Infrared characteristics of surface discharges in dynamic dropping test for hydrophobicity evaluation of polymeric insulator

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI:10.1109/ICHVE.2012.6357078

Yong Liu, B. Du, Zhuoran Yang

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引用次数: 5

Abstract

Hydrophobicity performance of polymeric insulator in severe condition has caused more concern about reliability of power system, which increasingly requires the evaluation method for the surface hydrophobicity. In this research, based on the dynamic dropping test (DDT) method, infrared characteristics of surface discharges induced by dynamic behaviors of water droplet were investigated to carry out the hydrophobicity evaluation for different ageing levels of silicone rubber insulator. Both the dynamic morphology of water droplet and the induced discharge phenomena on the sample surface were captured by using an infrared camera to establish the relationship between the infrared radiation along the sample surface and the surface hydrophobicity. Methods of image processing and fractal dimension were employed to quantitatively analyze the infrared images. It is found that the maximum temperature and thermal distribution of discharges increase with the decrease of hydrophobicity. The increasing tendency in discharge strength and fractal dimension of thermal pattern can reveal the decrease of hydrophobicity. The results obtained indicate that the infrared characteristics of discharges in DDT method are sensitive to the hydrophobic properties, which can be applied as non-contact method for hydrophobicity evaluation of polymeric insulators.

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聚合物绝缘子疏水性动态跌落试验中表面放电的红外特性

聚合物绝缘子在恶劣工况下的疏水性性能引起了人们对电力系统可靠性的关注，对其表面疏水性评价方法的要求越来越高。本研究基于动态滴落试验(DDT)方法，研究水滴动态行为引起的表面放电的红外特性，对不同老化水平的硅橡胶绝缘子进行疏水性评价。利用红外摄像机捕捉样品表面水滴的动态形态和诱导放电现象，建立沿样品表面的红外辐射与表面疏水性的关系。采用图像处理和分形维数方法对红外图像进行定量分析。随着疏水性的降低，排放物的最高温度和热分布增大。放电强度和热图分形维数的增加趋势反映了疏水性的降低。结果表明，滴滴涕法放电的红外特性对聚合物绝缘子的疏水性能敏感，可作为评价聚合物绝缘子疏水性能的非接触方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 International Conference on High Voltage Engineering and Application

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