It is conducive to increasing transformer capacity to help relieve the long-term contradiction between power supply and demand and the short-term emergency demand. In existing studies

transformer capacity increasing(TCI)decision is based on the hottest spot temperature(HST)and failure rate(FR). In consideration of operation risks

a short-term TCI method including two stages is proposed. Firstly

a preliminary TCI decision constrained by HST and FR is generated. Then

the economically optimal TCI decision between the preliminary TCI decision and full-loaded operation is searched for as the final decision on the basis of economic risk verification according to profit and loss of power enterprises and community. In a case study

the influence of transformer service time and planned TCI time on the short-term TCI results is discussed. And the proposed method is compared with the current TCI plan of power enterprises. The results show that the short-term TCI plan can be made flexibly with the proposed method that attends to both security and economy.