一起220kV线路瓷绝缘子耐张串断裂故障分析

Analysis on a Fracture Fault of Porcelain Insulator Tension String in 220kV Transmission Line

对发生于某220 kV输电线路的瓷绝缘子耐张串断裂故障进行分析。结合断裂绝缘子串的形貌特征检查、内部结构DR透视分析、铁帽质量分析、绝缘子的力学性能及绝缘性能测试等研究,明确了瓷绝缘子铁帽铸造质量差、存在严重的冷隔缺陷是造成本次瓷绝缘子耐张串断裂故障发生的主要原因。并对预防该类型故障的发生提出了相应的防范措施。

The fracture fault of tension porcelain insulator string occurred in a 220 kV transmission line is analyzed. Combined with the morphological characteristics inspection of the broken insulator string,DR perspective analysis of the internal structure,mechanical and insulation performance test of the insulator and quality analysis of the iron cap have been made. It is clear that the poor casting quality of the porcelain insulator cap and the existence of serious cold insulation defects are the main reasons for the fracture of the tension porcelain insulator string. The corresponding preventive measures are put forward to prevent the occurrence of this type of fault.