基于网络拓扑分层约简的接地网腐蚀故障诊断

为了更有效地利用接地网故障诊断结果，提出了一种基于网络拓扑变换的接地网分层约简方法。将接地网分为准元版块、元版块、元网络、可及接地网和本征接地网等层次。将支路分为明晰和不确定两类，明晰支路的电阻可以唯一确定，而不确定支路的电阻不能准确获得。提出了支路明晰与不确定的判别方法，论述了一种从本征接地网开始，逐层上溯确定各个层次的明晰支路电阻的方法。建议了一种确定不确定支路电阻最优解和可能取值范围的方法。以一个60支路的实验接地网为例进行了验证，故障诊断结果表明提出方法的正确性和可行性。

Grounding Grids Corrosion Diagnosis Based on Hierarchical Simplification of Network Topology

To utilize the results of grounding grid corrosion diagnosis effectively, a novel hierarchical simplification model of grounding grids is presented. A grounding grid is divided into several layers such as quasi-circuit-block, circuit-block, block-network, accessible grounding grid and intrinsic grounding grid. All branches are classified into two kinds, which are defined as clear-branch and uncertain-branch, respectively. The resistance of clear-branches can be determined while the resistance of uncertain-branches can't be exactly known. The method of distinguishing clear-branch and uncertain-branch is proposed. A novel approach is presented to calculate the resistance of clear-branches by tracing from the intrinsic grounding grid to the upper layers. A methodology to determine the optimum solutions and the probable resistance ranges of uncertain-branches is suggested. An experimental grounding grid with sixty branches is used as an example. The results of corrosion diagnosis show that the proposed approaches are correct and feasible.