CN105044208A - Ultrahigh voltage SF6 breaker shell ultrasonic detection device and detection method thereof - Google Patents
Ultrahigh voltage SF6 breaker shell ultrasonic detection device and detection method thereof Download PDFInfo
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- CN105044208A CN105044208A CN201510363304.9A CN201510363304A CN105044208A CN 105044208 A CN105044208 A CN 105044208A CN 201510363304 A CN201510363304 A CN 201510363304A CN 105044208 A CN105044208 A CN 105044208A
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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
- 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
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
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Abstract
The invention discloses an ultrahigh voltage SF6 breaker shell ultrasonic detection device and detection method thereof. Conventional ultrasonic detection of an SF6 breaker has many technical difficulties. The device comprises a crystal twin focusing transverse wave sensor and a special contrast test block for ultrasonic test, the crystal twin focusing transverse wave sensor comprises a shielding shell, and a left wedge block and a right wedge block are arranged in the shielding shell in parallel; the bottom surfaces of the left wedge block and the right wedge block are horizontal planes; the upper surfaces of the left wedge block and the right wedge block are slopes with transverse and forward dip angles, a left transmission piezoelectric crystal plate and a right transmission piezoelectric crystal plate are arranged on the slopes of the left wedge block and the right wedge block respectively. The limitation of the conventional ultrasonic detection of an ultrahigh voltage SF6 breaker shell is overcome, texture noise of austenite is obviously reduced, signal to noise ratio of a defect signal is improved, resolution of an ultrasonic detection system is improved and the ultrasonic detection problem of the ultrahigh voltage SF6 breaker shell is finally effectively solved.
Description
Technical field
The present invention relates to electric power complete equipment field of non destructive testing, specifically a kind of extra-high voltage SF
6shell of circuit breaker butt-weld supersonic detection device and detection method thereof.
Background technology
In order to eliminate eddy-current heating, loss and the power that withstands shocks, extra-high voltage SF
6the 304 austenitic stainless steel welded case that isolating switch often adopts 8 ~ 16mm thick.For the isolating switch installed, because equipment is filled in inside, ray detection cannot be carried out.When using conventional Ultrasound detection technique, the thick tissue of austenitic stainless steel weld joint has strong attenuation to ultrasound wave, causes detection sensitivity to change greatly, cannot measure the size of defect; Thickly organize the superposition and shape transformation that also can cause strong scattered sound waves, defect location error is increased, so SF
6the conventional Ultrasound of isolating switch detects exists a lot of technical difficult point.
Summary of the invention
Technical matters to be solved by this invention is the defect overcoming the existence of above-mentioned conventional Ultrasound detection method, provides a kind of extra-high voltage SF
6shell of circuit breaker butt-weld supersonic detection device, it is at extra-high voltage SF
6shell of circuit breaker butt-weld both sides use focusing shear wave butt welded seam to carry out scanning, thus realize extra-high voltage SF
6shell of circuit breaker weld seam nondestructive evaluation.
For this reason, the technical solution used in the present invention is as follows: extra-high voltage SF
6shell of circuit breaker supersonic detection device, is characterized in that, comprises twin crystal and focuses on transverse wave sensor and the special reference block of Ultrasonic Detection,
Described twin crystal focuses on transverse wave sensor and comprises screening can, is provided with left voussoir and right voussoir in described screening can side by side; The bottom surface of left voussoir and right voussoir is surface level, and upper surface all has inclined-plane, and this inclined-plane has transverse direction and forward direction inclination angle, the inclined-plane of described left voussoir and right voussoir is arranged respectively left transmission piezoelectric wafer and rightly accepts piezoelectric chip;
Described left transmission piezoelectric wafer with right accept piezoelectric chip matching connection inductance after be connected transmitting probe and receiving transducer respectively again;
The special reference block of described Ultrasonic Detection comprises semicircle test block, the first reference block, the second reference block, the 3rd reference block, the 4th reference block, the 5th reference block, the 6th reference block and the 7th reference block, and described test block is made up of 304 austenitic stainless steels;
Described reference block comprises body, and the center of described body exists welded seam area, and the side in welded seam area and mother metal region or bottom surface have horizontal through hole, hyphen hole or wedge angle groove.
Make ultrasonic acoustic beam on workpiece, form the shear wave of specific refraction angle by inclined-plane of the present invention, and make ultrasonic sound beam focusing in the degree of depth (as 10mm) of regulation, thus realize SF
6the accurate location of isolating switch weld defect is with quantitative.
