Research on Technology for Local Protection Intelligent Maintenance

At present, due to the addition of new secondary equipment such as merging units and intelligent terminals in intelligent substation, the reliability of the system has been reduced, and the trip time of protection has been prolonged. With the promotion and application of local protection devices in the new generation of intelligent substations, The above problem is solved. But the traditional maintenance mode will face new challenges. Aiming at the shortcomings of operation-maintenance mode of the intelligent substations at this stage, considering the characteristics of unified interface standards, small size, replaced easily and protection information transmitted through private network of local protection devices. This paper puts forward a new maintenance mode with centralized device information viewing, intelligent fault diagnosis and status assessment and a new maintenance scheme with factory intelligent debugging + replacing fast maintenance, which will provide reference for the further promotion and application of local protection technology.