摘要
为了解决变压器差动保护由于励磁涌流而经常误动作的问题,从变压器电磁特性出发,先阐述了利用磁通特性原理区分励磁涌流的不足,然后提出了利用电源侧电压和电流微分的比值来判别变压器是否含有励磁涌流的方法,此方法原理简单,易于实现,无需任何先验参数,具有数据采样方便,计算量小,动作可靠、迅速等特点。用该方法对变压器各种运行状态进行了仿真测试,测试结果表明该方法能够迅速、可靠地识别变压器内部故障。
In order to resolve the mal-operation in differential protection causing by magnetizing inrush, the shortcoming of magnetic flux characteristics principle is introduced. A new method for distinguishing magnetizing inrush based on the ratio of voltage and fluxional differential current is proposed. The advantages of the method are convenient data acquisition, easy implementation, no need of anticipated internal parameters, quick calculation and operation. The simulation results confirmed that the method is able to identify the internal fault reliably and quickly.
出处
《华北电力大学学报（自然科学版）》
CAS
北大核心
2003年第6期11-16,共6页
Journal of North China Electric Power University：Natural Science Edition
关键词
电力变压器
差动保护
励磁涌流
电力系统
仿真
power transformer
magnetizing inrush
internal fault
differential protection
