A Method of Identifying Shift Switch of Expected Failure Isolation

After setting expected failure during power grid operation risk assessment, failure isolation contains two steps, one is to identify the switches that should be disconnected, which are called shift switches, the other is to disconnect the shift switches. This paper proposes a method of identifying shift switch of expected failure isolation, where substation topology and complex wiring are considered. First, from the viewpoint of failure isolating effect, failure elements are classified into independent elements and element groups. Second, element group and its composition are obtained according to its structural features. Then, the method of identifying shift switches of failure isolations for all kinds of failure elements is established. Finally, the proposed method is validated by applying it to classical failures of a practical power grid.