CN105237789A - 一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法 - Google Patents

一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法 Download PDF

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CN105237789A
CN105237789A CN201510705359.3A CN201510705359A CN105237789A CN 105237789 A CN105237789 A CN 105237789A CN 201510705359 A CN201510705359 A CN 201510705359A CN 105237789 A CN105237789 A CN 105237789A
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CN105237789B (zh
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贾志东
叶蔚安
黎一杉
刘世涛
郭飞
吴旭涛
车俊禄
摆存曦
吴波
常彬
李秀广
郝金鹏
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Shenzhen Graduate School Tsinghua University
Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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Electric Power Research Institute of State Grid Ningxia Electric Power Co Ltd
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Abstract

本发明公开了一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法，包括以下步骤：用RTV防污闪涂料作为第一层涂层，涂覆在电蚀损坑洞表面，使坑洞表面平滑；用单组份RTV修补胶作为第二层涂层对电蚀损坑洞进行填补，填平电蚀损坑洞，并与所述第一层涂层紧密粘接；用RTV防污闪涂料作为第三层涂层，涂覆在所述第二层涂层上。本发明的方法可使得发生电蚀损的液体硅橡胶伞裙护套外观和性能得以有效恢复。

Description

一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法
技术领域
本发明涉及一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法。
背景技术
硅橡胶复合绝缘材料因其优异的耐候性、耐漏电起痕和电蚀损性能和良好电气绝缘性能，目前在电网中得到广泛应用。目前国内外在电网中使用的硅橡胶绝缘材料主要有三种：高温硫化硅橡胶(HTV)，室温硫化硅橡胶(RTV)，液体硅橡胶(LSR，也叫做中温硫化硅橡胶)。
我国电力系统从上世纪80年代起开始使用硅橡胶作为绝缘材料，典型的应用是硅橡胶复合绝缘子和RTV防污闪涂料，以及用于护套和支柱绝缘子上的液体硅橡胶。复合绝缘材料的使用有效地提高了我国电网的耐污闪能力。
在硅橡胶复合绝缘材料中，液体硅橡胶除了具有优良的电气性能、耐热耐寒性、耐电弧性能以外，还具有流动性好、粘度低、工艺简单、快速成型的优点。因此，液体硅橡胶在外绝缘护套上得到广泛应用。但在我国部分地区运行的互感器LSR伞裙外套出现了明显而严重的老化现象。特别是在高污秽度地区，由于部分可导电污秽附着在液体硅橡胶表面，引起局部电场畸变，在伞裙表面产生火花状放电或者火弧烧蚀，产生电蚀损坑洞。电蚀损坑洞的产生，严重影响电气设备的安全运行，其运行可靠性受到质疑。
电蚀损坑洞的修复是为了在液体硅橡胶伞裙表面发生电蚀损之后，修复其表面的物理性能和电气性能。属于对液体硅橡胶材料意外受损的修复，这一点上与针对材料老化之后进行的二次复涂有差别。
发明内容
本发明的主要目的在于提供一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法，使得发生电蚀损的液体硅橡胶伞裙护套外观和性能得以恢复。
为实现上述目的，本发明采用以下技术方案：
一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法，包括以下步骤：
用RTV防污闪涂料作为第一层涂层，涂覆在电蚀损坑洞表面，使坑洞表面平滑；
用单组份RTV修补胶作为第二层涂层对电蚀损坑洞进行填补，填平电蚀损坑洞，并与所述第一层涂层紧密粘接；
用RTV防污闪涂料作为第三层涂层，涂覆在所述第二层涂层上。
进一步地：
用作所述第一层涂层和/或所述第二层涂层的RTV防污闪涂料满足标准DL/T627-2012。
所述单组份RTV修补胶具有如下性能：
拉伸强度(MPa)≥2.0
相对伸长率(％)≥200
硬度(HA)≥20
电气强度(MV/m)≥17。
在涂覆所述第一层涂层之前，对电蚀损坑洞进行打磨和清洗。
所述打磨包括对电蚀损坑洞周围进行打磨，使电蚀损坑洞周围的界面平滑。
用单组份RTV修补胶对电蚀损坑洞进行填补的过程包括：将修补胶均匀涂抹直至第二层涂层表面平整，并与伞裙表面平齐。
本发明的有益效果：
本发明的方法能够有效修复液体硅橡胶制成的伞裙表面发生电蚀损之后产生的坑洞，本方法考虑了电蚀损坑洞表面受损情况，抑制修补界面气泡及填补后伞裙表面的物理性能、电气性能等因素，特别适于修复浅层电蚀损坑洞，其修复伞裙质量高，可靠性强。经过本方法修复的液体硅橡胶护套伞裙憎水性、耐漏电起痕和电蚀损性能可以达到发生电蚀损之前的水平。
附图说明
图1为本发明一种具体实施例的流程图；
图2为修复前的浅层电蚀损坑洞效果图；
图3为依照本发明实施例的修复方法填涂完修补胶的效果图；
图4为依照本发明实施例的修复方法修复完成后的效果图。
具体实施方式
以下对本发明的实施方式作详细说明。应该强调的是，下述说明仅仅是示例性的，而不是为了限制本发明的范围及其应用。
参见图2，液体硅橡胶制成的伞裙表面的浅层电蚀损情况一般有如下的特点：(1)深度在5mm以内；(2)表面粗糙、有明显的烧蚀痕迹；(3)容易粘附污秽，引起进一步的烧蚀。
在一种实施例中，本发明的修复方法包括以下几个步骤：
(1)修复前对需要修复的电蚀损坑洞进行打磨和清洗，使得表面条件适合于修补。
(2)用RTV防污闪涂料改善修补界面的性能，使修补界面平整、光滑，抑制界面气泡产生。优选用满足标准DL/T627-2012的RTV防污闪涂料作为第一层涂层，使坑洞表面平滑，粘接牢固，解决了直接用后续用修补胶修补后界面产生气泡的问题。
(3)用单组份RTV中高粘度的修补胶填补坑洞，修补胶的技术性能满足表1所示。使用单组份RTV修补胶作为第二层涂层来填补电蚀损坑洞，单组份RTV修补胶粘接性能好，而且固体含量高，在填补之后不会产生凹陷，凸起的问题，并且能够与上一层的RTV粘接紧密。
浅层电蚀损只是在硅橡胶伞裙上产生凹陷状的坑洞，没有产生贯穿伞裙的坑洞，可以采用单组份RTV修补胶进行修补。RTV中专门用于修补的修补胶流淌性适中、粘度大、固体含量高，适合于修补硅橡胶的缺陷。修补胶技术性能如表1：
表1RTV修补胶技术性能
(4)用RTV防污闪涂料改善液体硅橡胶伞裙表面的憎水性、耐漏电起痕和电蚀损性能。使用满足标准DL/T627-2012的RTV防污闪涂料作为第三层涂层，起到增强表面憎水性，提高耐漏电起痕和电蚀损性能的作用。使修复之后憎水性能达到HC1级，耐漏电起痕和电蚀损性能可以达到TMA3.5级。
在如图1所示的具体实例中，修复过程可按照如下的步骤进行：
(1)环境因素判断
硅橡胶的修补选择在没有风沙、降雨、降雪的天气中进行，如果环境因素不允许则暂不进行修复。
(2)坑洞打磨
蚀损的坑洞表面粗糙不平，蚀损痕迹和粉尘较多，使用打磨机对坑洞周围进行打磨，使坑洞周围的界面平滑。
(3)表面清洁
使用溶剂比如无水乙醇清洁坑洞内的灰尘，包括烧蚀的坑洞内的原有积污和打磨过程中残留的灰尘。如果积污较多，可以多次擦拭，确保在修补之前坑洞内清洁。
(4)喷涂第一层RTV防污闪涂料
待表面溶剂挥发干之后，喷涂第一层RTV防污闪涂料。喷涂时应对坑洞及其周围均匀喷涂，至涂料完全覆盖坑洞表面为止。RTV防污闪涂料应满足标准DL/T627-2012。
(5)填涂修补胶
待24h第一层防污闪涂料固化之后，将修补胶均匀涂抹在坑洞内，用腻子刀将修补胶均匀涂抹，直至修补胶表面平整，与伞裙平齐。
(6)涂覆第二层RTV防污闪涂料
待24h修补胶固化之后，检查修补部分。如果修补界面没有气泡，并且用手掰伞裙部分时，界面粘接牢固，不出现开裂，则涂覆第二层RTV防污闪涂料，RTV防污闪涂料应满足标准DL/T627-2012。如果出现了界面粘接不牢固，则用刀片刮除修补胶，回到步骤(1)重新开始修补。
(7)验收
待第二层RTV涂料固化之后，用手掰伞裙，表面没有出现裂纹，两层涂料之间粘接紧密，没有涂层脱落现象，验收通过。如果验收不通过，则用刀片刮除RTV和修补胶，回到步骤(1)重新开始修补。
修补前后效果对比见图2-图4。使用中蓝晨光的GD-442单组份RTV作为修补胶，使用瓦克Powersil作为防污闪涂料，修复之后测试憎水性为HC1级，斜面法测试其耐漏电起痕和电蚀损性能测试结果为TMA3.5级，与电蚀损之前液体硅橡胶的性能相似。
以上内容是结合具体/优选的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普通技术人员来说，在不脱离本发明构思的前提下，其还可以对这些已描述的实施方式做出若干替代或变型，而这些替代或变型方式都应当视为属于本发明的保护范围。

