Abstract: Considering the operational condition and maintenance mode of an on-site protection device in a substation, a novel closed-loop test and equipment management intelligent platform is proposed. The proposed intelligent platform effectively avoids the tedious process of the traditional closed-loop test mode, and solves the equipment management problem of the on-site protection device. The platform includes three key aspects: an information acquisition and display method, a ring network communication criterion among on-site protection sub systems, and an intelligent implementation technology of an automatic test process. The proposed intelligent platform has been used in Ningxia Shizuishan Power Supply Company for a long time, with stable and reliable operation and remarkable effect. The application results show that the proposed platform ensures the quality of the closed-loop test of the on-site protection device, greatly reduces the workload of the operation and maintenance personnel, and effectively reduces the operational and maintenance cost.