On the basis of the fuzzy mathematics theory and the evidence theory, an assessment model of bushing condition of transformers is proposed in this paper. Firstly, the hierarchical evaluation index system is constructed from the perspectives of qualitative and quantitative, which is based on experimental data and also considering the inspection tour program. Then, considering the shortages of single weighting in transformer condition assessment, this paper introduces a method to obtain the optimal weight. The subjective and objective factors are combined through solving the minimum deviation optimal function. Meanwhile, for the fuzziness and uncertainty of index information, the original reliability allocation of state variables are calculated and updated by adopting the fuzzy evaluation method. And then the modified evidence sources and combination rules are utilized to evaluate the bushing condition level. Finally, the results of case study show that this method is accurate and effective.
王 泉,姚俊伟,智 李,杨星磊,付 豪,方 程.基于矩估计法和模糊-证据融合的电力变压器套管状态评估[J].电力科学与技术学报英文版,2020,35(1):130-136. WANG Quan, YAO Junwei, ZHI Li, YANG Xinglei, FU Hao, FANG Cheng. Condition assessment of power transformer bussing based on moments estimator and fuzzy evidence combination method[J]. Journal of Electric Power Science and Technology,2020,35(1):130-136.Copy