一种不受CT饱和影响的非同步故障测距新方法

A novel unsynchronized fault location method without the effect of current transformers saturation

双端量法故障测距中通常会采用双端电压和电流数据,其中电流量容易受CT饱和影响而影响测距的准确性。为了消除该影响,文章提出一种不需要采用电流量计算的故障测距新方法。新方法仅需用电压量计算,在原理上不受CT饱和影响。采用序分量法构造了关于故障距离的方程,在原理上消去了非同步角,不需要双端数据同步。仿真计算表明提出的新方法具有较高的测距精度,不易受非同步角和过渡电阻的影响,具有良好的工程应用价值。

Two-end voltage and current data usually adapt in the two-end fault location method,however,the current data is easily affected by CT saturation,and thus affect the accuracy of fault location. In order to eliminate this effect,this paper proposes a new method for fault location without the use of current. The new method only uses voltage without affecting by CT saturation theoretically. The sequence component is used to construct the equation about the fault distance,which can eliminate the non-synchronous angle without Two-End data synchronization in principle. The simulation results show that the proposed new method has high precision of fault location and good engineering value without the effect of non-ynchronous angle and transition resistance.