CN105300323A - Shedding area detection method of RTV coating of insulator and detection device - Google Patents
Shedding area detection method of RTV coating of insulator and detection device Download PDFInfo
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- CN105300323A CN105300323A CN201510800260.1A CN201510800260A CN105300323A CN 105300323 A CN105300323 A CN 105300323A CN 201510800260 A CN201510800260 A CN 201510800260A CN 105300323 A CN105300323 A CN 105300323A
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Abstract
The invention discloses a shedding area detection method of an RTV coating of an insulator and a detection device. The detection method comprises following steps of removing dirt on the surface of the insulator; using colored liquid to smear damaged parts of surface RTV of the insulator; sleeving blank annular Chinese art paper on the surface of the insulator after all the damaged parts are smeared; flattening and arranging the annular Chinese art paper on which colored liquid marks are printed on a platform; acquiring the image of the Chinese art part via an image acquirer and sending the acquired image to a computer; using the computer to carry out profile extraction, area dividing and identification on the colored liquid marks on the Chinese art paper; and calculating quantity of pixel points so as to determine area of the colored liquid marks, i.e., the damaged area of surface RTV coating on the insulator. According to the invention, by taking a rubbing of damaged area on the Chinese art paper, the damaged parts of the surface RTV can be identified in an undamaged manner, and precision degree is high.
Description
Technical field
The present invention relates to a kind of detection method of RTV aging performance, particularly a kind of insulator RTV coating shedding area detecting method and pick-up unit.
Background technology
RTV coating, owing to having stronger hydrophobic nature, therefore can be used for being coated with and improve anti-fouling flashover performance on the insulator.RTV is high-molecular organic material, and in running at the scene, be subject to the erosion of the extraneous factors such as sunshine, wind and rain, surperficial Leakage Current, RTV coating easily occurs aging, and then the phenomenon that may occur be full of cracks, come off; Now there is obvious decline in the anti-fouling flashover performance of RTV coating, easily threatens to the safe operation of insulator.Therefore, the defect area detecting of RTV coating contributes to the aging conditions of operation maintenance personnel Timeliness coverage RTV coating insulation existence, the operation maintenance work of guide field insulator.
At present hydrophobic nature detection, the detection of water spray image, adhesion test, FTIR spectrum method etc. are mainly contained to the detection method of RTV aging performance.
Chinese patent CN104048913A discloses a kind of RTV material aging degree determination methods, in conjunction with the aging conditions of hydrophobic nature Measurement and analysis RTV coating, the hydrophobic nature of RTV is first eliminated by dielectric barrier discharge, measure static hydrophobic angle afterwards, obtain static hydrophobic Jiao ?time curve, analyze its characteristic quantity and comprise final value and contact angle rate of change, judged the degree of aging of RTV coating by analytical characteristic amount; Because insulator upper surface exists certain radian, and volume is comparatively large, not easily measures on hydrophobic contact angle measurement, and it is larger that the static contact angle therefore by measuring insulator surface analyzes difficulty in RTV aging conditions operability.
Chinese patent CN103674967A discloses a kind of RTV coating aging detection system, to be sprayed water image by image procossing, calculate globule area and then classification is carried out to aging conditions, containing quantitative water spray, image acquisition, image procossing, the several step of aging grade classification; When detecting hydrophobic nature by image after water spray, the globule exists light and shade change, be embodied on gray-scale map is that gray level changes calibration greatly, this feature makes the contrast of the globule and background not obvious, RTV surface exists stained simultaneously, image processing software may be mistaken for the globule, and these are all that the calculating of globule area brings error, cause judging that degree of aging is not accurate enough.
Chinese patent CN104297149A discloses a kind of method of testing of RTV antifouling flush paint adhesion, by testing the RTV coating adhesion running rear insulator surface, can provide Condition evaluation to running insulator for many years, to judge whether to need to change.Method of testing comprises two kinds: one is at ambient temperature, tests the adhesion of RTV coating, takes respective standard respectively to the insulator under new insulator and running status, takes stroke circle method or cross-hatching to test; Another kind be product to be measured act in hot environment 5 ?after 6h, take the adhesion drawing circle method or cross-hatching test RTV coating.Be suitable for being used in selective examination test to the test of RTV paint adhesion and move back on the insulator of fortune, because stroke circle method and cross-hatching all directly can damage RTV coating, be applicable to the state of RTV on forecast analysis batch insulator, be not suitable for nondestructively to the situation that RTV detects.
