System And Method For Off-line Impulse Frequency Response Analysis Test

Abstract

The winding testing unit provides a system and method for determining a characteristic signature of a winding residing in a device, such as a transformer or generator. A pulse/signal generator applies a suitable number of non-precise and non-identical pulses to the winding. A sensor detects output pulses after each applied input pulse has propagated through the winding. Data corresponding to the applied input and the detected output pulses are stored as data pairs in a memory. The processor executes logic to compute the auto-spectral density (Gxx) and the cross-spectral density (Gxy) for the data pairs. The logic then computes the characteristic signature, H(f), for the winding such that H(f) equals the average of Gxy divided by the average of Gxx for the data pairs. Comparison of the characteristic signatures over a period of time indicates winding deformation or displacement during the time period.