The optimization method to improve the protection performance of the traditional Smart Substation has been studied in this paper,which is based on the characteristics of information shared in the intelligent substation.The meaning and scope of the station protection was expounded,and the total station differential region was divided into the boundary differential region and the element differential region.In the SPBD protection algorithm,a new differential priority was introduced and then a new method of differential protection based on current inrush variable has been proposed.It can realize the accurate and fast location of fault components.Also in terms of tripping strategy,the accidental case in which the breaker refuse to act was taken full consideration.The resolution given in this paper uses a new tripping strategy called extended tripping,which will obviously improve the fault-tolerant ability of the backup protection strategy.PSCAD simulation results show that the proposed method is with high accuracy and feasibility.
intelligent substationsubstation-area backup protectioncomplete digital relayscurrent differential principle
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