WO2015081607A1 - 涂有rtv防污闪涂料的绝缘子重新涂覆rtv防污闪涂料的方法 - Google Patents

涂有rtv防污闪涂料的绝缘子重新涂覆rtv防污闪涂料的方法 Download PDF

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Publication number
WO2015081607A1
WO2015081607A1 PCT/CN2014/001042 CN2014001042W WO2015081607A1 WO 2015081607 A1 WO2015081607 A1 WO 2015081607A1 CN 2014001042 W CN2014001042 W CN 2014001042W WO 2015081607 A1 WO2015081607 A1 WO 2015081607A1
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WIPO (PCT)
Prior art keywords
insulator
coating
rtv anti
color
insulator body
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PCT/CN2014/001042
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English (en)
French (fr)
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张学东
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国网山西省电力公司晋中供电公司
清华大学深圳研究生院
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Application filed by 国网山西省电力公司晋中供电公司, 清华大学深圳研究生院 filed Critical 国网山西省电力公司晋中供电公司
Publication of WO2015081607A1 publication Critical patent/WO2015081607A1/zh
Priority to US15/170,498 priority Critical patent/US9875829B2/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B19/00—Apparatus or processes specially adapted for manufacturing insulators or insulating bodies
    • H01B19/04—Treating the surfaces, e.g. applying coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/005—Repairing damaged coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/08—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an anti-friction or anti-adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
    • B08B1/143—Wipes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N19/00—Investigating materials by mechanical methods
    • G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2201/00—Polymeric substrate or laminate

Definitions

  • the present invention relates to the treatment of insulators in power systems, and more particularly to a method of recoating RTV anti-smudge flash coatings with an insulator coated with an RTV anti-fouling coating.
  • RTV anti-smudge flash coating room temperature vulcanized silicone rubber anti-fouling paint
  • Applying RTV anti-soil flash coating on the surface of the insulator can significantly improve the water repellency of the insulator, thereby increasing the flashover voltage and preventing pollution flashover accidents.
  • the weather resistance of RTV anti-fouling paint is poor, and it is susceptible to aging due to electric field, light, high humidity and other factors during long-term operation, which causes the surface water repellency to decrease.
  • RTV anti-fouling The surface of the flash coating will be degraded or even disappear due to excessive accumulation of contamination.
  • the general measure is to replace the insulator and apply RTV anti-fouling paint on the surface of the newly replaced insulator.
  • this treatment is costly and causes waste of the insulator.
  • the technical problem to be solved by the present invention is to make up for the deficiencies of the above prior art, and to propose a method for recoating an RTV anti-smudge flash coating with an insulator coated with an RTV anti-smudge flash coating, which can be recovered without replacing the insulator.
  • the water repellency of the surface of the insulator ensures that its anti-fouling properties do not decrease.
  • a method of recoating an RTV anti-smudge flash coating with an insulator coated with an RTV anti-smudge flash coating the insulator comprising an insulator body, a steel leg connected to an upper surface of the insulator body, and a lower surface of the insulator body
  • the connected steel cap includes the following steps:
  • the RTV anti-smudge flash coating re-coated in the steps (3.1) and (3.2) has a solid mass content of 55% to 65%, sprayed at least twice, and the coating of the newly coated RTV anti-smudge flash coating.
  • the thickness is not less than 0.2 mm.
  • the newly applied coating has a great influence on the original coating when the coating surface of the original RTV anti-smudge coating is recoated.
  • the original coating has a great effect on the newly applied coating.
  • the RTV anti-smudge flash coating re-coated by the process conditions in the above technical solution has been tested, and the water repellency can reach HC1 ⁇ HC2 level, and the adhesion level is ISO0 ⁇ ISO2 grade, total thickness. (The sum of the thickness of the new coating and the original coating) is not less than 0.35mm. At the same time, it can avoid the impact and swelling damage on the original coating during the recoating process.
  • the stain on the surface of the insulator is wiped off using a dry flannel or a non-woven fabric.
