Transformer Selection Research Based on Blind Number Theory

For a long time, the power company is always concerned about acquisition costs in power equipment selection and ignores the impact of operating costs on the selection decision. Thus, the selection model has a certain one-sidedness. In this paper, the life cycle costs theory is applied to the transformer selection, which consider transformer initial investment costs, operation and maintenance costs, technological overhaul costs, the cost of failure and scrap disposal costs in full life cycle more comprehensively. The result not only gives the transformer blind number expectations of full life cycle cost, but also can give the credibility of different costs interval and have a certain reference value.