B-样条小波对输电线路的故障定位

Fault positioning on transmission line with B-spline wavelet

给出B-样条小波函数的构造数学模型、实现算法及三相输电线路解耦方法.利用3次B-样条小波变换程序分别对输电线路不同点短路的故障数据进行多分辨分解;提取输电线路故障暂态信息中的行波特征,获得故障发生的准确时间,计算出故障点距测试端的距离.验证B-样条小波函数具有非常好的局部特性,且函数形式简单.

A constitutive mathematical, model of B-spline wavelet function, its implementing approach, and the decoupling method of three-phase transmission line were given. By using the program of third-order B-spline wavelet transform, the short-circuit fault data at different locations on the transmission line were decomposed with multiple resolution, the feature of travelling were in the transient information on the fault of the transmission line was extracted the exact time of fault occurrence was obtained, and the distance of fault location from the measurement terminal was figured out. It was tested and verified that the B-spline wavelet function possessed very fine local feature and simple form, that could be implemented with respect to its software and hardware as well.