Further, be provided with sound insulating layer between described left voussoir and right voussoir, this sound insulating layer keeps apart two piezoelectric chips, launches acoustic beam and the mutual interference and the obstruction that reflect acoustic beam for overcoming; The inside filling sucting sound material of described left voussoir and right voussoir, acoustic absorbant is for absorbing clutter.
Further, the first described reference block, it arranges a horizontal through hole in the side, mother metal region apart from surperficial 3mm, and the diameter of this horizontal through hole is 2mm; Axis of a weld apart from surperficial 3mm also arranges a same horizontal through hole.
Further, the second described reference block, it arranges a horizontal through hole in the side, mother metal region apart from surperficial 8mm, and the diameter of this horizontal through hole is 2mm; Axis of a weld apart from surperficial 8mm also arranges a same horizontal through hole.
Further, the 3rd described reference block, it arranges a horizontal through hole in the side, mother metal region apart from surperficial 4mm, and the diameter of this horizontal through hole is 2mm; A same horizontal through hole is also set in the weld heat-affected zone side apart from surperficial 4mm.
Further, the 4th described reference block, it arranges a horizontal through hole in the side, mother metal region apart from surperficial 10mm, and the diameter of this horizontal through hole is 2mm; A same horizontal through hole is also set in the weld heat-affected zone side apart from surperficial 10mm.
Further, the 5th described reference block, its bottom surface, mother metal region arranges a wedge angle groove, this wedge angle flute length 2mm, high 2mm; The welded seam area bottom surface be positioned on axis of a weld also arranges a same wedge angle groove.
Further, the 6th described reference block, it arranges a hyphen hole in the side, mother metal region apart from surperficial 8mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 8mm also arranges a same hyphen hole.
Further, the 7th described reference block, it arranges a hyphen hole in the side, mother metal region apart from surperficial 4mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 4mm also arranges a same hyphen hole.
Each above-mentioned reference block all can be used for testing extra-high voltage SF
6the detectability of isolating switch supersonic detection device, the first to the four reference block may be used for the sensitivity adjustment before pick-up unit detection.
Extra-high voltage SF
6the basic functional principle of Shell of circuit breaker supersonic detection device is: ultrasound measuring instrument is connected with sensor special by connecting line, delay calibration is realized by semicircle test block, the horizontal through hole distance-amplitude curve of weld seam (i.e. DAC curve) is drawn, at extra-high voltage SF to the 4th test block by the first test block
6isolating switch butt-weld both sides use focusing shear wave butt welded seam to carry out scanning, thus realize extra-high voltage SF
6the nondestructive evaluation of Shell of circuit breaker weld seam.
Another object of the present invention is to provide above-mentioned extra-high voltage SF
6the detection method of Shell of circuit breaker supersonic detection device, its step is as follows: 1) supersonic detection device delay calibration, namely the delay between the moment utilizing the electronics trigger instants of the cambered surface correcting probe of semicircle test block and acoustic beam to enter measured workpiece, to draw the survey measurements of accurate sound path; 2) supersonic detection device angle calibration system, namely utilizes the hyphen hole of the 6th reference block to calibrate the incident angle of probe, to draw the survey measurements of the accurate degree of depth, surface distance; 3) the horizontal through hole distance-amplitude curve of weld seam is drawn, namely the horizontal through hole 30 × Ф 2 in the first reference block, the second reference block, the 3rd reference block and the 4th reference block weld seam is used, on ultrasound measuring instrument, drafting horizontal ordinate is distance, and ordinate is the curve of horizontal through hole reflection wave height; 4) signal to noise ratio (S/N ratio) of pick-up unit is tested; 5) resolving power of pick-up unit is tested; 6) extra-high voltage SF
6isolating switch butt-weld detects, and namely carries out zigzag scan Z in weld seam both sides, uses focusing shear wave butt welded seam quality to assess.
The detection method that the present invention adopts, can overcome SF
6the limitation that isolating switch conventional Ultrasound detects, improves the noise when resolving power detected, to realize SF
6the accurate location of isolating switch weld defect, quantitatively.
The beneficial effect that the present invention has is as follows: overcome extra-high voltage SF
6the limitation that Shell of circuit breaker conventional Ultrasound detects, can obviously reduce austenitic anatomical noise, improve the signal to noise ratio (S/N ratio) of flaw indication, improve the resolving power of ultrasonic testing system, the impact of heterogeneous interface interference wave can be avoided, eliminate glitch, finally efficiently solve extra-high voltage SF
6shell of circuit breaker ultrasound examination problem.
Accompanying drawing explanation
Fig. 1-2 is the structural representation (Fig. 2 is the vertical view of Fig. 1) of supersonic detection device semicircle of the present invention test block.
Fig. 3 is the structural representation of supersonic detection device first of the present invention reference block.
