Temperature rise simulation of individual transformer and the cooling effect by the summary cooler equipment

摘要

In resent years, Substations are apt to be built in underground or surrounded by anti-noise fence inurban areas. Consequently the temperature of the cooling materials (insulation oil or SF{sub}6 gas) inthe transformers rises more than the regulated value (75℃), especially on dog days in summer. Thenthe estimated life-time of the transformer (almost 30 years) will be on the verge of danger. To prevent this phenomena, summary cooler or auxiliary cooler applying water evaporative beator sensible beat for the transformer should be developed and used systematically with main cooler.This thesis describes the mathematical models of the temperature rise of the transformer and compare the calculated value with the field data, then prove the accuracy and the adequacy of the simulation (calculation).After the proof that the simulation is effective for temperature analyses, bow much down the temperature of the transformer will be evaluated when summary cooler or auxiliary cooler is operated.