低温环境下绝缘介质表面流注放电特性

发布时间：2018-06-06 20:12

本文选题：沿面放电 + 低温低湿　；参考：《高电压技术》2017年05期

【摘要】：目前国内外关于低温条件下绝缘介质表面流注传播特性的研究较少,针对流注的相关试验研究主要在常温下进行。为研究低温低湿环境下绝缘介质表面流注的传播特性,在冰箱冷冻室内利用"三电极"结构研究了均匀场下绝缘介质表面流注的传播特性。主要的测量手段是利用3个光电倍增管来监测流注在介质表面的传播过程。测量了在不同温度下不同绝缘介质表面流注的传播概率,通过数据拟合得到流注的稳定传播场强,并且测量了在不同外加电场强度下流注传播速度的变化规律,最后研究了不同温度条件下流注传播特性的差异。试验结果表明:在低温低湿环境下,流注在绝缘介质表面传播的过程中拥有"沿面分量"和"空气分量"2个分量,流注的稳定传播场强比同条件下纯空气中流注的稳定传播场强大;对于同一种绝缘介质,稳定传播场强与温度近似呈指数下降关系,温度越低,流注的稳定传播场强越大;流注的传播速度随温度的降低而减小,但"沿面分量"的速度受影响的程度较大,大约在(3~8)×10~5 m/s内,而"空气分量"的变化则不太显著,在(1.5~3.0)×10~5 m/s范围内。
[Abstract]:At present, there are few researches on the characteristics of streamer propagation on the insulating dielectric surface at low temperature, and the related experimental studies are mainly carried out at room temperature. In order to study the propagation characteristics of flow on the surface of insulating medium in low temperature and low humidity environment, the "three-electrode" structure was used to study the propagation characteristics of flow on the surface of insulating medium in the refrigerator freezer. Three photomultiplier tubes are used to monitor the flow on the surface of the medium. The propagation probability of flow on the surface of different insulating media at different temperatures was measured. The steady propagation field strength of the flow was obtained by fitting the data, and the variation law of the velocity of flow beam was measured under different applied electric field intensity. Finally, the differences of the flow characteristics at different temperatures are studied. The experimental results show that in the low temperature and low humidity environment, there are two components, "side component" and "air component", in the process of flow on the surface of insulating medium. The steady propagating field strength of the flow beam is stronger than that of the flow in pure air under the same condition, and for the same insulating medium, the steady propagating field intensity and the temperature of the same insulating medium decrease exponentially, the lower the temperature, the greater the steady propagating field intensity of the flow beam. The velocity of stream flow decreases with the decrease of temperature, but the velocity of "side component" is affected greatly, about 8 脳 10 ~ (5) m / s, but the variation of "air component" is not significant, in the range of 1.5 ~ 3.0) 脳 10 ~ (5) m / s.
【作者单位】：清华大学深圳研究生院;
【基金】：国家自然科学基金(51307094)~~
【分类号】：TM85

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