Effect of Frequency on Eddy Losses of Transformers
Transformer is a vital component of electrical power systems for transmission and distribution. Robust design to increase the efficiency of a transformer is one of the main factors in transformer manufacturing. The efficiency of a practical transformer is limited by the losses caused by design and manufacturing defects. Losses in transformers can be divided into idle losses and losses under load. Eddy current loss is obtained from the idle losses of the transformer. In this paper, the effect of eddy effect causing HV energy loss at high magnetization frequencies was investigated. ANSYS@Maxwell software based on the Finite Element Method was used to analyze the eddy current loss in a T-connected, 3-leg and 3-phase distribution transformer of 15 MVA. The losses are obtained from no-load tests by changing the operating frequency of the transformer. Depending on the frequency value in the range of 50-60 Hz, the change in eddy current loss has been observed while the transformer winding is excitation at 1.74 T magnetic flux density. It has been observed that increasing the frequency causes an increase in the no load loss in the 3-phase transformer.
Keywords:
transformer, eddy effect FEm,
___
- [1] Özüpak Y, MAMIS M. S, Realization of electromagnetic flux and thermal analyses of transformers by finite element method. IEEJ Transactions on Electrical and Electronic Engineering, 14(10), 1478-1484. Doi: 10.1002/tee.22966, 2019.
- [2] Morched A., Marti L., Ottevangers J., “A high frequency transformer model for the EMTP”, IEEE Transactions on Power Delivery, Vol. 8, no. 3, s. 1615-1626, 1993.
- [3] Özüpak Y, MAMIS M. S, TEKE İ. H 2019 Electromagnetic Field and Total Loss Analysis of Transformers by Finite Element Method. International Journal of Engineering And Computer Science, 8(1), 24451-24460. (Yayın No: 5774086)..
- [4] Özüpak Y, MAMIS M. S 2019 Realization of electromagnetic flux and thermal analyses of transformers by finite element method. IEEJ Transactions on Electrical and Electronic Engineering, 14(10), 1478-1484. Doi: 10.1002/tee.22966.
- [5] Subedi D., Lightning Induced Over-voltages in Power Transformer and Voltage Spikes in Connected Load, Master Tezi, Aalto University, Helsinki, Finlandiya, 2017
- [6] Shirvani A., Malekian K., Schmidt U., ve Schufft W., “A New Power transformer Model Over Wide Frequency range for EMTP”, 45th International Universities Power Engineering Conference UPEC2010, 2010, s. 1-6.
- [7] Sabiha N. A., Lightning-Induced Overvoltages in Mediumvoltage Distribution Systems and Customer Experienced Voltage Spikes, Doktora Tezi, Aalto University, Helsinki, Finlandiya, 2010.
- [8] Shareghi M, Phung B. T, Naderi M. S, Blackburn T. R, Ambikairajah E 2012 Effects of current and voltage harmonics on distribution transformer losses, International Conference on Condition Monitoring and Diagnosis (CMD), pp.633-636,
- [9] Soh T. L. G, Said D. M, Ahmad N, Nor K. M, Salim F 2013 Experimental study on the impact of harmonics on transformer”, IEEE 7th International Power Engineering and Optimization Conference (PEOCO), pp.686-690.
- Başlangıç: 2009
- Yayıncı: Akdeniz Üniversitesi