Chinese patent CN103760129A discloses a kind of detection method of room temperature vulcanized silicone rubber antifouling flush paint degree of aging, FTIR spectrum method is utilized to differentiate the ageing state of RTV, by sampling the RTV coating run on rear insulator, after clean surface filth, prepare sample, adopt FTIR spectrum method test sample, obtain infrared spectrogram, analyze absorption peak, judge whether RTV coating meets service requirement; Absorption peak based on FTIR spectrum detection analysis RTV coating stresses the physicochemical property examining or check RTV, is applicable to the agine mechaism of theoretical explanation RTV, and cannot fast and effeciently differentiates the aging defect situation of RTV.
Summary of the invention
The object of the present invention is to provide a kind of insulator RTV coating shedding area detecting method and pick-up unit.
The technical scheme realizing the object of the invention is:
A kind of insulator RTV coating damage area detecting method, comprises the following steps:
Step 1, removal pollution severity of insulators;
Step 2, employing colored liquid smear insulator surface RTV defect;
Step 3, smeared all defect after, the annular rice paper of blank is put insulator surface;
Step 4, the ring-shaped rice paper opening up upper colored liquid trace is shakeout after be placed on platform, by image acquisition device rice paper image, and the image collected is sent to computing machine;
Step 5, computing machine carry out contours extract and Region dividing to the colored liquid trace on rice paper, identify colored liquid trace region, define look liquid trace region area, i.e. the area of insulator upper surface RTV coating damage by calculating pixel quantity.
A kind of insulator RTV coating damage area detecting device, comprising:
For removing the cleaning plant of pollution severity of insulators;
For dipping colored liquid and the application device of uniform application insulator surface RTV defect part;
The blank ring-shaped rice paper of colored liquid trace is obtained for being enclosed within insulator surface;
For gathering the image collecting device of rice paper image; And
For calculating colored liquid areal of indentation size and determining the computing machine of RTV coating damage area.
Compared with prior art, its remarkable result is in the present invention:
(1) the present invention can describe the damaged area of insulator surface RTV coating and the number percent of shared whole surface area quantitatively, and effective guide field judges that insulator is the need of replacing;
(2) the present invention adopts rice paper to open up to get the method for defect area the defect part of nondestructively effects on surface RTV to identify, and levels of precision directly gathers insulator image higher than eye-observation and with camera;
(3) means of combining image identification of the present invention, when opening up after paper collection completes, identifying is comparatively quick, effectively can improve defect area recognition efficiency;
(4) the present invention can identify for the RTV defect situation of multiple insulator, applied range, strong adaptability, manually the isolated input information enhancement practicality of identification software;
(5) the present invention adopts camera radio transmitting image, and whole recognition device is easy to mobile, makes to use not limit by place, facilitates rig-site utilization.
Accompanying drawing explanation
Fig. 1 is insulator RTV coating damage area detecting method flow diagram of the present invention.
Fig. 2 is RTV coating inscription rubbing process schematic.
Fig. 3 is RTV coating defect area image recognition schematic diagram.
Fig. 4 is RTV coating defect area image recognition processing process flow diagram.
Embodiment
In order to effectively carry out quantitative detection to the damage condition of insulator surface RTV coating, composition graphs 1 ?Fig. 2, the present invention proposes a kind of RTV coating damage area detecting method based on image recognition, and concrete steps are:
Step 1, removal insulator 2 surface filth;
Step 2, employing colored liquid smear insulator surface RTV defect;
Step 3, smeared all defect after, the annular rice paper 5 of blank is put insulator surface;
Step 4, composition graphs 3, be placed on platform 6 after being shakeout by the ring-shaped rice paper opening up upper colored liquid trace, gather rice paper image, and the image collected is sent to computing machine 9 by image collecting device 7;
Colored liquid trace on step 5, computing machine 9 pairs of rice paper 5 carries out contours extract and Region dividing, identifies colored liquid trace region, defines look liquid trace region area, i.e. the area of insulator upper surface RTV coating damage by calculating pixel quantity.
Further, by light brush insulator 2 surface of hairbrush 1 in step 1, pollution severity of insulators is removed; Prevent because filthy foreign material cause being difficult to inking, and the possibility of opening up paper is stained in elimination filth.
