CN102980891A - Hydrophobicity test system for composite insulator - Google Patents
Hydrophobicity test system for composite insulator Download PDFInfo
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- CN102980891A CN102980891A CN 201210480902 CN201210480902A CN102980891A CN 102980891 A CN102980891 A CN 102980891A CN 201210480902 CN201210480902 CN 201210480902 CN 201210480902 A CN201210480902 A CN 201210480902A CN 102980891 A CN102980891 A CN 102980891A
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- 239000012212 insulator Substances 0.000 title claims abstract description 84
- 239000002131 composite material Substances 0.000 title claims abstract description 48
- 238000012360 testing method Methods 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 17
- 230000007246 mechanism Effects 0.000 claims abstract description 9
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 238000003709 image segmentation Methods 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 19
- 238000011109 contamination Methods 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 4
- 238000000638 solvent extraction Methods 0.000 abstract 2
- 238000001931 thermography Methods 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 description 9
- 230000032683 aging Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000009422 external insulation Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229910052573 porcelain Inorganic materials 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
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- 238000012986 modification Methods 0.000 description 3
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- 239000000919 ceramic Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
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- 230000018109 developmental process Effects 0.000 description 2
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
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- 230000002902 bimodal effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- -1 contain plug Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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Abstract
The invention discloses a hydrophobicity test system for a composite insulator, and belongs to the field of power part test systems. The system comprises a water spraying mechanism, an infrared thermal imaging system and a system computer, wherein an image and data processing module is arranged in the system computer; and more than one image partitioning module is arranged in the image and data processing module. An image can be partitioned by two different partitioning devices; the test adaptability can be improved on the basis of the original system; and the system is simple in structure, easy to implement and convenient to use and convert.
Description
Technical field
The present invention relates to a kind of composite insulator test macro, particularly a kind of Hydrophobicity of Composite Insulator test macro that utilizes infrared imaging belongs to power components test macro field.
Background technology
Composite insulator, be also referred to as composite organic insulator, rubber insulator or non-porcelain insulator, it forms the composite structure insulator by the organic synthesis material, mainly contain plug, gold utensil, umbrella sheath and adhesive linkage form, gold utensil is the transferring elements of the mechanical load of composite insulator, it and plug fit together the web member that consists of composite insulator, the quality of structure has influence on the performance of mandril strength and the engineering properties of insulator, umbrella sheath is the external insulation part of composite insulator, its effect is to make composite insulator have the external insulation performance of sufficiently high moisture-resistant sudden strain of a muscle and pollution flashover, the protection plug is avoided atmospheric corrosion, plug is the load bearing component of composite insulator mechanical load, be again the critical piece of interior insulation simultaneously, an adhesive linkage part is to finish being connected between sheath and the plug with adhesive glue; Another part is to finish connection between the full skirt with casting glue.The quality of bonding quality is directly connected to the level of interior insulation, composite insulator is compared with conventional ceramic or glass insulator, have following advantage: the one, mechanical property is superior: plug is made by epoxy glass fiber, its tensile strength is 1.5 times of ordinary steels, be 3～4 times of high-strength ceramics, axial tension is strong especially, and has stronger vibration absorption ability, the shock resistant damping performance is very high, is porcelain insulator 1/7～1/10; The 2nd, anti-soil dodges that performance is good, and composite insulator has hydrophobic nature, and insulator umbrella shape corrugated surface can not bedew the formation moisture film when raining, and is globule shape drippage, is difficult for consisting of conductive channel, and its pollution flashover voltage is higher, for 3 times of electric pressure porcelain insulators; The 3rd, electric erosion resistance is excellent: insulator surface electric leakage flashover forms the bad change of nonreversibility and plays the trace phenomenon, and general standard is for being not less than 4.5 grades (being 4.5kV), and composite insulator is 6～7 grades; The 4th, ageing resistance is good: detect through practice and show, composite insulator slightly deepened except color and specific inductive capacity and dielectric loss angle have increased slightly, effects on surface not adhesional wetting property and the marks rising property of anti-the galvanic corrosion was all unchanged, illustrates that ageing resistance is good; The 5th, structural stability is good: general porcelain suspended insulator is interior glue assembling structure, couple corrosion, and in service can the generation hanged down the null value insulation resistance, be outer glue assembling structure and close insulator, its heart is the solid bar insulating material, does not deposit deteriorated making a joint attack on and wears, and zero resistance insulator can not occur; The 6th, the circuit operational efficiency is high: composite