CN103604755A - Method for detecting ageing of umbrella skirt of silicon rubber composite insulator - Google Patents
Method for detecting ageing of umbrella skirt of silicon rubber composite insulator Download PDFInfo
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- CN103604755A CN103604755A CN201310608011.3A CN201310608011A CN103604755A CN 103604755 A CN103604755 A CN 103604755A CN 201310608011 A CN201310608011 A CN 201310608011A CN 103604755 A CN103604755 A CN 103604755A
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Abstract
The invention discloses a method for detecting ageing of an umbrella skirt of a silicon rubber composite insulator. The method comprises the following steps: a, capturing an image of an outer surface of the umbrella skirt of the silicon rubber composite insulator and an image of an inner surface after the umbrella skirt is cut apart; b, processing the images to obtain color vectors of the outer surface and the inner surface of the umbrella skirt, figuring out a chromatic aberration of the color vectors according to the color vectors of the outer surface and the inner surface of the umbrella skirt; and c, comparing the chromatic aberration figured out in the step b with a preset chromatic aberration threshold, judging whether the figured chromatic aberration is more than the preset chromatic aberration threshold, if yes, judging that the umbrella skirt is aged, and otherwise, judging that the umbrella is not aged. The invention provides a method for detecting the ageing of the umbrella skirt of the silicon rubber composite insulator, which is simple, accurate and efficient.
Description
Technical field
The present invention relates to a kind of silicon rubber compound insulator aging degree of umbrella skirt detection method.
Background technology
Silastic material is insulating material conventional in electric system, is widely used in composite insulator, antifouling flush paint, cable termination annex etc.But silicon rubber is a kind of high-molecular organic material, long-term, be in servicely easily subject to the effect of the factors such as electric field, illumination, humidity and occur aging.Once catabiosis occurs composite insulator umbrella skirt, the electric property of insulating device, mechanical property all can significantly decline, and then have influence on the normal operation of electrical network.Therefore, detect silastic material composite insulator umbrella skirt aging degree, can help operations staff to find in time aging insulating element, thereby can it be changed timely or be repaired.The main manifestations that silastic material occurs after aging comprises: efflorescence, surface occur that crackle, hydrophobic nature decline, hardness rises, easily tear and fracture and a series of micro-property variation etc., yet, as simple mode how accurately and in time detects the whether aging and degree of aging of silicon rubber insulation material, remain problem demanding prompt solution.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of simply, silicon rubber compound insulator aging degree of umbrella skirt detection method accurately and efficiently.
For achieving the above object, the present invention is by the following technical solutions:
A silicon rubber compound insulator aging degree of umbrella skirt detection method, is characterized in that, comprises the following steps:
A. the image and the full skirt that absorb silicon rubber compound insulator full skirt outside surface cut the image on rear inner surface;
B. process described image to obtain the color vector on full skirt outside surface and inner surface, and according to the color vector on full skirt outside surface and inner surface, calculate both aberration;
C. aberration step b being calculated and default color difference threshold compare, and whether the aberration that judgement calculates is greater than default color difference threshold, if be greater than, and judgement aging degree of umbrella skirt, otherwise judgement full skirt is unaged.
Preferably:
The image of described full skirt outside surface comprises the image of full skirt upper surface and the image of full skirt lower surface, in step b, obtain the color vector on the upper and lower surface of full skirt and calculate respectively upper and lower surface and inner surperficial aberration, in step c, be that larger aberration and default color difference threshold are compared.
In step b, calculate the difference vector of color vector with the color vector on inner surface on the upper and lower surface of full skirt, obtain the mould of difference vector of upper surface, lower surface and the mould of the color vector on inner surface, calculate the chromatic aberration coefficient on upper and lower surface.
Described image absorbs under white background thing.
Described white background thing is blank sheet of paper.
In step b, obtain full skirt upper surface, inner surface, lower surface and white background thing color vector [R, G, B] separately
twhether judge in the R/G/B numerical value of white background thing has numerical value to depart from preset range, if any corresponding numerical value in the R/G/B of white background objects being carried out to proportional zoom, make it get back to preset range, corresponding numerical value in the R/G/B of the color vector of full skirt upper surface, inner surface, lower surface is also carried out to convergent-divergent in proportion simultaneously, the color vector after convergent-divergent is used for calculating aberration.
The RGB preset range of white background thing is [210 ± 5,210 ± 5,210 ± 5]
t.
The color vector [R, G, B] that full skirt upper surface, inner surface, lower surface and white background thing are respectively got to a plurality of points
t, conduct color vector separately after averaging, preferably, the color vector of described a plurality of points is color vector of 3～5 points.
Described default color difference threshold is 0.25.
