“…In Fig. 3, A,B,C,D refer to the power source or end load of the distribution network [14], where, A,C is the main trunk line; a,b represents the cross node of the branch line and the trunk line, and the detection device is installed at the nodes [15].Then, fault interval points are calculated. The above three points constitute the maximum fault interval, and the thick dotted line is the potential fault interval [16,17].…”