Based on the case of a single-phase ground fault protection failure in the power supply ring network of a certain project, through the calculation of capacitance current and the protection setting calculation, the reason for the failure of the protection is analyzed in depth, and further suggestions for protection settings are put forward. Finally, based on the above analysis and combined with the actual situation of the project, an in-depth discussion on the grounding method of the construction power ring network was carried out, and the direction of optimization and improvement was pointed out.

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