insulator wind and rain self-cleaning is good, does not produce again zero resistance insulator, so cleaning inspection work can change per 4～5 years into once, shortens maintenance, power off time; The 7th, lightweight, contain into that the insulator own wt gently transports, in the construction operation, can greatly alleviate intensity of workers.These advantages make it in that worldwide development and application is very fast, especially bring into use at the beginning composite insulator in China very swift and violent China of development in the 80's of 20th century, the 80's Mos of 20th century, China's electrical network has successively been finished research and development and the industrialization of composite insulator, at the beginning of the 90's, composite insulator is introduced China's electrical network in a large number.According to incompletely statistics, composite insulator has shown good less trouble in the large tracts of land pollution flashover accident, but the operation practice shows simultaneously, composite insulator and the generation that can stop pollution flashover accident, operating composite insulator has equally pollution flashover accident and occurs, the anti-pollution flashover ability that composite insulator is good will depend on rational external insulation state equally, and the composite insulator external insulation is relevant with Hydrophobicity of Composite Insulator to a great extent, composite insulator is subject to electric field in operational process, ultraviolet ray, occur aging under the condition combined actions such as filth, this aging Hydrophobicity of Composite Insulator that causes descends, the composite insulator of serious aging even forfeiture hydrophobicity performance, the composite insulator pollution flashover voltage is descended, the probability that pollution flashover occurs increases, and has reduced the reliability of Operation of Electric Systems.For in time finding the accident potential of composite insulator, avoid burst accident, improve the safe reliability of transmission line of electricity operation, need compound inslation hydrophobic nature test evaluation system comparatively accurately, the method that composite insulator hydrophobic grade detects mainly comprises: the Static Contact horn cupping, surface tension method, water spray stage method and pass judgment on based on the hydrophobicity rank of Digital Image Processing, its neutralization is adopted infrared imagery technique based on the hydrophobic nature of Digital Image Processing, adopt Computer Processing computing contrast to judge hydrophobicity rank because easy operating is realized, processing speed is fast, the advantage such as can the scene carrying out is rapidly developed in recent years, but these class methods need comparatively accurate image processing techniques, system in the past adopts a kind of pattern substantially, various insulators are adopted same set of trace routine and device, bad adaptability, error occurs easily in some occasion, in this class device, water spray institute water is generally tap water meeting pure water, a situation arises that certain difference is arranged with flashover under the actual behaviour in service, causes the application of test result bad.
Summary of the invention
The present invention is for providing a kind of composite insulator test macro, and this system can adapt to other composite insulator test of various filthy levels comparatively accurately.
A kind of composite insulator test macro provided by the present invention, comprise water spraying mechanism, thermal infrared imager, system computer, be provided with image and data processing module in the system computer, described image and data processing module are provided with the image segmentation module more than, described image and data processing module are provided with the image segmentation module more than, use according to composite insulator pollution level different choice, select an image segmentation module when insulator contamination is heavy, select No. two image segmentation modules when insulator contamination is light, be implanted with in the described image segmentation module and adopt one dimension histogram threshold method to carry out the device of image segmentation, be implanted with in the described No. two image segmentation modules and adopt maximum variance between clusters to carry out the device of image segmentation, be provided with water receptacle on the described water spraying mechanism, the water in the described water receptacle is rainwater or the aqueous solution that becomes assignment system according to rainwater.
Image segmentation is based on the core technology that thermal infrared imager is measured Hydrophobicity of Composite Insulator, the design and running of image Segmentation Technology scheme directly determine test result accurately and can be with reference to degree, a kind of composite insulator test macro provided by the present invention, when image is processed, adopted two kinds of different segmenting devices to carry out image segmentation, in the heavier situation of filth, background and target peak difference are apparent in view, select No. one the image segmentation module, adopt one dimension histogram threshold method to carry out image segmentation, can better finish faster the difference between the target and background, finish comparatively accurately image segmentation, in the lighter situation of filth, background and target peak difference are not fairly obvious, select No. two the image segmentation module, adopt maximum variance between clusters to carry out image segmentation, adopt one dimension histogram threshold method to carry out the filthy situation of the more approaching reality of result that image segmentation obtains, the used water of water spraying mechanism is rainwater or the aqueous solution that becomes assignment system according to rainwater, make test result closer to practical situations, the native system simple structure, be easy to realize, use conversion convenient, be applied to judge in the composite insulator test macro based on the hydrophobic grade contrast of infrared thermoviewer, can improve on the basis of original system the adaptability of test.
