气压与湿度对绝缘介质表面流注发展特性影响的试验研究

发布时间：2019-06-14 09:39

【摘要】：目前,正在建设和规划的特高压线路大多将经过高海拔地区,沿线复杂的气象条件(气压、湿度)将使输电线路及电力设备的绝缘状况面临严峻的考验。因此,有必要重点研究气压、湿度变化对绝缘介质沿面闪络特性的影响,为特高压输电线路的绝缘设计提供理论依据。通过研究流注放电特性,从放电机制上探讨环境因素(气压、湿度)对沿面闪络特性的影响。在"三电极"结构中,利用光电倍增管测量了不同气压、湿度条件下绝缘介质表面流注传播特性。试验结果表明:流注稳定传播场强分别与气压、湿度成正比例关系;在相同的电场强度下,流注平均传播速度、流注头部发光强度都分别与气压、湿度成反比例关系。因此,流注在低气压、低湿度情况下容易发展,流注稳定传播场强较小,相同电场强度下,流注平均传播速度、流注头部发光强度较大。
[Abstract]:At present, most of the UHV lines under construction and planning will pass through the high altitude area, and the complicated weather conditions along the line (air pressure and humidity) will test the insulation condition of the power transmission line and the power equipment. Therefore, it is necessary to focus on the influence of air pressure and humidity on the flashover performance of the insulating medium along the surface, and provide the theoretical basis for the insulation design of the UHV transmission line. The effect of environmental factors (air pressure and humidity) on the surface flashover characteristics was discussed from the discharge mechanism by studying the discharge characteristics of the flow. In that "three-electrode" structure, the surface of the dielectric medium with different air pressure and humidity were measured by the photomultiplier tube. The experimental results show that the steady propagation field strength of the flow injection is in a positive ratio with the air pressure and the humidity. Under the same electric field intensity, the average velocity of the flow injection and the luminous intensity of the head are respectively inversely proportional to the air pressure and the humidity. Therefore, the flow injection is easy to develop under the condition of low air pressure and low humidity, and the steady propagation field strength of the flow injection is small. Under the same electric field intensity, the average velocity of the flow injection and the luminous intensity of the jet head are larger.
【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

【参考文献】