Modelling, Simulation and Measurements of Very Fast Transients in Lossy Transformer Windings with Tap Changer

摘要

In this paper, a detailed modelling methodology for simulating the internal very fast transient voltage distribution in any complex winding arrangement encountered in large power transformers is presented. The proposed model is based on RLCG lumped frequency-dependent parameters taking into account different combinations of windings such as including the presence of the tap charger. The numerical Laplace transform and modal analysis are applied for carrying out the time solutions. Measurements were carried out and compared with simulation results.