It extracts the busbar transient voltage signal using the multi-resolution morphological gradient of the mathematic morphological , the differential spectrum energy of voltage can b.

• 利用数学形态学的多分辨形态学梯度提取故障相母线电压信号的暂态分量,通过比较故障相母线电压谱能量的差异来判别瞬时性与永久性故障。