Investigation on Thermal Aging Characteristics and Lifetime Model of Oil-Paper Insulation for HV AC Bushing
Yang Lijun1,Huang Jiajia1,Xu Zuoming2,Hu Ende1,Gao Sihang1
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2.Wuhan Branch China Electric Power Research Institute Wuhan 430074 China
Abstract：To investigate the thermal aging characteristics of the oil-paper insulation in high voltage (HV) bushings,the paper and aluminum foil wrapped copper winding models combined with the insulating oil are used to perform the thermal aging experiments under 90 ℃,100 ℃,and 130 ℃,respectively.Physical/chemical parameters,which can reflect the aging condition of the oil-paper insulation,are measured and analyzed.In addition,the electro-thermal aging experiment of the scaling bushing is carried out under 100 ℃ as well in order to obtain the dielectric response,and the electrical characteristics and physical/chemical parameters after the bushing has a breakdown.Experimental results show that the outermost layer of the bushing manifests the lowest dielectric strength among multilayer oil papers.The descending speeds of the degree of polymerization (DP) for the outermost layer paper both in the paper wrapped copper winding model and the scale bushing are the fastest,whereas the inner layer papers are slower.The distribution of moisture and oleic acid is regarded as the reason for this phenomenon.It is also found that low frequency capacitance is more sensitive to the variation of insulation status of bushing compared with traditional power frequency capacitance.The oil-paper insulation thermal aging lifetime model for the bushing is then established based on the relationship of the outermost paper layer’s DP changing with time.The effectiveness of the model is preliminarily verified.
杨丽君，黄加佳，许佐明，胡恩德，高思航. 高压交流套管的油纸绝缘热老化特性及寿命模型研究[J]. 电工技术学报, 2016, 31(5): 144-151.
Yang Lijun,Huang Jiajia,Xu Zuoming,Hu Ende,Gao Sihang. Investigation on Thermal Aging Characteristics and Lifetime Model of Oil-Paper Insulation for HV AC Bushing. Transactions of China Electrotechnical Society, 2016, 31(5): 144-151.
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2016, Vol. 31 