  • the water repellency is tested by a water spray classification method; the color of the coating is determined by using a color chart, and the coating defines nine colors than a color card. It is represented by the numbers 1 to 9, respectively. If the value is 1 to 5, the coating state is good, and if the value is 6 to 9, the coating state is poor; the step (2) includes the following substeps:
  • step (2.1) If the water repellency is HC1 to HC2, proceed to step (2.2), if the water repellency is HC5 to HC7, proceed to step (2.3), and if the water repellency is HC3 to HC4, proceed to step (2.4) ;
  • step (2.2) If the coating color is 1-5, the insulator does not need to be coated, if the coating color is 6-9, proceed to step (2.4);
  • step (2.3) If the coating color is 1-5, proceed to step (2.4). If the coating color is 6-9, the insulator cannot be recoated;
  • an adhesion test is performed at a position where the upper surface of the insulator body is close to the steel cap.
  • the coating is numerically represented by RGB color space than the nine colors specified in the color card, the number 1 to 9 are expressed as:
  • the numbers 1 to 9 are respectively expressed as:
  • the water spray is used to spray water, so that the water drops cover the entire surface of the insulator, and the poor part is selected for the water repellency test.
  • the invention can recoat the insulator which has been coated with the RTV anti-smudge flash coating, and after the coating is completed according to the invention, the newly coated anti-fouling paint can adhere to the surface of the insulator without swelling.
  • the adhesion between the coating and the insulator does not decrease, and the water repellency of the surface is restored, and the contamination voltage of the insulator is not reduced.
  • the invention provides a method for recoating an RTV anti-smudge flash coating with an insulator coated with an RTV anti-smudge flash coating, the insulator comprising an insulator body, a steel leg connected to an upper surface of the insulator body, and the insulator body
  • the lower surface connected steel cap in a specific embodiment, includes the following steps:
  • the RTV anti-smudge flash coating re-coated in the steps (3.1) and (3.2) has a solid mass content of 55% to 65%, sprayed at least twice, and the coating of the newly coated RTV anti-smudge flash coating.
  • the thickness is not less than 0.2 mm.
  • some insulators can be selected for testing in different voltage lines. For example, in a 110kV line, one insulator is selected for each string, and two chips are selected for each string of 220kV lines. The insulator at the end is suitable. Due to the serious fouling on the surface of the RTV anti-fouling coating on the surface of the insulator after many years of operation, the presence of the stain will seriously affect the adhesion of the newly coated RTV anti-fouling coating to the original coating.
  • the surface of the insulator is wiped off by a dry flannel or non-woven fabric, and then the operating state of the insulator is determined according to the result of measuring the coating of the original RTV anti-smudge coating of the insulator, and the operating state can be divided into Three categories: 1, good operating conditions, no need for recoating, 2, poor operating conditions can be restored by the method of the present invention to restore a better operating state, 3, the operating state is very poor, can not be recoated Must be replaced.
  • the present invention preferably determines the operating state of the insulator by the following steps.
  • the water repellency is tested by a water spray classification method; the color of the coating is determined by using a color chart, and the coating defines nine colors, respectively, using numbers. 1 to 9 means that the smaller the number, the better the coating state. The larger the value is, the worse the coating state is. If the value is 1 to 5, the coating state is good. If the value is 6 to 9, the coating state is poor.
  • the step (2) includes the following sub-steps:
  • step (2.1) If the water repellency is HC1 to HC2, proceed to step (2.2), if the water repellency is HC5 to HC7 Step, proceed to step (2.3), if the water repellency is HC3 ⁇ HC4 level, proceed to step (2.4);
  • step (2.2) If the coating color is 1-5, the insulator does not need to be coated, if the coating color is 6-9, proceed to step (2.4);
  • step (2.3) If the coating color is 1-5, proceed to step (2.4). If the coating color is 6-9, the insulator cannot be recoated;
  • the upper surface of the insulator body is selected to be adjacent to the steel cap for adhesion test, and when the adhesion test is performed, the original coating surface may be gently removed using the absorbent cotton.
  • the water droplets or water film should be wiped off. It should not be wiped with force. Otherwise, it will affect the adhesion of the original coating to the surface of the insulator.
