某核电厂主泵电机差动保护异常跳闸及改进措施  

Abnormal Tripping and Improvement Measures of Differential Protection for the Main Pump Motor of a Nuclear Power Plant

作　　者：段野[1] Duan Ye(Jiangsu Nuclear Power Co.,Ltd,Lianyungang 222042,China)

机构地区：[1]江苏核电有限公司,连云港222042

出　　处：《智能建筑电气技术》2023年第4期67-70,共4页Electrical Technology of Intelligent Buildings

摘　　要：本文结合田湾核电站3#、4#机组调试期间主泵电机保护异常跳闸现象,对故障原因进行了深入分析,发现由于主泵电机固有特性,其在启动过程中断路器侧和中性点侧电流存在很大相角差,造成差动保护回路中有较大的不平衡电流产生,从而导致了差动保护的误动作,并基于此故障原因,得出解决办法进行改进。In combination with the abnormal tripping of the main pump motor protection during the commissioning of Tianwan Nuclear Power Plant Units 3 and 4,this paper makes a thorough analysis of the causes of the fault and obtains the causes and solutions.Due to the inherent characteristics of the main pump motor,there is a large phase angle difference between the current at the circuit breaker side and the current at the neutral point side during the starting process,which reflects that there is a large unbalanced current in the differential protection circuit,leading to the misoperation of the differential protection.

关 键 词：异常跳闸 差动保护 差动启动定值 变比修正 不平衡电流 

分 类 号：TM726[电气工程—电力系统及自动化]