CN103439157A - Test block for digital radiographic detection of disc insulator point defects and manufacturing method of test block - Google Patents
Test block for digital radiographic detection of disc insulator point defects and manufacturing method of test block Download PDFInfo
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- CN103439157A CN103439157A CN2013103557652A CN201310355765A CN103439157A CN 103439157 A CN103439157 A CN 103439157A CN 2013103557652 A CN2013103557652 A CN 2013103557652A CN 201310355765 A CN201310355765 A CN 201310355765A CN 103439157 A CN103439157 A CN 103439157A
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Abstract
The invention discloses a test block for digital radiographic detection of disc insulator point defects and a manufacturing method of the test block. The test block adopts a three-step blocky structure made from a mixture of epoxy resin and aluminium oxide powder; the heights of the upper surfaces of the three steps are 25-35 mm, 55-65 mm and 85-95 mm respectively from the bottom up; a plurality of flat-bottomed holes with different hole diameters are formed in the upper surface of each step. The minimum point defects which can be detected by a detecting system are determined by utilizing the differences of ray absorbed doses of the flat-bottomed holes with different depths in the surfaces of the steps and observing the minimum detectable hole diameters of disc insulator point defects with different thicknesses in the case of different distances between a detected part and an imaging plate, so that the point defect detection sensitivity of the digital radiographic detecting system is judged conveniently and visually.
Description
Technical field
The present invention relates to a kind of disc insulator spot defect digital radial checkout equipment, relate in particular to a kind of GIS disc insulator spot defect digital radial and detect test block and method for making.
Background technology
GIS Chinese full name is the metal-insulator metal enclosed switch, is the core component of modern power network.The GIS parts are comprised of center conductor, operating parts, housing and disc insulator, and the sulfur hexafluoride insulating gas is filled in inner space.Disc insulator adopts compound substance, after being stirred by epoxy resin and alumina powder mechanical mixture, and vacuum casting moulding in metal die.Disc insulator is the benzvalene form structure, and central upper portion is inlayed cylindric center conductor, and lower basin is disc insulator and GIS cylindrical shell connecting portion along outstanding position.Between the general 60mm-90mm of 1000KV circuit disc insulator thickness, basin is high between 300mm-400mm; 500KV disc insulator thickness is generally between 40mm-70mm, and basin is high between 250mm-350mm; The following disc insulator thickness of 500KV is generally between 25mm-40mm, and basin is high between 200mm-300mm.Disc insulator is formed by epoxy resin and the casting of alumina powder mixing final vacuum, major defect is imperfect bonding between the stress rupture that causes of crackle, pore, snotter, insulation basin Density inhomogeneity and center cylindrical conductor and insulation basin, wherein, the defect such as pore, point-like inclusion belongs to spot defect.Need to bear because disc insulator is in operation the impulsive force that stress that gaseous tension, temperature variation produce and mechanically actuated produce, above several defects all may cause the disc insulator discharge breakdown that is in operation, and cause the whole piece line outage.Particularly the spot defect such as pore is more due to quantity, on technique, be difficult to control, the formed gas gap of spot defect will cause effluve, and the heat energy of discharge generation will cause the disc insulator carbonization, cause the Whole Equipment failure of insulation, cause serious industrial accident.
For fear of the industrial accident caused by the disc insulator spot defect, in the disc insulator production run, need to the quality of disc insulator be detected.Disc insulator quality determining method commonly used is the digital radial detection method.In the digital radial detection method, digital radial imaging sensitivity critical parameter has 3, is respectively spatial resolution, pixel and density resolution.Spatial resolution is the least limit of the close region physical dimension (minor detail) that can recognize in digital picture, namely to the resolution characteristic of image detail.Pixel is the minimum unit in the flat panel detector digitalized image.Density resolution is the least limit that can recognize adjacent area density (or gray scale) difference in the image visual field in image, i.e. the resolution characteristic of trickle density (gray scale) difference.Density resolution and spatial resolution are two aspects of resolving power index, and resolving power also is resolving power, distinguish the ability of two adjacent area images or image while being the image forming medium imaging.This three aspects: joint effect disc insulator spot defect digital radial detection sensitivity.In actual production, need to be tested disc insulator spot defect digital radial detection sensitivity, be verified the reliability that digital radial detection system spot defect detects.
Summary of the invention
The purpose of this invention is to provide a kind of disc insulator spot defect digital radial and detect test block and method for making, in the test section distance of positions, the minimum detectable range during from the imaging plate different distance goes out aperture to the spot defect that can test the disc insulator different-thickness, can pass judgment on easily and intuitively digital radial detection system spot defect detection sensitivity.
The present invention adopts following technical proposals:
A kind of disc insulator spot defect digital radial detects test block, described disc insulator spot defect digital radial detects the three ladder block structures of test block for being mixed by epoxy resin and alumina powder material, between 25mm-35mm, 55mm-65mm, 85mm-95mm, each ladder upper surface is provided with the different flat-bottom hole in a plurality of apertures to the upper level of three ladders respectively from bottom to up.