  • the nine colors specified in the coating color chart are numerically represented by the RGB color space (the following RGB values are integers), and the numbers 1 to 9 are respectively expressed as:
  • the numbers 1 to 9 are respectively expressed as:
  • the coating color chart can be drawn using a drawing software (such as Photoshop, etc.) for the determination of the color of the coating.
  • a drawing software such as Photoshop, etc.
  • the water spray classification method is used for the water repellency test
  • the water spray is sprayed with watering can, so that the water drops cover the entire surface of the insulator, and according to the conventional judgment method in the art, the poor part is selected for the water repellency test; or the insulator body can also be used.
  • the upper surface and the lower surface were respectively subjected to a hydrophobic test, and the result with poor test results was selected as the final hydrophobic value.
  • the solid content of the RTV anti-soil flash coating can be determined in advance according to the "GBT 1725-2007 determination of the non-volatile content of paints, varnishes and plastics" for the re-coated RTV anti-smudge flash coating.
  • the coating recoated by the method of the invention satisfies the following conditions: 1. The surface of the insulator is completely covered, and there is no leaked coating portion; 2. The surface of the coating layer is not piled up, hanged, and flowed; 3. The surface of the coating remains smooth, There is no unevenness visible to the naked eye; 4. Water repellency: It can be detected by water spray classification method, which can reach HC1 ⁇ HC2 level; 5. Coating thickness; slice sampling of coating, thickness measurement, total thickness (new coating) The sum of the thickness of the original coating and the thickness of the original coating is not less than 0.35 mm. The sampling is performed on the edge of the upper surface of the insulator body and the upper surface near the steel cap. The sampling is not less than 10 ⁇ 10 mm.
