故障开始阶段是AN相接地故障，随后发展成为ABN相间接地故障，就是发展性故障。
提出了适用于发展性故障的故障分量提取算法。
An extraction approach of fault superimposed components in an evolved fault is proposed.
发生发展性故障后，利用保护安装处的全电流减去求得的支路电流得到发展性故障后的故障分量电流。
After an evolved fault occurred, the fault superimposed components can be calculated through subtracting the solved load currents from the currents at the measuring point.
实现了稳态和动态过程的记录与统一分析，为分析大范围、长过程和发展性的故障提供了依据；
The uniform analysis technique of steady and dynamic data has been realized to ensure the analysis to wide area, long process and developing faults.
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