Described flat-bottom hole is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes is 10mm.
Described each ladder upper surface is provided with 6 flat-bottom holes, and the hole depth of each flat-bottom hole is identical with aperture, and the aperture of 6 flat-bottom holes is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm.
The described upper level of three ladders from bottom to up is respectively 30mm, 60mm and 90mm.
The width of described three ladders is 40mm, and length is 100mm.
A kind of disc insulator spot defect digital radial detects the method for making of test block, comprises the following steps:
A: three ladder casting die inside are cleaned, vacuumized after drying;
B: epoxy resin and alumina powder material are evenly mixed to rear heating, pour in three ladder casting dies by three ladder casting die spouts, and carry out curing molding twice, obtain three ladder blocks after the demoulding;
C: three ladder block rising heads and edge processing are smooth, and three step-thickness are adjusted at respectively between 25mm-35mm, 55mm-65mm, 85mm-95mm;
D: the upper surface at each ladder of three ladders is processed the different flat-bottom hole in a plurality of apertures, and flat-bottom hole is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes is 10mm.
In described C step, three step-thickness are respectively 30mm, 60mm and 90mm.
In described C step, the width of three ladders is 40mm, and length is 100mm.
In described D step, the upper surface of each ladder is processed with 6 flat-bottom holes, and the hole depth of each flat-bottom hole is identical with aperture, and the aperture of 6 flat-bottom holes is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm.
Also comprise step e, at each 4mm place, flat-bottom hole edge, paste the font reference numbers.
Utilization of the present invention is arranged on the difference of the flat-bottom hole correlation line absorption dosage of stepped surfaces different depth, in the test section distance of positions, the minimum detectable range during from the imaging plate different distance goes out aperture to disc insulator spot defect by observing different-thickness, determine the minimum spot defect that detection system can detect, thereby pass judgment on easily and intuitively digital radial detection system spot defect detection sensitivity.
The accompanying drawing explanation
Fig. 1 is the structural representation that disc insulator spot defect digital radial of the present invention detects test block.
Embodiment
As shown in Figure 1, disc insulator spot defect digital radial of the present invention detects the three ladder block structures of test block for being mixed by epoxy resin and aluminium powder material, the width of three ladders is 40mm, length is 100mm, between 25mm-35mm, 55mm-65mm, 85mm-95mm, each ladder upper surface is provided with the different flat-bottom hole in a plurality of apertures 1 to the upper level of three ladders respectively from bottom to up; Flat-bottom hole 1 is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes 1 is 10mm.In the present embodiment, each ladder upper surface is provided with 6 flat-bottom holes 1, the hole depth of each flat-bottom hole 1 is identical with aperture, and the aperture of 6 flat-bottom holes 1 is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, and the upper level of three ladders is respectively 30mm, 60mm and 90mm from bottom to up.
Disc insulator spot defect digital radial of the present invention detects the method for making of test block, comprises the following steps:
A: three ladder casting die inside are cleaned, vacuumized after drying;
B: epoxy resin and alumina powder material are evenly mixed to rear heating, pour in three ladder casting dies by three ladder casting die spouts, and carry out curing molding twice, obtain three ladder blocks after the demoulding;
C: three ladder block rising heads and edge processing are smooth, and three step-thickness are adjusted at respectively between 25mm-35mm, 55mm-65mm, 85mm-95mm;
D: the upper surface at each ladder of three ladders is processed the different flat-bottom hole in a plurality of apertures 1, and flat-bottom hole 1 is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes 1 is 10mm;
E: at each flat-bottom hole 1 4mm place, edge, paste the font reference numbers.
In the present embodiment, three step-thickness are respectively 30mm, 60mm and 90mm; The width of three ladders is 40mm, and length is 100mm; The upper surface of each ladder of three ladders is processed with 6 flat-bottom holes 1, and the hole depth of each flat-bottom hole 1 is identical with aperture, and the aperture of 6 flat-bottom holes 1 is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm.
In carrying out the digital radial detection, digital radial imaging sensitivity critical parameter has 3, is respectively spatial resolution, pixel, density resolution.During the close imaging plate of spot defect, its density resolution is better, but spatial resolution is poorer; Otherwise during away from imaging plate, its spatial resolution is better when spot defect, but density resolution is poorer.So, there is an appropriate distance, on this distance, space resolution and density resolution can be accepted, and make digital radial sensitivity reach best, and this distance is exactly the optimum distance in the digital radial transillumination.Detect test block by disc insulator spot defect digital radial, install the support of different distance additional, the imaging sensitivity in the time of can testing spot defect Range Imaging plate different distance, thus determine optimum distance.
When using disc insulator spot defect digital radial detection test block of the present invention to carry out disc insulator spot defect digital radial sensitivity detection, beam is vertically passed to test block, then receive ray by imaging device and form image, utilize the difference of the flat-bottom hole 1 correlation line absorption dosage of different depth, in the test section distance of positions, the minimum detectable range during from the imaging plate different distance goes out aperture to disc insulator spot defect by observing different-thickness, determine the minimum spot defect that detection system can detect, thereby pass judgment on easily and intuitively digital radial detection system spot defect detection sensitivity.