  • Adhesion using the cross-cut method on the insulator
  • the upper surface of the body is placed near the steel cap, and the adhesion level is ISO0 to ISO2.
  • the above six test results measured by the invention can be used as the acceptance standard after recoating, and if the one is not met at the time of acceptance, it can indicate that the coating process does not meet the requirements.
  • the result is that the leakage current value of the surface of the insulator after recoating is kept below 1 mA, and the antifouling is good. Flash ability.

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Abstract

　本发明公开了涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法，绝缘子包括绝缘子本体、与绝缘子本体的上表面连接的钢脚和与绝缘子本体的下表面连接的钢帽，包括：（1）拭去绝缘子表面的污秽；（2）判断绝缘子是否可以重新涂覆；（3）用固含量为55～65％的RTV防污闪涂料涂覆：在绝缘子本体以及钢脚与绝缘子本体的上表面连接的接缝处喷涂时，压力0.6±0.1Mpa，喷嘴与被喷涂表面的距离200±50mm，气流轴心线与被喷涂表面的夹角70-90°，在同一个部位的停留时间1～2s；在钢帽与绝缘子本体的下表面连接的接缝处喷涂时压力为0.6±0.1Mpa，喷嘴与接缝处的距离100±30mm，气流轴心线与绝缘子本体的下表面的夹角0-20°，在同一个部位的停留时间≤1s；至少喷两遍，新涂层厚度≥0.2mm。

Description

涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法 技术领域
本发明涉及电力系统中绝缘子的处理，特别是涉及一种涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法。
背景技术
在电力系统中，使用室温硫化型硅橡胶防污闪涂料(简称为RTV防污闪涂料)是一种非常重要的防污闪措施。将RTV防污闪涂料涂覆在绝缘子表面能够显著提高绝缘子的憎水性，进而提高其污闪电压，防治污闪事故。但是RTV防污闪涂料的耐候性较差，在长期运行过程中易受到电场、光照、高湿度等因素的影响发生老化，从而使得表面憎水性下降；在一些污染较重的地区，RTV防污闪涂料的表面会因污秽累积过多导致憎水性下降甚至消失。在这种情况下一般采取的措施是对绝缘子进行更换，并在新更换的绝缘子表面涂覆RTV防污闪涂料。但这种处理措施成本高，且会造成绝缘子的浪费。
发明内容
本发明所要解决的技术问题是：弥补上述现有技术的不足，提出一种涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法，在能够在不更换绝缘子的情况下恢复绝缘子表面的憎水性，保证其防污闪特性不下降。
本发明的技术问题通过以下的技术方案予以解决：
一种涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法，所述绝缘子包括绝缘子本体、与所述绝缘子本体的上表面连接的钢脚和与所述绝缘子本体的下表面连接的钢帽，包括如下步骤：
(1)拭去所述绝缘子表面的污秽；
(2)根据所述绝缘子表面的原有RTV防污闪涂料的涂层的憎水性和附着力两者结合，或增水性、涂层颜色和附着力三者结合来判断所述绝缘子是否可以重新涂覆；
(3)将可以重新涂覆的绝缘子进行如下涂覆：
(3.1)使用喷枪在所述绝缘子本体以及所述钢脚与所述绝缘子本体的上表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述绝缘子的被喷涂表面的距离为200±50mm，气流轴心线与被喷涂表面的夹角为70-90°，喷涂时在同一个部位的停留时间为1～2s；
(3.2)使用喷枪在所述钢帽与所述绝缘子本体的下表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述接缝处的距离为100± 30mm，气流轴心线与所述绝缘子本体的下表面的夹角为0-20°，喷涂时在同一个部位的停留时间不超过1s；
