Asset Management for Power Transformer in High Voltage Substation 9 Asset Management for Power Transformer in High Voltage Substation

In this paper, an innovative asset management in inventory control of power transformer in high volt-age substation is proposed. Using Pareto analysis, the components of power transformer are classified into ABC Classes. Class A means the few most ex-pensive ones that need special care. Class B means ordinary ones that need standard care. Class C means the large number of cheap items that need little care. The inventory management strategies as statistical distribution methods, economic ordering policy, and two-bin policy are initiatively applied to the trans-former components in the ABC Classes. Finally, the optimum number of spare parts, the optimum order-ing quantity, the suitable time for reordering, and the saving inventory cost are determined in order to mini-mize the total inventory cost. The power transformer fleet in Thailand is presented as example of inventory control of transmission asset