Further, step 2 colored liquid adopts prepared Chinese ink, especially by the writing brush 3 dipping prepared Chinese ink, the place 4 of insulator surface RTV defect is retouched black, the amount of prepared Chinese ink just makes writing brush complete wetting not drip again, retouch black fractional wettability but the prepared Chinese ink not going out ready-made stock or become to drip, retouch in black process and keep writing brush to soak always.
Further, in step 3, use sponge to pat rice paper 5, the prepared Chinese ink of defect is opened up on rice paper completely, and don't occur the state that prepared Chinese ink scatters.
When defect area is larger, facsimile reproduction is successively carried out in the region that insulator should be split into two halves.
Further, in step 4, image collecting device is fixedly installed on directly over ring-shaped rice paper by brandreth 8, and camera lens and rice paper keeping parallelism;
The pixel quantity of shot image and the conversion ratio of size is obtained according to the focal length of this distance and camera, pixel.
As shown in Figure 4, step 5 image recognition processes comprises several link below: image acquisition, gray processing, binaryzation, objective contour identification, calculating objective contour area, calculating defect part percentage.
Grey level histogram is the function of gray level, represents the number in image with the pixel of certain gray level, reflects the frequency that in image, certain gray scale occurs, is to be obtained by the pixel count of gray-scale value at different levels in statistics piece image.The gray level of each pixel in horizontal ordinate presentation image, ordinate is the number of times or probability that in each gray level, each pixel of image occurs; Grey level histogram can obtain by carrying out statistics to the matrix form of image.
Utilize maximum variance between clusters to ask for gray threshold: setting gray threshold t, gray scale in described image is less than the part that the part of described gray threshold t and described gradation of image be greater than gray threshold t and is divided into target object area and background area respectively; Wherein, described target object area and described background area account for the area ratio of described image respectively and are
with
and meet:
Wherein, n
krepresent the pixel count comprised in kth level gray scale in described image, J is total progression of described gradation of image, and n represents the sum of all pixels of described image, and make the average gray of whole image be μ, the average gray of described target object area and background area is respectively μ
1, μ
2, then:
The gray variance σ of target area and background area
2(t):
σ
2(t)＝θ
1(μ
1-μ)
2+θ
2(μ
2-μ)
2；
Work as σ
2when () obtains maximal value t, choose now corresponding described grey parameter T as final gray threshold.
If f (x, y) is for image after gray processing is at the gamma function of XY coordinate system, extract threshold value T in conjunction with maximum variance between clusters, by the background of image and Object Segmentation, the image g (x, y) after segmentation meets:
When f (x, y) is lower than threshold value T, then this place is assigned black, and when f (x, y) is higher than threshold value T, this place is white by amplitude;
Pass through limb recognition, find out and travel through all connected domains, obtain the pixel quantity of each connected domain, and remove the few connected domain of pixel by the empirical value of setting, noise is got rid of, and the pixel quantity of all target connected domains is added, obtain corresponding area according to conversion ratio, be insulator surface RTV defect area;
Wherein, convert ratio to ask for process as follows:
Gaussian imaging equation basic in optics is:
f is focal length, and u is object distance, and v is image distance.Be v/u according to image objects size and full scale ratio, the conversion ratio that can obtain the corresponding size in kind of pixel area of single pixel is (u/v)
2=[(u ?f)/f]
2.In reality, object distance and focal length are known, therefore ask for the complete formula of RTV defect area by the number of pixel as follows:
Further, the present invention, according to storage insulator upper surface inner and outer diameter and angle of inclination, determines the area that the complete RTV of upper surface should cover, obtains by following formula the number percent that defect part occupies surface area:
Thus the degree of aging of RTV on insulator can be judged according to this number percent, determine whether change insulator.
Composition graphs 2, Fig. 3, the RTV coating damage area detecting device based on image recognition of the present invention, comprising:
For removing the cleaning plant of pollution severity of insulators;
For dipping colored liquid and the application device of uniform application insulator surface RTV defect part;
The blank ring-shaped rice paper of colored liquid trace is obtained for being enclosed within insulator surface;
For gathering the image collecting device of rice paper image; And
For calculating colored liquid areal of indentation size and determining the computing machine of RTV coating damage area.
Further, described cleaning plant is hairbrush, and described application device is writing brush.
Described colored liquid is prepared Chinese ink, and the amount of prepared Chinese ink just makes writing brush complete wetting not drip again, retouches black fractional wettability but the prepared Chinese ink not going out ready-made stock or become to drip.