所述步骤(3.1)和(3.2)中重新涂覆的所述RTV防污闪涂料的固体质量含量为55％～65％，至少喷涂两遍，新涂覆的RTV防污闪涂料的涂层厚度不小于0.2mm。
直接在原有RTV防污闪涂料的涂层表面进行重新涂覆时新涂覆的涂料对原有涂层有很大影响，同时，原有涂层对新涂覆的涂料的喷涂效果也有很大影响，本发明在喷涂过程中，采用以上技术方案中的工艺条件重新涂覆的RTV防污闪涂料经测试，其憎水性可以达到HC1～HC2级，附着力等级为ISO0～ISO2级，总厚度(新涂层和原有涂层厚度之和)不小于0.35mm，同时，可以避免重新涂覆过程中对原有涂层的冲击、溶胀破坏，例如，喷涂时的压力若过大会对原有涂层表面造成冲击，影响原有涂层与绝缘子的附着力进而影响新涂覆的RTV防污闪涂料的涂层的附着力，而如果压力过小，则会影响喷涂效果；喷涂时在同一部位的停留时间如果过长，溶剂会引起原有涂层的局部溶胀，同时，涂料的固体质量含量如果太低也会造成原有涂层的溶胀，含量太高会影响喷涂时的雾化效果。
优选地，所述步骤(1)中，采用干燥的法兰绒或无纺布将所述绝缘子表面的污秽拭去。
优选地，所述步骤(2)中，采用喷水分级法测试所述憎水性；采用涂层比色卡对所述涂层颜色进行判定，所述涂层比色卡规定了9种颜色，分别用数字1～9表示，如果数值为1～5表示涂层状态较好，如果数值为6～9表示涂层状态较差；所述步骤(2)包括如下分步骤：
(2.1)如果憎水性为HC1～HC2级，则进行步骤(2.2)，如果憎水性为HC5～HC7级，则进行步骤(2.3)，如果憎水性为HC3～HC4级，则进行步骤(2.4)；
(2.2)如果涂层颜色为1～5，则所述绝缘子无需进行涂覆，如果涂层颜色为6～9，则进行步骤(2.4)；
(2.3)如果涂层颜色为1～5，则进行步骤(2.4)，如果涂层颜色为6～9，则所述绝缘子无法进行重新涂覆；
(2.4)采用划格法测试所述附着力，如果附着力为ISO4～ISO6级，则所述绝缘子无法进行重新涂覆，如果附着力为ISO0～ISO3级，则所述绝缘子可以重新涂覆。
优选地，所述分步骤(2.4)中，选取所述绝缘子本体的上表面靠近钢帽的地方进行附着力测试。
优选地，所述涂层比色卡中规定的9种颜色用RGB色彩空间进行数值表示，数字 1～9分别表示为：
  R G B
1 147～152 68～78 55～64
2 153～157 79～87 65～74
3 158～162 88～98 75～84
4 163～167 99～107 85～94
5 168～172 108～118 95～104
6 173～177 119～127 105～114
7 178～182 128～138 115～124
8 183～187 139～147 125～134
9 188～192 148～158 135～144
优选地，数字1～9分别表示为：
  R G B
1 150 73 60
2 155 83 70
3 160 93 80
4 165 103 90
5 170 113 100
6 175 123 110
7 180 133 120
8 185 143 130
9 190 153 140
优选地，进行喷水分级法进行憎水性测试时，用喷壶进行喷水，使水珠布满整个绝缘子表面，选取较差的部位进行憎水性测试。
本发明能够对已经涂覆有RTV防污闪涂料的绝缘子进行重新涂覆，在依照本发明规程完成涂覆后，新涂覆的防污闪涂料能够紧密附着于绝缘子表面，不发生溶胀现象，涂料与绝缘子的附着力不下降，且表面的憎水性得到恢复，能够保证绝缘子的污闪电压不下降。
具体实施方式
下面结合优选的实施方式对本发明作进一步说明。
本发明提供一种涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法，所述绝缘子包括绝缘子本体、与所述绝缘子本体的上表面连接的钢脚和与所述绝缘子本体的下表面连接的钢帽，在一种具体实施方式中，包括如下步骤：
(1)拭去所述绝缘子表面的污秽；
(2)根据所述绝缘子表面的原有RTV防污闪涂料的涂层的憎水性和附着力两者结合，或增水性、涂层颜色和附着力三者结合来判断所述绝缘子是否可以重新涂覆；
(3)将可以重新涂覆的绝缘子进行如下涂覆：
(3.1)使用喷枪在所述绝缘子本体以及所述钢脚与所述绝缘子本体的上表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述绝缘子的被喷涂表面的距离为200±50mm，气流轴心线与被喷涂表面的夹角为70-90°，喷涂时在同一个部位的停留时间为1～2s；
(3.2)使用喷枪在所述钢帽与所述绝缘子本体的下表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述接缝处的距离为100±30mm，气流轴心线与所述绝缘子本体的下表面的夹角为0-20°，喷涂时在同一个部位的停留时间不超过1s；
