Protection in distribution grid operation process is of great significance for reducing operators’ safety risk and ensuring stable operation of power system. Taking into account of protection issues during the operation in distribution grid, this paper investigates the risk warning and protection methods based on monitoring of operator movement trajectories. First, trajectory tracking and risk warning methods based on Beidou positioning in long-distance and large-range operations is proposed. Then, for complex working conditions such as substations and indoor environments, trajectory tracking based on UWB positioning and boundary risk detection based on improved YOLO v7, as well as violation behavior detection of operators are discussed. At last, effectiveness of the proposed method in comprehensive operation process of distribution grid is verified through experiments.