基于正则化最小二乘法的接地网腐蚀状态评估方法

Corrosion State Assessment Method of Grounding Grid Based on Regularized Least Square Method

针对接地网腐蚀故障不易排查的问题,基于电网络理论,建立关于接地网端口电阻与腐蚀导体支路电阻的腐蚀评估方程,采用正则化最小二乘法,解决了方程求解中欠定和不适定的问题.通过比较了接地网导体支路电阻与腐蚀程度的关系,制定了腐蚀程度评估标准.对不同类型可及节点条件下接地网端口电阻进行仿真计算,提出了测量节点选取原则,解决了节点盲目选择情况下的误诊问题.通过仿真计算和模拟腐蚀试验,证明了正则化最小二乘法、腐蚀程度评估标准和测量节点选取原则对接地网腐蚀状态评估是可行的.

Aiming at the problem that the corrosion failure of grounding grid was difficult to troubleshoot,based on the electrical network theory,a corrosion evaluation equation for grounding grid port resistance and corroded conductor branch resistance was established,and the regularized least square method was used to solve the problem of underdetermined and ill-posed equations.By comparing the relationship between grounding grid conductor branch resistance and corrosion degree,a corrosion degree evaluation criterion was developed.The grounding grid port resistance was simulated and calculated under the condition of different accessible node types,and the principle of measurement node selection was proposed to solve the problem of misdiagnosis in the case of nodes blind selection.Through simulation calculation and simulated corrosion test,it was proved that regularized least square method,evaluation standard of corrosion degree and selection principle of measurement nodes were feasible in the corrosion state evaluation of grounding grid.