Claims (10)
1. a disc insulator spot defect digital radial detects test block, it is characterized in that: described disc insulator spot defect digital radial detects the three ladder block structures of test block for being mixed by epoxy resin and alumina powder material, between 25mm-35mm, 55mm-65mm, 85mm-95mm, each ladder upper surface is provided with the different flat-bottom hole in a plurality of apertures to the upper level of three ladders respectively from bottom to up.
2. disc insulator spot defect digital radial according to claim 1 detects test block, and it is characterized in that: described flat-bottom hole is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes is 10mm.
3. disc insulator spot defect digital radial according to claim 2 detects test block, it is characterized in that: described each ladder upper surface is provided with 6 flat-bottom holes, the hole depth of each flat-bottom hole is identical with aperture, and the aperture of 6 flat-bottom holes is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm.
4. disc insulator spot defect digital radial according to claim 3 detects test block, and it is characterized in that: the described upper level of three ladders from bottom to up is respectively 30mm, 60mm and 90mm.
5. disc insulator spot defect digital radial according to claim 4 detects test block, and it is characterized in that: the width of described three ladders is 40mm, and length is 100mm.
6. the method for making of a disc insulator spot defect digital radial detection test block, is characterized in that, comprises the following steps:
A: three ladder casting die inside are cleaned, vacuumized after drying;
B: epoxy resin and alumina powder material are evenly mixed to rear heating, pour in three ladder casting dies by three ladder casting die spouts, and carry out curing molding twice, obtain three ladder blocks after the demoulding;
C: three ladder block rising heads and edge processing are smooth, and three step-thickness are adjusted at respectively between 25mm-35mm, 55mm-65mm, 85mm-95mm;
D: the upper surface at each ladder of three ladders is processed the different flat-bottom hole in a plurality of apertures, and flat-bottom hole is centered close on the cascaded surface cross central line, and the spacing of adjacent two flat-bottom holes is 10mm.
7. disc insulator spot defect digital radial according to claim 6 detects the method for making of test block, and it is characterized in that: in described C step, three step-thickness are respectively 30mm, 60mm and 90mm.
8. disc insulator spot defect digital radial according to claim 7 detects the method for making of test block, and it is characterized in that: in described C step, the width of three ladders is 40mm, and length is 100mm.
9. disc insulator spot defect digital radial according to claim 8 detects the method for making of test block, it is characterized in that: in described D step, the upper surface of each ladder is processed with 6 flat-bottom holes, the hole depth of each flat-bottom hole is identical with aperture, and the aperture of 6 flat-bottom holes is respectively 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm.
10. disc insulator spot defect digital radial according to claim 9 detects the method for making of test block, it is characterized in that: also comprise step e, at each 4mm place, flat-bottom hole edge, paste the font reference numbers.
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| CN105004742A (en) * | 2015-08-05 | 2015-10-28 | 南车青岛四方机车车辆股份有限公司 | Image quality indicator and radiographic testing quality judgment method applying same |
| CN109100538A (en) * | 2017-06-21 | 2018-12-28 | 北京振兴计量测试研究所 | A kind of isolator detecting tool |
| 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 |
| CN112881533A (en) * | 2021-01-20 | 2021-06-01 | 西北工业大学 | Ultrasonic detection test block and preparation method thereof |
| CN113484343A (en) * | 2021-06-25 | 2021-10-08 | 成都飞机工业（集团）有限责任公司 | Detection method for detection performance of hole type defects of 3D printing workpiece |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105004742A (en) * | 2015-08-05 | 2015-10-28 | 南车青岛四方机车车辆股份有限公司 | Image quality indicator and radiographic testing quality judgment method applying same |
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| CN109100538B (en) * | 2017-06-21 | 2021-02-26 | 北京振兴计量测试研究所 | Microwave insulator detects frock |
| 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 |
| CN112881533A (en) * | 2021-01-20 | 2021-06-01 | 西北工业大学 | Ultrasonic detection test block and preparation method thereof |
| CN113484343A (en) * | 2021-06-25 | 2021-10-08 | 成都飞机工业（集团）有限责任公司 | Detection method for detection performance of hole type defects of 3D printing workpiece |
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| CN103439157B (en) | 2016-04-27 |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: Henan Electric Power Corporation Electric Power Science Research Institute |
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Effective date of registration: 20151019 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Applicant after: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute |
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Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee after: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee after: State Grid Corporation of China Co-patentee after: Henan jiuyu enpai Power Technology Co.,Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Co-patentee before: STATE GRID HENAN ELECTRIC POWER CORPORATION ELECTRIC POWER SCIENCE Research Institute Patentee before: State Grid Corporation of China Co-patentee before: HENAN ENPAI HIGH-TECH GROUP Co.,Ltd. |