Abstract: In recent years, the proportion of cable lines in the transmission grid has increased. It may have impact on the resonance characteristics between the converter station and the transmission grid. In order to analyze the effect of the AC outlet mode of converter station on energizing the no-load converter transformer, the phenomenon of inrush current and ferromagnetic resonance is introduced, and different AC outlet modes with overhead lines and cables are established. Taking typical ± 500 kV DC project in China as an example, by means of the PSCAD/EMTDC, the influence of inrush current and ferromagnetic resonance caused by different outlet modes, the ratio of the cable in total lines and the closing resistance of the breaker are analyzed. Results show that different outlet modes have no significant effect on the inrush current, but the cable outlet mode is more likely to cause ferromagnetic resonance, and the higher the cable ratio is, the easier the ferromagnetic resonance occurs. Meanwhile, the suppression effect of closing resistance on inrush current and ferromagnetic resonance is verified.