一种补充可及节点的接地网腐蚀故障诊断改进方法

An Improved Approach of Grounding Grid Corrosion Diagnosis by Adding Touchable Nodes

为了使接地网腐蚀故障诊断得到的电阻可能取值范围较宽的不确定支路转化为电阻可以唯一确定的明晰支路,提出一种对接地网局部进行选择性的少量开挖,暴露一些不可及节点使之成为可及节点,再补充相应的测试后重新进行故障诊断的方法。论述了测试方案集合的充分性判断和所提出方法的基本步骤。提出了一种基于遗传算法确定需要补充可及节点位置的优化过程,其目标函数是使补充的可及节点数量最少。论述了染色体编码方法和能避免不可行解的初始种群生成方法、交叉方法和变异方法。采用提出的方法对一个60支路的实验接地网进行了验证,结果表明提出的方法是可行的。

To convert the uncertain branches with wide possible resistance ranges into clear branches with determined resistances, an improved approach is presented by digging and converting a few untouchable nodes into touchable nodes, and supplementing the corresponding tests . The completeness of test and the performing steps of the proposed approach are described. A genetic algorithm based method to determine the position of digging and adding touchable nodes is proposed, taking the minimum number of needed digging spots as its objective function. The coding of chromosomes is described. The ways to avoid the unfeasible solutions in the processes of initial population forming, crossover and mutation operations are discussed. The experiment on a grounding grid with sixty branches verifies the feasibility of the present approach.