高电压技术2017，Vol.43Issue(6)：1988-1994,7.DOI:10.13336/j.1003-6520.hve.20170527033
油纸绝缘等效电路参数辨识及老化状态评估
Method for Parameter Identification of Equivalent Circuit of Oil-paper Insulation and Its Research
摘要
Abstract
Analyzing the equivalent circuit of oil paper insulation is one of the effective ways to diagnose aging of transformer insulation.It is difficult to accurately identify the parameters in current research.We abandon the method of using the recovery voltage characteristics to identify the parameters of oil paper insulation,and present a new method to identify circuit model and parameter.Adopting the voltage curve which contains rich dielectric relaxation response information and the differential spectrum response voltage of dielectric relaxation response information which contains dielectric relaxation response information,we analyze the relationship between the relaxation parameters and the parameters of the equivalent circuit.The new method can determine the equivalent circuit topology,and avoid complex computation equations.Meanwhile,it can solve the linear parameters of atypical free relaxation,and the results show the method is feasible and accurate.Finally,the relationship between equivalent circuit parameters of transformer insulation and aging status is studied.The results indicate that the recovery voltage can be decomposed to five sub-lines,and the line shape factors close to 0.5 when the insulation performance is good,the number of sub-lines and line shape factors increases with ageing.Therefore,the number of sub-lines and linear parameters can accurately reflect the state of oilpaper insulation aging.关键词
油纸绝缘/参数辨识/时域微分解谱/恢复电压/绝缘诊断Key words
oil-paper insulation/parameter identification/time-differential unfolding/recovery voltage/insulation diagnosis引用本文复制引用
贺德华,蔡金锭,蔡嘉..油纸绝缘等效电路参数辨识及老化状态评估[J].高电压技术,2017,43(6):1988-1994,7.基金项目
国家自然科学基金(61174117).Project supported by National Science Foundation of China (61174117). （61174117）
