비의류제품

gel permeation chromatography of the thermal degradation of cellulose insulation paper in an aged power transformer

  • 출판일1999.03
  • 저자
  • 서지사항
  • 등록일 2016.11.02
  • 조회수 536
the lifetime of a power transformer and its capacity to be refurbished is often determined by the condition of the cellulose insulation materials used to wrap the copper windings. as a transformer ages the molecular weight of the cellulose in the insulation paper decreases. here we describe a study of the accelerated ageing of cellulose insulation paper and cotton linter under vacuum at 166 $degree$ c. the study indicates that the degradation results in a bimodal distribution in molecular weight of the cellulose, which indicates that the scission of bonds in the cellulose chains is non-random, and bonds near the middle of the chains have a higher probability of bond scission than those near the ends. this has been associated with the rod-like structure of the cellulose molecules. (author abstract) 7 refs
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