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某水电站1台840 MV·A主变压器在运行期间例行油色谱分析发现乙炔含量上升,影响主设备安全稳定运行。检修人员查找出故障点在上夹件磁屏蔽,并对结构进行分析,明确了故障原因是设计上的结构缺陷,提出了相应的改进设计,对该型所有主变压器的磁屏蔽进行了更换,防止了该家族性缺陷产生的安全风险。
A 840 MV · A main transformer at a hydropower station during routine oil chromatography analysis found that the acetylene content increased, affecting the safe and stable operation of the main equipment. Maintenance personnel to find out the point of failure in the magnetic shield on the clip, and the structure analysis, a clear cause of the failure is the design of structural defects, put forward the corresponding improved design, the type of all the main transformer magnetic shielding has been replaced, Preventing the security risks posed by this familial defect.