Title :
High-Frequency Model of the Power Transformer Based on Frequency-Response Measurements
Author :
Filipovic-Grcic, Dalibor ; Filipovic-Grcic, Bozidar ; Uglesic, Ivo
Author_Institution :
Electr. Eng. Inst., KONCAR, Zagreb, Croatia
Abstract :
In this paper, a new high-frequency black-box model of the power transformer is presented for the calculation of transferred lightning overvoltages. The model is based on frequency-response analysis measurements and the application of four-terminal network theory. The computational verification of the presented model was successfully performed on a white-box transformer model in Electromagnetic Transients Program-Restructured Version software. The experimental verification was carried out on 130-kVA and 36-MVA three-phase power transformers. The presented calculation and measurement results confirm the validity of the proposed model for full and chopped lightning impulse voltages.
Keywords :
EMTP; frequency response; lightning; modelling; overvoltage; power transformers; electromagnetic transients program-restructured version software; four-terminal network theory; frequency-response analysis measurement; high-frequency black-box model; high-frequency transferred lightning overvoltage; lightning impulse voltage; three-phase power transformer; white-box transformer model; Frequency measurement; Lightning; Power transformer insulation; Surges; Voltage measurement; Windings; Fast Fourier transform (FFT); four-terminal network; frequency-response measurements; high-frequency transformer model; transfer function; transferred lightning overvoltages;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2014.2327061
