Fault arc detection method and device

The invention discloses a fault arc detection method and device, and the method comprises the steps: setting two sensing schemes with different frequency response characteristics as a control group, enabling a fundamental current to occupy a main component when a line is normal, enabling the control group to be high in output correlation, and enabling the fundamental current to occupy a main component after a fault arc occurs in the line due to the large change of a high-frequency component in the line, the output correlation of the two control groups is weakened, and the mutual difference is used as the main characteristic of the fault arc. According to the invention, the problem of misjudgment caused by load starting and mode switching during fault arc judgment based on sudden change of front and back current periods can be solved. 本发明公开了一种故障电弧检测方法及装置，通过设置两种频率响应特性不同的传感方案互为对照组，在线路正常时，基波电流占主要成分，该对照组的输出相关性强，但在线路中发生故障电弧后，由于线路中高频成分发生较大变化，两对照组的输出相关性减弱，本发明通过这种互为差异作为故障电弧的主要特征。本发明能够解决基于前后电流周期突变进行故障电弧判定易受负载启动、模式切换而形成