当采用两相电流差接线方式时，保护范围与短路类型和短路相别有关。
The protect range is relational to short circuit type and phase when phase differential current connection mode is adopted.
基于对异相短路的分析，发现两相电流故障分量波形呈现反向对称性，可利用相关分析法快速提取此特征。
The waveforms of the current fault component of two phases are symmetrical according to an analysis of wrong-phase-coupling. This characteristic can be quickly extracted by correlation analysis.
并采用广义积分器原理实现对三相电流在两相静止坐标下的控制，实现了正负序电流的无静差跟踪控制。
Generalized integrator was used to realize static error free tracking control of positive and negative sequence current under two-phase static coordinate.
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