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A Study on the Design of Compact Polymer Bushing with Inner Control Shield

내부쉴드 구조에 따른 컴팩트한 폴리머 부싱 설계에 관한 연구

  • 조한구 (한국전기연구원 나노융합소재연구센터) ;
  • 유대훈 (한국전기연구원 나노융합소재연구센터) ;
  • 강형경 (한국전기연구원 나노융합소재연구센터)
  • Published : 2009.05.01

Abstract

This paper describes a study on the design of compact polymer bushing with inner control shield. In the bushing, a high electric stress occurred between field shaper and central conductor by the closely space. Also coaxial cylindrical shield has a great height along the axis to control an electric field. Consequently, all the potentials are raised axially along the field shaper and electric stress is concentrated on a part of the surface of the FRP tube near the upper end of the field shaper. In accordance, the field control can be achieved by means of the designs of such inner control shields. The floating and ring shield designs was decreased electric field concentration at critical parts of the bushing. The shield gaps is formed between field shaper and ring shield. Accordance equipotential lines extend through gaps. As a result, the resulting electrical stress are thus reduced in the range $17{\sim}23%$ in the bushing with floating and ring shield designs. Maxwell 2D simulator based on the boundary element method was also introduced in order to verify the reliability of the polymer bushing. The optimized design uses internal elements for electric stress grading at critical parts of the bushing.

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