主动干扰技术在消弧线圈接地系统故障选线中的应用

摘要

针对中性点经消弧线圈接地系统提出一种无需额外信号注入装置的故障选线方法:当馈线发生单相接地故障时,通过控制消弧线圈所连接的电力电子开关短时投切阻尼电阻,从而产生频率成分丰富的扰动电流信号,通过在各出线中对扰动电流信号进行检测和分析实现故障选线.所提方法不需要额外的信号发生装置,对于高阻接地故障同样适用.理论分析、仿真分析和模拟实验都验证了该方法的有效性.%A faulty line detection method without additional signal injection device is proposed for arc suppression coil grounding system:when single-phase grounding fault occurs in a feeder,the damping resistor is switched for a short time by power electronic switches connected to arc suppression coil to generate a disturbance current signal with various frequency components,then the faulty line is selected by detecting and analyzing the disturbance current signal in lines.The proposed method requires no additional signal generating device and can be applied under high impedance fault.Theoretical analysis,simulative analysis and laboratory experiments all verify the effectiveness of the proposed method.