The economical operation of transformers is not considered directly in traditional substation Reliability evaluation methods, The load coefficient is analyzed under transformer economic operation in this paper. Four state models are established to analyze the reliability of main electric connection in four typical ways, when transformer is operated on different modes. The reliability technology indexes are converted into the economic ones. In order to obtain the optimal design scenario in economy and reliability, a comprehensive evaluation method are proposed that the power interruption losses in substation, transformer operation costs and investment cost are combined. New load coefficient for economic operation of transformers is recommend. The example analysis results show that the proposed method is effective, comprehensive and reasonable.%现有变电站可靠性评估计算中,均未能直观地显示出可靠性导致的经济效益.针对变压器经济运行的负载系数进行分析；建立元件的状态模型,应用解析法分析4种典型电气主接线方式在不同的主变运行模式下的可靠性,并将可靠性技术指标转化为经济指标；为选择经济性和可靠性最优的主接线设计方案,提出考虑变电站停电损失、变压器损耗费用和变电站投资运行年最小费用的综合指标评价方法,并推荐新的变压器经济运行负载系数.箅例表明,考虑变压器经济运行的可靠性计算、可靠性的经济性量化以及综合经济指标分析,对设计及方案评价更为有效、全面和合理.
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