Abstract:In this paper, the whole life cycle cost of transformer equipment is studied by an example of 500kV power transformer in an old transformer substation that has been running for nearly 25 years, based on the data of the substation operation for many years, the station of the main transformer materials, performance, operation condition is analyzed, combining with the manufacturing process of 20 years ago, level and technical ability, consider including the initial investment cost, operation cost and maintenance cost, fault and decommissioning disposal cost, The total life cycle cost of 500kV main transformer in a substation is evaluated comprehensively, Through the analysis and comparison of the two quality level products of the joint venture brand and the domestic high-quality brand by the power transformer, it is concluded that the purchase cost of the equipment plays a leading role in the control of LCC, In the case that the cost of overhaul and maintenance, the cost of failure and the cost of decommission-disposal are relatively small, the purchase cost of the high equipment of the joint venture brand is not conducive to the control of cost, The whole life cycle cost of domestic high quality brand products is relatively superior.