基于B样条导数小波变换的TA饱和实时监测

On-line monitoring of TA saturation based on B-splines derivative wavelets transformation

针对瞬时值电流差动微机母线保护中出现的电流互感器(TA)饱和的问题,提出了一种实时开放饱和TA线性区域的方法。利用一种在许多方面都优于其他小波的B样条导数小波(简称Bd小波)对TA饱和的电磁暂态仿真程序(ATP)仿真波形进行了分析。从仿真结果看,该法可较快地实现在TA饱和时的闭锁母线保护,退出饱和后开放母线保护。

In order to solving the existing TA (current transformer) saturation problem in current instantaneous-value differential microcomputer-based busbar protection, this paper proposes a real-time method to open linear region of saturated TA. By using B-splines derivative wavelets (Bd wavelet in short) transformation, ATP (the alternative transients program) simulating waveforms of TA saturation are analyzed. Simulation results show that the method can block busbar protection when TA saturated and open busbar protection after TA saturated more quickly.