最后，通过构造动态灰靶评价模型求得靶心度，再结合状态分级策略得到变压器的健康状态。

Finally, the model is built by constructing a dynamic gray target, and then the healthy state of transformer is obtained by the state classification strategy.

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对此，结合实例进行了分析，并提出了根据实际综合考虑的分级绝缘变压器中性声、过电压保护的有效方式。

However, the performance of this protective mode is not satisfactory. Based on operational examples, analysis on such mode is conducted and suggestions in view of different conditions are presented.

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