Traditional relay protection maintenance requires personnel to enter substations and conduct tests with dedicated equipment after power outages, resulting in significant time and cost consumption. To address this issue, a new generation remote verification technology for relay protection that can be implemented online is proposed. First, based on the mature master-slave station architecture of CSG, a secure and reliable technical framework is established from both communication and functional dimensions. Second, recording files are created or selected from a typical fault recording database at the master station and remotely transmitted to the protection devices via intelligent recorders, enabling the injection of electrical quantities. Subsequently, the protection devices employ a hook-based isolation mechanism to replay the recording data, triggering simulated protection logic. Additionally, smart protection devices conduct online virtual circuit simulation tests. Finally, the intelligent recorder collects relevant information, generates a verification report, and uploads it to the master station, thereby completing a closed-loop test of protection actions. Field application results demonstrate that the developed system can perform remote verification safely and efficiently, contributing to cost reduction and efficiency improvement in maintenance work.