基于磁通控制消弧线圈的注入式选线新方法

提出了一种谐振注入式接地故障选线新方法,可用于谐振接地系统单相接地故障选线。该选线方法充分利用了基于磁通控制消弧线圈的运行特点以及谐振频率电流能够突出故障信息的特点,可注入较大幅值的谐振频率电流以增强故障信息。其原理是在接地故障发生前后分别通过消弧线圈二次侧的逆变器注入相同的谐振频率电流,对电力系统零序参数形成2次快照,采用比值法及增补判据对2次快照的电流值、电压值进行分析,判定不满足相关判据的回路为故障线路。理论研究及仿真证实,该方法可以在消弧线圈补偿的同时进行选线,可以有效地检测高、低阻接地故障。

Grounding fault line detection based on magnetic-flux controllable arc suppression coil using current injection technology

A novel approach of grounding fault sline detection is proposed for single-phase grounding fault of resonant grounding system.It takes full advantage of the magnetic-flux controllable arc suppression coil and the fault information in resonant current.The fault information can be amplified by injecting heavy current.It takes two snapshots of power network zero-sequence currents before and after grounding fault by injecting same resonant current.Proportion method and supplementary criterions are used to analyze and determine the fault line by comparing shot currents and voltages.Theoretic study and simulation show that the approach works well during compensation and effectively detects faults with high or low grounding resistance.