A New Scheme of Substation Backup Protection Based on Topology Matrixes and Differential Zones

It is easy to access electrical information of the all substation in intelligent substation, a backup protection scheme based on topology matrixes and differential zones is proposed. Firstly, topology matrix based on circuit breaker association and the differential zone is defined. Secondly, the action scheme of the differential zone is designed, and tripping matrix is formed. When a fault occurs in the substation, selective fault isolation can be managed through coordination and cooperation of each differential zone. The result of fault case analysis of actual substation shows that this scheme solves the problem of long time-limit of traditional staged backup protection and effectively improves backup protection performance, which is simple, flexible and reliable.