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Research and Analysis of Small Current Grounding Line Selection System

In the small current grounding system, because the short-circuit fault of single-phase grounding accounts for more than 80% of the total short-circuit fault, the selection of single-phase grounding fault line is still the main problem in electrical engineering. This paper studies the principles, advantages and disadvantages of various line selection technical methods in case of single-phase grounding fault, and puts forward the improved method of comprehensive line selection for the problem of misjudgment of fault line selection. On this basis, it puts forward the improved method of comprehensive line selection, verifies the line selection device of 10kV transmission line through the relevant data obtained from design calculation and simulation experiment, and puts forward a more reasonable design scheme for the hardware circuit and software circuit of the line selection device, The fault tolerance and accuracy of small current grounding line selection system are improved.