A silicon rubber compound insulator aging degree of umbrella skirt detection method, is characterized in that, comprises the following steps:
A. the image and the full skirt that absorb silicon rubber compound insulator full skirt outside surface cut the image on rear inner surface;
B. process described image to obtain the color vector on full skirt outside surface and inner surface, and according to the color vector on full skirt outside surface and inner surface, calculate both aberration;
C. according to default value of chromatism and aging degree of umbrella skirt degree corresponding relation, determine the corresponding aging degree of umbrella skirt degree of described aberration.
Useful technique effect of the present invention:
The present invention proposes the silicon rubber compound insulator aging degree of umbrella skirt detection method of analyzing based on change color, the intensity of variation of color after changing according to silastic material performance, silastic material apparent property is carried out to quantitative test, can realize simply, quickly and accurately the detection to insulator umbrella degree of aging.Owing to utilizing a small amount of sample quantitatively to judge its degree of aging, and measuring method is simple and easy to do, and accuracy is higher.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of a kind of embodiment of degree of aging detection method of the present invention;
Fig. 2 is the process flow diagram of the another kind of embodiment of degree of aging detection method of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated.Should be emphasized that, following explanation is only exemplary, rather than in order to limit the scope of the invention and to apply.
Consult Fig. 1, a kind of degree of aging detection method for silicon rubber compound insulator full skirt, comprises the following steps:
The image on inner surface after the image of picked-up silicon rubber compound insulator full skirt outside surface and full skirt cut;
Process described image to obtain the color vector on full skirt outside surface and inner surface, and according to the color vector on full skirt outside surface and inner surface, calculate both aberration;
The aberration calculating and default color difference threshold are compared, and whether the aberration that judgement calculates is greater than default color difference threshold, if be greater than, and judgement aging degree of umbrella skirt, otherwise judgement full skirt is unaged.
Detecting the measuring equipment using can comprise: the digital camera of every acquisition parameters can be set, and for the treatment of the computing machine with analysis of image data, its software that can move reading images parameter is as Photoshop or Matlab etc.
To the degree of aging analysis of silastic material, mainly by material surface color (after filth is removed) is carried out with the difference of internal color, the degree of aging of the larger illustrative material of difference is more serious.
Concerning composite insulator umbrella skirt material, need to compare its top layer and inner color distortion.
First, the shooting under the same terms is carried out in the top layer of silastic material and inside, to taking the photo of gained, carry out image processing, read the color vector of top layer, internal material, then by the mould to vectorial, calculate quantitative chromatic aberration.
Redness for the color vector of silastic material, green, blue trichromatic specification, forms tri-vector.The computing formula of aberration is:
Wherein || || in be vectorial mould, its computing formula is
Specifically, can cut from composite insulator umbrella skirt edge the full skirt sample that two block sizes are close, big or small about 3cm * 3cm, the upper surface that comprises full skirt and lower surface.Cut a banded sample, big or small about 3cm * 1cm, should make the inside of full skirt expose again.
White background as blank sheet of paper on, the image of picked-up full skirt upper surface, inside, lower surface.
To the processing of image, can use Matlab or Photoshop software, utilize software to read respectively the color vector [R, G, B] of full skirt upper surface, inside, lower surface
t, and the color vector of blank sheet of paper [R, G, B]
t.To each part, can get the color vector of 3～5 points, after averaging as final color vector.
The major advantage of blank sheet of paper is to the shooting condition of camera, to demarcate preferably, should use same a blank sheet of paper, with the accuracy that guarantees to demarcate when each shooting.
Preferably, the default measurement result of RGB that blank sheet of paper is measured is made as [210 ± 5,210 ± 5,210 ± 5]
tif the color vector that has numerical value to depart from this range specification full skirt upper surface, inside, lower surface in blank sheet of paper R/G/B numerical value also exists and departs from, can adjust with reference to the default measurement result of blank sheet of paper.Now the analog value obtaining is carried out to proportional zoom, make it drop into preset range, corresponding numerical value in the R/G/B of the color vector of full skirt upper surface, inner surface, lower surface is also carried out to convergent-divergent in proportion simultaneously, the color vector after convergent-divergent is used for calculating aberration.
In one example, after selected suitable photographical condition, sample is taken pictures, then use Matlab or Photoshop software to read the color vector of sample, the color vector that obtains upper surface, inside, lower surface is respectively [185.7,143,129.3]
t, [150.3,79,53.7]
t[187,141,127]
t.It is poor that the color vector on upper and lower surface and internal color vector are done respectively, and the difference vector that obtains result upper surface, lower surface is respectively [35.4,64,75.6]
t[36.7,62,73.3]
t.The mould that obtains thus upper surface, lower surface difference vector is respectively 105.2 and 102.8, and the mould of inner layer color vector is 178.1.The chromatic aberration coefficient that finally obtains upper and lower surface is respectively 0.591 and 0.577.