Description of drawings
Fig. 1 is that tradition is based on the schematic flow sheet of the hydrophobic nature test macro of infrared thermal imagery.
Fig. 2 is the schematic flow sheet of hydrophobic nature test macro of the present invention
Embodiment
In order to explain more fully enforcement of the present invention, provide embodiment of the present invention.These embodiments only are the elaborations to this system, do not limit the scope of the invention.
Shown in attached, Fig. 1 is that tradition is based on the schematic flow sheet of the hydrophobic nature test macro of infrared thermal imagery, Fig. 1 is the schematic flow sheet of hydrophobic nature test macro of the present invention, in accompanying drawing 2,1 is water spraying mechanism, and 2 is thermal infrared imager, and 3 is insulator to be measured, 4 is computer system, 5 is an image segmentation module, and 7 are the denoising module, and 8 is the infrared thermal image features extraction module, 9 is the gradation for surface pollution identification module, 10 is computer system, and Fig. 2 has increased image segmentation module 6 No. two on the basis of Fig. 1, when carrying out the image segmentation processing, can select to adopt an image segmentation module 5 or No. two image segmentation modules.Hydrophobicity of Composite Insulator test macro of the present invention, comprise water spraying mechanism 1, thermal infrared imager 2, system computer 4, be provided with image and data processing module 10 in the system computer 4, described image and data processing module 10 are provided with the image segmentation module more than, described image and data processing module 10 are provided with the image segmentation module more than, use according to composite insulator pollution level different choice, select an image segmentation module 5 when insulator contamination is heavy, select No. two image segmentation modules 6 when insulator contamination is light, be implanted with in the described image segmentation module 5 and adopt one dimension histogram threshold method to carry out the device of image segmentation, be implanted with in the described No. two image segmentation modules 6 and adopt maximum variance between clusters to carry out the device of image segmentation, be provided with water receptacle on the described water spraying mechanism 1, the water in the described water receptacle is rainwater or the aqueous solution that becomes assignment system according to rainwater.
Infrared thermal imagery essence reflects each point temperature height in the photographed scene with the grey scale pixel value size, when insulator surface humidity larger, when filth is more serious, the insulator card with respect to the temperature rise of background clearly, background peaks and insulator peak can obviously be distinguished on image, on the one dimension histogram of pixel-intensity profile statistics, bimodal distribution is obvious, for such defilement and insulation subimage, adopt one dimension histogram thresholding method to obtain optimal segmenting threshold by searching two peak-to-peak troughs, insulator image after insulator binary map and the filtering multiplied each other obtain cutting apart rear insulator image, the insulator card can be cut out comparatively really, when pollution severity of insulators is serious, selects to be implanted with in image segmentation module 5 device that adopts one dimension histogram threshold method to carry out image segmentation and can obtain comparatively accurately the result.
When lighter grade of pollution severity of insulators, the temperature difference of insulator surface and background is less, insulator infrared thermal imagery gray-scale statistical histogram is unimodal, insulator and background no longer clearly show as two peak features, the peak-to-peak trough of two ripples disappears, so that can't use as the one dimension histogram thresholding method of image segmentation threshold with trough between two peaks, employing maximization Ostu method provided by the invention can address this problem preferably, this method is by average and the variance of statistics target area image gray scale, Optimality Criteria according to the maximization inter-class variance, the pixel of image is divided into background and target, boundary between this two classes pixel is the thresholding of image segmentation, the process that the maximization Ostu method is asked for optimal threshold F is: get all over 0～L-1 gray level by F, calculate inter-class variance corresponding to each F, the F value that maximum between-cluster variance is corresponding is segmentation threshold, when cutting apart, make pixel value remain more than or equal to the gray-scale value of the point (target) of F, make that pixel value is 0 less than the gray-scale value of the point (background) of F, target image is split from background, its concrete execution in step is as follows, below each letter be setting, can freely choose change
(1) gray level of computed image image is the number of pixels of j, draws the probability of occurrence P(j of each gray-scale pixels);
If gradation of image is the number of pixels of j is nj, then total pixel N of image is:
N=
Wherein j is gray shade scale, and h is the gray level number, and its value is 256, P(j)=and nj/N
(2) probability that occurs according to each gray scale obtains the overall gray level average K of image
T
K
T =
(3) calculate target class gray average K
MWith background classes gray average K
BAnd the probability W that occurs
MAnd W
B
(4) the variance ó between calculating target class and the background classes
2
ó
2=W
M（K
M – K
T ）
2 + W
B（K
B – K
T ）
2
(5) obtain and make the value of variance maximum be partition threshold;
(6) with the partition threshold split image, greater than threshold values be 1, less than threshold values be 0, obtain the insulator bianry image;
(7) from the insulator bianry image, card is split, obtain insulator card bianry image;
Above step is finished in described No. two image segmentation modules 6.
