摘要
电流互感器在饱和条件下会影响测量和保护装置的正常工作,文中通过一起变压器保护在出线故障时跳闸事件的深入研究,根据故障电流值、现场保护整定值、电流互感器及其二次回路检测数据,分析了电流互感器的结构原理、饱和过程及其对保护装置的影响。研究表明主变低后备保护越级跳闸是由电流互感器饱和导致线路保护拒动造成,且为预防此类事故提出了相应的对策措施。
The current transformer（TA） may influence the normal operation of measurement and protection devices. In this paper, a transformer protection tripping accident after a fault occurred in the outing line is taken as an example. According to the fault current data, the protection setting data, the TA secondary circuit testing data and the principle and saturation process of CT, their impacts on the protection devices are studied. The analysis shows that the action resistance of the line protection and transformer protection are caused by TA saturation. Therefore, the corresponding countermeasures for this kind of accident are proposed in the paper.
出处
《江苏电机工程》
2016年第4期84-86,共3页
Jiangsu Electrical Engineering
关键词
电流互感器
饱和
保护拒动
current transformer
saturation
protective action resistance
