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.