Fig. 4 is the structural representation of supersonic detection device second of the present invention reference block.
Fig. 5 is the structural representation of supersonic detection device of the present invention 3rd reference block.
Fig. 6 is the structural representation of supersonic detection device of the present invention 4th reference block.
Fig. 7 is the structural representation of supersonic detection device of the present invention 5th reference block.
Fig. 8 is the structural representation of supersonic detection device of the present invention 6th reference block.
Fig. 9 is the structural representation of supersonic detection device of the present invention 7th reference block.
Figure 10 is the structural representation that supersonic detection device twin crystal of the present invention focuses on transverse wave sensor.
Schematic diagram when Figure 11 is supersonic detection device of the present invention use.
Figure 12 is that the present invention carries out SF
6the block diagram that Shell of circuit breaker welding line ultrasonic detects.
Figure 13 is the signal to noise ratio (S/N ratio) oscillogram that conventional Ultrasound detection method obtains.
Figure 14 is the signal to noise ratio (S/N ratio) oscillogram that the present invention obtains.
Figure 15 is the resolving power oscillogram that conventional Ultrasound detection method obtains.
Figure 16 is the resolving power oscillogram that the present invention obtains.
Embodiment
Below by specification drawings and specific embodiments, the present invention is described in further detail, and following examples are descriptive is not determinate, can not limit protection scope of the present invention with this.
If Fig. 1 to Figure 10 is extra-high voltage SF
6isolating switch butt-weld supersonic detection device, it is by extra-high voltage SF
6the special reference block of isolating switch butt-weld and extra-high voltage SF
6isolating switch butt-weld twin crystal focuses on transverse wave sensor composition.
Extra-high voltage SF
6the special reference block of isolating switch butt-weld comprises semicircle test block, the first reference block, the second reference block, the 3rd reference block, the 4th reference block, the 5th reference block, the 6th reference block and the 7th reference block.These test block materials and typical extra-high voltage SF
6shell of circuit breaker material 06Cr19Ni10(304) consistent.It is thick that reference block specification is the wide * of the long * of 300*30*16mm().There is welded seam area in body 12 center of reference block, side or the bottom surface of mother metal region (non-welded seam area) and welded seam area are provided with horizontal through hole 13, hyphen hole 14 or wedge angle groove 15.
The first described reference block, arranges a horizontal through hole 13 in the side, mother metal region apart from surperficial 3mm, horizontal through-hole diameter Ф 2mm, long 30mm; Axis of a weld apart from surperficial 3mm also arranges a horizontal through hole 13, horizontal through-hole diameter Ф 2mm, long 30mm.
The second described reference block, arranges a horizontal through hole 13 in the side, mother metal region apart from surperficial 8mm, horizontal through-hole diameter Ф 2mm, long 30mm; Axis of a weld apart from surperficial 8mm also arranges a horizontal through hole 13, horizontal through-hole diameter Ф 2mm, long 30mm.
The 3rd described reference block, arranges a horizontal through hole 13 in the side, mother metal region apart from surperficial 4mm, horizontal through-hole diameter Ф 2mm, long 30mm; A horizontal through hole 13 is also set in the weld heat-affected zone side apart from surperficial 4mm, horizontal through-hole diameter Ф 2mm, long 30mm.
The 4th described reference block, arranges a horizontal through hole 13 in the side, mother metal region apart from surperficial 10mm, horizontal through-hole diameter Ф 2mm, long 30mm; A horizontal through hole 13 is also set in the weld heat-affected zone side apart from surperficial 10mm, horizontal through-hole diameter Ф 2mm, long 30mm.
The 5th described reference block, the bottom surface in its mother metal region arranges a wedge angle groove 15, this wedge angle flute length 2mm, high 2mm; The welded seam area bottom surface be positioned on axis of a weld also arranges a same wedge angle groove.
The 6th described reference block, it arranges a hyphen hole in the side, mother metal region apart from surperficial 8mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 8mm also arranges a same hyphen hole.
The 7th described reference block, it arranges a hyphen hole 14 in the side, mother metal region apart from surperficial 4mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 4mm also arranges a same hyphen hole 14.
