Jayarathna, KLIMPBEdiriweera, WEPSSamarasinghe, R.Lucas, JRSamarasinghe, RAbeygunawardana, S2022-03-312022-03-312018-09Jayarathna, K.L.I.M.P.B., Ediriweera, W.E.P.S., Samarasinghe, R., & Lucas, J.R. (2018). An improved wide frequency model for VFTO of power transformers using transfer functions. In R. Samarasinghe & S. Abeygunawardana (Eds.), Proceedings of 2nd International Conference on Electrical Engineering 2018 (pp. 81-86). Institute of Electrical and Electronics Engineers, Inc. https://ieeexplore.ieee.org/xpl/conhome/8528200/proceedinghttp://dl.lib.uom.lk/handle/123/17535An accurate understanding of power transformer high frequency behavior is very important to assess the impacts on power system due to transient over-voltage conditions. An improved method of modeling power transformer under very fast transient over-voltage conditions (VFTO) is presented in this paper that provides a convenient way of obtaining winding and core responses of power transformers using existing circuit synthesis method. End-to-end short circuit and open circuit sweep frequency response analysis data are converted into transfer functions using a novel algorithm based on Levy and Sanathanan- Koerner methods, that are used in the development of lumped circuit model later. These transformer models can be implemented in a transient analysis software and can be used in power system analyzing under VFTO with greater accuracy.enPower transformerVFTOTransfer functionSFRANetwork synthesisTransformer modellingConference-Full-textEngineeringDepartment of Electrical Engineering20182nd International Conference on Electrical Engineering 2018Colombopp. 81-86Proceedings of 2nd International Conference on Electrical Engineering 2018pramodjayarathna@gmail.comsampath ediriweera@yahoo.comrasara@elect.mrt.ac.lklucas@elect.mrt.ac.lk