合并单元传变特性异常引起主变差动误动分析  

Analysis of Differential Misoperation of Main Transformer Caused by Abnormal Transmission Characteristics of Merged Units

作　　者：张浩 詹逸宝 ZHANG Hao;ZHAN Yibao

机构地区：[1]国网湖北省电力有限公司电力调度控制中心,湖北武汉430072 [2]国能长源汉川发电有限公司,湖北汉川431614

出　　处：《电力系统装备》2024年第11期95-98,共4页Electric Power System Equipment

摘　　要：文章从智能变电站10 kV线路故障时因主变低压侧合并单元传变特性异常造成的主变误动跳闸事件入手,介绍了事件经过、保护动作情况,利用故障时波形采样数据,从差流计算、动作判据入手,对主变差动保护异常动作原因展开了分析,探讨了本次合并单元传变特性相位异常表现形式及其成因,提出了相应的防范措施及建议。The article starts with the misoperation and tripping event of the main transformer caused by abnormal transmission characteristics of the low-voltage side merging unit during a 10 kV line fault in an intelligent substation.It elaborates on the event process and protection action analysis.Using waveform sampling data during the fault,starting from differential current calculation and action criteria,the article analyzes the reasons for the abnormal action of the main transformer differential protection.Explored the manifestation and causes of phase anomalies in the transmission characteristics of the merged unit,and proposed corresponding preventive measures and suggestions to reduce the risk of misoperation caused by such faults.

关 键 词：合并单元 传变特性异常 主变差动 误动 

分 类 号：TM452[电气工程—电器]