Described extra-high voltage SF
6isolating switch butt-weld Ultrasonic Detection sensor special twin crystal focuses on transverse wave sensor, can produce the shear wave of specific refraction angle within the workpiece, and focus on the 10mm degree of depth.Described twin crystal focuses on transverse wave sensor, is provided with left voussoir 2 and right voussoir 3 side by side in its screening can 1; The bottom surface of left voussoir 2 and right voussoir 3 is surface level, and upper surface all has inclined-plane, and this inclined-plane has transverse direction and forward direction inclination angle, the inclined-plane of described left voussoir 2 and right voussoir 3 is arranged respectively left transmission piezoelectric wafer 4 and rightly accepts piezoelectric chip 5; Described left transmission piezoelectric wafer 4 with right accept piezoelectric chip 5 matching connection inductance 6 after be connected transmitting probe 7 and receiving transducer 8 more respectively, transmitting probe 7 and receiving transducer 8 are fixed on screening can 1.Be provided with sound insulating layer 9 between described left voussoir and right voussoir, this sound insulating layer keeps apart two piezoelectric chips, launches acoustic beam and the mutual interference and the obstruction that reflect acoustic beam for overcoming; The inside filling sucting sound material of described left voussoir and right voussoir, acoustic absorbant is for absorbing clutter.When sensor uses, place it on workpiece, described transmitting probe is connected with digital supersonic instrument 11 by probe wire 10 with receiving transducer.
In the present embodiment, detected object is certain extra-high voltage SF
6the first reference block that Shell of circuit breaker is made and the 7th reference block, test Detection results of the present invention.The step of the implementation case is as follows: supersonic detection device delay calibration; Supersonic detection device angle calibration system; DAC Drawing of Curve; The signal to noise ratio (S/N ratio) of test pick-up unit; The resolving power of test pick-up unit.
1, supersonic detection device delay calibration
Described delay calibration, refer to utilize the electronics trigger instants of the R50 cambered surface correcting probe of semicircle test block and acoustic beam to enter measured workpiece moment between delay, to draw the survey measurements of accurate sound path.
2, supersonic detection device angle calibration system
Described angle calibration system, refers to and utilizes the hyphen hole of the 6th reference block to calibrate the incident angle of probe, to draw the survey measurements of the accurate degree of depth, surface distance.
3, DAC Drawing of Curve
The horizontal through hole distance-amplitude curve of described mapping weld seam (DAC curve), refer to the horizontal through hole 30 × Ф 2mm in use first reference block, the second reference block, the 3rd reference block and the 4th reference block weld seam, on ultrasonic detection instrument, drafting horizontal ordinate is distance, and ordinate is the curve of horizontal through hole reflection wave height.As shown in figure 14.
4, the signal to noise ratio (S/N ratio) of pick-up unit is tested
Described signal to noise ratio (S/N ratio) refers to that above useful minimum flaw indication amplitude and the ratio of useless maximum noise amplitude are shielded in oscillography.With the 7th reference block, Weld pipe mill Ф 1 × 6mm hyphen hole, 12mm place (test block reverse side) reflection echo H
letterwith noise clutter H
make an uproarbetween decibel difference represent the size of signal to noise ratio (S/N ratio), i.e. Δ=20lg(H
letter/ H
make an uproar).
Such as, as shown in figure 13, in this figure, noise has had a strong impact on the judgement of flaw echo to common detection methods signal to noise ratio (S/N ratio) test result, very easily causes erroneous judgement, flaw echo 60%, grain noise about 20%, signal to noise ratio (S/N ratio)=
dB.
Test result of the present invention as shown in figure 14, can tell the echo in hyphen hole clearly, and overall noise level is very low, grain noise about 3% from figure, and signal to noise ratio (S/N ratio) is very good,
dB.
Visible, detection method of the present invention significantly improves the signal to noise ratio (S/N ratio) of detection.
5, the resolving power of pick-up unit is tested
Minor increment both when the resolving power of described resolving power ultrasonic testing system refers to and can provide separable instruction to a certain size a two neighboring reflection body.Resolving power of the present invention is with the 13mm(test block reverse side of the first reference block) first and second ripple of the horizontal through hole of place Ф 2mm tests.
As shown in figure 15, Echo width is larger for common detection methods resolution test result, two echo not can completely separation, resolving power 20log(80/25)=10dB.
As shown in figure 16, the primary event that this probe significantly can tell the first reference block involves secondary reflection ripple to test result of the present invention, has very high resolving power, and resolving power is 20log(80/3)=28.5dB.Detection method of the present invention substantially increases the resolving power of detection.
