Title :
Calculation of core hot-spot temperature in power and distribution transformers
Author :
TeNyenhuis, Ed G. ; Girgis, Ramsis S. ; Mechler, Günther F. ; Zhou, Gang
Author_Institution :
ABB Power Transformers, Guelph, Ont., Canada
Abstract :
Summary form only given, as follows. Accurate calculation of the value of the core hot-spot temperature at the design stage is becoming very critical in order to ensure that hydrogen generation that can be caused by oil-film degradation at core hot-spot temperatures as low as 110-120°C is limited. Presented are two calculation methods developed for this purpose. Results of the FEM calculation of the location and value of the hot spot temperature in cores of 3-phase, 3-limb cores of power & distribution transformers show excellent agreement with tested values on a number of transformers. Insight learnt from this analysis was used to enhance a previously available empirical method. This simplified calculation method is appropriate for everyday use and, hence, is suitable for design calculations. This method was shown to have again very good accuracy in the range of 2°C for most of the cases. The simplified calculation method was also shown to provide a much greater accuracy than the original empirical method.
Keywords :
distribution networks; finite element analysis; power transformers; temperature distribution; thermal analysis; transformer cores; 110 to 120 C; 3-phase 3-limb transformer cores; FEM calculation; core hot-spot temperature calculation; design calculations; hydrogen generation; oil-film degradation; power distribution transformers; Degradation; Hydrogen; Power transformers; Temperature distribution; Testing; Transformer cores; USA Councils;
Conference_Titel :
Power Engineering Society Summer Meeting, 2002 IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-7518-1
DOI :
10.1109/PESS.2002.1043282