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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 (inequality group) when we establish the model by using the method of changing the current injection position and multiple measuring at each position. We remove those redundant equations (inequality group) by using great linearly independent groups corresponding to the initial feasible solution. But the the initial feasible solution is not easy to find, we apply least square method to solve the problem. Simulation shows that the model is correct, the method is valid.

We design a system of multiplex data acquisition, this acquisition system required not only to be run in high precision magnitude, but also to be capable of restraining power frequency interference for the case of complex application environment complex. In this paper, the advanced high-precision Σ-ΔA/D converter was introduced to be the front end of the 24bits data acquisition system and the π-type RC filter and Sinc3-type FIR notch filter were applied to restrain the power frequency interference. Simultaneously the USB2.0 bus technology was adopted with the EZ-USB FX2 controller to control A/D converter to transmit data to the upper computer for further analyzing. In the application of Corrosion Diagnosis for transformer substation Ground Grid, lab experiments and the field tests are to prove that this system can effectively restrain 50 Hz power frequency interference.