基于短时相关变换的变压器故障电流和励磁涌流的识别

Identifying Fault and Magnetizing Inrush Current in Transformer Based on Short-time Correlation Transformation

提出了一种鉴别内部故障电流和励磁涌流的新方法.一个短时相关函数被用来提取差动电流的间断角.考虑CT饱和对励磁涌流的影响,并用从动态电力系统样机中获得的数据检验,来证明本文所提出的方案的有效性.而且此算法的计算量很小,因此可用于实际应用中.

This paper proposes a new method for identifying internal fault current and inrush current.A short time correlation function is used to extract the dead angle from the differential current.Considering the impact of CT saturation on inrush current and the data verification from the prototype device on the dynamic power systemt,his paper ensure the effec-tiveness of the proposed scheme.The amount of calculation of the algorithm is very smallt,hus it can be applied in actual operation.