System And Method For On-line Impulse Frequency Response Analysis

Abstract

The on-line winding test unit determines a characteristic signature of a monitored winding(s) in a transformer, generator, or the like. A sensor detects incoming pulses, originating elsewhere on the energy delivery system, applied to the winding. A sensor detects output pulses after each input pulse has propagated through the winding. Data corresponding to the input and output pulses are stored. A processor computes the spectral densities of the data records. 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 valid data. Coherence is used to determine a valid H(f). A comparison of the H(f)'s over elapsed time using an error function indicates winding deformation or displacement.