To solve the problem that a single power source substation cannot accurately perform potential transformer (PT) phase verification with an existing transmission line during commissioning

this paper proposes a remote phase verification system based on 5G and Beidou technologies.The proposed system comprises three parts:a Beidou satellite positioning system

a 5G based positioning system

and a local clock synchronization system.Utilizing the high precision positioning capabilities of 5G and Beidou

the overall system architecture is designed

along with a signal acquisition circuit and a phase synchronization and verification module.The phase verification module integrates both Beidou and 5G based positioning to achieve accurate phase alignment

while a local clock synchronization module is introduced to enhance robustness against environmental interference.Simulation results demonstrate that the proposed system effectively solves the phase verification challenge in single source substations.Moreover

it overcomes the traditional constraint that phase verification could only be performed when a dual circuit power supply is available during the energization process of newly built substations.