  In this paper, a novel method for detecting transformer winding axial
displacement has been presented. In this method, which is based on UWB radar
imaging, a UWB pulse is transmitted to the transformer winding and the
reflection from it is received and recorded. By changing the antenna position
this process is repeated on several points along the axis of the winding. The
measured signals are mapped to a 2-D image of the winding. By analyzing this
image, the axial displacement of the winding can detected and the magnitude of
it is determined with an acceptable precision. Simulation results are provided
to verify the proposed method.
