Abstract
The grounding grid plays an important role in the safe and reliable running of substation, The study on detection and fault diagnosis of grounding grid will provide an effective means for its state evaluation. This paper proposes a multiple parameter imaging method for grounding grid by pulsed electromagnetic inverse, that aims at accurate positioning and quantitative evaluation of corrosion and breakpoint for power system grounding grid, and the new method intends to realize the image reconstruction of electrical conductivity, permittivity and structure for grounding grid. Using the characteristics of electromagnetic wave propagating in different medium surface, the new method establishes the mathematical-physical model and analyzes the electromagnetic field propagation characteristics between grounding grid and the surrounding medium.
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