可调节消弧线圈接地系统单相接地故障选线

故障选线问题一直困扰着消弧线圈接地系统。在分析消弧线圈接地系统故障线路和非故障线路的零序导纳与消弧线圈导纳关系基础上，利用新型消弧线圈的在线可调节特性，根据消弧线圈调节前、后系统的状态量，提出线路b参数的计算方法，根据b参数值的相对大小来判断故障线路和非故障线路．从分析过程中可知，无论系统发生金属性接地或是经电阻接地，利用线路b参数值的相对大小都可以准确地判别出故障线路。该选线算法经仿真验证正确，并用于实际系统．从2年多的实际运行可以得出结论，介绍的选线方法具有较高的可靠性．

Fault Line Selection for the Distribution System with the Adjustable Arc Suppression Coil

The problem of the faulty line selection with the arc suppression coil(ASC) has existed for a long time.On the basis of analyzing the relationships between the ASC admittance and the admittances of lines,including the faulty line and non-faulty lines,the calculation of the b parameter is presented,in which the state of the ASC is changed during the single-ground existing for the faulty line selection by adjusting its inductance.The value of b for the faulty line is much greater than that for non-faulty lines in both the direct ground and the ground with the resistance.The proposed method is verified with the simulation and is applied to the projection.It is proven that the proposed method is with the high reliability.