Claims (6)

1.一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法，其特征在于,包括以下步骤：
用RTV防污闪涂料作为第一层涂层，涂覆在电蚀损坑洞表面，使坑洞表面平滑；
用单组份RTV修补胶作为第二层涂层对电蚀损坑洞进行填补，填平电蚀损坑洞，并与所述第一层涂层紧密粘接；
用RTV防污闪涂料作为第三层涂层，涂覆在所述第二层涂层上。
2.如权利要求1所述的方法，其特征在于,用作所述第一层涂层和/或所述第二层涂层的RTV防污闪涂料满足标准DL/T627-2012。
3.如权利要求1所述的方法，其特征在于,所述单组份RTV修补胶具有如下性能：
拉伸强度(MPa)≥2.0
相对伸长率(％)≥200
硬度(HA)≥20
电气强度(MV/m)≥17。
4.如权利要求1至3任一项所述的方法，其特征在于,在涂覆所述第一层涂层之前，对电蚀损坑洞进行打磨和清洗。
5.如权利要求4所述的方法，其特征在于,所述打磨包括对电蚀损坑洞周围进行打磨，使电蚀损坑洞周围的界面平滑。
6.如权利要求1至5任一项所述的方法，其特征在于,用单组份RTV修补胶对电蚀损坑洞进行填补的过程包括：将修补胶均匀涂抹直至第二层涂层表面平整，并与伞裙表面平齐。
CN201510705359.3A 2015-10-27 2015-10-27 一种修复液体硅橡胶护套伞裙表面电蚀损坑洞的方法 Expired - Fee Related CN105237789B (zh)

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