接地网故障诊断的数学模型

Mathematical Model for the Fault Diagnosis of Grounding Grid

接地网是变电站安全运行的重要保证,其故障诊断是电力部门十分关注的问题.为了给接地网的故障诊断提供有效的指导,本文对接地网网格导体电阻分布的数学模型进行了深入研究.基于电网理论,借助最小电能消耗原理建立了模拟接地网电阻分布的数学模型.进一步使用全局寻优方法获得其真实电阻分布值,并通过与原始值比较可以判断故障点.仿真计算表明本文所给出的数学模型是可行的,对于接地网故障诊断具有较好的指导作用.

Grounding grid is very important for the safe operation of the substations,and the fault diagnosis is of great concern to the electricity sector.In order to provide effective guidance to fault diagnosis,by means of the least energy principle,a mathematical model is established to explore the resistance distribution of grounding grid in this paper,which is based on the theory of the electrical network.Applying the global optimization methods,we obtain the actual resistance distribution of the grounding grid.Comparing with the original resistances of the grounding grid,the fault segments can be judged.The simulation results show that the proposed mathematical model is feasible,and it gives a positive guidance for the fault diagnosis.