The ring-shaped rice paper opening up colored liquid trace is placed on a circular platform, and image collecting device, just to Platform center, is fixed with the distance of rice paper and camera lens and rice paper keeping parallelism.
The present invention fast and accurately can calculate the defect area of insulator surface RTV coating, and calculate the number percent that damaged area occupies total surface area, the degree of insulator surface coating aging and the degree of Flashover Characteristics decline can be assessed, for on-the-spot insulator O&M provides Technical Reference according to this number percent.
Claims (10)
1. an insulator RTV coating damage area detecting method, is characterized in that, comprise the following steps:
Step 1, removal pollution severity of insulators;
Step 2, employing colored liquid smear insulator surface RTV defect;
Step 3, smeared all defect after, the annular rice paper of blank is put insulator surface;
Step 4, the ring-shaped rice paper opening up upper colored liquid trace is shakeout after be placed on platform, by image acquisition device rice paper image, and the image collected is sent to computing machine;
Step 5, computing machine carry out contours extract and Region dividing to the colored liquid trace on rice paper, identify colored liquid trace region, define look liquid trace region area, i.e. the area of insulator upper surface RTV coating damage by calculating pixel quantity.
2. insulator RTV coating damage area detecting method according to claim 1, is characterized in that, step 1, especially by the light brush insulator surface of hairbrush, removes pollution severity of insulators.
3. insulator RTV coating damage area detecting method according to claim 1 and 2, it is characterized in that, step 2 colored liquid adopts prepared Chinese ink, especially by the writing brush dipping prepared Chinese ink, the place of insulator surface RTV defect is retouched black, the amount of prepared Chinese ink just makes writing brush complete wetting not drip again, retouch black fractional wettability but the prepared Chinese ink not going out ready-made stock or become to drip, retouch in black process and keep writing brush to soak always.
4. insulator RTV coating damage area detecting method according to claim 3, is characterized in that, use sponge to pat rice paper in step 3, the prepared Chinese ink of defect is opened up on rice paper completely, and don't occur the state that prepared Chinese ink scatters.
5. insulator RTV coating damage area detecting method according to claim 1, it is characterized in that, in step 4, image collecting device is fixedly installed on directly over ring-shaped rice paper by brandreth, and camera lens and rice paper keeping parallelism.
6. insulator RTV coating damage area detecting method according to claim 1, it is characterized in that, the detailed process in step 5 is:
Step 5 ?1, according to gather image obtain grey level histogram, by maximum variance between clusters determination gray threshold T, if f (x, y) for image after gray processing is at the gamma function of XY coordinate system, by the background of image and Object Segmentation, the image g (x, y) after segmentation meets:
When f (x, y) is lower than threshold value T, then this place is assigned black, and when f (x, y) is higher than threshold value T, this place is white by amplitude;
Step 5 ?2, pass through limb recognition, find out and travel through all connected domains, obtain the pixel quantity of each connected domain, and remove the few connected domain of pixel by the empirical value of setting, noise is got rid of, and the pixel quantity of all target connected domains is added, determine insulator surface RTV defect area.
7. an insulator RTV coating damage area detecting device, is characterized in that, comprising:
For removing the cleaning plant of pollution severity of insulators;
For dipping colored liquid and the application device of uniform application insulator surface RTV defect part;
The blank ring-shaped rice paper of colored liquid trace is obtained for being enclosed within insulator surface;
For gathering the image collecting device of rice paper image.And
For calculating colored liquid areal of indentation size and determining the computing machine of RTV coating damage area.
8. insulator RTV coating damage area detecting device according to claim 7, it is characterized in that, described cleaning plant is hairbrush, and described application device is writing brush.
9. insulator RTV coating damage area detecting device according to claim 8, it is characterized in that, described colored liquid is prepared Chinese ink, and the amount of prepared Chinese ink just makes writing brush complete wetting not drip again, retouches black fractional wettability but the prepared Chinese ink not going out ready-made stock or become to drip.
10. insulator RTV coating damage area detecting device according to claim 7, it is characterized in that, the ring-shaped rice paper opening up colored liquid trace is placed on a circular platform, and image collecting device, just to Platform center, is fixed with the distance of rice paper and camera lens and rice paper keeping parallelism.
