Abstract Currently, insulator contamination is one of the most critical causes of flashover and security problems in high voltage power systems. To overcome this problem, Room Temperature Vulcanized (RTV) silicone rubber coating and recently nano-RTV composite coating are used in the contamination area as maintenance measures for porcelain insulator in power transmission lines. Nano-RTV coating is an approach to improve the properties of porcelain insulators and reliability of the power grid. This paper proposes a new model for evaluating the relationship between contamination level and critical flashover voltage in the presence of nano-RTV coating based on experimental results. Artificial contamination test was carried out in clean fog test on coated and non-coated insulators. Besides, a comparison was made between the surface hydrophobicity of these insulators through evaluating contact angles. Finally, in order to evaluate the effect of contamination intensity through insulator electrical stability on reliability, the life time expectation model was improved and modified. This modified model was employed to evaluate reliability and performance of RTV-coated, nano-RTV-coated, and non-coated porcelain insulators. Results show that using the nano-RTV- coated insulators can improve life time and failure probability density function of insulators compared to traditional coatings and non-coated ones particularly in contaminated area.

中文翻译：

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关于污染严重程度的 RTV 和纳米 RTV 涂层绝缘子的可靠性评估

摘要 目前，绝缘子污染是导致高压电力系统闪络和安全问题的最关键原因之一。为了克服这个问题，室温硫化（RTV）硅橡胶涂层和最近的纳米RTV复合涂层被用于污染区域作为输电线路瓷绝缘子的维护措施。纳米RTV涂层是提高瓷绝缘子性能和电网可靠性的一种途径。本文基于实验结果提出了一种新模型，用于评估存在纳米 RTV 涂层时污染水平与临界闪络电压之间的关系。人工污染试验是在有涂层和无涂层绝缘子的洁净雾试验中进行的。除了，通过评估接触角对这些绝缘体的表面疏水性进行了比较。最后，为了通过绝缘子电气稳定性评估污染强度对可靠性的影响，改进和修改了寿命期望模型。这种修改后的模型用于评估 RTV 涂层、纳米 RTV 涂层和非涂层瓷绝缘子的可靠性和性能。结果表明，与传统涂层和非涂层绝缘子相比，使用纳米 RTV 涂层绝缘子可以提高绝缘子的寿命和故障概率密度函数，尤其是在污染区域。对寿命期望模型进行了改进和修改。这种修改后的模型用于评估 RTV 涂层、纳米 RTV 涂层和非涂层瓷绝缘子的可靠性和性能。结果表明，与传统涂层和非涂层绝缘子相比，使用纳米 RTV 涂层绝缘子可以提高绝缘子的寿命和故障概率密度函数，尤其是在污染区域。对寿命期望模型进行了改进和修改。这种修改后的模型用于评估 RTV 涂层、纳米 RTV 涂层和非涂层瓷绝缘子的可靠性和性能。结果表明，与传统涂层和非涂层绝缘子相比，使用纳米 RTV 涂层绝缘子可以提高绝缘子的寿命和故障概率密度函数，尤其是在污染区域。