微量处理法在变电站接地网腐蚀诊断中的应用

接地网导体的腐蚀乃至断裂是引起接地网事故的根本原因,借助测量及诊断方法及时发现接地网事故的隐患,能减少因接地网腐蚀而造成的损失。为此根据接地网的结构特点和在变电站中的实际情况,建立相应的电路分析模型,应用增量网络法建立灵敏度矩阵和腐蚀诊断方程;提出了微量处理方法,使得足够数量的故障诊断方程在极小的区域内线性化,改进的迭代约束条件保证了每一步迭代值都向着真实支路电阻值逼近以解决方程的非线性问题。实际接地网测试验证了腐蚀诊断程序的可行性,所提出的微量处理方法较好地解决了腐蚀诊断方程的非线性问题,腐蚀诊断结果表明腐蚀支路及其故障倍数的判定基本准确。

Application of Micro Disposal Technology in Diagnosing the Corrosion of Grounding Grid

To find the hidden problems of grounding grid in time and to reduce the loss due to the corrosion,on the basis of the design feature and the practical situation of substation grounding grid,a circuit analytic model is established.By using incremental network method,the sensitivity matrix and the matching corrosion diagnosis equations are set up,and a micro-disposal method is put forward,then enough quantitative corrosion diagnosis equations are linearized in a minimal region,the modified iterative conditions can ensure the iterative value to approach to the real branch resistances,the nonlinear problem is preferably settled by this method.By the verification of real grid test,the corrosion diagnosis program is valid,and the micro-disposal method has solved the nonlinear problem preferably,the diagnosing result proves that the judgments of fault branch and its corrosion multiple are correct.