Chromatic aberration coefficient and setting threshold 0.25 are compared, if upper and lower surface has any one chromatic aberration coefficient to reach more than 0.25, can illustrate that comparatively significantly changing has appearred in full skirt surface, runnability probably has decline, need to change.
As shown in Figure 2, in another kind of embodiment, can also be according to detected aberration and default value of chromatism and aging degree of umbrella skirt degree corresponding relation, judgement aging degree of umbrella skirt degree, repeats no more.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a silicon rubber compound insulator aging degree of umbrella skirt detection method, is characterized in that, comprises the following steps:
A. the image and the full skirt that absorb silicon rubber compound insulator full skirt outside surface cut the image on rear inner surface;
B. process described image to obtain the color vector on full skirt outside surface and inner surface, and according to the color vector on full skirt outside surface and inner surface, calculate both aberration;
C. aberration step b being calculated and default color difference threshold compare, and whether the aberration that judgement calculates is greater than default color difference threshold, if be greater than, and judgement aging degree of umbrella skirt, otherwise judgement full skirt is unaged.
2. detection method as claimed in claim 1, it is characterized in that, the image of described full skirt outside surface comprises the image of full skirt upper surface and the image of full skirt lower surface, in step b, obtain the color vector on the upper and lower surface of full skirt and calculate respectively upper and lower surface and inner surperficial aberration, in step c, be that larger aberration and default color difference threshold are compared.
3. detection method as claimed in claim 2, it is characterized in that, in step b, calculate the difference vector of color vector with the color vector on inner surface on the upper and lower surface of full skirt, obtain the mould of difference vector of upper surface, lower surface and the mould of the color vector on inner surface, calculate the chromatic aberration coefficient on upper and lower surface.
4. detection method as claimed in claim 1, is characterized in that, described image absorbs under white background thing.
5. detection method as claimed in claim 4, is characterized in that, described white background thing is blank sheet of paper.
6. detection method as claimed in claim 4, is characterized in that, in step b, obtains full skirt upper surface, inner surface, lower surface and white background thing color vector [R, G, B] separately
twhether judge in the R/G/B numerical value of white background thing has numerical value to depart from preset range, if any corresponding numerical value in the R/G/B of white background objects being carried out to proportional zoom, make it drop into preset range, corresponding numerical value in the R/G/B of the color vector of full skirt upper surface, inner surface, lower surface is also carried out to convergent-divergent in proportion simultaneously, the color vector after convergent-divergent is used for calculating aberration.
7. detection method as claimed in claim 6, is characterized in that, the RGB preset range of white background thing is [210 ± 5,210 ± 5,210 ± 5]
t.
8. detection method as claimed in claim 6, is characterized in that, the color vector [R, G, B] that full skirt upper surface, inner surface, lower surface and white background thing are respectively got to a plurality of points
t, conduct color vector separately after averaging, preferably, the color vector of described a plurality of points is color vector of 3～5 points.
9. the detection method as described in claim 1 to 8 any one, is characterized in that, described default color difference threshold is 0.25.
10. a silicon rubber compound insulator aging degree of umbrella skirt detection method, is characterized in that, comprises the following steps:
A. the image and the full skirt that absorb silicon rubber compound insulator full skirt outside surface cut the image on rear inner surface;
B. process described image to obtain the color vector on full skirt outside surface and inner surface, and according to the color vector on full skirt outside surface and inner surface, calculate both aberration;
C. according to default value of chromatism and aging degree of umbrella skirt degree corresponding relation, determine the corresponding aging degree of umbrella skirt degree of described aberration.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089894A (en) * | 2014-07-07 | 2014-10-08 | 国家电网公司 | Method for determining service life of composite insulator based on color difference |
| CN108872059A (en) * | 2018-09-10 | 2018-11-23 | 国网河北省电力有限公司电力科学研究院 | Composite insulator ageing state appraisal procedure and terminal device |
| CN114236321A (en) * | 2021-11-11 | 2022-03-25 | 国网内蒙古东部电力有限公司电力科学研究院 | Method for evaluating aging state of casing surface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089894A (en) * | 2014-07-07 | 2014-10-08 | 国家电网公司 | Method for determining service life of composite insulator based on color difference |
| CN108872059A (en) * | 2018-09-10 | 2018-11-23 | 国网河北省电力有限公司电力科学研究院 | Composite insulator ageing state appraisal procedure and terminal device |
| CN108872059B (en) * | 2018-09-10 | 2020-10-09 | 国网河北省电力有限公司电力科学研究院 | Composite insulator aging state assessment method and terminal equipment |
| CN114236321A (en) * | 2021-11-11 | 2022-03-25 | 国网内蒙古东部电力有限公司电力科学研究院 | Method for evaluating aging state of casing surface |
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