Abstract: Fictitious Circuits——a new concept is presented for analyzing large-scale networks by tearing. The concept unifies branch tearing, node tearing and hybrid tea ring, i. e. the concept is more general and includes all the previous tearing as special ca ses. Based on fictitious circuits, the tearing equations of Bordered Brock Diagonal form can be founded conveniently and directly. The method presented in this paper is usable for the solution of large-scale networks by any kind of tearing.

Key words: solution of large-scale networks, fictitious circuits, analysis by tearing