Chapter 9 - Hyperbolic method

Abstract

Detecting mechanical defects in the transformer windings was assessed in previous chapters using the movement of the antennas and image processing. There are still a lot of obstacles to implement in the real environment due to the need for the movement of the antenna, despite the proposal of installing a dielectric window. Utilizing static ultra wideband antennas is investigated in this chapter for three main monitoring stages, including detection, location, and, determination of radial deformation (RD) and axial displacement (AD) extents. To this aim, defect detection is performed by calculating the subtraction of input signals, which are first studied by simulations. Then, the efficiency of the method in monitoring RD and AD is demonstrated by the experimental results on an actual transformer winding. Finally, the effect of electromagnetic interactions deriving from partial discharge while applying the proposed method is evaluated, and the solution to reduce the interactions is examined.