2Wang M. Vandermaar A J, Srivastava K D. Review of assessment of power transformers in service [J]. IEEE Elect Insul Magaz, 2002,18(6) : 12-25.
3Mokhnacke L. Boubakeur A. Feliachi A. Prediction of thermal ageing in transformer oil and high voltage PVC cables using artificial neural networks [J]. Science, Measurement & Technology, IEE Proceedings, 2003,150 (5) :107-112.