Black-Box Power Transformer Winding Model

In the paper high-frequency black-box model of a power transformer winding is presented. The model is based on high-frequency measurements of the winding admittance matrix, using commercial VNA equipment. The winding admittance matrix is measured for every two discs of the winding. The state-space winding model is created using the vector fitting method. The model is verified in the time domain for different voltage impulses and connections.