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| CN106443393A (en) * | 2016-11-17 | 2017-02-22 | 武汉大学 | Pollution flashover testing method of insulator simulated RTV (room temperature vulcanization) coating dropping |
| CN107192714A (en) * | 2017-06-01 | 2017-09-22 | 首钢总公司 | A kind of method and system for measuring Submerged Nozzle Clogging Course degree |
| CN107576594A (en) * | 2017-09-05 | 2018-01-12 | 国网河南省电力公司检修公司 | A kind of antifouling flush paint quality site assessment detection means |
| CN108226158A (en) * | 2017-12-27 | 2018-06-29 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of detection method for irregular masonry mortar plumpness |
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| CN111008967A (en) * | 2019-12-04 | 2020-04-14 | 华北电力大学 | Insulator RTV coating defect identification method |
| CN113028960A (en) * | 2021-03-17 | 2021-06-25 | 中国航发动力股份有限公司 | Method for measuring damage deformation of sealed labyrinth |
| CN113063793A (en) * | 2021-03-25 | 2021-07-02 | 中山大学 | Graphical processing analysis method for service condition of titanium alloy surface coating and application thereof |
| CN113532337A (en) * | 2021-06-25 | 2021-10-22 | 中国航发沈阳发动机研究所 | Method for determining sealing clearance of comb tooth honeycomb structure in working state |
| CN116612098A (en) * | 2023-05-29 | 2023-08-18 | 国网陕西省电力有限公司电力科学研究院 | Insulator RTV spraying quality evaluation method and device based on image processing |
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| CN106443393A (en) * | 2016-11-17 | 2017-02-22 | 武汉大学 | Pollution flashover testing method of insulator simulated RTV (room temperature vulcanization) coating dropping |
| CN107192714A (en) * | 2017-06-01 | 2017-09-22 | 首钢总公司 | A kind of method and system for measuring Submerged Nozzle Clogging Course degree |
| CN107192714B (en) * | 2017-06-01 | 2020-03-27 | 首钢集团有限公司 | Method and system for measuring blockage degree of submerged nozzle |
| CN107576594A (en) * | 2017-09-05 | 2018-01-12 | 国网河南省电力公司检修公司 | A kind of antifouling flush paint quality site assessment detection means |
| CN108226158A (en) * | 2017-12-27 | 2018-06-29 | 中国电建集团贵阳勘测设计研究院有限公司 | A kind of detection method for irregular masonry mortar plumpness |
| CN108734709B (en) * | 2018-05-29 | 2022-03-25 | 西安工程大学 | Insulator flange shape parameter identification and damage detection method |
| CN108734709A (en) * | 2018-05-29 | 2018-11-02 | 西安工程大学 | A kind of identification of insulator flange shape parameter and destructive test method |
| CN110332909A (en) * | 2019-07-09 | 2019-10-15 | 河海大学 | Portable leaf area instrument |
| CN111008967A (en) * | 2019-12-04 | 2020-04-14 | 华北电力大学 | Insulator RTV coating defect identification method |
| CN113028960A (en) * | 2021-03-17 | 2021-06-25 | 中国航发动力股份有限公司 | Method for measuring damage deformation of sealed labyrinth |
| CN113063793A (en) * | 2021-03-25 | 2021-07-02 | 中山大学 | Graphical processing analysis method for service condition of titanium alloy surface coating and application thereof |
| CN113532337A (en) * | 2021-06-25 | 2021-10-22 | 中国航发沈阳发动机研究所 | Method for determining sealing clearance of comb tooth honeycomb structure in working state |
| CN116679171A (en) * | 2023-05-15 | 2023-09-01 | 江苏云峰科技股份有限公司 | Insulation state judging system of insulation piece of wind power generation switch |
| CN116679171B (en) * | 2023-05-15 | 2023-11-10 | 江苏云峰科技股份有限公司 | Insulation state judging system of insulation piece of wind power generation switch |
| CN116612098A (en) * | 2023-05-29 | 2023-08-18 | 国网陕西省电力有限公司电力科学研究院 | Insulator RTV spraying quality evaluation method and device based on image processing |
| CN116612098B (en) * | 2023-05-29 | 2024-04-02 | 国网陕西省电力有限公司电力科学研究院 | Insulator RTV spraying quality evaluation method and device based on image processing |
| CN117347374A (en) * | 2023-12-05 | 2024-01-05 | 山东扬智汽车科技有限公司 | Multi-station automobile part test bench |
| CN117347374B (en) * | 2023-12-05 | 2024-02-20 | 山东扬智汽车科技有限公司 | Multi-station automobile part test bench |
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Application publication date: 20160203 |