LCC Assessment on the Best Life Cycle of Substation Equipments

For fully assessing the life cycle costs of substation equipments,except the purchase costs of equipments,the detailed operating and maintenance costs need to be considered as they be selected.Taking the power transformers for example and collecting the monitoring and experimental data of a certain type transformer,by adopting the Fault Tree method this paper assesses its failure rate,and fits its failure rate curves of life cycle via the Marquardt method;and then the age reduction factor of equipment preventive maintenance is introduced for revealing the dynamic change of failure rate with equipment preventive maintenance in a life cycle;and finally,with the life cycle cost(LCC) model and annuity value method,the optimum life cycle of the selected type of transformer is assessed.