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This paper proposed a more accurate assessment model for the transformer which in the loss fault period. Firstly, we established the transformer fault tree model, then calculated the Probability importance of each event in fault tree, and get the weighting of each event in fault tree. Secondly, we determined the membership function of each event in fault tree, and give the different membership function for transformer running on accidental failure period and loss fault period. And thus it can be more accurately determine the operational status for the transformers which in the loss fault period. Finally, we combined with the weight of each end of the event indicators to derive the status of transformer. The examples show that this method is reasonable and effective. KeywordsTransformer;fault tree;accidental failure period;loss fault period;membership function

The Transformer Condition Assessment Model is Based on The Fuzzy Calculation