一起特高压换流站换流变进线CVT故障的分析与处理

随着特高压快速发展,特高压换流站、变电站的大量建设投产,对工程前期建设阶段、设备安装验收阶段等各个环节提出了更高的要求。文章通过对某换流站一起换流变进线PT故障的跳闸进行分析,通过对故障PT进行外观检查、电气试验、解体分析及故障录波分析,认为二次回路绝缘接地导致PT谐振是本次故障的直接原因,针对此次故障提出了相应的预防措施及建议,以提高特高压换流站的运行可靠性。

With the rapid development of UHV,a large number of UHV converter stations and substations have been put into production,which puts forward higher requirements for the early construction stage of the project,the stage of equipment installation and acceptance and other links.In this paper,through the analysis of the tripping of the PT fault of the converter-transformer inlet line in a converter station,and through the appearance inspection,electrical test,disintegration analysis and fault recording analysis of the fault PT,it is considered that the PT resonance caused by the insulation grounding of the secondary circuit is the direct cause of the fault,and the corresponding preventive measures and suggestions are put forward to improve the operation reliability of the UHV converter station.