Abstract
AbstractTheoretically, the sensitivity of the transfer function (TF) method to detect transformer winding deformation is greater in the higher frequency range. Although measurement based on low voltage impulse (LVI) is definitely faster than that based on swept frequency method (SFM), the analyzable frequency band is narrow due to the typical microsecond impulse. The characteristics of the nanosecond impulse in the frequency domain were studied in this paper. A test System based on Nanosecond low voltage impulse was developed to improve the detection sensitivity. A series experiments were carried out on a 5 kV/100 kVA distribution transformer. Measurement results with two different impulses were compared and de-noising methods were studied. Besides, a destructive experiment was carried out on an special laboratory winding to verify the sensitivity of the method.KeywordsMonitoringWinding deformationTransfer functionNanosecond pulses
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