Abstract: This paper investigates the automatic switchover (ATS) scheme of the auxiliary power supply system in a ±500 kV converter station. The wiring mode and operating logic of the 10 kV ATS are analyzed, focusing on potential logic defects. Aiming at ATS misoperation caused by improper delay settings during reclosing, a three-phase voltage sampling reconstruction and corresponding logic optimization method are presented. Timing verification shows that the proposed scheme can effectively avoid maloperation during reclosing and enhance the long-term operation stability of the converter station.