Abstract: Although the electricity consumption information collection system can calculate the line loss rate of the substation area through power supply and sales data, it cannot achieve a deeper perception of the electricity consumption of electrical equipment and branches at all levels in the substation area. The refined control of line loss lacks necessary tools and means. The "running, emitting, dripping, and leaking" in the operating station area accounts for a large proportion. Taking corresponding measures to reduce substation losses can further improve the quality and efficiency of the power grid. By using fixed or mobile line loss monitoring tools, abnormal branches of line loss in low-voltage substation areas can be monitored. Obtain abnormal branch section line loss data. By implementing refined management and loss reduction measures for line loss, we aim to achieve precise management of abnormal line loss areas.