CN114236321A - Method for evaluating aging state of casing surface - Google Patents
Method for evaluating aging state of casing surface Download PDFInfo
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- CN114236321A CN114236321A CN202111338547.9A CN202111338547A CN114236321A CN 114236321 A CN114236321 A CN 114236321A CN 202111338547 A CN202111338547 A CN 202111338547A CN 114236321 A CN114236321 A CN 114236321A
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- sample
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- color difference
- sleeve
- aging
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- 230000032683 aging Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 9
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 16
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 claims abstract description 14
- 238000011156 evaluation Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000011109 contamination Methods 0.000 claims description 2
- 239000008367 deionised water Substances 0.000 claims description 2
- 229910021641 deionized water Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000003921 oil Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000004445 quantitative analysis Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000004945 silicone rubber Substances 0.000 description 5
- 239000012212 insulator Substances 0.000 description 3
- 239000011810 insulating material Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000004643 material aging Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for evaluating the surface aging state of a sleeve, which comprises the following steps: step 1: cutting a sample from a sleeve made of silicon rubber; step 2: respectively measuring the inner surface and the outer surface of the sample by using a color difference meter, wherein the color difference meter obtains the brightness difference, the red-green difference and the yellow-blue difference between the inner surface of the sample and the inner surface of the standard sample, and the color difference meter obtains the brightness difference, the red-green difference and the yellow-blue difference between the outer surface of the sample and the outer surface of the standard sample; and step 3: calculating the color difference value delta E between the inner surface and the outer surface of the sample; and 4, step 4: and comparing the color difference value delta E between the inner surface and the outer surface of the sample with a preset color difference threshold, and judging the aging of the sleeve if the delta E is larger than the preset color difference threshold. The invention mainly uses the color difference value to represent the change degree of the color according to the change of the performance of the silicon rubber material after aging, and further carries out quantitative analysis on the performance and the aging degree of the silicon rubber sleeve, thereby accurately realizing the detection of the aging state of the surface of the sleeve.
Description
Technical Field
The invention relates to the technical field of insulator aging evaluation, in particular to a method for evaluating the aging state of the surface of a sleeve.
Background
The insulating sleeve is an insulator used for penetrating a live conductor, is used as an important insulating material, is mainly built in power equipment such as a transformer, a reactor, a breaker and the like and a wall body, plays a role in insulating against the ground, supporting and carrying current, and is very wide in application.
The silicon rubber insulating material has good electrical insulating property, weather resistance and explosion resistance, and is widely applied to electric power equipment such as sleeves, insulators, climbing umbrella skirts and the like. Among them, the silicone rubber sleeve is favored for its advantages of high mechanical strength, strong stain resistance, light weight, small volume, and being not easy to break. However, the silicone rubber sleeve is subjected to comprehensive effects of electrical and mechanical factors and environmental factors such as ultraviolet rays, dirt, high temperature and the like in the using process, and the problem of insulation material aging can occur along with the increase of time, so that the performance of the silicone rubber sleeve is linearly reduced, equipment is failed, and even the production safety is threatened. Therefore, the aging degree of the silicone rubber sleeve material is detected, so that equipment operators can find the aged sleeve in time, and the aged sleeve can be repaired and replaced in time. However, at present, a lot of manufacturers for producing silicone rubber sleeves in China exist, the types of sleeve products are complicated, and it is undoubtedly impractical to invent a corresponding aging evaluation method for each product, so that it is very important to develop a general sleeve aging state evaluation method.
Disclosure of Invention
The invention aims to provide an accurate, simple, efficient and universal method for evaluating the surface aging state of a sleeve.
In order to achieve the purpose, the invention provides a method for evaluating the surface aging state of a sleeve, which comprises the following steps:
step 1: cutting a sample from a sleeve made of silicon rubber, wherein the sample comprises the outer surface of the sleeve and the inner surface of the sleeve;
step 2: respectively measuring the inner surface and the outer surface of the sample by using a color difference meter, wherein the color difference meter obtains a brightness difference L, a red-green difference a and a yellow-blue difference b between the inner surface of the sample and the inner surface of the standard sample, and the color difference meter obtains a brightness difference L1, a red-green difference a1 and a yellow-blue difference b1 between the outer surface of the sample and the outer surface of the standard sample;
and step 3: calculating the difference between the internal and external surface color values of the sample Δ E according to the following formula;
ΔE*＝[(ΔL*)2+(Δa*)2+(Δb*)2]1/2
wherein, Δ L ═ L1-L, Δ a ═ a1-a, Δ b ═ b 1-b;
and 4, step 4: and comparing the color difference value delta E between the inner surface and the outer surface of the sample with a preset color difference threshold, and judging the aging of the sleeve if the delta E is larger than the preset color difference threshold.
