电力变压器故障模式的分析及危害评估

Failure Mode Effect and Criticality Analysis for Condition Maintenance of Power Transformer

对大型电力变压器进行了故障模式及影响分析(FMEA)和危害性分析(CA)。在FMEA中重点讨论了系统定义方式以及故障模式的分析项目,以便为故障诊断等维修活动提供更为全面有效的支持;在CA中针对常规危害度评价算法存在可靠性数据不易获得、评价因素单一的局限性,将模糊数学引入故障模式的危害评价中。提出了基于故障发生频率、严重程度以及检测难度三因素的模糊危害度评价模型,较为客观地描述了故障的危害性。

Investigation of the characteristics of transformer faults is primary and basic for condition maintenance. FME-CA (Failure Modes, Effects and Criticality Analysis) is a powerful analysis method for system reliability. In this work, FMECA, including FMEA (Failure Modes, Effects Analysis) and CA (Criticality Analysis), is applied to the fault analysis of large-scale power transformer. In FMEA, to enhance its assistance for fault diagnosis and the assignment of maintenance task, the mode of system definition and analysis items are focused on; In CA traditional critical-ity evaluation model is not feasible because of lacking for reliability data and incomprehensiveness of evaluation factors. Therefore a fuzzy synthetic evaluation model considering three factors fault frequency, severity and testability is presented. This model is more objective in the description of the criticality of transformer.