所述步骤(3.1)和(3.2)中重新涂覆的所述RTV防污闪涂料的固体质量含量为55％～65％，至少喷涂两遍，新涂覆的RTV防污闪涂料的涂层厚度不小于0.2mm。
在选取绝缘子时，可以在不同电压的线路中各抽选一部分绝缘子进行测试，如，在110kV线路中，每串选取1片绝缘子，220kV线路每串选取2片，在每串中均选取位于高压端的绝缘子为宜。由于运行多年之后的绝缘子表面的RTV防污闪涂料表面会有比较严重的积污现象，污层的存在会严重影响新涂覆的RTV防污闪涂料与原有涂层的粘接性，优选采用干燥的法兰绒或无纺布将所述绝缘子表面的污秽拭去，然后根据对绝缘子原有的RTV防污闪涂料的涂层的测定的结果确定绝缘子的运行状态，运行状态可以分为三类：1、运行状态良好，不需要重涂，2、运行状态较差但可以通过本发明的方法重新涂覆后恢复较好的运行状态，3、运行状态很差，无法进行重新涂覆，必须进行更换。本发明优选通过以下步骤判断绝缘子的运行状态。
所述步骤(2)中，采用喷水分级法测试所述憎水性；采用涂层比色卡对所述涂层颜色进行判定，所述涂层比色卡规定了9种颜色，分别用数字1～9表示，数字越小说明涂层状态越好，越大说明涂层状态越差，如果数值为1～5表示涂层状态较好，如果数值为6～9表示涂层状态较差，所述步骤(2)包括如下分步骤：
(2.1)如果憎水性为HC1～HC2级，则进行步骤(2.2)，如果憎水性为HC5～HC7 级，则进行步骤(2.3)，如果憎水性为HC3～HC4级，则进行步骤(2.4)；
(2.2)如果涂层颜色为1～5，则所述绝缘子无需进行涂覆，如果涂层颜色为6～9，则进行步骤(2.4)；
(2.3)如果涂层颜色为1～5，则进行步骤(2.4)，如果涂层颜色为6～9，则所述绝缘子无法进行重新涂覆；
(2.4)采用划格法测试所述附着力，如果附着力为ISO4～ISO6级，则所述绝缘子无法进行重新涂覆，如果附着力为ISO0～ISO3级，则所述绝缘子可以重新涂覆。
更优选的，在所述分步骤(2.4)中，选取所述绝缘子本体的上表面靠近钢帽的地方进行附着力测试，在进行附着力测试时，可以使用脱脂棉轻轻将原有涂层表面的水珠或水膜擦去，不宜用力擦拭，否则会影响原有涂层对绝缘子表面的附着力。在所述涂层比色卡中规定的9种颜色用RGB色彩空间进行数值表示(以下RGB的数值均为整数)，数字1～9分别表示为：
  R G B
1 147～152 68～78 55～64
2 153～157 79～87 65～74
3 158～162 88～98 75～84
4 163～167 99～107 85～94
5 168～172 108～118 95～104
6 173～177 119～127 105～114
7 178～182 128～138 115～124
8 183～187 139～147 125～134
9 188～192 148～158 135～144
进一步优选的，数字1～9分别表示为：
  R G B
1 150 73 60
2 155 83 70
3 160 93 80
4 165 103 90
5 170 113 100
6 175 123 110
7 180 133 120
8 185 143 130
9 190 153 140
根据上表的RGB值，可以使用绘图软件(如Photoshop等)绘制涂层比色卡以用于涂层颜色的判定。进行喷水分级法进行憎水性测试时，用喷壶进行喷水，使水珠布满整个绝缘子表面，根据本领域常规的判断方法，选取较差的部位进行憎水性测试；或者也可以对绝缘子本体的上表面和下表面分别进行憎水性测试，选取测试结果较差的结果作为最终的憎水性值。
RTV防污闪涂料的固体质量含量可以依照《GBT 1725-2007色漆、清漆和塑料不挥发物含量的测定》预先对重新涂覆的RTV防污闪涂料进行固体含量测定。
通过本发明的方法重新涂覆的涂层满足以下条件：1、将绝缘子表面全部覆盖，没有漏涂部位；2.涂层表面没有堆积、挂丝、流淌现象；3.涂层表面保持光滑，没有肉眼可见的不平整现象；4、憎水性：使用喷水分级法进行检测，可以达到HC1～HC2级；5、涂层厚度；对涂层进行切片取样，测量厚度，总厚度(新涂层和原有涂层厚度之和)不小于0.35mm，取样在绝缘子本体的上表面边缘和上表面靠近钢帽处分别进行，取样不小于10X10mm为宜；6、附着力：使用划格法在绝缘子本体的上表面靠近钢帽处进行，附着力等级为ISO0～ISO2级。本发明测得的以上6项测试结果可以作为重新涂覆后的验收标准，如果验收时，只要有一项不达标就可以表示涂覆工艺不满足要求。通过实验室中模拟其在长时间大雾条件下测试本发明重新涂覆的绝缘子的运行状态，其结果为：重新涂覆后绝缘子表面的泄漏电流值保持在1mA以下，有很好的防污闪能力。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的技术人员来说，在不脱离本发明构思的前提下，还可以做出若干等同替代或明显变型，而且性能或用途相同，都应当视为属于本发明的保护范围。

