The self-extinguishing of the arc caused by a single-phase grounding fault depends mainly on the amplitude of the residual current at grounding point.
可自恢复性单相接地故障点的电弧是否能自然熄灭的决定因素是接地故障残流的大小。
By the use of the microcomputer system of V40 on chip microprocessor, PI and vector calculations are carried out through soft ware with fast speed, low fault point and quick response to current.
采用V40单板机微机系统，PI运算及矢量运算均用软件程序实现，运算速度快，故障率小，电流响应快。
Sag state estimation observability analysis is modeled and correlative modification method is proposed from the point of fault current superimposing firstly.
基于故障电流叠加原理，构造了电压跌落状态估计可观性分析的数学模型，合理地解决了部分故障路段不可观的问题。
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