中文摘要：

传统消弧线圈对小电流接地短路电流的补偿为工频无功分量补偿，且采用过补偿方式．补偿后接地点残流较大，易造成消弧失败。为实现单相接地全故障电流补偿，提出一种全故障电流的计算方法。分析了单相接地故障电流的特征，利用等值r电路对配电线路建模，形成单相接地故障零模网络，推导出接地故障电流同系统中性点零模电压的关系，从而利用差分方程迭代计算出全故障短路电流。该方法具有原理清晰、采样简单、计算准确迅速、无需故障选线等优点，为实现全故障电流补偿提供了精确的依据。RTDS仿真验证了全故障电流计算方法的准确性和有效性。

英文摘要：

Only the power frequency component of fault current can be compensated off by traditional arc suppression coil when single-phase grounding fault happens in non-solidly grounded system. Usually, it takes overcompensation, leading to a large compensation residual grounding current. This will easily cause failure arc-extinguishing. To realize the full compensation of grounding current,a full fault current calculation method is proposed. Here r equivalent cir- cuit is selected to model distribution lines after the analysis of single-phase-grounding fault current feature, form zero modal network of single-phase-grounding fault,and then deduce the relationship between the grounding fault current and zero mode voltage of neutral point. Then the full fault current can be calculated iterately by solving the differenti- al equations. This method has advantages of discernible principle, rapid and accurate calculation, using less electrical quantities and no fault line selection. It provides an accurate basis for full fault current compensation. Simulations verified the accuracy and validity of full fault current calculation method.