The invention has the beneficial effects that:
the invention mainly uses the color difference value to represent the change degree of the color according to the change of the performance of the silicon rubber material after aging, and further carries out quantitative analysis on the performance and the aging degree of the silicon rubber sleeve, thereby accurately and rapidly realizing the detection and the evaluation of the aging state of the surface of the sleeve. Meanwhile, the method adopts a color difference meter to measure the color difference value of the inner layer and the outer layer of the sleeve sample, and uses the color difference value of the inner layer and the outer layer to represent the surface aging state of the sleeve (surface aging is essentially the change of the molecular state of surface materials, the color and the glossiness can be influenced in appearance, and the two indexes are integrated to form the chromaticity), so that the aging evaluation can be carried out on the sleeves of different batches and different formulas, and the method has universality.
Detailed Description
The present invention is further illustrated in detail by the following specific examples:
a casing surface aging state evaluation method comprises the following steps:
step 1: cutting a test sample (the size of the test sample is 5-10 mm in length and width, and 5-6 mm in thickness) from a sleeve made of silicon rubber by using a surgical scalpel, wherein the test sample comprises the outer surface of the sleeve and the inner surface of the sleeve, the inner layer of the sample is slightly influenced by external factors, the inner layer of the sample can be considered to be almost not aged, the default condition is a factory-leaving state, and the outer layer of the sample corresponds to the aging under the actual condition;
step 2: respectively measuring the inner surface and the outer surface of a sample by using a color difference meter (NH310 color difference meter), wherein the color difference meter obtains a brightness difference L, a red-green difference a and a yellow-blue difference b between the inner surface of the sample and the inner surface of a standard sample, and the color difference meter obtains a brightness difference L1, a red-green difference a1 and a yellow-blue difference b1 between the outer surface of the sample and the outer surface of the standard sample, (the brightness axis represents black and white, 0 is black, 100 is white, the positive value of the red-green axis is red, the negative value is green, 0 is neutral, the positive value of the yellow-blue axis is yellow, the negative value is blue, and 0 is neutral);
and step 3: calculating the difference between the internal and external surface color values of the sample Δ E according to the following formula;
ΔE*＝[(ΔL*)2+(Δa*)2+(Δb*)2]1/2
wherein, Δ L ═ L1-L, Δ a ═ a1-a, Δ b ═ b 1-b;
and 4, step 4: comparing the color difference value delta E between the inner surface and the outer surface of the sample with a preset color difference threshold, if delta E is larger than the preset color difference threshold, judging that the sleeve is aged, otherwise, judging that the sleeve is not aged, wherein in the embodiment, the preset color difference threshold is 5.
In step 1 of the technical scheme, the sample is cleaned and dried by clean water, then the oil contamination impurities of the sample are cleaned by absolute ethyl alcohol, and finally the aged sample is washed by deionized water and dried.
In step 4 of the above technical scheme, the larger the difference between Δ E and the preset color difference threshold value is, the more serious the sample is aged.
In the technical scheme, the color difference meter measures the brightness difference L, the red-green difference a and the yellow-blue difference b between the inner surface of the sample and the inner surface of the standard sample, and the brightness difference L1, the red-green difference a1 and the yellow-blue difference b1 between the outer surface of the sample and the outer surface of the standard sample according to the Lab principle of the CIE chromaticity space.
The running condition shows that the characteristics of the silicon rubber sleeve such as color change, microcrack, fracture, stickiness, differentiation and the like can appear along with the increase of the aging degree, wherein the aging and color change of the silicon rubber are more visual, the color change is in the early and middle stages of aging, and the evaluation on the color change is more reliable and safer, so the aging detection is carried out according to the change of the color difference value of the aged rubber.