Claims (10)
1. extra-high voltage SF
6shell of circuit breaker supersonic detection device, is characterized in that, comprises twin crystal and focuses on transverse wave sensor and the special reference block of Ultrasonic Detection,
Described twin crystal focuses on transverse wave sensor and comprises screening can (1), is provided with left voussoir (2) and right voussoir (3) in described screening can (1) side by side; The bottom surface of left voussoir (2) and right voussoir (3) is surface level, upper surface all has inclined-plane, this inclined-plane has transverse direction and forward direction inclination angle, the inclined-plane of described left voussoir (2) and right voussoir (3) is arranged respectively left transmission piezoelectric wafer (4) and rightly accepts piezoelectric chip (5);
Described left transmission piezoelectric wafer (4) with right accept piezoelectric chip (5) matching connection inductance (6) after be connected transmitting probe (7) and receiving transducer (8) more respectively;
The special reference block of described Ultrasonic Detection comprises semicircle test block, the first reference block, the second reference block, the 3rd reference block, the 4th reference block, the 5th reference block, the 6th reference block and the 7th reference block, and described test block is made up of 304 austenitic stainless steels;
Described reference block comprises body (12), there is welded seam area in the center of described body, the side in welded seam area and mother metal region or bottom surface have horizontal through hole (13), hyphen hole (14) or wedge angle groove (15).
2. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, is provided with sound insulating layer (9) between described left voussoir and right voussoir, and this sound insulating layer keeps apart two piezoelectric chips, launches acoustic beam and the mutual interference and the obstruction that reflect acoustic beam for overcoming; The inside filling sucting sound material of described left voussoir and right voussoir, acoustic absorbant is for absorbing clutter.
3. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the first described reference block, and it arranges a horizontal through hole in the side, mother metal region apart from surperficial 3mm, and the diameter of this horizontal through hole is 2mm; Axis of a weld apart from surperficial 3mm also arranges a same horizontal through hole.
4. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the second described reference block, and it arranges a horizontal through hole in the side, mother metal region apart from surperficial 8mm, and the diameter of this horizontal through hole is 2mm; Axis of a weld apart from surperficial 8mm also arranges a same horizontal through hole.
5. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the 3rd described reference block, and it arranges a horizontal through hole in the side, mother metal region apart from surperficial 4mm, and the diameter of this horizontal through hole is 2mm; A same horizontal through hole is also set in the weld heat-affected zone side apart from surperficial 4mm.
6. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the 4th described reference block, and it arranges a horizontal through hole in the side, mother metal region apart from surperficial 10mm, and the diameter of this horizontal through hole is 2mm; A same horizontal through hole is also set in the weld heat-affected zone side apart from surperficial 10mm.
7. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the 5th described reference block, and its bottom surface, mother metal region arranges a wedge angle groove, this wedge angle flute length 2mm, high 2mm; The welded seam area bottom surface be positioned on axis of a weld also arranges a same wedge angle groove.
8. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the 6th described reference block, and it arranges a hyphen hole in the side, mother metal region apart from surperficial 8mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 8mm also arranges a same hyphen hole.
9. extra-high voltage SF according to claim 1
6shell of circuit breaker supersonic detection device, is characterized in that, the 7th described reference block, and it arranges a hyphen hole in the side, mother metal region apart from surperficial 4mm, and the diameter in this hyphen hole is 1mm, length is 6mm; Axis of a weld apart from surperficial 4mm also arranges a same hyphen hole.
10. extra-high voltage SF described in any one of claim 1-9
6the detection method of Shell of circuit breaker supersonic detection device, its step is as follows: 1) supersonic detection device delay calibration, namely the delay between the moment utilizing the electronics trigger instants of the cambered surface correcting probe of semicircle test block and acoustic beam to enter measured workpiece, to draw the survey measurements of accurate sound path; 2) supersonic detection device angle calibration system, namely utilizes the hyphen hole of the 6th reference block to calibrate the incident angle of probe, to draw the survey measurements of the accurate degree of depth, surface distance; 3) the horizontal through hole distance-amplitude curve of weld seam is drawn, namely the horizontal through hole 30 × Ф 2 in the first reference block, the second reference block, the 3rd reference block and the 4th reference block weld seam is used, on ultrasound measuring instrument, drafting horizontal ordinate is distance, and ordinate is the curve of horizontal through hole reflection wave height; 4) signal to noise ratio (S/N ratio) of pick-up unit is tested; 5) resolving power of pick-up unit is tested; 6) extra-high voltage SF
6isolating switch butt-weld detects, and namely carries out zigzag scan Z in weld seam both sides, uses focusing shear wave butt welded seam quality to assess.
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| CN106020573A (en) * | 2016-05-18 | 2016-10-12 | 成都吉锐时代触摸技术有限公司 | Writing method for ultrasonic pen |
| CN111413412A (en) * | 2019-01-04 | 2020-07-14 | 国电锅炉压力容器检验有限公司 | Method for measuring refraction angle of ultrasonic probe |
| CN111413413A (en) * | 2019-01-04 | 2020-07-14 | 国电锅炉压力容器检验有限公司 | Test block for measuring refraction angle of ultrasonic probe |
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