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In order to ensure the debugging safety and efficiency of the dc system of the emu, a current detection protection device needs to be designed to carry out quantitative analysis of the current signal collected on the circuit of the switchboard, complete the short circuit and overload protection of the switchboard, and realize data storage and transmission.In view of the characteristics of multi-channel and continuity of power distribution panel of emu, the overall system architecture design is completed, the IIC bus expansion design and IIC bus I/O extension design are completed on the hardware circuit, the number of sampling channels is increased, and the problem of insufficient transmission rate of multi-channel large data volume is solved.The detection and protection of bidirectional current signal are studied.The design of the display interface is completed, and the experimental data are analyzed and studied. The field experiment in this paper provides a preliminary exploration and a useful reference for the testing and testing of the general distribution panel.