Characteization of Space Charge Distribution and Conduction Current in Dielectric material With Temperature

온도에 따른 유전체내에서의 공간전하 분포와 전도전류 특성

  • Kim, Jin-Kyun (Department of Electrical Engineering, Seoul National University) ;
  • HwangBo, Seung (Department of Electrical Engineering, Seoul National University) ;
  • Han, Min-Koo (Department of Electrical Engineering, Seoul National University)
  • 김진균 (서울대학교 공과대학 전기공학과) ;
  • 황보승 (서울대학교 공과대학 전기공학과) ;
  • 한민구 (서울대학교 공과대학 전기공학과)
  • Published : 1995.07.20

Abstract

The pulsed electro-acoustic method was used as a nondestructive measurement technique of spare charge distribution in dielectric materials. In our work presented here, we measured simultaneously the space charge distribution and conduction current in the low-density polyethylene samples with elevated temperatures up to $80^{\circ}C$ and electric field up to 20kV/mm. In the temperature less than $50^{\circ}C$, homocharges are mainly accumulated close to the electrodes under DC bias and after grounding. At the temperature exeeds $50^{\circ}C$, heterocharges are accumulated near the opposite electrode under DC bias. However after grounding the upper electrode, this charges immediately disappeared. The conduction current in LDPE at $20^{\circ}C$ and $30^{\circ}C$ was reduced slowly with increasing interval of applied voltage. But as temperature increased, the conduction current tended to increase slowly with the time and the degree of increase is enlarged.

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