电流互感器局部暂态饱和识别的研究  

Research on Identification of Partial Transient Saturation in Currant Transformers

作　　者：毕大强[1] 冯存亮[2] 葛宝明[3] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系),北京市海淀区100084 [2]中科华核电技术研究院有限公司,广东省深圳市518124 [3]北京交通大学电气工程学院,北京市海淀区100044

出　　处：《中国电机工程学报》2012年第31期184-190,235,共7页Proceedings of the CSEE

基　　金：铁道部科技研究开发计划资助课题(2009J007-D)~~

摘　　要：针对外部故障切除、应涌流及恢复性涌流时电流互感器饱和容易引起差动保护误动的情况,分析电流互感器饱和时相对磁链变化的特点,并研究电流互感器在大剩磁或直流磁链积累的情况下传变小工频电流而出现相位偏移式饱和的识别方法。在假设一个电流互感器不饱和而用于差动保护的其他电流互感器传递发生相位偏移的情况下,根据电流差动特性判断差动电流是否位于判据启动区,从电流互感器相对磁链积累变化的角度出发,根据相对磁链积累的方差计算曲线,通过计算位于判据启动区内各时刻方差计算曲线拐点的个数实现了相位偏移式饱和的识别判据。动模实验和现场数据分析表明所提算法能够识别电流互感器的相位偏移式饱和,验证了其有效性。Saturation of real-operation of differential current transformer may cause protection during the period of fault removal, sympathetic inrush or recovery inrush. The paper analyzed the character of relative accumulation of flux linkage of current transformer, and proposed an algorithm to diagnose phase-shift saturation of current transformer while the current transformer transferred a small power frequency current under the condition that large remanent flux mad DC flux linkage accumulation was produced in current transformer. Assuming that one current transformer used for differential protection did not saturate and the other one saturated, the paper proposed an algorithm to diagnose phase-shift saturation of current transformer according to the characteristic of flux linkage accumulation. The variance of relative flux linkage accumulation and the number of inflexion point in the enabled zone was calculated. The dynamic experiments and field data verified that the algorithm had good performance in detecting phase-shift saturation of current transformer.

关 键 词：电流互感器 相位偏移式饱和 相对磁链积累 

分 类 号：TM77[电气工程—电力系统及自动化]