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In this essay, in the view of the ground grid corrosion problem, we establish a theoretical calculation model and engineering application model based on the way changing the current injection position and multiple measuring at each position. Finally, proposing a corresponding optimization algorithm on the basis of analyzing the characteristics of the problem. There are too many redundant equations...
The method of corrosion diagnosis for substation grounding grids based on large change sensitivity is proposed. By analyzing the node voltages, the large change sensitivity of the port voltages in response to the branch resistances is given and the nonlinear optimal model of corrosion diagnosis is established. The diagnosis equations based on the differential sensitivity were set up in traditional...
Making use of the electric network theory and the matrix theory, the fault diagnosis equations are set up in the form of sensitivity matrix. Then the method of multiple-excitation is applied to increase the number of independent equations and resolve the problem of morbid equations effectively. By introducing the micro-disposal method and the iterative algorithm, we can use the least squares approach...
The requirements of a good test scheme are described, such as independent excitation, none-repeated measurement, large voltage signals and sensitive to the changes of branch resistances. Reciprocity theorem and superposition theorem can be used to determine whether a test scheme is completed. Theorem of Maximum Voltage is proved through reduction to absurdity, and its three inferences are put forward,...
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