Based on the simulation calculation of grounding grid corrosion, a non-excavation method of grounding grid corrosion detection scheme is designed. Firstly, a given excitation current signal is injected into the diagonal of the measurement area of the ground network. Then, the magnetic field intensity of the current conductor directly above the ground is detected, the current intensity is solved by the Bio-Savart law, and R=U/I is calculated with the voltage signal measured between the accessible nodes. Finally, the degree of resistance corrosion between each group of nodes is obtained.

In electromagnetic detection, the received signal strength is largely determined by the transmitter’s signal strength. Therefore, it is necessary to select and design the transmitting coil to meet the requirements of the electromagnetic launching system. To obtain better-transmitting coils, Maxwell is used to establishing square and toroidal coil models for calculation and compare magnetic field intensity and uniformity. To cope with electromagnetic exploration in a complex environment, the electromagnetic field model of the three-axis toroidal coil and square Helmholtz coil is established. The magnetic field simulation results verify that the three-axis square Helmholtz coil has higher emission field intensity under the same excitation condition, which is suitable for electromagnetic exploration.