环氧基纳米复合绝缘材料沿面闪络气-固耦合作用机理和性能提高的研究

项目名称： 环氧基纳米复合绝缘材料沿面闪络气-固耦合作用机理和性能提高的研究

项目编号： No.51337008

项目类型： 重点项目

立项/批准年度： 2014

项目学科： 电工技术

项目作者： 李盛涛

作者单位： 西安交通大学

项目金额： 315万元

中文摘要： 绝缘沿面闪络是先进输变电装备中电气绝缘的关键基础科学问题，该科学问题的研究对于先进输变电装备和绝缘材料的发展具有重要意义。然而，现有模型和机理仍不能全面合理解释沿面闪络现象。本项目围绕绝缘介质沿面闪络特性和机理，以环氧基纳米复合绝缘材料为研究对象，考虑气相表层、气固界面、介质表层中的电荷输运/倍增及其耦合作用，采用介质体击穿逾渗模型、双极性电荷输运和连续时间行走模型，研究介质表层电荷输运，表面二次电子发射特性，气相表层的电离及倍增特性等对沿面闪络的影响规律。进而揭示介质表层电荷输运、表面电荷输运/倍增、气相表层电荷输运/倍增的耦合作用，建立介质表层-表面-气相表层中电荷输运/倍增过程相互耦合的沿面闪络模型。提出提高环氧基纳米复合绝缘材料沿面闪络性能的理论方法。为研制先进输变电装备和纳米复合绝缘材料提供理论基础和实验依据。

中文关键词： 沿面闪络;气-固耦合;电荷输运;纳米电介质;

英文摘要： Surface flashover of insulting materials is a key fundamental scientific problem in electrical insulation of advanced power transmission and transformation equipments. Investigations on the surface flashover are significantly important for the development of advanced power transmission and transformation equipments and insulating materials. However, the existing models and mechanisms have some shortcomings to interpret the surface flashover phenomena completely and reasonably. The present project will focus on the surface flashover characteristics and mechanisms of epoxy nanocomposites. We will investigate the influences of charge transport properties in the deep surface layer, secondary electron emission properties in shallow surface layer, charge ionization/multiplication in gaseous layer on the surface flashover properties by adopting bulk breakdown percolation model, bipolar charge transport model and continuous time random walk model. In addition, we will explore the coupling mechanisms of charge transport properties in the deep surface layer, charge transport/multiplication properties in shallow surface layer and charge ionization/multiplication in gaseous layer. Then, a novel surface flashover model will be established by considering the coupling mechanisms of charge transport/multiplication properties in the deep surface layer, shallow surface layer and gaseous layer. Furthermore, a theoretical method will be proposed to improve the surface flashover characteristics of epoxy nanocomposites. The project will provide theoretical and experimental basis for the development of advanced power transmission and transformation equipments and insulating materials.

英文关键词： surface flashover;gaseous phase-solid coupling ;charge transport;nanocomposites