小电流是一个专业名词，比较有行业性。 小电流在行业内是小电流接地选线装置的简称，该设备适用于3KV－66KV中性点不接地或中性点经电阻、消弧线圈接地系统的单相接地选线，用于电力系统的变电站、发电厂、水电站及化工、采油、冶金、煤炭、铁路等大型厂矿企业的供电系统，能够迅速可靠地指示出发生单相接地故障的线路。
Small current is a professional term, more industry-oriented. Small current is the abbreviation of small current grounding line selection device in the industry. This equipment is suitable for single-phase grounding line selection of 3KV-66KV neutral point non-grounding or neutral point grounding system through resistance and arc suppression coil. It is used in substations, power plants, hydropower stations, chemical, oil extraction, metallurgy, coal, railway and other large-scale factories and mining enterprises of power system. The power supply system of the industry can quickly and reliably indicate the line where single-phase grounding fault occurs.