As the hinge facility in power system

the operating condition of power transformer will influence the reliability of power system directly. So it is very important to assess the operating condition of power transformer and then to take the scientific and reasonable maintaining strategies. Aiming at the problem of the multi-table power transformer condition assessment

a new evaluation method is put forward. Firstly

the power transformer condition evaluation index is established

and the index weight of the power transformer condition evaluation index is determined by the method of IAHP. Power transformer condition assessment model based on interval number TOPSIS method is established by combining the interval number and TOPSIS method. Finally

the conditions of the8 transformers are evaluated based on the relevant data. The results show that the model is reasonable and effective.