Service Life Analysis of Power Transformer Based on Reliability
Wenbin Zhang · Power System Technology · 2011
To have an insight into the state change of power transformer during its total life cycle,based on the fault tree analysis a reliability model and a ageing model of power transformer are built.The curve of the relation between operation years and mean reliability level(MRL) of power transformer is fitted by the method of least squares,and different age limits that power transformer comes into and mean time between failures(MTBF) are calculated to offer reasonable foundation to determine optimal maintenance period and draft optimal maintenance scheme to achieve the aim to prolong the service life of power transformer.The effectiveness of the proposed method is verified by results of calculation example.