After the SPG fault occurs, the transient signal includes plenty of fault characteristics. In latest years, the application of wavelets empowers us to be able to study the transient process.

• 而系统发生接地故障后，暂态信号中包含有丰富的故障特征，近年来发展起来的小波分析为我们研究暂态信号提供了条件。