229 results about "Life cycle costs" patented technology

The invention discloses a method for evaluating the economic operation year range of a transformer substation. According to an original fault rate model based on Weibull distribution or index distribution, only the service age is taken as the variable, various other factors influencing the fault rate of the transformer substation are not considered, and thus the original fault rate model is not suitable for being taken as a model for predicting the fault rate of the transformer substation. According to the method for evaluating the economic operation year range of the transformer substation, the transformer substation is evaluated comprehensively in the aspects of the operating environment and the quality condition, the influence of the two factors on the defect-level fault rate, the invalid-level fault rate and the accident-level fault rate of the transformer substation is analyzed by means of a least square support vector machine under the condition that the different operating times of the transformer substation are considered, the annual maintenance cost range and the fault cost range of the transformer substation under the conditions of the three types of fault rates are obtained by combining the interval analysis method and the whole life cycle cost theory, and finally the operating year range in which the annual average cost of the transformer substation is lowest is taken as the economic operation year range of the transformer substation. The method can provide beneficial guidance for decisions such as power grid planning and transformer substation transformation.