宜宾±800kV换流站接地极线路断线故障分析

摘要

介绍了宾金直流输电线路金华换流站极Ⅱ±800kV直流穿墙套管发生故障后,接地极线路断线故障过程.采用EMTP-ATP软件对故障前后系统电流为5970 A和5215 A时接地极导线和避雷线分流情况进行了仿真计算,并与录波图进行了比较.根据计算结果分析了绝缘子掉串及导线断线原因,以及避雷线熔断原因.提出了接地极线路绝缘配置建议.%After fault occurred on ±800 kV DC wall bushing of pole Ⅱ in Jinhua converter station,the grounding line also has breakage fault.By using ATP-EMTP,response of grounding electrode conductor and shielding wire is simulated with 5 970 A and 5 215 A fault current.The results are compared with recorded fault waveform.According to calculation results,the breakage reasons of insulator string and shielding wire are analyzed in detail.The recommended grounding line insulation configuration is also introduced.