结合波形后半波2-范数平均标准差鉴别变压器励磁涌流新方法  

A new method for discriminating transformer inrush current by combining the average standard deviation of 2-norm of the wave

作　　者：张凯[1] 董华英[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003

出　　处：《华北电力大学学报（自然科学版）》2013年第3期36-42,共7页Journal of North China Electric Power University：Natural Science Edition

摘　　要：在大量仿真和实验的基础上,综合变压器励磁涌流和内部故障电流的特点,提出了一种鉴别变压器励磁涌流的新方法。该方法基于励磁涌流偏于时间轴一侧和故障电流接近正弦波的特点,以周波内最值差别和归一化面积作为综合判据鉴别非对称的励磁涌流,而对于对称的励磁涌流,以后半周波内一部分数据与同窗长的标准正弦波的2-范数的平均标准差作为判据进行鉴别。仿真和实验验证了方法的正确性。A new method for discriminating the inrush current by integrating the characteristics of the two kinds of cur- rent is presented based on large of simulation and testing. Because of the character that the magnetic inrush current leans to the one side of the time axis and the internal fault current is similar to the sine wave, the difference between the maximum and minimum and the unitary area in cycle is used as a general criterion to discriminate the unsymmetri- cal inrush current. For the symmetrical inrush current, we set a second criterion, which needs to calculate the aver- age standard deviation of the 2-norm between the part data in the half cycle and the sine wave with the same length, va- lidity of the new method is verified with simulating and testing.

关 键 词：励磁涌流 最值差别 归一化面积 2-范数 平均标准差 

分 类 号：TM343[电气工程—电机]