Abstract
Partial discharge of soil occurs when a lightning current enters the ground, and the strength of partial discharge is closely related to the magnitude of its critical breakdown field strength. Therefore, how to accurately obtain the variation law of the typical soil critical breakdown field strength and residual resistivity is the key to realizing the safe operation of the grounding devices and cables in the ground. This paper first selects a variety of typical soils to study the influence of various factors on the morphology of the discharge channel, and then studies the calculation methods of the soil critical breakdown field strength and residual resistivity under the introduction of different discharge channel morphologies and structures, and further discusses the reason why typical soil media factors have a small impact on the critical breakdown field. The experimental results show that under the same conditions, the critical breakdown field strengths of different soils from small to large are sand soil, loam soil and Yellow cinnamon soil. The largest ratio of residual resistivity to initial resistivity of the three soils is sand soil.
Highlights
At present, people have carried out a lot of research on dielectric breakdown, lightning protection and grounding [1,2,3,4,5,6,7,8,9,10,11,12]
There are relatively few studies on the influence of these factors on the critical breakdown field strength and residual resistivity, so it is necessary to carry out relevant research
Studies have shown that the soil water content, salt content and soil density have an impact on the value of soil critical breakdown field strength
Summary
People have carried out a lot of research on dielectric breakdown, lightning protection and grounding [1,2,3,4,5,6,7,8,9,10,11,12]. In the process of studying the mechanism of soil impact breakdown, determining the critical breakdown field strength Ec and residual resistivity ρres of the soil is a very important goal of the research work. The large difference in the calculation results is mainly due to the differences in the soil discharge models used when calculating the critical soil breakdown field strength. There are relatively few studies on the influence of these factors on the critical breakdown field strength and residual resistivity, so it is necessary to carry out relevant research. Through the impulse current generator and the X-ray transmission imaging platform, relying on the three-dimensional reconstruction and inversion calculation methods, the influence of different typical soil media factors on the critical breakdown field strength and residual resistivity is studied, and the influence rules are analyzed. The image processing system PC is used to adjust the output parameters of the X-ray generator and display the imaging results
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