期刊文献+

运行断裂的500kV棒形悬式复合绝缘子蚀损试验和电场计算分析 被引量:18

Errosion Test on 500kV Composite Rod Insulator Fractured in Service and Its Electric Stress Estimation
下载PDF
导出
摘要 应用有限元数值计算方法,依据实际运行中的工况,对运行环境相近的两种典型结构500kV棒形悬式复合绝缘子,进行了电场和电位分布计算。得出受杆塔和高压导线分布电容的影响,绝缘子导线侧和接地侧的电场畸变严重;导线侧和接地侧的电场强度均高出绝缘子中部十几倍,电场分布极不均匀。结合运行实际,对复合绝缘子及伞套材料的耐漏电起痕和耐电蚀损性进行了试验。发现500kV棒形悬式复合绝缘子断裂掉线原因是硅橡胶伞套蚀损,内部芯棒暴露后经电晕烧蚀,进而水解引起脆断;复合绝缘子出现的电蚀老化,外部因素主要是电场分布不均匀和大气污湿,本体因素是伞套材料的耐漏电起痕及电蚀损性能较低。 Electrical field and stress distribution calculation was made on two typical 500kV rod composite string insulators with similar working conditions using limited element processing. The results shows severe field distortion at conductor and earthing top of insulator which stress is in more than 10 times higher than at central part due to effect of distributed capacitance of H.V. conductor and tower,Tracking and erosion test on insulators and shed material was made under service condition.The cause of insulator fracture is found to be attributed to shed erosion which lead to core exposure, corona burning, hydrolysis and brittle fracture, The erosion and ageing of composite insulator is attributed to nonuniform electric stress and atmospheric contamination as external conditions, and low tracking-errosion resistance of shed material。
出处 《电瓷避雷器》 CAS 2005年第4期1-7,共7页 Insulators and Surge Arresters
关键词 500kV棒形悬式复合绝缘子 蚀损试验 电场计算 500kV rod composite string insulator errosion test electric stress estimation
  • 相关文献

参考文献1

共引文献7

同被引文献158

引证文献18

二级引证文献162

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部