Title :
Effect of harmonics on transformers loss of life
Author :
Elmoudi, A. ; Lehtonen, M. ; Nordman, Hasse
Author_Institution :
Power Syst. & HV Eng., Helsinki Univ. of Tech., Espoo
Abstract :
The use of non-linear (solid state) loads in power system has increased the awareness of the potential reduction of a transformer life due to the increased losses. Manufacturers and users have been applying IEEE C57.110-1989 which gives a conservative estimate of loading capability of transformers. In this paper, the effect of harmonics on transformers is discussed and a thermal model to predict a transformer hot spot temperature is presented. The model considers a time varying harmonic load cycle and ambient temperature. The model is applied on 31.5 MVA, 115times9times1.67%/6.3 kV ONAF transformer
Keywords :
IEEE standards; harmonics; losses; power transformers; thermal analysis; 31.5 MVA; 6.3 kV; IEEE C57.110-1989; ONAF transformer life; harmonics effect; hot spot temperature prediction; losses; nonlinear load; thermal model; time varying harmonic load; Eddy current testing; Eddy currents; Frequency estimation; Impedance; Power engineering and energy; Power system harmonics; Skin effect; Solid state circuits; Temperature; Transformers;
Conference_Titel :
Electrical Insulation, 2006. Conference Record of the 2006 IEEE International Symposium on
Conference_Location :
Toronto, Ont.
Print_ISBN :
1-4244-0333-2
DOI :
10.1109/ELINSL.2006.1665344
