1. Sun, C.H., Li, T.M.: Research on diagnosis technology of oil paper insulation aging based on probabilistic neural network. In: Insulation materials (2021). (in Chinese)
2. Li, T.B., Tong, J.X.: Influence of aging on dielectric properties and characteristic quantities of UHV Transformer oil paper insulation. In: Transformer (2021). (in Chinese)
3. Fan, Z., Chen, W.G., Yang, D.K., Zou, J.X.: Analysis and Research on micro characteristics of oil paper insulation at different aging. In: China test (2019). (in Chinese)
4. Tang, C., Chen, G., Fu, M., Liao, R.J.: Space charge behavior in multi-layer oil-paper insulation under different DC voltages and temperatures. In: IEEE Transactions on Dielectrics and Electrical Insulation, vol. 17, no. 3, pp. 775–784, (2010)
5. Qi, B., Wei, Z., Gao, Y., Li, C.R., Zhang, X.H., Zuo, J.: Characteristics of air gap discharge in oil-paper insulation under different proportion of AC-DC composite electric field. In: Proceedings of the CSEE (2015). (in Chinese)