The invention relates to a 
dynamic capacity increasing method for an oil-immersed 
transformer, and belongs to the field of transformers. The method includes the steps that heat conduction process in the 
transformer is simplified into a circuit model; winding hot-spot temperature, top 
oil temperature, average 
oil temperature, average winding temperature of the 
transformer under the 
current load condition are calculated; according to the limit that the winding hot-spot temperature does not exceed 140 DEG C, whether temperature in the transformer will exceed the limit temperature or not under the 
current load and environment conditions is calculated, whether a 
temperature limit value is reached or not if long-term emergency loads or short-term emergency loads occur at the moment is calculated, and if the temperature in the transformer possibly exceeds the 
limit value of the short-term emergency loads, the time for reaching the 
limit value and the finally reached 
steady state temperature are calculated to serve as alarm signals; if it is monitored that the temperature will exceed the standard within t minutes, an early-warning 
signal is sent out, certain time 
delay is set, and if the loads are not reduced within the set time 
delay, a cooling fan of the transformer is turned on. Long-term 
continuous operation of cooling equipment can be avoided, and operation life of the cooling equipment is prolonged.