基于红外热像分析的绝缘子污闪过程中干区形成过程分析

发布时间：2018-11-15 11:28

【摘要】：形成干区是污闪发生的前提条件之一,为此重点从热的角度分析了干区的形成过程。用两端带有铝电极的矩形玻璃板模拟实际绝缘子,用红外热像仪拍摄了雾室中绝缘板表面干区形成中的温度分布变化,同时用泄漏电流测量系统实时记录了泄漏电流的变化。最后,将温度分布变化和泄漏电流趋势联系在一起,细致地分析了干区的形成过程,并得到了干区形成过程中的一些规律:加压之初,污层表面温度均匀稳定升高;干区形成之前污层表面会出现持续的高温区,局部干区首先形成在高温区;局部干区向完整干区的发展在温度分布上表现为高温在污层的贯穿;完整干区形成后,污层总体温度下降,但是干区呈现扩大趋势;干区达到稳定后,湿区温度降低为环境温度,干区依旧维持高温且温度由干区中心向两侧递减。因此,干区的形成不仅仅是一个电的过程,同时也是一个热的过程。
[Abstract]:The formation of dry area is one of the preconditions for the occurrence of pollution flashover, so the forming process of dry area is analyzed from the point of view of heat. A rectangular glass plate with aluminum electrodes at both ends is used to simulate the actual insulator. The temperature distribution during the formation of the dry area of the insulating plate surface in the fog chamber is photographed by infrared thermal imager, and the leakage current change is recorded in real time by the leakage current measurement system. Finally, the variation of temperature distribution and the trend of leakage current are associated with each other, and the formation process of dry zone is analyzed in detail, and some rules in the formation of dry zone are obtained: at the beginning of pressurization, the surface temperature of sewage layer increases steadily and uniformly; Before the formation of dry zone, there will be a persistent high temperature area on the surface of the sewage layer, and the local dry area will first form in the high temperature area, and the temperature distribution of the local dry area to the whole dry area will be the penetration of high temperature in the sewage layer. After the formation of the intact dry zone, the total temperature of the sewage layer decreased, but the dry zone showed a trend of expansion. After the dry zone reached stability, the temperature of the wet zone decreased to the ambient temperature, and the dry zone still maintained the high temperature and the temperature decreased from the center of the dry zone to the two sides of the dry zone. Therefore, the formation of dry areas is not only an electrical process, but also a thermal process.
【作者单位】：清华大学深圳研究生院;
【基金】：国家重点基础研究发展计划(973计划)(2009CB724503)~~
【分类号】：TM216

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