Centralized substation backup protection with high reliability

Due to the fact that wide area information is easily disturbed, lost and distorted, while it is not fully considered in current wide area protection principle, a wide area backup protection algorithm with high fault-tolerance performance is proposed to implement the CSBPS (Centralized Substation Backup Protection System). After the fault-tolerance judgment. The CSBPS can locate the fault equipment according to the fault direction information and fault distance information which is calculated by currents and voltages measured from the electric equipments of local substation and collected from the adjacent substations. The results of case study show that CSBPS can't make the uncorrected judgment even when any one of the protection element operates incorrectly, fails to operate or its fault information lost. The proposed algorithm is simple and reliable with good fault-tolerance capability.