After describing embodiments of the present invention in detail, the personage who is familiar with this technology can be well understood to, can carry out various variations and modification not breaking away under above-mentioned claim and the spirit, any simple modification, equivalent variations and modification that all foundations technical spirit of the present invention is done above embodiment, the scope that all belongs to technical solution of the present invention, and the present invention also is not subject to the embodiment that gives an actual example in the instructions.
Claims (5)
1. Hydrophobicity of Composite Insulator test macro, comprise water spraying mechanism (1), thermal infrared imager (2), system computer (4), be provided with image and data processing module (10) in the system computer (4), it is characterized in that: described image and data processing module (10) are provided with the image segmentation module more than.
2. Hydrophobicity of Composite Insulator test macro according to claim 1, it is characterized in that: described image and data processing module (10) are provided with the image segmentation module more than, use according to composite insulator pollution level different choice, select an image segmentation module (5) when insulator contamination is heavy, select No. two image segmentation modules (6) when insulator contamination is light.
3. Hydrophobicity of Composite Insulator test macro according to claim 1 is characterized in that: be implanted with in the described image segmentation module (5) and adopt one dimension histogram threshold method to carry out the device of image segmentation.
4. Hydrophobicity of Composite Insulator test macro according to claim 1 is characterized in that: be implanted with in the described No. two image segmentation modules (6) and adopt maximum variance between clusters to carry out the device of image segmentation.
5. Hydrophobicity of Composite Insulator test macro according to claim 1, it is characterized in that: described water spraying mechanism is provided with water receptacle on (1), and the water in the described water receptacle is rainwater or the aqueous solution that becomes assignment system according to rainwater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210480902 CN102980891A (en) | 2012-11-23 | 2012-11-23 | Hydrophobicity test system for composite insulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210480902 CN102980891A (en) | 2012-11-23 | 2012-11-23 | Hydrophobicity test system for composite insulator |
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| CN102980891A true CN102980891A (en) | 2013-03-20 |
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| CN 201210480902 Pending CN102980891A (en) | 2012-11-23 | 2012-11-23 | Hydrophobicity test system for composite insulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196799A (en) * | 2013-04-10 | 2013-07-10 | 国家电网公司 | RTV (Room Temperature Vulcanization silicone rubber) hydrophobicity testing device |
| CN103411970A (en) * | 2013-07-17 | 2013-11-27 | 同济大学 | Alternating current transmission line insulator contamination condition detection method based on infrared thermography |
| CN103604755A (en) * | 2013-11-25 | 2014-02-26 | 国网山西省电力公司晋中供电公司 | Method for detecting ageing of umbrella skirt of silicon rubber composite insulator |
-
2012
- 2012-11-23 CN CN 201210480902 patent/CN102980891A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196799A (en) * | 2013-04-10 | 2013-07-10 | 国家电网公司 | RTV (Room Temperature Vulcanization silicone rubber) hydrophobicity testing device |
| CN103411970A (en) * | 2013-07-17 | 2013-11-27 | 同济大学 | Alternating current transmission line insulator contamination condition detection method based on infrared thermography |
| CN103604755A (en) * | 2013-11-25 | 2014-02-26 | 国网山西省电力公司晋中供电公司 | Method for detecting ageing of umbrella skirt of silicon rubber composite insulator |
| CN103604755B (en) * | 2013-11-25 | 2015-10-14 | 国网山西省电力公司晋中供电公司 | Silicon rubber compound insulator aging degree of umbrella skirt detection method |
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Application publication date: 20130320 |