The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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AC Insulation Breakdown Properties of the EMNC to Application of Distribution Molded Transformer

배전용 몰드변압기 적용을 위한 EMNC의 교류절연파괴특성 연구

  • Park, Jae-Jun (Dept. of Electrical Electronic Engineering, Joongbu University)
  • 박재준 (중부대학교 전기전자공학과)
  • Received : 2013.04.06
  • Accepted : 2013.04.28
  • Published : 2013.05.01
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Abstract

A conventional epoxy-microsilica composite (EMC) and an epoxy-microsilica-nanosilicate composite (EMNC) were prepared in order to apply them to mold-type transformers, current transformers (CT) and potential transformers (PT). Nanosilicate was exfoliated in a epoxy resin using our electric field dispersion process and AC insulation breakdown strength at $30{\sim}150^{\circ}C$, glass transition temperature and viscoelasticity were studied. AC insulation breakdown strength of EMNC was higher than that of EMC and that value of EMNC was far higher at high temperature. Glass transition temperature and viscoelasticity property of EMNC was higher than those of EMC at high temperature. These results was due to the even dispersion of nanosilicates among the nanosilicas, which could be observed using transmission electron microscopy (TEM). That is, the nanosilicates interrupt the electron transfer and restrict the mobility of the epoxy chains.

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References

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