In the embodiment, a plurality of samples are collected, each sample is sampled at multiple points, the color difference value of the inner layer and the outer layer of the sleeve sample is measured by a color difference meter, and the result is as follows:
the inside of the sleeve sample, as it was not directly exposed to the outside environment, can be considered to be in factory mode, i.e. the surface was not aged. As can be seen from the measurement results in the table above, there is a certain difference in the color difference of the inner layer, which has a direct relationship with the production process, production formula and the like of the casing. In order to eliminate the influence caused by different batches of the sleeve and different production processes and production formulas, the aging degree sequence of the outer layer of the sleeve sample is characterized by adopting the color difference values of the inner layer and the outer layer of the sleeve sample as follows: #3 > #1 > #2 > #5 > #6 > # 4. And finally, comparing the value with a preset color difference value threshold value 5, if the value is larger than the preset color difference value threshold value, judging that the sleeve is aged, wherein the larger the color difference value is, the more serious the aging is. The final outer layer aging degree is ordered as: #3 > #1 > #2 > #5 > # 6.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (4)
1. A casing surface aging state evaluation method is characterized by comprising the following steps:
step 1: cutting a sample from a sleeve made of silicon rubber, wherein the sample comprises the outer surface of the sleeve and the inner surface of the sleeve;
step 2: respectively measuring the inner surface and the outer surface of the sample by using a color difference meter, wherein the color difference meter obtains a brightness difference L, a red-green difference a and a yellow-blue difference b between the inner surface of the sample and the inner surface of the standard sample, and the color difference meter obtains a brightness difference L1, a red-green difference a1 and a yellow-blue difference b1 between the outer surface of the sample and the outer surface of the standard sample;
and step 3: calculating the difference between the internal and external surface color values of the sample Δ E according to the following formula;
ΔE*＝[(ΔL*)2+(Δa*)2+(Δb*)2]1/2
wherein, Δ L ═ L1-L, Δ a ═ a1-a, Δ b ═ b 1-b;
and 4, step 4: and comparing the color difference value delta E between the inner surface and the outer surface of the sample with a preset color difference threshold, and judging the aging of the sleeve if the delta E is larger than the preset color difference threshold.
2. The casing surface aging state evaluation method according to claim 1, characterized in that: in the step 1, the sample is further cleaned and dried by using clean water, then the oil contamination impurities of the sample are cleaned by using absolute ethyl alcohol, and finally the sample is washed by using deionized water and dried.
3. The casing surface aging state evaluation method according to claim 1, characterized in that: in the step 4, the larger the difference between the delta E and the preset color difference threshold value is, the more serious the sample is aged.
4. The casing surface aging state evaluation method according to claim 1, characterized in that: the color difference meter measures the brightness difference L, the red-green difference a and the yellow-blue difference b between the inner surface of the sample and the inner surface of the standard sample, and the brightness difference L1, the red-green difference a1 and the yellow-blue difference b1 between the outer surface of the sample and the outer surface of the standard sample according to the Lab principle of CIE chromaticity space.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111338547.9A CN114236321A (en) | 2021-11-11 | 2021-11-11 | Method for evaluating aging state of casing surface |
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| CN202111338547.9A CN114236321A (en) | 2021-11-11 | 2021-11-11 | Method for evaluating aging state of casing surface |
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| CN114236321A true CN114236321A (en) | 2022-03-25 |
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| CN202111338547.9A Pending CN114236321A (en) | 2021-11-11 | 2021-11-11 | Method for evaluating aging state of casing surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114720361A (en) * | 2022-03-29 | 2022-07-08 | 江苏博汇纸业有限公司 | Paper pattern aging test method suitable for white cardboard |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08193961A (en) * | 1994-10-13 | 1996-07-30 | Shimomura Komuten:Kk | Method for measuring stain of floor surface and the like |
| 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 |
| 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 |
| CN105548000A (en) * | 2015-12-31 | 2016-05-04 | 首都博物馆 | Method for testing friction-resistant color fastness of pigment for calligraphy and painting |
| CN108267411A (en) * | 2018-04-23 | 2018-07-10 | 广东电网有限责任公司 | A kind of silicon rubber degree of aging determination method based on ectonexine color difference analysis |
| CN110095673A (en) * | 2019-06-06 | 2019-08-06 | 广东电网有限责任公司 | A kind of composite insulator umbrella skirt aging method of discrimination based on color difference clustering |
-
2021
- 2021-11-11 CN CN202111338547.9A patent/CN114236321A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08193961A (en) * | 1994-10-13 | 1996-07-30 | Shimomura Komuten:Kk | Method for measuring stain of floor surface and the like |
| 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 |
| 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 |
| CN105548000A (en) * | 2015-12-31 | 2016-05-04 | 首都博物馆 | Method for testing friction-resistant color fastness of pigment for calligraphy and painting |
| CN108267411A (en) * | 2018-04-23 | 2018-07-10 | 广东电网有限责任公司 | A kind of silicon rubber degree of aging determination method based on ectonexine color difference analysis |
| CN110095673A (en) * | 2019-06-06 | 2019-08-06 | 广东电网有限责任公司 | A kind of composite insulator umbrella skirt aging method of discrimination based on color difference clustering |
Non-Patent Citations (1)
| Title |
|---|
| 成立;梅红伟;王黎明;张福增;董弘川;: "复合绝缘子用硅橡胶护套长时间老化特性及其影响因素", 电网技术, vol. 40, no. 06, pages 1896 - 1902 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114720361A (en) * | 2022-03-29 | 2022-07-08 | 江苏博汇纸业有限公司 | Paper pattern aging test method suitable for white cardboard |
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Application publication date: 20220325 |