The Research Of Single Phase To Ground Fault Diagnose Based On Multi Transient Information Fusion In Distribution Power Grid

In China, small grounded current system are commonly used in distribution network currently. What’s more, in distribution network, the single-phase to ground fault occupies nearly eighty percent of all the faults. One of single-phase to ground fault is that the transient information sequence is quite obvious and the steady information sequence is quite small. Based on the above, zero sequence current has much transient information, which is the fundament to select the fault line of single-phase to ground fault line. What’s more important is the fusion of different types of fault transient information to ensure the correctness of the fault line selection. This paper focuses on the situation of single-phase to ground fault and discusses in details about the fault. To supple the theory fundament, this paper the transient and steady process of this fault.To analyze the advantages and disadvantages of different line selection methods, this paper applies the different transient information and the simulation wave to confirm the results. This paper builds the models of different types of single-phase to ground faults. The MATLAB/Simulink is chosen as the simulation platform. What’s more, this paper attempts to design the hardware of the line selection devices.Finally, the device of single phase to ground fault diagnose based on the fusion of transient information is applied into real project, with high steady operation and easy function.