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    Abstract: At present, the processing methods of voltage parallel and switching functions of process layer devices in substations are complex and inefficient, and it has the limitation of relying too much on CPU processing performance. On this basis, this paper puts forward an optimal design method of voltage parallel and switch, which can give full play to the ability of field programmable gate array(FPGA) resources,effectively reduce the workload of CPU, not only propose a binary logic judgment method, but also simplify the interaction process between CPU and FPGA, and improve the timeliness and stability of sampled values (SV) sending messages. Finally, by contrast verification on the acquisition execution unit device, the results shows that the optimized design method meets the functional requirements, the whole processing process is real-time and reliable, and the CPU running load and the message dispersion value sent by SV are effectively reduced,the improved design method is feasible in practical application.

    Key words: voltage parallel; voltage switch; sampled values; functional design