In the present study, long-term multi-stress aging performance of silicone-based polymeric insulators was investigated for possible use on high-voltage alternating current transmission lines in Pakistan. One neat sample of high-temperature-vulcanized silicone rubber and four silica and alumina trihydrate filled hybrid composites were studied for 5000 h under accelerated multi-stress aging simulating environment of Karachi. Several measurements and diagnostic techniques such as hydrophobicity assessment, leakage current measurement, scanning electron microscopy, Fourier transform infrared spectroscopy, tensile testing and shore-A hardness were deployed to better establish a reliable comparison of resistance-to-aging among the investigated samples. Through extensive analysis of all measured data, it was established that among the investigated five samples, the specimen representing silicone hybrid composite containing 2% nano-silica and 20% micro-silica showed the most superior performance. Expanding grid in Pakistan which has been facing several challenges in terms of pollution-related flashovers maybe made more reliable through use of silicone rubber hybrid insulators.

在本研究中，对有机硅基聚合物绝缘子的长期多应力老化性能进行了研究，以用于巴基斯坦的高压交流输电线路。在卡拉奇加速多应力老化模拟环境下，研究了一个纯净的高温硫化硅橡胶样品和四种填充二氧化硅和氧化铝的三水合杂化复合材料，历时5000 h。部署了多种测量和诊断技术，例如疏水性评估，泄漏电流测量，扫描电子显微镜，傅立叶变换红外光谱，拉伸测试和肖氏A硬度，以更好地建立所研究样品之间耐老化性的可靠比较。通过对所有测量数据的广泛分析，已经确定，在所研究的五个样品中，代表含有2％纳米二氧化硅和20％微二氧化硅的有机硅杂化复合材料的样品表现出最优异的性能。通过使用硅橡胶混合绝缘子，在与污染有关的闪络方面面临若干挑战的巴基斯坦扩展电网可能会变得更加可靠。