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不确定问题是建立变压器故障诊断系统中一个难点。本文从不确定知识的获取，不确定知识的表示和不确定推理三个方面，利用模糊理论进行研究分析，并提出解决问题的对策。
Uncertainty problem is to establish a fault diagnosis system transformer a difficult point. This article from three aspects of indefinite knowledge acquisition, indefinite knowledge representation and indefinite reasoning, makes use of fuzzy theory to carry on the research and analysis, and puts forward the solution to the problem.