介电常数和表面性能对沿面流注发展的定量影响

发布时间：2018-04-30 17:38

本文选题：流注放电 + 绝缘介质　；参考：《中国电机工程学报》2014年09期

【摘要】：绝缘介质表面流注发展是沿面闪络中重要的物理过程,研究介质表面流注发展特性有助于揭示绝缘介质和流注放电之间的作用关系,加深对沿面闪络机制的认识。利用光电倍增管测量了绝缘介质表面的流注发展特性,其中被测绝缘介质是由两种厚度为5 mm的绝缘介质层层相叠组成的。通过改变被测试品中两种绝缘介质的体积,可以定量的估计绝缘介质的介电常数(容性)和表面性能对沿面流注发展特性的影响。试验中,测量了尼龙和聚四氟乙烯、复合绝缘材料和聚四氟乙烯两种组合试品的表面流注稳定传播电场和传播速度,发现绝缘介质表面性能对流注发展的影响很大。此外,3种绝缘介质中复合绝缘材料的表面性能最不利于流注的传播。
[Abstract]:The development of streamer on insulating dielectric surface is an important physical process in flashover along the surface. Studying the developing characteristics of streamer on dielectric surface is helpful to reveal the relationship between insulating dielectric and streamer discharge and to deepen the understanding of flashover mechanism along the surface. Using photomultiplier tube, the characteristics of streamer development on the surface of insulating medium are measured. The measured insulating medium is composed of two layers of insulating dielectric with thickness of 5 mm. By changing the volume of the two kinds of insulating media, the influence of dielectric constant (capacitance) and surface properties on the evolution of the flow along the surface can be quantitatively estimated. In the experiment, the steady propagation electric field and propagation velocity of the surface flux of nylon and PTFE, composite insulating material and PTFE were measured, and it was found that the surface properties of insulating medium had a great influence on the development of flow beam. In addition, the surface properties of composite insulating materials are the most disadvantageous to the propagation of streamer.
【作者单位】：清华大学深圳研究生院;中国电力科学研究院;
【基金】：国家重点基础研究发展计划项目(973项目)(2011CB 209406) 国家自然科学基金项目(50777033,50977048)~~
【分类号】：TM85

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