| Title |
Analysis of Surface Charge Accmulation and Current Pulse Characteristics in a Lossy Dielectric under Needle-Plane Electrodes Considering Different Electrical Conductivity Models |
| Authors |
신효준(Hyo-Jun SHIN) ; 이세희(Se-Hee Lee) |
| DOI |
https://doi.org/10.5370/KIEE.2026.75.10.2526 |
| Keywords |
Surface charge accumulation; Current pulse; Lossy dielectric; Nonlinear conductivity; Gas-Solid interface; Finite element method |
| Abstract |
This paper investigates the effects of electrical conductivity models of a lossy dielectric on current pulses and surface charge accumulation in a needle-plane electrode system. Two constant-conductivity cases were compared with a nonlinear model dependent on electric field and temperature. For the nonlinear model, uniform 30°C and temperature-gradient conditions were considered separately. The constant-conductivity cases showed similar pulse magnitudes but different timings, while the temperature-fixed nonlinear model caused only limited changes. In contrast, the temperature-gradient model produced clear differences in current pulses and surface charge distribution. At the same interface position, the surface charge density decreased by about 90%, and the location of maximum charge accumulation shifted. These results show that spatial variations in conductivity due to electric field and temperature significantly affect transient discharge and interfacial charge behavior. |