对运行中的变压器进行状态评价,可以判断变压器的健康状况,从而为变压器的检修提供决策依据.针对传统评价方法的多因素性及难以确定评价指标权重等问题,提出一种基于改进灰靶理论的变压器状态评价方法.将变压器划分为6个分部件构建状态评价体系,并根据历史试验数据及指标的变化趋势采用层次分析法和熵权法获得各指标的综合权重.通过构造改进灰靶评价模型计算靶心度,再结合状态分级策略得到变压器的健康状态.将该方法应用于实际案例,评价结果表明,该方法可以快速、准确地判断变压器的运行状态,进而提高变压器的安全、稳定及经济运行水平.%The transformer state evaluation can be used to determine the health of transformers. A transformer status evaluation method based on the improved gray target theory was proposed. The transformer was divided into six sub-components to build the state evaluation system, and the comprehensive weight of each index was obtained by using analytic hierarchy process (AHP) and entropy theory based on historical data and variation tendency. The gray target index was obtained by constructing an improved evaluation model. Transformer healthy status was estimated from the gray target index combined with the state classification strategy. The investigations reveal that the proposed method is efficient in evaluation of the transformer operation state.
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