小电流系统单相接地的特点 The characteristic of single phase ground of small current system 1. 选线装置实时采集系统故障信号，应用多种选线方法进行综合选线，具体包括：智能群体比幅比相法、谐波比幅比相法、小波法、首半波法、有功分量法、能量法、零序电流突变量法。 1. The line selection device real-time fault signal acquisition system, a variety of line selection method is applied to synthetically line selection, specific include: intelligent group than picture than phase method, harmonic amplitude phase method, the wavelet method, the first half wave method, active component method, energy method, method of zero sequence current mutation. 2. 装置具有故障录波功能，可以提供故障前后的波形，包括故障发生前的一个周期和故障发生后五个周期的波形。可保存现场故障录波数据和选线结果20000次。 2. The device has the function of fault wave record, can provide before and after the fault waveform, including failure occurs before a cycle and failure after five cycles of waveform. Can save the field fault record wave data and the result of the selected line 20,000 times. 3. 装置具备跳闸功能，大容量触点可以直接接入跳闸回路，实现选线后的故障切除。也可与自动重合闸结合，实现选线后的自动消弧和进一步确认(可选功能)。 The device has the function of tripping, and the large capacity contact can be connected directly to the tripping circuit, which can be removed after the selection line. It can also be combined with auto reclosing to realize automatic arc suppression and further confirmation (optional feature) after selecting line.