复合绝缘子冰凌生长特性及其影响因素

发布时间：2018-07-18 07:41

【摘要】：复合绝缘子由于伞群间距较小,与玻璃和瓷质绝缘子相比更容易发生覆冰闪络。为了研究复合绝缘子的冰凌生长特性,针对短串复合绝缘子进行了电场仿真分析和覆冰试验,得到了冰凌生长与电场分布之间的作用关系,并研究了电压和环境因素对复合绝缘子冰凌生长过程的影响。结果表明,冰凌生长与电场分布相互作用,当尖端最高场强达到30 kV/cm时,局部电弧使冰凌生长速度减缓甚至停止;试验过程中沿串泄漏电流大小和局部放电程度受电压、环境温度、覆冰水电导率、降雨强度和染污程度等因素的影响,进而影响冰凌的生长过程和桥接情况,增大施加电压、环境温度、覆冰水电导率、染污程度或减小降雨强度均能延缓绝缘子冰凌生长速度。
[Abstract]:Composite insulators are more prone to ice flashover than glass and porcelain insulators because of the small distance between umbrella groups. In order to study the ice growth characteristics of composite insulators, the electric field simulation analysis and icing test of short series composite insulators are carried out, and the relationship between ice growth and electric field distribution is obtained. The effects of voltage and environmental factors on the growth process of composite insulators were studied. The results show that the ice growth interacts with the electric field distribution. When the maximum field intensity of the tip reaches 30 kV / cm, the ice growth rate is slowed down or even stopped by local arc, and the leakage current along the string and the degree of partial discharge are subjected to voltage during the experiment. The influence of environmental temperature, the conductivity of iced water, the intensity of rainfall and the degree of contamination will affect the growth process and bridging of ice, increase the applied voltage, increase the environmental temperature, and increase the conductivity of ice covered water. Contamination degree or decreasing rainfall intensity can delay the growth rate of insulator ice.
【作者单位】：清华大学深圳研究生院;清华大学电机工程与应用电子技术系;山西电力科学研究院;
【基金】：国家自然科学基金(51077081;51177081) 山西省电力公司科技项目(GCXMK13K009)~~
【分类号】：TM216

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