In order to achieve the dual-carbon goal of incorporating a high proportion of new energy into the power system, it is necessary to focus on the contingent and volatile distributed new energy access substation, which operates in parallel with the 10kV low-voltage distribution network. This can result in complex and diverse system component parameters, which can lead to electromagnetic voltage transformer (PT) resonance parameter matching and cause ferromagnetic resonance overvoltage under certain transient conditions. Therefore, a study on the ferromagnetic resonance overvoltage of PT in low-voltage distribution networks in substations and the inhibition measures is necessary. This paper clarifies the mechanism of ferromagnetic resonant overvoltage in PT and constructs a resonant overvoltage model using PSCAD-EMTDC electromagnetic simulation software after connecting new energy power supply to LV distribution network. The characteristics of ferromagnetic resonant overvoltage caused by ground fault are analyzed, and different elimination strategies are simulated to achieve optimal suppression of ferromagnetic resonant overvoltage.