【Key words】 electric power transformer； fault tree； expert system； fuzzy theory etc；
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现代计算机技术、电源技术与模糊控制理论等，为智能充电系统的研究提供了新的技术手段。
Modern computer technique, power supply technique and fuzzy control theory provide new technical method for research of intelligent charging system.
本文分析了原有的DGA故障诊断方法，包括三比值法、人工神经网络法、模糊理论、变压器诊断专家系统、灰色关联算法等。
The article analyses original methods of DGA fault diagnose, include three-ratio method, artificial neural network method, Fuzzy Theory, diagnosing expert system, grey relational algorithm, et.
其中包括多级模糊优选理论与模型、目标权重的确定等新颖内容。
These include some new achievements such as multiobjective fuzzy optimum seeking theory and model for multilayer system, definition of objective weight etc.
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