污秽和水分对瓷支柱绝缘子发热的影响

发布时间：2018-03-08 17:34

本文选题：瓷支柱绝缘子　切入点：水分　出处：《高电压技术》2015年09期 　论文类型：期刊论文

【摘要】：绝缘子表面污秽受潮和水分侵入瓷体均可导致瓷支柱绝缘子出现异常发热,比较二者所引起的温升规律具有重要的实际应用价值。为此,选取具有相同运行年限和气象环境条件的试品,发热试品在现场局部有明显发热,不发热试品表面温度分布均匀。研究结果表明:发热试品经干燥处理后发热点暂时性消失,浸泡后的试品温升最大值约为浸泡前数值的2倍,浸泡后高湿和自然风干两种状态下温升变化趋势一致,差值1℃。浸泡后的发热试品温升最大值出现在加压时长为180~240 min,浸泡时长72 h时的局部温升变化幅值增加不明显。不发热试品在退网、干燥处理等两种状态下各部位温升值均0.4℃,浸泡后在表面湿润状态下最大温升仅为1.2℃。发热试品表面污秽受潮湿润后的局部温升值远小于水分侵入瓷体后的温升值,浸泡前的发热试品热点位于7号伞瓷柱附近,浸泡后发热点迁移到3号伞瓷柱附近。发热试品异常发热系绝缘子低压端金具同瓷体胶装处有明显的裂纹和凹坑,该缺陷导致水分侵入瓷体后会引起瓷体局部出现异常发热。
[Abstract]:Insulators for moisture and moisture intrusion of porcelain body can lead to abnormal heating porcelain insulators, which has important practical application value of the two rise is caused by temperature. Therefore, it selects the same operation duration and meteorological condition test, local heating test items have obvious fever at the scene, without heating the sample surface the uniform temperature distribution. The results show that the heating test items after drying hot spots temporarily disappear, the sample temperature after soaking up the maximum value is about 2 times before immersion numerical, after immersion in high humidity and dry naturally two state temperature changing tendency, difference of 1 degrees Celsius. Fever after soaking the sample temperature is maximum in the pressure when the length of 180~240 min, 72 h long immersion local temperature rise during the amplitude change did not increase significantly. The heating test items in the back, 0 temperature values were all parts of dry treatment under two .4 C, after soaking in the surface under the wet condition the maximum temperature rise is only 1.2 degrees Celsius. The heating test of local temperature damp moist surface contamination after the appreciation is far less than that of water intrusion after porcelain body temperature rise, heating before immersion test hot spots located near the umbrella porcelain column No. 7, after soaking in hot spots migrating to nearby umbrella porcelain column No. 3. The heating test items of abnormal heating system with low voltage insulator porcelain fittings binding with obvious cracks and pits, the defects of water intrusion may cause porcelain porcelain body local abnormal heating.

【作者单位】：华北电力大学河北省输变电安全防御重点试验室;
【基金】：国家自然科学基金项目(51207055) 河北省自然科学基金(E2013502213)~~
【分类号】：TM216

【参考文献】