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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- Korean Institute of Information Scientists and Engineers Journal of Electrical Engineering and Information Science Journal of Electrical Engineering and Information Science Vol.2 No.3
- 발행연도
- 1997.6
- 수록면
- 71 - 76 (6page)
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초록· 키워드
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A lot of experiments and analyses have been done to determine the aging mechanism of mica-epoxy composite material used for large generator stator windings in order to estimate remaining life of the generator for last decades. After degrading artificially the mica-epoxy composite material, the surface analysis is performed to analyze breakdown mechanism of insulation in air and hydrogen atmosphere; ⅰ) In the case of air atmosphere, it is observed that an aging propagation from conductor to core by partial discharge effect and the formation of cracks between layers is widely carbonized surface. ⅱ) In case of hydrogen atmosphere, the partial discharge effect is reduced by the hydrogen pressure(4㎏/㎠). Potassium ions forming a sheet of mica is replaced by hydrogen ions, which can lead to microcracks. It is confirmed that the sizes of crack by SEM analysis are 10~20[μ m] in diameter, 200~400[μ m] in length under air, and 1~5[μ m] in diameter, 10~50[μ m] in length under hydrogen atmosphere respectively. The breakdown mechanism of stator winding insulation materials which are composed of mica-epoxy is analyzed by the component of materials with EDS. SEM techniques. We concluded that the potassium ions of mica components are replaced by H^+, H₃O^+ at boundary area of mica-epoxy and/or mica-mica. It is proposed that through these phenomena, the conductive layers of potassium enable creation of voids and cracks due to thermal, mechanical, electrical and environmental stresses.
목차
Abstract
Ⅰ. Introduction
Ⅱ. Experimental System
Ⅲ. Results and Discussions
Ⅳ. Conclusions
References
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