摘要
分析了2007年4月29日科技园变空投变压器时,主变差动保护误动作过程。得出主变差动保护误动作主要是空投变压器产生的二次谐波占基波比例小于定值中的制动系数(0.17),导致A、B相闭锁条件开放,差动出口跳闸。根据误动原因提出应采用波形对称原理的保护装置。
This paper introduces the situation of the differential protection maloperation for no-load transformer in Science and Technology Parks power substation on April 29, 2007. A conclusion has reached that the main reason for differential protection malopcration of main transformer is mainly due to malfunction resulting from second-harmonic for no-load transformer of fundamental proportion accounted for less than the fixed value of the braking coeflqcient （0.17）, leading to open the locking conditions for phase A and B, and differential export trip. Protect equipment is suggested which using wavcform symmetry principle according to the maloperation.
出处
《电网与清洁能源》
2010年第2期33-35,共3页
Power System and Clean Energy
关键词
变压器
励磁涌流
差动保护
transformer
magnetizing inrush current
differential protection