Claims (7)

  1. 一种涂有RTV防污闪涂料的绝缘子重新涂覆RTV防污闪涂料的方法，所述绝缘子包括绝缘子本体、与所述绝缘子本体的上表面连接的钢脚和与所述绝缘子本体的下表面连接的钢帽，其特征在于，包括如下步骤：
    (1)拭去所述绝缘子表面的污秽；
    (2)根据所述绝缘子表面的原有RTV防污闪涂料的涂层的憎水性和附着力两者结合，或增水性、涂层颜色和附着力三者结合来判断所述绝缘子是否可以重新涂覆；
    (3)将可以重新涂覆的绝缘子进行如下涂覆：
    (3.1)使用喷枪在所述绝缘子本体以及所述钢脚与所述绝缘子本体的上表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述绝缘子的被喷涂表面的距离为200±50mm，气流轴心线与被喷涂表面的夹角为70-90°，喷涂时在同一个部位的停留时间为1～2s；
    (3.2)使用喷枪在所述钢帽与所述绝缘子本体的下表面连接的接缝处喷涂RTV防污闪涂料：喷涂时压力为0.6±0.1Mpa，所述喷枪的喷嘴与所述接缝处的距离为100±30mm，气流轴心线与所述绝缘子本体的下表面的夹角为0-20°，喷涂时在同一个部位的停留时间不超过1s；
    所述步骤(3.1)和(3.2)中重新涂覆的所述RTV防污闪涂料的固体质量含量为55％～65％，至少喷涂两遍，新涂覆的RTV防污闪涂料的涂层厚度不小于0.2mm。
  2. 如权利要求1所述的方法，其特征在于：所述步骤(1)中，采用干燥的法兰绒或无纺布将所述绝缘子表面的污秽拭去。
  3. 如权利要求1所述的方法，其特征在于：所述步骤(2)中，采用喷水分级法测试所述憎水性；采用涂层比色卡对所述涂层颜色进行判定，所述涂层比色卡规定了9种颜色，分别用数字1～9表示，如果数值为1～5表示涂层状态较好，如果数值为6～9表示涂层状态较差；所述步骤(2)包括如下分步骤：
    (2.1)如果憎水性为HC1～HC2级，则进行步骤(2.2)，如果憎水性为HC5～HC7级，则进行步骤(2.3)，如果憎水性为HC3～HC4级，则进行步骤(2.4)；
    (2.2)如果涂层颜色为1～5，则所述绝缘子无需进行涂覆，如果涂层颜色为6～9，则进行步骤(2.4)；
    (2.3)如果涂层颜色为1～5，则进行步骤(2.4)，如果涂层颜色为6～9，则所述绝缘子无法进行重新涂覆；
    (2.4)采用划格法测试所述附着力，如果附着力为ISO4～ISO6级，则所述绝缘子无法进行重新涂覆，如果附着力为ISO0～ISO3级，则所述绝缘子可以重新涂覆。
  4. 如权利要求3所述的方法，其特征在于：所述分步骤(2.4)中，选取所述绝缘子本体的上表面靠近钢帽的地方进行附着力测试。
  5. 如权利要求3所述的方法，其特征在于：所述涂层比色卡中规定的9种颜色用RGB色彩空间进行数值表示，数字1～9分别表示为：
      R G B 1 147～152 68～78 55～64 2 153～157 79～87 65～74 3 158～162 88～98 75～84 4 163～167 99～107 85～94 5 168～172 108～118 95～104 6 173～177 119～127 105～114 7 178～182 128～138 115～124 8 183～187 139～147 125～134 9 188～192 148～158 135～144
  6. 如权利要求5所述的方法，其特征在于：数字1～9分别表示为：
      R G B 1 150 73 60 2 155 83 70 3 160 93 80 4 165 103 90 5 170 113 100 6 175 123 110 7 180 133 120 8 185 143 130 9 190 153 140
  7. 如权利要求3所述的方法，其特征在于：进行喷水分级法进行憎水性测试时，用喷壶进行喷水，使水珠布满整个绝缘子表面，选取较差的部位进行憎水性测试。
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CN106443393A (zh) * 2016-11-17 2017-02-22 武汉大学 一种绝缘子模拟rtv涂层脱落的污闪试验方法
CN114496424A (zh) * 2022-03-31 2022-05-13 萍乡华创电气有限公司 一种柱式绝缘子及其制作方法
CN114496424B (zh) * 2022-03-31 2024-04-26 萍乡华创电气有限公司 一种柱式绝缘子及其制作方法

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