A new on-line monitoring method of transformer winding axial displacement based on measurement of scattering parameters and decision tree

In this paper the scattering parameter of a simplified model of transformer has been measured in different axial displacement of the winding using a Network Analyzer. Two indices have been suggested to detect the axial displacement. The measurement results show the effectiveness of these indices. A new method of the detection of the axial displacement extent based on decision tree (DT) has been proposed, too. It has been shown that this method has a good accuracy to determine the displacement of the winding and its extent.