Temperature Rise Analysis Based on Full Load at Three Sides of Transformer

摘要

The power transformer is one of the most important equipment in power net, the analysis and research for temperature rise on full load at three sides of transformer can make a good precaution for the safe operation of power transformer. For the special cases of load feature or reactive load compensation equipment being added to the low voltage side, the transformer can be reached full load operation on three sides, so the temperature rise can over standard limitation very seriously if designer ignores it. The designer should pay more attention to customer’s requirement that transformer operates full load on three sides and can not design it as usual as for two winding combination. During the design, not only the limitation of temperature rise of top oil , winding gradient and average temperature rise of oil, but also the temperature rise on hottest spot of winding shall be taken into consideration. if the designer ignores the situation that three sides on full load simultaneously and gives a value close to the limitation only considering the situation of two-winding combination, the actual temperature rise when the transformer is in operation with three sides on full load will much over the standard limit. The result of overheating of transformer is very seriously dangerous, only when all values of temperature rise are lower the standard limits, the long-term safe operation of transformer can be ensured. Therefore, the temperature rise analysis based on full load at three sides of transformer by author is very important and meaningful.