一种小电流接地系统单相接地故障测距新方法

提出了一种基于广域同步信息的故障测距新方法，该方法基于线路的分布参数模型，利用横向故障电流与故障距离的关系构造了一个测距函数，利用线路两端的电压、电流同步信息，同时每假设一个故障点距离就可求出与之对应的横向故障电流值，在整条线路上利用迭代搜索的方法可求出唯一的一个最大横向故障电流，该电流的对应距离即为实际故障距离。大量仿真结果和现场试验均表明此方法具有较高的可靠性和测距精度，并且可以推广到其他类型的故障测距计算。

A New Fault Location Method for Single Phase to Ground Faults in the Small Current Neutral Grounding System

A new fault location method for single phase to ground faults is proposed based on the wide-area synchronizing information.The method is based on the line model of distributed parameters in the small current neutral grounding system,and establishes a fault location function according to the relationships between the fault current and fault distance,which requires synchronized samples of currents and voltages from the two ends of a line.With each assumed fault distance,a corresponding fault current can be ob...