Abstract
A transient electromagnetic detection method for site selection of substation grounding is proposed in this paper. And taking the fault detection experiment of transmission lines in a certain area of China as an example, the transient electromagnetic technology is used to obtain high-quality images reflecting the development trend and distribution of geological faults. The results show that the transient electromagnetic method is a convenient and effective way for substation site selection.
Highlights
The stability of power supply has attracted much attention, and landslides around the substation pose a threat to the safety of power transmission, so it is urgent to carry out high-resolution detection and evaluation of geological structures near the surface
Inspired by the fact that the resistivity value can be used as the detection index of landslide deformation and startup[6,7], the imaging technology of transient electromagnetic apparent resistivity has a good prospect in the field of geological disaster prediction in substations
The landslide fracture development zone has strong permeability, low medium water content, irregular distribution of fracture voids in space, high bedrock resistivity, and the distribution law of landslide body can be detected by transient electromagnetic apparent resistivity imaging
Summary
The stability of power supply has attracted much attention, and landslides around the substation pose a threat to the safety of power transmission, so it is urgent to carry out high-resolution detection and evaluation of geological structures near the surface. The common method to find out the landslide overburden and sliding surface is to drill or dig holes by hand at a certain interval in the landslide area. It requires a large amount of engineering, cost, and time. The response signal of the secondary field is observed by the receiving coil, and the variation of that with time is studied, and the electrical parameters and spatial distribution of the underground conductive geological body are determined [8]. The landslide fracture development zone has strong permeability, low medium water content, irregular distribution of fracture voids in space, high bedrock resistivity, and the distribution law of landslide body can be detected by transient electromagnetic apparent resistivity imaging.
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