Evaluation of Vector Fitting Methodology on Distribution Transformers Modelling Based on Lightning Impulse Test Results

This paper aims to develop and validate black-box models for distribution transformers using the vector fitting methodology on Frequency Response Analysis (FRA) results. Thirteen single-phase distribution transformers were evaluated using the FRA. The black-box models obtained by vector fitting were firstly validated on frequency domain through FRA tests. Afterwards, Alternative Transients Program (ATP) simulations were used to compare the model response on time domain - where the transformer models are submitted to the standard lightning impulse shape - with actual recordings of lightning impulse tests on LAT-EFEI High Voltage Laboratory.