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Hydrodynamic Modeling for Discharge Analysis in a Dielectric Medium with the Finite Element Method under Lightning Impulse
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 Title & Authors
Hydrodynamic Modeling for Discharge Analysis in a Dielectric Medium with the Finite Element Method under Lightning Impulse
Lee, Ho-Young; Lee, Se-Hee;
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 Abstract
The response of lightning impulse voltage was explored in dielectric liquids employing hydrodynamic modeling with three charge carriers using the finite element method. To understand the physical behavior of discharge phenomena in dielectric liquids, the response of step voltage has been extensively studied recently using numerical techniques. That of lightning impulse voltage, however, has rarely been investigated in technical literature. Therefore, in this paper, we tested impulse response with a tip-sphere electrode which is explained in IEC standard #60897 in detail. Electric field-dependent molecular ionization is a common term for the breakdown process, so two ionization factors were tested and compared for selecting a suitable coefficient with the lightning impulse voltage. To stabilize our numerical setup, the artificial diffusion technique was adopted, and finer mesh segmentation was generated along with the axial axis. We found that the velocity from the numerical result agrees with that from the experimental result on lightning impulse breakdown testing in the literature.
 Keywords
Lightning impulse;Dielectric liquids;Transformer oils;Hydrodynamic drift-diffusion equation;Finite element method;Electric breakdown;Artificial diffusion technique;
 Language
English
 Cited by
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1.
Electrohydrodynamic Analysis of Dielectric Guide Flow Due to Surface Charge Density Effects in Breakdown Region, Journal of Electrical Engineering and Technology, 2015, 10, 2, 647  crossref(new windwow)
2.
Numerical and Experimental Validation of Discharge Current With Generalized Energy Method and Integral Ohm's Law in Transformer Oil, IEEE Transactions on Magnetics, 2014, 50, 2, 257  crossref(new windwow)
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Fully Coupled Finite Element Analysis for Cooling Effects of Dielectric Liquid Due to Ionic Dissociation Stressed by Electric Field, IEEE Transactions on Magnetics, 2013, 49, 5, 1909  crossref(new windwow)
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