8Shroff D H, Stannett A W. Review of paper ageing in power transformers[J]. IEE Proceedings- C: Generation, transmission and Distribution, 1985, 132(6): 312-319.
9Emsley A M, Stevens G C. Review of chemical indicators of degradation of cellulosic electrical paper insulation in oil-filled transformers [ J ]. IEE Proceedings - Science Measurement Technology, 1994, 141(5):324-333.
10Hill D G T, Le T T, Darveniza M, et al. Study of degradation of cellulosic insulation materials in a power transformer, part 1 : molecular weight study of cellulose insulation paper[J]. Polymer Degradation and Stability, 1995, 49(1):79-87.
