Abstract
The transient analysis model of grounding systems is an important tool to analyze the lightning characteristics of grounding devices. When lightning enters the soil through the grounding device, there is a centralized discharge channel. The spatial structure of the discharge channel in the soil has a great effect on the accuracy of the transient analysis model of the soil impulse discharge. In this paper, based on the gray information analysis method, the volume of successive impulse discharge channels in the ground under various currents and soil conditions is calculated, and the changing law with time interval is analyzed. According to the experimental results, an analysis method of the model considering the discharge channel structure is proposed, and an example is analyzed. The results show that the time interval has an effect on the volume of the discharge channel. In a certain range, the volume of the channel increases with the time interval of successive impulse discharges. Taking the critical breakdown electric field strength as the judgment condition and the residual resistivity as the variable, the development process of the discharge channel can be simulated. The calculated results of the model are close to the experimental results.
Highlights
Soil is the most important medium in the grounding system [1,2,3,4,5]
The morphology and structure of the discharge channel is one of the most important factors to characterize the discharge, and it is one of the most important factors that affect the accuracy of the grounding device transient analysis model
The accuracy of the lightning transient model of grounding device can be improved by constructing a soil impulse discharge model considering the structure of the discharge channel, which is more suitable for the actual situation
Summary
Soil is the most important medium in the grounding system [1,2,3,4,5]. Its discharge characteristics directly affect the lightning strike performance of grounding devices [6,7,8]. It is very important to obtain the actual structure of the soil discharge channel for building the lightning transient model of grounding systems and accurately calculate discharge characteristic parameters. The characteristic parameters of lightning discharge in soil are calculated based on the discharge channel structure in literature [1,2,7], and the transient analysis model of the grounding system is established. It is very difficult to accurately observe the discharge channel structure in the soil and to consider it in the calculation of characteristic parameters To solve these challenging problems, X-ray transmission imaging technology is used to obtain multi-view images of the discharge channel structure. Compared with the conference papers, the new research content of this paper is the analysis method and modeling method of the soil successive impulse discharge process considering the structural characteristics of discharge channels. TThhee SSGGSS wwaass ppllaacceeddnneexxtttotoDDSSaannddimimagaegdedatatthtehseasmaemteimtiem. eT.hTehoebolibqluiqe ubeafbflaeffsleet sinettihne tShGeSSGS ccoouulldd pprroodduucceeaassooilillalayyeerrwwitihthgrgardaudaulathl itchkinckesnse, sws,hwichhiwchaswuassedustoedantoalyaznealtyhzeecothrreescpoorrnedsipnognding rreellaattiioonnsshhiippbbeetwtweeenensosiol itlhtichkicnkesnseasnsdanimdaigmeaggraeygvraalyuev.alue
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