Search results for "transient currents"

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SOIL IONIZATION DUE TO HIGH PULSE TRANSIENT CURRENTS LEAKED BY EARTH ELECTRODES

2009

This paper proposes a numerical model of the soil ionization phenomena that can occur when earth electrodes are injected by high pulse transient currents, as the one associated with a direct lightning stroke. Based on finite difference time domain numerical scheme, this model ascribes the electrical breakdown in the soil to the process of discharge in the air. In fact, as soon as the local electric field overcomes the electrical strength, the air in the voids trapped among soil particles is ionized, and the current is conducted by ionized plasma paths locally grown. The dimension of these ionized air channels is strictly dependent upon the local temperature. Thus, a local heat balance is en…

Materials scienceFinite-difference time-domain methodElectrical breakdownPlasmaMechanicsCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsPulse (physics)Settore ING-IND/31 - ElettrotecnicaSettore MAT/08 - Analisi NumericaElectric fieldIonizationTransient (oscillation)transient currentsElectrical and Electronic EngineeringCurrent (fluid)numerical modelfinite difference schemeProgress In Electromagnetics Research B
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