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在电力系统运行过程中,变压器运行工况复杂,多种故障模式共存,某一故障发生后,若处理不当,可能引起故障传播与扩散,对系统运行效益带来不利影响.为揭示这一现象对系统状态检修决策的影响,建立考虑故障传播的变压器机会维修模型.该模型从变压器内部故障传播机理出发,给出变压器状态转移过程.在此基础上,为防止变压器局部故障扩散成重大安全事故,在对某一故障检修时对其他故障进行机会维修,给出随检修策略变动的系统检修风险和系统故障风险的量化表达,并以二者之和最小为目标,计及系统状态检修约束条件,完成变压器机会维修的建模.算例分析表明,该研究是可行、有效的.“,”During power transformer operation,there exist multiple faults due to complex working environment.When a fault happens,accelerating the development of other faults,power system operating efficiency can be adversely impacted.This phenomenon is called fault propagation.To study the impacts of fault propagation on power transformer maintenance strategies,an opportunistic maintenance optimization model was proposed.From a practical point of view,the transformerstate transition process was modeled based on the fault propagation mechanism.Furthermore,to prevent a local fault from leading the system to a catastrophic fault,system maintenance risk and system failure risk were quantified considering scheduled maintenance and opportunistic maintenance.Finally,the sum of system maintenance risk and system failure risk was minimized with maintenance constraints.Numerical studies indicate the feasibility and validity of the proposed model.