage signal, finds the catastrophe point of waveform, and the time that catastrophe point is corresponding, and waveform catastrophe point i.e. correspond to inside insulant
Gas hole defect, the ultrasonic velocity that the time corresponding according to catastrophe point and previous step obtain calculate gas hole defect position and
Size.
The ultrasound wave Time-Domain Detection Method of epoxy casting insulating part gas hole defect the most according to claim 1, its feature exists
In, insulating part surface to be measured is scanned, for there being the position of a gas hole defect, first i.e. table of catastrophe point of its waveform
Show that gas hole defect upper surface, second catastrophe point represent gas hole defect lower surface, determine gas hole defect by first time
Upper surface location, is determined the lower surface position of gas hole defect, determines gas hole defect size by time difference by second time.
The ultrasound wave Time-Domain Detection Method of epoxy casting insulating part gas hole defect the most according to claim 1, its feature exists
In, when detecting the ultrasonic velocity in insulant to be measured, select the insulating part of material identical with insulating part to be measured to examine
Survey, or select the zero defect position of insulating part to be measured to detect.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110320272A (en) * | 2019-06-17 | 2019-10-11 | 华南理工大学 | A kind of detection method of three support insulators center conductor and epoxy part faying face |
| CN111257418A (en) * | 2020-02-03 | 2020-06-09 | 天津大学 | Internal defect detection device for extra-high voltage insulation pull rod |
| CN111257416A (en) * | 2020-02-03 | 2020-06-09 | 天津大学 | Method for detecting internal defects of extra-high voltage insulating pull rod |
| CN113916989A (en) * | 2021-09-24 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Method and system for detecting internal defects of high-performance epoxy insulating part of power system |
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|---|---|---|---|---|
| CN110320272A (en) * | 2019-06-17 | 2019-10-11 | 华南理工大学 | A kind of detection method of three support insulators center conductor and epoxy part faying face |
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| CN113916989A (en) * | 2021-09-24 | 2022-01-11 | 广东电网有限责任公司广州供电局 | Method and system for detecting internal defects of high-performance epoxy insulating part of power system |
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Application publication date: 20161026 |