Conductor Corrosion Fault Detection & Identification For Grounding Grids

To benefit the fault detection and identification of conductor corrosion fault, a hierarchical simplified model of grounding grids is put forward. Minimum unit dividing is the key process of hierarchical simplification, which can be realized by the proposed algorithm. Branches are classified into clear branch and uncertain branch. A Monte-Carlo based testability evaluation approach is suggested. The resistances of clear branch can be directly determined by the optimum solution of non-linear least square approach. A set of uncertain branch related with each other is defined as an uncertain branch group. A novel method based on dichotomy to calculate the maximum and minimum resistances of uncertain branches is presented. An experimental grounding grid with sixty branches is used as an example showing that the proposed methods are feasible.