Economic Analysis for Utilizing the Old Transformers in the Reconstruction Engineering

Zhai Xiling（China Railway 21st Bureau Group Electrical Engineering Co.，Ltd.，Lanzhou 730000，China）

Abstract By using the theory of economic life and the annual average use cost，through the economic analysis for use of the existing transformers removed in the technical reconstruction engineering，it is proposed that whether to adopt the removed available equipments should be decided in accordance with the economic life and annual use cost of the equipments；it should be both economizing the initial investment and reducing operating cost，which minimizes the life cycle cost of the project.

Key words　Reconstruction engineering　Old transformer utilization 　Economic life 　Annual use cost

摘　要　利用经济寿命及年平均使用成本的理论，通过对技改工程中拆除的既有变压器利用的经济性进行分析，提出是否采用拆除的可利用设备，应根据设备的经济寿命及年使用成本进行决策，既要节省初期投资，又要降低运营费用，从而使工程的全寿命费用达到最低。

关键词　改建工程　变压器利旧　经济寿命　年使用成本